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A battery diaphragm material, a battery bare cell and an electrochemical device

A battery diaphragm and diaphragm technology, which is applied in the field of battery bare cells, electrochemical devices, and battery diaphragm materials, can solve problems such as low X-ray absorption and battery diaphragm overhang detection failure, and achieve the effect of eliminating safety risks

Active Publication Date: 2022-05-17
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing battery separator materials have little absorption of X-rays, which leads to the failure of the overhang detection of the battery separator.

Method used

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  • A battery diaphragm material, a battery bare cell and an electrochemical device
  • A battery diaphragm material, a battery bare cell and an electrochemical device
  • A battery diaphragm material, a battery bare cell and an electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Take 80g of barium sulfate and 900g of water and disperse together for 1 hour to form a dispersion, then add 20g of polyacrylic acid to the dispersion, and then disperse for 30 minutes to prepare a polymer slurry containing the barium sulfate and coating material water-based polymer battery separator material.

[0061] The water-based polymer battery separator material is spray-coated on one surface of a PE base film 101 with a thickness of 12 μm, including one of the inner surface and the outer surface, and the water-based polymer battery separator material is in the The coating amount on the surface of the PE base film 101 is 0.2g / m 2 , with a thickness of 0.5 μm, so that a water-based polymer-coated separator 102 is prepared on the PE base film 101 , and the PE-based film 101 and the water-based polymer-coated separator 102 form a battery separator 110 . Since the battery separator 110 contains the barium sulfate which has a strong absorption of X-rays, the prepared...

Embodiment 2

[0064] Get 20g of barium sulfate, 330g of aluminum oxide and 600g of water and disperse together for 2 hours to form a dispersion, then add 2g of sodium polyacrylate, 5g of sodium carboxymethyl cellulose, 40g of polymethylacrylate and 3g of 3-glycidyl ether oxypropyl trimethoxysilane, and stirred successively for 60 minutes, 60 minutes, 30 minutes and 10 minutes to prepare the water-based ceramic battery diaphragm material comprising the barium sulfate and the coating material as ceramic slurry .

[0065] The water-based ceramic battery separator material is coated on one surface of a PP base film 103 with a thickness of 16 μm by gravure coating, including one of the inner surface and the outer surface, and the water-based ceramic battery separator material is in the The coating amount on the surface of the PP base film 103 is 7g / m 2 , with a thickness of 4 μm, so that a water-based ceramic coating diaphragm 104 is prepared on the PP base film 103, and the PP base film 103 an...

Embodiment 3

[0068] Get 50g of polyvinylidene fluoride, 1g of sodium alginate and 946g of water and disperse together for 3 hours to form a dispersion, then add 3g of 3-glycidyl etheroxypropyl trimethoxysilane to the dispersion, and stir for 30 minutes to prepare the polymer slurry.

[0069] The polymer slurry is coated on the inner and outer surfaces of the battery separator 120 prepared in Example 2 by wire bar coating, and the polymer slurry is coated on each side of the surface of the battery separator 120 The coating amount is 1g / m 2 , with a thickness of 3 μm, so that a polymer slurry separator 105 is prepared on the battery separator 120, and the polymer slurry separator 105 and the battery separator 120 together form a composite battery separator 230. Since the composite battery separator 230 includes the battery separator 120 which has a strong absorption of X-rays, the prepared composite battery separator 230 has a self-identification function. like image 3 Shown is a schemat...

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Abstract

The invention provides a battery diaphragm material containing developer barium sulfate, a battery diaphragm and an electrochemical device, so that the battery diaphragm has a self-identification function during X-ray detection, thereby serving as the basis for judging the safety performance of the battery and reducing the risk of judging the bare battery. The difficulty of overhanging the cell ensures that the positive electrode and the negative electrode are separated, so that the safety performance of the battery bare cell flowing into the next process is ensured, and the subsequent electrochemical device is free from battery safety hazards caused by the dislocation of the battery diaphragm. question.

Description

technical field [0001] The invention belongs to the field of battery diaphragms, and relates to a battery diaphragm material, a battery bare cell and an electrochemical device. Background technique [0002] Lithium-ion batteries have been widely used in electronic products such as portable phones, digital cameras, notebook computers, power tools, equipment such as electric vehicles. [0003] Lithium-ion batteries generally include four basic components: positive and negative pole pieces, electrolyte, diaphragm and casing. Among them, the diaphragm, as one of the four key materials of lithium-ion batteries, is to connect and separate the positive and negative pole pieces of lithium-ion batteries. The material is an insulator of electrons, but allows lithium ions to pass through, which can prevent the short circuit of the positive and negative electrodes, and can also block the current conduction in the lithium-ion battery by closing the pores when the battery is overheated. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/446H01M50/449H01M50/403H01M10/0525H01M50/431
CPCH01M10/0525H01M50/431H01M50/446H01M50/449Y02E60/10
Inventor 程跃陈永乐何方波王治学黄灿灿
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD