BMS parallel operation capacity expansion identification circuit

Abstract

The utility model discloses a BMS (Battery Management System) parallel operation capacity expansion identification circuit, which is provided with a master-slave machine identification module, a communication module and a master control module, and is characterized in that a second interface unit transmits an access signal of an external module identified by the master-slave machine identification module to a CAN (Controller Area Network) transceiver; the CAN transceiver processes an access signal and sends a level signal corresponding to the access signal to the main control module through the first interface unit, the main control module sends a control signal to the external module according to the level signal and identifies the state information of the external module, the circuit can accurately identify the state information of the newly-added BMS and / or the battery pack, the circulation problem is effectively avoided, and the service life of the battery pack is prolonged. And meanwhile, the system has the advantages of simple structure, low cost, intelligent and flexible control, reliable communication and the like, and the working safety and stability of the BMS parallel operation capacity expansion system are improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery management system technology, and in particular relates to a BMS parallel expansion identification circuit. Background Technology

[0002] With the increasing demand for battery capacity in energy storage applications, a single Battery Management System (BMS) often struggles to meet the requirements of large-capacity energy storage, necessitating parallel expansion of BMS. However, existing BMS parallel expansion solutions suffer from the following problems: accurately identifying the status information of the new BMS and battery pack during parallel operation, such as the battery's state of charge (SOC), state of health (SOH), and voltage, can lead to significant parameter differences between different battery packs. Direct parallel operation can easily trigger circulating current issues, causing overcharging and over-discharging of the batteries, severely impacting their lifespan and safety. Therefore, it is necessary to provide a BMS parallel expansion identification circuit to address the aforementioned technical problems. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a BMS parallel expansion identification circuit, which can realize the safe and efficient parallel expansion of multiple BMS units, effectively avoid circulating current problems, has a simple circuit structure, and improves the accuracy of identifying the status information of newly added BMS and battery packs, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a BMS parallel expansion identification circuit, including a master-slave identification module, a communication module, and a master control module, wherein the master-slave identification module and the communication module are both connected to the master control module;

[0006] The communication module includes a first interface unit, a CAN transceiver, and a second interface unit connected to the main control module. The CAN transceiver and the master-slave identification module are both connected to the second interface unit. The master-slave identification module is used to access external modules.

[0007] The second interface unit sends the access signal of the external module identified by the master-slave identification module to the CAN transceiver. The CAN transceiver processes the access signal and sends the corresponding level signal to the master control module through the first interface unit. The master control module sends a control signal to the external module according to the level signal and identifies the status information of the external module. The status information includes at least one of state of charge, health status, or voltage.

[0008] As a preferred embodiment of the above technical solution, the master-slave identification module includes a master identification circuit and a slave identification circuit. Both the master identification circuit and the slave identification circuit are connected to the second interface unit. The master identification circuit is used to access the BMS unit, and the slave identification circuit is used to access the battery pack.

[0009] As a preferred embodiment of the above technical solution, the host identification circuit includes a first terminal and a first amplification unit. The first terminal is connected to the first amplification unit. The first terminal is used to receive the input power supply VCC of the BMS unit, and the first amplification unit is used to output a high-level signal corresponding to the input power supply VCC to the main control module.

[0010] As a preferred embodiment of the above technical solution, the slave identification circuit includes a second terminal and a second amplification unit. The second terminal is connected to the second amplification unit, and the second terminal is used to connect to the battery pack. The second amplification unit processes the output power of the battery pack and outputs it to the CAN transceiver.

[0011] As a preferred embodiment of the above technical solution, the first amplification unit and the second amplification unit include multiple resistors, capacitors, diodes and transistors.

[0012] As a preferred embodiment of the above technical solution, the communication module further includes a TVS protection circuit connected to the CAN transceiver and the second interface unit, the TVS protection circuit including two bidirectional TVS diodes connected in parallel.

[0013] As a preferred embodiment of the above technical solution, the CAN transceiver includes a chip U9 with the model number SN65HVD230.

[0014] As a preferred embodiment of the above technical solution, the communication module further includes multiple resistors and capacitors connected to the chip U9.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] By setting up a master-slave identification module, a communication module, and a master control module, the second interface unit sends the access signal of the external module identified by the master-slave identification module to the CAN transceiver. The CAN transceiver processes the access signal and sends the corresponding level signal to the master control module through the first interface unit. The master control module sends control signals to the external module according to the level signal and identifies the status information of the external module. The circuit can accurately identify the status information of the newly added BMS and / or battery pack, effectively avoiding the circulating current problem. At the same time, it has the advantages of simple structure, low cost, intelligent and flexible control, and reliable communication, which improves the working safety and stability of the BMS parallel expansion system. Attached Figure Description

[0017] Figure 1 This is a structural block diagram of the BMS parallel expansion identification circuit proposed in this utility model;

[0018] Figure 2 This is a circuit diagram of the host identification circuit proposed in this utility model;

[0019] Figure 3 This is a circuit diagram of the slave identification circuit proposed in this utility model;

[0020] Figure 4 This is a circuit diagram of the communication module proposed in this utility model.

[0021] The symbols for the main components are explained as follows: 10-Master-Slave Identification Module; 11-Master Identification Circuit; 12-First Terminal; 13-First Amplification Unit; 14-Slave Identification Circuit; 15-Second Terminal; 16-Second Amplification Unit; 20-Communication Module; 21-First Interface Unit; 22-CAN Transceiver; 23-Second Interface Unit; 24-TVS Protection Circuit; 30-Master Control Module. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] See Figure 1 , Figure 2 , Figure 3 and Figure 4 This utility model provides a BMS parallel expansion identification circuit, including a master-slave identification module 10, a communication module 20 and a master control module 30, wherein the master-slave identification module 10 and the communication module 20 are both connected to the master control module 30;

[0024] The communication module 20 includes a first interface unit 21, a CAN transceiver 22, and a second interface unit 23 connected to the main control module 30. The CAN transceiver 22 and the master-slave identification module 10 are both connected to the second interface unit 23. The master-slave identification module 10 is used to access external modules.

[0025] The second interface unit 23 sends the access signal of the external module identified by the master-slave identification module 10 to the CAN transceiver 22. The CAN transceiver 22 processes the access signal and sends the level signal corresponding to the access signal to the master control module 30 through the first interface unit 21. The master control module 30 sends a control signal to the external module according to the level signal and identifies the status information of the external module. The status information includes at least one of state of charge, health status, or voltage.

[0026] In this embodiment, the master-slave identification module 10 includes a master identification circuit 11 and a slave identification circuit 14. Both the master identification circuit 11 and the slave identification circuit 14 are connected to the second interface unit 23. The master identification circuit 11 is used to access the BMS unit, and the slave identification circuit 14 is used to access the battery pack. The master identification circuit 11 includes a first terminal 12 and a first amplification unit 13. The first terminal 12 is connected to the first amplification unit 13. The first terminal 12 is used to receive the input power supply VCC of the BMS unit, and the first amplification unit 13 is used to output a high-level signal corresponding to the input power supply VCC to the master control module 30. The slave identification circuit 14 includes a second terminal 15 and a second amplification unit 16. The second terminal 15 is connected to the second amplification unit 16. The second terminal 15 is used to connect to the battery pack, and the second amplification unit 16 processes the output power of the battery pack and outputs it to the CAN transceiver 22.

[0027] It should be noted that the first amplification unit 13 and the second amplification unit 16 include multiple resistors, capacitors, diodes, and transistors. The communication module 20 also includes a TVS protection circuit 24 connected to the CAN transceiver 22 and the second interface unit 23. The TVS protection circuit 24 includes two bidirectional TVS diodes connected in parallel. The CAN transceiver 22 includes a chip U9 of model SN65HVD230. The communication module 20 also includes multiple resistors and capacitors connected to the chip U9. Both the first amplification unit 13 and the second amplification unit 16 are S8050 transistors. The first terminal 12 is a six-pin terminal J10, and the second terminal 15 is an eight-pin terminal J11. The first interface unit 21 is a CAN bus and can transmit and receive data. The second interface unit 23 is for inputting or outputting high and low level signals (CAN_H, CAN_L). The TVS protection circuit 24 between the CAN transceiver 22 and the second interface unit 23 can improve the surge protection or electrostatic discharge protection capability of the CAN transceiver 22.

[0028] Specifically, such as Figure 2As shown, the host identification circuit 11 includes terminal J10, resistors R152, R153, R154, R155, R162, R164, transistor A46, TVS diode ZD24, diode D26, capacitor C84, and capacitor C86. Pin 5 of terminal J10 is connected to one end of resistor R162, and the other end of resistor R162 is connected to the cathode of diode D26. The anode of diode D26 is used to connect to the power supply VCC. Pins 3 and 4 of terminal J10 are connected to capacitor C86, and pin 5 of terminal J10 is connected to resistor R162. 6 is connected to one end of resistor R164, the other end of resistor R164 is connected to resistor R155, resistor R155 is connected to resistor R154 and the cathode of TVS diode ZD24, one end of resistor R157 is connected to resistor R154 and the base of transistor Q46, the emitter of transistor Q46 is connected to the other end of resistor R157, the anode of TVS diode ZD24 and capacitor C84 and grounded, the collector of transistor Q46 is connected to resistor R153 and one end of resistor R152, the other end of resistor R152 is connected to capacitor C84 and receives the S2M_FromAUXBMS_MCU control signal.

[0029] Specifically, such as Figure 3 As shown, the slave identification circuit 14 includes terminal J11, resistors R174 and R175, capacitor C93, diode D27, resistor R179, TVS diode ZD25, resistor R178, resistor R180, transistor Q47, resistor R177, and capacitor C95. Pins 3 and 4 of terminal J11 are connected to capacitor C93. Pin 5 of terminal J11 is connected to one end of resistor R174. The other end of resistor R174 is connected to the anode of diode D27 and one end of resistor R179. Pin 6 of terminal J11 is connected to one end of resistor R175. Resistor R1... The other end of resistor R75 is connected to the cathode of diode D27. The other end of resistor R179 is connected to the cathode of TVS diode ZD25 and resistor R178. The anode of TVS diode ZD25 is connected to one end of resistor R180, the emitter of transistor Q47, and capacitor C95 and grounded. The other end of resistor R180 is connected to resistor R178 and the base of transistor Q47. The collector of transistor Q47 is connected to one end of resistor R176 and resistor R177. The other end of resistor R177 is connected to capacitor C95 and outputs the M2S_ToAUXBMS_MCU control signal.

[0030] Specifically, such as Figure 4As shown, the communication module 20 includes a chip U9, resistors R166, R167, R168, R170, R171, and R172, capacitors C87, C88, C89, C91, C92, and C104, inductors FB1 and FB2, and a TVS protection circuit. Capacitors C87 and C89 are connected to pin 3 of the chip U9. One end of resistor R167 is connected to pin 1 of the chip U9 and capacitor C92; the other end of resistor R167 is the output terminal CAN_TXA of the first interface unit. One end of resistor R171 is connected to pin 4 of the chip U9; the other end of resistor R171 is connected to capacitor C91 and serves as the first interface. The input terminal CAN_RXA of unit 21 is connected to capacitors C91 and C92 and grounded. Resistor R172 is connected to pins 2 and 8 of chip U9. Capacitor C104 is connected to pin 5 of chip U9. One end of resistor R166 is connected to pin 7 of chip U9, one end of inductor FB1, and a bidirectional TVS diode. The other end of inductor FB1 is connected to one end of resistor R168, which is connected to CAN_H of the second interface unit 23. The other end of resistor R166 is connected to one end of inductor FB2, pin 6 of chip U9, and a bidirectional TVS diode. The other end of inductor FB2 is connected to one end of resistor R170, which is connected to CAN_L of the second interface unit 23. Pins 1 and 2 of terminal J10 and terminal J11 are also connected to the second interface unit 23.

[0031] As described above, the main control module 30 is an MCU, and the master-slave identification module 10 can be composed of multiple MOSFETs, diodes, and a power supply. It is used to determine the access signal of external modules and, based on the control signal identified by the main control module 30, determines the master / slave status, ensuring that only BMS (units) and battery packs with parameter differences within the allowable range can be integrated into the system. The communication module is responsible for communication between the various BMSs and between the BMS and the main control module 30. A reliable communication protocol (CANopen) is used to ensure the real-time performance and accuracy of communication. It has communication error detection and correction functions, enabling timely detection and handling of errors occurring during communication, thus ensuring system stability.

[0032] The above-described identification process of the master-slave identification module 10 includes: the master-slave identification module 10 connects the master J10 and the slave J11 through a ribbon cable. When any key is pressed on the master / slave, the entire system can be woken up through the KEY_TOMBMS signal (pin 4), and the auxiliary power supply of the system is turned on. After the system is turned on, the master VCC-5V1 power supply is connected to the slave J11-5 through pin J10-5, forming a circuit through pin 6, which turns on the transistor Q46 at a high level, pulling down the S2M0FromAUXBMS0MC signal. The MCU determines that the slave is connected through the pulled-down S2M0FromAUXBMS0MC signal. Similarly, the slave's M2S_ToAUXBMS_MCU signal is also pulled down at this time, indicating that the connection with the master is successful. The interaction process of the communication module 20 includes: the host MCU communicates with the slave device via U9 through CAN to transmit the slave device's power SOC, voltage, current and other status information. When the host and slave device identification signals are connected, the host and slave device identification module 10 interacts with data through CAN communication. If the communication is successful, control and parallel operation are performed.

[0033] It should be understood that by setting up the master-slave identification module 10, the communication module 20, and the master control module 30, the master-slave identification module 10, sent by the second interface unit 23, identifies the access signal of the external module and sends it to the CAN transceiver 22. The CAN transceiver 22 processes the access signal and sends the corresponding level signal to the master control module 30 through the first interface unit 21. The master control module 30 sends control signals to the external module according to the level signal and identifies the status information of the external module. The circuit can accurately identify the status information of the newly added BMS and / or battery pack, effectively avoiding the circulating current problem. At the same time, it has the advantages of simple structure, low cost, intelligent and flexible control, and reliable communication, which improves the working safety and stability of the BMS parallel expansion system.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A BMS parallel expansion identification circuit, characterized in that, It includes a master-slave identification module, a communication module, and a master control module, wherein the master-slave identification module and the communication module are both connected to the master control module; The communication module includes a first interface unit, a CAN transceiver, and a second interface unit connected to the main control module. The CAN transceiver and the master-slave identification module are both connected to the second interface unit. The master-slave identification module is used to access external modules. The second interface unit sends the access signal of the external module identified by the master-slave identification module to the CAN transceiver. The CAN transceiver processes the access signal and sends the level signal corresponding to the access signal to the master control module through the first interface unit. The master control module sends a control signal to the external module according to the level signal and identifies the status information of the external module. The status information includes at least one of state of charge, health status, or voltage.

2. The BMS parallel expansion identification circuit according to claim 1, characterized in that, The master-slave identification module includes a master identification circuit and a slave identification circuit. Both the master identification circuit and the slave identification circuit are connected to the second interface unit. The master identification circuit is used to access the BMS unit, and the slave identification circuit is used to access the battery pack. The external module includes the BMS unit and / or the battery pack.

3. The BMS parallel expansion identification circuit according to claim 2, characterized in that, The host identification circuit includes a first terminal and a first amplification unit. The first terminal is connected to the first amplification unit. The first terminal is used to receive the input power supply VCC of the BMS unit. The first amplification unit is used to output a high-level signal corresponding to the input power supply VCC to the main control module.

4. The BMS parallel expansion identification circuit according to claim 3, characterized in that, The slave identification circuit includes a second terminal and a second amplification unit. The second terminal is connected to the second amplification unit and is used to connect to the battery pack. The second amplification unit processes the output power of the battery pack and outputs it to the CAN transceiver.

5. The BMS parallel expansion identification circuit according to claim 4, characterized in that, The first amplification unit and the second amplification unit include multiple resistors, capacitors, diodes and transistors.

6. The BMS parallel expansion identification circuit according to claim 1, characterized in that, The communication module also includes a TVS protection circuit connected to the CAN transceiver and the second interface unit, the TVS protection circuit including two bidirectional TVS diodes connected in parallel.

7. The BMS parallel expansion identification circuit according to claim 6, characterized in that, The CAN transceiver includes a chip U9 with model number SN65HVD230.

8. The BMS parallel expansion identification circuit according to claim 7, characterized in that, The communication module also includes multiple resistors and capacitors connected to the chip U9.

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