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 battery liquid cooling loop and a battery heating loop, in the battery direct cooling loop, the refrigerant flow channel is communicated with the refrigerant refrigerating system; in the battery liquid cooling loop, the cooling liquid flow channel is communicated with a radiator in the battery liquid cooling system; and in the battery heating loop, the cooling liquid flow channel is communicated with a motor branch in the battery liquid cooling system. According to the thermal management system provided by the invention, the battery module can be cooled and heated through the double-medium cold plate. Moreover, when the temperature of the motor liquid cooling system is low, the battery liquid cooling loop can be adopted to replace the battery direct cooling loop to work, and the effect of saving energy consumption is achieved. When the battery module is in a low-temperature environment, the battery is heated by active heat generation or waste heat of the motor, an electric heating film structure is omitted, 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 may cause large temperature differences in the battery cells due to low refrigerant temperature, insufficient refrigerant flow, etc. 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, comprising: a battery direct cooling circuit, a battery liquid cooling circuit, and a battery heating circuit; The battery direct cooling circuit includes a dual-medium cold plate and a refrigerant refrigeration system; the dual-medium cold plate includes a refrigerant flow channel and a coolant flow channel; The battery liquid cooling circuit includes the dual-medium cold plate and the motor liquid cooling system; the motor liquid cooling system includes a radiator; The battery heating circuit includes the dual-medium cold plate and the motor liquid cooling system; the motor liquid cooling system also includes a motor branch; In the battery direct cooling circuit, the refrigerant flow channel is connected to the refrigerant refrigeration system; In the battery liquid cooling circuit, the coolant flow channel is connected to the radiator; In the battery heating circuit, the coolant flow channel is in communication with the motor branch.

[0006] The thermal management system provided in this embodiment can dissipate heat and heat the battery module through a dual-medium cold plate. In addition, when the temperature of the motor liquid cooling system is low, the battery liquid cooling circuit can be used to replace the battery direct cooling circuit to achieve energy saving. When the battery module is in a low-temperature environment, the motor's active heat generation or waste heat is used to heat the battery, simplifying the electric heating film structure and achieving the effect of reducing the cost and weight of the entire vehicle.

[0007] In a possible implementation manner, in the battery liquid cooling circuit and the battery heating circuit, the coolant flow channel, the radiator and the motor branch are connected in series; Alternatively, the radiator and the motor branch are connected in series to form a loop, and the coolant flow channel is connected in parallel to the motor branch.

[0008] The coolant circuit in the thermal management system provided in this embodiment can realize battery liquid cooling and heating functions in the form of series connection and parallel connection, with various implementation methods and wider applicability.

[0009] In a possible implementation manner, at least one water pump is provided in the battery liquid cooling circuit and the battery heating circuit.

[0010] This embodiment can drive the coolant in the corresponding circuit to flow by arranging water pumps in different circuits, so as to achieve liquid cooling and liquid heating functions for the battery.

[0011] In a possible implementation manner, the thermal management system further includes a first three-way valve; the motor branch includes a motor system and a first water pump; In the battery liquid cooling system, the first end of the first three-way valve is communicated with the first end of the first water pump, the second end of the first water pump is communicated with the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve is communicated with the first end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator and the second end of the coolant flow channel respectively, and the second end of the radiator is communicated with the second end of the first three-way valve; In the battery heating circuit, the first end of the first three-way valve is connected to the first end of the first water pump, the second end of the first water pump is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve is connected to the first end of the coolant flow channel, and the second end of the circulating liquid pipeline of the motor system is connected to the second end of the coolant flow channel.

[0012] This embodiment connects the coolant flow channels in the dual-medium cold plate in parallel at both ends of the motor branch consisting of the motor system and the first water pump. This can not only dissipate heat from the battery module when the motor liquid cooling system is working, but also use the motor system alone to heat the battery module without passing through the branch where the radiator is located, thereby reducing heat loss.

[0013] In a possible implementation manner, the thermal management system further includes a first three-way valve and a first water pump; the motor branch includes a motor system; In the battery liquid cooling circuit, the first end of the first water pump is communicated with the first end of the first three-way valve, the third 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 radiator, and the second end of the radiator is communicated with the second end of the first water pump; In the battery heating circuit, the first end of the first water pump 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 circulating liquid pipeline of the motor system, the third end of the first three-way valve is communicated with the first end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator and the second end of the coolant flow channel respectively, and the second end of the radiator is communicated with the second end of the first water pump.

[0014] This embodiment connects the coolant flow channels in the dual-medium cold plate in parallel at both ends of the motor system, which can not only dissipate heat from the battery module when the motor liquid cooling system is working, but also use the motor system to heat the battery module when the first water pump is working. This structure only requires a small amount of modification on the basis of the existing motor liquid cooling system to achieve liquid cooling and heating of the battery module, and is easy to implement.

[0015] In a possible implementation manner, the thermal management system further includes a first three-way valve, a first water pump and a second water pump; the motor branch includes a motor system; In the battery liquid cooling circuit, the first end of the first water pump is communicated with the first end of the first three-way valve, the third end of the first three-way valve is communicated with the first end of the second water pump, the second end of the second water pump 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 radiator, and the second end of the radiator is communicated with the second end of the first water pump; In the battery heating circuit, the second end of the first three-way valve is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve is connected to the first end of the second water pump, the second end of the second water pump is connected to the first end of the coolant flow channel, and the second end of the circulating liquid pipeline of the motor system is connected to the second end of the coolant flow channel.

[0016] In this embodiment, the coolant flow channel in the dual-medium cold plate is connected in parallel to the two ends of the motor system, and a second water pump is provided on the branch where the coolant flow channel is located. When the battery module needs to be heated, the motor system can be used alone to heat the battery module without passing through the branch where the radiator is located, thereby reducing heat loss.

[0017] In a possible implementation manner, the thermal management system further includes a first three-way valve and a second water pump; the motor branch includes a motor system and a first water pump; In the battery liquid cooling circuit, the third end of the first three-way valve is communicated with the first end of the second water pump, the second end of the second water pump 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 radiator, and the second end of the radiator is communicated with the second end of the first three-way valve; In the battery heating circuit, the first end of the first three-way valve is connected to the first end of the first water pump, the second end of the first water pump 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 second end of the coolant flow channel, the first end of the coolant flow channel is connected to the second end of the second water pump, and the first end of the second water pump is connected to the third end of the first three-way valve.

[0018] In this embodiment, based on connecting the coolant flow channel in the dual-medium cold plate in parallel at both ends of the motor branch, a second water pump is arranged on the branch where the coolant flow channel is located. When the battery module needs to be heated, the motor system can be used alone to heat the battery module without passing through the branch where the radiator is located, thereby reducing heat loss; when the battery module needs to be cooled, the radiator can be used alone to cool the battery module without passing through the motor system, thereby reducing cold loss.

[0019] In a possible implementation manner, a PTC heater is connected in series between the motor branch and the coolant flow channel.

[0020] This embodiment provides a PTC heater on the branch where the coolant flow channel is located. When the heat generated or waste heat of the motor system does not meet the heating demand of the battery module, the heat can be supplemented by the PTC heater to meet the heating demand of the battery module.

[0021] In a possible implementation, the thermal management system further includes a first water pump and a four-way valve; In the battery liquid cooling circuit and the battery heating circuit, the first end of the first water pump 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 circulating liquid pipeline of the motor system, the third end of the four-way valve is communicated with the first end of the coolant flow channel, the fourth end of the four-way valve is communicated with the second end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator, and the second end of the radiator is communicated with the second end of the first water pump; the first end and the third end of the four-way valve are communicated, and the second end and the fourth end of the four-way valve are communicated.

[0022] In this embodiment, a four-way valve is provided to connect the coolant flow channel and the original motor liquid cooling system in series to form a loop, and the battery liquid cooling and battery heating functions are realized through the loop. The structure is simple and easy to implement.

[0023] In a possible implementation, the refrigerant refrigeration system further 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.

[0024] This embodiment can achieve rapid cooling of the battery module through the battery direct cooling circuit.

[0025] In a second aspect, an embodiment of the present invention provides a control method for a thermal management system of a battery, which is applied to the thermal management system of the battery as described in the first aspect above, and the method includes: When the temperature of the battery module of the vehicle is greater than a first preset temperature, controlling the battery direct cooling circuit and / or the battery liquid cooling circuit to operate according to the relationship between the motor temperature and the temperature of the battery module; 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.

[0026] The control method of the thermal management system provided in this embodiment determines whether to use a battery liquid cooling circuit or a battery direct cooling circuit based on the motor temperature when the battery has a cooling demand, so as to comprehensively control the cooling effect of the battery, and use the battery liquid cooling circuit to cooperate with the battery direct cooling circuit, thereby achieving the effect of saving energy consumption; when the battery has a heating demand, the battery module is heated by the waste heat or active heat generated by the motor during operation, thereby simplifying the battery heating film and achieving the effect of reducing the cost and weight of the entire vehicle.

[0027] 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, the battery direct cooling circuit and / or the battery liquid cooling circuit is controlled to operate according to the relationship between the motor temperature and the temperature of the battery module, including: when the maximum battery cell temperature is greater than the first preset temperature, if the motor temperature is less than a target temperature, the battery liquid cooling circuit is controlled to operate; When the highest battery cell temperature is greater than a first preset temperature, if the motor temperature is not less than the target temperature, the battery direct cooling circuit is controlled to operate.

[0028] 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.

[0029] 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; when the temperature of the battery module is less than the second preset temperature, controlling the battery heating circuit to operate includes: If the battery module is in a discharging state, and 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 higher than the first temperature difference, the battery heating circuit is controlled to operate, so as to heat the battery module by waste heat when the motor is operating normally; If the battery module is in a charging state and the lowest battery cell temperature is less than the second temperature value, the battery heating circuit is controlled to operate, and the heat generated by the motor stall is controlled to heat the battery module.

[0030] In this embodiment, when the battery module is in different working states and has heating requirements, the working state of the motor system is adjusted based on the motor temperature, so that the battery heating circuit can meet the heating requirements under different working states of the battery.

[0031] In a possible implementation, the temperature of the battery module further includes a minimum battery cell temperature; when the maximum battery cell temperature is greater than a first preset temperature, if the motor temperature is not less than a target temperature, controlling the battery direct cooling circuit to operate includes: When the maximum battery cell temperature is greater than the first preset temperature, if the motor temperature is not less than the target temperature, the difference between the maximum battery cell temperature and the minimum battery cell temperature is greater than the second temperature difference, and the difference between the battery minimum temperature and the motor temperature is greater than the third temperature difference, the battery direct cooling circuit and the battery liquid cooling circuit are controlled to operate simultaneously.

[0032] This embodiment can achieve a uniform temperature drop effect on the battery module by controlling the battery direct cooling circuit and the battery liquid cooling circuit to work simultaneously.

[0033] In a possible implementation manner, the method provided in this embodiment further includes: When the battery direct cooling circuit is working, if it is monitored that the battery module has a thermal runaway fault, the battery direct cooling circuit is controlled to stop working, and the battery liquid cooling circuit is controlled to work.

[0034] This embodiment controls the battery direct cooling circuit to stop working when thermal runaway occurs in the battery module, thereby ensuring safe and stable operation of the battery thermal management system.

[0035] In a third aspect, the present application provides a vehicle, which includes a battery thermal management system as described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] Figure 1 This is a schematic diagram of the first structure of a thermal management system for a battery provided in an embodiment of the present application; Figure 2 This is a second structural schematic diagram of a battery thermal management system provided in an embodiment of the present application; Figure 3 is a third structural schematic diagram of a battery thermal management system provided in an embodiment of the present application; Figure 4 is a fourth structural schematic diagram of a thermal management system for a battery provided in an embodiment of the present application; Figure 5 This is a fifth structural schematic diagram of the thermal management system of the battery provided in the embodiment of the present application; Figure 6 This is a sixth structural schematic diagram of a battery thermal management system provided in an embodiment of the present application; Figure 7 is a flow chart for implementing a control method of a battery thermal management system provided in an embodiment of the present application; Figure 8 is a schematic diagram of a controller provided in an embodiment of the present application; superior Figures 1 to 6 The meanings of the reference numerals in the figure are as follows: 1. Low-temperature radiator; 2. Condenser; 5. Overflow tank; 6. First 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. PTC heater; 27. Voltage sensor; 28. First three-way valve; 29. ​​Second water pump; 30. Four-way valve. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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 battery liquid cooling circuit and a battery heating circuit; The battery direct cooling circuit includes a dual-medium cold plate and a refrigerant refrigeration system; the dual-medium cold plate 11 includes a refrigerant flow channel and a coolant flow channel; The battery liquid cooling circuit includes the dual-medium cold plate 11 and the motor liquid cooling system; the motor liquid cooling system includes a radiator; The battery heating circuit includes the dual-medium cold plate 11 and the motor liquid cooling system; the motor liquid cooling system includes a motor branch; In the battery direct cooling circuit, the refrigerant flow channel is connected to the refrigerant refrigeration system; In the battery liquid cooling circuit, the coolant flow channel is connected to the radiator; In the battery heating circuit, the coolant flow channel is in communication with the motor branch.

[0041] 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.

[0042] 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 are connected to the motor liquid cooling system. The radiator in the motor liquid cooling system can be used to cool the coolant to achieve heat dissipation of the battery module 12. The coolant can also be heated by the heat generated by the motor system in the motor liquid cooling system to achieve heating of the battery module 12.

[0043] 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 module 12, thereby achieving rapid cooling 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. When the battery module 12 is in a low-temperature environment, the battery can also be heated by the active heat generation or waste heat of the motor through the battery heating circuit, which simplifies the electric heating film structure and achieves the effect of reducing the cost and weight of the whole vehicle.

[0044] In a possible implementation manner, in the battery liquid cooling circuit and the battery heating circuit, the coolant flow channel, the radiator and the motor branch are connected in series; Alternatively, the radiator and the motor branch are connected in series to form a loop, and the coolant flow channel is connected in parallel to the motor branch.

[0045] In this embodiment, the motor liquid cooling system includes a radiator and a motor branch, and the motor branch includes a motor system. In a conventional motor liquid cooling system, the radiator and the motor branch are connected in series to form a loop, and the radiator is used to dissipate heat for the motor system in the motor branch. The motor system includes an OBC (On board charger), a motor, a PDU (Power Distribution Unit, motor controller) 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, and the OBC, PDU, DCDC rectifier circuit, motor 9, low-temperature radiator 1 and overflow tank 5 are connected in series to form a loop. The low-temperature radiator 1 is used to dissipate the heat of the coolant flowing through the low-temperature radiator 1 to the external environment.

[0046] As an implementation of this embodiment, the coolant flow channel can be connected in series to the circuit of the motor liquid cooling system, so that the radiator, the motor branch and the coolant flow channel are connected to form a circuit, so that when the battery module 12 needs to be heated, the coolant is heated by the active heat generation or waste heat of the motor system, and then flows into the coolant flow channel to heat the battery module 12. At this time, the low-temperature radiator 1 does not work. When the battery module 12 needs to dissipate heat, the coolant is cooled by the radiator and then flows into the coolant flow channel to dissipate heat for the battery module 12.

[0047] As another implementation method of this embodiment, the coolant flow channel can be connected in parallel with the motor branch in the motor liquid cooling system. After parallel connection, the motor branch and the coolant flow channel can form a loop, and the radiator and the coolant flow channel can also form a loop. In this way, when the battery module 12 needs to be heated, the coolant is heated by the motor system in the motor branch, and then enters the coolant flow channel to heat the battery module 12. At this time, the low-temperature radiator 1 does not work; when the battery module 12 needs to dissipate heat, the low-temperature radiator 1 cools the motor system while cooling the motor system, and at the same time, the cooled coolant flows into the coolant flow channel of the dual-medium cold plate 11 through a channel parallel to the motor system to cool the battery module 12.

[0048] In a possible implementation manner, at least one water pump is provided in the battery liquid cooling circuit and the battery heating circuit.

[0049] Specifically, at least one water pump in the battery heating circuit and the battery liquid cooling circuit can be the same or different. By arranging water pumps in different circuits, the coolant in the corresponding circuit can be driven to flow, so as to achieve the heating and heat dissipation functions of the battery. Specifically, the number of water pumps in the battery heating circuit and the battery liquid cooling circuit can be determined based on the required size of the coolant hydraulic pressure.

[0050] In one possible implementation, Figure 1 As shown, the thermal management system further includes a first three-way valve 28; the motor branch includes a motor system and a first water pump 6; In the battery liquid cooling system, the first end of the first three-way valve 28 is communicated with the first end of the first water pump 6, the second end of the first water pump 6 is communicated with the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve 28 is communicated with the first end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator and the second end of the coolant flow channel respectively, and the second end of the radiator is communicated with the second end of the first three-way valve 28; In the battery heating circuit, the first end of the first three-way valve 28 is connected to the first end of the first water pump 6, the second end of the first water pump 6 is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve 28 is connected to the first end of the coolant flow channel, and the second end of the circulating liquid pipeline of the motor system is connected to the second end of the coolant flow channel.

[0051] In this embodiment, if Figure 1As shown, the first end of the first three-way valve 28 is connected to the first end of the first water pump 6, the second end of the first three-way valve 28 is connected to the overflow tank 5, the third end of the first three-way valve 28 is connected to the first end of the coolant flow channel, the second end of the first water pump 6 is connected to the first end of the circulating liquid pipeline of the battery system, the second end of the circulating liquid pipeline of the motor system is respectively connected to the first end of the low-temperature radiator 1 and the second end of the coolant flow channel, and the second end of the low-temperature radiator 1 is connected to the overflow tank 5. Among them, a temperature sensor 8 is provided on the circulating liquid pipeline between the DCDC rectifier circuit in the motor system and the motor.

[0052] In this embodiment, the coolant flow direction of the battery liquid cooling circuit is as follows: the coolant flows out from the first water pump 6, flows through the motor system and enters the low-temperature radiator 1. After the heat is dissipated by the low-temperature radiator 1, the cooled coolant returns to the first water pump 6 through the overflow tank 5 and the first three-way valve 28. At the first three-way valve 28, the coolant flows through the coolant flow channel and then merges into the low-temperature radiator 1.

[0053] In this embodiment, the coolant flow direction of the battery heating circuit is as follows: the coolant flows out from the first water pump 6 , flows through the motor system, the coolant flow channel, the first three-way valve 28 , and then returns to the first water pump 6 .

[0054] In this embodiment, when the battery liquid cooling circuit and the battery direct cooling circuit are working at the same time, the low-temperature radiator 1 in the battery liquid cooling circuit may not work, and the battery module 12 is quickly cooled down through the refrigerant flow channel in the dual-medium cold plate 11. At the same time, after the coolant flow channel and the refrigerant flow channel in the dual-medium cold plate 11 undergo heat exchange, the coolant temperature in the coolant flow channel will also decrease. The first water pump 6 is used to make the coolant in the battery liquid cooling circuit flow quickly to take away the temperature of the battery module 12, thereby realizing the temperature equalization function of the battery module 12.

[0055] This embodiment connects the coolant flow channels in the dual-medium cold plate in parallel at both ends of the motor branch consisting of the motor system and the first water pump. This can not only dissipate heat from the battery module when the motor liquid cooling system is working, but also use the motor system alone to heat the battery module without passing through the branch where the radiator is located, thereby reducing heat loss.

[0056] In one possible implementation, Figure 2 As shown, the thermal management system further includes a first three-way valve 28 and a first water pump 6; the motor branch includes a motor system; In the battery liquid cooling circuit, the first end of the first water pump 6 is communicated with the first end of the first three-way valve 28, the third end of the first three-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 radiator, and the second end of the radiator is communicated with the second end of the first water pump 6; In the battery heating circuit, the first end of the first water pump 6 is connected to the first end of the first three-way valve 28, the second end of the first three-way valve 28 is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve 28 is connected to the first end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is connected to the first end of the radiator and the second end of the coolant flow channel respectively, and the second end of the radiator is connected to the second end of the first water pump 6.

[0057] In this embodiment, if Figure 2 As shown, the first end of the first water pump 6 is connected to the first end of the first three-way valve 28, the second end of the first water pump 6 is connected to the overflow tank 5, the third end of the first three-way valve 28 is connected to the first end of the coolant flow channel, the second end of the first three-way valve 28 is connected to the first end of the circulating liquid pipeline of the battery system, the second end of the circulating liquid pipeline of the motor system is respectively connected to the first end of the low-temperature radiator 1 and the second end of the coolant flow channel, and the second end of the low-temperature radiator 1 is connected to the overflow tank 5. Among them, a temperature sensor is provided on the circulating liquid pipeline between the DCDC rectifier circuit in the motor system and the motor.

[0058] In this embodiment, the coolant flow direction of the battery liquid cooling circuit is: the coolant flows out from the first water pump 6, flows through the first three-way valve 28, the motor system, the low-temperature radiator 1 and the overflow tank 5 and returns to the first water pump 6. At the first three-way valve 28, the coolant flows through the coolant flow channel and then flows into the low-temperature radiator 1.

[0059] In this embodiment, the coolant flow direction of the battery heating circuit is: the coolant flows out from the first water pump 6, flows through the first three-way valve 28, the motor system, the low-temperature radiator 1 and the overflow tank 5 and returns to the first water pump 6. At the first three-way valve 28, the coolant flows through the coolant flow channel and then flows into the low-temperature radiator 1.

[0060] In this embodiment, when the low-temperature radiator 1 in the battery liquid cooling circuit is not working, the battery liquid cooling circuit can realize the temperature equalization function of the battery module 12. At this time, the battery liquid cooling circuit and the battery direct cooling circuit work simultaneously to achieve rapid cooling and temperature equalization of the battery module 12.

[0061] This embodiment connects the coolant flow channels in the dual-medium cold plate in parallel at both ends of the motor system, which can not only dissipate heat from the battery module when the motor liquid cooling system is working, but also use the motor system to heat the battery module when the first water pump is working. This structure only requires a small amount of modification on the basis of the existing motor liquid cooling system to achieve liquid cooling and heating of the battery module, and is easy to implement.

[0062] In one possible implementation, Figure 3As shown, the thermal management system further includes a first three-way valve 28, a first water pump 6 and a second water pump 29; the motor branch includes a motor system; In the battery liquid cooling circuit, the first end of the first water pump 6 is communicated with the first end of the first three-way valve 28, the third end of the first three-way valve 28 is communicated with the first end of the second water pump 29, the second end of the second water pump 29 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 radiator, and the second end of the radiator is communicated with the second end of the first water pump 6; In the battery heating circuit, the second end of the first three-way valve 28 is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve 28 is connected to the first end of the second water pump 29, the second end of the second water pump 29 is connected to the first end of the coolant flow channel, and the second end of the circulating liquid pipeline of the motor system is connected to the second end of the coolant flow channel.

[0063] In this embodiment, if Figure 3 As shown, the first end of the first water pump 6 is connected to the first end of the first three-way valve 28, the second end of the first water pump 6 is connected to the overflow tank 5, the third end of the first three-way valve 28 is connected to the first end of the second water pump 29, the second end of the second water pump 29 is connected to the first end of the coolant flow channel, the second end of the first three-way valve 28 is connected to the first end of the circulating liquid pipeline of the battery system, the second end of the circulating liquid pipeline of the motor system is respectively connected to the first end of the low-temperature radiator 1 and the second end of the coolant flow channel, and the second end of the low-temperature radiator 1 is connected to the overflow tank 5. Among them, a temperature sensor is provided on the circulating liquid pipeline between the DCDC rectifier circuit in the motor system and the motor.

[0064] In this embodiment, the coolant flow direction of the battery liquid cooling circuit is: the coolant flows out from the second water pump 29, flows through the coolant flow channel, the low-temperature radiator 1, the overflow tank 5, the first water pump 6, the first three-way valve 28, and then returns to the second water pump 29.

[0065] In this embodiment, the coolant flow direction of the battery heating circuit is as follows: the coolant flows out from the circulating liquid pipeline of the motor system, flows through the coolant flow channel, the second water pump 29, and the first three-way valve 28, and then returns to the circulating liquid pipeline of the motor system.

[0066] In this embodiment, when the low-temperature radiator 1 in the battery liquid cooling circuit is not working, the battery liquid cooling circuit can realize the temperature equalization function of the battery module 12. At this time, the battery liquid cooling circuit and the battery direct cooling circuit work simultaneously to achieve rapid cooling and temperature equalization of the battery module 12.

[0067] In this embodiment, the coolant flow channel in the dual-medium cold plate is connected in parallel to the two ends of the motor system, and a second water pump is provided on the branch where the coolant flow channel is located. When the battery module needs to be heated, the motor system can be used alone to heat the battery module without passing through the branch where the radiator is located, thereby reducing heat loss.

[0068] In one possible implementation, Figure 4 As shown, the thermal management system further includes a first three-way valve 28 and a second water pump 29; the motor branch includes a motor system and a first water pump 6; In the battery liquid cooling circuit, the third end of the first three-way valve 28 is communicated with the first end of the second water pump 29, the second end of the second water pump 29 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 radiator, and the second end of the radiator is communicated with the second end of the first three-way valve 28; In the battery heating circuit, the first end of the first three-way valve 28 is connected to the first end of the first water pump 6, the second end of the first 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 second end of the coolant flow channel, the first end of the coolant flow channel is connected to the second end of the second water pump 29, and the first end of the second water pump 29 is connected to the third end of the first three-way valve 28.

[0069] In this embodiment, if Figure 4 As shown, the first end of the first three-way valve 28 is connected to the first end of the first water pump 6, the second end of the first three-way valve 28 is connected to the overflow tank 5, the third end of the first three-way valve 28 is connected to the first end of the second water pump 29, the second end of the second water pump 29 is connected to the first end of the coolant flow channel, the second end of the first water pump 6 is connected to the first end of the circulating liquid pipeline of the battery system, the second end of the circulating liquid pipeline of the motor system is respectively connected to the first end of the low-temperature radiator 1 and the second end of the coolant flow channel, and the second end of the low-temperature radiator 1 is connected to the overflow tank 5. Among them, a temperature sensor is provided on the circulating liquid pipeline between the DCDC rectifier circuit in the motor system and the motor.

[0070] In this embodiment, the coolant flow direction of the battery coolant circuit is as follows: the coolant flows out from the second water pump 29, flows through the first three-way valve 28, the overflow tank 5, the low-temperature radiator 1, the coolant flow channel, and then returns to the second water pump 29.

[0071] In this embodiment, the coolant flow direction of the battery heating circuit is as follows: after the coolant flows out of the second water pump 29 , it flows through the first three-way valve 28 , the first water pump 6 , the motor system, the coolant flow channel, and then returns to the second water pump 29 .

[0072] In this embodiment, when the low-temperature radiator 1 in the battery liquid cooling circuit is not working, the battery liquid cooling circuit can realize the temperature equalization function of the battery module 12. At this time, the battery liquid cooling circuit and the battery direct cooling circuit work simultaneously to achieve rapid cooling and temperature equalization of the battery module 12.

[0073] In this embodiment, based on connecting the coolant flow channel in the dual-medium cold plate in parallel at both ends of the motor branch, a second water pump is arranged on the branch where the coolant flow channel is located. When the battery module needs to be heated, the motor system can be used alone to heat the battery module without passing through the branch where the radiator is located, thereby reducing heat loss; when the battery module needs to be cooled, the radiator can be used alone to cool the battery module without passing through the motor system, thereby reducing cold loss.

[0074] In a possible implementation manner, a PTC (Positive Temperature Coefficient) heater 18 is connected in series between the motor branch and the coolant flow channel.

[0075] In this embodiment, reference Figure 5 A PTC heater 18 is connected in series between the circulating fluid pipeline and the coolant flow channel. When the temperature of the circulating fluid pipeline of the motor system is low and the motor waste heat cannot be used to heat the battery, the PTC heater can be used to heat the battery module 12.

[0076] In this embodiment, the PTC heater 18 is specifically a water-heating driven PTC heater.

[0077] Specifically, when the PTC heater 18 heats the battery module 12, the flow direction of the coolant is as follows: the coolant heated by the PTC heater 18 flows into the coolant flow channel, flows out of the coolant flow channel, and then returns to the PTC heater 18 after passing through the first three-way valve 28, the first water pump 6 and the circulating liquid pipeline of the motor system.

[0078] It is understandable that the PTC heater can also be set as follows Figures 2 to 4 Between the circulating liquid pipeline and the coolant flow channel in the thermal management system of the battery described in any one of the items.

[0079] Specifically, when the PTC heater is added to Figure 2 In the thermal management system shown, when the PTC heater heats the battery module 12, the flow direction of the coolant is as follows: the coolant heated by the PTC heater flows into the coolant flow channel, and after flowing out of the coolant flow channel, it passes through the first three-way valve 28 and the circulating liquid pipeline of the motor system and is divided into two paths, one path returns to the PTC heater, and the other path passes through the low-temperature radiator 1 and the overflow tank 5 and returns to the first water pump 6.

[0080] When the PTC heater is added Figure 3In the thermal management system shown, when the PTC heater heats the battery module 12, the flow direction of the coolant is as follows: the coolant heated by the PTC heater flows into the coolant channel after passing through the circulating liquid pipeline of the motor system, the first three-way valve 28, and the second water pump 29, and then flows out of the coolant channel and returns to the PTC heater.

[0081] When the PTC heater is added Figure 4 In the thermal management system shown, when the PTC heater heats the battery module 12, the flow direction of the coolant is as follows: the coolant heated by the PTC heater flows into the coolant flow channel, flows out of the coolant flow channel, passes through the second water pump 29, the first three-way valve 28, the first water pump 6, and the circulating liquid pipeline of the motor system, and then returns to the PTC heater.

[0082] This embodiment provides a PTC heater on the branch where the coolant flow channel is located. When the heat generated or waste heat of the motor system does not meet the heating demand of the battery module, the heat can be supplemented by the PTC heater to meet the heating demand of the battery module.

[0083] In one possible implementation, Figure 6 As shown, the motor liquid cooling system further includes a first water pump 6 and a four-way valve 30; In the battery liquid cooling circuit and the battery heating circuit, the first end of the first water pump 6 is connected to the first end of the four-way valve 30, the second end of the four-way valve 30 is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the four-way valve 30 is connected to the first end of the coolant flow channel, the fourth end of the four-way valve 30 is connected to the second end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is connected to the first end of the radiator, and the second end of the radiator is connected to the second end of the first water pump 6; the first end and the third end of the four-way valve 30 are connected, and the second end and the fourth end of the four-way valve 30 are connected.

[0084] In this embodiment, if Figure 6 As shown, the first end of the first water pump 6 is connected to the first end of the four-way valve 30, the second end of the four-way valve 30 is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the four-way valve 30 is connected to the first end of the coolant flow channel, the fourth end of the four-way valve 30 is connected to the second end of the coolant flow channel, 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, and the second end of the overflow tank 5 is connected to the second end of the first water pump 6; wherein the first end and the third end of the four-way valve 30 are connected, and the second end and the fourth end of the four-way valve 30 are connected.

[0085] In this embodiment, the coolant flow direction of the battery coolant circuit is: the coolant flows out from the first water pump 6, flows through the four-way valve 30, the coolant flow channel, the four-way valve 30, the motor system, the low-temperature radiator 1, the overflow tank 5 and then returns to the first water pump 6.

[0086] In this embodiment, the coolant flow direction of the battery heating circuit is: the coolant flows out from the first water pump 6, flows through the four-way valve 30, the coolant flow channel, the four-way valve 30, the motor system, the low-temperature radiator 1, the overflow tank 5 and then returns to the first water pump 6.

[0087] In this embodiment, when the low-temperature radiator 1 in the battery liquid cooling circuit is not working, the battery liquid cooling circuit can realize the temperature equalization function of the battery module 12. At this time, the battery liquid cooling circuit and the battery direct cooling circuit work simultaneously to achieve rapid cooling and temperature equalization of the battery module 12.

[0088] In this embodiment, a four-way valve is provided to connect the coolant flow channel and the original motor liquid cooling system in series to form a loop, and the battery liquid cooling and battery heating functions are realized through the loop. The structure is simple and easy to implement.

[0089] In a possible implementation, the refrigerant refrigeration system further includes an evaporator (EVP) 16 , a compressor 17 , and a condenser 2 ; 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 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 17, and the second end of the compressor 17 is connected to the second end of the condenser 2.

[0090] In this embodiment, the battery direct cooling circuit further includes a solenoid valve 10 , a solenoid valve 15 , a temperature and pressure sensor 14 , and a pressure sensor 27 .

[0091] Specifically, the first end of the refrigerant flow channel is communicated with the first end of the solenoid valve 10, the second end of the solenoid valve 10 is communicated with the first end of the solenoid valve 15 and the condenser 2 respectively, the second end of the 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.

[0092] See also Figure 7 , 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: S101: When the temperature of the battery module 12 of the vehicle is greater than a first preset temperature, the battery direct cooling circuit and / or the battery liquid cooling circuit are controlled to operate according to a relationship between the motor temperature and the temperature of the battery module 12 .

[0093] 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.

[0094] 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. A second temperature sensor is provided at the outlet of the circulating fluid pipeline of the motor module, and the motor temperature is collected by the second temperature sensor, and the motor temperature 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, it can be determined based on the motor temperature whether to use the motor liquid cooling system to cool the battery module 12 or the refrigerant direct cooling system to cool the battery module 12. Among them, 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.

[0095] Specifically, the first preset temperature may be 35°C to 40°C, and the second preset temperature may be 10°C to 20°C.

[0096] 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.

[0097] 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 or active heat generation of the motor system.

[0098] The control method of the thermal management system provided in this embodiment determines whether to use a battery liquid cooling circuit or a battery direct cooling circuit based on the motor temperature when the battery has a cooling demand, so as to comprehensively control the cooling effect of the battery, and use the battery liquid cooling circuit to cooperate with the battery direct cooling circuit, thereby achieving the effect of saving energy consumption; when the battery has a heating demand, the battery module is heated by the waste heat or active heat generated by the motor during operation, thereby simplifying the battery heating film and achieving the effect of reducing the cost and weight of the entire vehicle.

[0099] In a possible implementation, the temperature of the battery module 12 includes a maximum battery cell temperature; the specific implementation process of S101 includes: S201: when the maximum battery cell temperature is greater than a first preset temperature, if the motor temperature is less than a target temperature, controlling the battery liquid cooling circuit to operate; S202: When the highest battery cell temperature is greater than a first preset temperature, if the motor temperature is not less than the target temperature, control the battery direct cooling circuit to operate.

[0100] When the highest cell temperature is greater than the first preset temperature, that is, the battery module 12 has a cooling demand, 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, when the conditions in S201 are met, the on-board controller uses the 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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 specific implementation process of S102 includes: If the battery module 12 is in a discharging state, and 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 higher than the first temperature difference, the battery heating circuit is controlled to operate, and the battery module 12 is heated by waste heat during normal operation of the motor; If the battery module 12 is in a charging state and the lowest battery cell temperature is less than the second temperature value, the battery heating circuit is controlled to operate, and the heat generated by the motor stall is controlled to heat the battery module 12 .

[0108] Specifically, since the battery module 12 is in a charging state and the vehicle is not started, the motor system is not working and cannot generate waste heat. At this time, if the lowest battery cell temperature is less than the second temperature value, it means that the battery module 12 has a heating demand, and the motor system needs to be controlled to block and actively generate heat to heat the battery module 12.

[0109] When the battery module 12 is in a discharging state and the vehicle is in a starting 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. 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 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.

[0110] When the battery is in a discharging state and the minimum battery cell temperature is lower than the first temperature value, if the motor temperature is not lower 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, if the thermal management system of the battery includes a PTC heater, the PTC heater is controlled to work to heat the battery module 12.

[0111] In this embodiment, when the battery module is in different working states and has heating requirements, the working state of the motor system is adjusted based on the motor temperature, so that the battery heating circuit can meet the heating requirements under different working states of the battery.

[0112] In a possible implementation manner, the temperature of the battery module also includes a minimum battery cell temperature; the specific implementation process of S202 includes: When the maximum battery cell temperature is greater than the first preset temperature, if the motor temperature is not less than the target temperature, the difference between the maximum battery cell temperature and the minimum battery cell temperature is greater than the second temperature difference, and the difference between the battery minimum temperature and the motor temperature is greater than the third temperature difference, the battery direct cooling circuit and the battery liquid cooling circuit are controlled to operate simultaneously.

[0113] 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 is not large. Therefore, in this embodiment, when the battery DC circuit is working (that is, the maximum battery cell temperature is greater than the first preset temperature and the motor temperature is not less than the target temperature), if it is monitored that the difference between the maximum battery cell temperature and the minimum battery cell temperature is greater than the second temperature difference, it can be determined that the battery cell temperature difference is too large at this time. Simply using the battery direct cooling circuit will continue to increase the temperature difference between the battery cells, but since the motor temperature is not less than the target temperature, it means that the motor liquid cooling system cannot meet the battery cooling requirements at this time. In order to achieve rapid temperature equalization, the on-board controller can determine whether the difference between the current battery minimum temperature and the motor temperature is greater than the third temperature difference. If so, it means that starting the battery liquid cooling circuit will not cause the battery temperature to rise, and the heat of the battery module can be taken away by the rapid circulation of the coolant in the battery liquid cooling circuit, thereby achieving a temperature equalization effect.

[0114] It can be seen from the above embodiments that the battery direct cooling circuit and the battery liquid cooling circuit are controlled to work simultaneously, that is, the battery module can be quickly cooled down by the battery direct cooling circuit, and the battery module can be temperature-equalized 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. Therefore, the refrigerant flow channel can cool down the coolant in the coolant flow channel, thereby accelerating the rapid temperature equalization of the battery module 12 by the battery liquid cooling circuit.

[0115] In a possible implementation manner, the method provided in this embodiment further includes: When the battery direct cooling circuit is working, if it is monitored that the battery module 12 has a thermal runaway fault, the battery direct cooling circuit is controlled to stop working, and the battery liquid cooling circuit is controlled to work.

[0116] 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 battery liquid cooling circuit can be used alone to evenly dissipate the heat of the battery module 12.

[0117] 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.

[0118] 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.

[0119] The present application embodiment provides a control device for a thermal management system of a battery. For the convenience of description, only the parts related to the present application embodiment are shown, which are described in detail as follows: The control device of the battery thermal management system includes: A battery cooling module, used to control the operation of a battery direct cooling circuit and / or a battery liquid cooling circuit according to a relationship between a motor temperature and a temperature of the battery module when the temperature of the battery module of the vehicle is greater than a first preset temperature; A battery heating module, used to control the battery heating circuit to operate when the temperature of the battery module is lower than a second preset temperature; Wherein, the first preset temperature is greater than the second preset temperature.

[0120] In a possible implementation, the temperature of the battery module includes a maximum battery cell temperature; the battery cooling module includes: a battery liquid cooling unit, configured to control the battery liquid cooling circuit to operate when the maximum battery cell temperature is greater than a first preset temperature and the motor temperature is less than a target temperature; the target temperature is a difference between a set temperature and a first value; the first value is a difference between the maximum battery cell temperature and the first preset temperature; The battery direct cooling unit is used to control the battery direct cooling circuit to operate when the highest battery core temperature is greater than a first preset temperature and if the motor temperature is not less than the target temperature.

[0121] 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 includes: If the battery module is in a discharging state, and 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 higher than the first temperature difference, the battery heating circuit is controlled to operate, so as to heat the battery module by waste heat when the motor is operating normally; If the battery module is in a charging state and the lowest battery cell temperature is less than the second temperature value, the battery heating circuit is controlled to operate, and the heat generated by the motor stall is controlled to heat the battery module.

[0122] In a possible implementation, the battery direct cooling unit includes: When the maximum battery cell temperature is greater than the first preset temperature, if the motor temperature is not less than the target temperature, the difference between the maximum battery cell temperature and the minimum battery cell temperature is greater than the second temperature difference, and the difference between the battery minimum temperature and the motor temperature is greater than the third temperature difference, the battery direct cooling circuit and the battery liquid cooling circuit are controlled to operate simultaneously.

[0123] In a possible implementation, the control device of the thermal management system of the battery further includes a thermal runaway management module, which is used to: When the battery direct cooling circuit is working, if it is monitored that the battery module has a thermal runaway fault, the battery direct cooling circuit is controlled to stop working, and the battery liquid cooling circuit is controlled to work.

[0124] 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, thereby achieving the effect of saving energy consumption; when the motor has a heating demand, the battery module is heated by the waste heat or active heat generated by the motor during operation, thereby simplifying the battery heating film and achieving the effect of reducing the cost and weight of the entire vehicle.

[0125] 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 7Step S101 to step S102 shown. It should be understood 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, special processor or a combination thereof. The special 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 typically also installed on the computer platform. The various processes and functions described here may be part of an application, or a part thereof may be executed by an operating system.

[0126] Figure 8 is a schematic diagram of a controller provided in an embodiment of the present application. Figure 8 As shown, the controller 8 of this embodiment includes: a processor 80, a memory 81, and a computer program 82 stored in the memory 81 and executable on the processor 80. When the processor 80 executes the computer program 82, the steps in the control method of the thermal management system of each battery described above are implemented, such as Figure 7 Alternatively, when the processor 80 executes the computer program 82, the functions of the modules / units in the above-mentioned device embodiments are realized.

[0127] Exemplarily, the computer program 82 may be divided into one or more modules / units, which are stored in the memory 81 and executed by the processor 80 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 82 in the controller 8.

[0128] The controller 8 may include, but is not limited to, a processor 80 and a memory 81. Those skilled in the art will appreciate that Figure 8 It is only an example of the controller 8 and does not constitute a limitation of the controller 8. The controller 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.

[0129] The processor 80 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.

[0130] The memory 81 may be an internal storage unit of the controller 8, such as a hard disk or memory of the controller 8. The memory 81 may also be an external storage device of the controller 8, 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 8. Further, the memory 81 may include both an internal storage unit of the controller 8 and an external storage device. The memory 81 is used to store the computer program and other programs and data required by the controller. The memory 81 may also be used to temporarily store data that has been output or is to be output.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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, battery liquid 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 includes a refrigerant flow channel and a coolant flow channel; The battery liquid cooling circuit includes the dual-medium cold plate and the motor liquid cooling system; the motor liquid cooling system includes a radiator; The battery heating circuit includes the dual-medium cold plate and the motor liquid cooling system; the motor liquid cooling system also includes a motor branch; In the battery direct cooling circuit, the refrigerant flow channel is connected to the refrigerant refrigeration system; In the battery liquid cooling circuit, the coolant flow channel is connected to the radiator; In the battery heating circuit, the coolant flow channel is in communication with the motor branch.

2. The thermal management system of a battery according to claim 1, characterized in that: In the battery liquid cooling circuit and the battery heating circuit, the coolant flow channel, the radiator and the motor branch are connected in series; Alternatively, the radiator and the motor branch are connected in series to form a loop, and the coolant flow channel is connected in parallel to the motor branch.

3. The thermal management system of a battery according to claim 2, characterized in that: At least one water pump is provided in the battery liquid cooling circuit and the battery heating circuit.

4. The thermal management system of a battery according to claim 3, characterized in that: The thermal management system further comprises a first three-way valve; the motor branch comprises a motor system and a first water pump; In the battery liquid cooling system, the first end of the first three-way valve is communicated with the first end of the first water pump, the second end of the first water pump is communicated with the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve is communicated with the first end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator and the second end of the coolant flow channel respectively, and the second end of the radiator is communicated with the second end of the first three-way valve; In the battery heating circuit, the first end of the first three-way valve is connected to the first end of the first water pump, the second end of the first water pump is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve is connected to the first end of the coolant flow channel, and the second end of the circulating liquid pipeline of the motor system is connected to the second end of the coolant flow channel.

5. The thermal management system of a battery according to claim 3, characterized in that: The thermal management system further comprises a first three-way valve and a first water pump; the motor branch comprises a motor system; In the battery liquid cooling circuit, the first end of the first water pump is communicated with the first end of the first three-way valve, the third 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 radiator, and the second end of the radiator is communicated with the second end of the first water pump; In the battery heating circuit, the first end of the first water pump 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 circulating liquid pipeline of the motor system, the third end of the first three-way valve is communicated with the first end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator and the second end of the coolant flow channel respectively, and the second end of the radiator is communicated with the second end of the first water pump.

6. The thermal management system of a battery according to claim 3, characterized in that: The thermal management system further comprises a first three-way valve, a first water pump and a second water pump; the motor branch comprises a motor system; In the battery liquid cooling circuit, the first end of the first water pump is communicated with the first end of the first three-way valve, the third end of the first three-way valve is communicated with the first end of the second water pump, the second end of the second water pump 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 radiator, and the second end of the radiator is communicated with the second end of the first water pump; In the battery heating circuit, the second end of the first three-way valve is connected to the first end of the circulating liquid pipeline of the motor system, the third end of the first three-way valve is connected to the first end of the second water pump, the second end of the second water pump is connected to the first end of the coolant flow channel, and the second end of the circulating liquid pipeline of the motor system is connected to the second end of the coolant flow channel.

7. The thermal management system of a battery according to claim 3, characterized in that: The thermal management system further comprises a first three-way valve and a second water pump; the motor branch comprises a motor system and a first water pump; In the battery liquid cooling circuit, the third end of the first three-way valve is communicated with the first end of the second water pump, the second end of the second water pump 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 radiator, and the second end of the radiator is communicated with the second end of the first three-way valve; In the battery heating circuit, the first end of the first three-way valve is connected to the first end of the first water pump, the second end of the first water pump 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 second end of the coolant flow channel, the first end of the coolant flow channel is connected to the second end of the second water pump, and the first end of the second water pump is connected to the third end of the first three-way valve.

8. The thermal management system of a battery according to claim 1, characterized in that: A PTC heater is connected in series between the motor branch and the coolant flow channel.

9. The thermal management system of a battery according to claim 3, characterized in that: The thermal management system further comprises a first water pump and a four-way valve; the motor branch comprises a motor system; In the battery liquid cooling circuit and the battery heating circuit, the first end of the first water pump 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 circulating liquid pipeline of the motor system, the third end of the four-way valve is communicated with the first end of the coolant flow channel, the fourth end of the four-way valve is communicated with the second end of the coolant flow channel, the second end of the circulating liquid pipeline of the motor system is communicated with the first end of the radiator, and the second end of the radiator is communicated with the second end of the first water pump; the first end and the third end of the four-way valve are communicated, and the second end and the fourth end of the four-way valve are communicated.

10. The thermal management system of a battery according to any one of claims 1 to 9, characterized in that: The refrigerant refrigeration system also 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.

11. A control method for a battery thermal management system, characterized in that: A thermal management system for a battery according to any one of claims 1 to 10, 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 and / or the battery liquid cooling circuit to operate according to the relationship between the motor temperature and the temperature of the battery module; 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.

12. The control method of the battery thermal management system according to claim 11, 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 a first preset temperature, the battery direct cooling circuit and / or the battery liquid cooling circuit is controlled to operate according to the relationship between the motor temperature and the temperature of the battery module, including: when the highest battery cell temperature is greater than the first preset temperature, if the motor temperature is less than a target temperature, the battery liquid cooling circuit is controlled to operate; When the highest battery cell temperature is greater than a first preset temperature, if the motor temperature is not less than the target temperature, the battery direct cooling circuit is controlled to operate.

13. The control method of the battery thermal management system according to claim 11, 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, and 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 higher than the first temperature difference, the battery heating circuit is controlled to operate, so as to heat the battery module by waste heat when the motor is operating normally; If the battery module is in a charging state and the lowest battery cell temperature is less than the second temperature value, the battery heating circuit is controlled to operate, and the heat generated by the motor stall is controlled to heat the battery module.

14. The control method of the battery thermal management system according to claim 12, characterized in that: The temperature of the battery module also includes a minimum battery cell temperature; when the maximum battery cell temperature is greater than a first preset temperature, if the motor temperature is not less than a target temperature, controlling the battery direct cooling circuit to operate includes: When the maximum battery cell temperature is greater than the first preset temperature, if the motor temperature is not less than the target temperature, the difference between the maximum battery cell temperature and the minimum battery cell temperature is greater than the second temperature difference, and the difference between the battery minimum temperature and the motor temperature is greater than the third temperature difference, the battery direct cooling circuit and the battery liquid cooling circuit are controlled to operate simultaneously.

15. The control method of the battery thermal management system according to claim 11, characterized in that: The method further comprises: When the battery direct cooling circuit is working, if it is monitored that the battery module has a thermal runaway fault, the battery direct cooling circuit is controlled to stop working, and the battery liquid cooling circuit is controlled to work.

16. A vehicle, characterized in that: include: A thermal management system for a battery as claimed in any one of claims 1 to 10.

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