The establishment of safety indicator set of lithium-ion battery and its management system

The development of electric vehicles is potential with the scarcity of oil resources and the increasingly higher environmental requirements. The complex usage of electric vehicles requires high-capacity, high-current discharge and other requirements for power system. Electric vehicle power system security incidents occur occasionally, security analysis and evaluation of battery management systems is becoming increasingly important, but rarely studied. The current safety studies about battery have been limited in anode and cathode materials, separator materials for high temperature resistance and other properties of the cycle. The current assessment methods about battery management system are doing charge and discharge test, if the test data belong to the required range, it is passed, otherwise is not passed. This is an extensive evaluation. There is no method and indicator set to analyze and evaluate the safety of battery and its management system. A method based on probabilistic risk analysis is presented in this paper, it can do both qualitative and quantitative analysis about safety infected by battery design and battery management system's functional components. In this paper, the safety impact of battery and its management system's functions to the electric vehicle is studied, and 14 indicators are chosen according to the probability importance sensitive as the evaluation indicator set to evaluate the safety of the electric vehicle, and a brief analysis of these indicators and calculation methods, in order to verify its feasibility. Analysis shows that the biggest factor of the electric vehicle safety is the achievement of the BMS's function, followed by the environment, the battery itself and the maintenance timely.