关键词: 氢燃料电池；绝缘检测；绝缘防护；冷却液电导率

Abstract: The insulation value of hydrogen fuel cell is affected by the coolant conductivity, and the insulation value will continue to decrease during operation until the insulation failure occurs. In order to reduce the frequency of insulation failure, this paper discusses and analyzes the principle of influence of coolant conductivity on fuel cell insulation based on insulation requirements and detection principle. The relationship between coolant conductivity and accumulated mileage and vehicle insulation value are quantitatively tested by means of static test and vehicle durability data acquisition, and then a insulation protection scheme is proposed, which is verified by real vehicle operation on the fuel cell demonstration vehicle. The results show that the insulation protection scheme can effectively avoid the occurrence of insulation faults in vehicle operation.

Key words: Hydrogen fuel cell; Insulation detection; Insulation protection; Coolant conductivity