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Lithium ion battery diaphragm, lithium ion battery and power device

A lithium-ion battery and separator technology, applied in the field of lithium-ion batteries, power devices, and lithium-ion battery separators, can solve problems such as unsafe behavior of lithium-ion batteries

Pending Publication Date: 2022-04-01
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Research shows that overcharging is a major risk factor for unsafe behavior in lithium-ion batteries

Method used

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  • Lithium ion battery diaphragm, lithium ion battery and power device
  • Lithium ion battery diaphragm, lithium ion battery and power device

Examples

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preparation example Construction

[0030] According to some embodiments of the present invention, the preparation method of the lithium-ion battery separator is not particularly limited, specifically to the present invention, the preparation of the lithium-ion battery separator may include the following steps: (1) mixing inorganic substances, deionized water and a dispersant (2) adding the binder and wetting agent to the mixed liquid described in step (1), and stirring to obtain the slurry; (3) coating the slurry on the base film, drying, A lithium-ion battery separator is obtained.

[0031] In another aspect of the present invention, a lithium ion battery is provided, the lithium ion battery includes the aforementioned lithium ion battery separator. According to some specific embodiments of the present invention, the type of the battery is not particularly limited, preferably a square battery or a pouch battery. After using the above-mentioned lithium-ion battery separator, this type of battery can decompose a...

Embodiment 1

[0034] (1) Mix calcium carbonate, deionized water and ammonium polyacrylate dispersant (Shanghai Ruigu, LIB-200) to obtain a mixed liquid;

[0035] (2) CMC glue is added in the above-mentioned mixed liquid;

[0036] (3) Add PAA and acetylene glycol ethoxy compound wetting agent (Shanghai Ruigu, LIB-300) into the mixed liquid described in step (2), and stir to obtain an inorganic coating slurry;

[0037] (4) Coating the slurry on the polyethylene-based film and drying to obtain a lithium-ion battery separator.

[0038] (5) The above separator is made into a square lithium ion battery.

Embodiment 2

[0040] (1) Mix magnesium carbonate, deionized water and ammonium polyacrylate dispersant (Shanghai Ruigu, LIB-200) to obtain a mixed liquid;

[0041] (2) CMC glue is added in the above-mentioned mixed liquid;

[0042] (3) Add PAA and acetylene glycol ethoxylate wetting agent (Shanghai Ruigu, LIB-300) into the mixed liquid described in step (2), and stir to obtain the inorganic coating slurry;

[0043] (4) Coating the slurry on the non-woven fabric base film and drying to obtain a lithium-ion battery separator.

[0044] (5) The above separator is made into a square lithium ion battery.

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Abstract

The invention provides a lithium ion battery diaphragm, a lithium ion battery and a power device, the lithium ion battery diaphragm comprises a base membrane, at least part of the surface of the base membrane is provided with an inorganic coating, the inorganic coating comprises an inorganic substance, and the inorganic substance can be decomposed to generate gas. Therefore, the internal pressure of the battery cell is increased by the generated gas, and when the pressure is increased to a certain degree, the pressure valve or the outer package can be broken through, so that the heat in the battery cell is reduced, the occurrence of thermal runaway is reduced, the overcharge capacity of the lithium ion battery is improved, and the safety of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular, to a lithium ion battery diaphragm, a lithium ion battery and a power device. Background technique [0002] As the world's energy becomes increasingly tense and international oil prices continue to rise, electric vehicles and hybrid vehicles will become important means of transportation in the future, and lithium-ion batteries have attracted much attention as candidate power sources. Safety is currently the most critical issue restricting the application of power lithium-ion batteries. Studies have shown that overcharging is the main risk factor leading to unsafe behavior of lithium-ion batteries. When the battery is overcharged, the battery voltage will quickly rise to the decomposition potential of the electrolyte, triggering a series of exothermic reactions, leading to thermal runaway inside the battery, explosion, fire and other safety accidents. When overchargin...

Claims

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Application Information

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IPC IPC(8): H01M50/449H01M50/431H01M10/0525
CPCY02E60/10
Inventor 袁园杨鹏里胡伟东胡朝帅
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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