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A kind of electrochemical device and electronic device

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

Active Publication Date: 2022-06-21
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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  • A kind of electrochemical device and electronic device
  • A kind of electrochemical device and electronic device
  • A kind of electrochemical device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0059]

[0060] The negative electrode active material graphite, conductive agent conductive carbon black, and binder styrene-butadiene rubber (SBR) were mixed in a mass ratio of 96:1.5:2.5, and then deionized water was added as a solvent to prepare a negative electrode slurry with a solid content of 70%. ingredients and mix well. The negative electrode slurry was uniformly 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 plate was 16.8 g / cm 2 . Drying at 110° C. to obtain a negative electrode piece coated with negative electrode slurry on one side. After that, the above steps are repeated on the other surface of the negative electrode pole piece to obtain a negative electrode pole piece coated with negative electrode slurry on both sides. After the coating is completed, the negative pole piece is cold-pressed and cut into a size of 74.8mm...

Embodiment 1-2 to Embodiment 1-6

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

Embodiment 2-1 to Embodiment 2-12

[0079] Except that the relevant preparation parameters were adjusted according to Table 2, the rest were the same as those in Example 1-1.

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Abstract

The present application provides an electrochemical device and an electronic device. The electrochemical device includes an electrode assembly; the electrode assembly includes a positive electrode piece, an isolation film and a negative electrode piece, and the isolation film is disposed between the positive electrode piece and the negative electrode piece; the positive electrode piece The sheet contains the positive electrode current collector, and the negative electrode sheet contains the negative electrode current collector; the positive electrode current collector closing circle is provided with a first empty foil area facing the inside of the winding center, and a resistance layer is set on the first empty foil area. Heat-shrinkable tape is set on the negative electrode piece of the closing ring, and the area of ​​the heat-shrinkable tape accounts for 5% to 60% of the area of ​​the first empty foil area; a gap area is set on the isolation film, and the gap area overlaps with the heat-shrinkable tape to allow the heat shrinkage The tape is in direct contact with the resistive layer. When the temperature of the electrochemical device is higher than 85°C, the heat shrinkable tape shrinks due to heat, causing contact discharge between the negative electrode piece and the resistive layer, reducing the state of charge of the electrochemical device, thereby improving the safety performance of the electrochemical device.

Description

Technical field [0001] The present application relates to the field of electrochemistry, and 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 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 issues of lithium-ion batteries. Thermal runaway can cause lithium-ion batteries to catch fire and explode, seriously threatening the lives and property safety of users. Therefore, how to avoid thermal runaway and improve the safety performance of lithium-ion batteries has become an urgent prob...

Claims

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Application Information

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