Method for detecting internal corrosion of soft package lithium ion battery

Abstract

The invention discloses a method for detecting internal corrosion of a soft package lithium ion battery, and aims to solve the problems that the corrosion condition cannot be visually seen, the method is tedious, and the internal corrosion condition can be detected only by contacting dangerous articles such as acid, and the method comprises the following steps: S1, taking a formed to-be-detected lithium ion battery, and detecting the internal corrosion condition of the to-be-detected lithium ion battery; connecting the sealing area and the negative tab of the battery; s2, placing the lithium ion battery to be tested under a high-temperature condition; s3, observing whether a corrosion spot appears in the seal area or not, and if the corrosion spot appears, skipping to S4; if the corrosion spots do not appear, detecting the next lithium ion battery to be detected; and S4, observing the appearing corrosion spots, and judging the internal corrosion condition of the lithium ion battery to be detected. The method has the beneficial effects that the internal corrosion of the lithium ion battery can be conveniently detected, and a good technical basis is provided for finding the internal corrosion position and improving the quality of the battery; and the internal corrosion position and the corrosion degree can be visually observed.

Description

technical field [0001] The invention relates to the field of detection of soft-pack batteries, in particular to a detection method for internal corrosion of soft-pack lithium-ion batteries. Background technique [0002] Flexible packaging lithium-ion batteries usually use aluminum-plastic composite film as the outer packaging material for cell packaging. The basic composition of the aluminum-plastic composite film is the inner CPP heat-sealing adhesive layer, the middle aluminum layer and the outer nylon protective layer. When the flexible packaging lithium-ion battery is packaged in the cell, burrs or active material particles may remain around the cell. During the pumping process, these burrs or particles will pierce the inner heat-sealing film to the aluminum layer; or during the cell packaging process In this process, due to mechanical action or over-melting during heat sealing, the inner heat-sealing film of the aluminum-plastic composite film is damaged, and the alumi...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to solve the problem that the corrosion situation cannot be seen intuitively, and the method is cumbersome and requires contact with dangerous items such as acid to detect the internal corrosion situation. Corrosion can be seen, and the method is simple to detect internal corrosion without contact with dangerous substances such as acids

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