Vehicle and thermal management system thereof

Abstract

The utility model is suitable for the technical field of automobiles, and provides a vehicle and a thermal management system thereof, and the system comprises a thermal management module which is connected with a low-voltage power distribution module and is configured to output a load power supply request and / or a load power-off request to the low-voltage power distribution module according to a thermal management demand; the low-voltage power distribution module is connected with a plurality of low-voltage loads and is configured to conduct a power supply path of the low-voltage load corresponding to the load power supply request and disconnect the power supply path of the low-voltage load corresponding to the load power-off request, a low-voltage load which needs to work and a low-voltage load which does not need to work are determined based on a thermal management module according to thermal management requirements, a power supply access of the low-voltage load which does not need to work is disconnected through a low-voltage power distribution module, and only the low-voltage load which needs to work is supplied with power; therefore, the power supply consumption of the low-voltage load in the non-working state can be reduced, and the overall energy consumption of the vehicle is further reduced.

Description

Technical Field

[0001] This application belongs to the technical field of electric vehicle systems, and particularly relates to a current control method, device, energy storage valve controller vehicle and its thermal management system for a grid-connected system. Background Art

[0002] The thermal management system of a vehicle starts from the perspective of the whole vehicle, coordinates the relevant energy matching, optimization and control of components and subsystems such as the vehicle's generator, air conditioner, power battery and motor, so as to solve the heat-related problems of the whole vehicle, enable each module to work in a suitable temperature range, and improve the economy, power performance and safety of the whole vehicle.

[0003] The current vehicle thermal management system uses centralized power distribution for each low-voltage load and can only power on or off simultaneously, resulting in the fact that low-voltage loads in the non-working state will also consume energy, causing unnecessary low-voltage load energy consumption. Summary of the Invention

[0004] In view of this, the embodiments of this application provide a vehicle and its thermal management system to solve the problem that the current thermal management system cannot individually implement power supply control for each low-voltage load.

[0005] In a first aspect, the embodiments of this application provide a vehicle thermal management system, including:

[0006] A thermal management module, connected to the low-voltage power distribution module, configured to output a load power supply request and / or a load power-off request to the low-voltage power distribution module according to the thermal management requirements; wherein, the load power supply request is used to request power supply for working low-voltage loads, and the load power-off request is used to request disconnecting the power supply path of non-working low-voltage loads;

[0007] A low-voltage power distribution module, connected to multiple low-voltage loads respectively, configured to conduct the power supply path of the low-voltage load corresponding to the load power supply request, and disconnect the power supply path of the low-voltage load corresponding to the load power-off request.

[0008] In the embodiments of this application, based on the thermal management module determining the low-voltage loads that need to work and the low-voltage loads that do not need to work according to the thermal management requirements, for the low-voltage loads that do not need to work, the power supply path is disconnected through the low-voltage power distribution module, and only the low-voltage loads that need to work are powered, so as to reduce the power supply consumption of these non-working low-voltage loads and further reduce the overall energy consumption of the vehicle.

[0009] In an optional implementation manner of the first aspect, the vehicle thermal management system further includes a fault detection module;

[0010] The fault detection module is connected to the low-voltage power distribution module and is configured to detect the working states of each low-voltage load, and output a load power-off request to the low-voltage power distribution module when a fault occurs in the low-voltage load.

[0011] In the embodiment of the present application, after detecting a short circuit or an open circuit of a low-voltage load, a load power-off request for the low-voltage load can be output to the low-voltage power distribution module, so as to disconnect the power supply path of the faulty low-voltage load through the low-voltage power distribution module, thereby reducing the spread of short-circuit and open-circuit faults, effectively achieving fault isolation, and further being able to effectively improve the stability and safety of the load operation.

[0012] In one implementation manner of the first aspect, the low-voltage power distribution module includes a switch array, the switch array includes a plurality of switches, and each switch is connected to a low-voltage load.

[0013] In one implementation manner of the first aspect, the above-mentioned switch is a load switch.

[0014] In one implementation manner of the first aspect, the thermal management module is communicatively connected to the low-voltage power distribution module through a CAN bus.

[0015] In one implementation manner of the first aspect, the fault detection module is communicatively connected to the low-voltage load through a LIN bus.

[0016] In one implementation manner of the first aspect, the fault detection module is communicatively connected to the low-voltage power distribution module through a CAN bus.

[0017] In one implementation manner of the first aspect, the low-voltage load includes at least one of an electric fan, a battery water pump, a motor water pump, a heater water pump, an OBC / DCDC water pump, a positive temperature coefficient thermistor, a compressor, a three-way valve, a five-way valve, a six-way valve, and an electronic expansion valve.

[0018] In one implementation manner of the first aspect, the fault detection module includes electrical parameter sensors distributed in each low-voltage load, and the electrical parameter sensors are configured to detect the working voltage and / or working current of the low-voltage load.

[0019] In a second aspect, the embodiment of the present application provides a vehicle, and the vehicle includes the vehicle thermal management system mentioned in the first aspect and its various implementation manners.

[0020] For the vehicle in the embodiment of the present application, through its vehicle thermal management system, it can also determine the low-voltage loads that need to work and the low-voltage loads that do not need to work according to the thermal management requirements. For the low-voltage loads that do not need to work, the power supply path is disconnected through the low-voltage power distribution module, and only the low-voltage loads that need to work are powered. In this way, the power supply consumption of these non-working low-voltage loads can be reduced, and thus the overall energy consumption of the vehicle can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 FIG. [ID] is a schematic structural diagram of a vehicle thermal management system provided by an embodiment of the present application;

[0023] Figure 2 FIG. [ID] is a schematic structural diagram of another vehicle thermal management system provided by an embodiment of the present application;

[0024] Figure 3 FIG. [ID] is a schematic structural diagram of another vehicle thermal management system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will describe in detail the embodiments of the technical solutions of the present application in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0026] It should be noted that unless otherwise specified, all technical terms used in the embodiments of the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The technical terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0027] In the description of the embodiments of the present application, the technical terms "include", "comprise", "have" and any variations thereof all mean "including but not limited to", unless otherwise particularly emphasized in other ways.

[0028] In the description of the embodiments of the present application, unless otherwise specified, the technical term "plural" means two or more than two, and the technical terms "at least one", "one or more" mean one, two or more than two.

[0029] The technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features.

[0030] The technical term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this text, the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0031] When the term "embodiment" is mentioned in the description of the embodiments of this application, it means that the specific features, structures, or characteristics described in combination with the embodiments can be included in at least one embodiment of this application. The occurrence of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0032] The vehicle's thermal management system starts from the perspective of the entire vehicle. By coordinating the energy matching, optimization, and control of relevant components and subsystems such as the vehicle's generator, air conditioner, and power battery, it solves the thermal-related problems of the entire vehicle, enabling each module to operate within a suitable temperature range, thereby improving the economy, power performance, and safety of the entire vehicle.

[0033] According to the division of the entire vehicle's space area, the thermal management system mainly includes three major parts: power system thermal management, cabin air-conditioning thermal management, and drive control thermal management. In addition, the thermal management system can also perform thermal management on the on-board charger (OBC) and on-board DC-DC converter (DCDC converter) of the power battery, which is called OBC / DCDC thermal management.

[0034] Among them, the thermal management of the power system mainly targets the thermal management of the power battery and its engine system. The thermal management of the power system can include a cooling mode and a heating mode. The power battery is the main energy source of new energy vehicles and plays a decisive role in aspects such as the overall vehicle's endurance and safety. Its safe operating temperature is generally between 15°C and 40°C. When the battery operates in a low-temperature environment, its charge and discharge efficiency is relatively low. When it operates in a high-temperature environment, the battery's cycle life will be shortened, and safety accidents such as battery combustion and explosion may even occur due to thermal runaway. Therefore, it is necessary to dynamically adjust the battery temperature so that it operates within a suitable temperature range, which can effectively ensure the battery performance of the power battery. Among them, the cooling mode is a working mode that reduces the temperature of the power battery through a cooling method when the temperature of the power battery is too high. The cooling methods adopted by the cooling mode include but are not limited to air cooling, water cooling, liquid cooling, heat pipe cooling, and direct cooling, etc. The heating mode is a working mode that heats the power battery based on heating requirements. The heating methods adopted by the heating mode include but are not limited to external heating methods and internal heating methods. Among them, the external heating method can be heated through methods such as heating films, positive temperature coefficient thermistors (Positive Temperature Coefficient, PTC), and liquid-cooled direct heating. The internal heating method can be heated through methods such as high-frequency pulse heating and heat generation by the battery internal resistance.

[0035] The thermal management of the cockpit air conditioner mainly targets the comfort of the cockpit and improves the user's riding experience. It is mainly the temperature adjustment of the cockpit air conditioner. The temperature adjustment of the cockpit air conditioner can also include a heating mode and a cooling mode. The cooling mode is a working mode that reduces the temperature inside the cockpit and can use but is not limited to refrigeration methods such as condensation heat release and evaporation heat absorption to cool the cockpit; the heating mode is a working mode that increases the temperature inside the cockpit and can adjust the temperature through positive temperature coefficient thermistors (Positive Temperature Coefficient, PTC), heat pump air conditioners, etc.

[0036] The thermal management of the drive system mainly targets the thermal management of the motor and its electronic control system. The motor and its electronic control system are the key to the energy output of new energy vehicles. During its operation, internal components such as coil resistors and other devices will generate heat, and the friction between mechanical parts will also generate heat, which easily causes the temperature of the motor and the electronic control system to be too high, affecting the operation stability and safety of the motor and its control system. Therefore, it is necessary to cool the drive system of the whole vehicle when the temperature is relatively high, and the cooling methods can include but are not limited to air cooling, liquid cooling, and oil cooling, etc.

[0037] In a specific application, the above thermal management system can achieve thermal management through relevant low-voltage loads. Since the energy consumption of low-voltage loads is relatively small, currently, centralized power distribution is adopted for the low-voltage loads in the thermal management system, that is, the low-voltage loads are powered on or off uniformly. In this way, the low-voltage loads in the non-working state will also consume energy, resulting in unnecessary energy consumption of the low-voltage loads.

[0038] In a specific application, the above low-voltage loads include, but are not limited to, electric fans, battery water pumps, motor water pumps, heater water pumps, OBC / DCDC water pumps, positive temperature coefficient thermistors, compressors, three-way valves, five-way valves, six-way valves, and electronic expansion valves (EXV), etc.

[0039] Based on this, the embodiments of the present application provide a vehicle and its thermal management system. The thermal management system includes a low-voltage power distribution module. The low-voltage power distribution module is electrically connected to multiple low-voltage loads respectively, and can select to conduct the corresponding low-voltage loads according to the thermal management power distribution requirements. Under the thermal management power distribution requirements, only the corresponding low-voltage loads are conducted, and the low-voltage loads that do not need to work are disconnected, which can effectively reduce the energy consumption of the low-voltage loads.

[0040] The following will describe in detail the current control method of the grid-connected system and the energy storage valve controller vehicle and its thermal management system provided by the embodiments of the present application with reference to the accompanying drawings:

[0041] Please refer to Figure 1 , Figure 1 which is a schematic architecture diagram of a vehicle thermal management system provided by an embodiment of the present application. As Figure 1 shown, the grid-connected system vehicle thermal management system 10 may include a thermal management module 100 and a low-voltage power distribution module 200. Among them, the thermal management module 100 may be connected to the low-voltage power distribution module 200, and the above low-voltage power distribution module 200 is electrically connected to the power-on of multiple low-voltage loads 210 respectively. Among them, the thermal management module 100 may output a load power supply request and a load power-off request to the low-voltage power distribution module 200 according to the thermal management requirements. The low-voltage power distribution module 200 may conduct the power supply path of the low-voltage load corresponding to the load power supply request and disconnect the power supply path of the low-voltage load corresponding to the load power-off request.

[0042] Among them, the load power supply request is used to request power supply for the working low-voltage loads, and the load power-off request is used to request disconnecting the power supply path of the non-working low-voltage loads.

[0043] In a specific application, the above low-voltage power distribution module 200 may include a power distribution controller to control the conduction and disconnection of each power supply path through the power distribution controller.

[0044] In a specific application, the above-mentioned thermal management module 100 includes a thermal management controller. The thermal management controller can determine which low-voltage loads for thermal management need to work and which do not according to the actual thermal management requirements. Here, the low-voltage loads that need to work are called working low-voltage loads, and the low-voltage loads that do not need to work are called non-working low-voltage loads. After the thermal management controller determines the working low-voltage loads and non-working low-voltage loads, it can send a load power supply request for the working low-voltage loads and a load power-off request for the non-working low-voltage loads to the power distribution controller.

[0045] In a specific application, the load power supply request and the load power-off request may include a load code and a switching instruction. Among them, the load code represents the codes of each low-voltage load. Each low-voltage load has a load code, and different loads have different load codes. The switching instruction is a control instruction for power-on or power-off. Specifically, the above-mentioned switching instruction can be a high or low level signal. For example, the switching instruction in the above-mentioned load power supply request is a high level signal, and the switching instruction in the load power-off request is a low level signal. Or, the switching instruction in the load power supply request can be a low level signal, and at this time, the switching instruction in the load power-off request can be a high level signal. The specific implementation can be selected based on the actual circuit.

[0046] In a specific application, the above-mentioned power distribution controller can control the conduction and disconnection of each power supply path. The power distribution controller may include multiple low-voltage load connection ports. Based on these low-voltage load connection ports, low-voltage loads are connected, and the power distribution controller can determine the load numbers of each connected low-voltage load, and then determine the low-voltage loads corresponding to each power supply path. After receiving the load power supply request and the load power-off request transmitted by the thermal management module, it can determine the power supply paths corresponding to the low-voltage loads corresponding to the load codes in the load power supply request and the load power-off request, and then realize the conduction and disconnection of the power supply paths based on the high and low level signals of the switching instruction.

[0047] Among them, the thermal management requirements may include power system thermal management requirements, cockpit air conditioning thermal management requirements, drive control thermal management requirements, and OBC / DCDC thermal management requirements.

[0048] For different working conditions, the vehicle will have different thermal management requirements. The thermal management module 100 in the thermal management system 10 can determine which low-voltage loads need to run to meet the thermal management requirements according to the thermal management requirements. These low-voltage loads are the low-voltage loads corresponding to the load power supply request, and the other low-voltage loads that do not need to run are the low-voltage loads corresponding to the load power-off request.

[0049] Exemplarily, the following is an exemplary description with specific working conditions:

[0050] Working condition 1: The vehicle is in a dormant state.

[0051] After the vehicle enters the sleep state, for cases with thermal management requirements, the domain controller usually wakes up the thermal management system (Temperature Control Unit, TCU). The thermal management module 100 in the thermal management system determines the low-voltage loads corresponding to the thermal management requirements. For example, in the sleep state, when the battery overheats, it can be determined that the thermal management requirement is the power system thermal management requirement, specifically the requirement to cool the battery temperature. At this time, the domain controller can wake up the TCU, and then the TCU determines that the corresponding low-voltage load is the battery water pump, and sends a load power supply request for the battery water pump to the low-voltage power distribution module 200. The low-voltage power distribution module 200 conducts the power supply path of the battery water pump. At the same time, the TCU can also send a load power-off request for other low-voltage loads except the battery water pump to the low-voltage power distribution module 200, and the low-voltage power distribution module 200 disconnects the power supply paths of the low-voltage loads except the battery water pump.

[0052] It can be understood that the above thermal management requirement for reducing the battery temperature is only an example. In the sleep state, the thermal management requirements of the vehicle may be one or a combination of power system thermal management requirements and drive system thermal management requirements.

[0053] Condition 2: The vehicle is in a driving state.

[0054] Under the driving condition, there will be cockpit thermal management requirements in the vehicle cockpit, such as the requirement to cool or heat the cockpit. At the same time, the control system of the motor also needs thermal management, that is, there will also be drive system thermal management requirements, and the working temperature of the power battery also needs to be adjusted. Therefore, there will also be battery thermal management requirements. Therefore, during the driving process of the vehicle, the TCU determines the low-voltage loads that need to operate among multiple thermal management requirements, and determines the non-working low-voltage loads that do not need to operate. Then it sends a load power supply request for the low-voltage loads that need to operate (referred to as working low-voltage loads) to the low-voltage power distribution module, and sends a load power-off request for the non-working low-voltage loads to the low-voltage power distribution module. The low-voltage power distribution module conducts the power supply paths of the working low-voltage loads and disconnects the power supply paths of the non-working low-voltage loads.

[0055] Condition 3: The vehicle is in a charging state.

[0056] In the charging situation, since the OBC / DCDC water pump needs to work continuously, the TCU can determine the OBC / DCDC water pump as the working low-voltage load. The thermal management sends a load power supply request for the OBC / DCDC water pump to the low-voltage power distribution module 200, and the low-voltage power distribution module 200 conducts the power supply path of the OBC / DCDC water pump.

[0057] It can be understood that the TCU of the thermal management system determines the thermal management requirements according to the working conditions, and determines the low-voltage loads that need to work and the low-voltage loads that do not need to work according to the thermal management requirements, which can be executed by the TCU of the thermal management system during thermal management without adding other control modules to achieve.

[0058] As can be seen from the above, for different working conditions, the vehicle will have different thermal management requirements. Different thermal management requirements need to start different low-voltage loads to achieve, and there will also be some low-voltage loads that do not need to operate under this working condition. The current thermal management system will also supply power to the low-voltage loads that do not need to operate, but will not control them to operate. However, there will still be some energy losses even when the power is supplied but not working. The vehicle thermal management system provided by the embodiments of the present application can determine the low-voltage loads that need to work and the low-voltage loads that do not need to work based on the thermal management module 100 according to the thermal management requirements. For the low-voltage loads that do not need to work, the low-voltage power distribution module 200 disconnects their power supply paths, and only supplies power to the low-voltage loads that need to work, so that the power supply consumption of these non-working low-voltage loads can be reduced, thereby reducing the overall energy consumption of the vehicle.

[0059] In another embodiment of the present application, please refer to Figure 2 , Figure 2 which shows a schematic structural diagram of a thermal management system provided by an embodiment of the present application. As Figure 2 shown, the above thermal management system 10 may further include a fault detection module 300. The fault detection module 300 is connected to the above low-voltage power distribution module 200. Among them, the fault detection module 300 is configured to detect the working states of each low-voltage load, and in the case of a fault in the low-voltage load, output a load power-off request to the above low-voltage power distribution module 200, and the low-voltage power distribution module 200 disconnects the low-voltage load corresponding to the load power-off request.

[0060] In a specific application, the above fault detection module 300 can detect the working voltage and / or working current of each low-voltage load through electrical parameter sensors, such as voltage sensors, current sensors, etc., and feedback the voltage values and / or current values detected by a plurality of distributed electrical parameter sensors to the fault detection module 300 through the LIN bus, so as to detect whether the working voltage of each low-voltage load is normal through the fault detection module 300, thereby determining whether each low-voltage load has a short circuit / open circuit fault.

[0061] In a specific application, the above-mentioned fault detection module 300 can specifically detect whether there are short-circuit or open-circuit faults in the above-mentioned low-voltage load. After detecting a short-circuit or open-circuit of the low-voltage load, a load power-off request for the low-voltage load can be output to the low-voltage power distribution module 200, so as to disconnect the power supply path of the faulty low-voltage load through the low-voltage power distribution module 200, thereby reducing the spread of short-circuit and open-circuit faults, effectively realizing fault isolation, and further effectively improving the stability and safety of load operation.

[0062] In another embodiment of the present application, the above-mentioned thermal management module 100 and the above-mentioned low-voltage power distribution module 200 are communicatively connected through a CAN bus, and the above-mentioned load power supply request and load power-off request are transmitted through the vehicle's CAN bus, improving the convenience of transmission.

[0063] In another embodiment of the present application, the above-mentioned fault detection module 300 can specifically be connected to the low-voltage load through a LIN bus to detect whether the low-voltage load has a fault, and the fault detection module 300 can be communicatively connected to the above-mentioned low-voltage power distribution module 200 through the above-mentioned CAN bus.

[0064] In another embodiment of the present application, please refer to Figure 3 , Figure 3 which shows a schematic structural diagram of a thermal management system provided by an embodiment of the present application. As Figure 3 shown, the above-mentioned low-voltage power distribution module 200 specifically includes a switch array 220, and the switch array 220 includes a plurality of switches 221, and each switch 221 is connected to a low-voltage load 210.

[0065] The low-voltage power distribution module 200 can determine the corresponding low-voltage load according to the load power supply request, and turn on the switch 221 corresponding to the low-voltage load, thereby turning on the power supply path of the low-voltage load corresponding to the load power supply request. The low-voltage power distribution module 200 can also determine the corresponding low-voltage load according to the load power-off request, and turn off the switch corresponding to the low-voltage load, thereby turning off the power supply path of the low-voltage load corresponding to the load power-off request, so as to realize the individual power-on and power-off of the low-voltage load.

[0066] In a specific application, the above-mentioned switch 221 can specifically use a power switch. For example, a load switch (LoadSwitch).

[0067] An embodiment of the present application also provides a vehicle, and the vehicle includes the vehicle thermal management system described in any one of the above embodiments.

[0068] Those skilled in the art can clearly understand that, for the convenience and conciseness of description, only the above division of each functional module / unit is used as an example. In actual applications, the above functions can be assigned to different functional modules / units as needed, that is, the internal structure of the control device is divided into different functional modules / units to complete all or part of the functions described above. Each functional module / unit in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional module / unit. In addition, the specific names of each functional module / unit are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working process of each unit in the above control device can refer to the corresponding process in the foregoing method embodiment and will not be elaborated herein.

[0069] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not described in detail or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0071] The above-described embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application and should all be included in the protection scope of the present application.

Claims

1. A vehicle thermal management system, characterized in that, Comprising: A thermal management module, connected to the low-voltage power distribution module, configured to output a load power supply request and / or a load power-off request to the low-voltage power distribution module according to thermal management requirements; wherein, the load power supply request is used to request power supply for the working low-voltage load, and the load power-off request is used to request disconnecting the power supply path of the non-working low-voltage load. A low-voltage power distribution module, connected to multiple low-voltage loads respectively, configured to conduct the power supply path of the low-voltage load corresponding to the load power supply request, and disconnect the power supply path of the low-voltage load corresponding to the load power-off request.

2. The vehicle thermal management system according to claim 1, wherein, The vehicle thermal management system further includes a fault detection module; The fault detection module is connected to the low-voltage power distribution module, configured to detect the working state of each low-voltage load, and output a load power-off request to the low-voltage power distribution module when a low-voltage load fails.

3. The vehicle thermal management system according to claim 1 or 2, characterized in that, The low-voltage power distribution module includes a switch array, and the switch array includes a plurality of switch devices, and each switch device is connected to a low-voltage load.

4. The vehicle thermal management system according to claim 3, characterized in that, The switch device is a load switch device.

5. The vehicle thermal management system according to any one of claims 1 to 4, characterized in that, The thermal management module and the low-voltage power distribution module are communicatively connected via a CAN bus.

6. The vehicle thermal management system according to claim 2, wherein, The fault detection module and the low-voltage load are communicatively connected via a LIN bus.

7. The vehicle thermal management system according to claim 2, characterized in that, The fault detection module and the low-voltage power distribution module are communicatively connected via a CAN bus.

8. The vehicle thermal management system according to any one of claims 1 to 6, characterized in that, The low-voltage load includes at least one of an electric fan, a battery water pump, a motor water pump, a heater water pump, an OBC / DCDC water pump, a positive temperature coefficient thermistor, a compressor, a three-way valve, a five-way valve, a six-way valve, and an electronic expansion valve.

9. The vehicle thermal management system according to claim 2, wherein The fault detection module includes electrical parameter sensors distributed in each low-voltage load, and the electrical parameter sensors are configured to detect the working voltage and / or working current of the low-voltage load.

10. A vehicle, characterized in that, The vehicle includes the vehicle thermal management system according to any one of claims 1 to 9.

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