ORGANIZATION OF A CELL WITH IMPROVED POWER DENSITY

APPARATUS FOR RELEASING GAS FROM RECHARGEABLE LITHIUM ELECTROCHEMICAL CELL DURING FORMATION STAGE IN ITS MANUFACTURING

PROBLEM TO BE SOLVED: To provide an alkali metal secondary electrochemical cell, preferably a lithium ion cell, provided with a removable gas release valve. SOLUTION: The gas release valve is positioned on the casing of the cell so as to allow fluid to flow through between the inside and outside thereof. The valve serves to remove cell gases generated in the cell during cell formation. Once the formation of the lithium ion cell has completed, the release valve is removed and replaced with a hermetic closing material. The valve removal and the cell sealing is processed in an environment where no outside gases are introduced in the casing. The cell is also provided in a tank filled with an inert gas, using a filter which separates the cell gases from the inert gas. When the cell formation has been completed, the cell is hermetically sealed. COPYRIGHT: (C)2002,JPO ...

Insulative component for an electrochemical cell

An insulator ring for preventing short circuit contact between the opposite polarity electrode in a case-terminal cell design is described. Typically, a lithium/silver vanadium oxide cell is built in a case-negative design with the casing serving at the negative terminal. The cathode is connected to an insulated terminal pin. In a conventional cell construction, the electrode assembly is enclosed in an insulator bag in addition to the electrode separator envelopes before being housed inside the casing. The insulator bag ensures the cathode electrode will not come into short circuit contact with the casing. In the present invention, the insulator bag is replaced with an insulator ring which only protects those portions of the electrode assembly vulnerable to short circuit contact.

Electrochemical cell having a casing of mating portions

The present invention is directed to an electrochemical cell having plate electrodes housed inside mating "clam shell" casing components. Also, the present casing design allows for indentation structures in the casing components by virtue of them being stamped metal parts. Such indentations are not possible with traditional cylindrical and prismatic casing designs. When mated together, the casing components are form-fitting with respect to the internal battery structure so as to reduce the overall size of the electrochemical package. This provides the cell with the greatest amount of energy per unit size.

Lithium/fluorinated carbon (Li/CFx) electrochemical cell

An electrochemical cell comprising a cathode of a powder material pressed into intimate contact with a rod-shaped current collector and an anode at least partially wrapped around the cathode is described. The cathode current collector is preferably provided with a plurality of offset flats offset with respect to each other. This helps prevent the cathode active material from sliding off of the rod-shaped current collector. The anode has spaced apart edges at opposite ends of its width that form a gap with the anode wrapped around the cathode. This helps in sliding the anode/cathode electrode assembly into a cylindrical tube comprising the cell casing. A preferred chemistry is a lithium/CF x activated with a nonaqueous electrolyte.

Electrochemical cell having a galaxy wind design

An electrochemical cell is described. The cell comprises a cathode material contacted to a perforated current collector having a portion left uncovered and an anode material contacted to an anode current collector. The anode comprises first and second strips positioned on opposite sides of the cathode, which is also in the form of a strip, but one that is much longer than each of the anode strips. Proximal ends of the anode strips reside adjacent to where the cathode is secured to a terminal pin/sleeve assembly. Distal ends of the anode strips are adjacent to the opposed ends of the cathode strip. A separator sheet segregating the anode from direct contact with the cathode provides an upper portion at least partially sealed to a lower portion along an aligned peripheral edge and through the uncovered perforations of the cathode current collector to lock the cathode in position. The anode and cathode are then wound into a galaxy electrode assembly housed in a cylindrical casing and activated ...

Gestaltung einer Zelle mit verbesserter Energiedichte

Apparatus for releasing gases from rechargeable lithium electrochemical cells during the formation stage of manufacturing

An alkali metal secondary electrochemical cell, and preferably a lithium ion cell, provided with a removable gas relief valve, is described. The gas release valve is positioned on the casing, in fluid flow communication between the inside thereof and the exterior. This gas release valve serves to eliminate cell gases that build up inside the casing during the cell's formation stage. Once the lithium-ion cell has completed formation, the gas release valve is removed and replaced with a hermetic closure. Removal of the gas release valve and sealing of the cell takes place in an environment in which no outside gas is capable of being introduced inside the casing. The cell can also be provided in a tank filled with inert gas and a filter which separates the cell gas from the inert gas. When cell formation is completed, the cell hermetically sealed.

Electrochemical cell having a pocket separator design

An electrochemical cell comprising a cathode material contacted to a perforated current collector having a portion left uncovered and an anode material contacted to an anode current collector is described. A separator sheet segregating the anode from direct contact with the cathode is folded back upon itself along a crease with an upper portion at least partially sealed to a lower portion along an aligned peripheral edge to form an envelope. A first envelope portion houses the cathode having the uncovered portion of the cathode current collector spaced from the crease and a second envelope portion houses the anode. The first envelope portion is sealed to the second envelope portion through the uncovered perforations of the cathode current collector to lock the anode aligned with the cathode. The anode and cathode are then wound into a jellyroll electrode assembly housed in a cylindrical casing and activated with an electrolyte.

CELL STRUCTURE WITH IMPOROVED ENERGY DENSITY

PROBLEM TO BE SOLVED: To provide a cell structure with improved cell-designing flexibility and energy density. SOLUTION: The structure comprises an anode 71, a cathode 33, an electrolyte solution for activating the anode in electrochemical conjunction with the cathode, and a casing enveloping the anode and the cathode. This casing consists of a first part 12 having a first enveloping side wall extending and connecting to a substantially flat first main face wall and a second part 12 having a second enveloping side wall extending and connecting to a substantially flat second main face wall, and the first and the second parts of the casing are combined together so as to make a seal-connection 62 of the first enveloping side wall and the second enveloping side wall in order to contain the anode, the cathode and the electrolyte solution. COPYRIGHT: (C)2001,JPO ...

INSULATING COMPONENT FOR ELECTROCHEMICAL BATTERY

PROBLEM TO BE SOLVED: To provide an insulating ring for preventing short-circuit between opposite polarity electrodes in a case-electrode battery structure. SOLUTION: A general lithium/silver vanadium oxide battery is prepared by a case-negative electrode design whereby a casing functions as a negative electrode. A cathode is connected to an insulated terminal pin. In the case of a general battery structure, a battery assembly is enclosed in an insulating bag in addition to an electrode separator envelope. The insulating bag is to guarantee that no contact short circuit is caused between the cathode electrode and the casing. The insulating bag is replaced by the insulating ring and protects only a part of the electrode assembly vulnerable to the contact short circuit. COPYRIGHT: (C)2003,JPO ...

Method for providing an electrochemical cell having a pocket seperator design

A method of manufacturing an electrochemical cell is described. A separator sheet segregating the anode from direct contact with the cathode is folded back upon itself along a crease with an upper portion at least partially sealed to a lower portion along an aligned peripheral edge to form an envelope. A first envelope portion houses the cathode having an uncovered portion of the cathode current collector spaced from the crease and a second envelope portion houses the anode. The first envelope portion is sealed to the second envelope portion through uncovered perforations of the cathode current collector to lock the anode aligned with the cathode. The anode and cathode are then wound into a jellyroll electrode assembly housed in a cylindrical casing and activated with an electrolyte.

Primary electrochemical cell having scalloped electrodes

A primary lithium electrochemical cell housed in a casing having a curved side wall intermediate opposed generally planar face walls is described. The cell comprises an anode and a cathode that each has a plurality of face portions joined together by connecting portions. The opposite polarity face portions and connecting portions are aligned with each other and then the electrodes are wound to provide an electrode assembly that fits in the casing. Regardless whether the cell is balanced as either an anode-limited or cathode-limited configuration, however, it is desirable to have the active material of one electrode face portion directly facing the electrode material of the counter electrode face portion. This means that the dimensional extent of the facing electrodes should be as close to each other in areas as possible to match the desired anode- or cathode-limited balance. The same is true for the connecting portions. The cell is of a high energy density for an implantable biomedical ...

Lithium/fluorinated carbon (Li/CFx) electrochemical cell

... an electrochemical cell comprising a cathode of a powder material pressed into intimate contact with a rod-shaped current collector and an anode at least partially wrapped around the cathode is described. The cathode current collector is preferably provided with a plurality of offset flats offset with respect to each other. This helps prevent the cathode active material from sliding off of the rod-shaped current collector. The anode has spaced apart edges at opposite ends of its width that form a gap with the anode wrapped around the cathode. This helps in sliding the anode/cathode electrode assembly into a cylindrical tube comprising the cell casing. A preferred chemistry is a lithium/CF_x activated with a nonaqueous electrolyte.

Dual weld plug for an electrochemical cell

The present invention is directed to an electrochemical cell having plate electrodes housed inside a mating “clamshell” casing. When mated together, the casing components are form-fitting with respect to the internal battery structure so as to reduce the overall size of the electrochemical package. A header assembly containing both a glass-to-metal seal opening for a terminal lead and an electrolyte fill opening is used in conjunction with the clamshell casing. The electrolyte fill opening is constructed with an elongated opening with at least two different radii. A first and second sealing element is welded within the electrolyte fill opening at different depths within the header to block the flow of electrolyte and form a hermetic seal.

Cathode assembly with bare current collector regions to facilitate winding

An electrode assembly constructed of continuous anode and cathode electrodes that are overlaid in overlapping fashion and wound into a cell stack suitable for prismatic and cuboidal-shaped cases. The cathode electrode strip has some regions where the electrode material is pressed to a high density and has some regions where the active material is substantially removed from the current collector screen.

Cell design for improved energy density

An electrochemical cell having plate electrodes (16) housed inside mating "clam shell" casing components (12,14). Also, the present casing design allows for indentation structures (30,32) in the casing components by virtue of them being stamped metal parts. Such indentations are not possible with traditional cylindrical and prismatic casing designs. When mated together, the casing components are form-fitting with respect to the internal battery structure so as to reduce the overall size of the electrochemical package. This provides the cell with the greatest amount of energy per unit size. <IMAGE>

High performance wound battery

Cell stack design with bi-directionally wound slotted electrodes

An electrochemical cell comprising an electrode assembly in which opposite polarity electrodes are wound together in a bi-directional fashion yielding a high energy density cell stack with low internal impedance is described. Each electrodes is constructed having a slot provided into its width at about a midportion thereof. The slots are brought into registry with each other to form a collapsible X-shaped electrode assembly, which is then bi-directionally folded to provide a wound electrode assembly.

Insulative component for an electrochemical cell

An insulator ring for preventing short circuit contact between the opposite polarity electrode in a case-terminal cell design is described. Typically, a lithium/silver vanadium oxide cell is built in a case-negative design with the casing serving at the negative terminal. The cathode is connected to an insulated terminal pin. In a conventional cell construction, the electrode assembly is enclosed in an insulator bag in addition to the electrode separator envelopes before being housed inside the casing. The insulator bag ensures the cathode electrode will not come into short circuit contact with the casing. In the present invention, the insulator bag is replaced with an insulator ring which only protects those portions of the electrode assembly vulnerable to short circuit contact.

Insulative component for an electrochemical cell

An insulator ring for preventing short circuit contact between the opposite polarity electrode in a case-terminal cell design is described. Typically, a lithium/silver vanadium oxide cell is built in a case-negative design with the casing serving at the negative terminal. The cathode is connected to an insulated terminal pin. In a conventional cell construction, the electrode assembly is enclosed in an insulator bag in addition to the electrode separator envelopes before being housed inside the casing. The insulator bag ensures the cathode electrode will not come into short circuit contact with the casing. In the present invention, the insulator bag is replaced with an insulator ring which only protects those portions of the electrode assembly vulnerable to short circuit contact.

Gestaltung einer zelle mit verbesserter energiedichte

Gewickelte hochleistungsbatterie

巻成用可変密度カソードアセンブリ

(57)【要約】 【課題】 比較的高密度な電極構造を有する電池を提供 しようとする。 【解決手段】 互いに重ね合わせて角柱型又は他の非円 筒型ケースに適したセルスタックとして巻き形成した連 続アノード電極２１、２４及び連続カソード電極１０よ り、電極アセンブリを構成した。カソード電極細長片 は、電極材料が、高密度で圧接する幾つかの領域１３ と、活物質が低密度で圧接する幾つかの領域１６を有し ている。このような領域設定は、低密度領域を巻き形成 されたセルスタック２０における曲げ領域１７に対応さ せるものである。

Co-Axial Glass-To-Metal Seal Feedthrough For A Case-Neutral Electrochemical Cell

A case-neutral electrochemical cell has an electrode assembly comprising a separator positioned between an anode and a cathode housed inside a casing. The casing supports a co-axial glass-to-metal seal comprising an inner insulating glass hermetically sealed to a terminal pin and to the inner surface of a first or inner ferrule. An outer insulating glass is hermetically sealed to the outer surface of the inner ferrule and the inner surface of a second or outer ferrule, and the outer ferrule is secured to an opening in the casing. Then, one of the anode and the cathode is connected to the terminal pin and the other of the anode and the cathode is connected to the first or inner ferrule. An electrolyte is provided in the casing to activate the electrode assembly.

Co-Axial Glass-To-Metal Seal For A Case-Neutral Electrochemical Cell

A case-neutral electrochemical cell has an electrode assembly comprising a separator positioned between an anode and a cathode housed inside a casing. The casing supports a co-axial glass-to-metal seal comprising an inner insulating glass hermetically sealed to a terminal pin and to the inner annular surface of an inner ferrule. An outer insulating glass is hermetically sealed to the outer annular surface of the inner ferrule and the inner annular surface of an outer ferrule, and the outer ferrule is secured to an opening in the casing. Then, one of the anode and the cathode is connected to the terminal pin and the other of the anode and the cathole is connected to the first or inner ferrule. An electrolyte is provided in the casing to activate the electrode assembly.

Co-axial glass-to-metal seal feedthrough for a case-neutral electrochemical cell

A case-neutral electrochemical cell has an electrode assembly comprising a separator positioned between an anode and a cathode housed inside a casing. The casing supports a co-axial glass-to-metal seal comprising an inner insulating glass hermetically sealed to a terminal pin and to the inner surface of a first or inner ferrule. An outer insulating glass is hermetically sealed to the outer surface of the inner ferrule and the inner surface of a second or outer ferrule, and the outer ferrule is secured to an opening in the casing. Then, one of the anode and the cathode is connected to the terminal pin and the other of the anode and the cathode is connected to the first or inner ferrule. An electrolyte is provided in the casing to activate the electrode assembly.