BMS slave plate and BMS system

Abstract

The utility model discloses a BMS slave board and a BMS system, the BMS slave board is used for being connected with a BMS main board, the BMS slave board comprises a bridge chip, a transceiver and a sampling chip, the bridge chip comprises a communication module and a communication port, the bridge chip is connected with the transceiver through the communication module and is connected with the sampling chip through the communication port, the BMS slave board is connected with the BMS main board through the transceiver, and the BMS main board is connected with the BMS slave board through the transceiver. The BMS slave board is connected with the to-be-collected component through the sampling chip so as to acquire analog quantity data of the to-be-collected component. According to the embodiment of the utility model, the bridge chip is adopted to replace the MCU, the cost of arranging the MCU and the corresponding peripheral circuit on the BMS slave board in the traditional technology is saved, and the BMS slave board is not provided with the MCU, so that software does not need to be manually developed and maintained for the MCU.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle batteries, in particular to a BMS slave board and a BMS system. Background Art

[0002] With the development of electric vehicle technology, the battery management system (BMS) on electric vehicles mainly adopts a distributed architecture, that is, usually a BMS main board and multiple BMS slave boards are provided. The BMS slave boards detect the status of the batteries on the electric vehicles and send the battery data obtained by the detection to the BMS main board.

[0003] In the existing BMS slave boards, each BMS slave board is provided with an MCU (Microcontroller Unit), resulting in a high cost of the BMS slave board. In addition, supporting software needs to be developed for the MCU on the slave board, which requires a large amount of manpower for development and maintenance. Utility Model Content

[0004] The purpose of the utility model is to provide a BMS slave board and a BMS system to solve the problem that the BMS slave board needs to be equipped with an MCU, resulting in high costs and requiring human maintenance. To solve the above problems, the embodiment of the utility model adopts the following technical solutions:

[0005] In a first aspect, a BMS slave board is provided, the BMS slave board is used to connect to a BMS main board, and includes a bridge chip, a transceiver, and a sampling chip, the bridge chip includes a communication module and a communication port, the bridge chip is connected to the transceiver through the communication module, and is connected to the sampling chip through the communication port;

[0006] The BMS slave board is connected to the BMS main board through the transceiver, and the BMS slave board is connected to the battery sensor through the sampling chip to obtain analog data of the battery through the battery sensor.

[0007] Optionally, the transceiver is a CAN transceiver.

[0008] Optionally, the bridge chip and the BMS mainboard further include a wake-up port, and the wake-up port of the bridge chip is connected to the wake-up port of the BMS mainboard.

[0009] Optionally, there are multiple sampling chips, and the multiple sampling chips are connected in series to form a communication daisy chain. The communication port includes a first communication port, and a first end of the communication daisy chain is connected to the first communication port.

[0010] Optionally, the communication port further includes a second communication port, and the second end of the communication daisy chain is connected to the second communication port.

[0011] Optionally, the bridge chip also includes an ID configuration module.

[0012] Optionally, the sampling chip further includes a power supply interface, and the power supply interface is connected to the battery.

[0013] In a second aspect, a BMS system is provided, comprising a BMS main board and the BMS slave board described in any one of the first aspects, wherein the BMS main board comprises an MCU and a transceiver connected to the MCU, and the transceiver of the BMS slave board is connected to the transceiver of the BMS main board via a communication bus.

[0014] Optionally, there are multiple BMS slave boards, and the transceivers of the multiple BMS slave boards are connected to the transceiver of the BMS main board through the communication bus.

[0015] Optionally, the wake-up port of each of the BMS slave boards is connected to the wake-up port of the BMS main board via a wake-up bus.

[0016] The BMS slave board of this embodiment includes a bridge chip, a transceiver and a sampling chip, wherein the bridge chip includes a communication module and a communication port, the bridge chip is connected to the transceiver through the communication module, connected to the sampling chip through the communication port, and the sampling chip is connected to the battery sensor to obtain analog data of the battery, so that the BMS slave board can communicate with the BMS main board through the transceiver, thereby realizing the use of a bridge chip to replace the MCU, saving the cost of setting the MCU and corresponding peripheral circuits on the BMS slave board in traditional technology, and the BMS slave board has no MCU, so there is no need for manpower to develop and maintain software for the MCU. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below based on the drawings and embodiments.

[0018] Figure 1 The figure is a schematic diagram of the framework of a BMS slave board according to an embodiment of the utility model.

[0019] Figure 2 This is a schematic diagram of the framework of a BMS slave board according to another embodiment of the utility model.

[0020] Figure 3 This is a schematic diagram of the framework of a BMS slave board according to another embodiment of the utility model.

[0021] Figure 4 1 is a circuit schematic diagram of a transceiver in an embodiment of the utility model.

[0022] Figure 5This is a circuit schematic diagram of the bridge chip in the embodiment of the utility model.

[0023] Figure 6 The schematic diagram of the framework of a BMS system according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the framework of a BMS system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Embodiment 1

[0028] Figure 1 The schematic diagram of the framework of the BMS slave board provided in the first embodiment of the utility model, in this embodiment, the BMS slave board 1 is connected to the BMS main board and the battery respectively, and is used to obtain the analog data of the battery and transmit it to the BMS main board, wherein a battery sensor may be provided on the battery, for example, the battery sensor may be a temperature sensor and a humidity sensor for detecting the temperature and humidity of the battery, and may also be a smoke sensor, etc. The BMS slave board 1 is connected to the battery sensor of the battery to obtain the analog data of the battery through the battery sensor.

[0029] like Figure 1As shown, the BMS slave board 1 of this embodiment includes a bridge chip 10, a transceiver 11 and a sampling chip 12, wherein the bridge chip 10, the transceiver 11 and the sampling chip 12 can be arranged on a dielectric substrate and electrically connected through circuit wiring on the dielectric substrate. The bridge chip 10 can include a communication module 101 and a communication port 102, wherein the bridge chip 10 is connected to the transceiver 11 through the communication module 101, and is connected to the sampling chip 12 through the communication port 102, wherein the bridge chip 10 of this embodiment can be a communication bridge chip, such as a battery management communication gateway and a transport layer transceiver, and the bridge chip 10 can forward data from different ports through a standard communication protocol. In this embodiment, the bridge chip 10 can forward data from the communication port 102 to the communication module 101 through a standard communication protocol. The sampling chip 12 is connected to the battery sensor to receive the analog data of the battery collected by the battery sensor, such as obtaining the battery voltage, temperature, humidity, pressure and other data.

[0030] like Figure 1 As shown, the BMS slave board 1 is connected to the BMS main board through the transceiver 11, and the BMS slave board 1 is connected to the battery sensor of the battery through the sampling chip 12 to obtain the analog data of the battery. After the bridge chip 10 receives the analog data of the battery from the sampling chip 12 through the communication port 102, it is output to the communication module 101 after the communication protocol conversion, and then output to the transceiver 11 through the communication module 101, and then output to the BMS main board via the transceiver 11. Since the bridge chip 10 has the communication protocol conversion and communication functions, there is no need to set the MCU and related peripheral circuits on the BMS slave board, which saves hardware costs and does not require the development and maintenance of software for the MCU.

[0031] Exemplarily, the transceiver 11 can be a transceiver of various communication modes, such as a CAN (Controller Area Network), SPI (Serial Peripheral Interface), or UART (Universal Asynchronous Receiver / Transmitter) transceiver. Preferably, the transceiver 11 can be a CAN transceiver, and the communication port 102 can be an SPI or UART port. After the bridge chip 10 receives data from the sampling chip 12 through the SPI port or the UART port, it converts the received data through the SPI or UART to CAN communication conversion protocol and outputs it to the communication module 101, so as to output data that complies with CAN bus transmission to the CAN transceiver through the communication module 101, so that the BMS slave board 1 can communicate with the BMS main board through the CAN bus, thereby ensuring the communication distance and anti-interference capability between the BMS slave board and the BMS main board.

[0032] Embodiment 2

[0033] Figure 2 A schematic diagram of a BMS slave board provided in the second embodiment of the utility model is shown in FIG. Figure 2 As shown, in one embodiment, the bridge chip 10 on the BMS slave board 1 and the BMS main board are both provided with a wake-up port 103, and the wake-up port 103 of the bridge chip 10 is connected to the wake-up port of the BMS main board, so that the bridge chip 10 in the BMS slave board 1 can wake up the BMS main board through the wake-up port 103. For example, in an electric vehicle, when the entire vehicle is in hibernation, when the sampling chip 12 detects that the battery cell is undervoltage, overvoltage, or overtemperature, the sampling chip 12 can wake up the bridge chip 10, and the bridge chip 10 reversely wakes up the BMS main board through the wake-up port 103, and performs fault and alarm processing through the BMS main board.

[0034] Embodiment 3

[0035] In this embodiment, if Figure 2 As shown, the number of sampling chips 12 on the BMS slave board 1 is multiple, each sampling chip 12 is connected to the battery sensor, and the multiple sampling chips 12 are connected in series to form a communication daisy chain. The communication port 102 includes a first communication port 1021. The first end of the communication daisy chain formed by the multiple sampling chips 12 in series is connected to the first communication port 1021. The multiple sampling chips 12 are connected in series to form a communication daisy chain. Multiple sampling chips can be connected in series through signal lines without bus competition and blocking, and it is convenient to increase or decrease the sampling chips 12.

[0036] like Figure 3 As shown, in an optional embodiment, the communication port 102 further includes a second communication port 1022, and the second end of the communication daisy chain is connected to the second communication port 1022, that is, the first end of the communication daisy chain formed by multiple sampling chips 12 in series is connected to the first communication port 1021, and the second end is connected to the second communication port 1022, forming a bidirectional daisy chain communication. Even if one node in the bidirectional daisy chain is disconnected, the sampling chips 12 at both ends of the disconnected node can still transmit data to the first communication port 1021 or the second communication port 1022, thereby improving the reliability of the daisy chain communication.

[0037] like Figure 3 As shown, in another embodiment, the bridge chip 10 also includes an ID configuration module 104, which can be used to configure the ID of the BMS slave board 1 to set IDs for multiple BMS slave boards in the BMS distributed architecture, so that the BMS main board can identify the source of the received data through the ID.

[0038] In an optional embodiment, the sampling chip 12 may further include a power supply interface, which is connected to a battery to draw power from the battery. That is, the sampling chip 12 can draw power from the battery connected thereto through the power supply interface, thereby achieving local power supply, shortening the power supply line of the sampling chip 12, and simplifying the circuit design of the entire BMS slave board.

[0039] like Figure 4 The schematic diagram of the circuit of the transceiver 11 in the BMS slave board 1 is shown. Figure 5 Shown is a circuit schematic diagram of the bridge chip 10 in the BMS slave board 1.

[0040] like Figure 4 and Figure 5 As shown, taking the transceiver 11 as a CAN transceiver as an example, it is provided with CAN output ports ICANH and ICANL, and the CAN output ports ICANH and ICANL are connected to the BMS mainboard through the CAN bus. The transceiver 11 is also provided with ports UART_N and STP_N for connecting to the bridge chip 10. In the bridge chip 10, the bridge chip 10 is provided with a first communication port (RXTX0P, RXTX0N) and a second communication port (RXTX1P, RXTX1N) for connecting a communication daisy chain, and is provided with an interface GPIO0 to connect a wake-up circuit, which is connected to the wake-up port of the BMS mainboard through the output terminal CMC_WAKE of the wake-up circuit.

[0041] In this embodiment, the model of the transceiver 11 may be NXP TJA1043, the model of the bridge chip 10 may be NXP MC33665A, and the model of the sampling chip 12 may be MC33771A, MC33774A, MC33775A, etc. This embodiment does not limit the models of the transceiver, bridge chip, and sampling chip.

[0042] like Figure 4 and Figure 5 As shown, when the sampling chip outputs data to the bridge chip U2 through the first communication port (RXTX0P, RXTX0N) and the second communication port (RXTX1P, RXTX1N), the bridge chip U2 outputs data from ports UART_N and STP_N to the transceiver U1 after protocol conversion. The transceiver U1 converts the data into data that conforms to CAN transmission and outputs it to the BMS mainboard from the CAN output ports ICANH and ICANL.

[0043] When the sampling chip detects a battery abnormality, such as undervoltage, overvoltage, overcurrent or overtemperature, the bridge chip U2 outputs a wake-up signal from GPIO0. The wake-up signal is output from the GPIO0 port and processed by the circuit. It is output from the CMC_WAKE port to the wake-up port of the BMS mainboard to wake up the BMS mainboard in sleep mode.

[0044] Embodiment 4

[0045] like Figure 6 As shown, the fourth embodiment provides a BMS system, which includes a BMS main board 2 and a BMS slave board 1 of the present embodiment, wherein the BMS main board 2 includes an MCU 21 and a transceiver 11 connected to the MCU 21, and the transceiver 11 of the BMS slave board 1 is connected to the transceiver 11 of the BMS main board 2 through a communication bus 4, wherein the transceiver 11 may be a CAN transceiver, and the communication bus 4 may be a CAN bus. Specifically, the BMS slave board 1 includes a bridge chip 10, a transceiver 11, and a sampling chip 12, wherein the bridge chip 10 may include a communication module 101 and a communication port 102, the bridge chip 10 is connected to the transceiver 11 through the communication module 101, and is connected to the sampling chip 12 through the communication port 102, and the sampling chip 12 is connected to the battery sensor of the battery 3.

[0046] like Figure 7 As shown, in another embodiment, the number of BMS slave boards 1 in the BMS system can be multiple, the transceivers 11 of the multiple BMS slave boards 1 are connected to the transceiver 11 of the BMS main board 2 through the communication bus 4, and the wake-up port of each BMS slave board 1 is connected to the wake-up port of the BMS main board 2 through the wake-up bus 5.

[0047] In the BMS system of this embodiment, the BMS slave board includes a bridge chip, a transceiver and a sampling chip, wherein the bridge chip includes a communication module and a communication port, the bridge chip is connected to the transceiver through the communication module, connected to the sampling chip through the communication port, and the sampling chip is connected to the battery sensor to obtain analog data of the battery, so that the BMS slave board can communicate with the BMS main board through the transceiver, thereby realizing the use of a bridge chip to replace the MCU, saving the cost of setting the MCU and corresponding peripheral circuits on the BMS slave board in traditional technology, and the BMS slave board has no MCU, and no manpower is required to develop and maintain software for the MCU.

[0048] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the purpose of clarifying the device. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A BMS slave board, characterized in that: The BMS slave board is used to connect to the BMS main board, and includes a bridge chip, a transceiver and a sampling chip. The bridge chip includes a communication module and a communication port. The bridge chip is connected to the transceiver through the communication module, and is connected to the sampling chip through the communication port. The BMS slave board is connected to the BMS main board through the transceiver, and the BMS slave board is connected to the battery sensor through the sampling chip to obtain analog data of the battery through the battery sensor.

2. The BMS slave board according to claim 1, characterized in that: The transceiver is a CAN transceiver.

3. The BMS slave board according to claim 1, characterized in that: The bridge chip and the BMS mainboard further include a wake-up port, and the wake-up port of the bridge chip is connected to the wake-up port of the BMS mainboard.

4. The BMS slave board according to claim 1, characterized in that: There are multiple sampling chips, and the multiple sampling chips are connected in series to form a communication daisy chain. The communication port includes a first communication port, and a first end of the communication daisy chain is connected to the first communication port.

5. The BMS slave board according to claim 4, characterized in that: The communication port further includes a second communication port, and a second end of the communication daisy chain is connected to the second communication port.

6. The BMS slave board according to claim 1, characterized in that: The bridge chip also includes an ID configuration module.

7. The BMS slave board according to any one of claims 1 to 6, characterized in that: The sampling chip also includes a power supply interface, and the power supply interface is connected to the battery.

8. A BMS system, characterized in that: It comprises a BMS main board and the BMS slave board according to any one of claims 1 to 7, wherein the BMS main board comprises an MCU and a transceiver connected to the MCU, and the transceiver of the BMS slave board is connected to the transceiver of the BMS main board through a communication bus.

9. The BMS system according to claim 8, characterized in that: There are multiple BMS slave boards, and the transceivers of the multiple BMS slave boards are connected to the transceiver of the BMS main board through the communication bus.

10. The BMS system according to claim 9, characterized in that: The wake-up port of each of the BMS slave boards is connected to the wake-up port of the BMS main board via a wake-up bus.

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