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Battery management system for vehicle

A battery management system and vehicle technology, which is applied to secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as increasing the deviation between measured values ​​and actual values, limiting the location of BMS layout, and affecting vehicles, etc., to achieve improved The effect of precision

Inactive Publication Date: 2020-06-02
HELLA SHANGHAI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional battery management system, the slave board often takes power from the battery cell, so the battery cell not only needs to provide resistance consumption during equalization, but also supplies power to the slave board, which increases the gap between the measured value and the actual value. The deviation affects the estimation of the remaining battery capacity (SOC), affects the deviation of the vehicle's estimation of the overall battery power supply time, and affects the user experience; in addition, the main board and the slave board in the traditional BMS use a daisy chain between the slave board and the slave board. Communication mode, each slave board has an "input" and "output" interface, the input of each slave board is connected to the output interface of the next slave board, and slave board #N-1 will send data to slave board# N, slave board #N will send its own data and #N-1 data to slave board #N+1
Therefore, one of the advantages of the daisy chain is that if the middle of the daisy chain is disconnected, the following slave boards can still continue to communicate and transmit data. At the same time, the disadvantages are also obvious. The slave board connected to the main board has the heaviest task and consumes the most power.
Moreover, this communication method not only limits the length of the communication cable, the data transmission rate is low, but also leads to poor anti-interference of the electromagnetic compatibility (EMC) of the system
In the complex electromagnetic environment of the current vehicle, frame loss or communication interruption is prone to occur, which limits the location of the BMS in the vehicle and affects the space optimization requirements of the vehicle.

Method used

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Embodiment 1

[0017] The following provides specific embodiments of the battery management system for vehicles in accordance with the present invention. In this embodiment, the battery management system mainly includes: a main board, a slave board and a battery module. In this embodiment, the main board and the slave board If a standardized interface is set on both boards, the main board and the slave board are connected through the standardized interface, so that not only data communication can be performed between the main board and the slave board, but also power can be supplied to the slave board through the main board; at the same time, the battery module and the slave board can be connected If it is electrically connected, the battery module no longer needs to supply power to the slave board, but only provides data such as voltage to the slave board, so that the power supply from the slave board is separated from the battery cells in the battery module. During equalization, there is no...

Embodiment 2

[0020] see figure 1 , which is a structural diagram of a star-structured battery management system according to a preferred embodiment of the present invention. It can be seen from the figure that the battery management system provided in this embodiment includes a main board, N slave boards, and N battery modules, and each battery module may include M battery cells according to actual needs . In this embodiment, the main board and the N slave boards are respectively provided with standardized interfaces, wherein the main board is provided with N standardized interfaces, and each slave board is provided with a standardized interface, then each slave board passes through the standardized interface It is directly connected to the main board to realize data communication with the main board and take power from the main board; at the same time, each slave board is electrically connected to a battery module including M battery cells, and the voltage is collected from each battery ...

Embodiment 3

[0022] refer to figure 2 , which is a schematic structural diagram of a battery management system with a ring structure according to a preferred embodiment of the present invention. It can be seen from the figure that the battery management system provided in this embodiment includes a main board, N slave boards, and N battery modules, and each battery module may include M battery cells according to actual needs . In this embodiment, the main board and the N slave boards are respectively provided with standardized interfaces, wherein the main board is provided with two standardized interfaces, and each slave board is provided with two standardized interfaces, then the main board communicates with the two Slave board connection, the above two slave boards are connected in series with N-2 slave boards through the standardized interfaces on them, that is, N slave boards are connected to each other through the standardized interfaces on them, forming a long chain, a long chain ...

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Abstract

The invention provides a battery management system for a vehicle. According to the invention, the connection between a main board and slave boards or between the slave boards is realized by utilizinga standardized interface, so that the main board can carry out data communication with the slave boards, can supply power to the slave boards, the power supply of the slave boards is stripped from thebattery module, and the voltage sampling accuracy of the battery module is greatly improved.

Description

technical field [0001] The invention relates to the technical field of vehicle spare parts, in particular to a battery management system for vehicles. Background technique [0002] The battery management system (BMS) is a system that manages the battery. It usually has the function of measuring the battery voltage to prevent or avoid abnormal conditions such as battery over-discharge, over-charge, and over-temperature. It is one of the three core areas of new energy vehicles. . [0003] In the traditional battery management system, the slave board often takes power from the battery cell, so the battery cell not only needs to provide resistance consumption during equalization, but also supplies power to the slave board, which increases the gap between the measured value and the actual value. The deviation affects the estimation of the remaining battery capacity (SOC), affects the deviation of the vehicle's estimation of the overall battery power supply time, and affects the ...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/48
CPCH01M10/425H01M10/48Y02E60/10
Inventor 王海涛胡杰
Owner HELLA SHANGHAI ELECTRONICS