Thermal management system of battery, control method of thermal management system and vehicle

Abstract

The invention provides a thermal management system of a battery, a control method of the thermal management system and a vehicle. The system comprises a battery direct cooling loop, a uniform temperature loop and a battery heating loop, wherein the battery direct cooling loop is formed by communicating a refrigerant flow channel with a refrigerant refrigerating system; the uniform-temperature loop is formed by communicating a cooling liquid flow channel with a battery water pump; and the battery heating loop is formed by communicating the cooling liquid flow channel with the battery water pump and then communicating with at least one of the PTC heating system, the engine waste heat recovery system and the motor liquid cooling system. According to the heat management system, the double-medium cold plate is arranged on the battery module, the battery can be cooled through a refrigerant refrigerating system of the vehicle, the battery module can be heated through waste heat generated when an engine and a motor of the vehicle work, a battery heating film is omitted, the effect of reducing cost and weight of the whole vehicle is achieved, and the service life of the vehicle is prolonged. Meanwhile, rapid temperature equalization can be carried out on the battery cells through the temperature equalization loop, and the problem that the temperature difference of the battery cells is large during refrigerant cooling is solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal management, and in particular to a battery thermal management system and a control method thereof, and a vehicle. Background Art

[0002] The refrigerant direct cooling system is an advanced battery cooling technology that achieves efficient cooling of the battery by directly introducing the refrigerant into the battery pack for heat exchange. This technology can quickly and effectively remove the heat generated by the battery through the phase change reaction of the refrigerant, thereby improving the efficiency and life of the battery, and has been widely used in electric vehicles and energy storage systems.

[0003] However, refrigerant cooling technology also has certain disadvantages. This technology consumes a lot of energy and may cause large temperature differences in the battery cells due to low refrigerant temperature, insufficient refrigerant flow, etc. Moreover, refrigerant technology can only cool the battery. When the battery needs to be heated, it is usually necessary to install an additional electric heating film on the power battery for heating, which makes the battery thermal management system consume more energy. Summary of the invention

[0004] The present application provides a battery thermal management system and a control method thereof, and a vehicle, so as to solve the problems of high energy consumption and large temperature difference of battery cells in the battery thermal management system.

[0005] In a first aspect, the present application provides a battery thermal management system, comprising: a battery direct cooling circuit, a temperature equalizing circuit, and a battery heating circuit;

[0006] The battery direct cooling circuit includes a dual-medium cold plate and a refrigerant refrigeration system; the dual-medium cold plate is arranged at the battery module, including a refrigerant flow channel and a coolant flow channel; the temperature equalization circuit includes the dual-medium cold plate and a battery water pump; the battery heating circuit includes the battery water pump, the dual-medium cold plate, a PTC heating system, an engine waste heat recovery system and a motor liquid cooling system;

[0007] The refrigerant flow channel is connected to the refrigerant refrigeration system to form the battery direct cooling circuit;

[0008] The coolant flow channel is connected to the battery water pump to form the temperature equalization circuit;

[0009] After the coolant flow channel is connected to the battery water pump, it is connected to at least one of the PTC heating system, the engine waste heat recovery system and the motor liquid cooling system to form the battery heating circuit.

[0010] The thermal management system provided in this embodiment can cool the battery through the vehicle's refrigerant refrigeration system by setting a dual-medium cold plate on the battery module, and can heat the battery module through the vehicle's engine, PTC heat generation, and waste heat from the motor. The battery heating film is omitted, achieving the effect of reducing the cost and weight of the entire vehicle. At the same time, the battery cells can be quickly equalized in temperature through the temperature equalization circuit, avoiding the problem of large temperature differences in the battery cells during refrigerant cooling.

[0011] In a possible implementation, the motor liquid cooling system includes a motor system, a motor water pump and a radiator; the thermal management system also includes a battery liquid cooling circuit; the battery liquid cooling circuit includes the battery water pump, the dual-medium cold plate and a four-way valve;

[0012] In the battery liquid cooling circuit, the first end of the motor water pump is communicated with the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator, the second end of the radiator is communicated with the first end of the four-way valve, the second end of the four-way valve is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump, the second end of the battery water pump is communicated with the third end of the four-way valve, and the fourth end of the four-way valve is communicated with the second end of the motor water pump;

[0013] When the battery liquid cooling circuit is working, the coolant flows into the coolant flow channel after dissipating heat through the radiator to dissipate heat for the battery module.

[0014] In this embodiment, the coolant flow channel in the dual-medium cold plate is connected to the battery liquid cooling system into a loop through a four-way valve, and the radiator of the motor liquid cooling system can be used to dissipate heat from the battery module, thereby achieving energy saving and temperature equalization.

[0015] In a possible implementation, the battery heating circuit includes a first battery heating circuit; the motor liquid cooling system includes a motor system, a motor water pump and a radiator; the first battery heating circuit also includes a four-way valve;

[0016] In the first battery heating circuit, the first end of the motor water pump is communicated with the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator, the second end of the radiator is communicated with the first end of the four-way valve, the second end of the four-way valve is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump, the second end of the battery water pump is communicated with the third end of the four-way valve, and the fourth end of the four-way valve is communicated with the second end of the motor water pump;

[0017] When the first battery heating circuit is working, the radiator is not working, and the coolant flows into the coolant channel after being heated by the motor system to heat the battery module.

[0018] In this embodiment, the motor liquid cooling system and the coolant flow channel are connected to form a loop through a four-way valve to form a first battery heating loop, so that the battery module can be heated by the active heat generation or waste heat of the motor system, omitting the heating film structure to achieve the effect of reducing energy consumption.

[0019] In a possible implementation, the battery heating circuit includes a second battery heating circuit; the PTC heating system includes a PTC heater, a first water pump, a first three-way valve and a second three-way valve;

[0020] In the second battery heating circuit, the second end of the first water pump is connected to the first end of the PTC heater, the second end of the PTC heater is connected to the first end of the first three-way valve, the second end of the first three-way valve is connected to the first end of the coolant flow channel, the second end of the coolant flow channel is connected to the first end of the battery water pump, the second end of the battery water pump is connected to the first end of the second three-way valve, the second end of the second three-way valve is connected to the first end of the first water pump; the third end of the first three-way valve is connected to the first end of the second three-way valve.

[0021] In this embodiment, the coolant flow channel is connected to the PTC heating system through the first three-way valve and the second three-way valve, and the battery module can be heated by the PTC heating system, thereby omitting the heating film structure and achieving the effect of reducing energy consumption.

[0022] In a possible implementation, the battery heating circuit includes a third battery heating circuit; the engine waste heat recovery system includes an engine and an engine water pump;

[0023] In the third battery heating circuit, the second end of the first water pump is communicated with the first end of the PTC heater, the second end of the PTC heater is communicated with the first end of the first three-way valve, the second end of the first three-way valve is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump, the second end of the battery water pump is communicated with the first end of the second three-way valve, and the third end of the second three-way valve is communicated with the first end of the engine water pump; the second end of the engine water pump is communicated with the first end of the circulating fluid pipeline of the engine, and the second end of the circulating fluid pipeline of the engine is communicated with the first end of the first water pump.

[0024] This embodiment connects the coolant flow channel with the engine waste heat recovery system through the first three-way valve and the second three-way valve, and can heat the battery module through the waste heat of the engine waste heat recovery system, thereby omitting the heating film structure and achieving the effect of reducing energy consumption.

[0025] In a possible implementation, the refrigerant refrigeration circuit includes an evaporator, a compressor and a condenser;

[0026] In the battery direct cooling circuit, the first end of the refrigerant flow channel is connected to the first end of the condenser and the first end of the evaporator respectively, the second end of the refrigerant flow channel and the second end of the evaporator are both connected to the first end of the compressor, and the second end of the compressor is connected to the second end of the condenser.

[0027] This embodiment can achieve rapid cooling of the battery module through the battery direct cooling circuit.

[0028] In a second aspect, the present application provides a control method for a battery thermal management system, which is applied to the battery thermal management system as described in the first aspect, and the method includes:

[0029] When the temperature of the battery module of the vehicle is greater than a first preset temperature, the battery direct cooling circuit is controlled to operate; and when the battery direct cooling circuit is operating, if it is monitored that the temperature of the battery module of the vehicle does not meet the preset temperature condition, the temperature equalization circuit is controlled to operate;

[0030] When the temperature of the battery module is lower than a second preset temperature, controlling the battery heating circuit to operate;

[0031] Wherein, the first preset temperature is greater than the second preset temperature.

[0032] The control method of the thermal management system provided in this embodiment selects the battery direct cooling circuit to work when the battery has a cooling demand, which can achieve a rapid cooling effect. At the same time, a temperature equalization circuit is used to solve the problem of large temperature difference of battery cells in the battery direct cooling circuit. When the battery has a heating demand, the coolant flow channel of the dual-medium cold plate is connected with the vehicle's engine, motor system, and PTC heating system. The battery module can be heated by the waste heat of the vehicle's engine and motor when they are working, and the battery heating film is omitted, thereby achieving the effect of reducing the cost and weight of the entire vehicle.

[0033] In a possible implementation, the temperature of the battery module includes a maximum battery cell temperature; when the temperature of the battery module of the vehicle is greater than a first preset temperature, controlling the battery direct cooling circuit to operate includes:

[0034] When the highest battery cell temperature is greater than the first preset temperature, if the motor temperature is greater than the target temperature, the battery direct cooling circuit is controlled to operate; the motor temperature is the temperature of the coolant flowing through the motor system.

[0035] This embodiment determines whether the motor liquid cooling system can meet the battery cooling demand by monitoring the motor temperature, and adopts the battery direct cooling circuit to work when the battery cooling demand is not met, thereby achieving the effect of rapid cooling of the battery module.

[0036] In a possible implementation, when the temperature of the battery module of the vehicle is greater than a first preset temperature, the method further includes:

[0037] When the highest battery cell temperature is greater than a first preset temperature, if the motor temperature is less than or equal to a target temperature, the battery liquid cooling circuit is controlled to operate.

[0038] This embodiment determines whether the motor liquid cooling system can meet the battery cooling demand by monitoring the motor temperature, and uses the battery liquid cooling circuit to work when the battery cooling demand is met, thereby achieving the effect of reducing energy consumption.

[0039] In a possible implementation, the temperature of the battery module includes a minimum battery cell temperature; the second preset temperature includes a first temperature value and a second temperature value; and the first temperature value is less than the second temperature value;

[0040] When the temperature of the battery module is lower than a second preset temperature, controlling the battery heating circuit to operate includes:

[0041] If the battery module is in a discharging state, the lowest battery cell temperature is lower than the first temperature value, the motor temperature is lower than a third preset temperature, and the difference between the motor temperature and the lowest battery cell temperature is not lower than the first temperature difference, the first battery heating circuit is controlled to operate; the motor temperature is the temperature of the coolant flowing through the motor system;

[0042] If the battery module is in a charging state and the lowest battery cell temperature is lower than the second temperature value, controlling the second battery heating circuit to operate;

[0043] If the battery module is in a discharging state, the minimum battery cell temperature is less than the first temperature value, and the engine temperature is within a preset engine temperature range, the third battery heating circuit is controlled to operate; the engine temperature is the temperature of the coolant flowing through the engine.

[0044] This embodiment provides a first battery heating circuit, a second battery heating circuit and a third battery heating circuit, thereby being able to meet the battery heating requirements when the battery module is in different states, and using engine waste heat, motor waste heat and PTC waste heat to heat the battery, thereby achieving the effect of saving energy.

[0045] In a possible implementation, the temperature of the battery module includes a maximum battery cell temperature and a minimum battery cell temperature; when the battery direct cooling circuit is working, if it is monitored that the temperature of the battery module of the vehicle does not meet a preset temperature condition, the temperature equalization circuit is controlled to work, including:

[0046] When the battery direct cooling circuit is working, if it is monitored that the difference between the highest battery cell temperature and the lowest battery cell temperature is greater than the second temperature difference, the temperature equalizing circuit is controlled to work; if it is monitored that the battery module has a thermal runaway fault, the temperature equalizing circuit is controlled to work, and the battery direct cooling circuit is controlled to stop working.

[0047] In this embodiment, when the temperature difference of the battery cells is too large, the battery direct cooling circuit and the temperature equalization circuit are controlled to work simultaneously, so as to achieve the effect of rapid temperature reduction of the battery module. When the battery module has thermal runaway, the battery direct cooling circuit is controlled to stop working, so as to ensure the safe and stable operation of the battery thermal management system.

[0048] In a third aspect, an embodiment of the present application provides a vehicle, which includes the thermal management system of the vehicle as described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 is a schematic diagram of the structure of a thermal management system for a battery provided in an embodiment of the present application;

[0051] Figure 2 is a flow chart for implementing a control method of a battery thermal management system provided in an embodiment of the present application;

[0052] Figure 3 is a schematic diagram of a controller provided in an embodiment of the present application;

[0053] superior Figure 1 The meanings of the reference numerals in the figure are as follows:

[0054] 1. Low-temperature radiator; 2. Condenser; 3. High-temperature radiator; 4. Fan; 5. Overflow tank; 6. Motor water pump; 7. OBC, PDU and DCDC rectifier circuit; 8. Temperature sensor; 9. Motor; 10. First solenoid valve; 11. Dual-medium cold plate; 12. Battery module; 14. Temperature and pressure sensor; 15. Second solenoid valve; 16. Evaporator; 17. Compressor; 18. First water pump; 19. PTC heater; 20. Warm air core; 21. Overflow tank; 22. Second three-way valve; 23. Thermostat; 24. Engine; 25. Engine water pump; 26. Overflow tank; 27. Voltage sensor; 28. Four-way valve; 29. ​​Battery water pump; 30. First three-way valve. DETAILED DESCRIPTION

[0055] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0056] In order to make the purpose, technical solutions and advantages of the present application clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0057] Figure 1 This is a schematic diagram of the structure of the thermal management system of the battery provided in the embodiment of the present application. Figure 1 As shown, the thermal management system of the battery includes: a battery direct cooling circuit, a temperature equalizing circuit and a battery heating circuit;

[0058] The battery direct cooling circuit includes a dual-medium cold plate and a refrigerant refrigeration system; the dual-medium cold plate is arranged at the battery module 12, including a refrigerant flow channel and a coolant flow channel; the temperature equalization circuit includes the dual-medium cold plate 11 and a battery water pump; the battery heating circuit includes the battery water pump, the dual-medium cold plate 11, a PTC heating system, an engine waste heat recovery system and a motor liquid cooling system;

[0059] The refrigerant flow channel is connected to the refrigerant refrigeration system to form the battery direct cooling circuit;

[0060] The coolant flow channel is connected to the battery water pump to form the temperature equalization circuit;

[0061] After the coolant flow channel is connected to the battery water pump, it is connected to at least one of the PTC (Positive Temperature Coefficient) heating system, the engine waste heat recovery system and the motor liquid cooling system to form the battery heating circuit.

[0062] In this embodiment, the dual-medium cold plate 11 can be arranged on the upper side or the lower side of the battery module 12, and a refrigerant flow channel and a coolant flow channel are arranged inside the dual-medium cold plate 11. The refrigerant flow channel includes a main refrigerant flow channel and multiple refrigerant branches; each refrigerant branch is connected to the main refrigerant flow channel, and the coolant flow channel includes a main coolant flow channel and multiple coolant branches, and each coolant branch is connected to the main coolant flow channel; multiple refrigerant branches and coolant branches are staggered to improve the heat exchange efficiency between the refrigerant branches and the coolant branches.

[0063] Specifically, both ends of the refrigerant flow channel in the dual-medium cold plate 11 are connected to the refrigerant refrigeration system of the vehicle. Both ends of the coolant flow channel in the dual-medium cold plate 11 can be connected to at least one of the motor liquid cooling system, the PTC heating system, and the engine waste heat recovery system, and the coolant can be heated by the heat generated by the motor system in the motor liquid cooling system, the engine waste heat, and the PTC heat generation to achieve heating of the battery module 12.

[0064] In this embodiment, the dual-medium cold plate 11 can not only use refrigerant to dissipate heat from the battery module 12, but also can be connected to the motor system, engine waste heat recovery system, and PTC heating system through the coolant flow channel of the dual-medium cold plate 11 when the battery module 12 is in a low-temperature environment, and the motor waste heat, engine waste heat and PTC heat generation are used to heat the battery, omitting the electric heating film structure, achieving the purpose of reducing the cost and weight of the whole vehicle, and saving the energy consumption of the thermal management system. In addition, when the difference between the highest temperature and the lowest temperature of the battery cell in the battery module 12 is large, this embodiment can use the battery direct cooling circuit and the temperature equalization circuit to work simultaneously to achieve rapid temperature equalization of the battery module 12.

[0065] In a possible implementation, the motor liquid cooling system includes a motor system, a motor water pump 6 and a radiator; the thermal management system also includes a battery liquid cooling circuit; the battery liquid cooling circuit includes the battery water pump, the dual-medium cold plate and a four-way valve 28;

[0066] In the battery liquid cooling circuit, the first end of the motor water pump 6 is communicated with the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator, the second end of the radiator is communicated with the first end of the four-way valve 28, the second end of the four-way valve 28 is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump 29, the second end of the battery water pump 29 is communicated with the third end of the four-way valve 28, and the fourth end of the four-way valve 28 is communicated with the second end of the motor water pump 6;

[0067] When the battery liquid cooling circuit is working, the coolant flows into the coolant flow channel after dissipating heat through the radiator to dissipate heat for the battery module 12 .

[0068] In this embodiment, the dual-medium cold plate 11 can use refrigerant to dissipate heat from the battery module 12, and can also use coolant to dissipate heat and heat the battery module 12. In addition, when the temperature of the battery module 12 is high, the battery direct cooling circuit can be used to dissipate heat from the battery, thereby achieving rapid heat dissipation of the battery module 12. When the temperature of the battery module 12 is not too high, the battery liquid cooling circuit can be used to dissipate heat from the battery, thereby achieving the effect of saving energy consumption.

[0069] like Figure 1 As shown, the motor system includes an OBC (On board charger), a motor, a PDU (Power Distribution Unit) and a DCDC rectifier circuit 7; the radiator in the motor liquid cooling system is a low-temperature radiator; the motor liquid cooling system also includes an overflow tank 5 and a temperature sensor, and (OBC, PDU, DCDC rectifier circuit) 6, a motor 8, a low-temperature radiator 1, an overflow tank 5 and a motor water pump 6 are connected in series to form a loop.

[0070] Specifically, the battery liquid cooling circuit also includes a first three-way valve 30. In the battery liquid cooling circuit, the first end of the motor water pump 6 is connected to the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is connected to the first end of the low-temperature radiator 1, the second end of the low-temperature radiator 1 is connected to the first end of the overflow tank 5, the second end of the overflow tank 5 is connected to the first end of the four-way valve 28, the fourth end of the four-way valve 28 is connected to the second end of the motor water pump 6, the second end of the four-way valve 28 is connected to the third end of the first three-way valve 30, the second end of the first three-way valve 30 is connected to the first end of the coolant flow channel, the second end of the coolant flow channel is connected to the first end of the battery water pump 29, and the second end of the battery water pump 29 is connected to the third end of the four-way valve 28. A temperature sensor 8 is provided on the circulating liquid pipeline between the DCDC rectifier circuit in the motor system and the motor.

[0071] In this embodiment, the coolant flow direction of the battery liquid cooling circuit is as follows: the coolant flows out from the motor water pump 6, flows through the motor system, the low-temperature radiator 1, the overflow tank 5, the first end of the four-way valve 28, the second end of the four-way valve 28, and the first three-way valve 30, and then enters the coolant flow channel. After flowing out of the coolant flow channel, it passes through the battery water pump 29, the third end of the four-way valve 28, and the fourth end of the four-way valve 28 and then returns to the motor water pump 6.

[0072] In another possible embodiment, the positions of the four-way valve 28 and the motor water pump 6 in the circuit can be interchanged. Specifically, in the battery liquid cooling circuit, the first end of the motor water pump 6 is connected to the second end of the radiator, the second end of the motor water pump 6 is connected to the first end of the four-way valve 28, the fourth end of the four-way valve 28 is connected to the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is connected to the first end of the radiator, the second end of the four-way valve 28 is connected to the first end of the coolant flow channel, the second end of the coolant flow channel is connected to the first end of the battery water pump 29, and the second end of the battery water pump 29 is connected to the third end of the four-way valve 28.

[0073] The overflow tank 5 is connected in series between the motor water pump 6 and the radiator, and a temperature sensor is provided on the circulating fluid pipeline between the DCDC rectifier circuit in the motor system and the motor.

[0074] In this embodiment, the coolant flow direction of the battery liquid cooling circuit is as follows: the coolant flows out from the motor water pump 6, flows through the first end of the four-way valve 28, the second end of the four-way valve 28, and then enters the coolant flow channel to cool the battery module 12. After flowing out from the coolant flow channel, it passes through the battery water pump 29, the third end of the four-way valve 28, the fourth end of the four-way valve 28, and the motor system and then enters the low-temperature radiator 1. After the low-temperature radiator 1 cools the coolant, it returns to the motor water pump 6.

[0075] In a possible implementation, the battery heating circuit includes a first battery heating circuit; the motor liquid cooling system includes a motor system, a motor water pump 6 and a radiator; the first battery heating circuit also includes a four-way valve 28;

[0076] In the first battery heating circuit, the first end of the motor water pump 6 is communicated with the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator, the second end of the radiator is communicated with the first end of the four-way valve 28, the second end of the four-way valve 28 is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump 29, the second end of the battery water pump 29 is communicated with the third end of the four-way valve 28, and the fourth end of the four-way valve 28 is communicated with the second end of the motor water pump 6;

[0077] When the first battery heating circuit is working, the radiator is not working, and the coolant flows into the coolant flow channel after being heated by the battery system to heat the battery module 12 .

[0078] In this embodiment, the first battery heating circuit further includes a first three-way valve 30. In the first battery heating circuit, the first end of the motor water pump 6 is connected to the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is connected to the first end of the low-temperature radiator 1, the second end of the low-temperature radiator 1 is connected to the first end of the overflow tank 5, the second end of the overflow tank 5 is connected to the first end of the four-way valve 28, the fourth end of the four-way valve 28 is connected to the second end of the motor water pump 6, the second end of the four-way valve 28 is connected to the third end of the first three-way valve 30, the second end of the first three-way valve 30 is connected to the first end of the coolant flow channel, the second end of the coolant flow channel is connected to the first end of the battery water pump 29, and the second end of the battery water pump 29 is connected to the third end of the four-way valve 28. A temperature sensor is provided on the circulating liquid pipeline between the DCDC rectifier circuit in the motor system and the motor.

[0079] In this embodiment, the coolant flow direction of the first battery heating circuit is as follows: the coolant flows out from the motor water pump 6, flows through the motor system, the low-temperature radiator 1, the overflow tank 5, the first end of the four-way valve 28, the second end of the four-way valve 28, and the first three-way valve 30, and then enters the coolant flow channel, flows out of the coolant flow channel, passes through the battery water pump 29, the third end of the four-way valve 28, and the fourth end of the four-way valve 28, and then returns to the motor water pump 6. When the first battery heating circuit is working, the low-temperature radiator 1 is not working.

[0080] In one possible implementation, Figure 1 As shown, the battery heating circuit includes a second battery heating circuit; the PTC heating system includes a PTC heater 19, a first water pump 18, a first three-way valve 30 and a second three-way valve 22;

[0081] In the second battery heating circuit, the second end of the first water pump 18 is connected to the first end of the PTC heater 19, the second end of the PTC heater 19 is connected to the first end of the first three-way valve 30, the second end of the first three-way valve 30 is connected to the first end of the coolant flow channel, the second end of the coolant flow channel is connected to the first end of the battery water pump 29, the second end of the battery water pump 29 is connected to the first end of the second three-way valve 22, the second end of the second three-way valve 22 is connected to the first end of the first water pump 18; the third end of the first three-way valve 30 is connected to the first end of the second three-way valve 22.

[0082] In this embodiment, the second battery heating circuit also includes a four-way valve. In the second battery heating circuit, the second end of the first water pump 18 is connected to the first end of the PTC heater 19, the second end of the PTC heater 19 is connected to the first end of the first three-way valve 30, the second end of the first three-way valve 30 is connected to the first end of the coolant flow channel, the second end of the coolant flow channel is connected to the first end of the battery water pump 29, the second end of the battery water pump 29 is connected to the third end of the four-way valve 28, the second end of the four-way valve 28 is connected to the first end of the second three-way valve 22, the second end of the second three-way valve 22 is connected to the first end of the first water pump 18; the third end of the first three-way valve 30 is connected to the first end of the second three-way valve 22.

[0083] In this embodiment, the PTC heating system further includes an overflow tank 21, which is connected in series between the second end of the second three-way valve 22 and the first end of the first water pump 18. The second battery heating circuit further includes a four-way valve 28; the PTC heater 19 is specifically a water-heating driven PTC heater.

[0084] In the second battery heating circuit, the second end of the first water pump 18 is connected to the first end of the PTC heater 19, the second end of the PTC heater 19 is connected to the first end of the first three-way valve 30, the second end of the first three-way valve 30 is connected to the first end of the coolant flow channel, the second end of the coolant flow channel is connected to the first end of the battery water pump 29, the second end of the battery water pump 29 is connected to the third end of the four-way valve 28, the second end of the four-way valve 28 is connected to the first end of the second three-way valve 22, the second end of the second three-way valve 22 is connected to the first end of the overflow tank 21, and the second end of the overflow tank 21 is connected to the first end of the first water pump 18; the third end of the first three-way valve 30 is connected to the first end of the second three-way valve 22.

[0085] Specifically, the coolant flow direction of the second battery heating circuit is as follows: the coolant flows out from the first water pump 18, is heated by the PTC heater 19, flows into the coolant flow channel after passing through the heater core 20 and the first three-way valve 30, and heats the battery module 12. The coolant flows out from the coolant flow channel and passes through the battery water pump 29, the four-way valve 28, the second three-way valve 22, and the overflow tank 21, and then returns to the first water pump 18. When the passenger compartment has a heating demand, the heater core 20 starts to work, transfers heat to the surrounding air through heat exchange, and provides warm air for the vehicle air conditioning system. At this time, the PTC heating system can heat the battery module 12 through the second battery heating circuit while heating the passenger compartment, so that no additional electric heating film is required to work, which can not only achieve the effect of energy saving, but also simplify the thermal management architecture of the vehicle; when the passenger compartment has no heating demand, the heater core 20 does not work, and the PTC heater 19 can heat the battery module 12 alone.

[0086] In a possible implementation, the battery heating circuit includes a third battery heating circuit; the engine waste heat recovery system includes an engine 24 and an engine water pump 25;

[0087] In the third battery heating circuit, the second end of the first water pump 18 is communicated with the first end of the PTC heater 19, the second end of the PTC heater 19 is communicated with the first end of the first three-way valve 30, the second end of the first three-way valve 30 is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump 29, the second end of the battery water pump 29 is communicated with the first end of the second three-way valve 22, the third end of the second three-way valve 22 is communicated with the first end of the engine water pump 25; the second end of the engine water pump 25 is communicated with the first end of the circulating fluid pipeline of the engine 24, and the second end of the circulating fluid pipeline of the engine 24 is communicated with the first end of the first water pump 18.

[0088] In this embodiment, the third battery heating circuit further includes a four-way valve. In the third battery heating circuit, the second end of the first water pump 18 is communicated with the first end of the PTC heater 19, the second end of the PTC heater 19 is communicated with the first end of the first three-way valve 30, the second end of the first three-way valve 30 is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump 29, the second end of the battery water pump 29 is communicated with the third end of the four-way valve 28, the second end of the four-way valve 28 is communicated with the first end of the second three-way valve 22, the third end of the second three-way valve 22 is communicated with the first end of the engine water pump 25; the second end of the engine water pump 25 is communicated with the first end of the circulating fluid pipeline of the engine 24, and the second end of the circulating fluid pipeline of the engine 24 is communicated with the first end of the first water pump 18.

[0089] In this embodiment, the engine waste heat recovery system further includes a thermostat 23 , an overflow tank 26 and a high temperature radiator 3 . The third battery heating circuit further includes a four-way valve 28 .

[0090] Specifically, in the third battery heating circuit, the second end of the first water pump 18 is communicated with the first end of the PTC heater 19, the second end of the PTC heater 19 is communicated with the first end of the first three-way valve 30, the second end of the first three-way valve 30 is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump 29, the second end of the battery water pump 29 is communicated with the third end of the four-way valve 28, the second end of the four-way valve 28 is communicated with the first end of the second three-way valve 22, the second end of the second three-way valve 22 is communicated with the first end of the overflow tank 21, and the second end of the overflow tank 21 is communicated with the third end of the four-way valve 28. The two ends are connected to the first end of the first water pump 18, and the third end of the second three-way valve 22 is connected to the first end of the engine water pump 25; the second end of the engine water pump 25 is connected to the first end of the circulating fluid pipeline of the engine 24, and the second end of the circulating fluid pipeline of the engine 24 is respectively connected to the second end of the overflow tank 21 and the first end of the thermostat 23, the second end of the thermostat 23 is connected to the first end of the high-temperature radiator 3, and the second end of the high-temperature radiator 3 is connected to the first end of the engine water pump 25, wherein the first end of the overflow tank 26 is also connected to the first end of the engine water pump 25, and the second end of the overflow tank 26 is connected to the first end of the high-temperature radiator 3.

[0091] In this embodiment, the coolant flow direction of the third battery heating circuit is as follows: after being heated by the engine 24, the coolant flows into the coolant flow channel after passing through the overflow tank 21, the first water pump 18, the PTC heater 19, the heater core 20, and the first three-way valve 30 to heat the battery module 12. After flowing out of the coolant flow channel, the coolant passes through the battery water pump 29, the four-way valve 28, the second three-way valve 22, and the engine water pump 25 and returns to the engine 24. When the third battery heating circuit is working, the PTC heater 19, the first water pump 18, the engine 24, and the engine water pump 25 can work at the same time, and the battery module 12 is heated by the heat generated by the PTC heater 19 and the residual heat of the engine; the PTC heater 19 and the first water pump 18 can also not work, and the battery module 12 is heated by the residual heat of the engine alone.

[0092] In a possible implementation, the refrigerant refrigeration circuit includes an evaporator 16, a compressor 17 and a condenser 2;

[0093] In the battery direct cooling circuit, the first end of the refrigerant flow channel is connected to the first end of the condenser 2 and the first end of the evaporator 16 respectively, the second end of the refrigerant flow channel and the second end of the evaporator 16 are both connected to the first end of the compressor 17, and the second end of the compressor 17 is connected to the second end of the condenser 2.

[0094] In this embodiment, the battery direct cooling circuit further includes a first solenoid valve 10 , a second solenoid valve 15 , a temperature and pressure sensor 14 , and a pressure sensor 27 .

[0095] Specifically, the first end of the refrigerant flow channel is communicated with the first end of the first solenoid valve 10, the second end of the first solenoid valve 10 is communicated with the second solenoid valve 15 and the first end of the condenser 2 respectively, the second end of the second solenoid valve 15 is communicated with the first end of the evaporator, the second end of the refrigerant flow channel and the second end of the evaporator are both communicated with the first end of the compressor 17, and the second end of the compressor 17 is communicated with the second end of the condenser 2. Among them, the temperature and pressure sensor 14 is installed between the refrigerant flow channel and the compressor 17. The pressure sensor 27 is arranged at the first end of the condenser 2.

[0096] In one possible embodiment, the temperature equalizing circuit also includes a first solenoid valve and a four-way valve 28. In the temperature equalizing circuit, the second end of the battery water pump 29 is connected to the third end of the four-way valve 28, the second end of the four-way valve 28 is connected to the third end of the first three-way valve 30, the second end of the first three-way valve 30 is connected to the first end of the coolant flow channel, and the second end of the coolant flow channel is connected to the first end of the battery water pump 29.

[0097] See also Figure 2 , which shows a flow chart of the implementation of the control method of the battery thermal management system provided by the embodiment of the present application, which is described in detail as follows:

[0098] S101: When the temperature of the battery module 12 of the vehicle is greater than a first preset temperature, the battery direct cooling circuit is controlled to operate; and when the battery direct cooling circuit is operating, if it is monitored that the temperature of the battery module 12 of the vehicle does not meet the preset temperature condition, the temperature equalization circuit is controlled to operate.

[0099] The execution subject of this embodiment is a controller, which can be an on-board controller or an off-board controller, or a combination of an on-board controller and an off-board controller, which can be determined according to the specific situation. Here, the execution subject is an on-board controller, such as a vehicle controller unit (VCU), that is, a powertrain controller, as an example for explanation.

[0100] Specifically, a first temperature sensor is provided on the battery module 12, and the temperature of the battery module 12 is collected by the first temperature sensor, and the temperature of the battery module 12 is sent to the vehicle controller. The vehicle controller determines whether the battery module 12 needs to be heated or cooled based on the temperature of the battery module 12. When the temperature of the battery module 12 is greater than the first preset temperature, it is considered that the temperature of the battery module 12 is too high and the battery module 12 needs to be cooled. At this time, a refrigerant direct cooling system can be used to cool the battery module 12. The temperature of the battery module 12 may include the average temperature of all the cells in the battery module 12, the highest cell temperature, and the lowest cell temperature.

[0101] In this embodiment, the battery module 12 includes multiple battery cells, and the temperatures of different battery cells may be different. The battery water pump 29 on the temperature equalization loop can speed up the flow rate of the coolant flow channel flowing through the battery module 12, thereby improving the temperature equalization efficiency between the battery cells. Therefore, in this embodiment, when the temperature of the battery module 12 does not meet the preset temperature conditions, the temperature equalization loop can be started. Specifically, when the temperature equalization loop is working, the battery water pump 29 is in a working state.

[0102] Specifically, the first preset temperature may be 35°C to 40°C, and the second preset temperature may be 10°C to 20°C.

[0103] S102: When the temperature of the battery module 12 is lower than a second preset temperature, control the battery heating circuit to operate; wherein the first preset temperature is higher than the second preset temperature.

[0104] In this embodiment, when the temperature of the battery module 12 is lower than the second preset temperature, it indicates that the temperature of the battery module 12 is relatively low and the battery needs to be heated. At this time, the on-board controller controls the battery heating circuit to heat the battery module 12 through the waste heat of the motor system, the waste heat of the engine 24 and / or the heat generated by the PTC heater 19.

[0105] It can be seen from the above embodiments that the control method of the thermal management system provided in this embodiment selects the battery direct cooling circuit to work when the battery has a cooling demand, which can achieve a rapid cooling effect. At the same time, a temperature equalization circuit is used to solve the problem of large temperature difference of the battery cells in the battery direct cooling circuit. When the battery has a heating demand, the coolant flow channel of the dual-medium cold plate 11 is connected to the vehicle's engine 24, motor system, and PTC heating system. The battery module 12 can be heated by the waste heat of the vehicle's engine 24 and motor when they are working, and the battery heating film is omitted, thereby achieving the effect of reducing the cost and weight of the entire vehicle.

[0106] In a possible implementation, the temperature of the battery module 12 includes a maximum battery cell temperature; the specific implementation process of S101 includes:

[0107] When the highest battery cell temperature is greater than the first preset temperature, if the motor temperature is greater than the target temperature, the battery direct cooling circuit is controlled to operate; the motor temperature is the temperature of the coolant flowing through the motor system.

[0108] In a possible implementation, when the temperature of the battery module 12 of the vehicle is greater than the first preset temperature, the method provided in this embodiment further includes:

[0109] When the highest battery cell temperature is greater than a first preset temperature, if the motor temperature is less than or equal to a target temperature, the battery liquid cooling circuit is controlled to operate.

[0110] When the highest cell temperature is greater than the first preset temperature, that is, the battery module 12 has a cooling requirement, it is determined whether the motor temperature is not greater than the target temperature. If the motor temperature is not greater than the target temperature, it means that the temperature of the motor system coolant is low at this time, and the motor liquid cooling system can be used to cool the battery module 12. Therefore, the on-board controller uses a battery liquid cooling circuit to replace the battery direct cooling circuit to avoid the problem of high energy consumption caused by the continuous operation of the battery direct cooling circuit, thereby achieving the effect of saving energy consumption.

[0111] The target temperature can be a fixed value or a variable value. When the target temperature is a variable value, the target temperature is negatively correlated with the maximum cell temperature. Since the maximum cell temperature is different, the cooling amount required for cooling the battery module is different. Therefore, the target temperature is not fixed, but changes with the maximum cell temperature. The target temperature is negatively correlated with the maximum cell temperature, that is, the higher the maximum cell temperature, the lower the target temperature, and the lower the maximum cell temperature, the higher the target temperature.

[0112] Specifically, the target temperature is the difference between the set temperature and a first value; the first value is the difference between the maximum battery cell temperature and the first preset temperature.

[0113] Specifically, the difference between the highest battery cell temperature and the first preset temperature is the temperature value that the battery liquid cooling circuit needs to lower. The set temperature is a value in a conventional temperature range. The set temperature is subtracted from the temperature value that the battery liquid cooling circuit needs to lower. The target temperature obtained is the maximum temperature value that meets the cooling requirements of the current battery module. When the motor temperature is lower than the target temperature, it means that the temperature of the coolant in the battery liquid cooling circuit can meet the cooling requirements of the battery module.

[0114] Exemplarily, the set temperature may be a value in a normal temperature range, the normal temperature range is 20° C. to 30° C., and the set temperature may be 30° C. The first preset temperature may be 35° C. to 40° C.

[0115] When the battery module 12 has a cooling demand, but the motor temperature is greater than the target temperature, it means that the battery liquid cooling system itself has a large cooling demand. The high temperature of the motor will affect the coolant circuit of the battery module 12 to meet the cooling demand of the battery module. Therefore, a battery direct cooling circuit is used to cool the battery module 12.

[0116] This embodiment determines whether the motor liquid cooling system can meet the battery cooling demand by monitoring the relationship between the motor temperature and the maximum battery cell temperature, and adopts the battery liquid cooling circuit when the battery cooling demand is met, and adopts the battery direct cooling circuit when the battery cooling demand is not met, thereby achieving the effect of reducing energy consumption.

[0117] In a possible implementation, an implementation process of S102 includes:

[0118] If the battery module 12 is in a discharging state and the temperature of the battery module 12 is lower than a second preset temperature, the first battery heating circuit and / or the third battery heating circuit are controlled to operate.

[0119] If the battery module 12 is in a charging state and the temperature of the battery module 12 is lower than a second preset temperature, the second heating circuit is controlled to operate.

[0120] Specifically, since the battery module 12 is in a charging state, the vehicle is in an unstarted state, and the motor system and the engine 24 do not generate heat, the PTC heating system needs to be used to heat the battery module 12 at this time. When the battery module 12 is in a discharging state and the vehicle is in a starting state, the first battery heating circuit is controlled to work first. When the difference between the motor temperature and the battery temperature is less than the first target difference, it means that the motor temperature is too low to meet the battery heating demand, and the third battery heating circuit is controlled to work. When the difference between the engine temperature and the battery temperature is less than the second target difference, it means that the waste heat temperature generated by the engine is too low to meet the battery heating demand, and the second battery heating circuit is controlled to work. Among them, the engine temperature is the temperature of the coolant flowing through the engine 24.

[0121] In this embodiment, when the battery module 12 is in a discharging state and the temperature of the battery module 12 is lower than a second preset temperature, the first battery heating circuit, the second battery heating circuit and the third battery heating circuit may all be controlled to operate.

[0122] This embodiment provides a first battery heating circuit, a second battery heating circuit and a third battery heating circuit, thereby being able to meet the battery heating requirements when the battery module is in different states, and using engine waste heat, motor waste heat and PTC waste heat to heat the battery, thereby achieving the effect of saving energy.

[0123] In a possible implementation, the temperature of the battery module 12 includes a minimum cell temperature; the second preset temperature includes a first temperature value and a second temperature value; and the first temperature value is less than the second temperature value; another specific implementation process of S102 includes:

[0124] If the battery module 12 is in a discharging state, the lowest battery cell temperature is lower than the first temperature value, the motor temperature is lower than a third preset temperature, and the difference between the motor temperature and the lowest battery cell temperature is not lower than the first temperature difference, the first battery heating circuit is controlled to operate;

[0125] If the battery module 12 is in a charging state and the lowest battery cell temperature is less than the second temperature value, the second battery heating circuit is controlled to operate;

[0126] If the battery module 12 is in a discharging state, the minimum battery cell temperature is less than the first temperature value, and the engine temperature is within a preset engine temperature range, the third battery heating circuit is controlled to operate; the engine temperature is the temperature of the coolant flowing through the engine 24 .

[0127] In this embodiment, when the battery module 12 is in a discharging state, if the lowest battery cell temperature is less than the first temperature value, it means that the battery module 12 has a heating demand at this time. At this time, if the difference between the motor temperature and the lowest battery cell temperature is greater than the first temperature difference, it means that the temperature of the coolant flowing through the motor system is relatively high, and the battery module 12 can be heated. At this time, it is also necessary to determine whether the motor temperature is less than the third preset temperature. If the motor temperature is less than the third preset temperature, it means that the temperature of the coolant flowing through the motor system will not be too high to damage the battery module 12. Therefore, the first battery heating circuit can be controlled to work, and the waste heat of the motor system can be used to heat the battery module 12.

[0128] When the battery module 12 is in a discharging state, if the lowest battery cell temperature is not less than the first temperature value, the battery heating circuit does not need to be started. If the lowest battery cell temperature is less than the first temperature value, the motor temperature is greater than the third preset temperature or the difference between the motor temperature and the lowest battery cell temperature is greater than the first temperature difference, the first battery heating circuit is not started.

[0129] When the battery module 12 is in a discharging state and the battery module 12 needs to be heated, it is also possible to determine whether to start the third battery heating circuit based on the engine temperature. When the engine temperature is within a preset range, that is, when the engine temperature is not greater than the upper limit of the engine temperature, and the difference between the engine temperature and the lowest battery cell temperature is greater than the fourth temperature difference, it means that the temperature of the coolant flowing through the engine is relatively high at this time, which can heat the battery module 12, but will not be too high to damage the battery module. In this case, the third battery heating circuit is controlled to operate.

[0130] When the battery is in a discharging state and the battery module 12 has a heating requirement, if the motor temperature is not less than the third preset temperature, or the difference between the motor temperature and the minimum battery cell temperature is not greater than the first temperature difference, or the engine temperature is not within the preset engine temperature range, the second battery heating circuit is controlled to operate.

[0131] Specifically, the first temperature value is smaller than the second temperature value. The first temperature value may be 10° C., and the second temperature value may be 20° C.

[0132] In a possible implementation, the temperature of the battery module 12 includes a maximum cell temperature and a minimum cell temperature; in S101, when the battery direct cooling circuit is working, if it is monitored that the temperature of the battery module 12 of the vehicle does not meet the preset temperature condition, the specific implementation process of controlling the temperature equalization circuit to work includes:

[0133] When the battery direct cooling circuit is working, if it is monitored that the difference between the highest battery cell temperature and the lowest battery cell temperature is greater than the second temperature difference, the temperature equalizing circuit is controlled to work; if it is monitored that the battery module 12 has a thermal runaway fault, the temperature equalizing circuit is controlled to work, and the battery direct cooling circuit is controlled to stop working.

[0134] In this embodiment, when a thermal runaway fault occurs in the battery, the high-voltage compressor 17 is not allowed to operate, so the battery direct cooling circuit needs to be prohibited from operating. At this time, the rapid circulation of the coolant in the temperature equalization circuit can be used alone to dissipate heat from the battery module 12.

[0135] Since the battery direct cooling circuit uses refrigerant to dissipate heat from the battery module 12, it will cause a large temperature difference in the battery cells when the refrigerant flow rate is not large. Therefore, this embodiment can control the battery direct cooling circuit and the temperature equalization circuit to work simultaneously when the difference between the highest battery cell temperature and the lowest battery cell temperature is greater than the first preset difference. Through the heat exchange of the refrigerant flow channel and the coolant flow channel in the dual-medium cold plate 11, and the rapid circulation of the coolant, the battery module 12 can be evenly heated and quickly cooled, thereby achieving a rapid and balanced cooling effect on the battery module 12.

[0136] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0137] The following is an embodiment of the device of the present application. For details not described in detail, please refer to the corresponding method embodiment described above.

[0138] The present application provides a control device for a thermal management system of a vehicle, which includes:

[0139] A battery direct cooling module, used to control the battery direct cooling circuit to operate when the temperature of the battery module 12 of the vehicle is greater than a first preset temperature; and when the battery direct cooling circuit is operating, if it is monitored that the temperature of the battery module 12 of the vehicle does not meet the preset temperature condition, then control the temperature equalization circuit to operate;

[0140] A battery heating module, used to control the battery heating circuit to operate when the temperature of the battery module 12 is lower than a second preset temperature;

[0141] Wherein, the first preset temperature is greater than the second preset temperature.

[0142] In a possible implementation, the temperature of the battery module 12 includes a maximum battery cell temperature; the battery direct cooling module is specifically used for:

[0143] When the highest battery cell temperature is greater than the first preset temperature, if the motor temperature is greater than the target temperature, the battery direct cooling circuit is controlled to operate; the motor temperature is the temperature of the coolant flowing through the motor system.

[0144] In one possible implementation, the control device of the thermal management system of the vehicle further includes a battery liquid cooling module for:

[0145] When the highest battery cell temperature is greater than a first preset temperature, if the motor temperature is less than or equal to a target temperature, the battery liquid cooling circuit is controlled to operate.

[0146] In a possible implementation, the temperature of the battery module 12 includes a minimum battery cell temperature; the second preset temperature includes a first temperature value and a second temperature value; and the first temperature value is less than the second temperature value; the battery heating module is specifically used for:

[0147] If the battery module 12 is in a discharging state, the lowest battery cell temperature is lower than the first temperature value, the motor temperature is lower than a third preset temperature, and the difference between the motor temperature and the lowest battery cell temperature is not lower than the first temperature difference, the first battery heating circuit is controlled to operate;

[0148] If the battery module 12 is in a charging state and the lowest battery cell temperature is less than the second temperature value, the second battery heating circuit is controlled to operate;

[0149] If the battery module 12 is in a discharging state, the lowest battery cell temperature is less than the first temperature value, and the engine temperature is within a preset engine temperature range, the third battery heating circuit is controlled to operate.

[0150] In a possible implementation, the temperature of the battery module 12 includes a maximum battery cell temperature and a minimum battery cell temperature; the battery direct cooling module further includes:

[0151] The temperature averaging unit is used to control the temperature averaging circuit to operate when the battery direct cooling circuit is operating. If the difference between the highest battery cell temperature and the lowest battery cell temperature is detected to be greater than a second temperature difference, the temperature averaging circuit is controlled to operate; if a thermal runaway fault is detected in the battery module 12, the temperature averaging circuit is controlled to operate and the battery direct cooling circuit is controlled to stop operating.

[0152] It can be seen from the above embodiments that the control device of the thermal management system provided in this embodiment determines whether to use the motor liquid cooling circuit based on the motor temperature when the motor has a cooling demand, which can achieve the effect of saving energy consumption. At the same time, when the battery temperature does not meet the preset temperature condition, the battery is equalized by a temperature equalization circuit, which can avoid the problem of large temperature difference in the battery cells. When the motor has a heating demand, the battery module 12 is heated by the waste heat of the vehicle's engine and motor when they are working, and the battery heating film is omitted, thereby achieving the effect of reducing the cost and weight of the entire vehicle.

[0153] The present application also provides a computer program product having a program code, which executes the steps of any of the above-mentioned control methods of the thermal management system of the battery when the program code is executed in a corresponding processor, controller, computing device or terminal, such as Figure 2Steps S101 to S102 shown. It will be appreciated by those skilled in the art that the method and the device proposed in the embodiment of the present application can be implemented in various forms of hardware, software, firmware, a dedicated processor or a combination thereof. The dedicated processor may include an application specific integrated circuit (ASIC), a reduced instruction set computer (RISC) and / or a field programmable gate array (FPGA). The proposed method and device are preferably implemented as a combination of hardware and software. The software is preferably installed on a program storage device as an application. It is typically based on a machine with a computer platform having hardware, such as one or more central processing units (CPUs), random access memories (RAMs) and one or more input / output (I / O) interfaces. An operating system is also typically installed on the computer platform. The various processes and functions described herein may be part of an application, or a part thereof may be executed by an operating system.

[0154] Figure 3 is a schematic diagram of a controller provided in an embodiment of the present application. Figure 3 As shown, the controller 3 of this embodiment includes: a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30. When the processor 30 executes the computer program 32, the steps in the control method of the thermal management system of each battery described above are implemented, such as Figure 2 Alternatively, when the processor 30 executes the computer program 32, the functions of the modules / units in the above-mentioned device embodiments are realized.

[0155] Exemplarily, the computer program 32 may be divided into one or more modules / units, which are stored in the memory 31 and executed by the processor 30 to complete / implement the solution provided by the present application. The one or more modules / units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 32 in the controller 3.

[0156] The controller 3 may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will appreciate that Figure 3 It is only an example of the controller 3 and does not constitute a limitation of the controller 3. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the controller may also include input and output devices, network access devices, buses, etc.

[0157] The processor 30 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0158] The memory 31 may be an internal storage unit of the controller 3, such as a hard disk or memory of the controller 3. The memory 31 may also be an external storage device of the controller 3, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the controller 3. Further, the memory 31 may also include both an internal storage unit of the controller 3 and an external storage device. The memory 31 is used to store the computer program and other programs and data required by the controller. The memory 31 may also be used to temporarily store data that has been output or is to be output.

[0159] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0160] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0161] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0162] In the embodiments provided in the present application, it should be understood that the disclosed devices / controllers and methods can be implemented in other ways. For example, the device / controller embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0163] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0164] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0165] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the control method embodiment of the thermal management system of each battery can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0166] In one embodiment, the present application provides a vehicle, which includes the thermal management system and controller of the battery as described above.

[0167] In addition, the embodiments shown in the drawings of the present application or the features of the various embodiments mentioned in this specification are not necessarily understood as independent embodiments. Instead, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.

[0168] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A thermal management system for a battery, characterized in that: include: Battery direct cooling circuit, temperature equalization circuit and battery heating circuit; The battery direct cooling circuit includes a dual-medium cold plate and a refrigerant refrigeration system; the dual-medium cold plate is arranged at the battery module, including a refrigerant flow channel and a coolant flow channel; the temperature equalization circuit includes the dual-medium cold plate and a battery water pump; the battery heating circuit includes the battery water pump, the dual-medium cold plate, a PTC heating system, an engine waste heat recovery system and a motor liquid cooling system; The refrigerant flow channel is connected to the refrigerant refrigeration system to form the battery direct cooling circuit; The coolant flow channel is connected to the battery water pump to form the temperature equalization circuit; After the coolant flow channel is connected to the battery water pump, it is connected to at least one of the PTC heating system, the engine waste heat recovery system and the motor liquid cooling system to form the battery heating circuit.

2. The thermal management system of a battery according to claim 1, characterized in that: The motor liquid cooling system includes a motor system, a motor water pump and a radiator; the thermal management system also includes a battery liquid cooling circuit; the battery liquid cooling circuit includes the battery water pump, the dual-medium cold plate and a four-way valve; In the battery liquid cooling circuit, the first end of the motor water pump is communicated with the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator, the second end of the radiator is communicated with the first end of the four-way valve, the second end of the four-way valve is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump, the second end of the battery water pump is communicated with the third end of the four-way valve, and the fourth end of the four-way valve is communicated with the second end of the motor water pump; When the battery liquid cooling circuit is working, the coolant flows into the coolant flow channel after dissipating heat through the radiator to dissipate heat for the battery module.

3. The thermal management system of a battery according to claim 1, characterized in that: The battery heating circuit includes a first battery heating circuit; the motor liquid cooling system includes a motor system, a motor water pump and a radiator; the first battery heating circuit also includes a four-way valve; In the first battery heating circuit, the first end of the motor water pump is communicated with the first end of the circulating liquid pipeline of the motor system, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator, the second end of the radiator is communicated with the first end of the four-way valve, the second end of the four-way valve is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump, the second end of the battery water pump is communicated with the third end of the four-way valve, and the fourth end of the four-way valve is communicated with the second end of the motor water pump; When the first battery heating circuit is working, the radiator is not working, and the coolant flows into the coolant channel after being heated by the motor system to heat the battery module.

4. The thermal management system of a battery according to claim 3, characterized in that: The battery heating circuit includes a second battery heating circuit; the PTC heating system includes a PTC heater, a first water pump, a first three-way valve and a second three-way valve; In the second battery heating circuit, the second end of the first water pump is connected to the first end of the PTC heater, the second end of the PTC heater is connected to the first end of the first three-way valve, the second end of the first three-way valve is connected to the first end of the coolant flow channel, the second end of the coolant flow channel is connected to the first end of the battery water pump, the second end of the battery water pump is connected to the first end of the second three-way valve, the second end of the second three-way valve is connected to the first end of the first water pump; the third end of the first three-way valve is connected to the first end of the second three-way valve.

5. The thermal management system of a battery according to claim 4, characterized in that: The battery heating circuit includes a third battery heating circuit; the engine waste heat recovery system includes an engine and an engine water pump; In the third battery heating circuit, the second end of the first water pump is communicated with the first end of the PTC heater, the second end of the PTC heater is communicated with the first end of the first three-way valve, the second end of the first three-way valve is communicated with the first end of the coolant flow channel, the second end of the coolant flow channel is communicated with the first end of the battery water pump, the second end of the battery water pump is communicated with the first end of the second three-way valve, and the third end of the second three-way valve is communicated with the first end of the engine water pump; the second end of the engine water pump is communicated with the first end of the circulating fluid pipeline of the engine, and the second end of the circulating fluid pipeline of the engine is communicated with the first end of the first water pump.

6. The thermal management system of a battery according to any one of claims 1 to 5, characterized in that: The refrigerant refrigeration circuit includes an evaporator, a compressor and a condenser; In the battery direct cooling circuit, the first end of the refrigerant flow channel is connected to the first end of the condenser and the first end of the evaporator respectively, the second end of the refrigerant flow channel and the second end of the evaporator are both connected to the first end of the compressor, and the second end of the compressor is connected to the second end of the condenser.

7. A control method for a battery thermal management system, characterized in that: A thermal management system for a battery as claimed in any one of claims 1 to 6, the method comprising: When the temperature of the battery module of the vehicle is greater than a first preset temperature, the battery direct cooling circuit is controlled to operate; and when the battery direct cooling circuit is operating, if it is monitored that the temperature of the battery module of the vehicle does not meet the preset temperature condition, the temperature equalization circuit is controlled to operate; When the temperature of the battery module is lower than a second preset temperature, controlling the battery heating circuit to operate; Wherein, the first preset temperature is greater than the second preset temperature.

8. The control method of the battery thermal management system according to claim 7, characterized in that: The temperature of the battery module includes the maximum cell temperature; When the temperature of the battery module of the vehicle is greater than the first preset temperature, controlling the battery direct cooling circuit to operate includes: When the highest battery cell temperature is greater than the first preset temperature, if the motor temperature is greater than the target temperature, the battery direct cooling circuit is controlled to operate; the motor temperature is the temperature of the coolant flowing through the motor system.

9. The control method of the battery thermal management system according to claim 8, characterized in that: When the temperature of the battery module of the vehicle is greater than a first preset temperature, the method further includes: When the highest battery cell temperature is greater than a first preset temperature, if the motor temperature is less than or equal to a target temperature, the battery liquid cooling circuit is controlled to operate.

10. The control method of the battery thermal management system according to claim 7, characterized in that: The temperature of the battery module includes a minimum battery cell temperature; the second preset temperature includes a first temperature value and a second temperature value; and the first temperature value is less than the second temperature value; When the temperature of the battery module is lower than a second preset temperature, controlling the battery heating circuit to operate includes: If the battery module is in a discharging state, the lowest battery cell temperature is lower than the first temperature value, the motor temperature is lower than a third preset temperature, and the difference between the motor temperature and the lowest battery cell temperature is not lower than the first temperature difference, the first battery heating circuit is controlled to operate; the motor temperature is the temperature of the coolant flowing through the motor system; If the battery module is in a charging state and the lowest battery cell temperature is lower than the second temperature value, controlling the second battery heating circuit to operate; If the battery module is in a discharging state, the minimum battery cell temperature is less than the first temperature value, and the engine temperature is within a preset engine temperature range, the third battery heating circuit is controlled to operate; the engine temperature is the temperature of the coolant flowing through the engine.

11. The control method of the battery thermal management system according to claim 7, characterized in that: The temperature of the battery module includes a maximum battery cell temperature and a minimum battery cell temperature; when the battery direct cooling circuit is working, if it is monitored that the temperature of the battery module of the vehicle does not meet the preset temperature condition, the temperature equalization circuit is controlled to work, including: When the battery direct cooling circuit is working, if it is monitored that the difference between the highest battery cell temperature and the lowest battery cell temperature is greater than the second temperature difference, the temperature equalizing circuit is controlled to work; if it is monitored that the battery module has a thermal runaway fault, the temperature equalizing circuit is controlled to work, and the battery direct cooling circuit is controlled to stop working.

12. A vehicle, characterized in that: A thermal management system for a vehicle comprising the method according to any one of claims 1 to 6.

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