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Design method of polymer soft package battery cell air bag

A polymer and cell technology, applied in electrical components, circuits, lithium batteries, etc., can solve the problems of aluminum-plastic film waste, poor sealing, affecting the second sealing of cells, etc., to reduce packaging costs, reduce waste, and avoid flatulence. Effect

Active Publication Date: 2020-04-10
东莞维科电池有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional air bag design relies on the experience of engineers, and the width of the air bag is estimated according to the design capacity of the battery cell, which cannot be designed quantitatively, so there are the following problems: (1) When the air bag design is too large, it will cause waste of aluminum-plastic film , increase the material cost of battery packaging; (2) When the design of the air bag is insufficient, it will affect the second seal of the battery, causing poor sealing, causing the battery to bloat during use or the appearance of the battery to be poor
[0004] CN 207009574 U discloses a soft package lithium-ion battery air bag, including a first body and a second body that are integrally connected and communicated with each other, the first body is provided with a main pit for accommodating batteries, and the second The opening of the main body is provided with a sealing structure, and the sealing structure includes an upper sealing strip and a lower sealing strip embedded in each other; the above-mentioned scheme provides a structure of a cell air bag, but does not provide a suitable polymer soft-pack battery. The design method of the cell cannot solve the technical problem of poor cell seal caused by the inappropriate design of the cell air bag, nor can it achieve the purpose of saving cell packaging materials

Method used

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  • Design method of polymer soft package battery cell air bag
  • Design method of polymer soft package battery cell air bag
  • Design method of polymer soft package battery cell air bag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Design method of polymer soft-pack battery cell air bag:

[0070] The polymer soft-packed battery cell air bag described in this embodiment does not include punching pits;

[0071] The parameters of the polymer soft-pack battery cell (625885-5Ah) used in this embodiment are: cell height L=84.5mm, top seal edge width w 0 =2.5mm; the design capacity C of the cell is 5.15Ah; α is 15°; then the height of the air bag l=L-w 0 =82mm; where the width of the two edge banding areas a=5mm, and the width of the simple edge banding area c=7mm;

[0072] Measurement of gas production coefficient k: Using the same chemical system cell 605090-5Ah (design capacity 5.2Ah), measure the gas production coefficient k of formation: use the drainage method to measure the volume of the battery before formation is 30.57ml, and use the drainage method to measure the electricity after formation The core volume is 40.86ml, and the gas production coefficient of the system k=(40.86-30.57) / 5.2=1.979m...

Embodiment 2

[0076] Design method of polymer soft-pack battery cell air bag:

[0077] The polymer soft-packed battery cell 625885-5Ah air bag in this embodiment includes a punching pit, and the volume of the punching pit is V'=3mL;

[0078] The parameters of the soft pack cell used in this embodiment are: cell height L=84.5mm, top seal width w 0 =2.5mm; the design capacity C of the cell is 5.15Ah; α is 15°; then the height of the air bag l=L-w 0 =82mm; where the width of the two edge banding areas a=5mm, and the width of the simple edge banding area c=7mm;

[0079] The test method of the cell formation gas production coefficient k is exactly the same as that in Example 1;

[0080] Substituting the above parameters into the calculation formula of the total width of the polymer soft-packed electric core air bag is obtained, wherein j=1, the total width of the air bag in the present embodiment:

[0081]

[0082] The schematic diagram of the formation process of the polymer soft-packed b...

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Abstract

The invention relates to a design method of a polymer soft package battery cell air bag. The method comprises: measuring a formation gas production coefficient of a battery cell, calculating then to obtain the width of the air bag of the effective air storage space, and then achieving the design of the polymer soft package battery cell air bag. Waste of an aluminum-plastic film or influence on secondary packaging of the battery cell due to improper design of an air bag in the traditional soft package battery cell packaging process is overcome, poor sealing is resulted, and then the phenomenonof flatulence of the battery cell in the use process or poor appearance of the battery cell is resulted; and by the adoption of the design method of the polymer soft package battery cell air bag, thepackaging cost of the polymer soft package battery cell can be effectively reduced while battery cell sealing is not affected and gas expansion or poor battery cell appearance in the using process ofthe battery cell is avoided.

Description

technical field [0001] The invention belongs to the field of soft-pack batteries, and relates to a design method of a polymer soft-pack electric core air bag. Background technique [0002] When the polymer soft pack lithium battery is formed, the side reaction between the electrolyte and the pole piece will produce gas during the formation process. In order to ensure the normal production of batteries, a part of the aluminum-plastic film is reserved as an air bag when the battery is packaged to store the gas generated by chemical formation. This part of the aluminum-plastic film is called the battery air bag. When the cell is in the exhaust process, the equipment will puncture the air bag, pump out the converted gas, then seal the cell twice, and finally cut off the air bag. [0003] The traditional air bag design relies on the experience of engineers, and the width of the air bag is estimated according to the design capacity of the battery cell, which cannot be designed qu...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M10/052
CPCH01M10/0587H01M10/052Y02E60/10Y02P70/50
Inventor 李万亮孙梦婷易万超刘碧辉朱坤庆计阳陶德瑜夏小勇
Owner 东莞维科电池有限公司