Secondary battery

A secondary battery and electrolyte technology, applied in the direction of secondary battery, secondary battery repair/maintenance, battery pack parts, etc. The effect of preventing thermal runaway and reducing closed-cell temperature

Active Publication Date: 2017-06-13
JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the closed cell temperature of the commonly used PE separator is about 130°C, and the closed cell temperature of the PP separator is about 150°C. Usually, at such a h

Method used

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Embodiment Construction

[0037] The present application will be further elaborated below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application.

[0038] The application relates to a secondary battery, including a positive pole piece, a negative pole piece, a diaphragm and an electrolyte. The diaphragm of the present application is a composite diaphragm, including a diaphragm matrix and a coating arranged on the surface of the diaphragm matrix. The coating contains polymer The softening temperature of the microspheres and polymer microspheres is 50-120°C; meanwhile, the electrolyte of the secondary battery of the present application contains additives, and the decomposition voltage of the additives is 4.4V-4.8V.

[0039]The additive in this application refers to an additive that undergoes a chemical reaction at a specific voltage and releases heat, and t...

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Abstract

The invention relates to the field of energy storage materials, in particular to a secondary battery which comprises an anode piece, a cathode piece, a diaphragm and electrolyte. The diaphragm comprises diaphragm matrixes and coatings, the coatings are arranged on the surfaces of the diaphragm matrixes and comprise polymer micro-spheres, and the softening temperatures of the polymer micro-spheres are 50-120 DEG C; the electrolyte comprises additives, and the decomposition voltages of the additives are 4.4V-4.8V. The secondary battery has the advantages that sufficient hole closing of the diaphragm can be synergistically promoted by the diaphragm with the polymer micro-sphere coatings and the additives, the polymer micro-spheres with the low softening temperatures are coated on the surfaces of the diaphragm, and accordingly the hole closing temperature of the diaphragm can be lowered; the voltages can be increased, accordingly, the reactive additives can be triggered, self-reaction can be quickly carried out at over-charge initial phases to generate heat, and melting of the polymer micro-spheres and large-area hole closing of the diaphragm can be promoted.

Description

technical field [0001] The present application relates to the field of energy storage materials, in particular, to a secondary battery. Background technique [0002] As the safety requirements of lithium-ion batteries increase, the requirement for the separator to have a shutdown function also increases. The closed cell temperature of the diaphragm is an important parameter reflecting the safety characteristics of the diaphragm. When the internal temperature of the battery rises to the closed cell temperature of the diaphragm under abnormal conditions, the micropores of the diaphragm are automatically closed to prevent the conduction of ions and cut off the charging current, thereby preventing the battery from thermal runaway. This feature can provide some safety protection for lithium-ion batteries. At present, the closed cell temperature of the commonly used PE separator is about 130°C, and the closed cell temperature of the PP separator is about 150°C. Usually, at such ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0567H01M10/42H01M10/0525H01M50/411
CPCH01M10/0525H01M10/0567H01M10/4235H01M50/411Y02E60/10
Inventor 陈小波陈世龙
Owner JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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