Power lithium ion battery and production method thereof

Technical Field

The invention relates to a lithium ion battery field, in particular to a power lithium ion battery.

Background Art

The lithium ion battery is a rechargeable battery, which is the representative of the modern high-performance battery. Lithium ion batteries are widely used in notebook computers, video camera, digital camera, mobile phone and products, such as an electric tool.

In the prior art using a winding structure of the lithium ion battery generally, the appearance is generally made into cylindrical or square. Wherein the general cylindrical battery comprises a cylindrical shell and are disposed in the casing of the cylindrical core, the cylindrical core has the advantages of compact structure, good pressure resistance, the relative elevation of the assembly, is not easy to be inflated, is suitable for mass production; the square battery generally includes shell and are disposed in the casing of a square core, the advantages of square battery is battery assembly is convenient, in a given battery pack in the housing space can be effectively utilized, the battery capacity even tens of thousands Ah can be achieved.

In the realization in the process of this invention, at least the prior art inventors have found that the following problems exist:

(1) is of cylindrical battery: low battery capacity, monomer capacity generally less than 5Ah, combined into a large capacity, the high-voltage battery pack, needs more quantity of battery monomer, monomer battery when the battery pack is difficult to guarantee the consistency of performance, the overall performance of the battery caused by packet can not reach the design requirement; cylindrical battery sometimes the size of the envelope by the battery is limited, cannot be used.

(2) in the square cell is:in general the core of the battery into the housing through the hot pressing and shaping process before, in order to make the the volume core is positive , compact structure a cathode plate, hot pressing and shaping process of the square battery caused by production cost is increased, it is very easy to make the positive, negative plate fracture the heated, thereby affecting the electrical performance of battery, more serious is extremely peice crack is easy to generate burr pierce the diaphragm, caused by the short circuit of the battery, thus affecting the safety performance of the battery; the hot pressing and shaping process even increase, the volume core is positive , between the negative pole piece is still relatively loose, the pole piece of the ion-conductive capacity between the, pole piece between the active material of the electron conduction ability of the low side, so as to cause the utilization factor of the active material of the battery is relatively low, the large current discharge is poor, the inner resistance of the battery is large, large thermal effect in the charging and discharging process and the like, and the battery swelling phenomenon is easily generated.

Content of the invention

The embodiment of the invention of the above-mentioned aiming to the deficiencies in the prior art, to provide a kind of battery safety performance high power lithium ion battery.

In order to achieve the above-mentioned purpose, the embodiment of the invention provides a power lithium ion battery, comprising a shell, of the seal in the casing of the battery and battery and the lower cover plate, the cover plate is provided on the battery is, the negative pole, of the stated battery is composed of a cylindrical small batteries which are connected in parallel, the small core by the positive electrode sheet, the diaphragm and a negative pole winding, the small core is provided with a positive, negative electrode tab, the shell is square.

More than two of the small core and connected in parallel into a small electricity core group , the small electricity core group is provided with a positive, negative ear, more than two of the small electricity core group are connected in parallel to form the core of the battery.

The positive, negative electrode tab located on the same end of the small core,

A power lithium ion battery also includes mounting the battery and between the upper cover plate and the core of the battery of the battery between the lower cover plate and the battery an insulating solid fastening clamp.

The insulating fastening clamp comprises an upper clamp plate and the lower plate, said upper clamping plate is provided with two small holes, the splint is arranged on the cover plate and on the battery between the battery, the holes on the battery the groove of the cover plate is formed with a through hole, the lower clamping plate which includes a base plate and a rectangular grid, the lower clamping plate is disposed on the battery between the lower cover plate and the said battery.

The rectangular grille having continuously arranged a circular through hole, the diameter of the circular through hole of large diameter than the small core of 0.2 mm -1 mm, the number of the circular through hole of the number of the small core of the same, is arranged at the lower part of the small core in the circular through hole.

The walls of the the rectangular grid is provided with a through hole.

The insulating fastening clamp is made of polyphenylene sulfide PPS or polytetrafluoroethylene.

The positive, negative electrode column comprises a circular pole, the circular pole is arranged below the boss T, the positive, negative electrode column comprises a circular pole, the circular electrode column under the boss is provided with a T, said T-shaped boss is arranged in the upper part of the groove of the is provided with a through hole.

The present invention provides another technical proposal is:a kind of power method of manufacturing lithium ion batteries, specifically comprises the following steps:

1, the positive, negative electrode are provided with pole ear-on-a-chip, then the positive electrode sheet, the diaphragm, which are stacked in sequence a cathode plate, is made into a cylindrical way of the small core;

2, the lower part of the small core is placed in the rectangular grid in a round through hole, the bottom of the small core of the lower splint substrate contact;

3, the small parallel, forming the core of the battery, wherein more than two small parallel form a small electricity core group , more than two of the small electricity core group are connected in parallel to form the core of the battery;

4, the round is the positive electrode column with the column and crosses the groove of the through hole, the negative pole round pole with a passes through the other groove of the through hole, the positive by the nut, are respectively fixed on the negative pole of the battery the upper cover plate;

5, each small electricity core group the positive, negative electrode tab is respectively fixed to the corresponding, the negative pole of the T-shaped boss on the lower part of the bus board;

6, the assembled battery core and the lower clamping plate is put into the shell, the battery and welded to one of the housing;

7, after fluid injection , sealing, retractor after the formation of the finished battery.

The embodiment of the invention has the advantages that: by the use of cylindrical small core in parallel to the battery, can meet the requirements for large current discharge, and the whole monomer battery performance is stable, the core of the battery in the front into the shell without hot pressing and shaping process, improving the performance and safety performance of the battery; the small core is composed of a positive electrode sheet, the diaphragm and the negative pole winded into a cylindrical structure, the structure is compact, high utilization of the active material of the battery, is beneficial to the large current discharge, the battery is not easy to be inflated. the small electricity core is positive , the negative pole of the same end of the small battery, when the battery pack to the volume utilization is high; the square housing, the battery can be the use of the size of the envelope by the battery and not limiting.

Description of drawings

Figure 1 is a structure diagram of the battery provided by the embodiment of the invention;

Figure 2 is a schematic diagram of the battery assembly provided by the embodiment of the invention;

Figure 3 is a top view of the rectangular grille provided by the embodiment of the invention;

Figure 4 is a top view of clamp provided by the embodiment of the invention;

Figure 5 is a schematic diagram of the groove provided by the embodiment of the invention is provided with a through hole;

Figure 6 is arranged on the circular pole and T a schematic diagram of the embodiment of the invention to provide.

In the Figure: 1 small core, 2 housing, 3 the upper cover plate of the battery, 4 circular pole, 5T boss, 6 the upper clamping plate, 7 holes, 8 the lower splint, 9 battery the lower cover plate, 10 positive, negative ear, 11 a circular through hole, 12 rectangular grid, 13 base plate, 14 through hole, 15T the upper part of the boss, 16 the groove is provided with a through hole.

Mode of execution

In order to make the the purpose of this invention, the technical scheme more clearly and advantages, will be illustrated in the Figure the embodiment of the invention further described in detail.

As shown in Figure 1, Figure 2 shows, a power lithium ion battery, which comprises a shell 2, is sealed in the housing 2 in the upper cover plate and lower cover plate of the battery and battery. The upper cover plate 3 is provided with a positive, the negative pole, of the stated battery is composed of a cylindrical small core 1 which are connected in parallel, small core 1 from positive pole plate, diaphragm, and cathode plates to which are stacked in sequence, small core 1 is provided with a positive, negative ear 10. The square shell of the battery 2.

By the use of this invention the cylindrical small batteries 1 and the battery, can meet the requirements for large current discharge, and the whole monomer battery performance is stable, the core of the battery into the shell before the hot-shaping process is not required, the pole piece so as to avoid the phenomenon of breakage is generated at the bending part, the electrical properties of the battery is improved, more the peice crack place the battery short-circuit phenomenon to produce burr, improving the safety performance of the battery. small electricity core 1 is composed of a positive electrode sheet, the diaphragm and the negative pole winded into a cylindrical structure, manufactures Jan , single is suitable for mass production, the structure is compact, high utilization of the active material of the battery, is beneficial to the large current discharge, the battery is not easy to be inflated. The square housing 2, can be the battery of the size limit of the jacket by the battery.

As shown in Figure 2, the two parallel small electricity core 1 and form a small electricity core group , a small electricity core group is provided with a positive electrode and a negative electrode tab a, in parallel to form the electricity core group solvnet of the battery, the small electricity core group of the positive, negative electrode tab 10 is located at the small core 1 one end of the same.

The small electricity core group is provided with a positive pole and a negative pole ear, the number of the tabs is reduced, the structure is simple, convenient tab and the connection of the bus plate. Small electricity core group of the positive, negative electrode tab 10 is arranged on the small core 1 with one end of, the, cathode can be LED out from one direction, convenient battery assembly, also convenient combination can effectively utilize the space of the bag body.

As shown in Figure 1, Figure 2, Figure 3 shows, also has power lithium ion battery mounted on the battery cover plate 3 and the core of the battery and battery between the lower cover plate 9 and the core of the battery is the insulation between the fastening clamp. The insulating fastening clamp comprises an upper clamp plate 6 and the lower clamping plate 8, refer to Figure 4 and Figure 5, the upper clamp plate 6 is provided with two small holes 7, small hole 7 and the upper clamping plate 6 and battery the upper cover plate 3 is formed with a through hole at the bottom of the groove 16, the upper clamp plate 6 is located on the upper cover plate of the battery 3 at the lower part, the lower clamping plate 8 comprises a base plate 13 and the rectangular grille 12, base plate 13 and the rectangular grating 12 is an integral structure, the lower clamping plate 8 is located in the cover plate 9 between with the battery. Rectangular grating 12 having continuously arranged a circular through hole 11, a circular through hole 11 than the small core diameter of 1 diameter is slightly large, normally large 0.2 mm -1 mm, a circular through hole 11 with a small number of core 1 the same number of, small core 1 is vertically set in the lower part of the circular hole 11 the inner, and the rectangular grating 12 stable, small core 1 with the base plate at the bottom of the 13 contact.

The core of the battery through the insulating fastening clamp fixing, can effectively avoid the electric tool in the process in the mobile use of the battery in the housing 2 the inner float, result in tab 10 fracture phenomenon.

As shown in Figure 2, rectangular grating 12 wall is provided with a through hole 14, that is, on two opposite wall surface of the through hole 14 is communicated with the internal wall, the through hole 14 can be a square, rhombic, circular or other shapes.

The through hole 14 is of the small core 1 in the housing 2 at a is communicated with the space, the play of the whole monomer the performance of the battery.

The insulation is the preferred material of the PPS (Phenylene   sulfide, poly-P-phenylene sulfide) or polytetrafluoroethylene, the material thermal conductivity is strong, high heat distortion temperature of the, flame-retardant effect is good.

As shown in Figure 1 and Figure 6, the positive, negative electrode column includes round terminal post with external screw thread 4, circular pole 4 is provided with a T boss 5, T boss 5 and round terminal post 4 and integrally connected, as by the nut, is fixed to the battery negative post of the upper cover plate 3 is, the upper part of the boss T 15 card is provided with a through hole at the bottom of the groove 16 the inner.

Through the upper part of the T-shaped boss 15 of the card is provided with a through hole at the bottom of the groove 16 can be prevented in the positive, negative electrode column to rotate.

Embodiments of this invention the power of the method of manufacturing lithium ion batteries, specific steps are as follows:

1, the positive, negative electrode sheet used for the spot welding or ultrasonic welding machine welds tab 10, and then the positive electrode sheet, the diaphragm, which are stacked in sequence a cathode plate, is made into a cylindrical way of the small core 1;

2, the small core 1 is placed at the lower part of the rectangular grille 12 circular hole 11 the inner, small core 1 at the bottom of the base plate and the lower clamp 13 contact;

3, two of the same row small electricity core 1 are connected in parallel to form a small electricity core group , a small electricity core group is provided with a positive pole and a negative pole lug, and then the three small electricity core group which are connected in parallel the core of the battery;

4, round terminal post the positive electrode of the column 4 is provided with a through hole which passes through the bottom part of the groove 16, the negative pole round terminal post 4 a passes through the other with the bottom of the groove of the through hole 16, the positive by the nut, the negative pole of the battery are respectively fixed to the upper cover plate 3 the upper;

5, each of the small electricity core group the positive tabs is fixed to the positive column T boss 5 on the lower part of the collector plate, each of said small electricity core group to the cathode of the T lug to fix to the negative post boss 5 on the lower part of the bus board;

6, the assembled battery core and the lower clamping plate 8 is put into the housing 2 the inner, upper cover plate of the battery 3 and the shell 2 is welded to the a;

7, after fluid injection , sealing, retractor after the formation of the finished battery.

The stated above is a preferable embodiment of the present invention, not to limit the invention, where in the present invention within the spirit and principle of the, any modifications made by the, equivalent replacement, improved, and the like, shall be included in the scope of protection of this invention.