Thermal management system of vehicle battery and control method

Abstract

The invention provides a thermal management system of a vehicle battery and a control method. The thermal management system comprises a heating loop, a cooling loop, a motor loop, a four-way valve and a battery pack, and a heat management controller in the vehicle responds to the condition that the temperature of the water outlet of the battery pack reaches a preset condition, and controls the heating loop, the cooling loop and the motor loop to be selectively communicated through the corresponding water inlet and outlet of the four-way valve, so that the temperature of the water outlet of the battery pack is within a calibration range. The four-way valve is additionally arranged between the motor loop and the heating loop, so that the motor loop can be communicated under specific conditions, and better cooling is achieved.

Description

Technical Field

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

[0002] In new energy vehicles, batteries play a vital role in the entire vehicle system. When the battery is continuously charged and discharged, its temperature will rise sharply, which will cause damage to the battery; in an extreme temperature environment below zero, the battery will not work properly due to internal freezing at low temperature. Therefore, the thermal management system of the battery cannot be ignored. The thermal management system ensures that the battery and its related components can operate stably under actual driving conditions by controlling equipment such as compressors, condensers, and heat pumps, and will not fluctuate greatly due to extreme external temperatures. The existing cooling methods can be roughly divided into three types. The first is air cooling; the second is water cooling, which has a better cooling effect than air cooling; the third is liquid cooling, which has a strong heat dissipation effect and is suitable for high temperature environments.

[0003] However, air cooling is only for small-capacity batteries and uses fans to cool down batteries when the ambient temperature is suitable; water cooling is easily affected by the external ambient temperature and is not suitable for high-temperature environments; the cooling medium in liquid cooling will produce certain losses during the exchange process, and its exchange structure is relatively complex and prone to failure. Summary of the invention

[0004] In view of this, the purpose of the embodiments of the present application is to provide a thermal management system and control method for a vehicle battery. The present application realizes heat exchange by adding a heat exchanger between the cooling circuit and the heating circuit, thereby quickly reducing the temperature of the battery pack; adds a four-way valve between the motor circuit and the heating circuit, so that the motor circuit can be connected under specific circumstances, thereby realizing energy exchange; and sets a waste heat recovery pipe in the motor circuit to achieve the purpose of saving energy.

[0005] This application mainly includes the following aspects:

[0006] In a first aspect, an embodiment of the present application provides a thermal management system for a vehicle battery, the thermal management system comprising: a heating circuit, a cooling circuit, a motor circuit, a four-way valve, and a battery pack;

[0007] In response to the water outlet temperature of the battery pack reaching a preset condition, the thermal management controller in the vehicle controls the heating circuit, the cooling circuit and the motor circuit to be selectively connected through the corresponding water inlets and outlets of the four-way valve so that the water outlet temperature of the battery pack is within a calibrated range.

[0008] Optionally, the heating circuit integrates a battery pack, the four-way valve, the first water pump, a Chiller heat exchanger and a PTC heater which are sequentially connected through pipelines;

[0009] The water outlet of the battery pack is connected to the first interface of the four-way valve, the second interface of the four-way valve is connected to one end of the first water pump, the other end of the first water pump is connected to the first interface of the Chiller heat exchanger, the second interface of the Chiller heat exchanger is connected to one end of the PTC heater, and the other end of the PTC heater is connected to the water inlet of the battery pack;

[0010] The thermal management controller in the vehicle controls the heating circuit, the cooling circuit, and the motor circuit to selectively communicate through corresponding water inlets and outlets of the four-way valve in response to the water outlet temperature of the battery pack reaching a preset condition, so that the water outlet temperature of the battery pack is within a calibrated range, including:

[0011] When the water outlet temperature of the battery pack reaches a first preset condition, the thermal management controller in the vehicle controls the four-way valve to open the first interface and the second interface to connect the heating circuit so that the water outlet temperature of the battery pack is within a calibrated range.

[0012] Optionally, the cooling circuit integrates a chiller heat exchanger, a compressor, a condenser and a thermal expansion valve which are sequentially connected through pipelines;

[0013] The third interface of the Chiller heat exchanger is connected to one end of the compressor, the other end of the compressor is connected to one end of the condenser, the other end of the condenser is connected to one end of the thermal expansion valve, and the other end of the thermal expansion valve is connected to the fourth interface of the Chiller heat exchanger;

[0014] The thermal management controller in the vehicle controls the heating circuit, the cooling circuit, and the motor circuit to selectively communicate through corresponding water inlets and outlets of the four-way valve in response to the water outlet temperature of the battery pack reaching a preset condition, so that the water outlet temperature of the battery pack is within a calibrated range, including:

[0015] When the water outlet temperature of the battery pack reaches a second preset condition, the thermal management controller in the vehicle controls the four-way valve to open the first interface and the second interface to connect the heating circuit and the cooling circuit so that the water outlet temperature of the battery pack is within a calibrated range.

[0016] Optionally, the motor circuit integrates the four-way valve, the second water pump, the DCDC, the motor, the three-way valve and the radiator which are sequentially connected through pipelines;

[0017] The third interface of the four-way valve is connected to one end of the second water pump, the other end of the second water pump is connected to one end of the DCDC, the other end of the DCDC is connected to one end of the motor, the other end of the motor is connected to the first interface of the three-way valve, the second interface of the three-way valve is connected to one end of the radiator, and the other end of the radiator is connected to the fourth interface of the four-way valve;

[0018] The thermal management controller in the vehicle controls the heating circuit, the cooling circuit, and the motor circuit to selectively communicate through corresponding water inlets and outlets of the four-way valve in response to the water outlet temperature of the battery pack reaching a preset condition, so that the water outlet temperature of the battery pack is within a calibrated range, including:

[0019] When the water outlet temperature of the battery pack reaches the third preset condition, the thermal management controller in the vehicle controls the four-way valve to open the first interface, the second interface, the third interface and the fourth interface, and controls the three-way valve to open the first interface and the second interface, so that the motor circuit is connected, so that the water outlet temperature of the battery pack is within the calibrated range.

[0020] Optionally, the thermal management system further comprises a cooling fan;

[0021] The cooling fan is arranged on one side of the radiator.

[0022] Optionally, the thermal management system further includes a waste heat recovery pipe;

[0023] Wherein, one end of the waste heat recovery pipe is connected to the third interface of the three-way valve through a pipeline, and the other end of the waste heat recovery pipe is connected to the fourth interface of the four-way valve through a pipeline;

[0024] When the external ambient temperature reaches the fourth preset condition, the thermal management controller in the vehicle controls the four-way valve to open the first interface, the second interface, the third interface and the fourth interface, and controls the three-way valve to open the first interface and the third interface, so that the heating circuit and the waste heat recovery pipe are connected, so that the water outlet temperature of the battery pack is within the calibrated range.

[0025] Optionally, the thermal management system further comprises an expansion kettle connected to the heating circuit, the cooling circuit and the motor circuit through pipelines.

[0026] Optionally, the thermal management system further comprises at least one temperature sensor, which is respectively arranged in one or more of the heating circuit and the motor circuit.

[0027] Optionally, the cooling circuit further includes at least one high-pressure sensor disposed in a pipeline of the cooling circuit.

[0028] In a second aspect, an embodiment of the present application further provides a control method for a thermal management system of a vehicle battery, the thermal management system comprising: a heating circuit, a cooling circuit, a motor circuit, a four-way valve, and a battery pack;

[0029] The control method is applied to a thermal management controller in a vehicle, comprising:

[0030] In response to the water outlet temperature of the battery pack reaching a preset condition, the thermal management controller in the vehicle controls the heating circuit, the cooling circuit and the motor circuit to be selectively connected through the corresponding water inlets and outlets of the four-way valve so that the water outlet temperature of the battery pack is within a calibrated range.

[0031] The embodiment of the present application provides a thermal management system and control method for a vehicle battery. In response to the temperature of the water outlet of the battery pack reaching a preset condition, the thermal management controller in the vehicle controls the heating circuit, cooling circuit and motor circuit to selectively connect through the corresponding water inlet and outlet of the four-way valve, so that the water outlet temperature of the battery pack is within the calibrated range. Heat exchange is achieved by adding a heat exchanger between the cooling circuit and the heating circuit, thereby quickly reducing the temperature of the battery pack; a four-way valve is added between the motor circuit and the heating circuit, so that the motor circuit can be connected under certain circumstances, thereby realizing energy exchange; and a waste heat recovery pipe is set in the motor circuit to achieve the purpose of saving energy consumption.

[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 One of the structural block diagrams of a thermal management system for a vehicle battery provided in an embodiment of the present application is shown;

[0035] Figure 2 A schematic diagram of a thermal management system for a vehicle battery provided in an embodiment of the present application is shown;

[0036] Figure 3 A second structural block diagram of a thermal management system for a vehicle battery provided in an embodiment of the present application is shown;

[0037] Figure 4 A flow chart of a control method for a thermal management system of a vehicle battery provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0038] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0039] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0040] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0041] The following system or method of the embodiments of the present application can be applied to any scenario requiring thermal management. The embodiments of the present application are not limited to specific application scenarios. Any solution using a thermal management system and control method for a vehicle battery provided by the embodiments of the present application is within the protection scope of the present application.

[0042] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0043] In new energy vehicles, batteries play a vital role in the vehicle system. When the battery is continuously charged and discharged, its temperature will rise sharply, which will cause damage to the battery; in an extreme temperature environment below zero, the battery will not work properly due to internal freezing at low temperature. Therefore, the thermal management system of the battery cannot be ignored. The thermal management system ensures that the battery and its related components can operate stably under actual driving conditions by controlling equipment such as compressors, condensers, and heat pumps, and will not fluctuate greatly due to extreme external temperatures. The existing cooling methods can be roughly divided into three types. The first is air cooling; the second is water cooling, which has a better cooling effect than air cooling; the third is liquid cooling, which has a strong heat dissipation effect and is suitable for high temperature environments. However, air cooling is for small-capacity batteries and is cooled by fans when the ambient temperature is suitable; water cooling is easily affected by the external ambient temperature and is not suitable in high temperature environments; the cooling medium in liquid cooling will produce certain losses during the exchange process, and its exchange structure is relatively complex and prone to failure.

[0044] Based on this, an embodiment of the present application provides a thermal management system and control method for a vehicle battery. The present application realizes heat exchange by adding a heat exchanger between the cooling circuit and the heating circuit, thereby quickly reducing the temperature of the battery pack; adds a four-way valve between the motor circuit and the heating circuit, so that the motor circuit can be connected under specific circumstances, thereby realizing energy exchange; and sets a waste heat recovery pipe in the motor circuit to achieve the purpose of saving energy.

[0045] To facilitate the understanding of the present application, the technical solution provided by the present application is described in detail below in conjunction with specific embodiments.

[0046] See also Figure 1 , Figure 1 One of the structural block diagrams of a thermal management system for a vehicle battery provided in an embodiment of the present application is shown.

[0047] like Figure 1 As shown, the thermal management system provided in the embodiment of the present application includes: a heating circuit 10 , a cooling circuit 20 , a motor circuit 30 and a four-way valve 40 .

[0048] In response to the water outlet temperature of the battery pack 50 reaching a preset condition, the thermal management controller in the vehicle controls the heating circuit 10, the cooling circuit 20 and the motor circuit 30 to be selectively connected through the corresponding water inlets and outlets of the four-way valve 40 to ensure that the water outlet temperature of the battery pack 50 is within a calibrated range.

[0049] Figure 2 FIG. 1 is a schematic diagram of a thermal management system for a vehicle battery provided by an embodiment of the present application. Figure 2As shown, in a specific implementation, as an example, the heating circuit 10 integrates a battery pack 50, the four-way valve 40, the first water pump 12, the Chiller heat exchanger 13 and the PTC heater 14 which are sequentially connected by pipelines; wherein, the water outlet of the battery pack 50 is connected to the first interface 41 of the four-way valve 40, the second interface 42 of the four-way valve 40 is connected to one end of the first water pump 12, the other end of the first water pump 12 is connected to the first interface 131 of the Chiller heat exchanger 13, the second interface 132 of the Chiller heat exchanger 13 is connected to one end of the PTC heater 14, and the other end of the PTC heater 14 is connected to the water inlet of the battery pack 50. The cooling circuit 20 integrates a Chiller heat exchanger 13, a compressor 21, a condenser 22 and a thermal expansion valve 24 which are connected in sequence through pipelines; wherein the third interface 133 of the Chiller heat exchanger 13 is connected to one end of the compressor 21, the other end of the compressor 21 is connected to one end of the condenser 22, the other end of the condenser 22 is connected to one end of the thermal expansion valve 24, and the other end of the thermal expansion valve 24 is connected to the fourth interface 134 of the Chiller heat exchanger 13. The motor circuit 30 integrates the four-way valve 40, the second water pump 31, the DCDC33, the motor 34, the three-way valve 35 and the radiator 36 connected in sequence through pipelines; wherein the third interface 43 of the four-way valve 40 is connected to one end of the second water pump 31, the other end of the second water pump 31 is connected to one end of the DCDC33, the other end of the DCDC33 is connected to one end of the motor 34, the other end of the motor 34 is connected to the first interface 351 of the three-way valve 35, the second interface 352 of the three-way valve 35 is connected to one end of the radiator 36, and the other end of the radiator 36 is connected to the fourth interface 44 of the four-way valve 40. Here, the pipeline is filled with coolant. The coolant may include but is not limited to: methanol, ethylene glycol and glycerol.

[0050] Figure 3 FIG2 shows a second structural block diagram of a thermal management system for a vehicle battery provided in an embodiment of the present application. Figure 3As shown, the thermal management system further includes a cooling fan 37; the cooling fan 37 is arranged on one side of the radiator 36, and is used to cool the refrigerant in the pipeline. The thermal management system further includes a waste heat recovery pipe 60; wherein one end of the waste heat recovery pipe 60 is connected to the third interface 353 of the three-way valve 35 through a pipeline, and the other end of the waste heat recovery pipe 60 is connected to the fourth interface 44 of the four-way valve 40 through a pipeline. The thermal management system further includes an expansion kettle 70, which is connected to the heating circuit 10, the cooling circuit 20 and the motor circuit 30 through a pipeline. Here, the kettle is used to store the coolant used in the thermal management system and replenish the coolant for the pipeline. In order to obtain the working condition of each circuit in the thermal management system, the thermal management system further includes at least one temperature sensor, which is respectively arranged in one or more of the heating circuit 10 and the motor circuit 30, and the cooling circuit 20 also includes at least one high-pressure sensor arranged in the pipeline of the cooling circuit 20.

[0051] Regarding the thermal management controller in the vehicle, in response to the water outlet temperature of the battery pack 50 reaching a preset condition, controlling the heating circuit 10, the cooling circuit 20 and the motor circuit 30 to selectively communicate through the corresponding water inlets and outlets of the four-way valve 40, so that the water outlet temperature of the battery pack 50 is within a calibrated range, in specific implementation, the following four situations are included:

[0052] In the first case, when the water outlet temperature of the battery pack 50 reaches a first preset condition, the thermal management controller in the vehicle controls the four-way valve 40 to open the first interface 41 and the second interface 42 to connect the heating circuit 10 so that the water outlet temperature of the battery pack 50 is within a calibrated range.

[0053] Specifically, as an example, first, the temperature sensor 11 at the water outlet of the battery pack 50 detects the temperature of the coolant in the pipe flowing out of the battery pack 50, and sends the detected temperature to the thermal management controller, and the thermal management controller judges the signal from the temperature sensor 11 at the water outlet of the battery pack 50. Subsequently, when the temperature of the coolant in the water outlet pipe of the battery pack 50 is lower than the lower limit of the calibration range and higher than the preset low temperature value, the thermal management controller controls the four-way valve 40 to open the first interface 41 and the second interface 42, thereby building a connection channel between the first interface 41 and the second interface 42 of the four-way valve 40. Then, the thermal management controller issues an instruction to open the switch to the first water pump 12, and the first water pump 12 is turned on after receiving the instruction, pushing the coolant to flow in the pipe. Secondly, the thermal management controller sends a start command to the PTC heater 14, and the PTC heater 14 starts to heat up the heating circuit 10 after starting. Secondly, the heat conversion is realized through the Chiller heat exchanger 13, thereby ensuring that the temperature of the cooling circuit 20 rises. Finally, the first water pump 12 pushes the coolant through the pipeline, delivers the heated coolant to the inside of the battery pack 50, and heats the battery pack 50 until the coolant temperature in the water outlet pipeline of the battery pack 50 is within the calibration range. The temperature sensor 15 at the water inlet of the battery pack 50 detects the temperature of the coolant in the pipeline entering the battery pack 50 to prevent the temperature from being too high or too low and thus damaging the battery.

[0054] In the second case, when the water outlet temperature of the battery pack 50 reaches the second preset condition, the thermal management controller in the vehicle controls the four-way valve 40 to open the first interface 41 and the second interface 42, so that the heating circuit 10 and the cooling circuit 20 are connected, so that the water outlet temperature of the battery pack 50 is within the calibrated range.

[0055] Specifically, as an example, first, the temperature sensor 11 at the water outlet of the battery pack 50 detects the temperature of the coolant in the pipe flowing out of the battery pack 50, and sends the detected temperature to the thermal management controller, and the thermal management controller judges the signal from the temperature sensor 11 at the water outlet of the battery pack 50. Subsequently, when the vehicle is in the driving or parking charging stage, when the temperature of the coolant in the water outlet pipe of the battery pack 50 is higher than the upper limit of the calibration range and lower than the preset high temperature value, the thermal management controller controls the four-way valve 40 to open the first interface 41 and the second interface 42, thereby building a connection channel between the first interface 41 and the second interface 42 of the four-way valve 40. Then, the thermal management controller issues an instruction to open the switch to the first water pump 12, and the first water pump 12 is turned on after receiving the instruction to push the coolant to flow in the pipe. Secondly, the thermal management controller sends a compression instruction to the compressor 21, and the compressor 21 compresses the coolant in the pipe in the cooling module to a preset pressure to obtain a high-temperature and high-pressure coolant. Next, the condenser 22 exchanges heat between the high-temperature and high-pressure coolant and the ambient temperature to obtain a low-temperature and high-pressure coolant. Furthermore, the thermal management controller collects the pressure of the coolant in the pipeline according to the high-pressure sensor 23, controls the opening degree of the thermal expansion valve 24, and allows the low-temperature high-pressure coolant to pass according to the preset flow rate to obtain the low-temperature low-pressure coolant. Finally, the heat exchange is completed through the Chiller heat exchanger 13, the coolant in the pipeline of the heating circuit 10 is cooled, and the battery pack 50 is cooled until the coolant temperature in the water outlet pipeline of the battery pack 50 is within the calibration range.

[0056] In the third case, when the water outlet temperature of the battery pack 50 reaches the third preset condition, the thermal management controller in the vehicle controls the four-way valve 40 to open the first interface 41, the second interface 42, the third interface 43 and the fourth interface 44, and controls the three-way valve 35 to open the first interface 351 and the second interface 352, so that the motor circuit 30 is connected, so that the water outlet temperature of the battery pack 50 is within the calibrated range.

[0057] Specifically, as an example, first, the temperature sensor 11 at the water outlet of the battery pack 50 detects the temperature of the coolant in the pipe flowing out of the battery pack 50, and sends the detected temperature to the thermal management controller, and the thermal management controller judges the signal from the temperature sensor 11 at the water outlet of the battery pack 50. Subsequently, when the vehicle is in the parking charging stage, when the temperature of the coolant in the water outlet pipe of the battery pack 50 is higher than the preset high temperature value, the thermal management controller controls the four-way valve 40 to open the first interface 41 and the third interface 43, thereby building a connecting channel between the first interface 41 and the third interface 43 of the four-way valve 40, so that the coolant in the pipe of the heating circuit 10 and the coolant in the pipe of the motor circuit 30 are connected. Then, the thermal management controller issues an instruction to open the switch to the first water pump 12 and the second water pump 31, and the first water pump 12 and the second water pump 31 are turned on after receiving the instruction, pushing the coolant to flow in the pipe. Secondly, the thermal management controller controls to open the DCDC33 and the motor, and the DCDC33 and the motor power the motor circuit 30. Next, the thermal management controller controls the three-way valve 35 to open the first interface 351 and the second interface 352, thereby building a connection channel between the first interface 351 and the second interface 352 of the three-way valve 35. Furthermore, the thermal management controller controls the cooling fan 37 to turn on to cool the coolant flowing through the radiator 36. Next, the thermal management controller controls the four-way valve 40 to open the second interface 42 and the fourth interface 44, thereby building a connection channel between the second interface 41 and the fourth interface 44 of the four-way valve 40, so that the coolant in the pipeline of the motor circuit 30 and the coolant in the pipeline of the heating circuit 10 are connected. Finally, the coolant in the pipeline of the heating circuit 10 is cooled, and the battery pack 50 is cooled until the coolant temperature in the water outlet pipeline of the battery pack 50 is within the calibrated range.

[0058] In the fourth case, when the external ambient temperature reaches the fourth preset condition, the thermal management controller in the vehicle controls the four-way valve 40 to open the first interface 41, the second interface 42, the third interface 43 and the fourth interface 44, and controls the three-way valve 35 to open the first interface 351 and the third interface 353, so that the heating circuit 10 and the waste heat recovery pipe 60 are connected, so that the water outlet temperature of the battery pack 50 is within the calibrated range.

[0059] Specifically, as an example, first, during the driving process of the car, when the external environment is at a low temperature, the PTC heater 14 of the heating circuit 10 is insufficiently heated or heated too slowly due to the external environment, and the water outlet temperature sensor 11 of the battery pack 50 and the motor temperature sensor 32 send a signal to the thermal management controller. Subsequently, the thermal management controller controls the four-way valve 40 to open the first interface 41 and the third interface 43, thereby building a connecting channel between the first interface 41 and the third interface 43 of the four-way valve 40, so that the coolant in the pipeline of the heating circuit 10 and the coolant in the pipeline of the motor circuit 30 are connected. Then, the thermal management controller issues an instruction to open the switch to the first water pump 12 and the second water pump 31, and the first water pump 12 and the second water pump 31 are turned on after receiving the instruction, pushing the coolant to flow in the pipeline. Secondly, the thermal management controller controls the opening of DCDC33 and the motor 34, and DCDC33 and the motor 34 supply power to the motor circuit 30. Next, the thermal management controller controls the three-way valve 35 to open the first interface 351 and the third interface 353, thereby building a connection channel between the first interface 351 and the third interface 353 of the three-way valve 35. Furthermore, the waste heat recovery pipe 60 heats the coolant in the pipeline of the motor circuit 30 by recovering a large amount of heat generated by the operation of the motor 34. Next, the thermal management controller controls the four-way valve 40 to open the second interface 42 and the fourth interface 44, thereby building a connection channel between the second interface 42 and the fourth interface 44 of the four-way valve 40, so that the coolant in the pipeline of the motor circuit 30 and the coolant in the pipeline of the heating circuit 10 are connected. Finally, the heat is transmitted to the battery pack 50 of the heating circuit 10, and the temperature of the battery pack 50 is increased, thereby achieving energy saving, until the coolant temperature in the outlet pipeline of the battery pack 50 is within the calibrated range.

[0060] A thermal management system for a vehicle battery provided in an embodiment of the present application realizes heat exchange by adding a heat exchanger between the cooling circuit and the heating circuit, thereby quickly reducing the temperature of the battery pack; a four-way valve is added between the motor circuit and the heating circuit to enable the motor circuit to be connected under specific circumstances, thereby realizing energy exchange; and a waste heat recovery pipe is provided in the motor circuit to achieve the purpose of saving energy consumption.

[0061] Based on the same application concept, the embodiments of the present application also provide a control method for a thermal management system of a vehicle battery corresponding to a thermal management system of a vehicle battery provided in the above embodiments. Since the principle of solving the problem by the control method in the embodiments of the present application is similar to that of the thermal management system of the vehicle battery in the above embodiments of the present application, the implementation of the control method can refer to the implementation of the thermal management system, and the repeated parts will not be repeated.

[0062] Figure 4 A flow chart of a control method of a thermal management system of a vehicle battery provided by an embodiment of the present application is shown. Figure 4As shown, the control method is applied to a thermal management controller in a vehicle, comprising:

[0063] Step S401, determining whether the water outlet temperature of the battery pack reaches a preset condition.

[0064] Step S402, in response to the water outlet temperature of the battery pack reaching a preset condition, the heating circuit, the cooling circuit and the motor circuit are controlled to be selectively connected through the corresponding water inlets and outlets of the four-way valve so that the water outlet temperature of the battery pack is within a calibrated range.

[0065] Optionally, the heating circuit 10 integrates a battery pack 50, the four-way valve 40, the first water pump 12, the Chiller heat exchanger 13 and the PTC heater 14 which are connected in sequence through pipelines; wherein, the water outlet of the battery pack 50 is connected to the first interface 41 of the four-way valve 40, the second interface 42 of the four-way valve 40 is connected to one end of the first water pump 12, the other end of the first water pump 12 is connected to the first interface 131 of the Chiller heat exchanger 13, the second interface 132 of the Chiller heat exchanger 13 is connected to one end of the PTC heater 14, and the other end of the PTC heater 14 is connected to the water inlet of the battery pack 50; regarding step S402, in the specific implementation, as an example, it includes: when the water outlet temperature of the battery pack 50 reaches a first preset condition, the thermal management controller in the vehicle controls the four-way valve 40 to open the first interface 41 and the second interface 42, so that the heating circuit 10 is connected, so that the water outlet temperature of the battery pack 50 is within the calibration range.

[0066] Optionally, the cooling circuit 20 integrates a Chiller heat exchanger 13, a compressor 21, a condenser 22 and a thermal expansion valve 24 which are connected in sequence through pipelines; wherein, the third interface 133 of the Chiller heat exchanger 13 is connected to one end of the compressor 21, the other end of the compressor 21 is connected to one end of the condenser 22, the other end of the condenser 22 is connected to one end of the thermal expansion valve 24, and the other end of the thermal expansion valve 24 is connected to the fourth interface 134 of the Chiller heat exchanger 13; regarding step S402, in the specific implementation, as an example, it includes: when the water outlet temperature of the battery pack 50 reaches the second preset condition, the thermal management controller in the vehicle controls the four-way valve 40 to open the first interface 41 and the second interface 42, so that the heating circuit 10 and the cooling circuit 20 are connected, so that the water outlet temperature of the battery pack 50 is within the calibration range.

[0067] Optionally, the motor circuit 30 integrates the four-way valve 40, the second water pump 31, the DCDC33, the motor 34, the three-way valve 35 and the radiator 36 which are sequentially connected by pipelines; wherein the third interface 43 of the four-way valve 40 is connected to one end of the second water pump 31, the other end of the second water pump 31 is connected to one end of the DCDC33, the other end of the DCDC33 is connected to one end of the motor 34, the other end of the motor 34 is connected to the first interface 351 of the three-way valve 35, and the second interface 352 of the three-way valve 35 is connected to the One end, and the other end of the radiator 36 is connected to the fourth interface 44 of the four-way valve 40; regarding step S402, in the specific implementation, as an example, it includes: when the water outlet temperature of the battery pack 50 reaches the third preset condition, the thermal management controller in the vehicle controls the four-way valve 40 to open the first interface 41, the second interface 42, the third interface 43 and the fourth interface 44, and controls the three-way valve 35 to open the first interface 351 and the second interface 352, so that the motor circuit 30 is connected, so that the water outlet temperature of the battery pack 50 is within the calibrated range.

[0068] Optionally, the thermal management system further includes a cooling fan 37 ; the cooling fan 37 is disposed on one side of the radiator 36 .

[0069] Optionally, the thermal management system also includes a waste heat recovery pipe 60; wherein, one end of the waste heat recovery pipe 60 is connected to the third interface 353 of the three-way valve 35 through a pipe, and the other end of the waste heat recovery pipe 60 is connected to the fourth interface 44 of the four-way valve 40 through a pipe; when the external ambient temperature reaches the fourth preset condition, the thermal management controller in the vehicle controls the four-way valve 40 to open the first interface 41, the second interface 42, the third interface 43 and the fourth interface 44, and controls the three-way valve 35 to open the first interface 351 and the third interface 353, so that the heating circuit 10 and the waste heat recovery pipe 60 are connected, so that the water outlet temperature of the battery pack 50 is within the calibrated range.

[0070] Optionally, the thermal management system further includes an expansion kettle 70 connected to the heating circuit 10, the cooling circuit 20 and the motor circuit 30 through pipelines.

[0071] Optionally, the thermal management system further includes at least one temperature sensor, which is respectively arranged in one or more of the heating circuit 10 and the motor circuit 30 .

[0072] Optionally, the cooling circuit 20 further includes at least one high-pressure sensor disposed in a pipeline of the cooling circuit 20 .

[0073] A control method for a thermal management system of a vehicle battery provided in an embodiment of the present application realizes heat exchange by adding a heat exchanger between a cooling circuit and a heating circuit, thereby quickly reducing the temperature of a battery pack; a four-way valve is added between a motor circuit and a heating circuit so that the motor circuit can be connected under certain circumstances, thereby realizing energy exchange; and a waste heat recovery pipe is provided in the motor circuit to achieve the purpose of saving energy consumption.

[0074] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, 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 communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0075] 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.

[0076] 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.

[0077] 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 non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, 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, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0078] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A thermal management system for a vehicle battery, characterized in that: The thermal management system includes: a heating circuit, a cooling circuit, a motor circuit, a four-way valve and a battery pack; In response to the water outlet temperature of the battery pack reaching a preset condition, the thermal management controller in the vehicle controls the heating circuit, the cooling circuit and the motor circuit to be selectively connected through the corresponding water inlets and outlets of the four-way valve so that the water outlet temperature of the battery pack is within a calibrated range.

2. The thermal management system according to claim 1, characterized in that: The heating circuit integrates a battery pack, the four-way valve, a first water pump, a Chiller heat exchanger and a PTC heater which are sequentially connected through pipelines; The water outlet of the battery pack is connected to the first interface of the four-way valve, the second interface of the four-way valve is connected to one end of the first water pump, the other end of the first water pump is connected to the first interface of the Chiller heat exchanger, the second interface of the Chiller heat exchanger is connected to one end of the PTC heater, and the other end of the PTC heater is connected to the water inlet of the battery pack; The thermal management controller in the vehicle controls the heating circuit, the cooling circuit, and the motor circuit to selectively communicate through corresponding water inlets and outlets of the four-way valve in response to the water outlet temperature of the battery pack reaching a preset condition, so that the water outlet temperature of the battery pack is within a calibrated range, including: When the water outlet temperature of the battery pack reaches a first preset condition, the thermal management controller in the vehicle controls the four-way valve to open the first interface and the second interface to connect the heating circuit so that the water outlet temperature of the battery pack is within a calibrated range.

3. The thermal management system according to claim 2, characterized in that: The cooling circuit integrates a chiller heat exchanger, a compressor, a condenser and a thermal expansion valve which are sequentially connected through pipelines; The third interface of the Chiller heat exchanger is connected to one end of the compressor, the other end of the compressor is connected to one end of the condenser, the other end of the condenser is connected to one end of the thermal expansion valve, and the other end of the thermal expansion valve is connected to the fourth interface of the Chiller heat exchanger; The thermal management controller in the vehicle controls the heating circuit, the cooling circuit, and the motor circuit to selectively communicate through corresponding water inlets and outlets of the four-way valve in response to the water outlet temperature of the battery pack reaching a preset condition, so that the water outlet temperature of the battery pack is within a calibrated range, including: When the water outlet temperature of the battery pack reaches a second preset condition, the thermal management controller in the vehicle controls the four-way valve to open the first interface and the second interface to connect the heating circuit and the cooling circuit so that the water outlet temperature of the battery pack is within a calibrated range.

4. The thermal management system according to claim 3, characterized in that: The motor circuit integrates the four-way valve, the second water pump, the DCDC, the motor, the three-way valve and the radiator which are sequentially connected through pipelines; The third interface of the four-way valve is connected to one end of the second water pump, the other end of the second water pump is connected to one end of the DCDC, the other end of the DCDC is connected to one end of the motor, the other end of the motor is connected to the first interface of the three-way valve, the second interface of the three-way valve is connected to one end of the radiator, and the other end of the radiator is connected to the fourth interface of the four-way valve; The thermal management controller in the vehicle controls the heating circuit, the cooling circuit, and the motor circuit to selectively communicate through corresponding water inlets and outlets of the four-way valve in response to the water outlet temperature of the battery pack reaching a preset condition, so that the water outlet temperature of the battery pack is within a calibrated range, including: When the water outlet temperature of the battery pack reaches the third preset condition, the thermal management controller in the vehicle controls the four-way valve to open the first interface, the second interface, the third interface and the fourth interface, and controls the three-way valve to open the first interface and the second interface, so that the motor circuit is connected, so that the water outlet temperature of the battery pack is within the calibrated range.

5. The thermal management system according to claim 4, characterized in that: The thermal management system further includes a cooling fan; The cooling fan is arranged on one side of the radiator.

6. The thermal management system according to claim 4, characterized in that: The thermal management system also includes a waste heat recovery pipe; Wherein, one end of the waste heat recovery pipe is connected to the third interface of the three-way valve through a pipeline, and the other end of the waste heat recovery pipe is connected to the fourth interface of the four-way valve through a pipeline; When the external ambient temperature reaches the fourth preset condition, the thermal management controller in the vehicle controls the four-way valve to open the first interface, the second interface, the third interface and the fourth interface, and controls the three-way valve to open the first interface and the third interface, so that the heating circuit and the waste heat recovery pipe are connected, so that the water outlet temperature of the battery pack is within the calibrated range.

7. The thermal management system according to claim 1, characterized in that: The thermal management system also includes an expansion kettle connected to the heating circuit, the cooling circuit and the motor circuit through pipelines.

8. The thermal management system according to claim 1, characterized in that: The thermal management system further includes at least one temperature sensor, which is respectively arranged in one or more of the heating circuit and the motor circuit.

9. The thermal management system according to claim 1, characterized in that: The cooling circuit also includes at least one high-pressure sensor disposed in a pipeline of the cooling circuit.

10. A control method for a thermal management system of a vehicle battery, characterized in that: The thermal management system includes: a heating circuit, a cooling circuit, a motor circuit, a four-way valve and a battery pack; The control method is applied to a thermal management controller in a vehicle, comprising: In response to the water outlet temperature of the battery pack reaching a preset condition, the thermal management controller in the vehicle controls the heating circuit, the cooling circuit and the motor circuit to be selectively connected through the corresponding water inlets and outlets of the four-way valve so that the water outlet temperature of the battery pack is within a calibrated range.

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