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Air bag support for improving the formation performance of flexible packaging lithium-ion batteries and its application method

A lithium-ion battery and flexible packaging technology, which is applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, climate sustainability, etc., can solve the problems of fusion of air bag pits, reduction of effective gas storage volume of air bag, etc., to save production Cost, improve battery efficiency, and simple structure

Active Publication Date: 2015-09-09
HUNAN GAOYUAN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the vacuum pre-sealing is performed after the electrolyte is injected, part of the PP in the inner layer of the aluminum-plastic film of the air bag will fuse together due to the heat diffusion of the head, resulting in a decrease in the effective gas storage volume of the air bag.
The general practice in the industry is to punch holes on the air bags to increase the air storage space, but in the actual production process, due to the vacuuming to make the inner sides of the air bags contact each other, some air bag holes will still be fused together

Method used

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  • Air bag support for improving the formation performance of flexible packaging lithium-ion batteries and its application method
  • Air bag support for improving the formation performance of flexible packaging lithium-ion batteries and its application method
  • Air bag support for improving the formation performance of flexible packaging lithium-ion batteries and its application method

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Embodiment 1

[0027] See figure 1 The battery of this embodiment is a polymer cell type 354364 (cell thickness 3.5mm, width 43mm, length 64mm), and the air bag 7 has a length of 64±0.5mm and a width of 45.0±2.0mm. When the bracket body 1 is not used, the effective width of the air bag 7 is reduced by 10.0mm due to the thermal diffusion of the head during the vacuum pre-sealing after liquid injection, and the effective gas storage space is significantly reduced. The battery body 6 has serious flatulence after pre-charging , The ratio of the air bag 7 rupture due to the reduced volume of the air bag 7 during shaping is 0.10%. The bracket body 1 used in the present invention has a base material of PP, and the size of the bracket is 40.0±1.0 mm in length, 5.0±1.0 mm in width, and 1.2±0.1 mm in thickness. After the bracket body 1 is used, the heat radiation of the head is reduced to 2mm during pre-sealing, and the air bag 7 rupture ratio is 0 during shaping.

Embodiment 2

[0029] The battery of this embodiment is a polymer cell 1072170 type (cell thickness 10mm, width 72mm, and length 170mm), and the air bag 7 has a length of 170±0.5mm and a width of 60.0±2.0mm. When the bracket body 1 is not used, the effective width of the air bag 7 is reduced by 15.0mm due to the thermal diffusion of the head during the vacuum pre-sealing after liquid injection, and the effective gas storage space is significantly reduced. The battery body 6 has serious flatulence after pre-charging , The ratio of the air bag 7 rupture due to the smaller volume of the air bag 7 during shaping is 0.17%. The bracket body 1 used in the present invention has a base material of PE, and the size of the bracket is 140.0±1.0 mm in length, 4.0±0.5 mm in width, and 9.8±0.1 mm in thickness. After the bracket body 1 is used, the heat radiation of the head is reduced to 1.0 mm during pre-sealing, and the air bag 7 rupture ratio is 0 during shaping.

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Abstract

The invention discloses an air bag support for improving the formation performance of a flexible-packaging lithium-ion battery and an application method of the air bag support. A support body (1) is composed of a support frame (2) and division bars (3) which are arranged in the support frame (2) in a staggered way, and the division bars (3) which are arranged in the staggered way divide the support body (1) into a plurality of small channels (4). The air bag support has the functions that the support body (1) is pasted to one side of a flexible-packaging lithium-ion battery air bag through an adhesive tape to support two outer-packaging aluminum plastic films so as to effectively avoid the phenomenon that the inner layers of the aluminum plastic films are fused together due to thermal diffusion when the edge of the air bag is packaged after a solution is injected into a battery core, therefore the effective air storage space of the air bag is increased, the possibility that the battery core cracks due to more gases during shaping after pre-filling is reduced, the interface properties of the positive pole and the negative pole of the battery during the pre-filling of the battery core are improved, and the support is of great help to promoting the electrochemical performance of the battery. The air bag support has the advantages of novel design, simple structure and stable and reliable working performance.

Description

Technical field [0001] The present invention relates to an air bag support, in particular to an air bag support for lithium ion batteries using aluminum plastic film as a packaging material. The invention also relates to a method for using the air bag support for improving the formation performance of soft-packaged lithium ion batteries. Background technique [0002] At present, in the production process of lithium-ion batteries, especially soft-packaged ion batteries using aluminum-plastic film, a large amount of gas will be generated due to the oxidation and reduction of the electrolyte during the battery pre-charging process. If these gases are between the positive and negative plates Existing in the form of bubbles will seriously affect the electrochemical performance and safety performance of the battery. Therefore, in the production process of the soft-packaged lithium-ion battery, an air bag is reserved to store the gas generated during the pre-charge process. However, whe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCY02E60/10Y02P70/50
Inventor 唐杰雄李阳春
Owner HUNAN GAOYUAN BATTERY
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