Reliability Analysis of the High-Voltage Power Battery System Based on the Polymorphic Fuzzy Fault Tree

Accidents caused by the failure of high-voltage power battery systems are rising with increase pure electric commercial vehicles. The fault tree analysis method based on traditional reliability is no longer suitable for quantitative evaluation polymorphic systems. In this paper, fuzzy system vehicles established and analyzed qualitatively quantitatively a combined theory theory, mathematical group decision theory. results showed that multistate reliability-analysis could describe various states system. Through system, low-temperature environment CAN high low reverse connection were weakest links problem occurrence probability each state unknown bottom event in sub-fault deteriorated-state mode was solved quickly using decision-making to deal probability. It provides theoretical reference design detection process, which has important practical significance improvement