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Method for improving hardness and toughness of flexibly-packaged battery

A soft-pack battery and hardness technology, which is applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, climate sustainability, etc., can solve problems such as scratches, poor hardness of aluminum-plastic film, insufficient hardness and toughness of aluminum-plastic film, etc., to achieve Improved vibration resistance, high safety performance, and high hardness

Inactive Publication Date: 2012-09-05
珠海格力新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness of the aluminum-plastic film on the soft-packed lithium-ion battery is too poor, resulting in the battery being easily deformed, prone to pits, wrinkles, scratches and other poor appearance, and the aluminum-plastic film is easily damaged
Especially in the field of power technology, the hardness and toughness of aluminum-plastic films are not enough, and they cannot withstand long-term vibration and impact, which limits the development of soft-pack lithium-ion batteries in this field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Pour 400 grams of methanol into the mixing tank and stir, adjust the speed of the mixer to 1000rpm, and stir for 4 minutes; slowly add 110 grams of alcohol-soluble polyacrylic acid resin, and stir for 15 minutes (minutes); add 1 gram of defoamer and 1.5 grams of Leveling agent; then continue to add methanol to dilute until the solution can be sprayed with a spray gun, and then stir for 30 minutes to obtain the required resin solution.

[0021] Spray the prepared resin solution on the surface of the soft-packed lithium-ion battery with a spray gun; bake the soft-packed lithium-ion battery in an oven at 85°C for 4 hours under vacuum and then the resin will dry; the measured thickness is 20 μm, tested according to GB / T 6739-1996 Its pencil hardness, the result is H.

Embodiment 2

[0023] Mix 900 grams of ethanol and 100 grams of propylene glycol, take 400 grams of the mixed solution and stir on a variable speed mixer, adjust the speed to 1200 rpm, and stir for 3 minutes; slowly add 80 grams of rosin modified alkyd resin, and stir for 35 minutes; add 1.3 grams of Defoamer and 2.0 grams of leveling agent; then continue to add the mixed solution of ethanol and propylene glycol to dilute until it can be sprayed with a spray gun, and then stir for 20 minutes to obtain the required resin solution.

[0024] Spray the prepared resin solution on the surface of the pouch battery with a spray gun; vacuum bake the lithium-ion battery in an oven at 85°C for 4 hours, and then the resin will dry. The measured thickness is 50 μm, and the pencil hardness is tested according to GB / T 6739-1996, and the result is 2H.

Embodiment 3

[0026] Pour 400 grams of ethanol into the mixing tank and stir, adjust the speed of the mixer to 860 rpm, and stir for 5 minutes; slowly add 90 grams of alcohol-soluble polyacrylic acid resin, and stir for 15 minutes; add 1.2 grams of defoamer and 2.0 grams of leveling agent to the solution; then Continue to add ethanol to dilute until the solution can be sprayed with a spray gun, and then stir for 45 minutes to obtain the required resin solution.

[0027] Spray the prepared resin solution on the surface of the soft-pack lithium-ion battery with a spray gun; bake the lithium-ion battery in an oven under vacuum at 85°C for 4 hours, and then the resin will dry; the measured thickness is 23 μm, and the pencil is tested according to GB / T 6739-1996 Hardness, the result is H.

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PUM

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Abstract

The invention discloses and provides a method capable of improving wrinkle-resistant capability of an ultrathin battery greatly. The method provided by the invention comprises the following steps: taking an alcohol or ketone matter as a solvent, adding one kind or multiple kinds of alcohol soluble or ketone soluble resin slowly into the solvent according to certain proportion at the normal temperature under the condition of high-speed stirring, wherein stirring times lasts for 15-60 minutes; adding a defoaming agent and a flatting agent to the mixed solution and stirring uniformly; adding alcohol or ketone solvent continuously so as to adjust the viscosity of the mixed solution, and stirring for 10-60 minutes, thus obtaining a resin solution; uniformly spraying the obtained resin solution between an ultrathin battery electrode plate and an aluminum plastic film by a spraying gun; and standing the ultrathin battery processed by the above steps at the normal temperature or standing and drying in an anaerobic sealed vacuum box at a high temperature, wherein the drying time depends on the thickness of the sprayed resin. The method capable of improving wrinkle-resistant capability of the ultrathin battery greatly provided by the invention can be widely applied to the field of manufacturing technology of lithium batteries.

Description

technical field [0001] The invention relates to a method for improving the hardness and toughness of a pouch battery. Background technique [0002] Compared with metal shell or plastic shell batteries, soft pack lithium ion batteries have good safety performance, thin thickness, flexible design and lower cost, so they are favored by users at home and abroad. However, the hardness of the aluminum-plastic film on the soft-packed lithium-ion battery is too poor, so the battery is easily deformed, and the appearance is prone to pits, wrinkles, scratches, etc., and the aluminum-plastic film is easily damaged. Especially in the field of power technology, the hardness and toughness of aluminum-plastic films are not enough, and they cannot withstand long-term vibration and impact, which limits the development of soft-pack lithium-ion batteries in this field. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficienc...

Claims

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Application Information

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IPC IPC(8): C09D161/06C09D167/08C09D161/24C09D129/14C09D133/02H01M10/058
CPCY02E60/10Y02P70/50
Inventor 许名飞谌名昭李键曾志雄
Owner 珠海格力新能源科技有限公司
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