Abstract: The disclosure provides a functional thermal insulation device for a lithium battery, including a functional material which is a material having a fire extinguishing function and a heat absorption and cooling function. The functional thermal insulation device is fixedly mounted on the side face of a lithium ion unit cell. The device can more effectively prevent a heat transfer phenomenon between lithium ion unit cells, reduce energy generated by deflagration of the lithium battery and avoid the ignition of lithium ion unit cells, thereby effectively reducing chain reaction generated by ignition or explosion of the lithium ion battery, and improving the safety performance of the lithium ion battery to a great extent.

Abstract: A battery enveloping assembly and a battery incorporating such an enveloping assembly are disclosed. The enveloping assembly comprises an explosion-proof assembly and an enveloping plate. A casing extends downwardly from the enveloping plate. An external surface of the enveloping plate is provided with a connection portion protruding outwardly relative to the casing. A cavity configured to house the explosion-proof assembly is formed in the casing. A lower portion of the casing is bent inwardly to form a bending portion so as to secure the explosion-proof assembly inside the casing in an insulating and sealing manner. A first through hole through which an electrode is connected to the explosion-proof assembly is provided at a center of the bending portion, and a second through hole through which an electrode extends out from the explosion-proof assembly is provided in the enveloping plate which is disposed on the top of the casing.

Abstract: A battery enveloping assembly and a battery incorporating such an enveloping assembly are disclosed. The enveloping assembly comprises an explosion-proof assembly and a casing with a cavity. A protruding annular sealing connection portion is provided in the middle of the external surface of the casing. An inner wall of the casing is provided with an annular sealing groove. The explosion-proof assembly is secured in the casing in an insulating and sealing manner through the annular sealing groove. A first through hole through which an electrode is connected to the explosion-proof assembly is provided in a center of a bottom of the casing. A second through hole through which an electrode extends out from the explosion-proof assembly is provided in a top of the casing.

Abstract: A battery enveloping assembly and a battery incorporating such an enveloping assembly are disclosed. The enveloping assembly comprises an explosion-proof assembly and an enveloping base. A cavity configured to house the explosion-proof assembly is provided at a center of the enveloping base. A supporting surface configured to support the explosion-proof assembly is provided on the enveloping base at a bottom of the cavity. A first through hole through which an electrode is connected to the explosion-proof assembly is provided in the supporting surface. The explosion-proof assembly is secured inside the cavity in an insulating and sealing manner. A second through hole through which an electrode extends out from the explosion-proof assembly is provided in the enveloping base on a top of the cavity.

Abstract: A battery case is provided, comprising a cylindrical body (1), a top cover plate (3) and a bottom cover plate (4). The cylindrical body (1) comprises a top which is open and covered with the top cover plate (3) fixed thereto, and the cylindrical body (1) further comprises a bottom configured to be a supporting surface (8) having an opening (2). The opening (2) of the supporting surface (8) is configured to be covered with the bottom cover plate (4). Further, the opening (2) is configured to be a stepped opening or a conical opening. Still further, a first groove (12) is arranged on an exterior surface of the bottom surrounding the opening (2), and a second groove (13) is arranged on an exterior surface of the bottom cover plate next to the opening (2) of the bottom. A battery made of the battery case is also provided.

Abstract: After undergoing overcharge abuse, non-aqueous rechargeable lithium batteries can be left in a relatively hazardous state of charge, representing a safety concern with respect to subsequent thermal or mechanical abuse. Electrolyte additives which electrochemically form conductive polymers can be used to create a short circuit inside the battery as a result of overcharge abuse and automatically discharge the battery internally. The invention is particularly suitable for batteries equipped with electrical disconnect devices which cannot be discharged externally after the disconnect has activated. Aromatic compounds such as biphenyl are particularly suitable additives.

Abstract: Non-aqueous rechargeable lithium batteries can be equipped with internal electrical disconnect devices to protect against overcharge abuse. At the abnormally high voltages of overcharge, the devices can be activated by gasses generated as a result of the electrochemical polymerization of suitable monomer additives incorporated in the electrolyte. Aromatic compounds such as biphenyl are particularly suitable aromatic additives for LiCoO.sub.2 based lithium ion batteries.

Abstract: The loss in delivered capacity upon cycling non-aqueous rechargeable lithium batteries can be reduced by incorporating a small amount of B.sub.2 O.sub.3 additive in the electrolyte. The B.sub.2 O.sub.3 additive is preferably dissolved in the electrolyte prior to assembling the battery. The invention is particularly suited to lithium ion rechargeable batteries.

Abstract: The loss in delivered capacity (fade) after cycling non-aqueous rechargeable lithium batteries can be reduced by incorporating a small amount of certain additive compounds in the battery. The additive compound comprises boron, oxygen, and organic end groups that are chemically compatible with the battery components. The structure of the additive compound contains a boroxine (BO).sub.3 ring. The invention is particularly suited to lithium ion batteries. Trimethoxyboroxine and trimethylboroxin are particularly effective additives. Preferably, the additive compound is dissolved in the electrolyte.

Abstract: Non-aqueous rechargeable lithium batteries can be protected against overcharge abuse by incorporating small amounts of suitable aromatic additives into the electrolyte. The additives are electrochemically polymerized at abnormally high voltages, thereby increasing the internal resistance of the battery and thus protecting it. Aromatic additives such as biphenyl, 3-chlorothiophene, and furan are particularly suitable for certain lithium ion batteries. The additives need not and may preferably not polymerize during overtemperature abuse.

Abstract: Non-aqueous rechargeable lithium batteries are often equipped with internal electrical disconnect devices to protect against overcharge abuse. At the abnormally high voltages of overcharge, these devices can be activated by gasses generated as a result of the electrochemical polymerization of suitable monomer additives incorporated in the electrolyte. Aromatic compounds such as biphenyl are particularly suitable aromatic additives for LiCoO.sub.2 based lithium ion batteries.

Abstract: A simple method is disclosed for preparing LiPF.sub.6 based electrolytes for use in lithium non-aqueous batteries. LiPF.sub.6 is synthesized in a mixture of solvents employed in the electrolyte itself. Using the invention method, residual reactants and by-products of the reaction are easily removed to a required level for practical battery applications while the LiPF.sub.6 remains in solution. The method is suitable for preparing electrolytes for lithium ion batteries wherein solvents such as diethylcarbonate, ethylene carbonate, and propylene carbonate are employed.