An isolation film and an electrochemical energy storage device

A technology of isolation membrane and isolation area, applied in electrochemical generators, separators/films/diaphragms/spacer elements, circuits, etc., can solve the problems of battery thermal runaway, lithium precipitation, explosion, etc., and improve overcharge safety. Effect

Active Publication Date: 2021-12-21
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the limiting mechanism fails and the voltage exceeds its safe voltage, there will be problems of anode lithium deposition, cathode oxygen release, and battery heat generation, which will seriously cause thermal runaway inside the battery, causing serious safety accidents such as fire and explosion.

Method used

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  • An isolation film and an electrochemical energy storage device
  • An isolation film and an electrochemical energy storage device
  • An isolation film and an electrochemical energy storage device

Examples

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preparation example Construction

[0061] The embodiment of the present application also relates to a method for preparing a temperature-sensitive material, specifically: dissolving the main material and the plasticizing material in an organic solvent in proportion, and adding other additives in proportion, and mixing them uniformly to obtain a temperature-sensitive material glue; or Continue to coat the temperature-sensitive material glue on the release film to prepare a thickness of 1 μm to 20 μm to obtain a temperature-sensitive adhesive film. Among them, the organic solvent is preferably toluene.

[0062] The preparation method of the isolation film is as follows:

[0063] The first method: put the temperature-sensitive material glue in the hot-melt glue dispenser, and apply the prepared temperature-sensitive glue on the existing isolation film (that is, the present invention) by dispensing glue in the process of cell winding On at least one side of the isolation area in the application example), the overl...

Embodiment

[0072] 1. Preparation of isolation membrane:

[0073] 1.1 Preparation of temperature-sensitive materials:

[0074] The first method: dissolve the main material and plasticizing material of the temperature-sensitive material in toluene according to the weight percentage, add fillers and / or conductive particles in proportion, mix evenly, and coat it on the PET release film through a coating machine. Prepare a certain thickness to obtain a temperature-sensitive adhesive film.

[0075] The second method: dissolve the main material and plasticizing material of the temperature-sensitive material in toluene according to the weight percentage, mix evenly, and dry (or use blending equipment such as an internal mixer to blend at high temperature), and the temperature Sensitive glue.

[0076] The preparation method of the isolation film of the embodiment of the present application is:

[0077] The first method: cut the obtained temperature-sensitive adhesive film into a width of 3-6 m...

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Abstract

This application relates to the field of energy storage materials, in particular, to an isolation and membrane electrochemical energy storage device. In the isolation film isolation area and the temperature sensitive area of ​​the present application, the sensitive area is connected to at least one side of the isolation area, the isolation area is used to isolate the positive electrode sheet and the negative electrode sheet, and the temperature sensitive area is used to form micro short circuit. The temperature sensitive area of ​​this application is used to form a micro-short circuit after the temperature of the cell rises to a threshold value. When the temperature is higher than the threshold value, the temperature sensitive area will soften and flow, causing the positive and negative electrodes in the electrochemical energy storage device to be in local areas. Contact is formed, that is, a micro-short circuit between the positive and negative electrodes is formed, thereby improving overcharge safety.

Description

technical field [0001] The present application relates to the field of energy storage materials, in particular, to an isolation film and an electrochemical energy storage device. [0002] technical background [0003] Electrochemical energy storage devices, such as secondary batteries, have frequent charging and discharging processes during use. During the charging process, there is a limited voltage, and when the voltage exceeds this voltage, it is overcharged. Overcharging will lead to lithium deposition at the anode, oxygen release at the cathode, and heat generation in the battery cell. In serious cases, it will cause a large amount of heat inside the battery and cause thermal runaway. The battery cell may catch fire or even explode, seriously affecting the use and customer safety. [0004] Although there is an anti-overcharge mechanism in the battery pack, it is difficult to ensure that all batteries will not be overcharged during their entire life due to the long cycle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/414H01M50/417H01M50/426H01M50/446H01M50/431H01M50/443H01M50/403H01M50/406H01M10/48H01M10/42
CPCH01M10/486H01M10/4235H01M50/403H01M50/409Y02E60/10
Inventor 钟泽戴璐黄婷魏奕民柳娜梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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