Battery leakage detection method

Abstract

The invention provides a battery leakage detection method. The method includes following steps: step 1, injecting electrolyte and a tracer agent into a battery, and completing encapsulation of the battery; step 2, putting the battery obtained in the S1 into a closed container with a mass spectrometer, vacuumizing the container, holding pressure, filling gas, and repeating in this way; step 3, starting the mass spectrometer, detecting gas extracted from the closed container, and judging whether the battery leaks or not according to whether the tracer agent is present or not, wherein the traceragent is a substance containing at least one of elements 15N, 13C, 14C, 17O, 18O, 2H and 3H, does not corrode pole pieces, current collectors, pole lugs and an encapsulation material and does not react with the electrolyte or is not in negative reaction affecting performance of the electrolyte. By the method, defective batteries can be screened out conveniently and quickly to avoid potential safety hazards caused by the fact that the defective batteries having risk of electrolyte leakage go to clients.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery leak detection method. Background technique [0002] In the process of secondary battery manufacturing, the following conditions may cause battery leakage: 1) Insufficient battery circulation protection will cause defects such as battery surface damage and pinholes; 2) Battery packaging is incomplete due to equipment and personnel factors , there are leak seals, unpackaged, etc.; 3) The battery has leakage channels due to process problems. It should be noted that, on the one hand, electrolyte leakage will cause battery performance to decline; on the other hand, it will cause terminal corrosion, and defective channels will cause safety hazards, such as LiPF 6 The electrolyte absorbs water through defective channels, causing the battery to gas. [0003] In order to avoid the impact of electrolyte leakage on the electrochemical performance and safety perfor...

AI Technical Summary

Problems solved by technology

Patent CN201520158858 provides a positive and negative pressure leak detection method, suitable for leak detection of batch batteries, suitable for batteries with serious leakage, and low detection efficiency for batteries with subtle defects

In addition, helium detection methods have appeared in recent years, such as patents CN201320619362 and CN201710125397. This method has the characteristics of high detection rate, but this method has high requirements on equipment and environment, is expensive, and has low detection efficiency.