Battery management system based on CAN communication, and battery charging and discharging method

Abstract

The invention discloses a battery management system based on CAN communication, and a battery charging and discharging method. The system comprises a plurality of battery boxes connected in parallel,wherein each battery box comprises a main control module, an acquisition module, a CAN communication module, a battery module, a positive electrode relay, a negative electrode relay and a diode, the acquisition module acquires the voltage signal of the battery module, the CAN communication module is used for communication between the main control modules between the battery boxes and communicationbetween the main control module in the battery boxes and the acquisition module, the main control module controls the on-off of the positive electrode relay and the negative electrode relay accordingto the acquired voltage signals, the positive electrode relay and the negative electrode relay are connected with the battery module in series and used for controlling on-off of the charging and discharging loop of the battery module, and the diode is in anti-parallel connection with two ends of the positive electrode relay. According to the invention, the problems of low bus utilization rate andlow data transmission rate in the existing battery management system are solved, and the situations that a single master-slave structure cannot identify errors and communication paralysis is caused when one node is damaged are avoided.

Description

technical field [0001] The invention relates to the field of power management, in particular to a CAN communication-based battery management system and a battery charging and discharging method. Background technique [0002] The battery management system (Battery Management System, BMS) is the "brain" of the power battery. It is used to manage, maintain, and monitor each module of the battery. important task. As an important link connecting the battery pack, vehicle system and motor, the importance of the battery management system is self-evident. The battery management system is the core technology of the power battery pack. [0003] The electric locomotive used for mine ground transportation is used for long-distance roadway transportation, and mainly completes the transportation of coal, gangue, material equipment and personnel. With the upgrading of the power supply of mining electric locomotives, the traditional lead-acid batteries have been upgraded to power lithium-...

AI Technical Summary

Problems solved by technology

With the upgrading of the power supply of mining electric locomotives, the traditional lead-acid batteries have been upgraded to power lithium-ion batteries. However, the existing battery management system of mining electric locomotives still has the following problems and defects: the communication control of the battery management system is Single master-slave structure, there is only one host, and the communication is initiated by the host. Only when the host gives a command, the subordinate node can send data, and after the transmission is completed, the host can only send an inquiry to the next node after receiving the reply, and the error cannot be identified. , Therefore, when a subordinate node is damaged, the host cannot continue to communicate, which will cause communication paralysis, resulting in low bus utilization and data transmission rate

Images