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A kind of film and film sticking method for improving the surface wrinkle of soft pack lithium-ion battery

A technology of soft-packed lithium batteries and soft-packed batteries, which is applied in secondary batteries, electrolyte battery manufacturing, non-aqueous electrolyte batteries, etc., can solve the problems of battery wrinkles, structural deformation, high defective ratio, etc., to reduce accuracy and difficulty, reduce Effect of small contact area and reduced use area

Active Publication Date: 2021-12-10
余姚市海泰贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the process of using the commonly used PET film in the industry, there is a slight "wrinkle" or serious "hook" on the surface of the battery that causes structural deformation of the pouch battery during the final inspection, resulting in a large number of defective products and scrapped products.
Especially in the production of pouch batteries with large area and size, the defective ratio is even higher

Method used

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  • A kind of film and film sticking method for improving the surface wrinkle of soft pack lithium-ion battery
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  • A kind of film and film sticking method for improving the surface wrinkle of soft pack lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Take the 11216266-60Ah soft pack structure lithium battery as an example, such as figure 2 As shown, the customized width of the PET film is 206≤W1≤211mm, and the length of the automatic cutting is 246≤H1≤261mm. The PET film has been perforated with a pore diameter of 0.1mm, which meets the 140-mesh hole number standard, such as image 3 As shown, the pouch battery width W2 = 216mm, height H2 = 266mm, such as figure 1 As shown, the battery is processed through batching, coating, preparation of bare cells, encapsulation once, and then film application. The front and back sides of the centered cell are respectively filmed, leaving the 12 positions of the airbag belt completely. Put the film-attached cells into an oven for vacuum-90Kpa, 85°C process standard baking for 24 hours, then liquid injection, chemical formation, high-temperature storage at 45°C, storage time for 12 hours and other standardized treatments. After re-degassing, secondary molding, encapsulation, and...

Embodiment 2

[0025] Refer to Example 1 for the specific process. The difference from Example 1 is that the PET film is perforated, with a pore diameter of 0.3 mm, which meets the 50-mesh hole number standard. Record the batch appearance wrinkle failure rate, which is recorded as Example 2.

Embodiment 3

[0027] Refer to Example 1 for the specific process. The difference from Example 1 is that the PET film has been perforated with a pore diameter of 0.5 mm, which meets the 35-mesh hole number standard. Record the batch appearance wrinkle defect rate, and record it as Example 3.

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Abstract

The invention discloses a film sticking method and a film sticking method for improving surface wrinkles of a soft-packed lithium battery. The film sticking film is a PET film with a plurality of small holes, and the PET film has a pore diameter of 0.1-0.5 mm and a hole number of 35-140 mesh. , the thickness of the PET film is 0.3-0.6mm; the film sticking method is that after the first packaging process of the soft pack battery is completed, the perforated PET film is centered and pasted on the front of the soft pack battery after the primary packaging is completed. On the opposite sides of the main body, leave a place for the airbag belt. In the present invention, the ordinary PET film is punched to reduce the contact area between the PET film and the aluminum-plastic film of the main body, which is beneficial to improve the heat shrinkage of the PET film and the heat loss of the aluminum-plastic film during the high-temperature baking after the film sticking process. The problem of inconsistent shrinkage, the thermal stress caused by the baking process after release causes the deformation of the aluminum-plastic film, thereby solving the problem of aluminum-plastic film wrinkles.

Description

technical field [0001] The invention relates to the technical field of film sticking for soft-pack lithium-ion batteries, in particular to a film sticking method for improving surface wrinkles of soft-pack lithium-ion batteries and a film sticking method. Background technique [0002] Soft-pack batteries are one of the mainstream systems alongside battery structures such as cylinders, aluminum cases, and plastic cases, and are in great demand. Widely used in digital 3C products, and power and energy storage markets. The soft pack lithium battery is composed of positive and negative electrode materials, a separator, an electrolyte, and an aluminum-plastic film (nylon-aluminum layer-polypropylene) coated on the outermost layer. The use of aluminum-plastic film packaging for soft pack batteries has many advantages such as light weight, high battery energy density, changeable shape, easy size adjustment, and excellent cycle. However, the nylon layer on the outermost layer of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 黄志勇余开明娄忠良陈建鹏崔俊葳徐伟
Owner 余姚市海泰贸易有限公司