Detection method of flexibility of battery pole piece

Abstract

The invention relates to the field of lithium ion batteries, in particular to a detection method of flexibility of a battery pole piece. After squeezing of the cylindrical pole piece is stopped, the distance between upper and lower squeezed surfaces of the cylindrical pole piece is measured, and the measured distance is analyzed, so that the flexibility of the pole piece is judged. On the basis ofnot damaging the structure of the pole piece, the flexibility of the pole piece can be quantized quickly and accurately, the error is small, repeatability is good, and a reliable basis for design anda manufacturing process of a battery is provided.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for detecting flexibility of battery pole pieces. Background technique [0002] The development of modern society provides a broad space for the application and development of rechargeable secondary batteries, and at the same time puts forward higher requirements for secondary batteries, hoping that they can have higher capacity, good safety and longer cycle Lifespan etc. However, high capacity requires higher coating weight and compaction density of the pole piece, which makes the flexibility of the battery pole piece worse. During the winding process of the square pole piece, the extrusion shear stress on both sides of the winding core and the pulling shear stress on the outside are the largest, causing the diaphragm to break easily on both sides of the winding; , the degree of wrinkling of the pole piece wound on the inner ring also has a great relationship with...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for detecting the flexibility of battery pole pieces, which is used to solve the problems of high cost and error-prone problems in the prior art when testing the flexibility of battery pole pieces.

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