Manufacturing method of high-energy-density button lithium ion battery

A lithium-ion battery and high energy density technology, which is applied in secondary battery manufacturing, electrolyte storage battery manufacturing, battery electrodes, etc., can solve the problems of not being able to make full use of the button shell space and low energy density, and achieve short-circuit prevention and high energy density Effect

Inactive Publication Date: 2014-12-31
SINOWATT DONGGUAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current button lithium-ion battery uses a winding method to make the pole piece and the diaphragm into an electrode group. Since the

Method used

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  • Manufacturing method of high-energy-density button lithium ion battery
  • Manufacturing method of high-energy-density button lithium ion battery
  • Manufacturing method of high-energy-density button lithium ion battery

Examples

Experimental program
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Effect test

Embodiment approach 1

[0022] Step 1: Filming. Use a die to punch the positive and negative electrodes into small pieces, and the punched negative electrodes are as follows: figure 1 As shown, the negative electrode sheet is composed of two parts: the dressing part 12, the tab part 11; the punched positive electrode sheet is as figure 2 As shown, the positive electrode sheet is composed of two parts: the dressing part 22 and the tab part 21 .

[0023] Step 2: Hot melt. The positive electrode sheet 42 is placed between the two layers of separators 41, the dressing part of the positive electrode sheet 42 is completely covered by the separator 41, and the ear part of the positive electrode sheet 42 (the part close to the dressing) is covered by the separator 41, most of which are on the outside of the diaphragm 41. Then use a hot-melt knife 31 that has the same shape as the dressing part of the positive electrode sheet and has a gap at the position of the corresponding positive electrode ear (the e...

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Abstract

The invention discloses a manufacturing method of a high-energy-density button lithium ion battery. The method comprises the following steps: stamping: stamping a positive electrode and a negative electrode into small pieces by using cutting dies; hot melting: making positive pieces and membranes into a positive piece-membrane complex; laminating: alternatively laminating the positive piece-membrane complex and negative pieces into a polar group, and rubberizing the polar group; welding: laminating an aluminum foil of the same shape as the positive pieces on one side of the polar group which is in contact with a positive cover, welding the lug of the aluminum foil and the lugs of the positive pieces together, welding the lugs of the negative pieces and a nickel belt together, putting the materials into a shell, and welding the nickel belt and a negative shell together; and performing baking, liquid injection, sealing, ageing and pre-charging to make a complete button lithium ion battery. Compared with an existing process, the method has the advantages that the space of the shell can be fully utilized, and the energy density is high; and through adoption of the positive piece-membrane complex made by hot melting, short circuit caused by contact of the positive and negative pieces is prevented, and the safety is high.

Description

technical field [0001] The invention relates to a method for manufacturing a button lithium ion battery. Background technique [0002] The current button lithium-ion battery uses a winding method to make the pole piece and the diaphragm into an electrode group. Since the winding core is square and the button shell is circular, the space of the button shell cannot be fully utilized, so the energy The density is not high. Contents of the invention [0003] The purpose of the invention is to provide a button lithium ion battery with high energy density, which can overcome the deficiencies in the prior art. [0004] The present invention is realized through special punching, hot melting, lamination and welding methods, see the following technical solutions: [0005] film. Use the designed positive electrode die and negative electrode die to punch the rolled positive electrode and negative electrode into small pieces. The small piece is divided into two parts: the dressing a...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M4/139H01M10/0436H01M10/058H01M50/531Y02E60/10Y02P70/50
Inventor 李树军郭密刘春元巫火桂张中俊朱玲
Owner SINOWATT DONGGUAN
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