Power battery protection system and electric vehicle

Abstract

The invention discloses a power battery protection system comprising: a battery management system BMS; A high-voltage circuit relay for controlling the on-off of the high-voltage circuit; The relay control circuit controls the on-off of the high-voltage circuit relay according to the control signals of the master control module and the slave control module. When the state of the single battery isabnormal, the slave control module sends a disconnect signal to the relay control circuit, and the relay control circuit disconnects the high-voltage circuit relay after receiving the disconnect signal from the control module. The invention increases the output of overvoltage and over-temperature alarm signals of the slave control module, as at least one of that slave module triggers the protection threshold. The slave control module directly disconnects the high-voltage contactor in the high-voltage circuit of the power battery. The invention makes the master control module and the slave control module of the BMS system have the safety protection function, thereby better protecting the overcharge and over-temperature problems of the power battery, and increasing the reliability of the system safety protection.

Description

technical field [0001] The invention relates to the field of power batteries for electric vehicles, in particular to a protection system for lithium-ion power batteries of pure electric vehicles or other power batteries with high overall requirements and an electric vehicle using the power battery protection system. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density and long cycle life, but lithium-ion batteries need protection and control such as overcharge and overtemperature. At present, the protection of the power battery is carried out by a battery management system (Battery Management System, battery management system). The BMS system includes a master control module and a slave control module. Among them, the main control module is mainly used for the protection and control of overcharge and over temperature, and is responsible for the closure and disconnection of the high-voltage circuit; the slave control module is r...

AI Technical Summary

Problems solved by technology

[0008] It can be seen from the above-mentioned existing BMS system solutions that if the main control module controls the disconnection of the high-voltage circuit, if the main control module itself fails or the CAN communication network is abnormal, if the high-voltage circuit cannot be disconnected in time circuit, will greatly increase the risk of safety issues such as overcharging or overheating of the power battery

Since the safety of the power battery is the first control index, once a safety problem occurs, it will have serious consequences such as fire

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