High-voltage load simulation device and in-loop test equipment based on power battery management system testing

Abstract

The utility model discloses a high-voltage load simulation device and an in-the-loop test equipment based on the test of a power battery management system, wherein the device comprises a contactor fault simulation module, the contactor fault simulation module has a test contactor and a fault simulation module, and the contactor fault simulation module is used to simulate the fault of the corresponding test contactor; the high-voltage load simulation device is connected to a battery pack and a charging pile power supply through a high-voltage input connector; the utility model can effectively meet the test of a battery management system below 1000V, and support the test of a battery management system including battery pack heating and DC charging functions; it can simulate high-voltage pre-charging processes with different parameters, and can perform high-voltage power on and off control, and can simulate all high-voltage contactor contact faults; as a component device of a hardware in-the-loop test device, it realizes the simulation of the high-voltage pre-charging process of a new energy electric vehicle, and the simulation of short circuits and open circuit faults at multiple points in the high-voltage circuit, so as to meet the BMS test work in a complex environment.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle testing, and in particular to a high-voltage load simulation device and an in-loop testing device based on a power battery management system test. Background Art

[0002] For new energy vehicles, the battery management system (BMS) test is an important indicator of vehicle quality. The high-voltage load simulation device is an indispensable component of the battery management system hardware-in-the-loop test equipment (HIL). The high-voltage load simulation device can quickly and effectively simulate the total voltage of the battery pack, simulate the high-voltage pre-charging process of new energy electric vehicles, and simulate the short circuit and open circuit faults of multiple points in the high-voltage circuit to meet the BMS test work in complex environments. The existing high-voltage load simulation device is not highly integrated and is generally only equipped with a high-voltage pre-charging simulation circuit, no-load DC fast charging simulation, and battery pack heating simulation. Therefore, it cannot meet the battery management system test with DC fast charging function and battery pack heating function.

[0003] With the development of new energy power battery pack technology, power battery packs exceeding 600V are gradually put into use. Existing high-voltage load simulation devices support battery management system tests below 600V, but cannot meet the testing requirements of battery management systems above 600V. The above problems need to be solved urgently. Utility Model Content

[0004] The purpose of the utility model is to provide a high-voltage load simulation device and an in-loop test equipment based on a power battery management system test, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-voltage load simulation device based on power battery management system testing, including a contactor fault simulation module, the contactor fault simulation module has a test contactor and a fault simulation module, and the contactor fault simulation module is used to simulate the fault of the corresponding test contactor; the contactor fault simulation module includes a main positive contactor simulation module, a pre-charge contactor simulation module, a heating contactor simulation module, a discharge simulation module, a main negative contactor simulation module, a DC fast charge positive contactor simulation module and a DC fast charge negative contactor simulation module;

[0006] A first parallel circuit, wherein the first parallel circuit comprises a main positive contactor simulation module and a pre-charge contactor simulation module, and the main positive contactor simulation module and the pre-charge contactor simulation module are connected in parallel;

[0007] A second parallel circuit, wherein the second parallel circuit comprises a heating contactor simulation module and a discharge circuit, and the heating contactor simulation module and the discharge circuit are connected in parallel;

[0008] The first parallel circuit input end is connected to the output end of the DC fast charging positive contactor simulation module, the first parallel circuit output end is connected to the second parallel circuit input end, the second parallel circuit output end is connected to the main negative contactor simulation module input end, and the main negative contactor simulation module output end is connected to the DC fast charging negative contactor simulation module input end; the first parallel circuit input end is connected to the positive pole of the output voltage of the battery pack through a high-voltage input connector, the DC fast charging positive contactor simulation module input end is connected to the positive pole of the charging pile power supply through a high-voltage input connector, the main negative contactor simulation module output end is connected to the negative pole of the output voltage of the battery pack through a high-voltage input connector, and the DC fast charging negative contactor simulation module output end is connected to the negative pole of the charging pile power supply through a high-voltage input connector.

[0009] Furthermore, the first parallel circuit also includes a pre-charging resistor module. The pre-charging contactor simulation module is connected in series with the pre-charging resistor module and then connected in parallel with the main positive contactor simulation module. The resistance value of the pre-charging resistor module is changed to adapt to the testing of different battery management systems.

[0010] Furthermore, a first end and a second end of the coil of the test contactor are connected to a contactor signal input connector, the first end is connected to an external input high-side drive signal through the contactor signal input connector, and the second end is connected to an external input low-side drive signal through the contactor signal input connector;

[0011] The fault simulation module includes:

[0012] Adhesion simulation module, the adhesion simulation module is connected in parallel with the test contactor;

[0013] A loss of control simulation module, the loss of control simulation module is connected in series between the first end and the contactor signal input connector;

[0014] The simulation module cannot be attracted. The adhesion simulation module is connected in parallel with the contactor and then connected in series with the simulation module that cannot be attracted.

[0015] Furthermore, it also includes a fault signal input connector, the fault simulation module is connected to the fault signal input connector, and the fault signal input connector is used to receive the external input fault signal.

[0016] Furthermore, the fault simulation module also includes a status indicator light. When the fault simulation module receives a fault signal, the status indicator light is turned on.

[0017] Furthermore, it also includes a high-voltage output connector, a high-voltage sampling point is set, and the high-voltage sampling point is connected to the high-voltage output connector.

[0018] Furthermore, it also includes a box body, the front panel of the box body is provided with a strip hole, the status indicator light is arranged on the front panel, the rear panel of the box body is arranged with a fan, and the high-voltage output connector, high-voltage input connector, fault signal input connector and contactor signal input connector are arranged on the rear panel.

[0019] Furthermore, a first fuse simulation module is connected in series between the high-voltage input connector port of the positive pole of the battery pack output voltage and the input end of the first parallel circuit, and a second fuse simulation module is connected in series between the high-voltage input connector port of the negative pole of the battery pack output voltage and the output end of the main negative contactor simulation module.

[0020] Furthermore, the discharge circuit includes a discharge capacitor, a discharge circuit start-up module and a discharge resistor. The discharge circuit start-up module and the discharge resistor are connected in series and then in parallel with the discharge capacitor.

[0021] On the other hand, an in-the-loop test device is provided, comprising any of the above-mentioned high-voltage load simulation devices for testing a power battery management system.

[0022] Compared with the prior art, the beneficial effects of the utility model are as follows: the high-voltage load simulation device of the utility model can effectively meet the test of battery management systems below 1000V, and solve the problem that the existing high-voltage load simulation device cannot support the test of battery management systems above 600V; the utility model supports the test of battery management systems including battery pack heating and DC charging functions; the utility model can simulate high-voltage pre-charging processes with different parameters, and can perform high-voltage power on and off control, and can simulate all high-voltage contactor contact normally open, normally closed faults and high-voltage contactor coil open circuit, short circuit to power supply and short circuit to ground and other faults; the internal layout of the utility model plans a heat dissipation channel, and is equipped with a heat dissipation fan to quickly transfer the heat dissipated by high-power heating devices to the utility model The outside of the device ensures the stable operation of the high-voltage load simulation device of the utility model; the interactive cable between the high-voltage load simulation device of the utility model and the external equipment has been led to the female aviation plug on the rear panel of the device, and the connection between the device and the external equipment can be quickly established through the aviation plug; the high-voltage load simulation device of the utility model is installed with 24 status indicator lights on the front panel, and the internal working status of the high-voltage load simulation device can be intuitively understood; the box of the utility model is conveniently installed in the battery management system hardware-in-the-loop test equipment (HIL) cabinet, as a component of the hardware-in-the-loop test equipment, to realize the high-voltage pre-charging process simulation of new energy electric vehicles, and the short circuit and open circuit faults of multiple points in the high-voltage circuit, so as to meet the BMS test work in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic block diagram of the connection relationship of the contactor fault simulation module in the embodiment of the utility model;

[0024] Figure 2 A circuit diagram of a high-voltage load simulation device for testing a power battery management system in an embodiment of the utility model;

[0025] Figure 3 This is a circuit diagram of a main positive contactor simulation module in an embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of a box of a high-voltage load simulation device in an embodiment of the utility model;

[0027] Figure 5 A schematic diagram of the connection between the status indicator light and the fault signal input terminal arranged on the front panel in the embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of a box of another high-voltage load simulation device in an embodiment of the utility model;

[0029] Figure 7 This is a schematic diagram of a high voltage input connector in an embodiment of the utility model;

[0030] Figure 8 This is a schematic diagram of a high voltage output connector in an embodiment of the utility model;

[0031] Fig. 9 This is a schematic diagram of a relay input connector in an embodiment of the utility model;

[0032] Fig.10 This is a schematic diagram of an ECU input connector in an embodiment of the utility model;

[0033] In the figure: 10, DC fast charging positive contactor simulation module; 20, main positive contactor simulation module; 30, pre-charging contactor simulation module; 40, heating contactor simulation module; 50, discharge circuit; 60, main negative contactor simulation module; 70, DC fast charging negative contactor simulation module; 80, pre-charging resistor module. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Please refer to the attached drawings of the specification, the utility model provides a technical solution: Figure 1 As shown, a high-voltage load simulation device based on power battery management system testing includes a contactor fault simulation module, the contactor fault simulation module has a test contactor and a fault simulation module, and the contactor fault simulation module is used to simulate the fault of the corresponding test contactor; the contactor fault simulation module includes a main positive contactor simulation module 20, a pre-charge contactor simulation module 30, a heating contactor simulation module 40, a main negative contactor simulation module 60, a DC fast charge positive contactor simulation module 10 and a DC fast charge negative contactor simulation module 70;

[0038] A first parallel circuit, wherein the first parallel circuit comprises a main positive contactor simulation module 20 and a pre-charge contactor simulation module 30, and the main positive contactor simulation module 20 and the pre-charge contactor simulation module 30 are connected in parallel;

[0039] A second parallel circuit, wherein the second parallel circuit comprises a heating contactor simulation module 40 and a discharge circuit 50, and the heating contactor simulation module 40 and the discharge circuit 50 are connected in parallel;

[0040] The first parallel circuit input end is connected to the output end of the DC fast charging positive contactor simulation module 10, the first parallel circuit output end is connected to the second parallel circuit input end, the second parallel circuit output end is connected to the input end of the main negative contactor simulation module 60, and the output end of the main negative contactor simulation module 60 is connected to the input end of the DC fast charging negative contactor simulation module 70; the first parallel circuit input end is connected to the positive pole of the output voltage of the battery pack through a high-voltage input connector, the DC fast charging positive contactor simulation module 10 input end is connected to the positive pole of the charging pile power supply through a high-voltage input connector, the main negative contactor simulation module 60 output end is connected to the negative pole of the output voltage of the battery pack through a high-voltage input connector, and the DC fast charging negative contactor simulation module 70 output end is connected to the negative pole of the charging pile power supply through a high-voltage input connector.

[0041] In the above embodiment, Figure 1 and 7 As shown, Vbat+ and Vbat- are connected to the output voltage of the new energy vehicle power battery pack. In the hardware-in-the-loop test equipment, the output voltage of the vehicle power battery pack can be replaced by a high-voltage programmable power supply, and the power battery pack output voltage or the high-voltage programmable power supply output voltage can be connected through the 1st and 2nd channels of the high-voltage input connector; Vdc+ and Vdc- are connected to the output voltage of the new energy vehicle DC charging pile. In the hardware-in-the-loop test equipment, the output voltage of the vehicle power battery pack can be replaced by a high-voltage programmable power supply, and the DC charging pile output voltage or the high-voltage programmable power supply output voltage can be connected through the 3rd and 4th channels of the high-voltage input connector.

[0042] Alternatively, if Figure 2 As shown, the first parallel circuit also includes a pre-charging resistor module 80. The pre-charging contactor simulation module 30 is connected in series with the pre-charging resistor module 80 and then connected in parallel with the main positive contactor simulation module 20. The resistance value of the pre-charging resistor module 80 is changed to adapt to the testing of different battery management systems.

[0043] In the above embodiment, Figure 2 The Swich11, Swich12, and Swich13 relays are used to select pre-charging resistors of different resistance values ​​to better adapt to the tests of different battery management systems and ensure the versatility of the high-voltage load simulation device.

[0044] Optionally, the first end and the second end of the coil of the test contactor are connected to the contactor signal input connector, the first end is connected to the external input high-side drive signal through the contactor signal input connector, and the second end is connected to the external input low-side drive signal through the contactor signal input connector;

[0045] The fault simulation module includes:

[0046] Adhesion simulation module, the adhesion simulation module is connected in parallel with the test contactor;

[0047] A loss of control simulation module, the loss of control simulation module is connected in series between the first end and the contactor signal input connector;

[0048] The simulation module cannot be attracted. The adhesion simulation module is connected in parallel with the contactor and then connected in series with the simulation module that cannot be attracted.

[0049] In the above embodiment, if Fig.10 As shown, the contactor signal input connector in the utility model is an ECU input connector, such as Figure 2 As shown, Pos_Relay, Neg_Relay, Pre_Relay, PTC_Relay, DCpos_Relay, and DCneg_Relay respectively represent the main positive contactor, main negative contactor, pre-charging contactor, heating contactor, DC fast charging positive contactor, and DC fast charging negative contactor on the new energy vehicle. In the utility model, high-voltage DC contactors with higher technical parameters are uniformly used as substitutes, with a withstand voltage level of 1000V, making the utility model more universal. The utility model adopts TE EV200AAANA high-voltage DC contactor.

[0050] Pos_HighSide and Pos_LowSide represent the high and low side drive signals of the main positive contactor respectively, Neg_HighSide and Neg_LowSide represent the high and low side drive signals of the main negative contactor respectively, Pre_HighSide and Pre_LowSide represent the high and low side drive signals of the pre-charging contactor respectively, PTC_HighSide and PTC_LowSide represent the high and low side drive signals of the heating contactor respectively, DCpos_HighSide and DCpos_LowSide represent the high and low side drive signals of the DC fast charging positive contactor respectively, DCneg_HighSide and DCneg_LowSide represent the high and low side drive signals of the DC fast charging negative contactor respectively, and the above drive signals establish a connection with the BMS controller through the ECU input connector.

[0051] For example, Figure 3As shown, the fault simulation module is the main positive contactor simulation module 20, the adhesion simulation module is Swich2, the out-of-control simulation module is Swich3, the unable to attract simulation module is Swich4, and the test contactor is the main positive contactor (Pos_Relay). When the Swich2, Swich3, and Swich4 relays are all disconnected, it indicates that the main positive contactor (Pos_Relay) is in normal working condition. When the Swich2 relay is attracted alone, the main positive contactor adhesion fault is simulated. When the Swich3 relay is attracted alone, the main positive contactor control failure fault is simulated. When the Swich4 relay is attracted alone, the main positive contactor contact failure to attract fault is simulated.

[0052] Optionally, it also includes a fault signal input connector, the fault simulation module is connected to the fault signal input connector, and the fault signal input connector is used to receive an external input fault signal.

[0053] In the above embodiment, the fault signal input connector of the utility model is Fig. 9 Relay connectors in Figure 2 As shown, there are 24 relays from Swich1 to Swich24, whose main function is to simulate the fault status of the main positive contactor, the main negative contactor, the pre-charging contactor, the heating contactor, the DC fast charging positive contactor, and the DC fast charging negative contactor, such as the normally open and normally closed faults of the contactor contacts and the open circuit of the high-voltage contactor coil, the short circuit to the power supply, and the short circuit to the ground. The 24 relays are controlled by 24 corresponding digital signals from DO1 to DO24. When the digital signal is at a high level, the relay is energized, otherwise the relay is disconnected, and the relay control signal (DO1 to DO24) is introduced from the external device through the relay input connector. The main positive contactor fault circuit is taken as an example for specific introduction, and the other contactor fault circuits are the same as the main positive contactor fault circuit.

[0054] Optionally, the fault simulation module further includes a status indicator light, and when the fault simulation module receives a fault signal, the status indicator light turns on.

[0055] In the above embodiment, if Figure 2 and 5 As shown, the energized states of 24 relays, Swich1 to Swich24, respectively represent the working states of the high-voltage load simulation device, and the energized states of the 24 relays are controlled by 24 digital signals, DO1 to DO24. Therefore, 24 status indicator lights are designed in the circuit to intuitively reflect the specific working states of the high-voltage load simulation device.

[0056] Optionally, a high-voltage output connector is also included, a high-voltage sampling point is set, and the high-voltage sampling point is connected to the high-voltage output connector.

[0057] In the above embodiment, if Figure 2 As shown, V1, V2, V3, V4, V5, and V6 are a total of 6 voltage output signals. They are 6 high-voltage sampling points required for the test of the new energy vehicle power battery management system, which are used for high-voltage power-on and power-off functional logic tests. The above 6 high-voltage sampling points are connected to the high-voltage output connector. External devices can establish a connection relationship through the connector. The corresponding relationship between the signal and the channel is as follows Figure 8 shown.

[0058] Optionally, it further comprises a box, the front panel of the box is provided with a strip hole, the status indicator light is arranged on the front panel, the rear panel of the box is provided with a fan, and the high-voltage output connector, the high-voltage input connector, the fault signal input connector and the contactor signal input connector are arranged on the rear panel;

[0059] In the above embodiment, if Figure 6 As shown, the box body is made of cold-rolled steel plate, and the size is 50cm*48.26cm*13.335cm*(length*width*height). The utility model contains two 220V power supply fans. The fans are axial flow fans specially used for industrial cabinet chassis. Their main function is to transfer the internal heat of the high-voltage load simulation device to the outside through air cooling mode. The utility model uses the Fenglu brand SF12025ATP / N2122HBL fan, and the 220V power supply is connected from the outside through the 5th, 6th and 7th channels of the high-voltage input connector. The interactive cable between the high-voltage load simulation device of the utility model and the external device has been led to the female aviation plug on the rear panel of the device, and the connection between the device and the external device can be quickly established through the aviation plug; the internal layout of the utility model plans the heat dissipation channel, and is equipped with a heat dissipation fan to quickly transfer the heat emitted by the high-power heating device to the outside of the utility model device, ensuring the stable operation of the high-voltage load simulation device of the utility model.

[0060] like Figure 4 and 5 As shown, the front panel of the device is provided with regular strip holes to facilitate the transfer of heat from the inside of the device to the outside. At the same time, the front panel is arranged with 24 status indicators, and the signal names of the 24 indicators are silk-screened on the front panel. The meanings of the indicator signals are as follows:

[0061] 1.PosFusFail: Main positive relay fuse fault indicator

[0062] 2.PosRlyStk: Main positive relay adhesion fault indicator

[0063] 3.PosRlyCtrFail: Main positive relay control failure indicator

[0064] 4.PosRlyOpn: Main positive relay open circuit fault indicator

[0065] 5.DCposRlyStk fast charge positive relay adhesion fault indicator

[0066] 6.DCposRlyCtrFail fast charge positive relay control failure indicator

[0067] 7.DCposRlyOpn fast charge positive relay open circuit fault indicator

[0068] 8. PreRlyStk pre-charge relay adhesion fault indicator

[0069] 9.PreRlyCtrFail: Pre-charge relay control failure indicator

[0070] 10.PreRlyOpn: Pre-charge relay open circuit fault indicator

[0071] 11.30Ω: 30Ω pre-charge group

[0072] 12.50Ω: 50Ω pre-charge group

[0073] 13.100Ω: 100Ω pre-charge group

[0074] 14.DisRlyCtr: Discharge circuit is turned on

[0075] 15.NegFusFail: Main negative relay fuse fault indicator

[0076] 16.NegRlyStk: Main negative relay adhesion fault indicator

[0077] 17.NegRlyCtrFail: Main negative relay control failure fault indicator

[0078] 18.NegRlyOpn: Main negative relay open circuit fault indicator

[0079] 19.DCnegRlyStk fast charge negative relay adhesion fault indicator

[0080] 20.DCnegRlyCtrFail Fast charge negative relay control failure fault indicator

[0081] 21.DCnegRlyOpn fast charge negative relay open circuit fault indicator

[0082] 22.PTCnegRlyStk fast charge negative relay adhesion fault indicator

[0083] 23.PTCnegRlyCtrFail fast charge negative relay control failure fault indicator

[0084] 24.PTCnegRlyOpn fast charge negative relay open circuit fault indicator

[0085] Optionally, a first fuse simulation module is connected in series between the high-voltage input connector port of the positive pole of the battery pack output voltage and the input end of the first parallel circuit, and a second fuse simulation module is connected in series between the high-voltage input connector port of the negative pole of the battery pack output voltage and the output end of the main negative contactor simulation module.

[0086] In the above embodiment, Figure 2 As shown in the figure, the Swich1 and Swich15 relays are used to simulate the high-voltage fuse failure of the new energy vehicle. When the Swich1 or Swich15 relay is energized, it indicates the fuse failure.

[0087] Optionally, the discharge circuit includes a discharge capacitor, a discharge circuit start-up module and a discharge resistor. The discharge circuit start-up module and the discharge resistor are connected in series and then in parallel with the discharge capacitor.

[0088] In the above embodiment,

[0089] On the other hand, an in-the-loop test device is provided, comprising any of the above-mentioned high-voltage load simulation devices for testing a power battery management system.

[0090] In the above embodiment, the high-voltage load simulation device has a box body made of cold-rolled steel plate with dimensions of 50cm×48.26cm×13.335cm (length×width×height), which is convenient for installation in the battery management system hardware-in-the-loop test equipment (HIL) cabinet for use; as a component of the hardware-in-the-loop test equipment, it can realize the high-voltage pre-charging process simulation of new energy electric vehicles, and the short-circuit and open-circuit faults of multiple points in the high-voltage circuit, so as to meet the BMS test work in complex environments.

[0091] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-voltage load simulation device based on power battery management system testing, characterized in that: It includes a contactor fault simulation module, which has a test contactor and a fault simulation module, and the contactor fault simulation module is used to simulate the fault of the corresponding test contactor; the contactor fault simulation module includes a main positive contactor simulation module, a pre-charge contactor simulation module, a heating contactor simulation module, a discharge simulation module, a main negative contactor simulation module, a DC fast charge positive contactor simulation module and a DC fast charge negative contactor simulation module; A first parallel circuit, wherein the first parallel circuit comprises a main positive contactor simulation module and a pre-charge contactor simulation module, and the main positive contactor simulation module and the pre-charge contactor simulation module are connected in parallel; A second parallel circuit, wherein the second parallel circuit comprises a heating contactor simulation module and a discharge circuit, and the heating contactor simulation module and the discharge circuit are connected in parallel; The first parallel circuit input end is connected to the DC fast charging positive contactor simulation module output end, the first parallel circuit output end is connected to the second parallel circuit input end, the second parallel circuit output end is connected to the main negative contactor simulation module input end, and the main negative contactor simulation module output end is connected to the DC fast charging negative contactor simulation module input end; The input end of the first parallel circuit is connected to the positive pole of the output voltage of the battery pack through a high-voltage input connector, the input end of the DC fast charging positive contactor simulation module is connected to the positive pole of the charging pile power supply through a high-voltage input connector, the output end of the main negative contactor simulation module is connected to the negative pole of the output voltage of the battery pack through a high-voltage input connector, and the output end of the DC fast charging negative contactor simulation module is connected to the negative pole of the charging pile power supply through a high-voltage input connector.

2. A high-voltage load simulation device based on power battery management system testing according to claim 1, characterized in that: The first parallel circuit also includes a pre-charging resistor module. The pre-charging contactor simulation module is connected in series with the pre-charging resistor module and then connected in parallel with the main positive contactor simulation module. The resistance value of the pre-charging resistor module is changed to adapt to the test of different battery management systems.

3. A high-voltage load simulation device based on power battery management system testing according to claim 1, characterized in that: include: The first end and the second end of the coil of the test contactor are connected to the contactor signal input connector, the first end is connected to the external input high-side drive signal through the contactor signal input connector, and the second end is connected to the external input low-side drive signal through the contactor signal input connector; The fault simulation module includes: Adhesion simulation module, the adhesion simulation module is connected in parallel with the test contactor; A loss of control simulation module, the loss of control simulation module is connected in series between the first end and the contactor signal input connector; The simulation module cannot be attracted. The adhesion simulation module is connected in parallel with the contactor and then in series with the simulation module that cannot be attracted.

4. A high-voltage load simulation device based on power battery management system testing according to claim 3, characterized in that: It also includes a fault signal input connector, the fault simulation module is connected to the fault signal input connector, and the fault signal input connector is used to access the external input fault signal.

5. A high-voltage load simulation device based on power battery management system testing according to claim 4, characterized in that: The fault simulation module also includes a status indicator light. When the fault simulation module receives a fault signal, the status indicator light is turned on.

6. A high-voltage load simulation device based on power battery management system testing according to claim 5, characterized in that: It also includes a high-voltage output connector, a high-voltage sampling point is set, and the high-voltage sampling point is connected to the high-voltage output connector.

7. A high-voltage load simulation device based on power battery management system testing according to claim 6, characterized in that: It also includes a box body, the front panel of the box body is provided with a strip hole, the status indicator light is arranged on the front panel, the rear panel of the box body is arranged with a fan, and the high-voltage output connector, high-voltage input connector, fault signal input connector and contactor signal input connector are arranged on the rear panel.

8. A high voltage load simulation device based on power battery management system testing according to claim 1, characterized in that: include: A first fuse simulation module is connected in series between the high-voltage input connector port of the positive pole of the battery pack output voltage and the input end of the first parallel circuit, and a second fuse simulation module is connected in series between the high-voltage input connector port of the negative pole of the battery pack output voltage and the output end of the main negative contactor simulation module.

9. A high-voltage load simulation device based on power battery management system testing according to claim 1, characterized in that: The discharge circuit includes a discharge capacitor, a discharge circuit start module and a discharge resistor. The discharge circuit start module and the discharge resistor are connected in series and then connected in parallel with the discharge capacitor.

10. An in-loop test device, characterized in that: A high-voltage load simulation device based on power battery management system testing comprising any one of claims 1 to 9.

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