Passenger car battery low-temperature heating test system, method, device, equipment and medium

Abstract

The invention provides a passenger car battery low-temperature heating test system, method, device and equipment and a medium, and the system comprises a passenger car battery low-temperature heating test system which is composed of a whole car domain controller, a control assembly and a BMS battery management subsystem, and the method comprises the steps: carrying out the whole car power-on of a target passenger car according to a passenger car test request for the low-temperature rapid heating of a battery; the battery temperature and the vehicle running state of the target passenger car are obtained, the battery temperature is judged based on the temperature interval, and at least one judgment node of heating needing and heating not needing is obtained; when the judgment result is that heating is needed, determining a heating gear and a target temperature according to the temperature interval of the battery temperature; and heating the target battery to the target temperature according to the heating gear. The device has the beneficial effects that the power battery of the vehicle can be rapidly heated in an extremely low temperature environment, and the self-heating test of the test battery is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of bus testing, and particularly to a bus battery low-temperature heating test system, method, device, equipment and medium. Background Art

[0002] When conducting battery low-temperature tests on pure electric buses, there is often no suitable low-temperature environment, making it impossible to accurately understand and improve the low-temperature characteristics of the battery, and it is difficult to achieve rapid and effective heating of the power battery in an extremely low-temperature environment for testing. Summary of the Invention

[0003] The main purpose of the embodiments of the present invention is to provide a bus battery low-temperature heating test system, method, device, equipment and medium, which realizes rapid heating of the power battery of the vehicle in an extremely low-temperature environment and realizes the test of the self-heating of the battery.

[0004] One aspect of the present invention provides a bus battery low-temperature heating test system, which is characterized by including:

[0005] A vehicle domain controller, a control assembly and a BMS battery management subsystem, which are connected to each other through a CAN bus between the vehicle domain controller, the control assembly and the BMS battery management subsystem;

[0006] The BMS battery management subsystem is connected to the battery box through a high-voltage box, and the BMS battery management subsystem and the high-voltage box form a high-voltage part;

[0007] The vehicle domain controller is connected to the VCU simulation platform, the low-voltage distribution box, the BMS battery management subsystem and the high-voltage part;

[0008] The control assembly is connected to the low-voltage distribution box, and the low-voltage distribution box is used to supply power and wake up the vehicle domain controller and the control assembly.

[0009] According to the bus battery low-temperature heating test system, the control assembly is respectively connected to the drive motor, the MCU simulation platform, the high-voltage box, the battery, the water pump and the fan; the control assembly is connected to the MCU simulation platform through a CAN bus, connected to the battery, the water pump and the fan through a low-voltage wire, connected to the high-voltage box through a high-voltage wire, and connected to the drive motor through a high-voltage wire and a signal wire; the control assembly also integrates a drive motor control module, a DC / DC module, a DC / AC oil pump control module and a DC / AC air pump control module.

[0010] According to the bus battery low-temperature heating test system, the low-voltage distribution box is respectively connected to the vehicle domain controller, the battery, the water pump and the fan through low-voltage wires.

[0011] One aspect of the present invention provides a method for testing the low-temperature heating of a bus battery. For the above method, it includes:

[0012] According to the low-temperature heating test request of the bus battery, power on the target bus for the whole vehicle;

[0013] Obtain the battery temperature and the vehicle operation state of the target bus, judge the battery temperature based on the temperature range, and obtain at least one judgment result of needing heating and not needing heating. The vehicle operation state includes one of a stationary state and a charging state;

[0014] When the judgment result is that heating is needed, determine the heating gear and the target temperature according to the temperature range where the battery temperature is located;

[0015] Heat the target battery according to the heating gear until the target temperature.

[0016] According to the method for testing the low-temperature heating of the bus battery, where powering on the target bus for the whole vehicle according to the low-temperature heating test request of the bus battery includes:

[0017] Power on the normal-fire circuit of the target vehicle for the whole vehicle;

[0018] After powering on the normal-fire circuit, close the toggle switch, and through the high-side drive relay of the BMS battery management subsystem and the delay relay to close, power on the switch-fire circuit of the whole vehicle. At the same time, the whole vehicle domain controller performs self-check. If the VCU simulation platform fails, a fault prompt is given. Otherwise, close the key on signal, and the VCU simulation platform passes the self-check, and send a command to close the main negative relay to the BMS battery management subsystem;

[0019] After receiving the main negative relay closing command, close the main negative relay, and at the same time feedback the main negative relay closing state to the whole vehicle domain controller. After receiving the main negative relay state feedback from the BMS battery management subsystem through the whole vehicle domain controller, send a power-on request to the control assembly;

[0020] After receiving the command by the control assembly, perform pre-charging first. After the control assembly completes the pre-charging, disconnect the pre-charge relay, close the main relay, power on the high voltage of the whole vehicle, and start the DCDC to work. The conditions for pre-charging include that the high-voltage self-check of the control assembly is correct and the voltage difference between the total voltage of the target battery and the pre-charge capacitor voltage meets the power-on requirements.

[0021] According to the method for testing the low-temperature heating of the bus battery, where obtaining the battery temperature and the vehicle operation state of the target bus, judging the battery temperature based on the temperature range, and obtaining at least one judgment result of needing heating and not needing heating:

[0022] After the bus is powered on, obtain the battery temperature and vehicle operating status of the target battery;

[0023] When the battery temperature is in one of the first temperature range, the second temperature range and the third temperature range, a heating judgment result is obtained, where the first temperature range is less than or equal to -30°C, the second temperature range is greater than -30°C and less than or equal to -15°C, and the third temperature range is greater than -15°C and the battery temperature is less than 0°C.

[0024] According to the bus battery low-temperature heating test method described above, where the battery temperature and the vehicle operating status of the target bus are obtained, and the battery temperature is judged based on the temperature range to obtain at least one judgment result of need to heat and no need to heat, including:

[0025] Calculate the pulse current frequency and amplitude according to the heating judgment result, determine the IGBT switch combination frequency and time in the three-phase circuit according to the pulse current frequency and amplitude, and generate a pulse current through the IGBT switch combination frequency and time to act on the target battery until the target temperature; where, when the target vehicle needs to be driven and the target temperature is greater than -5°C, stop heating, or when the target battery temperature is greater than 0°C, stop heating.

[0026] One aspect of the present invention provides a bus battery low-temperature heating test device, which is characterized in that it includes:

[0027] The first module is used to power on the whole vehicle of the target bus according to the bus battery low-temperature heating test request;

[0028] The second module is used to obtain the battery temperature and the vehicle operating status of the target bus, judge the battery temperature based on the temperature range, and obtain at least one judgment result of need to heat and no need to heat, and the vehicle operating status includes one of a stationary state and a charging state;

[0029] The third module is used to determine the heating gear and the target temperature according to the temperature range where the battery temperature is located when the judgment result is that heating is required;

[0030] The fourth module is used to heat the target battery until the target temperature according to the heating gear.

[0031] Another aspect of the embodiments of the present invention provides an electronic device, including a processor and a memory;

[0032] The memory is used to store programs;

[0033] The processor executes the program to implement the method described above.

[0034] An embodiment of the present invention also discloses a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of a computer device can read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method described above.

[0035] The beneficial effects of the present invention are as follows: Through the vehicle domain controller, the control assembly, and the battery management system BMS, the acquisition of the real battery state, vehicle state, and motor state is realized. An adjustable low-temperature test environment can perform the power-on and power-off control of the vehicle; the vehicle can be powered on in an extremely low-temperature environment, and the turn-off combination of the drive circuit IGBT can be controlled to realize the rapid heating of the power battery of the vehicle in an extremely low-temperature environment; a test method for self-heating of the test battery is realized through command power-on and heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0037] Figure 1 is a schematic diagram of the low-temperature heating test structure of the bus battery according to an embodiment of the present invention.

[0038] Figure 2 is a principle block diagram of the control assembly according to an embodiment of the present invention.

[0039] Figure 3 is a schematic diagram of the low-temperature heating test process of the bus battery according to an embodiment of the present invention.

[0040] Figure 4 is a schematic diagram of the power-on process of the test according to an embodiment of the present invention.

[0041] Figure 5 is a flow chart of the control strategy of the power system of the test according to an embodiment of the present invention.

[0042] Figure 6 is a schematic diagram of the low-temperature heating test device of the bus battery according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. In the following description, suffixes such as "module", "component", or "unit" used to denote elements are only for the convenience of describing the present invention and have no specific meaning of their own. Therefore, "module", "component", or "unit" can be used interchangeably. "First", "second", etc. are only used for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features. In the following description, the consecutive numbering of method steps is for the convenience of review and understanding. Considering the overall technical solution of the present invention and the logical relationship between each step, adjusting the execution order between steps will not affect the technical effects achieved by the technical solution of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0044] Reference Figure 1 , in which Figure 1 is a schematic diagram of the low-temperature heating test structure of the passenger car battery in an embodiment of the present invention. The vehicle domain controller, the control assembly, and the BMS battery management subsystem are connected to each other through a CAN bus; the BMS battery management subsystem is connected to the battery box through a high-voltage box, and the BMS battery management subsystem and the high-voltage box form a high-voltage part; the vehicle domain controller is connected to the VCU simulation platform, the low-voltage distribution box, the BMS battery management subsystem, and the high-voltage part; the control assembly is connected to the low-voltage distribution box, and the low-voltage distribution box is used to supply power and wake up the vehicle domain controller and the control assembly.

[0045] In some embodiments, the control assembly is respectively connected to the drive motor, the MCU simulation platform, the high-voltage box, the battery, the water pump, and the fan; the control assembly is connected to the MCU simulation platform through a CAN bus, connected to the battery, the water pump, and the fan through a low-voltage wire, connected to the high-voltage box through a high-voltage wire, and connected to the drive motor through a high-voltage wire and a signal wire;

[0046] In some embodiments, reference Figure 2 to the principle block diagram of the control assembly shown, where the control assembly also integrates a drive motor control module, a DC / DC module, a DC / AC oil pump control module, and a DC / AC air pump control module.

[0047] In some embodiments, the low-voltage distribution box is respectively connected to the vehicle domain controller, the battery, the water pump, and the fan through low-voltage wires.

[0048] In some embodiments, it consists of three major parts: the vehicle domain controller, the control assembly, and the BMS battery management subsystem. The three are connected through the CAN bus for information interaction and transmission. The high-voltage part is composed of the BMS battery management subsystem, the battery box, and the high-voltage box connected by high-voltage wires. The low-voltage part consists of the battery and the low-voltage distribution box, which provide wake-up power and low-voltage power to the components. The VCU simulation platform is connected to the vehicle domain controller through the CAN line. The control assembly is connected to the MCU simulation platform through the CAN line, directly connected to the drive motor through three-phase high-voltage wires, and at the same time connected to the fan and water pump through low-voltage wires.

[0049] Reference Figure 3 , wherein Figure 3 is a schematic diagram of the bus battery low-temperature heating test process according to an embodiment of the present invention, which includes but is not limited to steps S100 to S400:

[0050] S100, according to the bus battery low-temperature heating test request, power on the target bus.

[0051] In some embodiments, refer to Figure 4 the power-on process schematic diagram shown.

[0052] In this embodiment, by closing the handbrake switch, the constant-fire circuit of the whole vehicle is powered on. After the constant-fire circuit is powered on, the rocker switch is closed. At this time, the high-side drive relay and the delay relay of the BMS battery management subsystem are closed, and the switch-fire circuit of the whole vehicle is powered on. At the same time, the vehicle domain controller performs self-check. If the VCU self-check fails, a fault prompt is reported. Close the key On signal, and if the VCU self-check passes, at this time, the vehicle domain controller sends a command to close the main negative relay to the BMS battery management subsystem. After receiving the main negative relay closing command, the BMS battery management subsystem closes the main negative relay and at the same time feeds back the main negative relay closing state to the vehicle domain controller.

[0053] After receiving the main negative relay state feedback from the BMS, the vehicle domain controller sends a power-on request to the control assembly. After receiving the command, the control assembly first performs pre-charging. The pre-charging needs to meet the conditions: (1) The high-voltage self-check of the control assembly is correct; (2) The voltage difference between the total battery voltage and the pre-charge capacitor voltage meets the power-on requirements. After the control assembly completes the pre-charging, it disconnects the pre-charge relay and closes the main relay, and the whole vehicle goes on high voltage, and the DCDC starts to work.

[0054] S200, obtain the battery temperature and the vehicle operation state of the target bus, judge the battery temperature based on the temperature range, and obtain at least one judgment result of needing heating and not needing heating. The vehicle operation state includes one of the stationary state and the charging state.

[0055] S300, when the judgment result is that heating is required, determine the heating gear and the target temperature according to the temperature range where the battery temperature is located.

[0056] In some embodiments, refer to Figure 5 the flowchart of the test power system control strategy shown. After the bus is powered on, the BMS sends the collected battery temperature to the VCU. When the vehicle is in a stationary state or in a charging state, the VCU determines whether the battery needs to be heated based on the battery temperature. The temperature is judged in three intervals: (1) the battery temperature is less than or equal to -30°C; (2) the battery temperature is greater than -30°C and less than or equal to -15°C; (3) the battery temperature is greater than -15°C and less than 0°C. When the battery is in these three temperature intervals, the VCU determines that the battery needs to be quickly heated and sends the self-heating gear and the battery temperature to the control assembly. The motor module of the control assembly calculates the pulse current frequency and amplitude and sends the IGBT switch combination frequency, time, and on-off combination in the three-phase circuit to generate an over-pulse current, which acts on the battery. The battery heating temperature rises.

[0057] S400, heat the target battery according to the heating gear until the target temperature.

[0058] In some embodiments, when the vehicle needs to be driven and the battery temperature is greater than -5°C, the heating stops. When the battery temperature rises to greater than 0°C, the battery stops heating.

[0059] Figure 6 is the diagram of the bus battery low-temperature heating test analysis device according to the embodiment of the present invention. The device includes a first module 610, a second module 620, a third module 630, and a fourth module 640.

[0060] Among them, the first module is used to power on the entire vehicle of the target bus according to the bus battery low-temperature heating test request; the second module is used to obtain the battery temperature and the vehicle operation state of the target bus, judge the battery temperature based on the temperature interval, and obtain at least one judgment result of heating required and heating not required. The vehicle operation state includes one of a stationary state and a charging state; the third module is used to determine the heating gear and the target temperature according to the temperature interval where the battery temperature is located when the judgment result is that heating is required; the fourth module is used to heat the target battery according to the heating gear until the target temperature.

[0061] Exemplarily, with the cooperation of the first module in the device, the embodiment device can implement any one of the foregoing bus battery low-temperature heating test methods, that is, according to the bus battery low-temperature heating test request, power on the target bus on the whole vehicle; obtain the battery temperature and the vehicle operation state of the target bus, judge the battery temperature based on the temperature range, and obtain at least one judgment result of heating required and heating not required. The vehicle operation state includes one of a stationary state and a charging state; when the judgment result is that heating is required, determine the heating gear and the target temperature according to the temperature range where the battery temperature is located; heat the target battery according to the heating gear until the target temperature. The beneficial effects of the present invention are as follows: Through the vehicle domain controller, the control assembly, and the battery management system BMS, the acquisition of the real battery state, vehicle state, and motor state is realized, and the controllable low-temperature test environment can perform the power-on and power-off control of the vehicle; it can power on the vehicle in an extremely low-temperature environment, control the turn-off combination of the drive circuit IGBT, and realize the rapid heating of the power battery of the vehicle in an extremely low-temperature environment; the test method of self-heating of the test battery is realized through command power-on and heating.

[0062] An embodiment of the present invention also provides an electronic device, which includes a processor and a memory;

[0063] The memory stores a program;

[0064] The processor executes the program to execute the foregoing bus battery low-temperature heating test method; this electronic device has the function of carrying and running the software system for the bus battery low-temperature heating test provided by the embodiment of the present invention. For example, a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or communicating with charged particle tools or other imaging devices, etc.

[0065] An embodiment of the present invention also provides a computer-readable storage medium, and the storage medium stores a program, and the program is executed by the processor to implement the bus battery low-temperature heating test method as described above.

[0066] In some alternative embodiments, the functions / operations mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the functions / operations involved, two consecutive blocks shown may actually be executed substantially simultaneously or the blocks can sometimes be executed in the reverse order. In addition, the embodiments presented and described in the flowcharts of the present invention are provided by way of example for the purpose of providing a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logical flows presented herein. Alternative embodiments are contemplated, where the order of various operations is changed and where sub-operations described as part of a larger operation are executed independently.

[0067] An embodiment of the present invention also discloses a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of a computer device can read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the foregoing bus battery low-temperature heating test method.

[0068] In addition, although the present invention has been described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the functions and / or features may be integrated in a single physical device and / or software module, or one or more functions and / or features may be implemented in separate physical devices or software modules. It can also be understood that a detailed discussion of the actual implementation of each module is not necessary for understanding the present invention. More precisely, considering the attributes, functions and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the modules will be understood within the ordinary skills of an engineer. Therefore, those skilled in the art can implement the present invention as set forth in the claims without undue experimentation. It can also be understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0069] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0070] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definitional sequence of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device. As used in this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

[0071] More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection part (electronic device) having one or more wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other suitable processing as necessary, and then stored in a computer memory.

[0072] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0073] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0075] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A low-temperature heating test system for bus batteries, characterized in that, Including: A vehicle domain controller, a control assembly, and a BMS battery management subsystem, which are connected to each other pairwise through a CAN bus; The BMS battery management subsystem is connected to a battery box through a high-voltage box, and the BMS battery management subsystem and the high-voltage box constitute a high-voltage part; The vehicle domain controller is connected to a VCU simulation platform, a low-voltage distribution box, the BMS battery management subsystem, and the high-voltage part; The control assembly is connected to the low-voltage distribution box, and the low-voltage distribution box is used to power on and wake up the vehicle domain controller and the control assembly.

2. The bus battery low-temperature heating test system according to claim 1, wherein, The control assembly is respectively connected to a drive motor, an MCU simulation platform, the high-voltage box, a storage battery, a water pump, and a fan; the control assembly is connected to the MCU simulation platform through a CAN bus, connected to the storage battery, the water pump, and the fan through a low-voltage wire, connected to the high-voltage box through a high-voltage wire, and connected to the drive motor through a high-voltage wire and a signal wire; the control assembly also integrates a drive motor control module, a DC / DC module, a DC / AC oil pump control module, and a DC / AC air pump control module.

3. The bus battery low-temperature heating test system according to claim 2, wherein The low-voltage distribution box is respectively connected to the vehicle domain controller, the storage battery, the water pump, and the fan through low-voltage wires.

4. A method for testing low-temperature heating of a bus battery, which is used for the system according to any one of claims 1-3, characterized in that, Including: According to the low-temperature heating test request of the bus battery, power on the target bus; Obtain the battery temperature and the vehicle operation state of the target bus, judge the battery temperature based on a temperature range, and obtain at least one judgment result of needing heating and not needing heating. The vehicle operation state includes one of a stationary state and a charging state; When the judgment result is that heating is needed, determine the heating gear and the target temperature according to the temperature range where the battery temperature is located; Heat the target battery according to the heating gear until the target temperature.

5. The method for testing the low-temperature heating of a passenger car battery according to claim 4, characterized in that The step of powering on the target bus according to the low-temperature heating test request of the bus battery includes: Power on the normal-fire circuit of the target vehicle; After powering on the normal-fire circuit, close the toggle switch, and through the high-side drive relay closing and the delay relay closing of the BMS battery management subsystem, power on the switch-fire circuit of the whole vehicle. At the same time, the vehicle domain controller performs self-check. If the VCU simulation platform fails, a fault prompt is given. Otherwise, the key-on signal is closed, and the VCU simulation platform passes the self-check and sends a main negative relay closing instruction to the BMS battery management subsystem; After receiving the main negative relay closing instruction, close the main negative relay, and at the same time feedback the main negative relay closing state to the vehicle domain controller. After receiving the main negative relay state feedback from the BMS battery management subsystem through the vehicle domain controller, send a power-on request to the control assembly; After receiving the instruction, the control assembly first performs pre-charging. After the control assembly completes pre-charging, it disconnects the pre-charging relay, closes the main relay, powers on the high voltage of the whole vehicle, and the DCDC starts to work. The conditions for pre-charging include that the high-voltage self-check of the control assembly is correct and the voltage difference between the total voltage of the target battery and the pre-charge capacitor voltage meets the power-on requirements.

6. The method for testing low-temperature heating of a bus battery according to claim 5, characterized in that, Obtain the battery temperature and the vehicle operating state of the target bus, and judge the battery temperature based on the temperature range to obtain at least one judgment result of needing heating and not needing heating: After the bus is powered on, obtain the battery temperature and the vehicle operating state of the target battery; When the battery temperature is in one of the first temperature range, the second temperature range and the third temperature range, a heating judgment result is obtained, where the first temperature range is less than or equal to -30°C, the second temperature range is greater than -30°C and less than or equal to -15°C, and the third temperature range is greater than -15°C and the battery temperature is less than 0°C.

7. The method for testing low-temperature heating of a bus battery according to claim 6, wherein The obtaining the battery temperature and the vehicle operating state of the target bus, and judging the battery temperature based on the temperature range to obtain at least one judgment result of needing heating and not needing heating includes: Calculate the pulse current frequency and amplitude according to the heating judgment result, determine the IGBT switch combination frequency and time in the three-phase circuit according to the pulse current frequency and amplitude, and generate a pulse current through the IGBT switch combination frequency and time to act on the target battery until the target temperature; wherein, when the target vehicle needs to be driven and the target temperature is greater than -5°C, stop heating, or when the target battery temperature is greater than 0°C, stop heating.

8. A low-temperature heating test device for a bus battery, characterized in that, Includes: The first module is used to power on the whole vehicle of the target bus according to the low-temperature heating test request of the bus battery; The second module is used to obtain the battery temperature and the vehicle operating state of the target bus, and judge the battery temperature based on the temperature range to obtain at least one judgment result of needing heating and not needing heating, and the vehicle operating state includes one of a stationary state and a charging state; The third module is used to determine the heating gear and the target temperature according to the temperature range where the battery temperature is located when the judgment result is that heating is needed; The fourth module is used to heat the target battery until the target temperature according to the heating gear.

9. An electronic device, characterized in that, Includes a processor and a memory; The memory is used to store programs; The processor executes the program to implement the low-temperature heating test method for the bus battery according to any one of claims 4-7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a program, and the program is executed by the processor to implement the low-temperature heating test method for the bus battery according to any one of claims 4-7.

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