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Soft package battery interface improvement method

A soft-pack battery and interface technology, which is used in the manufacture of secondary batteries, non-aqueous electrolyte batteries, and electrolyte batteries, can solve the problems of inability to remove pole pieces and diaphragm bubbles, increase energy loss, increase battery process time and cost, etc. Achieve the effect of improving battery interface, promoting absorption, and smooth migration path

Inactive Publication Date: 2020-06-26
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the first three methods can promote the infiltration of the electrolyte and improve the battery interface, they increase energy loss and increase the battery manufacturing process time and cost. Although method ④ can increase the degree of bonding between the pole piece and the separator, it cannot remove The air bubble between the pole piece and the diaphragm will only roll the air bubble to the edge of the diaphragm

Method used

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  • Soft package battery interface improvement method
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  • Soft package battery interface improvement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Take the finished battery 1 with a size of 229mm*269mm after Degas, and place it on the sample table of an air-coupled ultrasonic machine to test the degree of adhesion between the pole piece and the diaphragm in the battery, and confirm the state of its interface;

[0051] 2. Put the battery after the ultrasonic measurement on the rolling tool, set the pressure of 0.1Mpa and the running speed of the roller to 500mm / s, press the start buttons on the left and right sides of the rolling machine, and let the battery reciprocate along the direction of the ear 2 Press it once, then turn the cell over 180°, and use the same parameters to roll it back and forth again;

[0052] 3. Place the rolled battery on the sample table of the air-coupled ultrasonic machine, and check the degree of adhesion between the pole piece and the diaphragm in the battery again to confirm the degree of adhesion between the pole piece and the diaphragm;

[0053] 4. Disassemble and compare the roll...

Embodiment 2

[0056] 1. Take the finished battery 1 with a size of 229mm*269mm after Degas, and place it on the sample table of an air-coupled ultrasonic machine to test the degree of adhesion between the pole piece and the diaphragm in the battery, and confirm the state of its interface;

[0057] 2. Put the battery after the ultrasonic measurement on the rolling tool, set the pressure of 0.3Mpa and the running speed of the roller to 200mm / s, press the start button on the left and right sides of the rolling press, and let the battery roll back and forth along the direction of the ear 2 Press it once, then turn the cell over 180°, and use the same parameters to roll back and forth again;

[0058] 3. Place the rolled battery on the sample table of the air-coupled ultrasonic machine, and check the degree of adhesion between the pole piece and the diaphragm in the battery again to confirm the degree of adhesion between the pole piece and the diaphragm;

[0059] 4. Disassemble and compare the ro...

Embodiment 3

[0062] 1. Take the finished battery 1 with a size of 229mm*269mm after Degas, and place it on the sample table of an air-coupled ultrasonic machine to test the degree of adhesion between the pole piece and the diaphragm in the battery, and confirm the state of its interface;

[0063] 2. Put the battery after ultrasonic measurement on the rolling tool, set the pressure of 0.4Mpa and the running speed of the roller to 300mm / s, press the start button on the left and right sides of the rolling machine, and let the battery roll back and forth along the direction of the ear 2 Press it once, then turn the cell over 180°, and use the same parameters to roll back and forth again;

[0064] 3. Place the rolled battery on the sample table of the air-coupled ultrasonic machine, and check the adhesion degree of the pole piece and the diaphragm in the battery again to confirm the degree of adhesion between the pole piece and the diaphragm;

[0065] 4. Disassemble and compare the rolled finis...

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Abstract

The invention provides a soft package battery interface improvement method. The method comprises the following steps of 1, processing a lithium ion soft package battery into a finished battery throughDegas; 2, detecting the fitting degree of a pole piece and a diaphragm in the battery on an air coupling ultrasonic machine sample table; 3, controlling a rolling roller to roll along the tab side ofthe finished battery; 4, detecting the fitting degree of the pole piece and the diaphragm by using an air coupling ultrasonic machine testing method and disassembling the battery, and comparing the interface fitting degree after rolling with the interface fitting degree before rolling; and 5, obtaining data through a battery cycle test, and discovering that the performance of the finished batteryrolled along the tab side is good after Degas. According to the invention, bubbles between the pole piece and the diaphragm in the finished battery are effectively removed, so that the pole piece andthe diaphragm can be fitted better, the contact area between the electrolyte and the pole piece and the diaphragm is increased, and the absorption of the electrolyte is promoted, and accordingly thebattery interface is effectively improved and the performance of the battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to a method for improving the interface of a pouch battery. Background technique [0002] In today's situation of resource shortage and increasingly serious environmental pollution problems, electric vehicles have become the development trend of the automobile industry recognized by the international community, and lithium-ion soft pack power batteries, as energy storage devices for power vehicles, are the core technology for the development of electric vehicles . Therefore, lithium-ion power batteries not only require sufficient energy density to meet a certain mileage, but also require a long enough life to meet customer needs. In order to meet the demand for high energy density, many researchers start with battery materials, especially to increase the areal density and compaction density of the material. However, when the areal density and compaction density are increased, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李苗苗张庭旭许少辉于海彬卫晓燕王文彬
Owner TIANJIN ENERGIES