Battery management system loop interlock and slave address setting method

Abstract

The invention, within the technical field of application of a battery management system of an electric automobile, in particular relates to a battery management system loop interlock and slave addresssetting method. The setting method comprises an upper computer, a main control unit and a slave unit. The main control unit and the slave unit are provided with at least one path of PWM signal inputcircuit and one path of PWM signal output circuit. And the main control unit PWM signal input / output interface is sequentially connected with the slave unit PWM signal input and output interface to form a battery management system interlocking loop. According to the battery management system loop interlocking requirement, a battery management system loop interlocking interface and a CAN communication network are fully utilized to realize the slave address setting of the battery management system. On the one hand, the method improves the security of the battery management system; on the other hand, through the CAN interface, all the slave address settings in the battery management system are completed at one time, and the slave address is not required to be unpacked one by one with the advantage of high efficiency and low error rate for address setting method.

Description

technical field [0001] The invention relates to the field of application technology of electric vehicle battery management systems, in particular to a battery management system loop interlock and slave control address setting method. Background technique [0002] With the development of electric vehicles, the battery management system (Battery Management System, BMS) has also been widely used, and the safety of the battery management system is directly related to the safety of vehicles and personal safety. At present, the main control unit and each slave control unit in the battery management system completely rely on CAN communication for information exchange and fault alarm. The method is single and there is no safety redundancy design. Once the CAN communication fails, the entire system will be paralyzed. In addition, the current slave control unit of the battery management system generally distinguishes the address of the slave control unit through individual calibration...

AI Technical Summary

Problems solved by technology

At present, the main control unit and each slave control unit in the battery management system completely rely on CAN communication for information exchange and fault alarm. The method is single and there is no safety redundancy design. Once the CAN communication fails, the entire system will be paralyzed

In addition, the current slave control unit of the battery management system generally distinguishes the address of the slave control unit through individual calibration, wiring harness design differentiation, or hardware design differentiation. Single calibration requires professional calibration personnel and tools, and the calibration efficiency is low. When the number of slave control units is large, it is very easy to have missing and wrong labels

The differentiated method of wire harness design increases the complexity of wire harness processing. Every time the slave control unit is powered on, it needs to read the address to set the state of the wire harness, which is easily interfered by external factors and increases the probability of error in the slave control address.

However, the differentiation of hardware design has disadvantages such as difficulty in controlling the production process of the slave control unit, and complicated maintenance and replacement in the later period.

From the perspective of safety redundancy design, production, and convenience of use, the current battery management system has obvious deficiencies

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