CN217259906U

CN217259906U - Daisy chain communication converter for BMS and automobile

Info

Publication number: CN217259906U
Application number: CN202221044198.XU
Authority: CN
Inventors: 贺隆成; 瞿磊; 袁正; 李宗华
Original assignee: Chongqing Changan New Energy Automobile Technology Co Ltd
Current assignee: Deep Blue Automotive Technology Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-08-23
Anticipated expiration: 2032-04-29

Abstract

The utility model provides a daisy chain communication conversion equipment for BMS, include: the main board, the conversion board and the sub-board; the main controller is arranged on the main board; a plurality of single sampling chips for sampling each single data are arranged on the sub-plate; the conversion board is provided with a communication conversion chip in daisy chain communication with each single sampling chip and a micro-processing controller in SPI communication with the communication conversion chip; and the main controller is connected with the micro-processing controller through a CAN bus.

Description

Daisy chain communication converter for BMS and automobile

Technical Field

The utility model relates to a battery management field, concretely relates to daisy chain communication conversion equipment and car for BMS.

Background

BMS (Battery Management System) and battery Management system are one of the three core electricity of the electric automobile, namely the soul of the battery. The BMS is mainly used for monitoring the state of the battery, intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged and prolonging the service life of the battery.

The BMS has two main architectures, namely a centralized architecture and a distributed architecture, wherein the centralized architecture and the distributed architecture are compact in structure, high in reliability and low in cost, and are generally used in scenes with low capacity, low total pressure and small battery system volume, such as electric tools, electric bicycles and the like; the master control unit and the slave control unit are separated, namely, the master board and the slave boards are divided, hierarchical management can be better achieved, the slave boards can complete data acquisition work such as voltage acquisition and temperature acquisition, the slave boards send data to the master board after completing corresponding data acquisition, and the master board performs unified analysis and evaluation.

Distributed BMS framework that the volume production new forms of energy electric automobile of mainstream all adopted at present. The distributed architecture main board and sub-board data communication schemes mainly include two schemes, one scheme is transmission by CAN communication, and the other scheme is transmission by daisy chain communication. The former uses CAN frame message to directly communicate, which is relatively in line with the communication condition in the whole vehicle, but meets the CAN communication requirement, and each board is provided with a corresponding CAN chip or an MCU and a transceiver with a built-in CAN chip, which not only increases the cost of each board, but also increases the cost more the more boards are, and leads the layout and wiring of the boards to be more complicated; in the daisy chain communication, an MCU and a CAN transceiver are not required to be added in the sub-board, the layout of the sub-board CAN be optimized, the cost is saved, but the daisy chain cannot be directly communicated with the MCU.

SUMMERY OF THE UTILITY MODEL

For solving above-mentioned problem, can optimize branch board overall arrangement, save the cost, can guarantee the inside communication of BMS again, this scheme provides a daisy chain communication conversion equipment and car for BMS.

The technical scheme of the utility model is that:

the utility model provides a daisy chain communication conversion equipment for BMS, include: the main board, the conversion board and the sub-board;

the main controller is arranged on the main board;

a plurality of single sampling chips for sampling each single data are arranged on the sub-plate;

the conversion board is provided with a communication conversion chip in daisy chain communication with each single sampling chip and a micro-processing controller in SPI communication with the communication conversion chip;

and the main controller is connected with the micro-processing controller through a CAN bus.

Preferably, still be provided with on the mainboard with main control unit passes through CAN bus connection's first CAN transceiver, still be provided with on the subplate with the second CAN transceiver that microprocessor controller connects, first CAN transceiver pass through the CAN bus with the second CAN transceiver is connected.

The utility model also provides an automobile, including foretell daisy chain communication conversion equipment for BMS.

The utility model has the advantages that:

this scheme can realize BMS mainboard and the normal communication of minute board, and the mainboard can receive data such as monomer voltage, monomer temperature that the minute board was gathered, also can send awakening instruction, sampling instruction, balanced instruction to the minute board etc..

According to the scheme, on the basis of daisy chain communication, a communication conversion chip is added between a main board and a branch board, namely a conversion board is arranged. The main board and the conversion board are communicated through CAN frame message, the conversion board and the branch boards are communicated through a daisy chain, and the conversion board has two main functions, namely converting the branch board collected data transmitted by the daisy chain communication into CAN data when the branch board collected data is transmitted, and then transmitting the CAN data to the main controller of the main board for processing; when the main controller instruction of the main board is sent, the conversion board converts the CAN instruction into daisy chain communication and sends the daisy chain communication to the branch boards; the conversion board thus realizes the function of a bridge, connects the main board and the branch board and ensures communication between the main board and the branch board.

According to the scheme, daisy chain communication is kept while the BMS distributed architecture is followed, transmission data of all boards can be processed only by arranging one MCU on the branch boards, the cost can be reduced, and the distribution of the branch boards is simpler.

Drawings

FIG. 1 is a block diagram of the main board, sub-board and conversion board;

FIG. 2 is a flow chart of a data transmission process of the board-by-board acquisition;

FIG. 3 is a flow chart of motherboard instruction issue.

Detailed Description

Hereinafter, embodiments of the present embodiment will be described in detail with reference to the drawings.

As shown in fig. 1, the present embodiment provides a daisy chain communication converting apparatus for a BMS, including a main board 1, a sub board 3, and a conversion board 2. Wherein the conversion board 2 mainly comprises a communication conversion chip 201 (for example, MC 33664), a microprocessor controller 202, a second CAN transceiver 203, and some necessary external electronic components. The device is formed because the daisy chain communication is taken as SPI system communication, the conversion into SPI communication is more convenient, the SPI communication is a common on-board communication mode, and the conversion of the message into CAN by using the CAN built in the MCU is much easier. This scheme adopts two communication conversion chips 201 to constitute a loop, guarantees the stability of 3 monomer data transmission of minute board.

Fig. 2 is a flow chart of transmission of the data collected by the sub-board 3. After receiving a single data acquisition command sent by the main controller 101 on the main board 1, the micro-processing controller 202 on the sub-board 3 starts to acquire analog data, the acquired data is transmitted to the communication conversion chip 201 of the conversion board 2 in real time through a daisy chain, the communication conversion chip 201 converts the received single data into SPI data and then transmits the SPI data to the micro-processing controller 202 for processing, the CAN chip built in the micro-processing controller 202 decodes the received single data into CAN frame messages meeting the transmission requirements of the whole vehicle, and then the conversion board 2 sends the acquired single data to the first CAN transceiver 102 of the main board 1 through the second CAN transceiver 203 connected with the main board 1 in the form of the CAN frame messages, and finally the single data is received by the main controller 101 of the main board 1 and is subjected to subsequent data analysis and processing.

As shown in fig. 3, a flow chart of instruction sending of the main board 1 is shown, where a flow of instruction sending of the main board 1 is opposite to a flow of data transmission acquired by the sub-board 3: firstly, the main controller 101 sends a single data acquisition, equalization and other instructions to the second CAN transceiver 2031 on the conversion board 2 by a CAN frame message according to the working state of the sub-board 3, and the instructions are sent to the conversion board 2 through the main board 1 and the first CAN transceiver 102 connected to the conversion board 2 and received by the micro-processing controller 202; then, the micro-processing controller 202 decodes the received CAN frame command into an SPI command and transmits the SPI command to the communication conversion chip 201, the communication conversion chip 201 receives the SPI command and analyzes the SPI command into daisy chain communication, and the communication conversion chip 3 transmits the daisy chain communication to the slave board 3, and finally, the slave board 3 receives and executes the SPI command.

Claims

1. A daisy chain communication conversion apparatus for a BMS, comprising: the device comprises a main board (1), a conversion board (2) and a branch board (3);

a main controller (101) is arranged on the main board (1);

a plurality of single sampling chips (301) for sampling each single data are arranged on the sub-plate (3);

the conversion board (2) is provided with a communication conversion chip (201) which is in daisy chain communication with each single sampling chip (301), and a microprocessor controller (202) which is in SPI communication with the communication conversion chip (201);

the main controller (101) is connected with the micro-processing controller (202) through a CAN bus.

2. The daisy chain communication converting device for BMS according to claim 1, wherein a first CAN transceiver (102) connected with the main controller (101) through a CAN bus is further provided on the main board (1), a second CAN transceiver (203) connected with the micro-processing controller (202) is further provided on the sub board (3), and the first CAN transceiver (102) is connected with the second CAN transceiver (203) through a CAN bus.

3. An automobile, comprising the daisy chain communication converting apparatus for a BMS according to claim 1 or 2.