Indirect test method for explosion-proof pressure of metal battery shell

Abstract

The invention discloses an indirect test method for explosion-proof pressure of a metal battery shell, and aims to provide an indirect test method for explosion-proof pressure for realizing the measurement of the explosion-proof pressure by quantitatively detecting the residue thickness of an explosion-proof valve with high test speed, high accuracy and no damage to the metal shell. The method comprises the following steps: carrying out regression analysis for the explosion-proof pressure of the metal battery shell and the residue thickness of the explosion-proof valve to obtain a fitted equation of the residue thickness of the explosion-proof valve and the explosion-proof pressure of the battery shell; measuring the residue thickness of the explosion-proof valve of the metal battery shell to be tested; and inserting the residue thickness of the explosion-proof valve of the metal battery shell to be tested into the fitted equation of the residue thickness of the explosion-proof valve and the explosion-proof pressure of the metal battery shell to obtain the explosion-proof pressure of the metal battery shell to be tested. The method of the invention belongs to indirect and non-destructive test, and has no damage to the metal shell. And the method has the advantages of high measurement speed for the residue thickness, high accuracy, good test repeatability for the explosion-proof pressure, neat test environment and convenient measurement.

Description

technical field [0001] The invention relates to the technical field of explosion-proof pressure detection of metal battery shells, and more specifically relates to an indirect test method for the explosion-proof pressure of metal shells of lithium-ion batteries. Background technique [0002] In the battery industry, especially in the lithium-ion battery industry, an explosion-proof device of a specific shape (here called an explosion-proof valve) is usually designed on the surface of the metal aluminum shell to ensure that the explosion-proof valve will automatically open when the internal pressure of the battery reaches a certain level. Play the role of safety pressure relief. The design of the explosion-proof valve adopts various shapes of notches. The size of the explosion-proof pressure of the explosion-proof valve is the key to the safety design of the battery case. The test of the explosion-proof pressure has become a key item in the detection of the battery case. [...

AI Technical Summary

Problems solved by technology

[0009] 1. The test method is firstly a destructive test method, and the tested battery case can no longer be used

[0010] 2. There are many types of external dimensions of the battery case, and the mouth size is different. The rubber gasket used for sealing cannot be used universally and needs to be customized.

[0011] 3. The area of ​​the rubber pad is large, the sealing effect is not ideal, and it is easy to leak water, which affects the validity of the test value

[0012] 4. Since the position of the explosion-proof valve is mostly designed at the mouth of the battery case that is prone to deformation, the thick rubber pad will affect the deformation of the shell at this part, thereby affecting the deformation and tearing of the explosion-proof valve, resulting in high explosion-proof pressure test values

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