High-temperature-resistant composite expansion film as well as preparation method and application thereof

A technology of high temperature resistance and temperature resistance, which is applied in the field of high temperature resistant composite expansion film and its preparation, can solve the problems of shrinking expansion film width, potential safety hazards, unqualified products, etc., and achieve excellent temperature resistance and high expansion, Guarantee the effect of high temperature resistance and good temperature resistance
CN112646505APending Publication Date: 2021-04-13EVE HYPERPOWER BATTERIES INC +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
EVE HYPERPOWER BATTERIES INC
Publication Date
2021-04-13

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Abstract

The invention provides a high-temperature-resistant composite expansion film as well as a preparation method and application thereof. The high-temperature-resistant composite expansion film comprises an expansion layer, a first bonding layer, a temperature-resistant layer and a second bonding layer which are sequentially arranged; and the temperature-resistant layer is made of a combination of polystyrene and an ethylene-ethyl acrylate copolymer. By selecting the combination of polystyrene and ethylene-ethyl acrylate copolymer with better expansion effect and temperature resistance as the temperature-resistant layer, the high-temperature-resistant composite expansion film has excellent expansion performance and high-temperature resistance, and can fill the gap between the battery cell and the shell after being soaked in an electrolyte and expanded, and the anti-vibration and anti-shaking stability of the battery is improved; and no shrinkage is generated under high-temperature baking at 90 DEG C, so that the safety of the battery can be ensured.
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Description

Technical field

[0001] The present invention belongs to the technical field of lithium ion batteries, and in particular, the present invention relates to a high temperature resistant composite expansion film and a preparation method thereof.Background technique

[0002] Cylindrical steel shell-type lithium ion battery is the most widely used in lithium ion batteries, which has been widely used in daily life, and cylindrical steel shell-type lithium-ion batteries are often fitted in various device devices, terminal users. There is a phenomenon that frequently vibration shakes when operating the device; due to the lithium battery carrying the active material, there is a certain self-weight, and is electrically connected to the outer casing by the metal conductive drainage body, and therefore, in the process of use, along with The increase in the number of vibration shaking may occur, and the metal drainage is broken, the battery failure, thereby causing a lot of safety hazards.

[0003] In orde...

Claims

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