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 and a battery heating loop. Wherein the battery direct cooling loop is formed by communicating the refrigerant flow channel with the refrigerant refrigerating system; and the battery heating loop is formed by communicating the cooling liquid flow channel with at least one of the PTC heating system, the engine waste heat recovery system and the motor liquid cooling system. According to the thermal 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, a PTC and a motor of the vehicle work, a battery heating film is simplified, and the effect of reducing cost and weight of the whole vehicle is achieved.

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 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 problem of high energy consumption of the battery thermal management system.

[0005] In a first aspect, the present application provides a battery thermal management system, which includes: a battery direct cooling 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 battery heating circuit includes 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 selectively 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.

[0009] The thermal management system provided in this embodiment can cool the battery through the vehicle's refrigerant refrigeration system and heat the battery module through the waste heat from the vehicle's engine, PTC, and motor when a dual-medium cold plate is set in the battery module. This simplifies the battery heating film and achieves the effect of reducing the cost and weight of the entire vehicle.

[0010] In a possible implementation, the battery thermal management system further includes a battery liquid cooling circuit;

[0011] The battery liquid cooling circuit includes the dual-medium cold plate and the motor liquid cooling system;

[0012] The coolant flow channel and the motor liquid cooling system are connected to form the battery liquid cooling circuit.

[0013] In this embodiment, the coolant flow channel in the dual-medium cold plate is connected to the battery liquid cooling system, 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 uniformity.

[0014] In a possible implementation, the motor liquid cooling system includes a motor system, a motor water pump and a radiator; the battery liquid cooling circuit also includes a four-way valve;

[0015] In the battery liquid cooling circuit, the first end of the motor water pump is communicated with the first end of the four-way valve, the fourth end of the four-way valve 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 second end of the motor water pump, the second end of the four-way valve is communicated with the first end of the coolant flow channel, and the second end of the coolant flow channel is communicated with the third end of the four-way valve;

[0016] 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.

[0017] 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.

[0018] 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;

[0019] In the first battery heating circuit, the first end of the motor water pump is communicated with the first end of the four-way valve, the fourth end of the four-way valve 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 second end of the motor water pump, the second end of the four-way valve is communicated with the first end of the coolant flow channel, and the second end of the coolant flow channel is communicated with the third end of the four-way valve;

[0020] 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.

[0021] 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.

[0022] 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;

[0023] 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 second end of the coolant flow channel, the first end of the coolant flow channel 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.

[0024] 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.

[0025] 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;

[0026] 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 second end of the coolant flow channel, the first end of the coolant flow channel 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.

[0027] 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.

[0028] In a possible implementation, the refrigerant refrigeration circuit includes an evaporator, a compressor and a condenser;

[0029] 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.

[0030] This embodiment can achieve rapid cooling of the battery module through the battery direct cooling circuit.

[0031] In a second aspect, an embodiment of the present application provides a control method for a battery thermal management system, which is applied to the battery thermal management system described in the first aspect above, and the method includes:

[0032] 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;

[0033] When the temperature of the battery module is lower than a second preset temperature, controlling the battery heating circuit to operate;

[0034] Wherein, the first preset temperature is greater than the second preset temperature.

[0035] The control method of the thermal management system provided in this embodiment cools the battery through a battery direct cooling circuit when the motor needs to be cooled, thereby improving the battery cooling efficiency. At the same time, when the battery needs to be heated, the coolant flow channel of the dual-medium cold plate is connected to the vehicle's engine, motor system and / or PTC heating system, so that the battery module can be heated by the residual heat of the vehicle's engine, PTC, and motor during operation, thereby omitting the battery heating film, thereby achieving the effect of reducing the cost and weight of the entire vehicle.

[0036] 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:

[0037] 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.

[0038] 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.

[0039] In a possible implementation, when the maximum battery core temperature is greater than a first preset temperature, the method further includes:

[0040] 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.

[0041] 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.

[0042] 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;

[0043] When the temperature of the battery module is lower than a second preset temperature, controlling the battery heating circuit to operate includes:

[0044] 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 value, the first battery heating circuit is controlled to operate;

[0045] 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;

[0046] 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.

[0047] 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.

[0048] In a possible implementation, the temperature of the battery module includes a maximum battery cell temperature and a minimum battery cell temperature; and the method further includes:

[0049] When the battery direct cooling circuit is working and the difference between the highest battery cell temperature and the lowest battery cell temperature is detected to be greater than a first preset difference, if the working requirement of the vehicle's PTC heating system is not detected, the second battery heating circuit is controlled to work, and the PTC heater in the second battery heating circuit is controlled to be prohibited from working;

[0050] When the battery direct cooling circuit is working and it is detected that the difference between the highest battery core temperature and the lowest battery core temperature is greater than a first preset difference, if it is detected that the PTC heating system of the vehicle has a working demand and the difference between the lowest battery temperature and the motor temperature is greater than a third temperature difference, the battery liquid cooling circuit is controlled to work;

[0051] When the battery direct cooling circuit is working, if it is monitored that the battery module has a thermal runaway fault, the battery liquid cooling circuit is controlled to work, and the battery direct cooling circuit is controlled to stop working.

[0052] In this embodiment, when the temperature difference of the battery cells is large, the battery liquid cooling circuit or the second battery heating circuit is used to equalize the temperature of the battery, which can 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, which can ensure the safe and stable operation of the battery thermal management system.

[0053] 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

[0054] 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.

[0055] 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;

[0056] 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;

[0057] Figure 3 is a schematic structural diagram of a control device for a thermal management system of a battery provided in an embodiment of the present application;

[0058] Figure 4 is a schematic diagram of a controller provided in an embodiment of the present application;

[0059] superior Figure 1 The meanings of the reference numerals in the figure are as follows:

[0060] 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. ​​First three-way valve. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] 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 and a battery heating circuit;

[0064] The battery direct cooling circuit includes a dual-medium cold plate 11 and a refrigerant refrigeration system; the dual-medium cold plate 11 is arranged at the battery module, including a refrigerant flow channel and a coolant flow channel; the battery heating circuit includes the dual-medium cold plate 11, a PTC (Positive Temperature Coefficient) heating system, an engine waste heat recovery system and a motor liquid cooling system;

[0065] The refrigerant flow channel is connected to the refrigerant refrigeration system to form the battery direct cooling circuit;

[0066] The coolant flow channel is selectively 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.

[0067] In this embodiment, the dual-medium cold plate 11 can be arranged on the upper side or the lower side of the battery module, 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.

[0068] 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.

[0069] In this embodiment, the dual-medium cold plate 11 can use refrigerant to dissipate heat from the battery module, and when the battery module is in a low-temperature environment, it can be connected to the motor system, the engine waste heat recovery system, and the PTC heating system through the coolant flow channel of the dual-medium cold plate 11, and the motor heat, engine waste heat and PTC heat are used to heat the battery, which simplifies the electric heating film structure, achieves the purpose of reducing the cost and weight of the whole vehicle, and saves the energy consumption of the thermal management system.

[0070] In a possible implementation, the battery thermal management system further includes a battery liquid cooling circuit;

[0071] The battery liquid cooling circuit includes the dual-medium cold plate 11 and the motor liquid cooling system;

[0072] The coolant flow channel and the motor liquid cooling system are connected to form the battery liquid cooling circuit.

[0073] In this embodiment, the dual-medium cold plate 11 can use both refrigerant and coolant to dissipate heat from the battery module. Furthermore, when the temperature of the battery module 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. When the temperature of the battery module 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.

[0074] In a possible implementation, the motor liquid cooling system includes a motor system, a motor water pump 6 and a radiator; the battery liquid cooling circuit also includes a four-way valve 28;

[0075] In the battery liquid cooling circuit, the first end of the motor water pump 6 is communicated with the first end of the four-way valve 28, the fourth end of the four-way valve 28 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 second end of the motor water pump 6, the second end of the four-way valve 28 is communicated with the first end of the coolant flow channel, and the second end of the coolant flow channel is communicated with the third end of the four-way valve 28;

[0076] 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.

[0077] 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 1; the motor liquid cooling system also includes an overflow tank 5 and a temperature sensor 8, and the OBC, PDU, DCDC rectifier circuit 7, the motor 9, the low-temperature radiator 1, the overflow tank 5 and the motor water pump 6 are connected in series to form a loop.

[0078] Specifically, the battery liquid cooling circuit also includes a first three-way valve 29. In the battery liquid cooling circuit, the first 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 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 second end of the motor water pump 6, 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 second end of the first three-way valve 29, and the third end of the first three-way valve 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 and the motor in the motor system.

[0079] 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, passes through the first end of the four-way valve 28, and then enters the coolant flow channel. After flowing out of the coolant flow channel, it passes through the first three-way valve 29, the third end of the four-way valve 28, and the fourth end of the four-way valve 28 to enter the circulating liquid pipeline of the motor system, and then returns to the motor water pump 6 through the overflow tank 5 after dissipating the heat through the low-temperature radiator 1.

[0080] 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 1; the first battery heating circuit also includes a four-way valve 28;

[0081] In the first battery heating circuit, the first end of the motor water pump 6 is communicated with the first end of the four-way valve 28, the fourth end of the four-way valve 28 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 second end of the motor water pump 6, the second end of the four-way valve 28 is communicated with the first end of the coolant flow channel, and the second end of the coolant flow channel is communicated with the third end of the four-way valve 28;

[0082] 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.

[0083] In this embodiment, the first battery heating circuit further includes a first three-way valve 29. In the first battery heating circuit, the first 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 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 second end of the motor water pump 6, 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 second end of the first three-way valve 29, and the third end of the first three-way valve 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 and the motor in the motor system.

[0084] 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, passes 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. After flowing out of the coolant flow channel, it passes through the first three-way valve 29, the third end of the four-way valve 28, and the fourth end of the four-way valve 28, and then enters the circulating liquid pipeline of the motor system. After the coolant is heated by the motor system, it returns to the motor water pump 6 through the low-temperature radiator 1 and the overflow tank 5. When the first battery heating circuit is working, the low-temperature radiator 1 does not work.

[0085] In a possible implementation, 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 29 and a second three-way valve 22;

[0086] 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 29, the second end of the first three-way valve 29 is connected to the second end of the coolant flow channel, the first end of the coolant flow channel 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 29 is connected to the first end of the second three-way valve 22.

[0087] In this embodiment, the PTC heating system 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 29, the second end of the first three-way valve 29 is connected to the second end of the coolant flow channel, the first end of the coolant flow channel is connected to the second end of the four-way valve 28, the third 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 29 is connected to the first end of the second three-way valve 22.

[0088] 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.

[0089] 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 29, the second end of the first three-way valve 29 is connected to the second end of the coolant flow channel, the first end of the coolant flow channel is connected to the second end of the four-way valve 28, the third 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, 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 29 is connected to the first end of the second three-way valve 22.

[0090] 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 29, and heats the battery module. The coolant flows out from the coolant flow channel and passes through 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. Among them, when there is a heating demand in the passenger compartment, the heater core 20 is turned on and works, and heat is transferred to the surrounding air through heat exchange to provide warm air for the vehicle air conditioning system. At this time, the PTC heating system can heat the battery module 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 there is no heating demand in the passenger compartment, the heater core 20 does not work, and the PTC heater 19 can heat the battery module alone.

[0091] 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 25;

[0092] 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 29, the second end of the first three-way valve 29 is communicated with the second end of the coolant flow channel, the first end of the coolant flow channel 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.

[0093] In the present embodiment, the third battery heating circuit also includes a four-way valve. In the third 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 29, the second end of the first three-way valve 29 is connected to the second end of the coolant flow channel, the first end of the coolant flow channel is connected to the second end of the four-way valve 28, the third end of the four-way valve 28 is connected to the first end of the second three-way valve 22, 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 connected to the first end of the first water pump 18.

[0094] In this embodiment, the engine waste heat recovery system further includes a thermostat, an overflow tank 26 and a high temperature radiator. The third battery heating circuit further includes a four-way valve 28 .

[0095] 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 29, the second end of the first three-way valve 29 is communicated with the second end of the coolant flow channel, the first end of the coolant flow channel is communicated with the second end of the four-way valve 28, the third 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 first water pump 18. The first end is connected, 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, the second end of the circulating fluid pipeline of the engine 24 is connected to the second end of the overflow tank 21 and the first end of the thermostat respectively, the second end of the thermostat is connected to the first end of the high-temperature radiator, the second end of the high-temperature radiator 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.

[0096] 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 29 to heat the battery module. After flowing out of the coolant flow channel, the coolant passes through the four-way valve 28, the second three-way valve 22, and the engine water pump 25 and returns to the engine 24. Among them, 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 is heated by the heat generated by the PTC heater 19 and the waste heat of the engine; the PTC heater 19 and the first water pump 18 can also not work, and the battery module is heated by the waste heat of the engine alone.

[0097] In a possible implementation, the refrigerant refrigeration circuit includes an evaporator 16, a compressor 2, and a condenser 2;

[0098] 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 connected to the first end of the compressor 2, and the second end of the compressor 2 is connected to the second end of the condenser 2.

[0099] 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 .

[0100] 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 2, and the second end of the compressor 2 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 2. The pressure sensor 27 is arranged at the first end of the condenser 2.

[0101] 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:

[0102] S101: When the temperature of the battery module of the vehicle is greater than a first preset temperature, control the battery direct cooling circuit to operate.

[0103] 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.

[0104] Specifically, a first temperature sensor is set on the battery module, and the temperature of the battery module is collected by the first temperature sensor, and the temperature of the battery module is sent to the vehicle controller. The vehicle controller determines whether the battery module needs to be heated or cooled based on the temperature of the battery module. When the temperature of the battery module is greater than the first preset temperature, it is considered that the temperature of the battery module is too high and the battery module needs to be cooled. At this time, a refrigerant direct cooling system can be used to cool the battery module. The temperature of the battery module may include the average temperature of all the cells in the battery module, the highest cell temperature, and the lowest cell temperature.

[0105] Specifically, the first preset temperature may be 35°C to 40°C, and the second preset temperature may be 10°C to 20°C.

[0106] S102: 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 higher than the second preset temperature.

[0107] In this embodiment, when the temperature of the battery module is lower than the second preset temperature, it indicates that the temperature of the battery module is low and the battery needs to be heated. At this time, the vehicle-mounted controller controls the battery heating circuit to operate and heat the battery module 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.

[0108] It can be seen from the above embodiments that the control method of the thermal management system provided in this embodiment cools the battery through a battery direct cooling circuit when the motor has a cooling demand, thereby improving the battery cooling efficiency. At the same time, 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 / or PTC heating system, and the battery module can be heated by the waste heat of the vehicle's engine 24, PTC, and motor during operation, thereby omitting the battery heating film and achieving the effect of reducing the cost and weight of the entire vehicle.

[0109] In a possible implementation, the temperature of the battery module includes a maximum battery cell temperature; the specific implementation process of S101 includes:

[0110] 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.

[0111] 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:

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] In a possible implementation, an implementation process of S102 includes:

[0121] If the battery module is in a discharging state and the temperature of the battery module is lower than a second preset temperature, the first battery heating circuit and / or the third battery heating circuit are controlled to operate.

[0122] If the battery module is in a charging state and the temperature of the battery module is lower than a second preset temperature, the second heating circuit is controlled to operate.

[0123] Specifically, when the battery module is in the charging state, the vehicle is in the non-starting state, and the motor system and the engine 24 do not generate heat, so the PTC heating system needs to be used to heat the battery module. When the battery module is in the discharging state and the vehicle is in the 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.

[0124] In this embodiment, when the battery module is in a discharging state and the temperature of the battery module 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.

[0125] 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; another specific implementation process of S102 includes:

[0126] 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 value, the first battery heating circuit is controlled to operate;

[0127] 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;

[0128] 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.

[0129] In this embodiment, when the battery module is in a discharging state, if the lowest battery cell temperature is less than the first temperature value, it means that the battery module has a heating requirement 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 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. 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.

[0130] When the battery module 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.

[0131] When the battery is in a discharging state and the battery module 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 the 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.

[0132] When the battery is in a discharging state and the battery module needs to be heated, 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.

[0133] 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.

[0134] In a possible implementation, the temperature of the battery module includes a maximum battery cell temperature and a minimum battery cell temperature; the method provided in this embodiment further includes:

[0135] When the battery direct cooling circuit is working and it is monitored that the difference between the maximum battery cell temperature and the minimum battery cell temperature is greater than a first preset difference, if the working requirement of the vehicle's PTC heating system is not monitored, the second battery heating circuit is controlled to work, and the PTC heater 19 in the second battery heating circuit is prohibited from working.

[0136] In this embodiment, the battery module includes multiple battery cells, and the temperatures of different battery cells may be different. Since the battery direct cooling circuit uses refrigerant to dissipate heat from the battery module, it will cause a large temperature difference in the battery cells when the refrigerant flow is not large. Therefore, this embodiment can give priority to determining whether the second battery heating circuit can be used to achieve rapid circulation and temperature equalization of the coolant when the difference between the highest battery cell temperature and the lowest battery cell temperature is greater than the first preset difference. Specifically, the on-board controller monitors whether the PTC heating system has a heating demand, that is, whether the PTC heater 19 is in a working state. If the PTC heater 19 is not in a working state, while the battery direct cooling circuit is working, the second battery heating circuit is controlled to work, and the PTC heater 19 in the second battery heating circuit is controlled to be prohibited from working until it is detected that the PTC heating system has a working demand, then the second battery heating circuit is controlled to stop working, and the prohibition of the PTC heater 19 is lifted. Among them, when the PTC of the second battery heating circuit is not working, the first water pump 18 can realize the rapid circulation of the coolant. Through the heat exchange between 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 can be evenly heated and quickly cooled.

[0137] In one possible implementation, when the battery direct cooling circuit is working and it is monitored that the difference between the maximum battery cell temperature and the minimum battery cell temperature is greater than a first preset difference, if it is monitored that the vehicle's PTC heating system has a working requirement and the difference between the battery minimum temperature and the motor temperature is greater than a third temperature difference, the battery liquid cooling circuit is controlled to operate.

[0138] In this embodiment, when the difference between the highest battery cell temperature and the lowest battery cell temperature is greater than the first preset difference, if the PTC heater 19 is in working state, the battery liquid cooling circuit can be used to equalize the temperature of the battery module. Specifically, the on-board controller needs to monitor whether the difference between the lowest battery temperature and the motor temperature is greater than the third temperature difference. If so, it means that the coolant flowing through the motor system can equalize the temperature of the battery module. Therefore, the battery liquid cooling circuit can be controlled to work at this time. By controlling the battery liquid cooling circuit and the battery direct cooling circuit to work at the same time, the battery module can be quickly cooled down by the battery direct cooling circuit, and the battery module can be equalized in temperature by the battery liquid cooling circuit. At the same time, based on the structural relationship between the refrigerant flow channel and the coolant flow channel in the dual-medium cold plate 11, there is a heat exchange effect between the two, so the refrigerant flow channel can cool down the coolant in the coolant flow channel, thereby accelerating the rapid equalization of the temperature of the battery module 12 by the battery liquid cooling circuit.

[0139] In a possible implementation, when the battery direct cooling circuit is operating, if it is monitored that the battery module has a thermal runaway fault, the battery liquid cooling circuit is controlled to operate, and the battery direct cooling circuit is controlled to stop operating.

[0140] In this embodiment, when a thermal runaway fault occurs in the battery, the high-voltage compressor 2 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.

[0141] 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.

[0142] 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.

[0143] Figure 3 The following is a schematic diagram showing the structure of a control device for a thermal management system of a battery provided in an embodiment of the present application. For ease of explanation, only the parts related to the embodiment of the present application are shown, which are described in detail as follows:

[0144] like Figure 3 As shown, the control device 100 of the thermal management system of the battery includes:

[0145] The battery direct cooling module 110 is used to control the battery direct cooling circuit to operate when the temperature of the battery module of the vehicle is greater than a first preset temperature;

[0146] A battery heating module 120, used to control the battery heating circuit to operate when the temperature of the battery module is lower than a second preset temperature;

[0147] Wherein, the first preset temperature is greater than the second preset temperature.

[0148] In a possible implementation, the temperature of the battery module includes a maximum battery cell temperature; the battery direct cooling module is specifically used for:

[0149] 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.

[0150] In a possible implementation, the control device 100 of the battery thermal management system further includes a battery liquid cooling module for:

[0151] 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.

[0152] 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; the battery heating module 120 includes:

[0153] 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 value, the first battery heating circuit is controlled to operate;

[0154] 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;

[0155] 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.

[0156] In a possible implementation, the temperature of the battery module includes a maximum battery cell temperature and a minimum battery cell temperature; the control device 100 of the battery thermal management system further includes:

[0157] a first temperature averaging module, for controlling the second battery heating circuit to operate, and controlling the PTC heater 19 in the second battery heating circuit to prohibit operation, when the battery direct cooling circuit operates and the difference between the highest battery core temperature and the lowest battery core temperature is greater than a first preset difference, if the operating requirement of the vehicle's PTC heating system is not detected;

[0158] A second temperature averaging module is used for controlling the battery liquid cooling circuit to operate when the battery direct cooling circuit operates and the difference between the highest battery core temperature and the lowest battery core temperature is greater than a first preset difference, if it is monitored that the vehicle's PTC heating system has an operating requirement and the difference between the battery lowest temperature and the motor temperature is greater than a third temperature difference;

[0159] The thermal runaway management module is used to control the battery liquid cooling circuit to operate and control the battery direct cooling circuit to stop operating if a thermal runaway fault is detected in the battery module when the battery direct cooling circuit is operating.

[0160] 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 controller, 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.

[0161] Figure 4 is a schematic diagram of a controller provided in an embodiment of the present application. Figure 4 As shown, the controller 4 of this embodiment includes: a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program 42, the steps of the control method of the thermal management system of each battery described above are implemented, such as Figure 2 Alternatively, when the processor 40 executes the computer program 42, the functions of each module / unit in the above-mentioned device embodiments are realized, for example Figure 3 The functions of the modules 110 to 120 are shown.

[0162] Exemplarily, the computer program 42 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 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 42 in the controller 4.

[0163] The controller 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will appreciate that Figure 4 It is only an example of the controller 4 and does not constitute a limitation of the controller 4. 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.

[0164] The processor 40 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.

[0165] The memory 41 may be an internal storage unit of the controller 4, such as a hard disk or memory of the controller 4. The memory 41 may also be an external storage device of the controller 4, 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 4. Further, the memory 41 may also include both an internal storage unit of the controller 4 and an external storage device. The memory 41 is used to store the computer program and other programs and data required by the controller. The memory 41 may also be used to temporarily store data that has been output or is to be output.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] In addition, the features of the embodiments shown in the drawings of the present application or 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.

[0174] 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 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 battery heating circuit includes 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 selectively 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 battery thermal management system also includes a battery liquid cooling circuit; The battery liquid cooling circuit includes the dual-medium cold plate and the motor liquid cooling system; The coolant flow channel and the motor liquid cooling system are connected to form the battery liquid cooling circuit.

3. The thermal management system of a battery according to claim 2, characterized in that: The motor liquid cooling system includes a motor system, a motor water pump and a radiator; the battery liquid cooling circuit also includes 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 four-way valve, the fourth end of the four-way valve 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 second end of the motor water pump, the second end of the four-way valve is communicated with the first end of the coolant flow channel, and the second end of the coolant flow channel is communicated with the third end of the four-way valve; 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.

4. 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 four-way valve, the fourth end of the four-way valve 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 second end of the motor water pump, the second end of the four-way valve is communicated with the first end of the coolant flow channel, and the second end of the coolant flow channel is communicated with the third end of the four-way valve; 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.

5. The thermal management system of a battery according to claim 4, 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 second end of the coolant flow channel, the first end of the coolant flow channel 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.

6. The thermal management system of a battery according to claim 5, 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 second end of the coolant flow channel, the first end of the coolant flow channel 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.

7. The thermal management system of a battery according to any one of claims 1 to 6, 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.

8. A method for controlling a thermal management system of a battery, characterized in that: A thermal management system for a battery as claimed in any one of claims 1 to 7, the method comprising: 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; 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.

9. The control method of the battery thermal management system according to claim 8, characterized in that: 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: 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.

10. The control method of the battery thermal management system according to claim 9, characterized in that: When the maximum battery core temperature 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 the target temperature, the battery liquid cooling circuit is controlled to operate.

11. The control method of the battery thermal management system according to claim 8, 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.

12. The control method of the battery thermal management system according to claim 8, characterized in that: The temperature of the battery module includes a maximum battery cell temperature and a minimum battery cell temperature; the method further includes: When the battery direct cooling circuit is working and the difference between the highest battery cell temperature and the lowest battery cell temperature is detected to be greater than a first preset difference, if the working requirement of the vehicle's PTC heating system is not detected, the second battery heating circuit is controlled to work, and the PTC heater in the second battery heating circuit is controlled to be prohibited from working; When the battery direct cooling circuit is working and it is detected that the difference between the highest battery core temperature and the lowest battery core temperature is greater than a first preset difference, if it is detected that the PTC heating system of the vehicle has a working demand and the difference between the lowest battery temperature and the motor temperature is greater than a third temperature difference, the battery liquid cooling circuit is controlled to work; When the battery direct cooling circuit is working, if it is monitored that the battery module has a thermal runaway fault, the battery liquid cooling circuit is controlled to work, and the battery direct cooling circuit is controlled to stop working.

13. A vehicle, characterized in that: A thermal management system for a vehicle comprising the method according to any one of claims 1 to 7.

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