Circuit, device and system for BMS test

Abstract

The utility model provides a circuit, a device and a system used for BMS testing. The circuit comprises a first positive pole branch, a second positive pole branch, a first negative pole branch and a second negative pole branch. The input ends of the first positive pole branch and the first negative pole branch are used for being connected with a power supply positive pole output port and a power supply negative pole output port of the HIL equipment; the input end of the second anode branch is connected between the input end and the output end of the first anode branch, and a first relay is arranged; the input end of the second cathode branch is connected between the input end and the output end of the first cathode branch, a second relay is arranged, and the control end of each relay is used for being connected with a control signal port of the BMS controller; and the output end of each branch is used for being connected with a corresponding sampling port on the BMS controller. According to the scheme, the high-voltage operation environment of the vehicle is simulated through the real circuit, the authenticity of the simulated high-voltage operation environment is guaranteed, and then the accuracy of BMS testing through the HIL is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management systems, and in particular to a circuit, a device and a system for BMS testing. Background Art

[0002] With the recent development of new energy technologies, electric vehicles have also seen large-scale growth. For electric vehicles, the Battery Management System (BMS) is a core component that ensures vehicle safety and functional performance. Therefore, BMS testing and verification are particularly important. One of the key aspects of BMS testing is verifying whether its high-voltage performance meets design requirements. Currently, hardware-in-the-loop (HIL) testing platforms are commonly used to simulate the high-voltage operating environment of battery cells in vehicles and conduct high-voltage performance testing on the BMS.

[0003] However, the HIL test platform usually uses models or simulations to simulate high-voltage operating conditions. Simulations using models or simulations may result in errors, thereby affecting the accuracy of BMS testing. Utility Model Content

[0004] The utility model proposes a circuit, device and system for BMS testing, which can ensure the authenticity of the simulated vehicle high-voltage operating environment, thereby improving the accuracy of BMS testing using HIL.

[0005] The first embodiment of the present invention provides a circuit for BMS testing, comprising a first positive branch, a second positive branch, a first negative branch, and a second negative branch;

[0006] The input end of the first positive branch is used to connect to the positive output port of the power supply of the hardware-in-the-loop (HIL) device, and the input end of the first negative branch is used to connect to the negative output port of the power supply of the HIL device.

[0007] The input end of the second positive branch is connected between the input end and the output end of the first positive branch. A first relay is provided on the second positive branch. The control end of the first relay is used to be connected to the control signal port of the BMS controller to receive the relay control signal output by the BMS controller.

[0008] The input end of the second negative branch is connected between the input end and the output end of the first negative branch, a second relay is provided on the second negative branch, and a control end of the second relay is used to be connected to the control signal port of the BMS controller to receive the relay control signal output by the BMS controller;

[0009] The output ends of the first positive branch, the second positive branch, the first negative branch, and the second negative branch are respectively used to be connected to corresponding sampling ports on the BMS controller.

[0010] In an optional embodiment, the circuit further includes a pre-charge branch connected in parallel with the second positive branch;

[0011] The pre-charging branch is provided with a third relay and a pre-charging resistor;

[0012] The control end of the third relay is used to be connected to the control signal port of the BMS controller.

[0013] In an optional embodiment, the control ends of the first relay, the second relay and the third relay are further connected to corresponding switching devices;

[0014] The first relay, the second relay, and the third relay are connected to the control signal port of the BMS controller through corresponding switching devices.

[0015] In an optional implementation, the control end of the switch device is used to connect to the control signal port of the HIL device to receive a control signal output by the HIL device for controlling the switch device to be turned on or off.

[0016] In an optional embodiment, the switching device is an N-channel depletion-mode metal oxide semiconductor field effect transistor MOSFET tube;

[0017] The gate of the MOSFET tube is used to connect to the control signal port of the HIL device, the source of the MOSFET tube is used to connect to the control signal port of the BMS controller, and the drain of the MOSFET tube is connected to the control end of the corresponding relay.

[0018] In an optional embodiment, the circuit further includes a first insulation resistor and a second insulation resistor;

[0019] One end of the first insulation resistor is connected to the first positive branch, and the other end of the first insulation resistor is connected to the reference voltage terminal;

[0020] One end of the second insulation resistor is connected to the first negative electrode branch, and the other end of the second insulation resistor is connected to the reference voltage end.

[0021] In an optional embodiment, the resistance value of the first insulation resistor is greater than or equal to a first preset value;

[0022] The resistance value of the second insulation resistor is greater than or equal to a second preset value.

[0023] A second embodiment of the present invention provides a device for BMS testing, the device comprising a housing and a circuit for BMS testing as described in any one of the first aspects above;

[0024] The circuit for BMS testing is accommodated in the housing.

[0025] In an optional implementation, the other ends of the first insulation resistor and the second insulation resistor in the circuit for BMS testing are connected to the housing.

[0026] The third embodiment of the present invention provides a system for BMS testing, the system comprising a HIL device, a BMS controller, and the apparatus for BMS testing as described in the second aspect above;

[0027] The input end of the first positive branch of the device for BMS testing is connected to the positive output port of the power supply of the HIL device, and the input end of the first negative branch of the device for BMS testing is connected to the negative output port of the power supply of the HIL device;

[0028] The output ends of the first positive branch, the second positive branch, the first negative branch, and the second negative branch in the device for BMS testing are respectively connected to corresponding sampling ports on the BMS controller.

[0029] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0030] An embodiment of the present utility model provides a circuit for BMS testing, the structure of which imitates the high-voltage topology system of a vehicle. When performing a test, the circuit is connected to a HIL device and a BMS controller respectively, and the high-voltage operating environment of a battery unit in a vehicle is simulated through the circuit. Since the circuit structure is designed to simulate the high-voltage topology system of a vehicle, when applied to the test of the BMS controller based on HIL, the authenticity of the simulated high-voltage operating environment is guaranteed compared with the use of HIL devices to simulate or emulate the high-voltage operating environment through a model, thereby improving the accuracy of the BMS test using HIL.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 The figure shows a circuit structure diagram of a circuit for BMS testing provided by an embodiment of the present utility model;

[0034] Figure 2 The figure shows a timing diagram of the voltage signals of each branch in a circuit for BMS testing provided by an embodiment of the present invention;

[0035] Figure 3 A structural diagram of a system for BMS testing provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0036] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0038] First, an embodiment of the present invention provides a circuit for BMS testing. The circuit is used in a scenario where BMS testing is performed based on HIL equipment, and is connected to the HIL equipment and the BMS controller that needs to be tested respectively. The circuit replaces the HIL equipment to simulate the vehicle's high-voltage operating environment, thereby improving the authenticity of the simulated vehicle's high-voltage operating environment. Moreover, since it is externally connected to the BMS controller and the HIL equipment, it can be reused in various HIL devices.

[0039] Figure 1 A schematic diagram of a circuit for BMS testing provided by an embodiment of the present invention is shown. Figure 1 As shown, the circuit includes a first positive branch 110, a second positive branch 120, a first negative branch 130, and a second negative branch 140; wherein the input end of the first positive branch 110 is used to connect to the positive output port of the power supply of the HIL device, and the input end of the first negative branch 130 is used to connect to the negative output port of the power supply of the HIL device;

[0040] The input end of the second positive branch 120 is connected between the input end and the output end of the first positive branch 110. The second positive branch 120 is provided with a first relay 121. The control end of the first relay 121 is used to be connected to the control signal port of the BMS controller to receive the relay control signal output by the BMS controller;

[0041] The input end of the second negative branch 140 is connected between the input end and the output end of the first negative branch 130. A second relay 141 is provided on the second negative branch 140. The control end of the second relay is used to be connected to the control signal port of the BMS controller to receive the relay control signal output by the BMS controller;

[0042] The output ends of the first positive branch 110 , the second positive branch 120 , the first negative branch 130 , and the second negative branch 140 are respectively used to connect to corresponding sampling ports on the BMS controller.

[0043] Among them, the HIL device can simulate the high-voltage signal of the battery pack and output the high-voltage simulation signal to the first positive branch 110, the second positive branch 120, the first negative branch 130 and the second negative branch 140. In a specific implementation, two power output ports are provided on the HIL, one port is used to output the positive high-voltage signal, which can be marked as HV+, and the other port is used to output the negative high-voltage signal, which can be marked as HV-. When testing the BMS controller, the input end of the first positive branch 110 is inserted into the HV+ port of the HIL device to achieve connection with the positive power output port of the HIL device and receive the positive high-voltage signal simulated by the HIL device; the input end of the first negative branch 130 is inserted into the HV- port of the HIL device to achieve connection with the negative power output port of the HIL device and receive the negative high-voltage signal simulated by the HIL device.

[0044] During the test, the BMS controller collects the voltage signals output by the first positive branch 110, the second positive branch 120, the first negative branch 130, and the second negative branch 140. In an optional embodiment, the BMS controller is provided with sampling ports corresponding to each branch, such as a first sampling port, a second sampling port, a third sampling port, and a fourth sampling port. The output end of the first positive branch 110 may be connected to the first sampling port, and the voltage signal output by the first positive branch 110 may be collected through the first sampling port. The output end of the second positive branch 120 may be connected to the second sampling port, and the voltage signal output by the second positive branch 120 may be collected through the second sampling port. The output end of the first negative branch 130 may be connected to the third sampling port, and the voltage signal output by the first negative branch 130 may be collected through the third sampling port. The output end of the second negative branch 140 may be connected to the fourth sampling port, and the voltage signal output by the second negative branch 140 may be collected through the fourth sampling port.

[0045] In an optional embodiment, the output ends corresponding to the first positive branch 110, the second positive branch 120, the first negative branch 130, and the second negative branch 140 can also be referred to as high-voltage voltage monitoring points, which are used for the BMS controller to collect voltage signals. Specifically, the output end of the first positive branch 110 can be marked as a Pack+ monitoring point, the output end of the second positive branch 120 can be marked as a Link+ monitoring point, the output end of the first negative branch 130 can be marked as a Pack- monitoring point, and the output end of the second negative branch 140 can be marked as a Link- monitoring point. In this way, when testing is required, the Pack+ monitoring point is inserted into the first sampling port of the BMS controller, the Link+ monitoring point is inserted into the second sampling port of the BMS controller, the Pack- monitoring point is inserted into the third sampling port of the BMS controller, and the Link- monitoring point is inserted into the fourth sampling port of the BMS controller.

[0046] In actual application scenarios, one of the functions of the BMS controller is to control the opening or closing of relays on each branch of the vehicle's high-voltage topology system, thereby realizing operations such as powering on or off the vehicle. Therefore, one of the test contents of the embodiment of the present utility model is to test the control performance of the BMS controller over the relays. Therefore, in the embodiment of the present utility model, a first relay 121 is provided on the second positive branch 120, and a second relay 141 is provided on the second negative branch 140. When performing the test, the control ends of the first relay and the second relay are connected to the control signal port of the BMS controller. A corresponding number of control signal ports are provided on the BMS controller. The control end of the first relay 121 is connected to the first control signal port on the BMS controller, and the control end of the second relay 141 is connected to the second control signal port on the BMS controller. The relay control signal output by the BMS controller through the first control signal port can control the opening or closing of the first relay 121, and thereby control the on-off of the second positive branch 120, that is, the voltage signal output by the second positive branch 120 can reflect the opening or closing of the first relay 121; similarly, the relay control signal output through the second control signal port can control the opening or closing of the second relay 141, and thereby control the on-off of the second negative branch 140, that is, the voltage signal output by the second negative branch 140 can reflect the opening or closing of the second relay 141.

[0047] For example, in an optional embodiment, when the vehicle is started, the BMS controller sends a closing instruction to the relay on the corresponding branch, for example, sends a closing instruction to the first relay 121 arranged on the second positive branch 120. After receiving the control instruction sent by the BMS controller, the first relay 121 performs a closing operation, thereby forming a path for the second positive branch 120. Therefore, the BMS controller can collect the corresponding voltage signal through the Link+ monitoring point of the second positive branch 120. The BMS controller determines whether it has actually achieved control of the relay based on the collected voltage signal.

[0048] In addition, it should be noted that in the embodiment of the present invention, when testing the control of the BMS controller over the corresponding relay based on the voltage output by the second positive branch 120 and the second negative branch 140, other factors can also be excluded based on the voltage signals output by the first positive branch 110 and the first negative branch 130. For example, whether the battery cell actually outputs a voltage signal, when the voltage signal output by the first positive branch 110 is normal, but the voltage signal output by the second positive branch 120 is abnormal, it can be determined that the BMS controller has not achieved control over the first relay 121.

[0049] It should be noted that both the first relay 121 and the second relay 141 are high-voltage relays. In this embodiment of the present invention, to simulate a real vehicle, the first relay 121 and the second relay 141 can be selected to be consistent with the relays used in a real vehicle. For example, the first relay 121 can be a positive relay of the same model as a real vehicle, and the second relay 141 can be a negative relay of the same model as a real vehicle.

[0050] The circuit for BMS testing provided by the embodiment of the present invention has a structure that imitates the high-voltage topology system of a vehicle. During testing, the circuit is connected to the HIL device and the BMS controller respectively, and the high-voltage operating environment of the battery unit in the vehicle is simulated through the circuit. Since the circuit structure is designed to simulate the high-voltage topology system of the vehicle, when applied to the HIL-based testing of the BMS controller, compared with the use of HIL devices to simulate or emulate the high-voltage operating environment through model simulation, the authenticity of the high-voltage operating environment is guaranteed, thereby improving the accuracy of BMS testing using HIL.

[0051] Usually in a real vehicle environment, the output end of the second positive branch 120 is to be connected to the vehicle's motor controller. At the initial stage of vehicle power-on, the large capacitor in the motor controller will be charged. This capacitor will generate a very large charging current at the moment the circuit is closed, which may cause a huge impact on the power supply and rectifier components, and even damage related devices. Therefore, in order to reduce the impact current during power-on, thereby protecting key components such as the motor controller from the impact of instantaneous large current, it is necessary to set a pre-charge branch, and a relay is also required on the pre-charge branch. Therefore, in order to verify the control of the relay on the circuit by the BMS controller, the circuit for BMS testing provided by the embodiment of the utility model also needs to set a corresponding pre-charge branch, such as Figure 1 As shown, the circuit provided by the embodiment of the present utility model further includes a pre-charge branch 150 connected in parallel with the second positive branch 120;

[0052] The pre-charging branch is provided with a third relay 151 and a pre-charging resistor 152 , and the control end of the third relay 151 is used to be connected to the control signal port of the BMS controller.

[0053] During testing, the control end of the third relay 151 is connected to the control signal port of the BMS controller, such as the third control signal port of the BMS controller. The BMS controller can output a relay control signal through the third control signal port to control the opening or closing of the third relay 151, thereby switching the pre-charge branch 150 on and off. Therefore, during testing, by collecting the voltage signal output from the output end of the pre-charge branch 150, it can be determined whether the BMS controller has achieved control over the third relay 151.

[0054] In an embodiment of the present invention, the output end of the pre-charge branch 150 is connected between the first relay on the second positive branch 120 and the output end of the second positive branch 120, that is, the pre-charge branch 150 and the second positive branch 120 share the Link+ monitoring point. The input end of the pre-charge branch 150 is connected to the first positive branch 110, or it can also be connected to a position between the first positive branch 110 and the first relay. The embodiment of the present invention does not limit the specific connection position of the input end of the pre-charge branch 150, as long as the pre-charge branch 150 and the second positive branch 120 can be connected in parallel and the input end of the pre-charge branch 150 can receive the high-voltage simulation signal output by the HV+ port.

[0055] In an embodiment of the present application, by setting a pre-charging branch 150 in parallel with the second positive branch 120, a real vehicle high-voltage topology is simulated, and the control of the third relay on the pre-charging branch 150 by the BMS controller is tested, thereby ensuring the comprehensiveness of the test of the BMS controller.

[0056] For example, in a specific application scenario, the first relay can be a positive relay consistent with the vehicle selection, such as can be marked as a PosRly relay, the second relay can be a negative relay consistent with the vehicle selection, such as can be marked as a NegRly relay, and the third relay can be a pre-charge relay consistent with the vehicle selection, such as can be marked as PreRly.

[0057] For example, in a real application scenario, when the vehicle is powered on, the third relay can be controlled to close by the BMS controller first, thereby realizing the connection of the pre-charging branch 150, and the voltage signal on the pre-charging branch 150 can slowly rise; when the voltage signal on the pre-charging branch 150 reaches the target value, the first relay 121 on the second positive branch 120 is controlled to close by the BMS controller, thereby realizing the connection of the second positive branch 120, and at the same time, the third relay is controlled to disconnect by the BMS controller. Figure 2 The figure shows the voltage changes at the output terminals of each branch when the first relay, the second relay and the third relay are controlled differently. Figure 2As shown, the ordinate represents the voltage signal, and the abscissa represents the different controls performed on the relays at different times as time changes. The opening or closing of each relay does not affect the voltage output from the output end of the first positive branch and the first negative branch, that is, the voltage collected by the BMS controller from the Pack+ monitoring point and the Pack- monitoring point does not change with the opening or closing of the relay. When the PreRly relay (the third relay) and the NegRly relay (the second relay) are in the disconnected state, the pre-charge branch and the second negative branch will not output a voltage signal, that is, the voltage signal collected by the BMS controller from the Link+ and Link- monitoring points is zero; when the BMS controller controls the PreRly relay and the NegRly relay to close, since a pre-charge resistor is provided on the pre-charge branch, the voltage signal collected by the BMS controller from the Link+ monitoring point slowly rises, and the voltage signal collected by the BMS controller from the Link- monitoring point reaches the target value and no longer changes. When the voltage signal of the Link+ monitoring point collected by the BMS controller reaches a certain value, the BMS controller controls the PreRly relay to open and controls the PosRly relay (the first relay) to close. At this time, the voltage signal collected by the BMS controller from the Link+ monitoring point no longer changes. When the BMS controller controls the NegRly relay and PosRly relay to open, the voltage signals collected by the BMS controller from the Link+ monitoring point and the Link- monitoring point become zero.

[0058] In an optional embodiment, in order to implement relay fault testing, a switching device can also be provided at the control end of each relay, and the fault simulation of the corresponding relay can be performed by disconnecting the switching device. Therefore, in the circuit for BMS testing provided in the embodiment of the present application, the control ends of the first relay 121, the second relay 141, and the third relay 151 are also connected to corresponding switching devices;

[0059] The first relay 121 , the second relay 141 and the third relay 151 are connected to the control signal port of the BMS controller through corresponding switching devices.

[0060] In a specific implementation, in order to simulate the failure of the first relay 121, the second relay 141 and the third relay 151 respectively, a control terminal of a relay may be connected to a switch device, such as Figure 1 As shown, the control end of the first relay 121 is connected to the first switching device 122 , the control end of the second relay 141 is connected to the second switching device 142 , and the control end of the third relay 151 is connected to the third switching device 153 .

[0061] During testing, by controlling the first switching device 122 to be off, the first relay 121 is unable to properly receive the relay control signal transmitted by the BMS controller, thereby simulating a first relay failure. By controlling the second switching device 142 to be off, the second relay 141 is unable to properly receive the relay control signal transmitted by the BMS controller, thereby simulating a second relay failure. Similarly, by controlling the third switching device 153 to be off, a third relay 151 failure can be simulated.

[0062] During a specific test, it is possible to select which switch device to control to be disconnected according to actual test needs.

[0063] In a specific implementation, corresponding to the symbols of each relay, the control signal output terminal on the BMS controller for outputting control of the first relay can be marked as PosRly_Ctl, the control signal output terminal on the BMS controller for outputting control of the second relay can be marked as NegRly_Ctl, and the control signal output terminal on the BMS controller for outputting control of the third relay can be marked as PreRly_Ctl.

[0064] In specific implementations, there are various ways to control the opening or closing of a switch device. For example, a button may be provided to control the opening or closing of the switch device. Of course, in some other optional implementations, the opening or closing of a switch device may also be controlled by inputting a control signal to the switch device. For example, a control signal may be output to the corresponding switch device via a HIL device to control the opening or closing of the corresponding switch device.

[0065] Therefore, in an optional embodiment, the control end of the switch device is used to connect to the control signal port of the HIL device to receive a control signal output by the HIL device for controlling the switch device to be turned on or off.

[0066] Specifically, the control end of the first switch device 122 is used to connect to the first control signal port of the HIL device, the control end of the second switch device 142 is used to connect to the second control signal port of the HIL device, and the control end of the third switch device 153 is used to connect to the third control signal port of the HIL device. For example, the first control signal port of the HIL device can be marked as PosRly_FIU, the second control signal port of the HIL device can be marked as NegRly_FIU, and the third control signal port of the HIL device can be marked as PreRly_FIU. Figure 1As shown, the first switch device 122 is used to connect to the PosRly_FIU port of the HIL device, the second switch device 142 is used to connect to the NegRly_FIU port of the HIL device, and the third switch device 153 is used to connect to the PreRly_FIU port of the HIL device.

[0067] During the test, the control end of each switching device is connected to the control signal port of the HIL device. For example, the control end of the first switching device 122 is connected to the PosRly_FIU port of the HIL device, so that the HIL device controls the first switching device 122, thereby realizing the fault simulation of the first relay. The control end of the second switching device 142 is connected to the NegRly_FIU port of the HIL device, so that the HIL device controls the second switching device 142, thereby realizing the fault simulation of the second relay. The control end of the third switching device 153 is connected to the PreRly_FIU port of the HIL device, so that the HIL device controls the third switching device 153, thereby realizing the fault simulation of the third relay.

[0068] For example, in an optional embodiment, the control signal output by the HIL device can be 0 or 1. When the control signal output by the HIL device is 1, the corresponding switching device is controlled to be turned on. When the control signal output by the HIL device is 0, the corresponding switching device is controlled to be turned off, thereby realizing fault simulation of the relay controlled by the switching device.

[0069] In an embodiment of the present utility model, corresponding switching devices are provided at the control ends of the first relay 121, the second relay 141 and the third relay 151. By turning on or off the switching devices, it is controlled whether the corresponding relays can receive the control signals sent by the BMS controller, thereby realizing relay fault simulation, so that the BMS controller can test the fault conditions of the relays and formulate corresponding fault strategies.

[0070] In an optional embodiment, as Figure 1 As shown, the switching device is an N-channel depletion-type metal-oxide-semiconductor field-effect transistor (MOSFET);

[0071] Among them, the gate of the above-mentioned MOSFET tube is used to connect to the control signal port of the HIL device, the source of the MOSFET tube is used to connect to the control signal port of the BMS controller, and the drain of the MOSFET tube is connected to the control end of the corresponding relay.

[0072] In specific implementation, Figure 1 As shown, the control end of the first relay 121 is connected to a MOSFET tube, the control end of the second relay 141 is connected to a MOSFET tube, and the control end of the third relay 151 is connected to a MOSFET tube.

[0073] For each MOSFET tube, the gate of the MOSFET tube is used to connect to the control signal of the HIL device. As the control port of the MOSFET tube, the gate can control the disconnection or conduction of the MOSFET through the control signal output by the HIL device, that is, whether the source to the drain is conductive, thereby controlling whether the relay connected to it can receive the relay control signal transmitted by the BMS controller, thereby realizing relay fault simulation.

[0074] In addition, it should be noted that Figure 1 The device in the dotted circle in the upper left corner is an enlarged schematic diagram of the first switch device 122. In an optional embodiment, the first switch device 122, the second switch device 142 and the third switch device 153 can all be used as follows Figure 1 The device structure within the dotted circle in the upper left corner.

[0075] Of course, in the embodiment of the present invention, the switching device selected is an N-channel depletion-type MOSFET tube. In addition, in some other embodiments, the switching device used can also be a P-channel depletion-type MOSFET tube, or the above-mentioned switching device can also be a triode. In addition, the switching devices connected to each relay can be the same switching device or different switching devices. In the specific implementation, it can be set according to the actual scene requirements. The embodiment of the present invention is only an illustrative description of this and is not a limitation of the embodiment of the present invention.

[0076] During the test, there will be testers to operate, therefore, in order to ensure the safety and insulation performance of the test circuit, and thus protect the personal safety of the testers, the circuit provided by the embodiment of the present invention is also provided with an insulation resistor; Figure 1 As shown, in an optional implementation manner, the circuit provided by the embodiment of the present utility model further includes a first insulation resistor 160 and a second insulation resistor 170;

[0077] Among them, one end of the first insulation resistor 160 is connected to the first positive branch 110, and the other end of the first insulation resistor is connected to the reference voltage end; one end of the second insulation resistor 170 is connected to the first negative branch 130, and the other end of the second insulation resistor 170 is connected to the reference voltage end.

[0078] Exemplarily, the reference voltage terminal may be a housing where the circuit is located, etc. Of course, the reference voltage terminal may also be other terminals, which will not be described in detail here.

[0079] In the embodiment of the present invention, in order to improve the safety of the test, the first insulation resistor and the second insulation resistor in the embodiment of the present invention can be selected to have a larger resistance value.

[0080] Exemplarily, the resistance value of the first insulation resistor is greater than or equal to a first preset value; the resistance value of the second insulation resistor is greater than or equal to a second preset value.

[0081] The specific values ​​of the first preset value and the second preset value may be the same or different.

[0082] Exemplarily, the first preset value may be 500,000Ω, and the second preset value may be 500,000Ω.

[0083] Corresponding to Figures 1 to 2 The circuit for BMS testing provided in the embodiment shown in the figure is based on the same idea. The embodiment of the present invention also provides a device for BMS testing. The device includes a housing and the above-mentioned Figures 1 to 2 The illustrated embodiment provides a circuit for BMS testing;

[0084] The circuit for BMS testing is housed in the housing.

[0085] For example, the terminals of the circuit for BMS testing for connecting with the HIL device and the BMS controller are exposed outside the housing, thereby facilitating insertion into corresponding ports of the HIL device and the BMS controller.

[0086] In an optional embodiment, the other ends of the first insulation resistor and the second insulation resistor in the circuit for BMS testing are connected to the housing of the device.

[0087] That is, one end of the first insulation resistor is connected to the first positive branch, and the other end of the first insulation resistor is connected to the housing. One end of the second insulation resistor is connected to the first negative branch, and the other end of the second insulation resistor is connected to the housing.

[0088] Among them, the device for BMS testing provided by the embodiment of the present utility model is the same as the device for BMS testing provided by the present utility model. Figures 1 to 2 The circuit for BMS testing provided in the illustrated embodiment is based on the same concept. The functions and specific implementation methods of the various components in the device for BMS testing provided in the embodiment of the utility model can refer to the aforementioned circuit embodiment for BMS testing and will not be repeated here.

[0089] Corresponding to the apparatus for BMS testing provided in the embodiment of the present invention, based on the same idea, the embodiment of the present invention further provides a system for BMS testing, which includes a HIL device, a BMS controller, and the apparatus for BMS testing provided in the embodiment of the present invention;

[0090] The input end of the first positive branch in the device for BMS testing is connected to the positive output port of the power supply of the HIL device, and the input end of the first negative branch in the device for BMS testing is connected to the negative output port of the power supply of the HIL device.

[0091] The output ends of the first positive branch, the second positive branch, the first negative branch, and the second negative branch in the device for BMS testing are respectively connected to corresponding sampling ports on the BMS controller.

[0092] Figure 3 A schematic diagram of the system structure of a BMS test system provided by an embodiment of the present invention is shown. Figure 3 As shown, the system for BMS testing includes a HIL device 210, a BMS controller 220, and an apparatus 230 for BMS testing;

[0093] Among them, the input end of the first positive branch in the device 230 for BMS testing is connected to the HV+ port of the HIL device 210, and the input end of the first negative branch is connected to the HV- port of the HIL device 210; the output end (Pack+ monitoring point) of the first positive branch is connected to the first sampling port of the BMS controller, the output end (Pack- monitoring point) of the first negative branch is connected to the third sampling port of the BMS controller 220, the output end (Link+ monitoring point) of the second positive branch is connected to the second sampling port of the BMS controller 220, and the output end (Link- monitoring point) of the second negative branch is connected to the fourth sampling port of the BMS controller 220.

[0094] The gate of the first switching device in the apparatus 230 for BMS testing is connected to the first control signal port (PosRly_FIU) of the HIL device, and is used to receive the switching device control signal sent by the HIL device through the first control signal port, thereby realizing the conduction or disconnection of the first switching device, thereby achieving the effect of simulating a relay failure; the source of the first switching device is connected to the first control signal port (PosRly_Ctl) of the BMS controller 220, and is used to receive the relay control signal sent by the BMS controller 220 through the first control signal port, and is used to control the opening or closing of the relay on the branch.

[0095] The gate of the second switching device in the device 230 for BMS testing is connected to the second control signal port (NegRly_FIU) of the HIL device 210, and is used to receive the switching device control signal sent by the HIL device 210 through the second control signal port, thereby realizing the conduction or disconnection of the second switching device, thereby achieving the effect of simulating a relay failure; the source of the second switching device is connected to the second control signal port (NegRly_Ctl) of the BMS controller 220, and is used to receive the relay control signal sent by the BMS controller 220 through the second control signal port, and is used to control the opening or closing of the relay on the branch.

[0096] The gate of the third switching device in the apparatus 230 for BMS testing is connected to the third control signal port (PreRly_FIU) of the HIL device 210, and is used to receive the switching device control signal sent by the HIL device 210 through the third control signal port, thereby realizing the conduction or disconnection of the third switching device, thereby achieving the effect of simulating a relay failure; the source of the third switching device is connected to the third control signal port (PreRly_Ctl) of the BMS controller 220, and is used to receive the relay control signal sent by the BMS controller 220 through the third control signal port, and is used to control the opening or closing of the relay on the branch.

[0097] In some specific embodiments, a port for connecting to each other is further provided between the HIL device 210 and the BMS controller 220 for implementing other connections between the HIL device 210 and the BMS controller 220 , and this part can be set according to actual needs.

[0098] Among them, the system for BMS testing provided by the embodiment of the present invention and the device for BMS testing provided by the embodiment of the present invention are based on the same concept. The functions and specific implementation methods of each component in the BMS testing system provided by the embodiment of the present invention can refer to the aforementioned device embodiment for BMS testing and will not be repeated here.

[0099] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A circuit for testing a battery management system (BMS), characterized in that: comprising a first positive electrode branch, a second positive electrode branch, a first negative electrode branch and a second negative electrode branch; The input end of the first positive branch is used to connect to the positive output port of the power supply of the hardware-in-the-loop (HIL) device, and the input end of the first negative branch is used to connect to the negative output port of the power supply of the HIL device. The input end of the second positive branch is connected between the input end and the output end of the first positive branch. A first relay is provided on the second positive branch. The control end of the first relay is used to be connected to the control signal port of the BMS controller to receive the relay control signal output by the BMS controller. The input end of the second negative branch is connected between the input end and the output end of the first negative branch, a second relay is provided on the second negative branch, and a control end of the second relay is used to be connected to the control signal port of the BMS controller to receive the relay control signal output by the BMS controller; The output ends of the first positive branch, the second positive branch, the first negative branch, and the second negative branch are respectively used to be connected to corresponding sampling ports on the BMS controller.

2. The circuit according to claim 1, wherein: The circuit further includes a pre-charge branch connected in parallel with the second positive electrode branch; The pre-charging branch is provided with a third relay and a pre-charging resistor; The control end of the third relay is used to be connected to the control signal port of the BMS controller.

3. The circuit according to claim 2, characterized in that The control ends of the first relay, the second relay and the third relay are also connected to corresponding switching devices; The first relay, the second relay, and the third relay are connected to the control signal port of the BMS controller through corresponding switching devices.

4. The circuit according to claim 3, characterized in that The control end of the switch device is used to connect to the control signal port of the HIL device to receive a control signal output by the HIL device for controlling the switch device to be turned on or off.

5. The circuit according to claim 4, characterized in that The switching device is an N-channel depletion-type metal oxide semiconductor field effect transistor MOSFET tube; The gate of the MOSFET tube is used to connect to the control signal port of the HIL device, the source of the MOSFET tube is used to connect to the control signal port of the BMS controller, and the drain of the MOSFET tube is connected to the control end of the corresponding relay.

6. The circuit according to any one of claims 1 to 5, characterized in that: The circuit further includes a first insulation resistor and a second insulation resistor; One end of the first insulation resistor is connected to the first positive branch, and the other end of the first insulation resistor is connected to the reference voltage terminal; One end of the second insulation resistor is connected to the first negative electrode branch, and the other end of the second insulation resistor is connected to the reference voltage end.

7. The circuit according to claim 6, characterized in that The resistance value of the first insulation resistor is greater than or equal to a first preset value; The resistance value of the second insulation resistor is greater than or equal to a second preset value.

8. A device for BMS testing, characterized in that: The device comprises a housing and a circuit for BMS testing according to any one of claims 1 to 7; The circuit for BMS testing is accommodated in the housing.

9. The device according to claim 8, characterized in that The other ends of the first insulation resistor and the second insulation resistor in the circuit for BMS testing are connected to the housing.

10. A system for BMS testing, characterized in that: The system comprises a HIL device, a BMS controller and the apparatus for BMS testing according to claim 8 or 9; The input end of the first positive branch of the device for BMS testing is connected to the positive output port of the power supply of the HIL device, and the input end of the first negative branch of the device for BMS testing is connected to the negative output port of the power supply of the HIL device; The output ends of the first positive branch, the second positive branch, the first negative branch, and the second negative branch in the device for BMS testing are respectively connected to corresponding sampling ports on the BMS controller.

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