Battery thermal management system and vehicle

Abstract

The invention provides a battery thermal management system and a vehicle. The system comprises a first cooling loop, a second cooling loop, a third cooling loop, a power battery and a four-way valve, a battery cooling liquid loop of the power battery is in heat exchange connection with the first cooling loop through a first heat exchange structure, the battery cooling liquid loop is in heat exchange connection with the second cooling loop through a second heat exchange structure, and the battery cooling liquid loop is connected with the third cooling loop through a four-way valve; when the battery needs low refrigeration, cooling is conducted through the third cooling loop, when the third cooling loop cannot meet the refrigeration requirement, cooling is conducted through the independent cooling loop, at the moment, a cab air conditioner operates independently, battery cooling operates independently, and the air conditioner using experience of a user is not affected. Only when the battery has a high refrigeration requirement, air-conditioning refrigeration and battery cooling of the cab are reused for collaborative operation for cooling.

Description

Technical Field

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

[0002] With the increasing popularity of electric vehicles, especially in super-fast charging scenarios, battery packs generate a lot of heat. A good battery cooling system can not only extend the battery life, but also ensure battery safety and stability.

[0003] Currently, most electric vehicle battery cooling solutions rely primarily on water cooling systems, which are categorized into two main approaches: standalone plate heat exchangers and those integrated with air conditioning systems. To meet the battery cooling needs under high-rate charging, standalone plate heat exchangers often improve cooling efficiency by increasing the cooling capacity or adding more units. However, this results in an increase in system size and weight, and makes unit placement more difficult, impacting the vehicle's spatial layout and overall design. Cooling systems integrated with air conditioning have limited cooling capacity. When battery cooling needs increase, the system may forcibly increase cooling capacity to meet the battery cooling needs. At this time, if the user is using the air conditioner, the temperature inside the vehicle will become uncomfortable, affecting the comfort of the occupants.

[0004] Therefore, how to design a cooling system that can meet the changing cooling needs of batteries without affecting user comfort is a problem that needs to be solved. Summary of the Invention

[0005] The present application provides a battery thermal management system and a vehicle, which are used to design a battery thermal management system that decouples air conditioning refrigeration and battery refrigeration when the battery has general cooling requirements; and when the battery has high cooling requirements, the cooling requirements are met with the help of the air conditioning refrigeration system's capabilities.

[0006] In a first aspect, a battery thermal management system is provided, comprising: a first cooling circuit, a second cooling circuit, a third cooling circuit, a power battery, and a four-way valve; wherein a battery coolant circuit of the power battery is heat-exchanged with the first cooling circuit via a first heat exchange structure, the battery coolant circuit is heat-exchanged with the second cooling circuit via a second heat exchange structure, and the battery coolant circuit is connected to the third cooling circuit via the four-way valve;

[0007] When the water inlet temperature of the power battery is lower than a preset first temperature threshold, the four-way valve is in a first open state, and the liquid in the battery coolant circuit flows into the third cooling circuit for cooling;

[0008] When the water inlet temperature is greater than the first temperature threshold and less than the second temperature threshold, the coolant in the first cooling circuit flows, causing the first heat exchange structure to cool the battery coolant circuit;

[0009] When the water inlet temperature is greater than the second temperature threshold, the coolant in the first cooling circuit flows, and the coolant in the second cooling circuit of the air conditioning system flows, so that the first heat exchange structure and the second heat exchange structure cool the battery coolant circuit respectively.

[0010] Optionally, the first heat exchange structure is a first plate heat exchanger, and the first cooling circuit includes the first plate heat exchanger, a first compressor and a first condenser;

[0011] When the water inlet temperature is greater than the first temperature threshold, the first compressor operates to allow the coolant condensed by the first condenser to flow through the first plate heat exchanger.

[0012] Optionally, the second heat exchange structure is a second plate heat exchanger, and the second cooling circuit includes the second plate heat exchanger, an air conditioner evaporator, a second compressor, a second condenser, and a first electronic expansion valve; wherein the first electronic expansion valve is arranged at the water inlet of the second plate heat exchanger, and the second plate heat exchanger and the air conditioner evaporator are connected in parallel;

[0013] When the water inlet temperature is greater than the second temperature threshold, the second compressor operates, and the first electronic expansion valve is in an open state, so that the coolant condensed by the second condenser flows through the second plate heat exchanger.

[0014] Optionally, when the water inlet temperature is less than or equal to the second temperature threshold, and the second compressor is working, and the first electronic expansion valve is in a closed state, the second condenser condenses the coolant to flow through the air-conditioning evaporator.

[0015] Optionally, the second cooling circuit further includes a second electronic expansion valve, which is arranged at the water inlet of the air-conditioning evaporator, and the opening of the second electronic expansion valve is used to control the flow of coolant flowing through the air-conditioning evaporator.

[0016] Optionally, when the water inlet temperature is greater than or equal to the first temperature threshold, the four-way valve is in a second open state, and the liquid in the battery coolant circuit is isolated from the liquid in the third cooling circuit.

[0017] Optionally, the third cooling circuit includes a radiator, and the coolant dissipated by the radiator flows through the four-way valve.

[0018] Optionally, the battery thermal management system further includes a domain controller, and the domain controller is connected to the first electronic expansion valve and the second electronic expansion valve respectively;

[0019] When the water inlet temperature is greater than the second temperature threshold, the domain controller is used to control the opening of the first electronic expansion valve and the opening of the second electronic expansion valve according to the water inlet temperature.

[0020] Optionally, the domain controller is further connected to the first compressor and the second compressor;

[0021] When the water inlet temperature is greater than the first temperature threshold, the domain controller controls the first compressor to start;

[0022] When the water inlet temperature is greater than the second temperature threshold, the domain controller controls the second compressor to start.

[0023] In a second aspect, the present application also provides a vehicle comprising a vehicle body and a battery thermal management system as described in any one of the first aspects.

[0024] The present application provides a battery thermal management system and a vehicle, the system comprising: a first cooling circuit, a second cooling circuit, a third cooling circuit, a power battery and a four-way valve; wherein, the battery coolant circuit of the power battery is heat-exchanged with the first cooling circuit via a first heat exchange structure, the battery coolant circuit is heat-exchanged with the second cooling circuit via a second heat exchange structure, and the battery coolant circuit is connected with the third cooling circuit via the four-way valve; when the water inlet temperature of the power battery is lower than a preset first temperature threshold, the four-way valve is in a first open-circuit state, and the liquid in the battery coolant circuit flows into the third cooling circuit for cooling; when the water inlet temperature is higher than the first temperature threshold and lower than the second temperature threshold, the coolant in the first cooling circuit flows, causing the first heat exchange structure to cool the battery coolant circuit; when the water inlet temperature is higher than the second temperature threshold, the coolant in the first cooling circuit flows, and the coolant in the second cooling circuit of the air-conditioning system flows, causing the first heat exchange structure and the second heat exchange structure to cool the battery coolant circuit respectively. When the battery's cooling needs are low, the radiator is used for cooling. If the radiator alone cannot meet the cooling needs, a separate cooling circuit is used for cooling. In this case, the cab air conditioning and battery cooling operate independently, without affecting the user's air conditioning experience. When the battery's cooling needs are high, the cab air conditioning and battery cooling work together to cool the cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] Figure 1A schematic diagram of the structure of a battery thermal management system provided in this application Figure 1 ;

[0027] Figure 2 A schematic diagram of the structure of a battery thermal management system provided in this application Figure 2 ;

[0028] Figure 3 Provide a schematic diagram of the structure of the electric heat management system for this application Figure 3 ;

[0029] Figure 4 A flow chart of a battery thermal management control method provided in this application;

[0030] Figure 5 A schematic diagram of the structure of a battery thermal management control device provided in this application;

[0031] Figure 6 A schematic diagram of the structure of the electronic device provided for this application;

[0032] Figure 7 Schematic diagram of the input and output of the domain controller provided for this application.

[0033] Description of reference numerals:

[0034] 1-1 First compressor, 1-2 Exhaust temperature sensor, 1-3 First condenser, 1-4 High pressure sensor, 1-5 First plate heat exchanger, 1-6 Low temperature PT sensor; 2-1 Second compressor, 2-2 Exhaust temperature sensor, 2-3 Second condenser, 2-4 High pressure sensor, 2-5 Second electronic expansion valve, 2-6 Air conditioner evaporator, 2-7 Low temperature PT sensor, 2-8 First electronic expansion valve, 2-9 Second plate heat exchanger, 2-10 Low temperature PT sensor, 2-11 Gas-liquid separator, 2 -12 Air conditioning heater core, 2-13 Air conditioning heating water pump, 2-14 Heater PTC, 2-15 Heater kettle; 3-1 Low-temperature radiator, 3-2 Three-way valve, 3-3 Water temperature sensor, 3-4 Four-way valve, 3-5 Electronically controlled circulating water pump, 3-6 Motor-controlled circulating water pump, 3-7 Electronic control, 3-8 Motor, 3-9 Water temperature sensor, 3-10 One-way valve, 3-11 Kettle, 4-1 First battery water pump, 4-2 Water temperature sensor, 4-3 Power battery, 4-4 Water temperature sensor, 4-5 Second battery water pump.

[0035] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0037] Currently, battery cooling solutions for electric heavy-duty trucks primarily rely on water cooling, using either standalone plate heat exchangers or integrated with air conditioning systems. With the advent of high-rate charging capabilities like super-fast charging and multi-gun charging, the demand for battery cooling has increased dramatically. Standalone plate heat exchangers can only meet this demand by increasing cooling capacity or adding more units, leading to problems like large unit size, heavy weight, and difficulty in layout. Cooling systems integrated with air conditioning, however, have limited cooling capacity and cannot simultaneously meet both the high-rate battery cooling needs and the air conditioning cooling needs. Ultimately, passenger comfort must be sacrificed in favor of a forced increase in cooling capacity. Because the system's minimum cooling capacity is excessively large, the compressor frequently starts and stops under low air conditioning cooling demand conditions, severely impacting compressor life.

[0038] In view of this, the present application provides a battery thermal management system, which has a dual-plate heat exchanger. One of the separate plate heat exchangers cools the battery cooling circuit, and the other plate heat exchanger can use the coolant in the air-conditioning cooling circuit to cool the battery cooling circuit. The thermal management system also includes a radiator corresponding to the motor, which can be used to cool the battery when the cooling demand is low. Through this arrangement, when the battery is discharging or charging at a low rate, the battery cooling and the air-conditioning are independent of each other and do not interfere with each other. When charging at a high rate, in addition to independent battery cooling, the air-conditioning system is used to assist in cooling the battery. Thus, under the premise of ensuring the battery cooling demand and the air-conditioning cooling effect, the disadvantages of simply increasing the cooling capacity of the independent plate heat exchanger or the integrated air-conditioning system to meet higher battery cooling needs are solved.

[0039] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0040] Figure 1 A schematic diagram of the structure of a battery thermal management system provided in this application Figure 1 ,like Figure 1As shown, the battery thermal management system includes: a first cooling circuit, a second cooling circuit, a third cooling circuit, a power battery, and a four-way valve; wherein the battery coolant circuit of the power battery is heat-exchanged with the first cooling circuit via a first heat exchange structure, the battery coolant circuit is heat-exchanged with the second cooling circuit via a second heat exchange structure, and the battery coolant circuit is connected to the third cooling circuit via a four-way valve;

[0041] Reference Figure 1 In the figure, the black trace represents the battery coolant circuit, the red trace represents the primary cooling circuit for battery cooling, the blue trace represents the secondary cooling circuit for air conditioning, and the green trace represents the tertiary cooling circuit for the radiator.

[0042] The first heat exchange structure can be a plate heat exchanger or other type of heat exchanger. The second heat exchange structure can be a plate heat exchanger or other type of heat exchanger. The battery coolant circuit is not directly connected to the first cooling circuit or the second cooling circuit, and heat is exchanged with each other only in the heat exchange structure (i.e., heat exchange connection). When the coolant in the cooling circuit flows in the heat exchange structure, it can remove the temperature of the liquid in the battery coolant circuit.

[0043] The four-way valve can be used in different open positions to control the direct connection between the third cooling circuit and the battery coolant circuit. When the four-way valve is in the first open position, as shown by the solid line in the figure, the battery coolant circuit and the third cooling circuit are connected. When the four-way valve is in the second open position, as shown by the dashed line in the figure, the battery coolant circuit and the third cooling circuit are isolated from each other.

[0044] When the water inlet temperature of the power battery is below a preset first temperature threshold, the four-way valve is in the first open state, allowing the liquid in the battery coolant circuit to flow into the third cooling circuit for cooling. The third cooling circuit contains a vehicle-mounted cooling device, such as a motor radiator, which can cool the liquid in the circuit.

[0045] When the water inlet temperature is greater than a first temperature threshold and less than a second temperature threshold, coolant in the first cooling circuit flows, allowing the first heat exchange structure to cool the battery coolant circuit. The four-way valve can be in either the first or second open state. The first cooling circuit is specifically designed for battery cooling.

[0046] When the water inlet temperature exceeds a second temperature threshold, coolant flows through the first cooling circuit and the second cooling circuit, allowing the first and second heat exchange structures to cool the battery coolant circuits, respectively. The second cooling circuit is a cooling circuit within the vehicle with its own cooling capabilities, such as the air conditioner coolant circuit. Alternatively, when the temperature rises, the air conditioner's second cooling circuit can be used to cool the battery.

[0047] This embodiment provides a battery thermal management system. When the battery cooling demand is low, cooling is performed solely through the third cooling circuit. When the battery has normal cooling requirements, cooling is performed through the separately configured first cooling circuit. This configuration isolates the battery cooling system from the air conditioning cooling system, allowing battery cooling to be controlled independently without impacting the user's air conditioning experience. When the battery temperature is high and cooling demand is high, cooling is performed using the vehicle's air conditioning's second cooling circuit, in addition to the first cooling circuit. This solution minimizes the impact on the user's air conditioning experience.

[0048] The structure of the battery thermal management system is introduced in detail below.

[0049] Figure 2 A schematic diagram of the structure of a battery thermal management system provided in this application Figure 2 ,like Figure 2 As shown in the figure, the battery thermal management system includes: a power battery, a battery coolant circuit, and a domain controller. The black trace in the figure represents the battery coolant circuit, the red trace represents the primary cooling circuit set up solely for battery cooling, the blue trace represents the secondary cooling circuit for air conditioning, and the green trace represents the tertiary cooling circuit that passes through the radiator.

[0050] The battery coolant circuit is provided with a first plate heat exchanger, a second plate heat exchanger, a temperature sensor and a four-way valve;

[0051] The first cooling circuit of the first plate heat exchanger is provided with a first compressor and a first condenser; the first plate heat exchanger is a separate cooling circuit, and when the first compressor is working, the first plate heat exchanger cools the liquid in the battery coolant circuit.

[0052] The second cooling circuit of the second plate heat exchanger is equipped with an air conditioner evaporator, a temperature and pressure sensor, a second compressor, and a first electronic expansion valve. The first electronic expansion valve controls the flow of liquid from the second cooling circuit into the second plate heat exchanger. When the first electronic expansion valve opens, the coolant in the second cooling circuit enters the second plate heat exchanger, thereby cooling the liquid in the battery coolant circuit. When the first electronic expansion valve closes, the second cooling circuit only cools the air conditioner. The temperature and pressure sensor monitors the temperature and pressure of the liquid exiting the air conditioner evaporator.

[0053] The battery coolant circuit is connected to the radiator circuit through a four-way valve;

[0054] The domain controller is connected to the four-way valve, the first electronic expansion valve, the temperature sensor, the first compressor, and the second compressor. The domain controller controls the operating status of the four-way valve, the opening of the first electronic expansion valve, and the operating status of the first and second compressors. The domain controller is not shown in the figure.

[0055] The four-way valve can be set to two states, such as Figure 2 As shown, when the four-way valve is in the first open state, that is, the solid line connection mode in the four-way valve. The first input end of the four-way valve is the battery coolant circuit, and the first output end is the radiator circuit; the second input end of the four-way valve is the radiator circuit, and the second output end is the battery coolant circuit. In this way, the liquid in the battery coolant circuit can flow through the radiator in the radiator circuit, and the radiator cools the liquid in the circuit. After cooling, it flows back to the battery coolant circuit through the four-way valve, thereby cooling the battery. In this connection mode, when the first plate heat exchanger and the second plate heat exchanger are working, they can still play a cooling role on the battery coolant circuit. When both the first plate heat exchanger and the second plate heat exchanger are not working, the battery coolant circuit can be cooled only by the radiator.

[0056] When the four-way valve is in the second open state, i.e., the dotted line connection within the four-way valve, the first input of the four-way valve is the battery coolant circuit, and the first output of the four-way valve is the battery coolant circuit. The second input of the four-way valve is the radiator circuit, and the second output of the four-way valve is the radiator circuit. This prevents the liquid in the battery coolant circuit from flowing through the radiator circuit. The coolant circuit is cooled by the first and / or second plate heat exchangers.

[0057] This embodiment provides a battery thermal management system, comprising: a power battery, a battery coolant circuit, and a domain controller. The battery coolant circuit is equipped with a first plate heat exchanger, a second plate heat exchanger, a temperature sensor, and a four-way valve. The first plate heat exchanger and the second plate heat exchanger are each used to cool the liquid in the battery coolant circuit. The first cooling circuit of the first plate heat exchanger is equipped with a first compressor and a first condenser, while the second cooling circuit of the second plate heat exchanger is equipped with an air conditioning evaporator, a second compressor, and a first electronic expansion valve. The first electronic expansion valve is used to control the flow of coolant from the second cooling circuit into the second plate heat exchanger. The battery coolant circuit is connected to the radiator circuit via a four-way valve. The domain controller is respectively connected to the four-way valve, the first electronic expansion valve, the temperature sensor, the first compressor, and the second compressor. The three refrigeration systems dynamically switch refrigerant lines through the electronic expansion valve and the four-way valve, enabling independent operation of the cab air conditioning, independent operation of the battery cooling, or simultaneous operation of cab cooling and battery cooling.

[0058] The following is an introduction to the battery thermal management system using a specific example.

[0059] Figure 3 Provide a schematic diagram of the structure of the electric heat management system for this application Figure 3 ,like Figure 3As shown, the configuration of the battery thermal management system is described in detail, wherein the first compressor 1-1, the exhaust temperature sensor 1-2, the first condenser 1-3, the high-pressure sensor 1-4, the first plate heat exchanger (Chiller) 1-5, and the low-temperature PT sensor 1-6; the second compressor 2-1, the exhaust temperature sensor 2-2, the second condenser 2-3, the high-pressure sensor 2-4, the second electronic expansion valve (EXV valve) 2-5, the air conditioning evaporator 2-6, the low-temperature PT sensor 2-7, the first electronic expansion valve (EXV valve) 2-8, the second plate heat exchanger (Chiller) 2 -9, low-temperature PT sensor 2-10, gas-liquid separator 2-11, air conditioning heater core 2-12, air conditioning heating water pump 2-13, heater PTC 2-14, heater kettle 2-15; low-temperature radiator 3-1, three-way valve 3-2, water temperature sensor 3-3, four-way valve 3-4, electronically controlled circulating water pump 3-5, motor circulating water pump 3-6, electronic control 3-7, motor 3-8, water temperature sensor 3-9, one-way valve 3-10, kettle 3-11; first battery water pump 4-1, water temperature sensor 4-2, power battery 4-3, water temperature sensor 4-4, second battery water pump 4-5.

[0060] The low-temperature radiator dissipates heat for the coolant of the motor, electronic control and other equipment. When the four-way valve 3-4 is in a solid line connection, the battery coolant loop flows into the low-temperature radiator 3-1 and then flows into the battery coolant loop through the four-way valve.

[0061] When the first compressor 1 - 1 is started, the first cooling circuit works, and the first plate heat exchanger 1 - 5 can cool the battery cooling circuit.

[0062] When the first compressor 2 - 1 is started, the second cooling circuit is in operation, and the second plate heat exchanger 2 - 9 can cool the battery cooling circuit.

[0063] The second electronic expansion valve 2-5 is used to regulate the flow of coolant into the air conditioner evaporator 2-6. The coolant flowing into the air conditioner evaporator absorbs heat from the air inside the vehicle, thereby lowering the temperature inside the vehicle.

[0064] The condenser removes heat through convection with air or a liquid medium, helping the refrigerant transform from a gas to a liquid. The low-temperature PT sensor monitors the coolant's temperature and pressure. The water pump circulates the coolant within the circuit. The kettle stores the coolant, while the check valve ensures proper flow and prevents backflow.

[0065] The following describes how the specific control method regulates and cools the battery.

[0066] Figure 4 A flow chart of a battery thermal management control method provided in this application is shown as follows: Figure 4As shown, with the domain controller of the battery thermal management system as the execution body, the method includes the following steps:

[0067] S101. Obtain the battery water inlet temperature.

[0068] In this step, the battery water inlet temperature collected by the water temperature sensor 4-2 is obtained.

[0069] S102 : Control the open state of the four-way valve, the opening degree of the first electronic expansion valve, the operating parameters of the first compressor, and the operating parameters of the second compressor according to the battery inlet water temperature.

[0070] In this step, the control strategy to be adopted is determined based on the battery water inlet temperature, and then the specific control strategy for each component is determined. The specific steps include the following:

[0071] S1021. Determine whether the battery water inlet temperature is greater than a preset first temperature threshold.

[0072] The first temperature threshold may be set to 20°C, 22°C, or 25°C.

[0073] If the battery inlet water temperature is lower than the first temperature threshold, it indicates that the battery cooling demand is relatively low, and step S1022 is executed.

[0074] If the battery water inlet temperature is greater than or equal to the first temperature threshold, step S1023 is executed.

[0075] S1022: Control the four-way valve to be in a first open state.

[0076] When the four-way valve is in the first open state, the liquid in the battery coolant circuit flows into the radiator circuit, cooling the liquid in the battery coolant circuit through the radiator. In addition, the domain controller controls the first compressor to be in an inactive state, meaning that the first refrigeration circuit does not need to operate. The battery cooling circuit also does not require the second refrigeration circuit to cool it. However, the state of the second refrigeration circuit's second compressor is related to the air conditioning. In this scenario, there is no need to control the second compressor's state; only the first electronic expansion valve needs to be closed.

[0077] Through the first control strategy mentioned above, energy consumption can be saved.

[0078] S1023. Control the four-way valve to be in the second open state, start the first compressor, and adjust the operating parameters of the first compressor.

[0079] When the four-way valve is in the second, open position, the battery coolant circuit is isolated from the radiator circuit, at least the first compressor is activated, and the first cooling circuit operates, cooling the liquid in the battery coolant circuit via the first plate heat exchanger. The domain controller adjusts the speed, power, load, and other parameters of the first compressor based on the battery temperature using a proportional-integral-derivative temperature control strategy.

[0080] The second compressor and the first electronic expansion valve can also be controlled to open according to temperature requirements, and the second plate heat exchanger can be used for cooling.

[0081] The specific control method needs to be limited according to the battery temperature.

[0082] S1024: Obtain battery temperature.

[0083] S1025: Determine whether the battery temperature is greater than a preset second temperature threshold.

[0084] The second temperature threshold is greater than the first temperature threshold and can be set to 50°C, 55°C, or 60°C.

[0085] If the battery temperature is lower than the second temperature threshold, it indicates that the battery temperature is high but not above the threshold temperature, and cooling requirements can be met solely through its own cooling circuit. At this point, the control logic of step S1023 is executed, turning on the first compressor. The first plate heat exchanger begins operating, and its operating parameters, such as power and speed, are adjusted based on the battery temperature using a proportional-integral-differential control method. In this scenario, the opening of the first electronic expansion valve is set to 0, and the air conditioning and battery cooling systems are independent of each other.

[0086] If the battery temperature is greater than or equal to the second temperature threshold, it indicates that the temperature of the first refrigeration circuit is no longer sufficient for cooling, and the air conditioner's second cooling circuit is needed to improve the cooling effect. However, whether the second cooling circuit is operating is affected by whether the user turns on the air conditioner. Therefore, step S1026 is executed to obtain the operating status of the second compressor.

[0087] S1026. Obtain the working status of the second compressor.

[0088] S1027: Determine whether the second compressor is turned on.

[0089] If the working state of the second compressor is not turned on, it indicates that the user is not using the air conditioner at the moment, and step S1028 is executed.

[0090] If the working state of the second compressor is turned on, it means that the user has turned on the air conditioner, and step S1029 is executed.

[0091] S1028: Control to start the second compressor and open the first electronic expansion valve.

[0092] After the second compressor and the first electronic expansion valve are turned on, the second plate heat exchanger can operate to cool the liquid in the battery cooling circuit. At this time, the second electronic expansion valve can be closed.

[0093] In a specific implementation, the operating parameters of the second compressor, the operating parameters of the first compressor, and the target opening of the first electronic expansion valve are determined according to the battery temperature through a proportional-integral-differential control method, and the target opening is greater than 0.

[0094] In a specific implementation, the operating parameters of the second compressor (such as speed, power, etc.) and the target opening of the first electronic expansion valve in this scenario are pre-set. When the control strategy is triggered, the pre-set parameters are executed.

[0095] S1029. Obtain the temperature and pressure of the water flowing out of the air conditioner evaporator.

[0096] At this time, the air conditioner has been turned on and is being used. In order to ensure the cooling effect of the air conditioner and the user experience, the water temperature and pressure flowing out of the air conditioner evaporator are obtained to ensure that they are within the normal range.

[0097] S1030: Regulate the operating parameters of the second compressor, the opening of the first electronic expansion valve, and the opening of the second electronic expansion valve according to the battery temperature, water temperature, and pressure.

[0098] In this scenario, measures are needed to effectively cool the battery. The first compressor operates at full load. To further improve the cooling effect, the first electronic expansion valve is opened and the speed of the second compressor is increased. To avoid affecting the cooling effect of the air conditioner, the opening of the second electronic expansion valve is adjusted to keep the water temperature flowing out of the air conditioner evaporator within the preset water temperature range and the water pressure flowing out of the air conditioner evaporator within the preset pressure range, which will not affect the user's air conditioning experience. Because the first electronic expansion valve is open, some coolant flows into the second plate heat exchanger, and the coolant flowing into the air conditioner evaporator becomes less. Therefore, the opening of the second electronic expansion valve can be appropriately increased to ensure that more coolant can enter the evaporator, thereby enhancing the cooling effect of the air conditioner. The opening of the first and second electronic expansion valves can be adjusted in real time by the domain controller.

[0099] If the water temperature is too high or the pressure is too low, the domain controller can take one or more of the following measures: increase the speed of the second compressor, increase the opening of the second electronic expansion valve, or reduce the opening of the first electronic expansion valve.

[0100] If the water temperature is too low or the pressure is too high, the domain controller can take one or more of the following measures: reduce the speed of the second compressor, reduce the opening of the second electronic expansion valve, or increase the opening of the first electronic expansion valve.

[0101] Figure 5 This is a schematic diagram of the structure of a battery thermal management control device provided in this application, such as Figure 5 As shown, the battery thermal management control device 40 includes:

[0102] The acquisition module 401 is used to obtain the battery inlet water temperature.

[0103] The control module 402 is used to control the open state of the four-way valve, the opening degree of the first electronic expansion valve, the operating parameters of the first compressor, and the operating parameters of the second compressor according to the battery water inlet temperature.

[0104] Optionally, the control module 402 is specifically configured to:

[0105] If the battery inlet water temperature is lower than a preset first temperature threshold, the four-way valve is controlled to be in a first open state, and the first compressor is controlled to be in a non-operating state; wherein, the first open state is used to allow the liquid in the battery coolant circuit to flow into the radiator circuit, and cool the liquid in the battery coolant circuit through the radiator.

[0106] If the battery inlet water temperature is greater than or equal to the first temperature threshold, the four-way valve is controlled to be in a second open state, and the first compressor and the first electronic expansion valve are turned on; wherein, the second open state is used to isolate the battery coolant circuit from the radiator circuit, and cool the liquid in the battery coolant circuit through the first plate heat exchanger and / or the second plate heat exchanger.

[0107] Optionally, the acquisition module 401 is further configured to acquire the battery temperature. Accordingly, the control module 402 is further configured to:

[0108] Determining whether the battery temperature is greater than a preset second temperature threshold;

[0109] If the battery temperature is lower than the second temperature threshold, turning on the first compressor, setting the opening of the first electronic expansion valve to 0, and determining the operating parameters of the first compressor according to the battery temperature;

[0110] If the battery temperature is greater than or equal to the second temperature threshold, obtaining the operating state of the second compressor;

[0111] If the working state of the second compressor is not turned on, the second compressor is turned on, and the working parameters of the second compressor, the working parameters of the first compressor and the opening of the first electronic expansion valve are regulated according to the battery temperature.

[0112] Optionally, the acquisition module 401 is further configured to: if the working state of the second compressor is turned on, obtain the water temperature and pressure flowing out of the air conditioner evaporator. Correspondingly, the control module 402 is further configured to:

[0113] The operating parameters of the second compressor, the opening degree of the first electronic expansion valve, and the opening degree of the second electronic expansion valve are regulated according to the battery temperature, the water temperature, and the pressure.

[0114] The battery thermal management control device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effects are similar and will not be described in detail in this embodiment.

[0115] Figure 6 This is a schematic diagram of the structure of the electronic device provided in this application, which may be a domain controller. Figure 6 As shown, the electronic device 50 provided in this embodiment includes: at least one processor 501 and a memory 502. Optionally, the device 50 further includes a communication component 503. The processor 501, the memory 502 and the communication component 503 are connected via a bus 504.

[0116] In a specific implementation process, at least one processor 501 executes the computer-executable instructions stored in the memory 502, so that the at least one processor 501 performs the above method.

[0117] The specific implementation process of the processor 501 can be found in the above method embodiment. Its implementation principle and technical effects are similar and will not be repeated here in this embodiment.

[0118] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the present invention may be directly executed by a hardware processor or by a combination of hardware and software modules in the processor.

[0119] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (NVM), such as at least one disk memory.

[0120] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Buses can be classified into address buses, data buses, and control buses. For ease of illustration, the buses in the drawings of this application are not limited to just one bus or just one type of bus.

[0121] Figure 7 The input and output diagram of the domain controller provided for this application is as follows: Figure 7 As shown in the figure, the blue line represents CAN communication, the yellow line represents LIN communication, and the black line represents hard-wired communication. The thermal management domain controller (XCU) collects data from various sensors to control the water pump, compressor, four-way valve, three-way valve, radiator, etc., to implement the method in the above embodiment.

[0122] The present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0123] The present application also provides a vehicle, including a vehicle body and a battery thermal management system, wherein the domain controller in the battery thermal management system is used to execute the method as described in any one of the above method embodiments.

[0124] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0125] The above-mentioned readable storage medium can be implemented by any type of volatile or non-volatile memory device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0126] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist in a device as discrete components.

[0127] The division of units is merely a logical functional division; actual implementations may employ alternative divisions, such as combining or integrating multiple units or components into another system, or omitting or disabling certain features. Furthermore, any direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units, either through an interface, electrical, mechanical, or other means.

[0128] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0129] In addition, each functional unit in each embodiment of the present invention 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.

[0130] If the function 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 technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program code.

[0131] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0132] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A battery thermal management system, characterized in that: The battery thermal management system includes: a first cooling circuit, a second cooling circuit, a third cooling circuit, a power battery, and a four-way valve; wherein the battery coolant circuit of the power battery is heat-exchanged with the first cooling circuit via a first heat exchange structure, the battery coolant circuit is heat-exchanged with the second cooling circuit via a second heat exchange structure, and the battery coolant circuit is connected to the third cooling circuit via the four-way valve; When the water inlet temperature of the power battery is lower than a preset first temperature threshold, the four-way valve is in a first open state, and the liquid in the battery coolant circuit flows into the third cooling circuit for cooling; When the water inlet temperature is greater than the first temperature threshold and less than the second temperature threshold, the coolant in the first cooling circuit flows, causing the first heat exchange structure to cool the battery coolant circuit; When the water inlet temperature is greater than the second temperature threshold, the coolant in the first cooling circuit flows, and the coolant in the second cooling circuit of the air conditioning system flows, so that the first heat exchange structure and the second heat exchange structure cool the battery coolant circuit respectively.

2. The battery thermal management system according to claim 1, characterized in that: The first heat exchange structure is a first plate heat exchanger, and the first cooling circuit includes the first plate heat exchanger, a first compressor and a first condenser; When the water inlet temperature is greater than the first temperature threshold, the first compressor operates to allow the coolant condensed by the first condenser to flow through the first plate heat exchanger.

3. The battery thermal management system according to claim 2, characterized in that: The second heat exchange structure is a second plate heat exchanger, and the second cooling circuit includes the second plate heat exchanger, an air conditioner evaporator, a second compressor, a second condenser, and a first electronic expansion valve; wherein the first electronic expansion valve is arranged at the water inlet of the second plate heat exchanger, and the second plate heat exchanger and the air conditioner evaporator are connected in parallel; When the water inlet temperature is greater than the second temperature threshold, the second compressor operates, and the first electronic expansion valve is in an open state, so that the coolant condensed by the second condenser flows through the second plate heat exchanger.

4. The battery thermal management system according to claim 3, characterized in that: When the water inlet temperature is less than or equal to the second temperature threshold, and the second compressor is operating, and the first electronic expansion valve is in a closed state, the second condenser condenses the coolant and flows through the air conditioner evaporator.

5. The battery thermal management system according to claim 4, characterized in that: The second cooling circuit also includes a second electronic expansion valve, which is arranged at the water inlet of the air-conditioning evaporator. The opening of the second electronic expansion valve is used to control the flow of coolant flowing through the air-conditioning evaporator.

6. The battery thermal management system according to any one of claims 1 to 5, characterized in that: When the water inlet temperature is greater than or equal to the first temperature threshold, the four-way valve is in a second open state, and the liquid in the battery coolant circuit is isolated from the liquid in the third cooling circuit.

7. The battery thermal management system according to any one of claims 1 to 5, characterized in that: The third cooling circuit includes a radiator, and the coolant dissipated by the radiator flows through the four-way valve.

8. The battery thermal management system according to any one of claim 5, characterized in that: The battery thermal management system further includes a domain controller, which is connected to the first electronic expansion valve and the second electronic expansion valve respectively; When the water inlet temperature is greater than the second temperature threshold, the domain controller is used to control the opening of the first electronic expansion valve and the opening of the second electronic expansion valve according to the water inlet temperature.

9. The battery thermal management system according to claim 8, characterized in that: The domain controller is also connected to the first compressor and the second compressor; When the water inlet temperature is greater than the first temperature threshold, the domain controller controls the first compressor to start; When the water inlet temperature is greater than the second temperature threshold, the domain controller controls the second compressor to start.

10. A vehicle, characterized in that: The vehicle comprises a vehicle body and a battery thermal management system according to any one of claims 1 to 9.

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