Dynamic Floor Pricing for Managing Exchange Monetization

Systems and method are provided for conducting an auction to match an advertising payload to an available advertising impression. In the auction, a dynamic floor price is provided. The dynamic floor price provides a way for a publisher to incorporate the internal value of the available impression into the auction process, while still allowing the publisher to maximize the value of the available impression by exposing the impression to bids from outside parties. The dynamic floor price can be calculated based on both internal valuations of an available impression as well as external valuations derived from feedback from prior auctions. To facilitate determination of a dynamic floor prices, advertisers and available impressions can be categorized into various segments. 1. A computer-implemented method for matching an advertising payload with an available impression , comprising:selecting a hosted advertisement that corresponds to an available impression, the hosted advertisement having an assigned user segment, the assigned user segment being associated with first floor price information;assigning an inventory segment to the available impression, the assigned inventory segment being associated with second floor price information;determining a floor price based on the first floor price information and the second floor price information;forwarding information related to the available impression, bid information for the selected hosted advertisement, and the determined floor price to an auction marketplace;transmitting an advertising payload in response to the available impression, the advertising payload corresponding to at least one of the selected hosted advertisement or a payload associated with a winning bid from an auction corresponding to the available impression;receiving auction bid information, from the auction marketplace, related to the auction corresponding to the available impression; andupdating at least one of the first floor price information or the ...

Method for determining fast charge performance of a negative electrode plate and method for designing a negative electrode plate

The present application provides a method for determining fast charge performance of a negative electrode plate and a method for designing a negative electrode plate. By utilizing the method(s) according to the present application, the charging speed of a negative electrode plate can be quickly evaluated and the design period of a negative electrode plate in a fast charge battery can be greatly shortened.

SECONDARY BATTERY, PROCESS FOR PREPARING THE SAME AND APPARATUS CONTAINING THE SECONDARY BATTERY

The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. Particularly, the secondary battery comprises a negative electrode plate, wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode film, and the negative electrode film comprises a first negative electrode film and a second negative electrode film; the first negative electrode film is disposed on at least one surface of the negative electrode current collector and comprises a first negative electrode active material; and the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material; the first and second negative electrode active materials both comprise artificial graphite; the first negative electrode active material comprises primary particles, and a number percentage of the primary particles in the first negative electrode active material A satisfies A≥50%. 1. A secondary battery , comprising a negative electrode plate , wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode film , and the negative electrode film comprises a first negative electrode film and a second negative electrode film;the first negative electrode film is disposed on at least one surface of the negative electrode current collector and comprises a first negative electrode active material;the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material;the first negative electrode active material and the second negative electrode active material both comprise artificial graphite; andthe first negative electrode active material comprises primary particles, and a number percentage of the primary particles in the first negative electrode active material A satisfies A≥50%.2. The secondary battery ...

NEGATIVE ELECTRODE ACTIVE MATERIAL, METHOD FOR PREPARING SAME, SECONDARY BATTERY AND APPARATUS INCLUDING THE SECONDARY BATTERY

The present application discloses a negative electrode active material and a method for preparing the same, a secondary battery, and an apparatus including the secondary battery. The negative electrode active material includes a core and a coating layer covering the surface of the core, the core includes artificial graphite, the coating layer includes amorphous carbon, and the particle size uniformity of the negative electrode active material is from 0.25 to 0.45. 1. A negative electrode active material , comprising a core and a coating layer covering a surface of the core , wherein the core comprises artificial graphite , the coating layer comprises amorphous carbon , and the negative electrode active material has a particle size uniformity of from 0.25 to 0.45.2. The negative electrode active material according to claim 1 , wherein the particle size uniformity of the negative electrode active material is from 0.3 to 0.4 claim 1 , and preferably from 0.31 to 0.38.3. The negative electrode active material according to claim 1 , wherein the negative electrode active material has a particle size specific surface area of from 0.3 m/g to 0.65 m/g claim 1 , and preferably from 0.4 m/g to 0.55 m/g.4. The negative electrode active material according to claim 1 , wherein the negative electrode active material satisfies 0.8≤(D90−D10)/D50≤1.6 claim 1 , and preferably 0.9≤(D90−D10)/D50≤1.4.5. The negative electrode active material according to claim 1 , wherein the negative electrode active material comprises secondary particles claim 1 , and wherein the secondary particles have a number proportion of ≥30% in the negative electrode active material claim 1 , and preferably claim 1 , the secondary particles have a number proportion of ≥50% in the negative electrode active material.6. The negative electrode active material according to claim 1 , wherein the negative electrode active material further satisfies one or more of the following conditions from (1) to (5):{'sub': ['v', ' ...

SECONDARY BATTERY AND APPARATUS CONTAINING THE SAME

This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery secondary battery includes an electrode assembly including a cell and tabs extending from the cell, the cell includes a negative electrode plate, the negative electrode plate includes a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and including a negative active material, wherein the negative active material includes artificial graphite including secondary particles; and the cell satisfies 5 cm≤0.5×√{square root over (a+b)}≤15 cm, and a≤15 cm, wherein a is the maximum size of the cell in the direction that the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction that the tabs extend, in cm. 1. A secondary battery , comprising an electrode assembly which comprisesa cell and tabs extending from the cell, the cell comprising a negative electrode plate, the negative electrode plate comprising a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and comprising a negative active material,wherein the negative active material comprises artificial graphite comprising secondary particles; and{'sup': 2', '2, 'the cell satisfies 5 cm≤0.5×√{square root over (ab)}≤15 cm, and a≤15 cm, where a is the maximum size of the cell in the direction in which the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction in which the tabs extend, in cm.'}2. The secondary battery according to claim 1 , wherein number percentage S of the secondary particles in the artificial graphite satisfies S≥30% claim 1 , and preferably 50%≤S≤80%.3. The secondary battery according to claim 1 , wherein the cell satisfies 7 cm≤0.5×√{square root over (a+b)}≤15 cm claim 1 , and Preferably 9 cm≤0.5×√{square root ...

Negative electrode active material and method for preparation thereof, secondary battery, and apparatus including secondary battery

Secondary battery and preparation method thereof, and battery module, battery pack, and apparatus containing such secondary battery

Embodiments provide a secondary battery and a preparation method thereof, and a battery module, battery pack, and apparatus containing such secondary battery. In those embodiments, a negative electrode plate includes a negative-electrode current collector and a negative-electrode film layer that is disposed on at least one surface of the negative-electrode current collector and that includes a negative-electrode active material. The negative-electrode active material contains graphite, and the negative electrode plate satisfies that, when the negative electrode plate and a lithium metal sheet constitute a button battery which is discharged to 5.0 mV at 0.05 C, a capacity increment curve V-dQ/dV of the button battery has a third-order lithiation phase transition peak of graphite at position 0.055V-0.085V.

Secondary battery, preparation method therefor, and battery module, battery package and device containing same

Disclosed are a secondary battery, a preparation method therefor, and a battery module, a battery pack and a device containing same. A negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer provided on at least one surface of the negative electrode current collector and containing a negative electrode active material. The negative electrode active material includes graphite. The negative electrode sheet satisfies the following conditions: when the negative electrode sheet and a lithium metal sheet form a button cell, and the button cell is discharged to 5.0 mV at 0.05 C, a capacity increment curve V-dQ/dV thereof has a graphite third-order lithium intercalation phase transition peak at a position of 0.055V to 0.085V.

Secondary battery and manufacturing method therefor, and apparatus comprising secondary battery

Negative electrode active material and method for preparation thereof, secondary battery, and apparatus including secondary battery

The present application discloses a negative electrode active material and a method for preparation thereof, a secondary battery, and an apparatus including the secondary battery. The negative electrode active material includes a core and a coating layer covering a surface of the core, the core includes artificial graphite, the coating layer includes amorphous carbon, the negative electrode active material has a surface area average particle size D(3,2) denoted as A, the negative electrode active material has a surface area average particle size D(3,2) denoted as B after powder compaction under a pressure of 20 kN, and the negative electrode active material satisfies: 72%≤B/A×100%≤82%.

Bateria wtórna, sposób jej wytwarzania i urządzenie zawierające baterię wtórną

Batería secundaria, proceso de preparación de la misma y aparato que contiene la batería secundaria

Se divulgan una batería secundaria y un método para prepararla, y un dispositivo que incluye la batería secundaria. Específicamente, la batería secundaria de la presente solicitud comprende una pieza polar negativa, en donde la pieza polar negativa comprende un colector de corriente negativo y una capa de diafragma negativa. La capa de diafragma negativo comprende una primera capa de diafragma negativo y una segunda capa de diafragma negativo, en donde la primera capa de diafragma negativo está dispuesta en al menos una superficie del colector de corriente negativo y comprende un primer material activo negativo, y la segunda capa de diafragma negativo está dispuesto sobre la primera capa de diafragma negativo y comprende un segundo material activo negativo. Tanto el primer material activo negativo como el segundo material activo negativo comprenden grafito artificial; y el primer material activo negativo comprende partículas primarias, y la proporción A de la cantidad de partículas primarias en el primer material activo negativo cumple el requisito: A >= 50%. La batería secundaria tiene características tales como una buena propiedad de carga rápida y un ciclo de vida prolongado. (Traducción automática con Google Translate, sin valor legal)

Secondary battery, process for preparing the same and apparatus containing the secondary battery

Secondary battery and method for preparing same, and device including secondary battery

This application relates to a secondary battery (5), a process for preparing the same and an apparatus containing the secondary battery (5). In particular, the negative electrode plate (10) comprises a negative current collector (101) and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film (103) and a second negative electrode film (102), the first negative electrode film (103) is disposed on at least one surface of the negative current collector (101) and comprises a first negative electrode active material, the first negative electrode active material comprises graphite, and the particle size uniformity of the first negative electrode active material is from 0.4 to 0.6; the second negative electrode film (102) is disposed on the first negative electrode film (103) and comprises a second negative electrode active material, the second negative electrode active material comprises artificial graphite, and the particle size uniformity of the second negative electrode active material is from 0.25 to 0.45. Secondary battery (5) has high energy density and good quick charging performance and cycle performance.

Bateria wtórna, sposób jej wytwarzania i urządzenie zawierające baterię wtórną

Secondary battery and apparatus including the secondary battery

This application relates to a secondary battery and an apparatus including the secondary battery. Specifically, the secondary battery of this application includes a negative electrode plate, where the negative electrode plate includes a negative current collector and negative film layers where the negative film layers include a first negative film layer and a second negative film layer, the first negative film layer is disposed on at least one surface of the negative current collector and includes a first negative active material, and the second negative film layer is disposed on the first negative film layer and includes a second negative active material; the first negative active material includes natural graphite, and the second negative active material includes artificial graphite; the first negative active material satisfies 4.0≤COI1≤7.0; and the second negative active material satisfies 2.2≤COI2≤4.2.

Secondary battery and preparation method therefor, battery module, battery pack, and electric device

A secondary battery (5) is provided, including a positive electrode plate and a negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer provided on two surfaces of the positive electrode current collector, the negative electrode plate includes a negative electrode current collector and a negative electrode film layer provided on two surfaces of the negative electrode current collector, and the negative electrode film layer includes a reaction zone opposite the positive electrode film layer and a non-reaction zone not opposite the positive electrode film layer, where a lithium supplement layer and a barrier layer are provided on the non-reaction zone. A preparation method of secondary battery (5), a battery module (4), a battery pack (1), and an electric apparatus are also provided.

Negative electrode active material, method for preparing same, secondary battery and apparatus including the secondary battery

The present application discloses a negative electrode active material and a method for preparing the same, a secondary battery, and an apparatus including the secondary battery. The negative electrode active material includes a core and a coating layer covering the surface of the core, the core includes artificial graphite, the coating layer includes amorphous carbon, and the particle size uniformity of the negative electrode active material is from 0.25 to 0.45.

Negative electrode plate and preparation method therefor, secondary battery, battery module, battery pack and electric device

Provided is a negative electrode plate, comprising: a negative electrode current collector and a first negative electrode active material layer. The first negative electrode active material layer is arranged on at least one surface of the negative electrode current collector, wherein, components of the first negative electrode active material layer comprise, by mass: 30%-70% of a silicon-based material, 15%-40% of a binder and 15%-40% of a conductive agent.

Secondary battery and device comprising secondary battery

This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery secondary battery includes an electrode assembly including a cell and tabs extending from the cell, the cell includes a negative electrode plate, the negative electrode plate includes a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and including a negative active material, wherein the negative active material includes artificial graphite including secondary particles; and the cell satisfies 5cm≤0.5×a2+b2≤15cm, and a ≤ 15cm, wherein a is the maximum size of the cell in the direction that the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction that the tabs extend, in cm.

Secondary battery, process for preparing the same and apparatus containing the secondary battery

The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. Particularly, the secondary battery comprises a negative electrode plate, wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode film, and the negative electrode film comprises a first negative electrode film and a second negative electrode film; the first negative electrode film is disposed on at least one surface of the negative electrode current collector and comprises a first negative electrode active material; and the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material; the first and second negative electrode active materials both comprise artificial graphite; the first negative electrode active material comprises primary particles, and a number percentage of the primary particles in the first negative electrode active material A satisfies A≥50%.

Phase-change temperature control material compounded from hybrid fibers and preparation method thereof

The present invention provides a phase-change temperature control material compounded from 5 hybrid fibers and a preparation method thereof The material comprises the following raw materials by mass percentage: 20% to 40% of plant fiber pulp, 6% to 10% of an inorganic fiber, 30% to 50% of a phase-change energy storage agent, 2% to 15% of a phase-charge temperature regulator, 1% to 10% of a nucleating agent, 2% to 8% of a thickening stabilizer and 0.5% to 5% of a preservative. In the present invention, a fiber network is constructed by using the plant fiber pulp 10 and the inorganic fiber, so that supercooling of the phase change agent is relieved, the cycle performance of the temperature control material is improved, and usage of the inorganic fiber is also reduced. Accordingly, the production cost of the material is reduced, and fibers in agricultural and forestal wastes and waste paper are effectively utilized. Moreover, the present invention is simple in production process and good in temperature control effect, can be widely applied in the 15 fields of building energy conservation and electronic device temperature control, and has great economic and social benefits.

Secondary battery, preparation method therefor, and battery module, battery package and device containing same

Secondary battery, process for preparing the same and apparatus containing the secondary battery

Secondary battery and preparation method therefor, and battery module, battery pack and electric apparatus

This application relates to a secondary battery including a positive electrode plate and a negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer provided on each of two surfaces of the positive electrode current collector, the negative electrode plate includes a negative electrode current collector and a negative electrode film layer provided on each of two surfaces of the negative electrode current collector, and the negative electrode film layer includes a reaction zone opposite the positive electrode film layer and a non-reaction zone not opposite the positive electrode film layer, where a barrier layer is provided on a surface of the non-reaction zone. This application also relates to a preparation method of secondary battery, a battery module, a battery pack, and an electric apparatus.

Secondary battery and device comprising secondary battery

This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery secondary battery includes an electrode assembly including a cell and tabs extending from the cell, the cell includes a negative electrode plate, the negative electrode plate includes a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and including a negative active material, wherein the negative active material includes artificial graphite including secondary particles; and the cell satisfies 5 cm ≤ 0.5 × a 2 + b 2 ≤ 15 cm , and a ≤ 15cm, wherein a is the maximum size of the cell in the direction that the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction that the tabs extend, in cm.

Secondary battery and preparation method thereof, battery module, battery pack, and electric apparatus

A secondary battery is provided, including a positive electrode plate and a negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer provided on two surfaces of the positive electrode current collector, the negative electrode plate includes a negative electrode current collector and a negative electrode film layer provided on two surfaces of the negative electrode current collector, and the negative electrode film layer includes a reaction zone opposite the positive electrode film layer and a non-reaction zone not opposite the positive electrode film layer, where a lithium supplement layer and a barrier layer are provided on the non-reaction zone. A preparation method of secondary battery, a battery module, a battery pack, and an electric apparatus are also provided.

Negative electrode plate and preparation method thereof, secondary battery, battery module, battery pack, and electrical apparatus

Provided is a negative electrode plate, comprising: a negative electrode current collector and a first negative electrode active material layer. The first negative electrode active material layer is arranged on at least one surface of the negative electrode current collector, wherein, components of the first negative electrode active material layer comprise, by mass: 30%-70% of a silicon-based material, 15%-40% of a binder and 15%-40% of a conductive agent.

Batería secundaria, proceso de preparación de la misma y aparato que contiene la batería secundaria

Se proporcionan una batería secundaria (5) y un método para prepararla, y un dispositivo que incluye la batería secundaria (5). Una pieza de polo negativo (10) de la batería secundaria (5) comprende un colector de corriente negativo (101) y una capa de diafragma negativo, en donde la capa de diafragma negativo comprende una primera capa de diafragma negativo (103) y una segunda capa de diafragma negativo (102).). La primera capa de diafragma negativo (103) está dispuesta en al menos una superficie del colector de corriente negativo (101) y comprende un primer material activo negativo, en donde el primer material activo negativo comprende grafito, y la uniformidad del tamaño de partícula del primer material activo negativo El material es 0,4-0,6. La segunda capa de diafragma negativo (102) está dispuesta sobre la primera capa de diafragma negativo (103) y comprende un segundo material activo negativo, en donde el segundo material activo negativo comprende grafito artificial, y la uniformidad del tamaño de partícula del segundo material activo negativo es 0,25. -0,45. La batería secundaria (5) puede tener un buen rendimiento de carga rápida y un buen rendimiento de ciclo bajo la premisa de tener una mayor densidad de energía. (Traducción automática con Google Translate, sin valor legal)

Method for determining fast charge performance of a negative electrode plate and method for designing a negative electrode plate

Method, apparatus, electronic device, and readable storage medium for orchestrating microservices

Embodiments of the present invention disclose a method, apparatus, electronic device, and readable storage medium for orchestrating microservices. The method comprising: displaying a function node list in a visual interface of an integrated development environment, wherein the function node list comprising identifiers of a plurality of function nodes, and each function node in the plurality of function nodes is comprised in a respective microservice; determining identifiers of selected function nodes from the function node list based on a selection operation in the visual interface; determining an execution logic of the selected function nodes based on a connection operation in the visual interface; generating a microservice orchestration file based on the identifiers of the selected function nodes, the execution logic and identifier of a device, wherein the microservice comprising the selected function nodes is deployed in the device; executing the microservice orchestration file. The present invention builds orchestration rules in a user-friendly low-code manner, reduces the difficulty of orchestration, and facilitates implementation.

Artificial graphite and preparation method therefor, negative electrode plate, secondary battery, battery module, battery pack, and electrical device

Battery cell, battery, and electric apparatus

The present application provides a battery cell, a battery and an electric device. The battery cell includes a positive electrode plate and a negative electrode plate, the negative electrode plate includes a negative electrode current collector, a negative electrode active material layer arranged on at least one surface of the negative electrode current collector, and a lithium supplement layer, wherein the negative electrode active material layer includes a first portion and a second portion connected with the first portion, the first portion exceeds the positive electrode plate, the second portion is arranged corresponding to the positive electrode plate, and the lithium supplement layer is arranged on at least part of a surface of the first portion away from the negative electrode current collector. The negative electrode plate of the present application can improve the first Coulomb efficiency, cycle performance and storage performance of the battery cell.

Secondary battery, process for preparing the same and apparatus containing the secondary battery

The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. In particular, the secondary battery comprises a negative electrode plate, and the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is disposed on at least one surface of the negative current collector and comprises a first negative electrode active material, the first negative electrode active material comprises graphite; the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, the second negative electrode active material comprises artificial graphite, and the second negative electrode active material comprises secondary particles, the number percentage of which is greater than or equal to 20%.

Secondary battery, battery module comprising secondary battery, battery pack, and electric device

This application discloses a secondary battery and a battery module, battery pack, and electric apparatus containing such secondary battery. The secondary battery includes: a positive electrode plate including a positive electrode film layer; a separator; and a negative electrode plate. The negative electrode plate includes: a first negative electrode film layer, the first negative electrode film layer being provided opposite the positive electrode film layer with the separator therebetween; and a second negative electrode film layer, the second negative electrode film layer including a negative electrode film layer not provided opposite the positive electrode film layer, and the second negative electrode film layer including a central region and a peripheral region surrounding the central region, where a lithium source used for supplementing lithium to the first negative electrode film layer is stored in at least a portion of the peripheral region of the second negative electrode film layer.

Secondary battery and battery module, battery pack, and electric apparatus containing such secondary battery

Provided are a secondary battery and a battery module, battery pack, and electric apparatus containing such secondary battery. The secondary battery includes: a positive electrode plate including a positive electrode film layer; a separator; and a negative electrode plate. The negative electrode plate includes: a first negative electrode film layer, the first negative electrode film layer being provided opposite the positive electrode film layer with the separator therebetween; and a second negative electrode film layer, the second negative electrode film layer including a negative electrode film layer not provided opposite the positive electrode film layer, and the second negative electrode film layer including a central region and a peripheral region surrounding the central region, where a lithium source used for supplementing lithium to the first negative electrode film layer is stored in at least a portion of the peripheral region of the second negative electrode film layer.

Artificial graphite and prepartion method thereof, negative electrode plate, secondary battery, battery module, battery pack and electrical device

An artificial graphite and preparation method thereof, negative electrode plates, secondary batteries, battery modules, battery packs, and electrical device are provided. In some embodiments, the artificial graphite has a particle size of Dv5016 μm and an air oxidation peak temperature Tpeak of 830° C., wherein the air oxidation peak temperature Tpeak of artificial graphite refers to the highest peak temperature of a differential thermo-gravimetric analysis curve obtained when the artificial graphite is subjected to a thermo-gravimetric test having a weighing mass of 10±0.05 mg, with a purging gas of air, an airflow rate of 60 mL/min, and a heating rate of 5° C./min, in a test temperature range of 40° C. to 950° C. By the present application, the resulting secondary batteries have higher first-cycle Coulomb efficiency and longer cycle life under the premise of good fast charging performance.

Secondary battery and preparation method thereof, battery module, battery pack, and electric apparatus

This application relates to a secondary battery including a positive electrode plate and a negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer provided on each of two surfaces of the positive electrode current collector, the negative electrode plate includes a negative electrode current collector and a negative electrode film layer provided on each of two surfaces of the negative electrode current collector, and the negative electrode film layer includes a reaction zone opposite the positive electrode film layer and a non-reaction zone not opposite the positive electrode film layer, where a barrier layer is provided on a surface of the non-reaction zone. This application also relates to a preparation method of secondary battery, a battery module, a battery pack, and an electric apparatus.

Secondary battery and device comprising said secondary battery

Secondary battery, process for preparing the same and apparatus containing the secondary battery

The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the same. In particular, the secondary battery comprises a negative electrode plate, and the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is disposed on at least one surface of the negative current collector and comprises a first negative electrode active material; the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, and the second negative electrode active material comprises secondary particles, a number percentage of which is greater than or equal to 20%, wherein the first negative electrode active material comprises natural graphite and the second negative electrode active material comprises artificial graphite.

Silicon-carbon composite material and preparation method therefor, negative electrode material, negative electrode sheet, electrode assembly, battery, electric device, and carbon matrix

This application provides a silicon carbon composite material and a preparation method therefor, a negative electrode material, a negative electrode plate, an electrode assembly, a battery, an electric apparatus, and a carbon matrix, relating to the field of battery technologies. The silicon carbon composite material includes a carbon matrix and a silicon material, the carbon matrix has a cross-linked porous structure internally, and the silicon material is at least partially distributed in the cross-linked porous structure. A value of flexibility C1 of the silicon carbon composite material satisfies 0.4≤C1≤2. In this application, C1 is a factor by which a compression deformation variable of the silicon carbon composite material is scaled to be equal to its rebound deformation variable, representing flexibility of the silicon carbon composite material. When the C1 value satisfies 0.4≤C1≤2, the silicon carbon composite material has good flexibility, reducing overall impact of expansion stress of silicon on the silicon carbon composite material, and allowing for a certain degree of contractility of the carbon matrix framework, so that residual stress can be received and released, thereby maintaining overall stability of the silicon carbon composite material.

Negative electrode sheet, secondary battery, battery module, battery pack, and electric apparatus

The present application provides a negative electrode plate, a secondary battery, a battery module, a battery pack, and an electrical device. The negative electrode plate includes: a negative electrode current collector; and a negative electrode film layer which is located on at least one surface of the negative electrode current collector and includes first negative electrode active material particles and second negative electrode active material particles, the first negative electrode active material particles including a plurality of adsorption holes and having a tap density of 0.4 g/cm³-1.4 g/cm³, wherein a difference d in median particle size between the first negative electrode active material particles and the second negative electrode active material particles satisfies: 3 µm ≤ d ≤ 19 µm, and a compaction density PD of the negative electrode film layer satisfies: 0.8 g/cm³ ≤ PD ≤ 1.4 g/cm³.

Silicon-carbon composite material and negative electrode sheet containing same

The present application relates to a silicon-carbon composite material in the form of particles comprising a porous carbon skeleton, a silicon-containing deposition layer, and a carbon-containing coating layer, wherein the silicon-containing deposition layer is in pores of the porous carbon skeleton, the carbon-containing coating layer is on the silicon-containing deposition layer and/or on the surface of the particles, and the silicon-carbon composite material has an oil absorption number of 35 mL/100 g to 80 mL/100 g. The silicon-carbon composite material of the present application has a high energy density and an improved cycle life. In addition, the present application further relates to a negative electrode plate comprising the material, a secondary battery, a battery module, a battery pack, and a power consuming device.

Negative electrode plate, secondary battery, battery module, battery pack, and electrical device

The present application provides a negative electrode plate, a secondary battery, a battery module, a battery pack, and an electrical device. The negative electrode plate includes: a negative electrode current collector; and a negative electrode film layer which is located on at least one surface of the negative electrode current collector and includes first negative electrode active material particles and second negative electrode active material particles, the first negative electrode active material particles including a plurality of adsorption holes and having a tap density of 0.4 g/cm3-1.4 g/cm3, wherein a difference d in median particle size between the first negative electrode active material particles and the second negative electrode active material particles satisfies: 3 μm≤d≤19 μm, and a compaction density PD of the negative electrode film layer satisfies: 0.8 g/cm3≤PD≤1.4 g/cm3.