A cell manufacturing process based on dry film formation

A dry film and cell technology, applied in sustainable manufacturing/processing, circuits, electrical components, etc., can solve problems such as affecting safety, burrs on the edge of electrodes, etc., to improve the efficiency and safety performance of finished products, equipment structure and The effect of cost reduction and simple process

Active Publication Date: 2022-02-25
郜明文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has not solved the problem of burrs on the edge of the electrode caused by die-cutting in the process of preparing positive and negative electrodes, which affects safety.

Method used

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  • A cell manufacturing process based on dry film formation
  • A cell manufacturing process based on dry film formation
  • A cell manufacturing process based on dry film formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Firstly, the lithium iron phosphate, SUPER P and PTFE were fully mixed according to the mass ratio of 95:3:2 by dry method, and then rolled into a film to obtain a self-supporting positive electrode dry film. The mesophase carbon microspheres, SUPER P and PTFE According to the mass ratio of 95:3:2, they were fully mixed and rolled into a film to obtain a self-supporting negative electrode dry film, which was rolled to 100 μm respectively. The obtained self-supporting positive and negative electrode dry-process membranes were trimmed to a width of 40 cm, and then the self-supporting positive and negative electrode dry-process membranes were wound up separately.

[0046] The positive and negative current collectors used are aluminum foil and copper foil respectively. The thickness of the current collector is 10 μm respectively, and the width of the positive and negative electrode current collectors is greater than the width of the self-supporting dry film, so as to leave ...

Embodiment 2

[0051] Firstly, the ternary materials NCM, Ketjen black, and PVDF were fully mixed according to the mass ratio of 97:2:1 by dry method, and then rolled into a film to obtain a self-supporting positive dry film. Artificial graphite, Ketjen black, and PVDF were prepared according to The mass ratio of 97:2:1 was fully mixed and rolled into a film to obtain a self-supporting negative electrode dry film, which was rolled to 120 μm respectively. The obtained self-supporting positive and negative electrode dry-process films were trimmed to a width of 50 cm, and then the self-supporting positive and negative electrode dry-process films were wound up separately.

[0052] The positive and negative current collectors used are aluminum foil and copper foil respectively. The thickness of the current collector is 15 μm, and the width of the positive and negative current collectors is greater than the width of the positive and negative electrodes, so as to leave the tab part, such as figure...

Embodiment 3

[0057] Firstly, lithium cobalt oxide, KS6, and SBR were fully mixed according to the mass ratio of 90:7:3 by dry method, and then rolled into a film to obtain a self-supporting positive electrode dry film. Hard carbon, KS6, and SBR were mixed according to 90:7:3 The mass ratio is fully mixed and then rolled into a film to obtain a self-supporting negative electrode dry film, and rolled to 80 μm respectively. The obtained self-supporting positive and negative electrode dry-process membranes were trimmed to a width of 60 cm, and then the self-supporting positive and negative electrode dry-process membranes were wound up separately.

[0058] The positive and negative current collectors used are aluminum foil and copper foil respectively. The thickness of the current collector is 20 μm respectively, and the width of the positive and negative current collectors is greater than the width of the positive and negative electrodes, so as to leave the tab part, such as figure 1 shown. ...

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Abstract

The invention provides a battery cell preparation process based on dry film formation. In the process, firstly, the self-supporting positive and negative electrode dry film obtained by the dry process is combined with the positive and negative electrode collectors to obtain the positive and negative electrode sheets; Then scrape off part of the dry-process film to leave a blank area; finally, combine the positive and negative plates with the separator and perform Z-folding as a whole to obtain the finished battery cell. At the same time, the invention also discloses a battery comprising the above electric core. Based on the cell preparation process provided by the present invention, it is different from traditional winding cells and laminated cells, and can effectively avoid the generation of burrs and kinks on the die-cutting edges during production, and improve the production of cells. Efficiency and safety performance, simple process leads to equipment structure and cost reduction. The battery cell prepared based on the invention can increase the electrochemical stability and safety of the cycle process.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a battery cell preparation process based on dry film formation. Background technique [0002] Due to the advantages of high energy density, long cycle life, and good cycle stability, lithium-ion batteries are widely used in industrial production and social life such as electric vehicles, digital products, and energy storage. However, in recent years, the safety of lithium-ion batteries, especially the safety of power batteries used in new energy vehicles, has aroused widespread social concern. Therefore, the control of each link of the lithium-ion battery manufacturing process is more stringent and precise. On the one hand, the process steps are increased, and on the other hand, the production cost is also increased. Improving battery safety, cycleability, and energy density, reducing production costs, and further expanding the use scenarios of lithium-ion batter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0585H01M10/0525
CPCH01M10/0585H01M10/0525Y02E60/10Y02P70/50
Inventor 郜明文
Owner 郜明文
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