The charging safety of electric vehicles has always been a topic of concern to new energy OEMs. The spontaneous combustion of electric vehicles due to charging will not happen. Once it occurs, the negative impact on manufacturers' vehicles may be fatal. Therefore, how to prevent the safety of electric vehicles during the charging process is very important. The core key point is the BMS system. During the charging process and the battery use process, how to effectively monitor and control the various states of the battery Feedback is very important for the safety of electric vehicles.