Battery management system and electric automobile

Abstract

The invention provides an electric automobile and a battery management system thereof. The system comprises a mainboard, a plurality of sub boards and a plurality of battery monomers, the mainboard acquires the message quantity and recurrence rate corresponding to each sub board sent by each sub board in the same network in a certain time period so as to calculate a bus load rate of a CAN bus in the time period; the mainboard also obtains the temperature information and voltage information of the battery monomer corresponding to each sub board in the time period, the mainboard / sub board calculates the score of the each board according to the score parameters obtained by using a sorting algorithm according to a variance of an average temperature and a variance of an average voltage of the sub board in a certain time period so as to obtain the priority of the sub board; and the mainboard judges whether the bus load rate is in an expected range or not, and dynamically adjusts the frequency of sending messages by each sub board according to the priority of each sub board when the bus load rate exceeds the expected range. The battery management system can reduce the bus load rate according to the data weight, achieves the reliability and safety of message information transmission of each sub board, and further improves the performance of the electric automobile.

Description

technical field [0001] The invention relates to the technical field of communication of a battery management system, in particular to a battery management system and an electric vehicle. Background technique [0002] Since Bosch first proposed CAN (Controller Area Network) at the SAE conference in 1986, it has been adopted due to its advantages of good real-time performance, reliability, flexibility, information resource sharing, greatly reduced connections, and easy expansion and maintenance. Widely used in various industries. Moreover, at present, whether it is a traditional car or a new energy vehicle, most of them use CAN as the vehicle communication method. However, there are still some problems that cannot be ignored on the CAN bus: as the amount of information transmitted in the CAN bus increases, the bus load rate will increase significantly, and when the bus load rate is too high, the transmission time of low-priority messages will be too long. long, and even pack...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the CAN bus load rate in the existing battery management system cannot be within an appropriate range, resulting in too high or too low bus load rate, it is difficult to adapt to the increasing voltage demand for the battery management system

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