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Method for testing maximum compacted density and peel strength of lithium cell pole piece

A technology of compaction density and peel strength, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve the problems of separation between experiment and production and actual production situation

Active Publication Date: 2010-06-16
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] At present, the method of testing the maximum compaction density is mostly to fold the pole piece in half to see whether the pole piece is broken or not. However, in the manufacturing process of lithium-ion batteries, the pole piece does not completely fold in half when winding the pole piece. Production is seriously out of touch; the method of testing peel strength is also out of touch with the actual situation in production

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  • Method for testing maximum compacted density and peel strength of lithium cell pole piece
  • Method for testing maximum compacted density and peel strength of lithium cell pole piece
  • Method for testing maximum compacted density and peel strength of lithium cell pole piece

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Embodiment Construction

[0019] During the production process of cylindrical lithium batteries, the winding of the pole piece may cause cracks or peeling off of the coating of the active material (even if the lithium battery has charging ability) on the pole piece, so the pole piece needs to be cleaned before being put into lithium battery production. Test to see if it is suitable for making lithium batteries.

[0020] The invention relates to a method for testing the maximum compaction density and peel strength of a lithium battery pole piece. During the test, the test pole piece is surrounded on a cylindrical column to simulate the possible bending state of the pole piece during the lithium battery production process.

[0021] The compaction density is a parameter of the pole piece, and the calculation formula is:

[0022] Compacted density = surface density / (electrode rolling thickness - current collector thickness)

[0023] It can reflect the amount of active material in the unit volume of the ...

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Abstract

The invention relates to a method for testing the maximum compacted density and the peel strength of a lithium cell pole piece. A testing pole piece surrounds a steel core having a preset diameter to simulate the probable bent state when the pole piece is wound in the production of the lithium cells. The test result is well combined with the production practice, so that the experiment is able to serve the production practice.

Description

【Technical field】 [0001] The invention belongs to the field of lithium battery manufacturing technology, in particular to a method for testing the maximum compaction density and peel strength of lithium battery pole pieces. 【Background technique】 [0002] The structure of lithium-ion batteries is mainly divided into two categories: laminated and wound. The stacked type stacks the positive electrode, the separator, the negative electrode, the separator, and the positive electrode in multiple layers. Weld all the positive electrodes together to lead out, and the negative electrodes are also welded together to lead out. The winding type is to place the positive electrode diaphragm, separator, and negative electrode diaphragm in sequence, and wind them into a cylindrical or square structure. [0003] At present, the method of testing the maximum compaction density is mostly to fold the pole piece in half to see whether the pole piece is broken or not. However, in the manufactu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00G01N19/04
Inventor 武磊磊杨闯刘杰宋华杰
Owner SHENZHEN BAK POWER BATTERY CO LTD
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