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High-safety lithium ion battery

A lithium-ion battery, safety performance technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve complex problems

Inactive Publication Date: 2011-04-27
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, safety valves or explosion-proof notches are installed on lithium-ion batteries at present, but none of them can solve the safety problems such as battery fire or explosion from the root cause, and the scheme is also relatively complicated.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0023] According to the lithium ion secondary battery provided by the present invention, the main steps of the preparation method of the battery are well known to those skilled in the art. Generally speaking, the preparation method of the battery includes placing the electrode group in the battery case, adding an electrolyte, Then it is sealed to obtain a lithium ion secondary battery. Wherein, the sealing method and the usage amount of the electrolyte are known to those skilled in the art.

[0024] As long as it is noted that when adding a conductive agent to the positive electrode slurry and / or negative electrode slurry, it should be noted that the conductive agent should use a high-molecular positive temperature coefficient heat-sensitive material.

Embodiment 1

[0026] The positive active material is LiCoO2, and the binder is PVDF. Dissolve PVDF in the solvent NMP to prepare a PVDF solution, put the positive electrode active material and the conductive polymer substance as a conductive agent together into the solvent, and mix well to make a positive electrode slurry, which is composed of LiCoO2:PVDF:polymer Conductive agent = 100:8:6.89. Coating and sheeting the prepared positive electrode slurry.

[0027] Graphite is used as the negative electrode active material, and CMC and SBR are used as the binder. Dissolve CMC in water to make CMC solution, add graphite into the solvent, mix well, then add SBR emulsion to make slurry, which consists of graphite: CMC: SBR: polymer conductive agent = 100: 1.5: 2.5: 3.22. The prepared negative electrode slurry is coated and made into sheets.

[0028] The above-mentioned positive electrode sheet, negative electrode sheet, and separator are wound to form the pole core of the lithium-ion square b...

Embodiment 2

[0030] The positive electrode slurry composition in Example 1 was changed to LiCoO2:PVDF:polymer conductive agent=100:8:4.5.

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Abstract

The invention aims to solve the technical problem of fire or explosion of batteries and provides a high-safety lithium ion battery which can radically realize fire resistance and explosion prevention. The high-safety lithium ion battery comprises a positive pole piece, a diaphragm and a negative pole piece, wherein the diaphragm is positioned between the positive pole piece and the negative pole piece; the positive pole piece comprises a positive-pole current collector and positive pole pulp, and the positive pole pulp is coated on the positive-pole current collector; the negative pole piece comprises a negative-pole current collector and negative pole pulp, and the negative pole pulp is coated on the negative-pole current collector; and the positive pole pulp and / or the negative pole pulp comprises a conductive agent which is a high-polymer thermosensitive material with positive temperature coefficients. In the pole piece added with the high-polymer thermosensitive material with positive temperature coefficients, under uncommon conditions, when current or temperature rises sharply, the specific resistance follows to rise, thus a conductive network is destroyed, thermal runaway generated by batteries is prevented and a preventative effect is played on the thermal runaway of the lithium ion batteries. The invention greatly increases the safety performance of the lithium ion battery and can radically solve the safety problem of batteries.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to the field of lithium ion batteries with high safety performance added with conductive agent. Background technique [0002] Since the advent of lithium-ion batteries, due to their advantages of high working voltage, large specific energy, small self-discharge, no memory effect, long life and low environmental pollution, all countries have paid attention to military, civilian portable electronic products, electric vehicles and other fields. applications showed great interest and enthusiasm. More and more users and R&D personnel are constantly exploring and improving the performance and process of lithium-ion batteries. [0003] The safety performance of lithium-ion batteries is highly valued by people in the industry. Because lithium-ion batteries are used in mobile phones, toys, automobiles and other fields, they are required to be fire-proof and explosion-proof. The batterie...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王丽姝王慧颖顾高炜
Owner SHANGHAI BYD
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