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 ca

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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 assembly in the battery case and adding electrolyte, Then, it was sealed to obtain a lithium ion secondary battery. Among them, the sealing method and the amount of electrolyte are well known to those skilled in the art.

[0024] Just pay attention to the use of polymer positive temperature coefficient thermal sensitive materials when the conductive agent is added to the positive electrode slurry and / or the negative electrode slurry.

Example Embodiment

[0025] Example 1

[0026] The positive electrode active material is LiCoO2, and the binder is PVDF. Dissolve PVDF in solvent NMP to prepare PVDF solution, put the positive electrode active material and conductive polymer material as a conductive agent into the solvent, mix well to make positive electrode slurry, its composition is LiCoO2: PVDF: polymer Conductive agent=100:8:6.89. The prepared positive electrode slurry is coated and sliced.

[0027] The negative electrode active material uses graphite, and the binder uses CMC and SBR. Dissolve CMC in water to prepare a CMC solution, add graphite into the solvent, mix well, and then add SBR emulsion to make a slurry, which is composed of graphite: CMC: SBR: polymer conductive agent = 100: 1.5: 2.5:3.22. The prepared negative electrode slurry is coated and sliced.

[0028] Use the above-prepared positive electrode sheet, negative electrode sheet, and separator to wind the pole core of a lithium ion square battery, put the pole cor...

Example Embodiment

[0029] Example 2

[0030] The composition of the positive electrode slurry 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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