Vehicle thermal management system based on CAN communication and vehicle

Abstract

The utility model relates to the technical field of vehicle thermal management, and provides a vehicle thermal management system based on CAN communication and a vehicle, comprising an external CAN communication device, a thermal management controller, a battery management system and a battery cooling assembly, the external CAN communication device is connected to a whole vehicle CAN network through a vehicle OBD interface and is in communication connection with the thermal management controller. The battery management system is in communication connection with the thermal management controller through a whole vehicle CAN network. And the thermal management controller is electrically connected with the battery cooling assembly. According to the utility model, an instruction is sent to the heat management controller through the external CAN communication equipment, and the heat management controller can simultaneously receive and process instructions from the external CAN communication equipment and the battery management system, so that the heat management system does not only depend on the instruction of the battery management system any more, thereby not only ensuring automatic control, but also providing manual intervention capability; and the thermal management working efficiency and flexibility are comprehensively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle thermal management, and more specifically, to a vehicle thermal management system and a vehicle based on CAN communication. Background Art

[0002] In the field of modern electric vehicle technology, the vehicle thermal management system is a key component to ensure vehicle performance and safety. With the popularization of electric vehicles and the development of battery technology, the demand for battery cooling systems is increasing, especially under extreme climate conditions. Overheating of the battery may affect its performance and lifespan, and even cause safety problems, while overcooling may lead to a decline in battery performance. Therefore, effective vehicle thermal management is crucial for maintaining the stability and reliability of electric vehicles.

[0003] Currently, vehicles generally adopt the road test technical route for battery cooling, that is, in summer, through vehicle dynamic testing, after the battery temperature rises, the battery management system (BMS, Battery Management System) sends a working instruction to the thermal management control system (TMS, Thermal Management System) to start the water pump to remove the air in the pipeline, and secondary liquid filling is carried out after the test drive ends. In winter or low-temperature environments, the water pump forced start technology is usually adopted, by directly connecting the water pump plug to the standby power supply plug to force the water pump to rotate to remove the air, and then liquid filling is carried out. However, the above methods need to respond after the battery temperature rises, which is not only inefficient but also unable to effectively cool the battery in the parked state, limiting the flexibility of the system. Summary of the Utility Model

[0004] The utility model aims to overcome the defects of low efficiency and flexibility existing in the existing vehicle thermal management technology, and provides a vehicle thermal management system and a vehicle based on CAN communication.

[0005] To solve the above technical problems, the technical solution of the utility model is as follows:

[0006] In a first aspect, the utility model proposes a vehicle thermal management system based on CAN communication, including: an external CAN communication device, a thermal management controller, a battery management system, and a battery cooling component.

[0007] The external CAN communication device accesses the vehicle CAN network through the vehicle OBD interface and is communicatively connected to the thermal management controller.

[0008] The battery management system is communicatively connected to the thermal management controller through the vehicle CAN network.

[0009] The thermal management controller is electrically connected to the battery cooling component.

[0010] In this technical solution, an external CAN communication device accesses the vehicle's CAN network through the vehicle's OBD interface. When it is necessary to operate the battery cooling system, the staff inserts the external CAN communication device into the vehicle's OBD interface. The external CAN communication device then establishes a communication connection with the thermal management controller and can send working instructions to the thermal management controller. At the same time, the battery management system also maintains a communication connection with the thermal management controller through the vehicle's CAN network and sends working instructions to the thermal management controller according to the monitored battery status. The thermal management controller controls the working status of the battery cooling components according to the received working instructions.

[0011] As a preferred technical solution, the battery cooling component includes a fan.

[0012] The fan is installed at the air inlet or outlet of the battery box and is used for forced air cooling of the battery box.

[0013] As a preferred technical solution, the battery cooling component includes a water pump and a water pump relay.

[0014] The water pump is used to circulate and deliver coolant to the battery box.

[0015] The water pump relay is used to control the operation of the water pump.

[0016] As a preferred technical solution, the water pump is connected to the battery box through a cooling circuit.

[0017] The cooling circuit includes a cooling plate, a first pipe, and a second pipe.

[0018] The cold plate is arranged on the surface of the battery box, and a third pipe is provided inside the cold plate.

[0019] The water inlet of the water pump is connected to the liquid storage bin of the battery box, one end of the first pipe is connected to the water outlet of the water pump, and the other end is connected to the water inlet of the third pipe.

[0020] One end of the second pipe is connected to the water outlet of the third pipe, and the other end is connected to the liquid storage bin of the battery box.

[0021] As a preferred technical solution, the battery cooling component further includes a compressor, a compressor controller, and a compressor relay.

[0022] The compressor is used to compress the cooling medium in the cooling circuit to reduce the temperature of the coolant.

[0023] The compressor controller is used to control the operation of the compressor.

[0024] The compressor relay is used to control the operation of the compressor controller.

[0025] As a preferred technical solution, the vehicle thermal management system further includes a sensor assembly, and the sensor assembly is electrically connected to the thermal management controller.

[0026] As a preferred technical solution, the sensor assembly includes a liquid level sensor, an outlet water temperature sensor, an inlet water temperature sensor, a high-pressure pressure sensor, a low-pressure pressure sensor, and a compressor exhaust humidity sensor.

[0027] The liquid level sensor is arranged in the liquid storage bin of the battery box and is used for detecting the liquid level in the liquid storage bin.

[0028] The outlet water temperature sensor is arranged at the outlet of the third pipeline and is used for detecting the temperature of the coolant flowing out of the third pipeline.

[0029] The inlet water temperature sensor is arranged at the inlet of the third pipeline and is used for detecting the temperature of the coolant flowing into the third pipeline.

[0030] The high-pressure pressure sensor is arranged at the outlet of the compressor and is used for detecting the pressure of the cooling medium at the outlet of the compressor.

[0031] The low-pressure pressure sensor is arranged at the inlet of the compressor and is used for detecting the pressure of the cooling medium at the inlet of the compressor.

[0032] The compressor exhaust humidity sensor is arranged at the outlet of the compressor and is used for detecting the exhaust humidity of the compressor.

[0033] As a preferred technical solution, the vehicle thermal management system further includes a steering system controller; the steering system controller is used for collecting and sending vehicle steering state information to the thermal management controller through the vehicle CAN bus.

[0034] As a preferred technical solution, the vehicle thermal management system further includes a braking system controller; the braking system controller is used for collecting and sending vehicle braking state information to the thermal management controller through the vehicle CAN bus.

[0035] In a second aspect, the present invention further provides a vehicle, and the vehicle includes the CAN communication-based vehicle thermal management system in any of the above solutions.

[0036] Compared with the prior art, the beneficial effects of the technical solution of the present utility model are as follows: By introducing an external CAN communication device and connecting it to the thermal management controller, the present utility model effectively solves the problems of low efficiency and flexibility of the thermal management system in the prior art. The present utility model enables the thermal management system to no longer rely solely on the instructions of the battery management system, but can respond to the control requirements of external devices. This design greatly improves the flexibility of the system, making it convenient to operate in various special situations, such as when refueling or replenishing liquid, checking the function of the water cooling unit, forced cooling or shutdown for energy conservation. At the same time, since the thermal management controller can receive and process instructions from both the external CAN communication device and the battery management system simultaneously, the system can flexibly switch control modes according to actual needs, ensuring both automatic control during normal operation and the ability of manual intervention when necessary, thus comprehensively improving the working efficiency and adaptability of the vehicle thermal management system. Description of the Drawings

[0037] Figure 1 It is an architecture diagram of the vehicle thermal management system based on CAN communication provided in Embodiment 1.

[0038] Figure 2 It is a schematic diagram of the vehicle thermal management system based on CAN communication provided in Embodiment 2.

[0039] Figure 3 It is a working flowchart of the vehicle thermal management system based on CAN communication provided in Embodiment 3. Among them, external CAN communication device - 1, thermal management controller - 2, battery management system - 3, battery cooling component - 4, fan - 5, water pump - 6, water pump relay - 7, compressor - 8, compressor controller - 9, compressor relay - 10, liquid level sensor - 11, outlet water temperature sensor - 12, inlet water temperature sensor - 13, high - pressure pressure sensor - 14, low - pressure pressure sensor - 15, compressor exhaust humidity sensor - 16, steering system controller - 17, braking system controller - 18, vehicle OBD interface - 19, DC / DC converter - 20. Detailed Embodiments

[0040] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The ways described in the following exemplary embodiments do not represent all ways consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0041] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the", and "said" used in this application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0042] It should be understood that the "first", "second", and similar terms used in the specification and claims of this application do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantity limitation, but rather indicate the presence of at least one. Unless otherwise indicated, terms such as "front", "rear", "lower", and / or "upper" are for convenience of description only and are not limited to a particular position or spatial orientation. The terms "comprising" or "including" and the like are intended to mean that the elements or items appearing before "comprising" or "including" encompass the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this disclosure pertains. The terms used in the specification of this disclosure are for the purpose of describing specific embodiments only and are not intended to limit this disclosure.

[0044] The embodiments of this application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the features in the following embodiments may be combined with each other.

[0045] The technical solution of the present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0046] Embodiment 1

[0047] Refer to Figure 1 , an in-vehicle thermal management system based on CAN communication is proposed in the embodiment of this application, including:

[0048] An external CAN communication device 1, a thermal management controller 2, a battery management system 3, and a battery cooling component 4.

[0049] The external CAN communication device 1 accesses the vehicle CAN network through the vehicle OBD interface 19 and is communicatively connected to the thermal management controller 2.

[0050] The battery management system 3 is communicatively connected to the thermal management controller 2 via the vehicle CAN network.

[0051] The thermal management controller 2 is electrically connected to the battery cooling assembly 4.

[0052] In a specific implementation process, the external CAN communication device 1 is connected to the vehicle CAN network through the vehicle OBD interface 19. When an operation needs to be performed on the battery cooling system, the staff inserts the external CAN communication device 1 into the vehicle's OBD interface. The external CAN communication device 1 then establishes a communication connection with the thermal management controller 2 and can send a work instruction to the thermal management controller 2. At the same time, while monitoring the temperature status of the battery, the battery management system 3 also maintains a communication connection with the thermal management controller 2 via the vehicle CAN network and sends a work instruction to the thermal management controller 2 according to the monitored battery status. The thermal management controller 2 controls the working status of the battery cooling assembly 4 according to the received work instruction.

[0053] It can be understood that by introducing the external CAN communication device 1 and connecting it to the thermal management controller 2, the problems of low efficiency and flexibility of the thermal management system in the prior art are effectively solved. The utility model enables the thermal management system to no longer rely solely on the instructions of the battery management system 3, but can respond to the control requirements of external devices. This design greatly improves the flexibility of the system, enabling convenient operation in various special situations, such as when refueling or replenishing liquid, checking the function of the water cooling unit, forced cooling, or shutdown for energy conservation. At the same time, since the thermal management controller 2 can receive and process instructions from both the external CAN communication device 1 and the battery management system 3 simultaneously, the system can flexibly switch the control mode according to actual needs, ensuring both automatic control during normal operation and the ability of manual intervention when necessary, thereby comprehensively improving the working efficiency and adaptability of the vehicle thermal management system.

[0054] Embodiment 2

[0055] Refer to Figure 2 , this application embodiment makes improvements on the basis of the vehicle thermal management system based on CAN communication proposed in Embodiment 1.

[0056] In this embodiment, when the thermal management controller 2 recognizes that work instructions are sent simultaneously by the external CAN communication device 1 and the battery management system 3, it preferentially responds to the work instructions sent by the CAN communication device.

[0057] As an exemplary illustration, when the working mode control switch is pressed, the external CAN communication device 1 will send a frame of interaction message to the thermal management controller 2, which can control the thermal management controller 2 to further control the battery cooling component 4 to work. The thermal management controller 2 determines the device sending the working instruction through the message. When the thermal management controller 2 recognizes that both the external CAN communication device 1 and the battery management system 3 send working instructions, it preferentially responds to the working instruction sent by the CAN communication device and feeds back the working mode according to the working instruction sent by the battery management system 3. For example, if the working instruction of the CAN device is self-circulation and the working instruction of the battery management system 3 is refrigeration, the thermal management controller 2 responds to the self-circulation instruction of the CAN communication device, and the fed-back working mode is the refrigeration of the battery management system 3. When the thermal management controller 2 recognizes that only the battery management system 3 sends a working instruction, the thermal management controller 2 executes the working instruction of the battery management system 3 and feeds back.

[0058] In this embodiment, the battery cooling component 4 includes a fan 5. The fan 5 is installed at the air inlet or outlet of the battery box and is used for forced air cooling of the battery box.

[0059] In the specific implementation process, the thermal management controller 2 controls the start and speed of the fan 5 according to the instruction of the external CAN communication device 1. When the battery needs to be cooled, the fan 5 starts to work, and forced ventilation is carried out at the air inlet or outlet of the battery box to accelerate air circulation.

[0060] It can be understood that the design of the fan 5 can quickly respond to the cooling demand, is especially suitable for mild cooling scenarios, can effectively reduce the battery temperature, and has low energy consumption at the same time, improving the energy efficiency ratio of the system.

[0061] In this embodiment, the battery cooling component 4 includes a water pump 6 and a water pump relay 7.

[0062] The water pump 6 is used to circulate and transport the coolant to the battery box.

[0063] The water pump relay 7 is used to control the operation of the water pump 6.

[0064] In the specific implementation process, after the thermal management controller 2 receives the circulation instruction from the external CAN communication device 1, it controls the water pump relay 7 to close and starts the water pump 6. The water pump 6 starts to work, circulates and transports the coolant to the battery box to achieve liquid cooling and heat dissipation.

[0065] It can be understood that the liquid cooling system has higher cooling efficiency than the air cooling system, can cool the battery pack more evenly, effectively prevent local overheating, and improve the service life and safety of the battery.

[0066] In this embodiment, the water pump 6 is connected to the battery box through a cooling circuit.

[0067] The cooling circuit includes a cooling plate, a first pipe, and a second pipe.

[0068] The cold plate is disposed on the surface of the battery box, and a third pipe is provided in the cold plate.

[0069] The water inlet of the water pump 6 is connected to the liquid storage bin of the battery box, one end of the first pipe is connected to the water outlet of the water pump 6, and the other end is connected to the water inlet of the third pipe.

[0070] One end of the second pipe is connected to the water outlet of the third pipe, and the other end is connected to the liquid storage bin of the battery box.

[0071] In the specific implementation process, after the water pump 6 is started, the coolant is pumped out from the liquid storage bin through the water pump 6, enters the third pipe in the cold plate through the first pipe, and exchanges heat with the surface of the battery box. The cooled liquid returns to the liquid storage bin through the second pipe to form a closed-loop cycle.

[0072] In this embodiment, the battery cooling assembly 4 further includes a compressor 8, a compressor controller 9, and a compressor relay 10.

[0073] The compressor 8 is used to compress the cooling medium in the cooling circuit to reduce the temperature of the coolant.

[0074] The compressor controller 9 is used to control the operation of the compressor 8.

[0075] The compressor relay 10 is used to control the operation of the compressor controller 9.

[0076] In the specific implementation process, when stronger cooling is required, the thermal management controller 2 controls the compressor controller 9 to operate through the compressor relay 10, and starts the compressor 8. The compressor 8 compresses the cooling medium, reduces the temperature of the coolant, and provides stronger cooling capacity.

[0077] It can be understood that introducing the compressor 8 system greatly enhances the cooling capacity, enables the system to meet the cooling requirements under high-temperature environments or high-power working conditions, and ensures the safe operation of the battery under extreme conditions.

[0078] In this embodiment, the vehicle thermal management system further includes a sensor assembly, and the sensor assembly is electrically connected to the thermal management controller 2.

[0079] In this embodiment, the sensor assembly includes a liquid level sensor 11, an outlet water temperature sensor 12, an inlet water temperature sensor 13, a high-pressure pressure sensor 14, a low-pressure pressure sensor 15, and a compressor exhaust humidity sensor 16.

[0080] The liquid level sensor 11 is disposed in the liquid storage bin of the battery box and is used to detect the liquid level in the liquid storage bin.

[0081] The outlet water temperature sensor 12 is arranged at the outlet of the third pipeline and is used to detect the temperature of the coolant flowing out of the third pipeline.

[0082] The inlet water temperature sensor 13 is arranged at the inlet of the third pipeline and is used to detect the temperature of the coolant flowing into the third pipeline.

[0083] The high-pressure pressure sensor 14 is arranged at the outlet of the compressor 8 and is used to detect the pressure of the cooling medium at the outlet of the compressor 8.

[0084] The low-pressure pressure sensor 15 is arranged at the inlet of the compressor 8 and is used to detect the pressure of the cooling medium at the inlet of the compressor 8.

[0085] The compressor exhaust humidity sensor 16 is arranged at the outlet of the compressor 8 and is used to detect the exhaust humidity of the compressor 8.

[0086] In the specific implementation process, the thermal management controller 2 collects the data of each sensor in real time, including the liquid level, temperature and pressure information, and adjusts the working state of the system according to these data.

[0087] It can be understood that the comprehensive sensor monitoring network enables the system to grasp the working state of the cooling system in real time, which helps to achieve precise control and improve the reliability and safety of the system.

[0088] In this embodiment, the vehicle thermal management system further includes a steering system controller 17 and a braking system controller 18. The steering system controller 17 collects and sends the vehicle steering state information to the thermal management controller 2 through the vehicle CAN bus. The braking system controller 18 is used to collect and send the vehicle braking state information to the thermal management controller 2 through the vehicle CAN bus.

[0089] In the specific implementation process, the steering system controller 17 and the braking system controller 18 send the vehicle state information to the thermal management controller 2 through the CAN bus, and the thermal management controller 2 can adjust the cooling strategy according to this information.

[0090] It can be understood that by integrating the steering and braking state information of the vehicle, the thermal management system can more intelligently predict and respond to the heat dissipation requirements of the battery. For example, during frequent braking or sharp turning, the system can increase the cooling intensity in advance to prevent the sudden increase of the battery temperature. This forward-looking control strategy improves the reaction speed and efficiency of the system, further optimizes the temperature management of the battery, extends the battery life, and improves the overall performance and safety of the vehicle at the same time.

[0091] Embodiment 3

[0092] In this embodiment, asFigure 3 As shown, the external CAN communication device 1 is equipped with a display screen. There are three working mode control switches, namely OFF, CYCLE, and COOL, as well as the AUTO option on the display screen, which are used to send working instructions to the thermal management controller 2 to select different working modes. The external CAN communication device 1 or the thermal management controller 2 sends corresponding working instructions, and the thermal management controller 2 enters the corresponding working mode in response to the working instructions of the CAN communication device. When the AUTO option is activated, it responds to the OFF, CYCLE, and COOL instructions sent by the CAN communication device and starts working. When the AUTO option of the CAN communication device is not activated, it responds to the working instructions of the battery management system 3. At this time, the OFF, CYCLE, and COOL instructions are sent through the CAN communication device, and the thermal management controller 2 does not respond to the instructions of the CAN communication device. The specific operation process is as follows:

[0093] Forced shutdown process: Press the OFF switch, and the external CAN communication device 1 sends a shutdown instruction to the thermal management controller 2 via the CAN bus. In the cooling mode, the thermal management controller 2 controls the compressor relay 10, the electronic water pump relay 7, and the fan 5 to stop working in sequence and enter the shutdown state. In the self-circulation mode, the thermal management controller 2 controls the electronic water pump relay 7 to disconnect and enter the shutdown state.

[0094] Forced circulation and liquid addition process: Press the CYCLE switch, and the external CAN communication device 1 sends a self-circulation working instruction for the water pump 6 to the thermal management controller 2 via the CAN bus. The thermal management controller 2 controls the water pump relay 7 to close. After the water pump 6 is powered on, it starts working, expels the air in the pipeline, and then the water tank can be refilled.

[0095] Forced cooling process: Press the COOL switch, and the external CAN communication device 1 sends a cooling working instruction to the thermal management controller 2 via the CAN bus. The thermal management controller 2 first controls the water pump relay 7 to close. If the water pump 6 works normally after being powered on, it is determined that the water pump 6 has no fault. Subsequently, the thermal management controller 2 controls the DC / DC to work, controls the compressor relay 10 to close, and the compressor controller 9 immediately controls the compressor 8 to work. At the same time, the thermal management controller 2 controls the fan 5 to work. During the entire working process, the thermal management controller 2 continuously collects the signals of the liquid level sensor 11, the outlet water temperature sensor 12, the inlet water temperature sensor 13, the exhaust temperature sensor of the compressor 8, the high-pressure pressure sensor 14, and the low-pressure pressure sensor 15, and adjusts the rotation speeds of the water pump 6, the compressor 8, and the fan 5 according to the control logic.

[0096] In this embodiment, when the operator presses the CYCLE switch, the external CAN communication device 1 sends a self-circulation working instruction for the water pump 6 to the thermal management controller 2 via the CAN bus. After receiving the instruction, the thermal management controller 2 controls the water pump relay 7 to close, enabling the water pump 6 to be powered on. If the water pump 6 operates normally, it can be determined that the water pump 6 has no faults. If the water pump 6 cannot operate normally after being powered on, it indicates that the water pump 6 has a fault. At this time, the system will prompt for further detection and troubleshooting.

[0097] In this embodiment, when the operator presses the COOL switch, the external CAN communication device 1 sends a refrigeration working instruction to the thermal management controller 2 via the CAN bus. The thermal management controller 2 first controls the water pump relay 7 to close and starts the water pump 6. If the water pump 6 operates normally, it is determined that the water pump 6 has no faults. Subsequently, the thermal management controller 2 controls the DC / DC to operate and controls the compressor relay 10 to close. The compressor controller 9 then starts the compressor 8. At the same time, the thermal management controller 2 also controls the fan 5 to start working. During the entire working process, the thermal management controller 2 continuously collects the signals of the liquid level sensor 11, the outlet water temperature sensor 12, the inlet water temperature sensor 13, the exhaust temperature sensor of the compressor 8, the high-pressure pressure sensor 14, and the low-pressure pressure sensor 15. The thermal management controller 2 adjusts the rotation speeds of the water pump 6, the compressor 8, and the fan 5 according to these signals and the preset control logic. If abnormal signals or abnormal device working states are found during this process, the system will prompt for corresponding fault detection and troubleshooting.

[0098] In this embodiment, the external CAN communication device 1 has a reserved expansion interface 104, which can send working instructions to the steering system controller 17 and the braking system controller 18 via the CAN bus to perform corresponding functions and detections. It should be noted that these working instructions sent through the expansion interface 104 have a higher priority than the working instructions sent by the vehicle's own controller. This design enables the external device to override the vehicle's default control logic when necessary, facilitating fault diagnosis and special working condition testing.

[0099] In this embodiment, the vehicle thermal management system further includes a DC / DC converter 20 for providing a stable power supply.

[0100] Embodiment 4

[0101] This embodiment provides a vehicle, which is the vehicle thermal management system based on CAN communication as described in any of the above embodiments.

[0102] Identical or similar reference numerals correspond to identical or similar components.

[0103] The terms describing the positional relationship in the drawings are for illustrative purposes only and should not be construed as a limitation of this patent.

[0104] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A vehicle thermal management system based on CAN communication, characterized in that, Including: External CAN communication device (1), thermal management controller (2), battery management system (3) and battery cooling assembly (4); The external CAN communication device (1) accesses the vehicle's CAN network through the vehicle OBD interface (19) and is communicatively connected to the thermal management controller (2); The battery management system (3) is communicatively connected to the thermal management controller (2) through the vehicle's CAN network; The thermal management controller (2) is electrically connected to the battery cooling assembly (4).

2. The vehicle thermal management system based on CAN communication according to claim 1, characterized in that The battery cooling assembly (4) includes a fan (5); The fan (5) is installed at the air inlet or outlet of the battery box and is used for forced air cooling of the battery box.

3. The vehicle thermal management system based on CAN communication according to claim 1, characterized in that The battery cooling assembly (4) includes a water pump (6) and a water pump relay (7); The water pump (6) is used to circulate coolant to the battery box; The water pump relay (7) is used to control the operation of the water pump (6).

4. The vehicle thermal management system based on CAN communication according to claim 3, characterized in that, The water pump (6) is connected to the battery box through a cooling circuit; The cooling circuit includes a cooling plate, a first pipe and a second pipe; The cooling plate is arranged on the surface of the battery box, and a third pipe is provided inside the cooling plate; The water inlet of the water pump (6) is connected to the liquid storage chamber of the battery box, one end of the first pipe is connected to the water outlet of the water pump (6), and the other end is connected to the water inlet of the third pipe; One end of the second pipe is connected to the water outlet of the third pipe, and the other end is connected to the liquid storage chamber of the battery box.

5. The vehicle thermal management system based on CAN communication according to claim 4, wherein The battery cooling assembly (4) further includes a compressor (8), a compressor controller (9) and a compressor relay (10); The compressor (8) is used to compress the cooling medium in the cooling circuit to lower the temperature of the coolant; The compressor controller (9) is used to control the operation of the compressor (8); The compressor relay (10) is used to control the operation of the compressor controller (9).

6. The vehicle thermal management system based on CAN communication according to claim 5, characterized in that, The vehicle thermal management system further includes a sensor assembly, and the sensor assembly is electrically connected to the thermal management controller (2).

7. The vehicle thermal management system based on CAN communication according to claim 6, wherein, The sensor assembly includes a liquid level sensor (11), an outlet water temperature sensor (12), an inlet water temperature sensor (13), a high-pressure pressure sensor (14), a low-pressure pressure sensor (15) and a compressor exhaust humidity sensor (16); The liquid level sensor (11) is arranged in the liquid storage chamber of the battery box and is used to detect the liquid level in the liquid storage chamber; The outlet water temperature sensor (12) is arranged at the water outlet of the third pipe and is used to detect the temperature of the coolant flowing out of the third pipe; The inlet water temperature sensor (13) is arranged at the water inlet of the third pipe and is used to detect the temperature of the coolant flowing into the third pipe; The high-pressure pressure sensor (14) is arranged at the outlet of the compressor (8) and is used to detect the pressure of the cooling medium at the outlet of the compressor (8); The low-pressure pressure sensor (15) is arranged at the inlet of the compressor (8) and is used to detect the pressure of the cooling medium at the inlet of the compressor (8); The compressor exhaust humidity sensor (16) is arranged at the outlet of the compressor (8) and is used to detect the exhaust humidity of the compressor (8).

8. The vehicle thermal management system based on CAN communication according to claim 1, characterized in that The vehicle thermal management system further includes a steering system controller (17); The steering system controller (17) is configured to collect and send vehicle steering status information to the thermal management controller (2) via the vehicle CAN bus.

9. The vehicle thermal management system based on CAN communication according to claim 1, characterized in that The vehicle thermal management system further includes a braking system controller (18); The braking system controller (18) is configured to collect and send vehicle braking status information to the thermal management controller (2) via the vehicle CAN bus.

10. A vehicle, characterized in that, It includes a CAN communication-based vehicle thermal management system according to any one of claims 1 to 9.

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