Method for analyzing internal pressure of square battery based on surface stress change

Abstract

The application discloses a method for analyzing internal pressure of a square battery based on surface stress change, which measures the internal pressure and the change of the surface stress with time of the battery in real time through a thin film array pressure sensor and a pressure sensor with a threaded joint. Based on the fitting analysis of the curve of the change of the internal pressure and the surface stress with time, a functional relationship between the internal pressure and the surface stress of the square battery is constructed. Then, when analyzing the internal pressure of other square batteries to be explained, the change of the internal pressure of the battery can be accurately predicted only by obtaining the surface stress of the square battery. Without destructive treatment of the battery shell, the internal pressure of the square battery can be obtained, the operation difficulty is greatly reduced compared with the traditional method of measuring the internal pressure through an opening, and the safety of the measuring process and the reliability of the data are effectively ensured.

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