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Electrochemical device and electronic device

An electrochemical and resistive layer technology, applied in the field of electrochemistry, can solve problems such as explosion, threat to user life and property safety, lithium-ion battery fire, etc., and achieve the effect of improving safety performance, avoiding battery explosion, and good safety performance.

Active Publication Date: 2022-04-12
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Thermal runaway is one of the most serious safety problems of lithium-ion batteries. Thermal runaway can cause fires and explosions in lithium-ion batteries, seriously threatening the lives and property of users.

Method used

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  • Electrochemical device and electronic device
  • Electrochemical device and electronic device
  • Electrochemical device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0059]

[0060] Mix the negative electrode active material graphite, the conductive agent conductive carbon black, and the binder styrene-butadiene rubber (SBR) according to the mass ratio of 96:1.5:2.5, and then add deionized water as a solvent to prepare a negative electrode slurry with a solid content of 70%. ingredients, and stir well. The negative electrode slurry is evenly coated on one surface of the negative electrode current collector copper foil with a thickness of 6 μm, and the mass of the negative electrode active material on the negative electrode sheet is 16.8g / cm 2 . drying at 110° C. to obtain a negative electrode sheet coated with the negative electrode slurry on one side. Afterwards, the above steps are repeated on the other surface of the negative electrode sheet to obtain a negative electrode sheet coated with negative electrode slurry on both sides. After the coating is completed, the negative electrode sheet is cold-pressed and cut into a size of 74.8...

Embodiment 1-2 to Embodiment 1-6

[0077] Except that relevant preparation parameters were adjusted according to Table 1, the rest were the same as in Example 1-1.

Embodiment 2-1 to Embodiment 2-12

[0079] Except for adjusting relevant preparation parameters according to Table 2, the rest are the same as in Example 1-1.

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Abstract

The invention provides an electrochemical device and an electronic device. The electrochemical device comprises an electrode assembly; the electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece, and the isolating membrane is arranged between the positive pole piece and the negative pole piece; the positive pole piece comprises a positive current collector, and the negative pole piece comprises a negative current collector; a first empty foil area is arranged on the inner side, facing a winding center, of an ending ring of a positive current collector, a resistance layer is arranged on the first empty foil area, thermal shrinkage gummed paper is arranged on a negative pole piece of the ending ring corresponding to the first empty foil area, and the area of the thermal shrinkage gummed paper accounts for 5%-60% of the area of the first empty foil area; and a notch area is arranged on the isolating membrane and coincides with the thermal shrinkage gummed paper, so that the thermal shrinkage gummed paper is in direct contact with the resistive layer. When the temperature of the electrochemical device is higher than 85 DEG C, the heat-shrinkable adhesive paper is heated and shrunk, so that the negative pole piece and the resistive layer are subjected to contact discharge, the state of charge of the electrochemical device is reduced, and the safety performance of the electrochemical device is improved.

Description

technical field [0001] The present application relates to the field of electrochemistry, in particular to an electrochemical device and an electronic device. Background technique [0002] Lithium-ion batteries have the advantages of high energy storage density, high open circuit voltage, low self-discharge rate, long cycle life, and good safety. They are widely used in various fields such as portable electric energy storage, electronic equipment, and electric vehicles. In the process of rapid development of lithium-ion batteries, users have put forward higher requirements for the comprehensive performance of lithium-ion batteries. [0003] Thermal runaway is one of the most serious safety problems of lithium-ion batteries. Thermal runaway can cause fires and explosions in lithium-ion batteries, seriously threatening the lives and property of users. Therefore, how to avoid thermal runaway and improve the safety performance of lithium-ion batteries has become an urgent proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/44C09J7/29
Inventor 胡克文陈军
Owner NINGDE AMPEREX TECH
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