Lithium Battery Expansion Behavior Evaluation Technology and Coping Methods

As a key energy storage component, the rapid detection of battery status and safety and reliability evaluation of the lithium battery have attracted more attention. Among them, the expansion behavior evaluation technology of the lithium battery, as a non-destructive rapid detection method, is an effective means to evaluate the health status of the battery and realize early safety warning. This paper reviews the causes of the current expansion phenomenon of lithium battery, the development status of expansion evaluation technology and the evaluation method of expansion test results. The existing expansion behavior evaluation technology under constant pressure and constant displacement conditions are classified and discussed. By accurately obtaining changes in the internal state of the battery, it can accurately predict and evaluate performance, life and safety. By obtaining the critical conditions of battery expansion, the design and optimization of the module structure are guided. On this basis, the limitations of lithium battery expansion test under different boundary conditions are further discussed. The future development of battery expansion test methods and battery expansion control and solutions are proposed. This paper aims to optimize the evaluation technology of lithium battery expansion behavior and improve the safety and reliability of the battery.