Multiphysical field measurement and fusion for battery electric-thermal-contour performance analysis

Abstract

A battery often exhibits a coupling change in electric, thermal and battery surface topography during operation, especially under abuse conditions. Analysis of the coupling relationship among the multiphysical field parameters is necessary for battery physical structure optimization, failure mechanism analysis and fault prognostics method design. However, there are few multiphysical data acquisition and analysis systems for batteries at present. In this context, a novel battery multiphysical field measurement system with a data fusion model for battery performance analysis is proposed in this paper. The measurement system consists of a three-dimensional scanner, an infrared thermal imager, and an integrated battery charger and discharger. In order to accurately acquire the relationship between the battery surface topography and the battery surface temperature, a data fusion model is proposed, and a joint calibration method is accordingly introduced for the parameter identification of the data fusion model. The results show that the multiphysical measurement system can achieve the position matching deviation of 0.19 mm with high resolution and high data acquisition speed. The functionality of the multiphysical measurement system and the data fusion model are verified by the experimental results of different tests, including a 1 C rate charging/discharging test, a high rate charging/discharging test, and two battery abuse operation tests. It will provide key tools for battery thermal runaway mechanism analysis and battery fault diagnosis method design.