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Packaging method of soft-packaged lithium ion battery

A technology of lithium-ion batteries and packaging methods, which is applied in the manufacture of secondary batteries, non-aqueous electrolyte batteries, electrolyte batteries, etc., can solve the problems of difficult extraction of micro-bubbles, leakage of electrolyte, and no mention of micro-bubbles, etc., to achieve improved Packaging efficiency and packaging quality, improving yield and battery quality, and improving electrochemical performance

Inactive Publication Date: 2015-07-08
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The packaging of soft-pack batteries is a key factor affecting the quality of lithium-ion batteries. At present, most battery manufacturers directly vacuumize the soft-pack lithium-ion batteries after formation, which may easily cause electrolyte leakage and make it difficult to maintain the electrolyte in soft-pack batteries. At the same time, due to the low degree of vacuum and unstable vacuum, it is difficult to extract the micro-bubbles in the soft pack, and they remain in the soft pack battery, which seriously affects the electrochemical performance of the battery cycle.
Although there are new packaging methods in China to improve the packaging effect, such as the patent CN201010261953.5, which adopts a step-by-step incremental vacuuming method to evacuate, the electrolyte can be returned to the battery body, and the electrolyte is not easy to be drawn out during vacuuming, thus effectively reducing The battery outer packaging material is polluted and corroded by the electrolyte, which significantly improves the consistency of battery performance, but there is no mention of the removal method of microbubbles in the flexible packaging

Method used

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  • Packaging method of soft-packaged lithium ion battery
  • Packaging method of soft-packaged lithium ion battery
  • Packaging method of soft-packaged lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Depend on figure 1 , figure 2 Known, a kind of encapsulation method of flexible packaging lithium-ion battery comprises the following steps: first put the battery 2 to be tested into the air bag and place it on the battery fixing splint 3 in the final sealing machine with the air bag facing up. ; Heating the battery fixing splint 3 and the battery to be tested at 2 to 50°C; then, place the packaged battery 2 and the battery fixing splint 3 in the air extraction device 4, and send them together into the vacuum chamber 3, and pierce the air bag with a bayonet. And adopt vacuum pump 6 and vacuum buffer device 5 to control the degree of vacuum and the vacuum time in the vacuum chamber 1, vacuumize the vacuum chamber 1 with five times of vacuuming, wherein the vacuuming mode is: the first time of vacuuming is 30 seconds, The standing time is 60 seconds, the second vacuuming time is 28 seconds, the standing time is 56 seconds, the third vacuuming time is 26 seconds, the sta...

Embodiment 2

[0027] First put the packaged battery 2 into the air bag and clamp it on the battery fixing splint 3 in the air pump 4 with the air bag facing upward; heat the battery fixing splint 3 to 40°C; then, pack the battery 2 and the battery The fixed splint 3 is placed in the air pumping device 4, and one piece is sent into the vacuum chamber 3, the air bag is pierced with the bayonet 4, the vacuum degree and time are controlled by the vacuum pump 6 and the vacuum buffer device 5, and the vacuum chamber 1 is pumped three times. Vacuuming in vacuum mode, where the vacuuming method is: the first vacuuming time is 20 seconds, the resting time is 100 seconds, the second vacuuming time is 19 seconds, the resting time is 96 seconds, and the vacuuming time is decreased by 1 second in turn , the resting time is 5 times of the vacuuming time, and finally, the packaged battery 2 is heat-sealed with a soft-seal heat-seal jig, thereby completing the exhaust packaging process of the battery to be ...

Embodiment 3

[0029] First put the packaged battery 2 into the air bag and clamp it on the battery fixing splint 3 in the air pump 4 with the air bag facing up; heat the battery fixing splint 3 to 80°C; then, pack the battery 2 and the battery The fixed splint 3 is placed in the air pumping device 4, and one piece is sent into the vacuum chamber 3, the air bag is pierced with a bayonet, and the vacuum pump 6 and the vacuum buffer device 5 are used to control the vacuum degree and time, and the vacuum chamber 1 is vacuumed three times. Vacuuming method, wherein the vacuuming method is: the first vacuuming time is 20 seconds, the resting time is 100 seconds, the second vacuuming time is 19 seconds, the resting time is 96 seconds, and the vacuuming time is decremented by 1 second. The resting time is 5 times of the vacuuming time, and finally, the battery 2 is heat-sealed with a soft-sealing heat-sealing jig, thereby completing the exhaust packaging process of the battery to be packaged.

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Abstract

A packaging method of soft-packaged lithium ion battery comprises following steps: (1) fixing a to-be-test battery; (2) heating the to-be-test battery apparatus; (3) punching the to-be-test battery and exhausting gas from the to-be-test battery and (4) packaging the to-be-test battery. In the invention, by means of addition of a vacuum buffer control apparatus, vacuumizing time and vacuumizing degree can be accurately controlled, thereby increasing the qualification rate and the quality of the battery during the packaging process. Meanwhile, by means of a step-type sine vacuumizing method, not only is electrolyte free from being leaked outwardly but also the micro bubble content in the soft-packaged battery can be further reduced and the battery packaging quality can be improved due to the bubble distribution characteristics of the soft-packaged lithium ion battery during the vacuumizing process.

Description

technical field [0001] The invention relates to a packaging method for a soft-packaged lithium-ion battery, in particular to a method for reducing the amount of microbubbles in the soft-packaged battery. Background technique [0002] Flexible packaging lithium-ion batteries have attracted more and more attention from manufacturers because of their high energy density and good cycle life. The packaging of soft-pack batteries is a key factor affecting the quality of lithium-ion batteries. At present, most battery manufacturers directly vacuumize the soft-pack lithium-ion batteries after formation, which may easily cause electrolyte leakage and make it difficult to maintain the electrolyte in soft-pack batteries. At the same time, due to the low degree of vacuum and unstable vacuum, it is difficult to extract the micro-bubbles in the soft pack, and they remain in the soft pack battery, which seriously affects the electrochemical performance of the battery such as cycle. Altho...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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