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

Pending Publication Date: 2021-04-13
EVE HYPERPOWER BATTERIES INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The expansion films obtained in the above-mentioned patents all have good expansion effects, which can reduce the risk of metal drainage fluid breakage, but these base films with good expansion effects will shrink and deform after being baked at 45-60°C; therefore, When they are applied to lithium-ion batteries, when the core with the expansion film is baked at a high temperature of 80-90°C, the film width of the expansion film will become smaller due to shrinkage, resulting in the outflow of the electrolyte in the core of the lithium-ion battery. Cause the problem of unqualified products, and even have potential safety hazards

Method used

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

Examples

Experimental program
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Effect test

preparation example 1～5

[0055]A temperature resistant layer having a thickness of 25 μm, and the specific component is shown in Table 1, and the mass content of each component is "%";

[0056]Table 1

[0057]

[0058]

[0059]The preparation method includes the following steps:

[0060](1) Ethylene-acrylate copolymer (US DuPont, Elvaloy 2615ac) with xylene, the mass ratio of ethylene-acrylate copolymer and xylene is 1: 0.8, resulting in first glue; Styrene (China Petrochemical Co., Ltd., GPPS, 525) and toluene mixed, polystyrene and toluene mass ratio were 1: 0.8 to obtain a second glue;

[0061](2) First collapse and the first gel and the first glue, and the first glue, and the first gel, Catalyst (Qingdao Baichen New Material Technology Co., Ltd., Bisphenol A), Step (1) Elastic mixing to give a mixed rubber solution;

[0062](3) The mixture obtained by step (2) is coated on the surface of the release material, baked at 90 ° C, cooled at -30 ° C, remove the release material to obtain the temperature resistant layer.

Embodiment 1～5

[0064]High temperature resistant composite expansion film, schematic view of the cross sectionfigure 1As shown, including the expansion layer 1, the first adhesive layer 2, the temperature resistant layer 3, and the second adhesive layer 4.

[0065]Among them, polystyrene (Foshan DuPont Hung Ke Film Co., Ltd., 45μm OPS), 45 μm OPS 2, and a mass ratio of 1: 2: 4 of the material. Cream (Japan Electric Co., Ltd., 箐 箐), Curing Agent (Taiwan Changchun Chemical Co., Ltd., BR-20SE) and Acrylate (Japan Electric Co., Ltd., tape with acrylic glue) mixed polyacrylate slurry, The thickness of the temperature resistant layer 3 is 25 μm, which is a temperature resistant layer obtained by the preparation Example 1 to 5; the second adhesive layer 4 has a thickness of 3 μm, including a color cream having a mass ratio of 1: 2: 4 (Japan Electric Co., Ltd. Club, Phthalon Blue), Curing Agent (Taiwan Changchun Chemical Co., Ltd., BR-20SE) and Acrylate (Japan Electric Co., Ltd., tape with acrylic rubber) mix...

Embodiment 6

[0070]A high temperature resistant composite expansion film including an expansion layer having a thickness of 35 μm (polystyrene (Foshan DuPont Hung Ke Film Co., Ltd.), a first adhesive layer having a thickness of 2 μm (mass ratio 1: 3 : 6 Color cream (Japan Electric Co., Ltd., Blue), Curing Agent (Taiwan Changchun Chemical Co., Ltd., BR-20SE) and Polyacrylate (Japan Electric Co., Ltd., tape with acrylic glue) mixed Acrylate slurry), a temperature-resistant layer (prepared temperature layer obtained by Example 1) having a thickness of 20 μm and a second adhesive layer having a thickness of 2 μm (mass ratio 1: 3: 6 color cream (Japan Electric Co., Ltd. Club, Phthalon Blue), Curing Agent (Taiwan Changchun Chemical Co., Ltd., BR-20SE) and Polyacrylate (Japan Electric Co., Ltd., tape with acrylic glue), mixed polyacrylate pulping;

[0071]The preparation method is the same as in Example 1.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/29C09J7/30C09J133/04C08L25/06C08L23/08C08J5/18B32B37/12B32B37/10B32B37/26B32B38/16B32B38/10H01M10/0525H01M10/0587
CPCC09J7/29C09J7/30C09J133/04C08J5/18B32B37/1284B32B37/10B32B37/26B32B38/164B32B38/10H01M10/0525H01M10/0587C08J2325/06C08J2323/08C08J2425/06C08J2423/08C09J2425/006C09J2423/046C09J2433/00B32B2037/268Y02E60/10Y02P70/50
Inventor 梁玉典刘荣江黄德怀黄彬彬祝媛刘金成刘建华
Owner EVE HYPERPOWER BATTERIES INC
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