A Study on Multi-Fault Diagnosis Methods for a Series-Parallel Battery Pack

Abstract

The fault diagnosis function of the battery management system (BMS) is crucial for battery pack safety and reliable operation. This paper proposes a new series-parallel connected battery pack voltage measurement design scheme, which can save voltage sensors number from n to 0.75n for n cells in series. The multi-fault diagnosis strategy is proposed by analyzing the law of battery pack current and voltage signals. Three kinds of fault, including connection fault, sensor fault, and micro external short circuits (mESC) fault, were simulated to verify the effectiveness of the diagnosis strategy. This paper provides an important reference for the research on fault diagnosis of series-parallel battery packs by applying measurement information in practice.