A kind of soft-pack lithium-ion battery and nail penetration test method
A technology for lithium-ion batteries and soft packs, which can be applied to secondary batteries, circuits, electrical components, etc., and can solve problems such as copper foil being unable to conduct conductive tests with aluminum foil, thermal runaway, and failure
Active Publication Date: 2020-10-23
HIGHPOWER TECH HUIZHOU
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Problems solved by technology
[0002] The soft-pack lithium-ion battery is composed of positive electrode, negative electrode, separator, organic electrolyte, etc. Since the electrolyte is an organic flammable substance, the thermal stability of the positive electrode material is poor. When the nail penetration test is performed, the gap between the positive and negative electrodes of the battery A short circuit occurs instantly, and the short circuit generates a large amount of Joule heat. When the heat accumulates to a certain extent, it will trigger a chemical reaction and generate chemical heat. The heat accumulation will cause thermal runaway, and in severe cases, the battery will catch fire or even explode.
[0003] The conventional method to improve the nail penetration test performance of soft-pack lithium-ion batteries is to use the MJ structure, that is, to use the safety short circuit between the copper foil and the aluminum foil to guide other dangerous short circuits. However, due to the low melting point of the aluminum foil, it is possible to The short-circuit point of the nail mouth melts, and the copper foil cannot conduct electricity with the aluminum foil after melting, causing test failure
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[0022] The idea, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0023] It should be noted that, unless otherwise specified, when a feature is called "fixed" or "connected" to another feature, it can be directly fixed and connected to another feature, or indirectly fixed and connected to another feature. on a feature. In addition, descriptions such as up, down, left, right, front, and back used in the present invention are only relative to the mutual positional relationship of the components of the present invention in the drawings.
[0024] Also, unless defined otherwise, all technical and scientific ter...
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The invention relates to the technical field of lithium-ion batteries, and discloses a soft-pack lithium-ion battery and a nail penetration test method. The soft-pack type lithium ion battery of the present invention comprises a positive electrode sheet and a negative electrode sheet wound with each other, a blank aluminum foil is provided at the starting end of the winding of the positive electrode sheet, a positive electrode ear is provided on the blank aluminum foil, and a positive electrode tab is also provided on the blank aluminum foil. There is a metal sheet, the metal sheet is located at the position where the steel nail passes through during the nail penetration test of the pouch type lithium ion battery, and the melting point of the metal sheet is higher than that of the blank aluminum foil. In the nail penetration test method of the soft pack lithium ion battery of the present invention, a metal sheet having a higher melting point than the blank aluminum foil is added at the nail penetration position of the blank aluminum foil. The soft pack type lithium ion battery and the nail penetration test method of the present invention ensure the continuous connection of the blank aluminum foil and the blank copper foil through the arrangement of the metal sheet.
Description
technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a soft-pack lithium-ion battery and a nail-piercing test method for improving the performance of the nail-piercing test. Background technique [0002] The soft-pack lithium-ion battery is composed of positive electrode, negative electrode, separator, organic electrolyte, etc. Since the electrolyte is an organic flammable substance, the thermal stability of the positive electrode material is poor. When the nail penetration test is performed, the gap between the positive and negative electrodes of the battery A short circuit occurs instantly, and the short circuit generates a large amount of Joule heat. When the heat accumulates to a certain extent, it will trigger a chemical reaction and generate chemical heat. The heat accumulation will cause thermal runaway, and in severe cases, the battery will catch fire or even explode. [0003] The conventional method to improv...
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IPC IPC(8): H01M10/0525H01M10/0587
CPCH01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 缪志强吴德辉廖兴群于立娟
Owner HIGHPOWER TECH HUIZHOU