Battery simulation test platform

Abstract

The utility model discloses a battery simulation test platform which is used for testing a designed battery management system or a slave control module thereof. During testing, the upper computer sends a control command to the battery simulation test platform according to a test requirement, and the battery simulation test platform controls the output voltage value of the battery voltage simulation circuit, the output line state of the connection state control circuit, and the power supply mode and the power supply voltage of the tested module power supply control circuit according to the control command. And the current state of the battery simulation test platform is sent to the upper computer through the CAN communication circuit, and the upper computer judges by combining the state uploaded by the battery simulation test platform and information reported by the tested battery management system or the slave control module thereof through the CAN communication port thereof to obtain the function and performance states of the tested battery management system or the slave control module thereof. According to the utility model, by simulating the voltage and output state of the actual battery, the safety and efficiency of the test process are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery simulation test platform, which can provide relevant battery signal quantities required for a battery management system (BMS) or its slave control module. Background Art

[0002] Batteries are widely used in the fields of energy storage, new energy vehicles, etc. Correspondingly, a corresponding battery management system (BMS) is required for battery management. During the development and testing of BMS, a test verification platform required for simulating application scenarios will be established, and simulating battery information is one of the required signals. The traditional method of directly using battery simulation brings potential safety hazards to the development and testing process, and the method of only simulating battery voltage cannot achieve the specific condition state of the connection situation required for testing, and manual signal change is required, which brings inconvenience and difficulties to the testing work. Summary of the Invention

[0003] The main purpose of the utility model is to overcome the deficiencies of the prior art, and provide a battery simulation test platform, which can simulate battery modules under laboratory conditions, provide a test hardware and software environment for BMS or slave control modules, can quickly establish a test environment, effectively improve the test efficiency, shorten the test cycle, ensure the safety of the test process, and has strong practicability.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A battery simulation test platform includes a DCDC power supply circuit, a control circuit, a battery voltage simulation circuit, a connection state control circuit, a power supply control circuit for the module under test, a serial communication circuit, a CAN communication circuit, a dry contact port test circuit, an input port test circuit, an output port test circuit and a host computer;

[0006] One end of the DCDC power supply circuit is connected to an external DC27~36V power supply or an external DC12V power supply, and the other end is respectively connected to the control circuit, the power supply control circuit for the module under test, the serial communication circuit, the CAN communication circuit, the dry contact port test circuit and the input port test circuit;

[0007] The control circuit is respectively connected to the battery voltage simulation circuit, the connection state control circuit, the power supply control circuit for the module under test, the serial communication circuit, the CAN communication circuit, the dry contact port test circuit, the input port test circuit and the output port test circuit;

[0008] One end of the battery voltage simulation circuit is connected to an external DC12V power supply, and the other end is connected to the connection state control circuit;

[0009] The connection status control circuit is connected to the battery voltage acquisition port of the battery management system under test or its slave control module;

[0010] The power control circuit of the module under test is respectively connected to an external programmable power supply and the power port of the battery management system under test or its slave control module;

[0011] The serial communication circuit is connected to the external programmable power supply for serial communication;

[0012] The CAN communication circuit is respectively connected to the host computer and the CAN communication port of the battery management system under test or its slave control module for CAN communication;

[0013] The dry contact port test circuit is connected to the dry contact port of the battery management system under test or its slave control module;

[0014] The input port test circuit is connected to the input test port of the battery management system under test or its slave control module;

[0015] The output port test circuit is connected to the output test port of the battery management system under test or its slave control module.

[0016] Preferably, the DCDC power circuit steps down an external DC27~36V power supply or an external DC12V power supply to 5V to supply power to the control circuit, the power control circuit of the module under test, the serial communication circuit, the CAN communication circuit, the dry contact port test circuit, and the input port test circuit;

[0017] The DCDC power circuit steps down an external DC27~36V power supply to an on-board DC24V power supply, which supplies power to the battery management system under test or its slave control module through the power control circuit of the module under test.

[0018] Preferably, the control circuit includes an MCU, an external clock circuit, a reference voltage circuit, a working state indication circuit, and a power-on reset circuit;

[0019] The external clock circuit, the reference voltage circuit, the working state indication circuit, and the power-on reset circuit are respectively connected to the MCU.

[0020] Preferably, the battery voltage simulation circuit includes a voltage isolation module and multiple single-cell battery simulation circuits; the single-cell battery simulation circuit is composed of an adjustable linear voltage regulator and an optocoupler containing MOS transistors;

[0021] The voltage isolation module is connected to the adjustable linear voltage regulator in the single-cell battery simulation circuit;

[0022] The adjustable linear voltage regulator is connected to the control circuit through an optocoupler containing MOS transistors;

[0023] The control circuit controls the output voltage of the adjustable linear voltage regulator by controlling the state of the control optocoupler including MOS transistors.

[0024] The output voltage includes three states, including an undervoltage state of 2.0V ± 0.1V, a normal state of 3.3V ± 0.1V, and an overvoltage state of 3.75V ± 0.1V.

[0025] Preferably, the connection state control circuit uses a 4-pin solid-state relay.

[0026] Preferably, the power supply control circuit of the module under test uses a double-pole double-throw relay.

[0027] Preferably, the serial communication circuit is composed of a dual-channel Schmitt trigger buffer and its peripheral circuits;

[0028] The CAN communication circuit is composed of a CAN bus transceiver chip and its peripheral circuits.

[0029] Preferably, the dry contact port test circuit includes an excitation signal source and a dry contact state detection module;

[0030] The excitation signal source is used to provide an excitation signal source for the dry contact port of the battery management system under test or its slave control module;

[0031] The dry contact state detection module is used to detect the dry contact state returned by the dry contact port of the battery management system under test or its slave control module.

[0032] Preferably, the input port test circuit uses an isolated gate driver.

[0033] Preferably, the output port test circuit is composed of a resistor R28, a resistor R30, a capacitor C23, and a TVS diode D9; one side of the resistor R30, the capacitor C23, and the TVS diode D9 in parallel is connected in series with one end of the resistor R28, and the other side is connected to the control circuit;

[0034] The other end of the resistor R28 is connected to the output test port of the battery management system under test or its slave control module.

[0035] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0036] 1. It can simulate a hierarchically configurable battery voltage. By configuring different analog output voltages, it can simulate the generation of normal, undervoltage, and overvoltage states, avoiding the need for repeated charging and discharging in the battery usage method during testing and the manual repeated adjustment in the fixed analog method, and improving the testing efficiency.

[0037] 2. The power supply simulates the voltage and output status of the actual battery, ensuring the safety of the test process.

[0038] 3. The output lines of each string simulating the single-cell battery can be controlled to be connected or disconnected through switches, which can simulate the disconnection state of the sampling line in reality, test the disconnection detection and processing function of the system or module under test, and improve the integrity and coverage of the test.

[0039] 4. It can be combined with the host computer software to achieve automated testing and improve the test efficiency. Description of the Drawings

[0040] Figure 1 It is a schematic structural diagram of a battery simulation test platform of the present utility model.

[0041] Figure 2 It is an application scenario diagram of a battery simulation test platform of the present utility model.

[0042] Figure 3 It is a topological diagram of the battery voltage simulation circuit in the present utility model.

[0043] Figure 4 It is a topological diagram of the connection state control circuit in the present utility model.

[0044] Figure 5 It is a topological diagram of the power supply control circuit of the module under test in the present utility model.

[0045] Figure 6 It is a topological diagram of the serial communication circuit in the present utility model.

[0046] Figure 7 It is a topological diagram of the CAN communication circuit in the present utility model.

[0047] Figure 8 It is a topological diagram of the dry contact port test circuit in the present utility model.

[0048] Figure 9 It is a topological diagram of the input port test circuit in the present utility model.

[0049] Figure 10 It is a topological diagram of the output port test circuit in the present utility model.

[0050] Description of the reference numerals in the drawings: 1. DCDC power supply circuit; 2. Control circuit; 3. Battery voltage simulation circuit; 4. Connection state control circuit; 5. Power supply control circuit of the module under test; 6. Serial communication circuit; 7. CAN communication circuit; 8. Dry contact port test circuit; 9. Input port test circuit; 10. Output port test circuit; 11. Host computer; 12. External DC27~36V power supply; 13. External DC12V power supply. Detailed Implementation Manner

[0051] The present utility model will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the implementation manners of the present utility model are not limited thereto. Embodiment

[0052] As Figure 1 、 2 shown, this embodiment provides a battery simulation test platform, including a DCDC power circuit (1), a control circuit (2), a battery voltage simulation circuit (3), a connection state control circuit (4), a power supply control circuit for the module under test (5), a serial communication circuit (6), a CAN communication circuit (7), a dry contact port test circuit (8), an input port test circuit (9), an output port test circuit (10) and a host computer (11);

[0053] One end of the DCDC power circuit (1) is connected to an external DC27~36V power supply (12) or an external DC12V power supply (13), and the other end is respectively connected to the control circuit (2), the power supply control circuit for the module under test (5), the serial communication circuit (6), the CAN communication circuit (7), the dry contact port test circuit (8) and the input port test circuit (9); the DCDC power circuit has functions such as input overcurrent protection, transient pulse protection, input reverse connection prevention and power supply state indication, and supplies power to the connected circuits.

[0054] The control circuit (2) is respectively connected to the battery voltage simulation circuit (3), the connection state control circuit (4), the power supply control circuit for the module under test (5), the serial communication circuit (6), the CAN communication circuit (7), the dry contact port test circuit (8), the input port test circuit (9) and the output port test circuit (10); the control circuit controls the connected circuits according to the commands of the host computer.

[0055] One end of the battery voltage simulation circuit (3) is connected to an external DC12V power supply (13), and the other end is connected to the connection state control circuit (4); the battery voltage simulation circuit outputs different voltage values according to the control of the control circuit to simulate different states of the battery.

[0056] The connection state control circuit (4) is connected to the battery voltage acquisition port of the battery management system under test or its slave control module; it outputs the connection and disconnection of the line according to the control of the control circuit to simulate the connection state of the acquisition line of the battery management system under test or its slave control module.

[0057] The power control circuit (5) of the module under test is respectively connected to an external programmable power supply and the power supply ports of the battery management system under test or its slave control module; according to the control of the control circuit, it selects different power supply methods to supply power to the battery management system under test or its slave control module, that is, it selects an external DC27~36V power supply or an external programmable power supply for power supply.

[0058] The serial communication circuit (6) is connected to the external programmable power supply for serial communication. When the external programmable power supply is used to supply power to the battery management system under test or its slave control module, the output voltage value of the external programmable power supply is adjusted accordingly.

[0059] The CAN communication circuit (7) is respectively connected to the CAN communication ports of the upper computer (11) and the battery management system under test or its slave control module for CAN communication; it realizes the CAN communication between the control circuit, the upper computer and the battery management system under test or its slave control module. The upper computer (11) can send control commands to the control circuit through the CAN communication circuit, and can also receive the status and information of this platform and the battery management system under test or its slave control module through it.

[0060] The dry contact port test circuit (8) is connected to the dry contact port of the battery management system under test or its slave control module; it provides an excitation signal source for the dry contact of the battery management system under test or its slave control module and detects the dry contact status.

[0061] The input port test circuit (9) is connected to the input test port of the battery management system under test or its slave control module; the output port test circuit (10) is connected to the output test port of the battery management system under test or its slave control module through an output test interface, which is used to detect whether the input / output function of the battery management system under test or its slave control module is normal.

[0062] When testing the battery management system under test or its slave control module, the battery simulation test platform is powered on and in the standby state; the upper computer sends control commands to the battery simulation test platform according to the test requirements. The battery simulation test platform controls the output voltage value of the battery voltage simulation circuit, the output line state of the connection state control circuit, the power supply mode and power supply voltage of the power control circuit of the module under test, and sends the current state of the battery simulation test platform to the upper computer through the CAN communication circuit. The upper computer makes a judgment by combining the state uploaded by the battery simulation test platform and the information reported by the battery management system under test or its slave control module through its CAN communication port, and obtains the function and performance status of the battery management system under test or its slave control module.

[0063] In a specific embodiment, the DCDC power circuit (1) steps down an external DC 27 - 36V power supply (12) or an external DC 12V power supply (13) to 5V to supply power to the control circuit, the power control circuit of the module under test, the serial communication circuit, the CAN communication circuit, the dry contact port test circuit, and the input port test circuit; when the power supply mode of the battery management system under test or its slave module is external power supply, the DCDC power circuit (1) steps down the external DC 27 - 36V power supply (12) to convert it into an on - board DC 24V power supply, which supplies power to the battery management system under test or its slave module through the power control circuit of the module under test (5).

[0064] In a specific embodiment, the control circuit (2) includes an MCU (201), an external clock circuit (202), a reference voltage circuit (203), a working state indication circuit (204), and a power - on reset circuit (205); the external clock circuit (202), the reference voltage circuit (203), the working state indication circuit (204), and the power - on reset circuit (205) are all connected to the MCU (201). In this embodiment, the MCU (201) uses an MKE06Z128VLH4 micro - control chip; the external clock circuit (202) is used to provide clock information for the MCU; the reference voltage circuit (203) serves as a reference source for analog signal acquisition; the working state indication circuit (204) is used to indicate the working state of the MCU; the power - on reset circuit (205) is used to perform power - on detection and reset operations on the MCU to avoid damage.

[0065] In a specific embodiment, the battery voltage simulation circuit (3) includes a voltage isolation module and multiple single - cell battery simulation circuits; each single - cell battery simulation circuit is composed of an adjustable linear voltage regulator and an opto - coupler containing MOS transistors; the voltage isolation module is connected to the adjustable linear voltage regulator; the adjustable linear voltage regulator is connected to the control circuit through an opto - coupler containing MOS transistors; the control circuit controls the output voltage of the adjustable linear voltage regulator by controlling the state of the opto - coupler containing MOS transistors; the output voltage has three states, namely: an under - voltage state of 2.0V ± 0.1V, a normal state of 3.3V ± 0.1V, and an over - voltage state of 3.75V ± 0.1V.

[0066] Figure 3 The battery voltage simulation circuit including 2 single - cell battery simulation circuits is shown. The external DC 12V power supply is isolated by the chip UA30 in the voltage isolation module to generate two independent and isolated 9V DC power supplies, and then the adjustable linear voltage regulators UA27 and UA33 are used for secondary linear step - down to generate a stable DC power supply with low ripple. Figure 3Among them, RA122 and RA128, RA134 and RA140 control the default output voltage of each path. By controlling the control commands of the control circuit, the states of optocouplers UA80 and UA86, UA79 and UA85 are adjusted, so as to control the conduction states of MOS transistors QA4 and QA6, QA1 and QA3 respectively, in order to achieve the purpose of controlling the feedback voltage of adjustable linear regulators U27 and U33, and finally control the output voltage of adjustable linear regulators U27 and U33, realizing the purpose of simulating different battery voltage values in a digital control manner.

[0067] In a specific embodiment, as Figure 4 shown, the connection state control circuit (4) uses a 4-pin solid-state relay UA48; among them, the 4th pin is connected to the output voltage of the battery voltage simulation circuit (3), the 3rd pin is connected to the battery voltage acquisition port of the battery management system to be measured or its slave control module, the 2nd pin is connected to the control circuit through a resistor RA131, and the 1st pin is connected to the DCDC power supply circuit. The control circuit realizes the acquisition simulation of the connection and disconnection states of the battery voltage acquisition port to the battery sampling line by controlling the conduction or non-conduction of the solid-state relay UA48.

[0068] In a specific embodiment, as Figure 5 shown, the power supply control circuit (5) of the module to be measured uses a double-pole double-throw relay JDQ1 to control the power supply mode of the battery management system to be measured or its slave control module; it has two power supply inputs at the input end, one is a fixed DC24V power supply generated by the DCDC power supply circuit, and the other is an adjustable DC power supply output from an external programmable power supply ( Figure 5 the LAdjPwr interface in is connected to the external programmable power supply); the common end of the double-pole double-throw relay JDQ1 is the output end ( Figure 5 the LpwrOut interface in), which is connected to the power supply port of the battery management system to be measured or its slave control module. The control circuit controls the working state of the double-pole double-throw relay JDQ1 by controlling the conduction state of the triode Q1, so as to select different power supplies to supply power to the battery management system or module to be measured. Figure 5 The external programmable power supply is not shown in. In the double-pole double-throw relay JDQ1, the other interface except the LAdjPwr interface is connected to the DCDC power supply circuit part.

[0069] In a specific embodiment, the serial communication circuit (6) is composed of a dual-channel Schmitt trigger buffer and its peripheral circuits. As Figure 6As shown, in this embodiment, the model 74LVC2G17 chip is used as the serial communication circuit. Among them, the 4th pin MRxd of chip U4B and the 1st pin MTxd of chip U4A are connected to the control circuit, and the 3rd pin Rxd and the 6th pin Txd are connected to the external programmable power supply through resistors R16 and R17 (chips U4B and U4A are of the same type because the 74LVC2G17 chip includes a dual-channel Schmitt trigger buffer and is divided for easy distinction); when the external programmable power supply supplies power to the battery management system under test or its slave control module, the serial communication circuit controls the external programmable power supply to supply power to the battery management system under test or its slave control module at different voltages to test the operating voltage characteristics of the battery management system under test or its slave control module.

[0070] The CAN communication circuit (7) is composed of a CAN bus transceiver chip and its peripheral circuits. As Figure 7 shown, in this embodiment, the model TJA1050T / CM,118 chip is used as the CAN communication circuit U2, where the 1st pin and the 4th pin are connected to the control circuit, and the 7th pin and the 8th pin are connected to the host computer to receive communication control commands from the host computer and feedback information such as the status of this platform.

[0071] In a specific embodiment, the dry contact port test circuit (8) includes an excitation signal source and a dry contact state detection module; among them, the excitation signal source is used to provide an excitation signal source for the dry contact port of the battery management system under test or its slave control module; the dry contact state detection module is used to detect the dry contact state returned by the dry contact port of the battery management system under test or its slave control module.

[0072] In this embodiment, as Figure 8 shown, the excitation signal source is composed of a signal transmitter F1 and a resistor R20, and the dry contact state detection module is composed of a resistor R10, a resistor R13, a capacitor C25, and a TVS diode D24; the dry contact test output terminal (RLTStOut) and the dry contact test input terminal (RLTStIn) in the dry contact port test circuit (8) are connected to the dry contact port of the battery management system under test or its slave control module. This platform uses an external 12V power supply to provide an excitation signal source for the output dry contact of the battery management system under test or its slave control module at the dry contact test output terminal (RLTStOut) through the signal transmitter F1 and the resistor R20. After passing through the dry contact of the battery management system under test or its slave control module, it returns to the dry contact test input terminal (RLTStIn), and the control circuit detects the returned state processed by the dry contact state detection module to achieve the purpose of detecting the dry contact state.

[0073] In a specific embodiment, the input port test circuit (9) uses an isolated gate driver. As Figure 9As shown in the figure, in this embodiment, the chip U6 with the model IX4427NTR is used as the input port test circuit. Among them, MDiTstOut1 and MDiTstOut2 of the chip U6 are connected to the control circuit, and DiTstOut1 and DiTstOut2 are connected to the input test ports of the battery management system under test or its slave control module. The control circuit controls the outputs of the 7th pin and the 5th pin of the chip U6 through the resistors R23 and R25, so as to control the output high or low level states of DiTstOut1 and DiTstOut2 for the battery management system under test or its slave control module to perform input detection. During detection, this platform sends the control status to the host computer through the CAN communication circuit, and the battery management system under test or its slave control module also synchronously sends the detected input status to the host computer through the CAN communication port. The host computer combines the statuses of both to determine whether the input detection function of the battery management system under test or its slave control module is normal.

[0074] In a specific embodiment, as Figure 10 shown, the output port test circuit (10) is composed of a resistor R28, a resistor R30, a capacitor C23, and a TVS diode D9; among them, one side of the resistor R30, the capacitor C23, and the TVS diode D9 in parallel is connected in series with one end of the resistor R28, and the other side is connected to the control circuit; the other end of the resistor R28 is connected to the output test port of the battery management system under test or its slave control module; DoTstIn in the output port test circuit (10) is connected to the output test port of the battery management system under test or its slave control module, and MDoTstIn is connected to the control circuit. The control circuit detects the status of MDoTstIn and sends it to the host computer through the CAN communication circuit, and the battery management system under test or its slave control module also sends the output status to the host computer through the CAN communication port. The host computer combines the statuses of both to determine whether the output function of the battery management system under test or its slave control module is normal.

[0075] It should also be noted that in this specification, terms such as "including", "comprising", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article, or device including the said element.

[0076] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery simulation test platform, characterized in that: It includes DCDC power supply circuit, control circuit, battery voltage simulation circuit, connection status control circuit, power supply control circuit of the module under test, serial communication circuit, CAN communication circuit, dry contact port test circuit, input port test circuit, output port test circuit and host computer; One end of the DCDC power supply circuit is connected to an external DC27~36V power supply or an external DC12V power supply, and the other end is respectively connected to a control circuit, a power control circuit of a module under test, a serial communication circuit, a CAN communication circuit, a dry contact port test circuit and an input port test circuit; The control circuit is respectively connected to the battery voltage simulation circuit, the connection state control circuit, the tested module power control circuit, the serial communication circuit, the CAN communication circuit, the dry contact port test circuit, the input port test circuit and the output port test circuit; One end of the battery voltage simulation circuit is connected to an external DC12V power supply, and the other end is connected to a connection state control circuit; The connection state control circuit is connected to the battery voltage acquisition port of the battery management system under test or its slave control module; The power control circuit of the module under test is respectively connected to the external programmable power supply and the power port of the battery management system under test or its slave control module; The serial communication circuit is connected to an external programmable power supply for serial communication; The CAN communication circuit is respectively connected to the CAN communication ports of the host computer and the battery management system under test or its slave control module for CAN communication; The dry contact port test circuit is connected to the dry contact port of the battery management system under test or its slave control module; The input port test circuit is connected to the input test port of the battery management system under test or its slave control module; The output port test circuit is connected to the output test port of the battery management system under test or its slave control module.

2. A battery simulation test platform according to claim 1, characterized in that: The DCDC power supply circuit converts the external DC27~36V power supply or the external DC12V power supply into 5V to supply power to the control circuit, the power control circuit of the module under test, the serial communication circuit, the CAN communication circuit, the dry contact port test circuit and the input port test circuit; The DCDC power supply circuit steps down the external DC27~36V power supply and converts it into an onboard DC24V power supply, which supplies power to the battery management system under test or its slave control module through the power control circuit of the module under test.

3. A battery simulation test platform according to claim 1, characterized in that: The control circuit includes an MCU, an external clock circuit, a reference voltage circuit, a working state indication circuit and a power-on reset circuit; The external clock circuit, reference voltage circuit, working state indication circuit and power-on reset circuit are respectively connected to the MCU.

4. A battery simulation test platform according to claim 1, characterized in that: The battery voltage simulation circuit includes a voltage isolation module and a plurality of single-cell battery simulation circuits; the single-cell battery simulation circuit includes an adjustable linear regulator and a photoelectric coupler including a MOS tube; The voltage isolation module is connected to an adjustable linear regulator in a single cell simulation circuit; The adjustable linear regulator is connected to the control circuit via a photoelectric coupler including a MOS tube; The control circuit controls the output voltage of the adjustable linear regulator by controlling the state of the photoelectric coupler including the MOS tube; The output voltage includes three states, including an undervoltage state of 2.0V±0.1V, a normal state of 3.3V±0.1V, and an overvoltage state of 3.75V±0.1V.

5. A battery simulation test platform according to claim 1, characterized in that: The connection state control circuit adopts a 4-pin solid-state relay.

6. A battery simulation test platform according to claim 1, characterized in that: The power supply control circuit of the module under test adopts a double-pole double-throw relay.

7. A battery simulation test platform according to claim 1, characterized in that: The serial communication circuit is composed of a dual-channel Schmitt trigger buffer and its peripheral circuits; The CAN communication circuit is composed of a CAN bus transceiver chip and its peripheral circuits.

8. A battery simulation test platform according to claim 1, characterized in that: The dry contact port test circuit includes an excitation signal source and a dry contact state detection module; The excitation signal source is used to provide an excitation signal source for the dry contact port of the battery management system under test or its slave control module; The dry contact state detection module is used to detect the dry contact state returned by the dry contact port of the battery management system under test or its slave control module.

9. A battery simulation test platform according to claim 1, characterized in that: The input port test circuit adopts an isolated gate driver.

10. A battery simulation test platform according to claim 1, characterized in that: The output port test circuit is composed of a resistor R28, a resistor R30, a capacitor C23 and a TVS diode D9; one side of the resistor R30, the capacitor C23 and the TVS diode D9 is connected in parallel and connected in series with one end of the resistor R28, and the other side is connected to the control circuit; The other end of the resistor R28 is connected to the output test port of the battery management system under test or its slave control module.

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