The invention relates to the technical field of new energy electric vehicle power batteries, and discloses a battery system high-voltage relay adhesion fault detection circuit and method. Detection current is output through a DC/DC power module U1, and the output level state of a phototriode in an optocoupler U2 is determined according to the on-off state of a high-voltage relay KM1; the on-off state of the high-voltage relay KM1 is fed back to a controller (BMS or VCU or MCU) in real time, the controller can judge whether the high-voltage relay KM1 has an adhesion fault or not through comparison, and the detection circuit has the advantages that the detection circuit can independently work at the high-voltage part of the battery system, is electrically isolated from the controller (BMS or VCU or MCU) part and is not interfered; the high-voltage relay adhesion detection circuit can detect adhesion conditions of contacts of corresponding high-voltage relays in a one-to-one mode, has the advantages of being high in anti-interference capacity, simple in circuit structure, low in cost and high in reliability, can be applied to adhesion fault detection of multi-path output relays in a multi-path copying mode, and has large practical value.
本发明涉及新能源电动汽车动力电池技术领域,公开了一种电池系统高压继电器粘连故障检测电路及方法,通过DC/DC电源模块U1输出检测电流,依据高压继电器KM1的通断状态决定光耦U2中光敏三极管的输出电平状态,将高压继电器KM1的通断状态实时反馈给控制器(BMS或VCU或MCU),控制器通过比较即可判断高压继电器KM1是否发生粘连故障,本发明的优点在于检测电路可独立工作在电池系统高压部分,与控制器(BMS或VCU或MCU)部分电气隔离,不受干扰;且能够一对一的检测相应高压继电器的触点粘连情况,抗干扰能力强,具有电路结构简单,成本低廉、可靠性高的优点,同时可以多路复制应用到多路输出继电器的粘连故障检测上,具有较大的实用价值。
Battery system high-voltage relay adhesion fault detection circuit and method
一种电池系统高压继电器粘连故障检测电路及方法
2021-07-23
Patent
Elektronische Ressource
Chinesisch
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