High-isolation voltage-resistant battery management system for rail transit

Abstract

The invention belongs to the technical field of rail transit, and relates to a high-isolation voltage-resistant battery management system for rail transit. The system comprises a main board, a plurality of slave boards and a plurality of acquisition boards, the main board and the plurality of slave boards are in communication connection through a CAN bus, and each slave board and the plurality of acquisition boards are in communication connection through a daisy chain bus; each acquisition board is connected with one battery module; the main board obtains battery parameter data of the slave boards through the CAN bus; each slave board obtains battery parameter data of the acquisition boards through the daisy chain bus; each acquisition board is responsible for acquiring voltage and temperature parameters of a battery of the corresponding battery module and transmitting the voltage and temperature parameters to the slave boards through the daisy chain bus. According to the battery management system with the three-level architecture, the circuit design of the slave boards and the acquisition boards can be simplified, and the hardware cost is remarkably reduced; an electrical isolation mode combining digital isolation and analog isolation is adopted between a high-voltage side and a low-voltage side, so that the isolation voltage endurance capability of the system is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and relates to a battery management system with high isolation and withstand voltage for rail transit. Background technique [0002] Lithium titanate batteries have the characteristics of high safety factor, good wide temperature performance and long cycle life, and have been widely used in rail transportation. Lithium titanate batteries need to be equipped with a battery management system for use. The battery management system monitors the voltage and temperature parameters of the lithium titanate battery in real time to achieve maintenance-free lithium titanate batteries during their life cycle. According to application requirements, lithium titanate batteries are generally divided into power supply and auxiliary power supply. At present, the rated voltage of power supply has reached 1500V~1800V, and the voltage level is expected to be higher in the future. The higher the rated voltage of...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects in the existing technology, the present invention aims to solve the problem that the master-slave secondary architecture of the existing rail transit battery management system cannot meet the isolation and withstand voltage requirements of higher voltage level equipment. The brief solution is: use the main board, slave The battery management system with the three-level structure of the board and the acquisition board can solve the above problems. The specific technical solutions are as follows:

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