Hybrid communication system of electric vehicle battery management system

Abstract

The invention discloses a hybrid communication system of a vehicle battery management controller assembly. The hybrid communication system combines daisy chain communication, serial port communication and CAN communication, and the system comprises a main board 02, a branch board 03, a battery set 04 and a sampling wire harness 05; the main board 02 is connected with the branch board 03 through a CAN bus; the branch board 03 is connected with the battery set 04 through the battery set wire harness 05. The inside of the branch board uses the simple daisy chain communication and serial port communication, and the branch board communicates with the main board through the more mature CAN communication with stronger anti-interference ability; the hybrid communication system of the vehicle battery management controller assembly is capable of improving the anti-interference ability and reliability of the whole system and lowering the system cost.

Description

technical field [0001] The invention belongs to electric vehicle battery management technology, in particular to a hybrid communication technology of a battery management controller assembly CAN bus, daisy chain and serial port communication. Background technique [0002] The global auto industry is facing huge challenges such as financial crisis, energy crisis and environmental protection. To develop electric vehicles, realize the electrification of vehicle energy and power systems, and promote the strategic transformation of the traditional auto industry has formed a broad international consensus. At present, my country has issued many policies to support and guide the rapid development of the electric car industry, so as to accelerate the improvement of the competitiveness of the domestic electric car industry and shorten its maturity period. [0003] The power battery pack is a key component of an electric vehicle. According to different vehicle requirements, the number ...

AI Technical Summary

Problems solved by technology

Because as many as two-digit single acquisition chips may be used in a management system, each single sampling chip needs to use a slave microcontroller and a set of isolation circuits, resulting in a high cost of battery management controller assembly

And more isolation circuits in the circuit make the EMC problem of BMS more difficult to control;

[0006] The daisy chain circuit is a new type of ASIC-based single sampling circuit. The daisy chain communication is a simplified cascading mode, which adopts a serial communication mode. This communication mode can transmit control commands from the main controller, and can also communicate with adjacent chips. Data transmission, and the daisy chain communication has automatic identification technology for multi-level battery management chips. It does not need to compile hardware for sub-boards. The number of sub-boards can be increased, decreased and interchanged at will. The main advantage is to provide centralized management expansion Port, the circuit is simple, does not require additional peripheral circuits, and the cost is low; but the anti-interference ability of the daisy chain communication method is poor; because the high and low voltage communication does not use the same reference ground, it is vulnerable to the influence of reference ground voltage fluctuations and other shortcomings

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