Studying the failure modes of power battery systems is of vital importance to improving battery life, the safety and reliability of electric vehicles, and reducing the cost of electric vehicles. Various failure modes are considered in the design of the power battery system to improve the safety of the power battery.

　　Researchers and battery manufacturers need to improve the safety of lithium battery cells through continuous improvement of processes and technologies. BMS system manufacturers must fully understand the performance of the battery and design a safe and reliable battery system based on the safety design principles of power batteries. Use is the ultimate barrier to ensure battery safety.

　　Studying the failure modes of power battery systems is of vital importance to improving battery life, the safety and reliability of electric vehicles, and reducing the cost of electric vehicles. Various failure modes are considered in the design of the power battery system to improve the safety of the power battery.

　　The power battery system is usually composed of batteries, battery management systems, Pack systems including functional components, wiring harnesses, structural parts and other related components. Power battery system failure modes can be divided into three different levels of failure modes, namely, battery cell failure mode, battery management system failure mode, and Pack system integration failure mode.