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Vacuum seal method of square shaped lithium ion secondary battery

A secondary battery and vacuum sealing technology, which is applied in the direction of secondary batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems that affect the development of lithium-ion batteries, battery performance degradation, battery swelling, etc.

Inactive Publication Date: 2006-07-05
TIANJIN LISHEN BATTERY
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AI Technical Summary

Problems solved by technology

[0002] With the development of miniaturization of portable electrical appliances, lithium-ion secondary batteries, one of the main sources of power, are also facing a trend of miniaturization. In the process of reducing battery volume, in order to obtain higher battery capacity, manufacturers The thickness of the shell wall is often reduced. If the method of directly sealing the battery under non-negative pressure after liquid injection is still used at this time, the problem of battery swelling caused by the gas generated during the charging process will also be highlighted. At the same time, due to the battery The problem of battery performance degradation caused by swelling will also affect the development of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Assemble 20 043048 batteries of 4mm×30mm×48mm in the same way, and inject the same electrolyte in the same way, and then divide the 20 batteries into two types, 10 of each type, denoted by A and B respectively.

[0009] Seal A directly, and after standing for 24 hours, conduct formation with a current of 0.1C (formation refers to charging with a small current and constant current to 4.2V, and then charging at a constant voltage of 4.2V to 20mA), and after standing for 48 hours, perform post-treatment (with 1C current to 3.0V, then constant current charge to 4.2V with 1C current, then constant voltage charge to 20mA at 4.2V, and then repeat this step once).

[0010] For B, let it stand for 4 hours first, then charge it at 0.1C for 1 hour, place the battery upright in a vacuum box, evacuate to -0.8MPa, keep the pressure for 1min, then release the pressure, then evacuate to -0.8MPa, and keep the pressure for 1min , and then close the liquid injection port under the negativ...

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Abstract

After charging liquid to square shaped lithium ion secondary battery, the method does not close down charge opening directly, instead charges up the battery in small current for a certain time. Next, the battery is placed in vacuum chamber, which is vacuumized to negative pressure; the negative pressure is maintained for a period of time; then, pressure is released. The said step is repeated for one or two times. The vacuum chamber is vacuumized to negative pressure again, and then the negative pressure is maintained for a period of time. Under condition of the negative pressure, the charge opening is closed down. The method lightens issue of battery ballooning caused by charging procedure as well as issue of lowered battery performance caused by battery ballooning.

Description

technical field [0001] The invention relates to a new sealing technology for a square lithium ion secondary battery. The prismatic lithium-ion secondary battery produced by this method can largely alleviate the problem of battery swelling caused in the charging process and some battery performance degradation problems caused by the battery swelling. technical background [0002] With the development of miniaturization of portable electrical appliances, lithium-ion secondary batteries, one of the main sources of power, are also facing a trend of miniaturization. In the process of reducing battery volume, in order to obtain higher battery capacity, manufacturers The thickness of the shell wall is often reduced. If the method of directly sealing the battery under non-negative pressure after liquid injection is still used at this time, the problem of battery swelling caused by the gas generated during the charging process will also be highlighted. At the same time, due to the ba...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M10/40H01M2/00H01M10/058H01M50/184
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 高俊奎王荣秦兴才
Owner TIANJIN LISHEN BATTERY
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