Device Cooling System and Thermal Management System

Abstract

The present application provides a device cooling system and a thermal management system. The thermal management system includes an electric drive liquid cooling loop and a battery liquid cooling loop. The device cooling system includes an on-board device, a main controller, and a valve set. The on-board device is provided with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is connected to the valve set, the valve set is connected to the electric drive liquid cooling loop to form a first path, and the valve set is connected to the battery liquid cooling loop to form a second path, and the valve set is configured to control a switch state to connect the first path or the second path. The on-board device is provided with a temperature and humidity detection device. The main controller is configured to obtain a dew point temperature based on the temperature and humidity detected by the temperature and humidity detection device, and control the valve set to switch the switch state based on the dew point temperature. According to the device cooling system and the thermal management system provided in the present application, the problem of condensation occurring when the on-board device is connected to a liquid cooling circulation system can be solved.

Description

[Technical field]

[0001] TECHNICAL FIELD This application relates to the field of thermal management technologies, and more particularly to device cooling and thermal management systems. [Background technology]

[0002] Condensation is a phenomenon in which the absolute humidity of the air remains constant and the air temperature decreases, the humidity of the air reaches saturation when the temperature decreases to a certain value, and the moisture in the air is condensed as the temperature continues to decrease. The dew point temperature is the temperature at which the relative humidity of the air can reach 100% under the assumption that the mixture ratio and atmospheric pressure remain constant. Water droplets on devices may cause abnormal phenomena such as electrochemical corrosion and mold growth. Water droplets dripping on the electrical components of devices may cause problems such as short circuits and explosions.

[0003] Take the vehicle field as an example. As the functions of the on-board devices become more and more powerful, the power consumption of the chips in the on-board devices becomes greater and greater. Therefore, the heat dissipation requirements of the on-board devices become higher and higher, and the heat dissipation requirements cannot be met by natural heat dissipation or air-cooled heat dissipation alone. In order to improve the heat dissipation efficiency, the on-board devices may be connected to the liquid cooling circulation system of the vehicle. However, the temperature difference between the air and the coolant in the liquid cooling circulation system is large. As a result, when the warm air in the on-board device touches the cold housing of the on-board device, condensation may occur, which causes the risk of corrosion and short circuit occurring on the main board and electronic components of the on-board device. Summary of the Invention

[0004] In the embodiment of the present application, a device cooling system and a thermal management system are provided that solve the problem of condensation occurring when a device is connected to a liquid cooling circulation system. When the solution is applied to a vehicle system, the risk of condensation occurring in an in-vehicle device can be reduced, and vehicle safety can be improved. [Means for solving the problem]

[0005] In an aspect of an embodiment of the present application, a device cooling system is provided for application in a thermal management system. The thermal management system includes an electric drive liquid cooling loop and a battery liquid cooling loop. The device cooling system includes an on-board device, a main controller, and a valve set. A liquid inflow pipe and a liquid outflow pipe are arranged in the on-board device, the liquid inflow pipe is in communication with the valve set, the valve set is connected to the electric drive liquid cooling loop to form a first path, the valve set is connected to the battery liquid cooling loop to form a second path, the valve set is configured to control a switch state to connect the first path or the second path, and the liquid outflow pipe is connected to the electric drive liquid cooling loop or the battery liquid cooling loop. A temperature and humidity detection device is arranged in the on-board device. A main controller is individually connected to the temperature and humidity detection device and the valve set, and the main controller is configured to obtain a dew point temperature based on the temperature and humidity detected by the temperature and humidity detection device, and control the valve set to switch a switch state based on the dew point temperature.

[0006] According to the device cooling system provided in the embodiment of the present application, a temperature and humidity detection device is disposed in the vehicle-mounted device to obtain the dew point temperature of the air in the vehicle-mounted device. The vehicle-mounted device is connected to the electric drive liquid cooling loop and the battery liquid cooling loop using a valve set. The vehicle-mounted device is connected to the electric drive liquid cooling loop or the battery liquid cooling loop by switching the switch using the valve set. In this way, the temperature of the coolant entering the vehicle-mounted device is always equal to or higher than the dew point temperature of the air in the vehicle-mounted device. This can avoid the condensation phenomenon from occurring in the vehicle-mounted device, and can improve and extend the reliability and service life of the vehicle-mounted device.

[0007] In a possible implementation, a first temperature sensor is disposed between the electric drive liquid cooling loop and the valve set, and a second temperature sensor is disposed between the battery liquid cooling loop and the valve set. A main controller is connected to the first temperature sensor and the second temperature sensor, respectively. The main controller is configured to obtain a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor, compare the dew point temperature, the first temperature, and the second temperature, and control to connect a path corresponding to a lower temperature of the first temperature and the second temperature when both the first temperature and the second temperature are equal to or higher than the dew point temperature, or control to connect a path corresponding to a higher temperature of the first temperature and the second temperature when either the first temperature or the second temperature is equal to or higher than the dew point temperature.

[0008] In this case, the liquid inlet temperature of the electric drive liquid cooling loop and the battery liquid cooling loop may be compared with the dew point temperature, so that the temperature of the coolant entering the vehicle-mounted device can be more accurately controlled, thereby preventing condensation from occurring in the vehicle-mounted device and allowing the vehicle-mounted device to be at the lowest operating temperature, thereby improving the reliability of the vehicle-mounted device and reducing the failure rate.

[0009] In a possible implementation, the device cooling system further includes a first heater, the first heater being connected between the valve set and the liquid inlet pipe, and a main controller being connected to the first heater, the main controller being configured to control the first heater to be turned on when both the first temperature and the second temperature are less than a dew point temperature.

[0010] The first heater is arranged to heat the low-temperature water from the battery liquid cooling loop or the electric drive liquid cooling loop, so that the temperature of the water entering the on-board device is equal to or higher than the dew point temperature, thereby avoiding the condensation phenomenon.

[0011] In a possible implementation, the device cooling system further includes a third temperature sensor, which may be connected between the first heater and the liquid inlet pipe, and a main controller is connected to the third temperature sensor, and the main controller is configured to obtain a third temperature detected by the third temperature sensor and control the first heater to be turned on such that the third temperature is not below a dew point temperature.

[0012] A third temperature sensor may be arranged to monitor the temperature of the water entering the vehicle-mounted device in real time, thereby ensuring that the temperature of the water entering the vehicle-mounted device is equal to or higher than the dew point temperature, and avoiding the excessively high temperature of the water caused by the excessive heating power of the first heater, which affects the cooling efficiency and operation reliability of the vehicle-mounted device.

[0013] In a possible implementation, the valve set includes a first three-way solenoid valve, an outlet of the first three-way solenoid valve connected to a liquid inlet pipe, a first inlet of the first three-way solenoid valve connected to an electric drive liquid cooling loop, and a second inlet of the first three-way solenoid valve connected to a battery liquid cooling loop.

[0014] The first three-way solenoid valve can be switched to have two inlets open, allowing the liquid inlet pipes to be connected to two loops in a case with few parts and simple piping.

[0015] In a possible implementation, the valve set includes a first two-way solenoid valve and a second two-way solenoid valve, the first two-way solenoid valve being connected between the electric drive liquid cooling loop and the liquid inlet pipe, and the second two-way solenoid valve being connected between the battery liquid cooling loop and the liquid inlet pipe.

[0016] By disposing two 2-way solenoid valves, the function of two 2-way solenoid valves can be implemented as the function of one 3-way solenoid valve. In addition, the pipe connection relationship is simple and easy to implement.

[0017] In a possible implementation, the in-vehicle device includes a housing and a main board disposed in the housing. The housing includes a hot and cold plate, and a liquid inlet pipe and a liquid outlet pipe are disposed in the hot and cold plate.

[0018] A cold / hot plate placed on the in-vehicle device is used to implement the connection between the in-vehicle device and the liquid cooling loop, so as to implement the liquid cooling of the in-vehicle device and provide excellent protection for the main board.

[0019] In a possible implementation, the electric drive liquid cooling loop includes a radiator, a first kettle, a first water pump, and a power train in series communication with each other through a duct, with a valve set connected between the first water pump and the power train.

[0020] In this way, the low temperature coolant of the electric drive liquid cooling loop can enter the on-board devices.

[0021] In a possible implementation, the electric drive liquid cooling loop further includes a second three-way solenoid valve, an inlet of the second three-way solenoid valve is connected to the powertrain, and two outlets of the second three-way solenoid valve are connected to the radiator and the first kettle, respectively.

[0022] The second three-way solenoid valve is deployed so that when the heat generated by the powertrain is low, the heat dissipation requirements can be met through the coolant circuit alone and the radiator does not need to be turned on, thus lowering energy consumption.

[0023] In a possible implementation, the battery liquid cooling loop includes a compressor, a heat exchanger, a condenser, a second kettle, a second water pump, and a battery pack. The compressor, the heat exchanger, and the condenser are connected in series through conduits to form a refrigerant loop. The second kettle, the second water pump, the heat exchanger, and the battery pack are connected in series through conduits to form a coolant loop. A valve set is connected between the heat exchanger and the battery pack.

[0024] In this way, the low temperature coolant of the battery liquid cooling loop can enter the on-board devices.

[0025] In a possible implementation, the battery liquid cooling loop further includes a second heater connected between the heat exchanger and the battery pack, and a valve set connected between the second heater and the battery pack.

[0026] The second heater is configured to heat the coolant to heat the battery pack when temperatures are low in winter, thereby preventing low temperatures from affecting the operation of the battery pack.

[0027] In a possible implementation, the in-vehicle device includes a domain controller, an on-board charger or an electronic control unit ECU.

[0028] Several types of in-vehicle devices can all be used with the above cooling device to provide efficient cooling and condensation prevention.

[0029] In a possible implementation, the main controller is a vehicle control unit VCU or a controller in an on-board device.

[0030] For high vehicle integration, the main controller may be incorporated into a vehicle control unit, or for easy circuit connection, the main controller may be a controller included in an in-vehicle device.

[0031] In another aspect of an embodiment of the present application, a thermal management system is provided, the thermal management system including an electric drive liquid cooling loop, a battery liquid cooling loop, and the device cooling system described above.

[0032] In the thermal management system of the embodiment of the present application, the electric drive liquid cooling loop and the battery liquid cooling loop are arranged to cool the two main heat generating devices, namely the powertrain and the battery pack, respectively. In addition, the on-board device may be connected to the electric drive liquid cooling loop or the battery liquid cooling loop under the control of the main controller. In this way, the liquid cooling of the on-board device can be implemented, and the condensation phenomenon of the on-board device can be avoided.

[0033] In another aspect of an embodiment of the present application, there is further provided a method of controlling a device cooling system, the method comprising: acquiring temperature information and humidity information detected by a temperature and humidity detection device of an in-vehicle device, and calculating a dew point temperature based on the temperature information and the humidity information; determining whether the dew point temperature falls within a first interval or a second interval; controlling the valve set to switch to open a first path when the dew point temperature is in a first zone, the first path connecting the on-board device with the electric drive liquid cooling loop; or The method includes controlling the valve set to switch to open a second path when the dew point temperature belongs to a second zone, the second path connecting the on-board device to the battery liquid cooling loop.

[0034] Through the analysis of the dew point temperature, when the dew point temperature belongs to different intervals, the on-board device can be controlled to be connected to different liquid cooling loops, so that the temperature of the coolant entering the on-board device is always equal to or higher than the dew point temperature of the air inside the on-board device, thereby avoiding the occurrence of condensation in the on-board device.

[0035] In a possible implementation, the step of determining whether the dew point temperature belongs to the first interval or the second interval includes: acquiring a first temperature detected by a first temperature sensor and a second temperature detected by a second temperature sensor, the first temperature being a liquid inlet temperature of a first path and the second temperature being a liquid inlet temperature of a second path; comparing the dew point temperature, the first temperature and the second temperature; When the dew point temperature is equal to or lower than either a first temperature or a second temperature, determining that the dew point temperature belongs to a first interval when the first temperature exceeds the second temperature, or determining that the dew point temperature belongs to a second interval when the first temperature is lower than the second temperature; or In particular, the method includes a step of determining that the dew point temperature belongs to the second interval when the first temperature exceeds the second temperature, or determining that the dew point temperature belongs to the first interval when the first temperature is less than the second temperature, when the dew point temperature is less than both the first temperature and the second temperature.

[0036] Based on the result of comparing the liquid inlet temperature and the dew point temperature of each of the two loops, the temperature of the coolant entering the on-board device can be more accurately controlled, thereby avoiding the condensation phenomenon.

[0037] In a possible implementation, the method for controlling the device cooling system further includes a step of determining whether the dew point temperature belongs to a third zone, and if the dew point temperature belongs to the third zone, controlling a first heater to be turned on, the first heater being disposed between the valve set and the on-board device.

[0038] When the dew point temperature is high and the condensation phenomenon cannot be avoided regardless of whether the on-board device is connected to an electric drive liquid cooling loop or a battery liquid cooling loop, the coolant may be heated using a heater so that the inlet liquid temperature is equal to or higher than the dew point temperature.

[0039] In a possible implementation, the step of determining whether the dew point temperature belongs to the third interval includes: Comparing the dew point temperature, the first temperature, and the second temperature, and determining that the dew point temperature belongs to a third interval if the dew point temperature exceeds both the first temperature and the second temperature. In particular:

[0040] Based on the result of comparing the liquid inlet temperatures and dew point temperatures of each of the two loops, it can be more accurately determined that the liquid inlet temperatures of the two loops are both below the dew point temperatures, and at that time, the heater is turned on in a timely manner to prevent condensation.

[0041] In this embodiment of the present application, there is further provided a device cooling system for use in a thermal management system including two or more liquid cooling loops. The thermal management system includes a first liquid cooling loop and a second liquid cooling loop. A cooling temperature of a coolant in the first liquid cooling loop exceeds a cooling temperature of a coolant in the second liquid cooling loop. The device cooling system includes a device to be cooled, a main controller, and a valve set. A liquid inlet pipe of the device to be cooled communicates with the valve set, and the valve set is connected to the first liquid cooling loop to form a first path, and the valve set is connected to the second liquid cooling loop to form a second path. The valve set is configured to control a switch state to connect the first path or the second path. A liquid outlet pipe of the device to be cooled is connected to the first liquid cooling loop and the second liquid cooling loop. A temperature and humidity detection device is disposed on the device to be cooled, and the main controller is connected to the temperature and humidity detection device and the valve set, respectively. The main controller is configured to obtain a dew point temperature according to the temperature and humidity detected by the temperature and humidity detection device, and control the valve set to switch a switch state according to the dew point temperature. The device cooling system provided in this embodiment of the present application may be used in the above-mentioned thermal management system in a vehicle, and may also be used in fields such as power systems and data centers.

[0042] According to the device cooling system, thermal management system and method for controlling the device cooling system provided in the embodiments of the present application, a temperature and humidity detection device is arranged in the vehicle-mounted device to obtain the dew point temperature of the air in the vehicle-mounted device, the vehicle-mounted device is connected to the electric drive liquid cooling loop and the battery liquid cooling loop using a valve set, and the vehicle-mounted device is connected to the electric drive liquid cooling loop or the battery liquid cooling loop by controlling the valve set to switch. In this way, the temperature of the coolant entering the vehicle-mounted device is always equal to or higher than the dew point temperature of the air in the vehicle-mounted device. This can avoid the condensation phenomenon in the vehicle-mounted device, improve and extend the reliability and service life of the vehicle-mounted device, and help improve the reliability of the vehicle thermal management system. [Brief description of the drawings]

[0043] [Figure 1] FIG. 1 is a schematic diagram of connecting an in-vehicle device to an electric drive liquid cooling loop according to the prior art. [Diagram 2] FIG. 1 is a schematic diagram of connecting an in-vehicle device to a battery liquid cooling loop according to the prior art. [Diagram 3] FIG. 1 is a schematic diagram of a device cooling system according to an embodiment of the present application. [Figure 4] 1 is a schematic diagram of a structure of an in-vehicle device according to an embodiment of the present application; [Diagram 5] FIG. 2 is a schematic diagram of another structure of a device cooling system according to an embodiment of the present application. [Figure 6] FIG. 2 is a schematic diagram of yet another structure of a device cooling system according to an embodiment of the present application. [Figure 7] FIG. 2 is a schematic diagram of yet another configuration of a device cooling system according to an embodiment of the present application. [Figure 8] 4 is an operation flowchart of a main controller of the device cooling system according to the embodiment of the present application. [Figure 9] FIG. 2 is another schematic diagram of a device cooling system according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0044] In an embodiment of the present application, a thermal management system is provided. The thermal management system is applied to an electric vehicle and configured to perform thermal energy management for a vehicle system. The thermal management system may include two liquid cooling circulation systems, an electric drive liquid cooling loop and a battery liquid cooling loop. A powertrain is connected to the electric drive liquid cooling loop to cool the powertrain, and a battery pack is connected to the battery liquid cooling loop to cool the battery pack.

[0045] In addition to the two main heat-generating devices, the powertrain and the battery pack, the vehicle also includes several types of on-board devices, such as a domain controller (sometimes called a mobile data center, or MDC), an on-board charger, and an electronic control unit (ECU). device The battery may be located in the engine compartment, in the front passenger glove box, under the seat, or in another location in the electric vehicle. device It is required to support high ambient temperatures. When the heat dissipation environment is harsh and the in-vehicle device is operating, the temperature of the components will increase, and the nearby ambient temperature will also affect the internal temperature of the device. This will affect the reliability of the operation of the electronic components. In the electronics industry, a 10°C increase in the ambient temperature of a component usually doubles the failure rate of the electronic components. In order to ensure the normal operation of the in-vehicle device and the smooth running of the vehicle, the heat dissipation of the in-vehicle device also needs to be taken into consideration. Therefore, the thermal management system may further include a device cooling system.

[0046] In the prior art, an in-vehicle device may support natural heat dissipation or air-cooled heat dissipation. The in-vehicle device may include a radiator housing and a main board disposed in the radiator housing. Chips and other electronic components are disposed on the main board. Heat generated by the main board, the chips and other electronic components may be transferred to the radiator housing through radiation and convection. A plurality of heat dissipation fins are disposed on the radiator housing, and the heat transferred to the heat dissipation fins may be dissipated to the outside air through radiation and convection.

[0047] On the other hand, device As the functions of the chip become more and more powerful, the computing power of the chip increases accordingly, and the power consumption of the chip also increases, resulting in higher and higher heat dissipation requirements. Take a computing device as an example. As the level of autonomous driving increases continuously, the requirements for the computing power of the domain controller increase continuously. For example, the operating volume needs to be increased from 10 Tflops to 300 Tflops or even higher. As a result, the power consumption of the domain controller system increases, for example, from 20 W to 300 W. As a result, the domain controller cannot meet the heat dissipation requirements of the high-power controller through natural heat dissipation or air-cooled heat dissipation. Therefore, it is essential to design the domain controller to dissipate heat through liquid cooling.

[0048] In the conventional technology, in order to perform liquid-cooling heat dissipation for an in-vehicle device, the in-vehicle device may be connected to an electric drive liquid-cooling loop or a battery liquid-cooling loop.

[0049] FIG. 1 is a schematic diagram of an in-vehicle device connected to an electric drive liquid cooling loop according to the prior art. As shown in FIG. 1, the electric drive liquid cooling loop 300 may include a radiator 31, a first kettle 32, a first water pump 33, a power train 34, and a first fan 36. The radiator 31, the first kettle 32, the first water pump 33, and the power train 34 may be sequentially connected through a pipe to form a loop, and a coolant such as water may circulate through the loop. Heat generated by the power train 34 is removed by the coolant and dissipated by the radiator 31. In order to improve the heat dissipation efficiency of the radiator 31, a first fan 36 may be disposed close to the radiator 31.

[0050] The in-vehicle device 100 may be connected between the first water pump 33 and the powertrain 34, so that the heat of the in-vehicle device 100 can be dissipated by a coolant such as water in the electric drive liquid-cooling loop 300. However, the temperature of the water in the electric drive liquid-cooling loop 300 is usually above 40° C. and may even reach 65° C. If the temperature of the water in the electric drive liquid-cooling loop 300 is high, the cooling effect on the in-vehicle device 100 will be limited. In addition, if a high ambient temperature is maintained, the failure rate of electronic components in the in-vehicle device 100 may increase.

[0051] FIG. 2 is a schematic diagram of a conventional technology for connecting an on-board device to a battery liquid cooling loop. As shown in FIG. 2, the battery liquid cooling loop 400 may include a compressor 41, a heat exchanger 42, a condenser 43, a second kettle 44, a second water pump 45, a battery pack 46, and a second fan 48. The compressor 41, the heat exchanger 42, and the condenser 43 are sequentially connected through a pipe to form a loop, and a refrigerant can circulate through the loop. The heat exchanger 42, the second kettle 44, the second water pump 45, and the battery pack 46 are sequentially connected through a pipe to form a loop, and a coolant such as water can circulate through the loop. Heat generated by the battery pack 46 can be removed by the coolant such as water, and the heat is exchanged in the heat exchanger 42, and the refrigerant is condensed in the condenser 43 for heat dissipation. In order to improve the heat dissipation efficiency of the condenser 43, a second fan 48 may be disposed close to the condenser 43.

[0052] The in-vehicle device 100 may be connected between the heat exchanger 42 and the battery pack 46, so that the heat of the in-vehicle device 100 can be dissipated by a coolant such as water in the battery liquid cooling loop 400. However, the temperature of the water in the battery liquid cooling loop 400 is usually about 20° C. In summer, the ambient temperature when the in-vehicle device 100 is installed and deployed is usually about 40° C. There is a temperature difference of 20° C. between the temperature of the water and the ambient temperature. When the warm air of the in-vehicle device 100 touches the wall of the housing of the cold device, condensation may occur. Condensation may cause the risk of corrosion and short circuit occurring in the board components. As a result, the board will fail.

[0053] In order to solve the problem of condensation occurring after the in-vehicle device 100 is connected to a liquid cooling system, a waterproof in-vehicle device 100 may be specially provided. The in-vehicle device 100 may include an upper housing, a lower housing, and a connector. A waterproof sealant is directly applied to the mechanical parts of the lower housing and the connector, and the upper housing and the lower housing are assembled together using screws before the waterproof sealant is solidified. After the waterproof sealant is completely solidified, a perfect adhesion is formed, and the upper housing, the lower housing, and the connector are combined and sealed together, and a waterproof function can be performed between the connector and the cable and between the connector and the housing of the device. In this way, the in-vehicle device 100 as a whole achieves a waterproof requirement of IP67 or more, and can prevent moisture from entering and delay the occurrence of condensation. However, the solution for isolating moisture has a risk of long-term reliability, and the waterproof sealant may not be able to seal the device. In addition, if the waterproof sealant is used for a long time, the moisture inside and outside the in-vehicle device 100 will eventually reach equilibrium, and condensation will occur.

[0054] Another possible implementation is to use a coating design on the surface of the main board of the in-vehicle device 100, which can prevent corrosion and short circuit of components caused by water droplets on the board. However, it has a series of problems, such as low manufacturing efficiency, high cost, moisture-proof but not waterproof, and impact on heat dissipation of components.

[0055] It should be noted that a high air temperature indicates that the air can contain more water vapor and therefore has a high saturation humidity. If the air temperature is lowered by maintaining the humidity of the air, when the temperature is below a certain value, the partial pressure of water vapor will reach the saturation pressure corresponding to the current temperature of the air. In this case, the water vapor in the air will reach a saturated state. If the air temperature is further lowered, the water vapor will condense and leave the air, and this phenomenon is called condensation. The dew point temperature is the temperature to which the air is cooled to a saturated state without changing the humidity and the atmospheric pressure.

[0056] In the in-vehicle device 100, condensation occurs when moist, warm air inside the device touches a surface of the housing whose temperature is below the dew point temperature. Therefore, the temperature of the coolant entering the in-vehicle device 100 is controlled to always be equal to or higher than the dew point temperature of the air inside the in-vehicle device 100, thereby avoiding the condensation phenomenon.

[0057] Based on the above problem, an embodiment of the present application provides a device cooling system. A temperature and humidity detection device is arranged in the vehicle-mounted device to obtain the dew point temperature of the air in the vehicle-mounted device, and the vehicle-mounted device is connected to the electric drive liquid cooling loop and the battery liquid cooling loop using a valve set, and the valve set switches to enable the vehicle-mounted device to be connected to the electric drive liquid cooling loop or the battery liquid cooling loop. In this way, the temperature of the coolant entering the vehicle-mounted device is always equal to or higher than the dew point temperature of the air in the vehicle-mounted device. This can avoid the condensation phenomenon occurring in the vehicle-mounted device, and improve and extend the reliability and service life of the vehicle-mounted device.

[0058] FIG. 3 is a schematic diagram of a device cooling system according to an embodiment of the present application. FIG. 4 is a schematic diagram of a structure of an on-board device according to an embodiment of the present application. As shown in FIG. 3 and FIG. 4, a device cooling system is provided in this embodiment of the present application. The device cooling system may include an on-board device 100, a main controller (not shown in the figure), and a valve set. A liquid inflow pipe 113 and a liquid outflow pipe 114 are arranged in the on-board device 100. The liquid inflow pipe 113 communicates with the valve set, and the valve set is connected to the electric drive liquid cooling loop to form a first path, and the valve set is connected to the battery liquid cooling loop to form a second path. The valve set is configured to control a switch state to connect the first path or the second path. The liquid outflow pipe 114 is connected to the electric drive liquid cooling loop or the battery liquid cooling loop.

[0059] The in-vehicle device 100 may include a housing 11 and a main board 12 disposed in the housing 11. The housing 11 may include an upper housing 111 and a lower housing 112. The upper housing 111 and the lower housing 112 may be connected using screws. A connector 13 may be sandwiched between the upper housing 111 and the lower housing 112, and the connector 13 is configured to be connected to an external cable. The upper housing 111 may include a hot / cold plate, and a liquid inlet pipe 113 and a liquid outlet pipe 114 are disposed in the hot / cold plate. A coolant such as water may enter the hot / cold plate from the liquid inlet pipe 113 to absorb heat, and may then be discharged from the liquid outlet pipe 14.

[0060] In this embodiment of the present application, a valve set is arranged to connect the liquid inlet pipe 113 to the electric drive liquid cooling loop and the battery liquid cooling loop. The valve set is controlled to switch, so that the low-temperature cold water of the electric drive liquid cooling loop or the battery liquid cooling loop enters the vehicle-mounted device 100 from the liquid inlet pipe 113 and then discharges from the liquid outlet pipe 114. In this way, the vehicle-mounted device 100 can be cooled using the liquid cooling system. The liquid cooling system has high cooling efficiency, and the liquid cooling system can prevent condensation by controlling the liquid inlet temperature.

[0061] The liquid inflow temperature may be implemented by controlling the valve set. In this embodiment of the present application, a temperature and humidity detection device may be disposed in the in-vehicle device 100, and a main controller is separately connected to the temperature and humidity detection device and the valve set. The main controller is configured to obtain a dew point temperature based on the temperature and humidity detected by the temperature and humidity detection device, and control the valve set to switch the switch state based on the dew point temperature, so that the temperature of the coolant such as water entering the in-vehicle device 100 is always equal to or higher than the dew point temperature of the air inside the in-vehicle device 100. This can avoid the condensation phenomenon occurring in the in-vehicle device 100.

[0062] In this case, the method for controlling a device cooling system provided in an embodiment of the present application may include the following steps.

[0063] The main controller acquires temperature information and humidity information detected by the temperature and humidity detection device of the in-vehicle device 100, calculates a dew-point temperature based on the temperature information and humidity information, determines whether the dew-point temperature belongs to a first section or a second section, and controls a valve set to switch to open the first path if the dew-point temperature belongs to the first section, or controls a valve set to switch to open the second path if the dew-point temperature belongs to the second section.

[0064] In a specific embodiment, the water temperature of the battery liquid cooling loop 400 may be lower than the water temperature of the electric drive liquid cooling loop 300. In this case, the temperature of the first section exceeds the temperature of the second section. When the dew point temperature belongs to the second section where the temperature is low and the water temperatures of both the electric drive liquid cooling loop 300 and the battery liquid cooling loop 400 are equal to or higher than the dew point temperature, condensation does not occur when the in-vehicle device is connected to either the electric drive liquid cooling loop or the battery liquid cooling loop. The in-vehicle device 100 may be connected to the battery liquid cooling loop 400 where the water temperature is low to improve cooling efficiency. When the dew point temperature belongs to the first section where the temperature is high, the dew point temperature may be equal to or lower than the water temperature of the electric drive liquid cooling loop 300 and exceed the water temperature of the battery liquid cooling loop 400. In this case, the in-vehicle device 100 may be connected to the electric drive liquid cooling loop 300 where the water temperature is high to avoid condensation.

[0065] It is known that the water temperature in the electric drive liquid cooling loop 300 is high, typically exceeding 40° C., while the water temperature in the battery liquid cooling loop 400 is low, typically around 20° C. For example, the first section may be set to 20° C. to 40° C., and the second section may be set to 0° C. to 20° C.

[0066] Based on the above embodiments, in this embodiment of the present application, temperature sensors may be arranged to detect the temperature of the cooling water from the electric drive liquid cooling loop and the battery liquid cooling loop in order to accurately control the liquid inlet temperature.

[0067] A first temperature sensor may be disposed between the electric drive liquid cooling loop and the valve set, and a second temperature sensor may be disposed between the battery liquid cooling loop and the valve set. A main controller is individually connected to the first temperature sensor and the second temperature sensor. The main controller is configured to obtain a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor, compare the dew point temperature, the first temperature, and the second temperature, and control to connect a path corresponding to a lower temperature of the first temperature and the second temperature when both the first temperature and the second temperature are equal to or higher than the dew point temperature, or control to connect a path corresponding to a higher temperature of the first temperature and the second temperature when either the first temperature or the second temperature is equal to or higher than the dew point temperature.

[0068] In this case, the method for controlling a device cooling system provided in this embodiment of the present application may include the following steps.

[0069] The main controller acquires temperature information and humidity information detected by a temperature and humidity detection device of the in-vehicle device, calculates a dew-point temperature based on the temperature information and humidity information, acquires a first temperature detected by a first temperature sensor and a second temperature detected by a second temperature sensor, compares the dew-point temperature, the first temperature and the second temperature to determine whether the dew-point temperature belongs to a first zone or a second zone, and controls a valve set to switch to open the first path if the dew-point temperature belongs to the first zone, or controls the valve set to switch to open the second path if the dew-point temperature belongs to the second zone.

[0070] Determining whether the dew point temperature belongs to the first interval or the second interval based on the dew point temperature, the first temperature, and the second temperature particularly includes determining that the dew point temperature belongs to the first interval when the first temperature exceeds the second temperature when the dew point temperature is equal to or lower than either the first temperature or the second temperature, or determining that the dew point temperature belongs to the second interval when the first temperature is less than the second temperature, or determining that the dew point temperature belongs to the second interval when the dew point temperature is equal to or lower than both the first temperature and the second temperature when the first temperature exceeds the second temperature, or determining that the dew point temperature belongs to the first interval when the first temperature is less than the second temperature.

[0071] It is obvious that when both the first temperature and the second temperature are equal to or higher than the dew point temperature, the main controller controls to connect a path corresponding to the lower of the first and second temperatures, thereby avoiding condensation and improving cooling efficiency, or when either the first temperature or the second temperature is equal to or higher than the dew point temperature, the main controller controls to connect a path corresponding to the higher of the first and second temperatures, thereby avoiding condensation.

[0072] 3, in a possible implementation, the valve block may be a first three-way solenoid valve 200. The first three-way solenoid valve 200 includes an outlet A, a first inlet B, and a second inlet C. The outlet A of the first three-way solenoid valve 200 is connected to a liquid inlet pipe 113, the first inlet B of the first three-way solenoid valve 200 is connected to an electric drive liquid cooling loop 300, and the second inlet C of the first three-way solenoid valve 200 is connected to a battery liquid cooling loop 400. A main controller is connected to the first three-way solenoid valve 200, and the main controller can switch the inlet of the first three-way solenoid valve 200, thereby connecting the in-vehicle device 100 to the electric drive liquid cooling loop 300 or the battery liquid cooling loop 400. When the first inlet B is opened, the first path is connected and the low-temperature cooling water is supplied to the in-vehicle device 100 by the electric drive liquid-cooling loop 300. When the second inlet C is opened, the second path is connected and the low-temperature cooling water is supplied to the in-vehicle device 100 by the battery liquid-cooling loop 400.

[0073] When the temperature of the water in the battery liquid cooling loop 400 is lower than the temperature of the water in the electric drive liquid cooling loop 300, the control logic of the main controller may be simplified such that the main controller controls the second inlet C of the first three-way solenoid valve 200 to open when both the first temperature and the second temperature are equal to or higher than the dew point temperature, or the main controller controls the first inlet B of the first three-way solenoid valve 200 to open when the first temperature is equal to or higher than the dew point temperature and the second temperature is lower than the dew point temperature.

[0074] 5 is a schematic diagram of another structure of a device cooling system according to an embodiment of the present application. As shown in FIG. 5, in another possible implementation, the valve set may include a first two-way solenoid valve 202 and a second two-way solenoid valve 203. The first two-way solenoid valve 202 is connected between the electric drive liquid cooling loop and the liquid inlet pipe 113, and the second two-way solenoid valve 203 is connected between the battery liquid cooling loop and the liquid inlet pipe 113.

[0075] A main controller is individually connected to the first two-way solenoid valve 202 and the second two-way solenoid valve 203. The main controller can control the first two-way solenoid valve 202 to open, thereby connecting the first path, and low-temperature cooling water is supplied to the in-vehicle device 100 through the electric drive liquid-cooling loop 300. The main controller can control the second two-way solenoid valve 203 to open, thereby connecting the second path, and low-temperature cooling water is supplied to the in-vehicle device 100 through the battery liquid-cooling loop 400.

[0076] As shown in Fig. 3, which is also referred to, in a possible implementation, the liquid outlet pipe 114 of the in-vehicle device 100 may be connected to the electric drive liquid cooling loop 300. Fig. 6 is a schematic diagram of yet another structure of the device cooling system according to an embodiment of the present application. As shown in Fig. 6, in another possible implementation, the liquid outlet pipe 114 of the in-vehicle device 100 may be connected to the battery liquid cooling loop 400.

[0077] It is of course understood that the coolant of the electric drive liquid cooling loop 300 and the coolant of the battery liquid cooling loop 400 can be the same, and both can be water. In addition, the flow rate of the coolant required by the in-vehicle device 100 is much smaller than the flow rate of each of the electric drive liquid cooling loop 300 and the battery liquid cooling loop 400. Therefore, regardless of whether the first path or the second path communicates with the liquid inlet pipe 113, the impact of the coolant entering the electric drive liquid cooling loop 300 or the battery liquid cooling loop 400 on the cooling effect of each of the two loops after the coolant flows out of the in-vehicle device 100 can be negligible.

[0078] 7 is a schematic diagram of yet another structure of the device cooling system according to an embodiment of the present application. As shown in FIG. 7, in a possible implementation, the liquid inlet side of the vehicle-mounted device 100 may be directly connected to the electric drive liquid cooling loop 300 through the first inlet B of the first three-way solenoid valve 200. The vehicle-mounted device 100 may be connected to the battery liquid cooling loop 400 through the second inlet C of the first three-way solenoid valve 200 and the three-way valve V3. The liquid outlet side of the vehicle-mounted device 100 may be directly connected to the electric drive liquid cooling loop 300, which corresponds to the vehicle-mounted device 100 being directly connected in series to the electric drive liquid cooling loop 300. In addition to the above, another branch is implemented on the liquid inlet side through the first three-way solenoid valve 200.

[0079] In this embodiment of the present application, the connection between the valve set and each of the electric drive liquid cooling loop 300 and the battery liquid cooling loop 400 may be performed through a three-way valve. The connection between the liquid outlet pipe of the in-vehicle device 100 and the electric drive liquid cooling loop 300 or the battery liquid cooling loop 400 may also be performed through a three-way valve.

[0080] As shown in Fig. 3 and Fig. 5, three-way valves V1 and V2 may be arranged in the electric drive liquid cooling loop 300, and the three-way valve V1 is located upstream of the three-way valve V2. The coolant enters from the inlet of the three-way valve V1, one outlet of the three-way valve V1 is directly connected to one inlet of the three-way valve V2, the other outlet of the three-way valve V1 is connected to a valve set, the other inlet of the three-way valve V2 is connected to the liquid outlet pipe 114, and the coolant flows out from the outlet of the three-way valve V2. By arranging the three-way valves V1 and V2, a branch circulation is added to the electric drive liquid cooling loop 300 without affecting the main circulation. In this way, a small portion of the coolant enters the vehicle-mounted device 100.

[0081] A three-way valve V3 may be disposed in the battery liquid cooling loop 400. The coolant enters from the inlet of the three-way valve V3, and a part of the coolant flows out from one outlet of the three-way valve V3 and is used as the main circulation of the battery liquid cooling loop 400. The other part of the coolant is connected to the valve set through the other outlet of the three-way valve V3 and enters the in-vehicle device 100. According to the same principle, in FIG. 6, the liquid outlet pipe 114 may flow back to the battery liquid cooling loop 400 through the three-way valve V5.

[0082] By providing a three-way valve, a bypass branch is added to the electric drive liquid cooling loop 300 and the battery liquid cooling loop 400, so that a part of the coolant can be diverted to the vehicle-mounted device 100 to cool the vehicle-mounted device 100. Compared with a solution in which the vehicle-mounted device 100 is directly connected in series to the electric drive liquid cooling loop 30 or the battery liquid cooling loop 400, according to this solution, the flow rate and flow velocity of the coolant entering the vehicle-mounted device 100 can be controlled. This prevents corrosion of the vehicle-mounted device 100 caused by scouring of the coolant with a high flow rate and high flow velocity.

[0083] Based on the above embodiment, as shown in Figures 3 and 5 to 7, in this embodiment of the present application, the device cooling system further includes a first heater 201. The first heater 201 is connected between the first three-way solenoid valve 200 and the liquid inlet pipe 113, and a main controller is connected to the first heater 201. The main controller is configured to control the first heater 201 to be turned on when both the first temperature and the second temperature are less than the dew point temperature. The first heater 201 may be, for example, a PTC (Positive temperature efficiency) heater.

[0084] In this case, the method of controlling a device cooling system provided in this embodiment of the present application may further include: the main controller determining whether the dew point temperature belongs to a third interval, and the main controller controlling the first heater to be turned on when the dew point temperature belongs to the third interval. Determining whether the dew point temperature belongs to the third interval particularly includes: comparing the dew point temperature, the first temperature and the second temperature, and determining that the dew point temperature belongs to the third interval when the dew point temperature exceeds both the first temperature and the second temperature.

[0085] If both the first temperature and the second temperature are below the dew point temperature, condensation will occur when the in-vehicle device 100 is connected to the battery liquid cooling loop 400 or the electric drive liquid cooling loop 300. The first heater 201 is arranged to heat low-temperature water from the battery liquid cooling loop 400 or the electric drive liquid cooling loop 300. In this way, the temperature of the water entering the in-vehicle device 100 is equal to or higher than the dew point temperature, and the condensation phenomenon can be avoided.

[0086] In addition to the above, the device cooling system may further include a third temperature sensor. The third temperature sensor may be connected between the first heater 201 and the liquid inlet pipe 113, and the main controller is connected to the third temperature sensor. The main controller is configured to obtain a third temperature detected by the third temperature sensor, and control the first heater 201 to be turned on so that the third temperature is not below the dew point temperature.

[0087] The third temperature sensor may be arranged to monitor the temperature of the water entering the in-vehicle device 100 in real time, thereby ensuring that the temperature of the water entering the in-vehicle device 100 is equal to or higher than the dew point temperature, and avoiding the excessively high temperature of the water caused by the excessive heating power of the first heater 201 affecting the cooling efficiency and the operation reliability of the in-vehicle device 100.

[0088] In the above embodiment of the present application, the electric drive liquid cooling loop 300 may include a radiator 31, a first kettle 32, a first water pump 33, and a power train 34, which are in sequential communication with each other through a duct. A valve set may be connected between the first water pump 33 and the power train 34, so that the coolant entering the on-board device 100 is in a cold state.

[0089] The valve set, the first water pump 33 and the powertrain 34 may be connected through a three-way valve V1, and the first water pump 33 is connected to the inlet of the three-way valve V1. Heat generated by both the powertrain 34 and the in-vehicle device 100 is removed by the coolant and dissipated in the radiator 31. A first fan 36 may be further disposed near the radiator 31 to improve the heat dissipation efficiency of the radiator 31.

[0090] When the liquid outlet pipe 114 of the in-vehicle device 100 is connected to the electric drive liquid-cooling loop 300, the liquid outlet pipe 114 may be connected between the powertrain 34 and the radiator 31, or between the first water pump 33 and the powertrain 34. The connection position of the liquid outlet pipe 114 is downstream of the connection position of the valve set. Therefore, after the low-temperature coolant enters the in-vehicle device 100, it flows back to the electric drive liquid-cooling loop 300 and is cooled by the radiator 31.

[0091] The electric drive liquid cooling loop 300 may further include a second three-way solenoid valve 35. The inlet of the second three-way solenoid valve 35 is connected to the powertrain 34, and the two outlets of the second three-way solenoid valve 35 are respectively connected to the radiator 31 and the first kettle 32. When the heat generated by the powertrain 34 is low, the heat dissipation requirement can be met only through the coolant circulation, and the energy consumption can be reduced. In this case, the outlet of the second three-way solenoid valve 35, which is connected to the radiator 31, may be closed, and the outlet of the second three-way solenoid valve 35, which is connected to the first kettle 32, may be opened.

[0092] In the above embodiment of the present application, the battery liquid cooling loop 400 may include a compressor 41, a heat exchanger 42, a condenser 43, a second kettle 44, a second water pump 45, and a battery pack 46. The compressor 41, the heat exchanger 42, and the condenser 43 may be sequentially connected through a pipe to form a refrigerant loop. The second kettle 44, the second water pump 45, the heat exchanger 42, and the battery pack 46 may be sequentially connected through a pipe to form a coolant loop. Heat generated in the battery pack 46 may be removed by a coolant such as water, and the heat is exchanged in the heat exchanger 42, and the refrigerant is condensed in the condenser 43 for heat dissipation. A second fan 48 may be disposed near the condenser 43 to improve the heat dissipation efficiency of the condenser 43.

[0093] A valve set may be connected between the heat exchanger 42 and the battery pack 46, so that the coolant entering the in-vehicle device 100 is in a low temperature state. The valve set, the heat exchanger 42, and the battery pack 46 may be connected through a three-way valve V3, and the heat exchanger 42 is connected to the inlet of the three-way valve V3. When the liquid outlet pipe 114 of the in-vehicle device 100 is connected to the battery liquid cooling loop 400, the liquid outlet pipe 114 may be connected between the heat exchanger 42 and the battery pack 46 and located downstream of the connection position of the valve set, or may be connected between the battery pack 46 and the water pump 45, or may be connected between the water pump 45 and the heat exchanger 42. In this way, the low temperature coolant flows back to the battery liquid cooling loop 400 after entering the in-vehicle device 100, and is cooled by the heat exchanger 42.

[0094] In this embodiment of the present application, as shown in Figures 3 and 6, the liquid outflow pipe 114 is connected to the electric drive liquid cooling loop 300 or the battery liquid cooling loop 400. Compared with the solution in which a three-way valve is arranged, the solution in which the liquid outflow pipe 114 is simultaneously connected to the electric drive liquid cooling loop 300 and the battery liquid cooling loop 400 simplifies the pipe design.

[0095] Additionally, the circulating medium of the refrigerant loop may include, but is not limited to, refrigerants such as R134a refrigerant, R744 (carbon dioxide), R718 (water), R290 (propane), R717 (ammonia), R410a, R32, R1234yf, R502, R12, R22, R407c, and R600a, or a combination of any two or more of these refrigerants. The circulating medium of the coolant loop may include, but is not limited to, water, antifreeze, and ethylene glycol.

[0096] In addition to the above, the battery liquid cooling loop 400 may further include a second heater 47. The second heater 47 may be connected between the heat exchanger 42 and the battery pack 46, and a valve set may be connected between the second heater 47 and the battery pack 46. The second heater 47 is configured to heat the coolant to heat the battery pack 46 when the temperature is low in winter, thereby preventing the operation of the battery pack 46 from being affected by low temperatures.

[0097] The second heater 47 may be set to a PTC heater. It is obvious that the period when the temperature is low is the winter season when the second heater 47 is turned on, and when the ambient temperature is high, the first heater 201 is turned on. In addition, the heating power of the second heater 47 is much larger than that of the first heater 201. Therefore, the second heater 47 cannot replace the first heater 201 in terms of function.

[0098] In the above embodiment of the present application, it should be noted that in addition to the domain controller (which may also be referred to as an in-vehicle mobile data center MDC), the in-vehicle device 100 to which the device cooling system is applied may be a device such as an on-board charger or an electronic control unit ECU.

[0099] It is understood that the device cooling system may have one, two or even multiple on-vehicle devices 100. In the embodiment provided in the above attached drawings, there is one on-vehicle device 100. Meanwhile, when there are multiple on-vehicle devices 100, each on-vehicle device 100 can be arranged to have an electric drive liquid-cooled by arranging a valve set. loop and battery liquid cooling loop Alternatively, multiple on-board devices 100 may be directly connected in series and considered as one unit. By arranging only one valve set, all on-board devices can be liquid-cooled for electric drives. loop and battery liquid cooling loop By connecting it to the piping, the pipeline is simplified.

[0100] In addition to the above, it should be further noted that the embodiment of the present application is not limited to a specific type and location of a main controller configured to control the device cooling system. The main controller may be a controller included in the in-vehicle device 100, or may be a vehicle control unit (VCU).

[0101] 8 is an operation flowchart of the main controller of the device cooling system according to an embodiment of the present application. As shown in FIG. 8, an example of the operation procedure of the main controller of the device cooling system provided in this embodiment of the present application may be such that the main controller first calculates the dew point temperature of the in-vehicle device 100 based on the temperature and humidity detected by the temperature and humidity detection device, obtains the first temperature detected by the first temperature sensor and the second temperature detected by the second temperature sensor, compares the dew point temperature, the first temperature and the second temperature, and then determines whether both the first temperature and the second temperature are equal to or higher than the dew point temperature. If the determined result is such that both the first temperature and the second temperature are equal to or higher than the dew point temperature, the main controller controls to connect a path corresponding to the lower temperature of the first temperature and the second temperature, or if the determined result is such that at least one of the first temperature and the second temperature is equal to or higher than the dew point temperature, the main controller continues to determine whether either the first temperature or the second temperature is equal to or higher than the dew point temperature. If the determined result is that either the first temperature or the second temperature is equal to or higher than the dew point temperature, the main controller controls to connect a path corresponding to the higher of the first temperature and the second temperature, or if the determined result is that neither the first temperature nor the second temperature is equal to or higher than the dew point temperature, the main controller controls the first heater 201 to be turned on, thereby determining whether the third temperature detected by the third temperature sensor is equal to or higher than the dew point temperature.

[0102] Generally speaking, the main controller may control the in-vehicle device 100 to be connected to the battery liquid cooling loop 400 or the electric drive liquid cooling loop 300 based on the relationship between the first temperature, the second temperature and the dew point temperature, and may control the first heater 201 to be turned on. In this way, the temperature of the water entering the in-vehicle device 100 is always equal to or higher than the dew point temperature, thereby avoiding the condensation phenomenon.

[0103] According to the device cooling system provided in this embodiment of the present application, a temperature and humidity detection device is disposed in the vehicle-mounted device to obtain the dew point temperature of the air in the vehicle-mounted device, and the vehicle-mounted device is connected to the electric drive liquid cooling loop and the battery liquid cooling loop using a valve set, and the valve set switches to enable the vehicle-mounted device to be connected to the electric drive liquid cooling loop or the battery liquid cooling loop. In this way, the temperature of the coolant entering the vehicle-mounted device is always equal to or higher than the dew point temperature of the air in the vehicle-mounted device. This can avoid the condensation phenomenon occurring in the vehicle-mounted device, effectively prevent the reliability and safety problems caused by corrosion and short circuit occurring in the vehicle-mounted device, and improve the operating stability and reliability of the product. In addition, on the premise that the condensation prevention conditions are met, the vehicle-mounted device can always be at the minimum operating temperature. This can improve the reliability and reduce the failure rate of the vehicle-mounted device.

[0104] An embodiment of the present application further provides a thermal management system, which may include the electric drive liquid cooling loop, the battery liquid cooling loop and the device cooling system provided in the above embodiments.

[0105] In the thermal management system of the embodiment of the present application, the electric drive liquid cooling loop and the battery liquid cooling loop are arranged to cool the two main heat generating devices, namely the powertrain and the battery pack, respectively. In addition, the on-board device may be connected to the electric drive liquid cooling loop or the battery liquid cooling loop under the control of the main controller. In this way, the liquid cooling of the on-board device can be implemented, and the condensation phenomenon of the on-board device can be avoided.

[0106] The device cooling system provided in the above embodiment of the present application is applied to a vehicle thermal management system, and uses an electric drive liquid cooling loop and a battery liquid cooling loop to cool an on-board device. In addition, the embodiment of the present application may further provide a device cooling system that can be applied to fields such as power systems and data centers.

[0107] FIG. 9 is another schematic diagram of a device cooling system according to an embodiment of the present application. As shown in FIG. 9, the present embodiment of the present application further provides a device cooling system that can be applied to a thermal management system including two or more liquid cooling loops. The thermal management system may include a first liquid cooling loop 51 and a second liquid cooling loop 52. The cooling temperature of the coolant in the first liquid cooling loop 51 exceeds the cooling temperature of the coolant in the second liquid cooling loop 52. The device cooling system may include a device to be cooled 53, a main controller, and a valve set 54. A liquid inlet pipe of the device to be cooled 53 communicates with the valve set 54, and the valve set 54 is connected to the first liquid cooling loop 51 to form a first path, and the valve set 54 is connected to the second liquid cooling loop 52 to form a second path. The valve set 54 is configured to control a switch state to connect the first path or the second path. A liquid outlet pipe of the device to be cooled 53 is connected to the first liquid cooling loop and the second liquid cooling loop. A temperature and humidity detection device is disposed in the device to be cooled 53, and a main controller is individually connected to the temperature and humidity detection device and the valve set 54. The main controller is configured to obtain a dew point temperature based on the temperature and humidity detected by the temperature and humidity detection device, and to control the valve set 54 to change the switch state based on the dew point temperature.

[0108] For example, the device cooling system is applied to a power system, where the first liquid cooling loop 51 and the second liquid cooling loop 52 may be liquid cooling loops connected to large electrical devices such as energy storage batteries and transformers, and the device to be cooled 53 may be a small device such as a domain controller of the power system.

[0109] For example, the device cooling system is applied to a data center. The first liquid cooling loop 51 and the second liquid cooling loop 52 may be used to cool servers in different equipment rooms or different areas, respectively, to meet different cooling requirements of different servers. The device 53 to be cooled may be a data center that monitors the equipment rooms, etc.

[0110] In the deployed device cooling system, a temperature and humidity detection device is disposed in the device to be cooled to obtain the dew point temperature of the air in the device to be cooled, and the device to be cooled is connected to a first liquid cooling loop and a second liquid cooling loop by using a valve set, and the valve set switches to allow the device to be cooled to be connected to the first liquid cooling loop or the second liquid cooling loop. In this way, the temperature of the coolant entering the device to be cooled is always equal to or higher than the dew point temperature of the air in the device to be cooled. This can avoid the condensation phenomenon occurring in the device to be cooled, effectively prevent the reliability and safety problems caused by corrosion and short circuit occurring in the device to be cooled, and improve the overall stability and reliability of the system.

[0111] In the description of the embodiments of the present application, it should be noted that the terms "installation", "interconnection" and "connection" should be understood in a broad sense unless otherwise specified and limited. For example, "connection" may be a fixed connection, an indirect connection through an intermediate medium, a communication within two elements, or an interactive relationship between two elements. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific examples.

[0112] As used herein, the terms "first," "second," "third," "fourth," etc. (when present in a sentence) in the embodiments of the present application are intended to distinguish between similar items and do not necessarily indicate a particular order or arrangement.

[0113] In addition to the above, the terms "include" and "have" and any other variations thereof are intended to cover inclusive examples of enumerated items, such as a process, method, system, product, or device that includes a list of steps or portions is not necessarily limited to those explicitly recited steps or portions, but may include other steps or portions that are not explicitly recited or that are not inherent to the process, method, product, or device.

[0114] Finally, it should be noted that the above embodiments are only intended to describe the technical solutions of the embodiments of the present application, rather than limiting the embodiments of the present application. Although the embodiments of the present application have been described in detail with reference to the above embodiments, those skilled in the art will naturally understand that the technical solutions described in the above embodiments can be modified, or equivalent substitutions can be made for part or all of the technical features, without departing from the scope of the technical solutions of the embodiments of the present application. [Explanation of symbols]

[0115] 100 In-vehicle devices 11. Housing 111 Upper housing 112 Lower housing 113 Liquid inlet pipe 114 Liquid Outflow Pipe 12 Mainboard 13 Connectors 200 1st 3-way solenoid valve 201 First Heater 202 First 2-way solenoid valve 203 Second 2-way solenoid valve 300 Electric drive liquid cooling loop 31 Radiator 32 The First Kettle 33 First Water Pump 34 Powertrain 35 Second 3-way solenoid valve 36 The First Fan 400 Battery Liquid Cooling Loop 41 Compressor 42 Heat exchanger 43 Capacitor 44 Second Kettle 45 Second Water Pump 46 Battery Pack 47 Second Heater 48 Second Fan

Claims

1. A device cooling system applied to a thermal management system, the thermal management system including an electric drive liquid cooling loop and a battery liquid cooling loop, the device cooling system including an on-board device, a main controller, and a valve set; A liquid inlet pipe and a liquid outlet pipe are arranged in the on-board device, the liquid inlet pipe is in communication with the valve set, the valve set is connected to the electric drive liquid cooling loop to form a first path, the valve set is connected to the battery liquid cooling loop to form a second path, the valve set is configured to control a switch state to connect the first path or the second path, and the liquid outlet pipe is connected to the electric drive liquid cooling loop or the battery liquid cooling loop; A device cooling system, comprising: a temperature and humidity detection device disposed in the in-vehicle device; a main controller individually connected to the temperature and humidity detection device and the valve set; and the main controller configured to obtain a dew point temperature based on the temperature and humidity detected by the temperature and humidity detection device, and to control the valve set to switch the switch state based on the dew point temperature.

2. a first temperature sensor is disposed between the electric drive liquid cooling loop and the valve set, and a second temperature sensor is disposed between the battery liquid cooling loop and the valve set; 2. The device cooling system of claim 1, wherein the main controller is individually connected to the first temperature sensor and the second temperature sensor, and the main controller is configured to acquire a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor, compare the dew-point temperature, the first temperature, and the second temperature, and, when both the first temperature and the second temperature are equal to or higher than the dew-point temperature, control to connect a path corresponding to a lower temperature of the first temperature and the second temperature, or, when either the first temperature or the second temperature is equal to or higher than the dew-point temperature, control to connect a path corresponding to a higher temperature of the first temperature and the second temperature.

3. 3. The device cooling system of claim 2, further comprising a first heater, the first heater connected between the valve set and the liquid inlet pipe, the main controller connected to the first heater, and the main controller configured to control the first heater to be turned on when both the first temperature and the second temperature are less than the dew point temperature.

4. 4. The device cooling system of claim 3, further comprising a third temperature sensor, the third temperature sensor being connected between the first heater and the liquid inlet pipe, the third temperature sensor being connected to the main controller, and the main controller being configured to obtain a third temperature detected by the third temperature sensor and control the first heater to be turned on so that the third temperature does not become less than the dew point temperature.

5. 5. The device cooling system of claim 1, wherein the valve set includes a first three-way solenoid valve, the liquid inlet pipe is connected to an outlet of the first three-way solenoid valve, the electric drive liquid cooling loop is connected to a first inlet of the first three-way solenoid valve, and the battery liquid cooling loop is connected to a second inlet of the first three-way solenoid valve.

6. 5. The device cooling system of claim 1, wherein the valve set comprises a first two-way solenoid valve and a second two-way solenoid valve, the first two-way solenoid valve being connected between the electric drive liquid cooling loop and the liquid inlet pipe, and the second two-way solenoid valve being connected between the battery liquid cooling loop and the liquid inlet pipe.

7. The device cooling system according to claim 1 , wherein the in-vehicle device comprises a housing and a main board arranged in the housing, the housing comprises a cold / hot plate, and the liquid inlet pipe and the liquid outlet pipe are arranged on the cold / hot plate.

8. 8. A device cooling system as described in any one of claims 1 to 7, wherein the electric drive liquid cooling loop comprises a radiator, a first kettle, a first water pump and a power train, which are sequentially connected through a pipe, and the valve set is connected between the first water pump and the power train.

9. 9. The device cooling system of claim 8, wherein the electric drive liquid cooling loop further comprises a second three-way solenoid valve, an inlet of the second three-way solenoid valve being connected to the power train, and two outlets of the second three-way solenoid valve being connected to the radiator and the first kettle, respectively.

10. 10. The device cooling system of claim 1, wherein the battery liquid cooling loop comprises a compressor, a heat exchanger, a condenser, a second kettle, a second water pump and a battery pack, the compressor, the heat exchanger and the condenser being sequentially connected through a pipe to form a refrigerant loop, the second kettle, the second water pump, the heat exchanger and the battery pack being sequentially connected through a pipe to form a coolant loop, and the valve set being connected between the heat exchanger and the battery pack.

11. 11. The device cooling system of claim 10, wherein the battery liquid cooling loop further comprises a second heater, the second heater connected between the heat exchanger and the battery pack, and the valve set connected between the second heater and the battery pack.

12. A thermal management system comprising: an electric drive liquid cooling loop; a battery liquid cooling loop; and a device cooling system according to any one of claims 1 to 11.

13. 1. A method for controlling a device cooling system, comprising: acquiring temperature information and humidity information detected by a temperature and humidity detection device of an in-vehicle device, and calculating a dew point temperature based on the temperature information and the humidity information; determining whether the dew point temperature falls within a first interval or a second interval; controlling a valve set to switch to open a first path when the dew point temperature is within the first interval, the first path connecting the on-board device with an electric drive liquid cooling loop; or and controlling a valve set to switch to open a second path when the dew point temperature belongs to the second interval, the second path connecting the on-board device to a battery liquid cooling loop.

14. The step of determining whether the dew point temperature belongs to a first interval or a second interval includes: A step of acquiring a first temperature detected by a first temperature sensor and a second temperature detected by a second temperature sensor, the first temperature being a liquid inlet temperature of the first path and the second temperature being a liquid inlet temperature of the second path; comparing the dew point temperature, the first temperature, and the second temperature; When the dew-point temperature is equal to or lower than either the first temperature or the second temperature, determining that the dew-point temperature belongs to the first interval when the first temperature exceeds the second temperature, or determining that the dew-point temperature belongs to the second interval when the first temperature is lower than the second temperature; or 14. The method of claim 13, particularly comprising the step of: determining that the dew point temperature belongs to the second interval when the first temperature exceeds the second temperature, or determining that the dew point temperature belongs to the first interval when the first temperature is less than the second temperature, when the dew point temperature is less than both the first temperature and the second temperature.

15. 15. The method of controlling a device cooling system of claim 14, further comprising the steps of: determining whether the dew point temperature belongs to a third interval; and, if the dew point temperature belongs to the third interval, controlling a first heater to be turned on, the first heater being disposed between the valve set and the on-board device.

16. The step of determining whether the dew point temperature belongs to a third interval includes:

16. The method of controlling a device cooling system of claim 15, particularly comprising the step of comparing the dew point temperature, the first temperature and the second temperature, and determining that the dew point temperature belongs to the third interval if the dew point temperature exceeds both the first temperature and the second temperature.

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