Battery Management System and Electric Vehicle

A battery management system and battery cell technology, applied in electric vehicles, battery/fuel cell control devices, vehicle components, etc., can solve problems such as difficulty in adapting to battery management system requirements, achieve reliability and safety, and score accurately , the effect of improving performance

Active Publication Date: 2020-11-20
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Battery Management System and Electric Vehicle
  • Battery Management System and Electric Vehicle
  • Battery Management System and Electric Vehicle

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Experimental program
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Embodiment Construction

[0036] The present invention will be described below in conjunction with the accompanying drawings.

[0037] to combine figure 1 and figure 2 As shown, they are respectively a structural block diagram and a working principle diagram of a battery management system for an electric vehicle provided by the present invention. The battery management system includes several battery cells, a main board and several sub-boards, and each sub-board corresponds to a plurality of battery cells. monomer. Such as figure 1 It can be understood that the battery cells are divided into a plurality of battery cell groups, each sub-board corresponds to a battery cell group, and each battery cell group includes the plurality of battery cells. Each sub-board interacts with the main board through the CAN bus, figure 2 It can also be referred to as a communication flowchart between the main board and the sub-board. The main board obtains the corresponding number of messages and the retransmission...

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Abstract

The present invention provides an electric vehicle and its battery management system. The system includes a main board, several sub-boards and several battery cells. The transmission rate and then calculate the bus load rate of the CAN bus during this time period; the main board also obtains the temperature information and voltage information of the battery cells corresponding to each sub-board within this time period, and the main board / sub-board according to the The variance of the average temperature and the variance of the average voltage are respectively calculated by the scoring parameters obtained by the sorting algorithm to obtain the score of the sub-board, and then the priority of the sub-board is obtained; the main board judges whether the bus load rate is within the expected range, and combines each The priority of the sub-boards dynamically adjusts the frequency at which each sub-board sends packets. The battery management system can reduce the bus load rate according to the data weight, realize the reliability and security of the message information transmission of each sub-board, and then improve the performance of the electric vehicle.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L58/18
CPCY02T10/70
Inventor 杨世春华旸金鑫娜潘宇巍闫啸宇杨鹏
Owner BEIHANG UNIV
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