A kind of aluminum-plastic film and its preparation method and drop-proof lithium battery

A lithium battery and aluminum-plastic film technology, applied in the field of drop-proof lithium batteries, can solve the problems of easy impact and cracking at the corners, folding of the pole piece and diaphragm of the internal battery cell, and short-circuit fire, etc., to reduce folding and avoid Effect of deformation, good cushioning and protection

Active Publication Date: 2021-09-21
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, when the pouch battery falls to the ground or other places, its corners are easy to be impacted and broken, causing the pole pieces and diaphragms of the internal cells to turn over, causing problems such as short circuit and fire.

Method used

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  • A kind of aluminum-plastic film and its preparation method and drop-proof lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] figure 1 It is a schematic diagram of an aluminum-plastic film according to an embodiment of the present invention. Such as figure 1 As shown, the aluminum-plastic film includes adjacent aluminum-plastic film substrates and polymer layers, and the aluminum-plastic film substrate includes successively adjacent external resistance layers 1, the first adhesive bonding external resistance layer 1 and aluminum intermediate layer 2 Layer 51, aluminum intermediate layer 2, second adhesive layer 52 for bonding aluminum intermediate layer 2 and inner layer 3, inner layer 3, and polymer layer 4; wherein, the outer resistance layer 1 is a PET film with a thickness of 25 μm, and the first The adhesive layer 51 and the second adhesive layer 52 are polyurethane adhesives, the aluminum intermediate layer 2 is an aluminum foil with a thickness of 40 μm, the inner layer 3 is a cast polypropylene film with a thickness of 40 μm, and the polymer layer 4 is polymethacrylate Ester film.

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Embodiment 2

[0038] An aluminum-plastic film, the difference from Example 1 is that the material of the polymer layer is polyethyl methacrylate film.

Embodiment 3

[0040] An aluminum-plastic film, the difference from Example 1 is that the material of the polymer layer is polypropylmethacrylate film.

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Abstract

The invention discloses an aluminum-plastic film for improving the drop resistance performance of a lithium battery, a preparation method thereof, and a corresponding lithium battery. The aluminum-plastic film includes an aluminum-plastic film substrate and a polymer layer, the main material of the polymer layer is polymethacrylate compound, and the polymer layer is used to insulate the aluminum-plastic film substrate and the electric core. The polymethacrylate compound material is located on the inner surface of the aluminum-plastic film to form a stable protective layer. It has good thermal stability, hardness and rigidity at the same time. On the basis of ensuring that the electrical performance of the lithium battery is not affected , when the lithium battery is impacted by heavy objects, dropped from a low height, etc., it can play a better buffer and protection role, effectively improving the safety performance of the lithium battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an aluminum-plastic film, a preparation method thereof, and a drop-proof lithium battery. Background technique [0002] Soft-pack lithium-ion batteries are composed of aluminum-plastic film, batteries and electrolytes. They have the characteristics of light weight, large capacity, low internal resistance, high energy density, long cycle life, and stable discharge platform. They are favored by users at home and abroad. Soft-pack lithium battery products are therefore widely used in electric vehicles, mobile power supplies, digital electronic products, smart wearable products, electric toys, and many other fields. [0003] The aluminum-plastic film commonly used in existing soft-pack lithium batteries is roughly divided into three layers from the outside to the inside, namely, the outer resistance layer (generally the outer protective layer composed of nylon BOPA or PET), the barrier layer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/34B32B27/36B32B27/32B32B27/08B32B27/06B32B15/20B32B15/085B32B15/088B32B15/09B32B33/00H01M50/121H01M50/119H01M50/129H01M50/134B29C65/48B29L7/00B29L9/00
CPCY02E60/10
Inventor 潘珊珊
Owner HIGHPOWER TECH HUIZHOU
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