Functional safety evaluation of battery anagement system based on probability of failure per hour

Abstract

In order to identify functional safety property of battery management system, safety integrity level of BMS research is performed by average frequency of a dangerous failure of the safety function. The result shows that: currently, functional safety has been research at home and abroad, through evaluation system of road vehicle and electrical, electronic, programmable electronic safety-related systems. So, safety integrity level could be analyzed quantitatively by a functional relation, which is established among tolerable hazard frequency, demand rate on safety-related protection system, dangerous failure of average frequency and safety integrity level. Based on tolerable hazard frequency and the demand rate on safety-related protection system, safety integrity level of a BMS is evaluated as level II.