Vehicle thermal management system, control method, and vehicle

Abstract

The application belongs to the technical field of comprehensive thermal systems of new energy vehicles, and provides a vehicle thermal management system, a control method and a vehicle.The vehicle thermal management system comprises a first cooling liquid circulation loop, a second cooling liquid circulation loop and an air conditioning circulation system;the first cooling liquid circulation loop is connected in series with a heat generating component and a radiator, the radiator cools the heat generating component in the vehicle through cooling liquid;the second cooling liquid circulation loop is connected in series with a battery pack, the second cooling liquid circulation loop cools or heats the battery pack through cooling liquid;the air conditioning circulation system can exchange heat with the cooling liquid in the first cooling liquid circulation loop and the cooling liquid of the second cooling liquid circulation loop respectively;wherein, the first cooling liquid circulation loop can be connected to the second cooling liquid circulation loop to exchange heat with the second cooling liquid circulation loop through cooling liquid.The application aims to solve the technical problems of waste of waste heat, non-circulation and low energy utilization rate in the vehicle thermal management system in the prior art.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of comprehensive thermal systems of new energy vehicles, and particularly relates to a vehicle thermal management system, a control method and a vehicle. BACKGROUND

[0002] Thermal management technology is one of the core technologies of electric vehicles, and its function is to keep components such as driving motors and power batteries within an appropriate temperature range under all working conditions.

[0003] An electric vehicle thermal management system usually includes a motor cooling system and a battery thermal management system. The motor cooling system is responsible for cooling components such as driving motors or motor controllers when their temperatures are high, and the battery thermal management system is responsible for heating power batteries when the ambient temperature is low and cooling them when their temperatures are high.

[0004] In the existing vehicle thermal management system, the cooling system of the motor and the cooling system of the battery are independently arranged. The heat generated by the motor is discharged to the environment through the radiator, causing waste of energy. The battery thermal management system uses a water heating PTC heater to heat the battery, increasing the power consumption of the battery and reducing the cruising range of the vehicle. SUMMARY

[0005] The purpose of the present application is to provide a vehicle thermal management system, a control method and a vehicle, aiming to solve the technical problems of waste of waste heat, non-circulation and low energy utilization rate in the vehicle thermal management system in the prior art.

[0006] The first purpose of the present application is to provide a vehicle thermal management system, comprising:

[0007] A first cooling liquid circulation loop in series with a heat generating component and a radiator, the radiator cooling the heat generating component through cooling liquid, the heat generating component including at least one or a combination of one or more of a motor, a power distribution box and a voltage converter;

[0008] A second cooling liquid circulation loop in series with a battery pack, the second cooling liquid circulation loop cooling or heating the battery pack through cooling liquid; and

[0009] An air conditioning circulation system connected with the first cooling liquid circulation loop and the second cooling liquid circulation loop respectively, and performing heat exchange with the cooling liquid in the first cooling liquid circulation loop and the cooling liquid in the second cooling liquid circulation loop respectively;

[0010] The first cooling liquid circulation loop is connected to the second cooling liquid circulation loop to perform heat exchange with the second cooling liquid circulation loop through cooling liquid.

[0011] Further, the air conditioning circulation system has a refrigeration mode and a heating mode; the air conditioning circulation system comprises a first condensing evaporator and a second condensing evaporator connected in series to form a closed loop, the first condensing evaporator is connected to the first cooling liquid circulation loop, and the first condensing evaporator is located between the heat generating component and the heat sink; the second condensing evaporator is connected to the second cooling liquid circulation loop, and the second condensing evaporator is located at the cooling liquid output end of the battery pack.

[0012] Further, the first cooling liquid circulation loop further comprises a first control valve, a second control valve and a third control valve connected in series with the heat generating component and the heat sink to form a loop;

[0013] The first condensing evaporator is connected between the heat generating component and the heat sink; the cooling liquid input end of the heat generating component, the cooling liquid output end of the condensing evaporator, the first outlet of the heat sink and the cooling liquid output end of the first condensing evaporator are all connected or disconnected through the first control valve; the second outlet of the heat sink and the cooling liquid input end of the first condensing evaporator and the cooling liquid input end of the heat generating component are all connected or disconnected through the second control valve; the cooling liquid output end of the heat generating component, the second cooling liquid circulation loop, the cooling liquid input end of the first condensing evaporator and the inlet of the heat sink are all connected through the third control valve.

[0014] Further, the first cooling liquid circulation loop further comprises a water overflow tank and a first electronic water pump, the first electronic water pump is connected to the inlet of the heat sink, and the water overflow tank is connected between the first electronic water pump and the first condensing evaporator.

[0015] Further, the second cooling liquid circulation loop further comprises a second electronic water pump and a stop valve connected in series to form a loop, the second electronic water pump is connected to the cooling liquid input end of the second condensing evaporator, and the stop valve is connected between the battery pack and the second electronic water pump.

[0016] Further, the first control valve is a three-way valve, the three connection ports of the first control valve are connected with the first outlet of the heat sink, the cooling liquid input end of the heat generating component and the cooling liquid output end of the first condensing evaporator respectively; the second control valve is a three-way valve, the three connection ports of the second control valve are connected with the cooling liquid input end of the first condensing evaporator, the second outlet of the heat sink and the cooling liquid input end of the heat generating component respectively; the third control valve is a four-way valve, the four connection ports of the third control valve are connected with the cooling liquid output end of the heat generating component, the cooling liquid input end of the first condensing evaporator, the inlet of the heat sink and the cooling liquid input end of the second condensing evaporator respectively.

[0017] A second object of the present application is a control method of a vehicle thermal management system for controlling a vehicle thermal management system according to any one of the preceding items, the control method comprising:

[0018] determining whether the passenger cabin has a cooling demand;

[0019] determining whether the battery pack has a cooling demand;

[0020] when both the passenger cabin and the battery pack have a cooling demand, controlling the vehicle thermal management system to enter a first mode, the first mode comprising: controlling, by the first control valve, the first outlet of the radiator to be in communication with the cooling liquid input end of the heat generating component, controlling, by the second control valve, the second outlet of the radiator to be in communication with the cooling liquid input end of the first condenser evaporator, controlling, by the third control valve, the cooling liquid output end of the heat generating component to be in communication with the inlet of the radiator, so as to form a closed loop between the heat generating component and the radiator, and form a closed loop between the first condenser evaporator, the heat generating component and the radiator, and simultaneously form a closed loop between the battery pack and the second condenser evaporator.

[0021] Further, the control method further comprises:

[0022] determining whether the passenger cabin has a heating demand;

[0023] determining whether the battery pack has a heating demand;

[0024] when both the passenger cabin and the battery pack have a heating demand, controlling the vehicle thermal management system to enter a second mode, the second mode comprising: controlling, by the first control valve, the cooling liquid output end of the first condenser evaporator to be in communication with the cooling liquid input end of the heat generating component, controlling the second control valve to be closed, controlling, by the third control valve, the cooling liquid output end of the heat generating component to be in communication with the cooling liquid input end of the first condenser evaporator, so as to form a closed loop between the heat generating component and the first condenser evaporator in series, and form a closed loop between the battery pack and the second condenser evaporator.

[0025] Further, when the vehicle management system is in the second mode, and when the temperature of the cooling liquid output end of the first condenser evaporator is lower than the ambient temperature, controlling the first control valve to be closed, so as to make the cooling liquid output end of the first condenser evaporator in communication with the inlet of the radiator, controlling, by the second control valve, the cooling liquid input end of the heat generating component to be in communication with the second outlet of the radiator, so as to form a closed loop between the heat generating component, the first condenser evaporator and the radiator in series.

[0026] Further, the control method further comprises:

[0027] determining whether the battery pack has a heating demand;

[0028] When the battery pack has heating requirements, the vehicle thermal management system is controlled to enter a third mode, the third mode comprising: the first cooling liquid circulation loop and the second cooling liquid circulation loop are in communication, the second control valve is controlled to be closed, the second condensing evaporator cooling liquid output end and the cooling liquid input end of the heat generating component are controlled to be in communication by the first control valve, the second condensing evaporator and the heat generating component are connected in series to form a closed loop; the cooling liquid output end of the heat generating component and the cooling liquid input end of the second condensing evaporator are controlled to be in communication by the third control valve, the second condensing evaporator and the battery are connected in series to form a closed loop, and the heat generating component is arranged in parallel with the battery pack.

[0029] A third object of the present application is to provide a vehicle comprising the vehicle thermal management system according to any one of the preceding items.

[0030] The vehicle thermal management system, the control method and the vehicle of the present application have the following beneficial effects compared with the prior art: compared with the prior art, the vehicle thermal management system, the control method and the vehicle of the present application enable the air conditioning circulation system to exchange heat with the cooling liquid in the first cooling liquid circulation loop and the cooling liquid in the second cooling liquid circulation loop, and the first cooling liquid circulation loop and the second cooling liquid circulation loop can also exchange heat, so that the waste heat generated by the air conditioning circulation system and the waste heat generated by the heat generating component can be used to heat the battery pack, and the waste heat generated by the heat generating component can be used to heat the air conditioning circulation system, and when the air conditioning circulation system absorbs heat, it can also be used to cool the battery pack; the excess heat generated in the air conditioning circulation system, the first cooling liquid circulation loop and the second cooling liquid circulation loop can be transferred by the cooling liquid to be utilized, thereby meeting the heat requirements of each system, fully utilizing the heat in the air conditioning circulation system, the first cooling liquid circulation loop and the second cooling liquid circulation loop, saving energy, and the battery can be cooled or heated by the waste heat in the system without the need for additional heating systems, which is conducive to simplifying the original thermal management pipeline of the vehicle and improving the energy utilization rate of the vehicle thermal management system. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application or the prior art description. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 is a schematic diagram of the pipeline of a vehicle thermal management system provided by an embodiment of the present application;

[0033] Figure 2is a schematic diagram of a pipeline of a vehicle thermal management system in a first mode provided by an embodiment of the present application;

[0034] Figure 3 is a schematic diagram of a pipeline of a vehicle thermal management system in a second mode provided by an embodiment of the present application Figure 1 ;

[0035] Figure 4 is a schematic diagram of a pipeline of a vehicle thermal management system in a second mode provided by an embodiment of the present application Figure 2 ;

[0036] Figure 5 is a schematic diagram of a pipeline of a vehicle thermal management system in a third mode provided by an embodiment of the present application.

[0037] Legend: 1, first coolant circulation loop; 11, heat generating component; 111, high-voltage component; 112, motor; 12, radiator; 13, first electronic water pump; 14, overflow tank; 15, first control valve; 16, second control valve; 17, third control valve; 2, second coolant circulation loop; 21, battery pack; 22, second electronic water pump; 23, stop valve; 3, air conditioning circulation system; 31, first condenser evaporator; 32, second condenser evaporator. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "upward", "vertical", "horizontal", "bottom", "inner", "outer", "inboard", "outboard", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0041] In this application, unless specifically defined otherwise, the terms "mounting", "connected", "connection", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0042] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples.

[0043] Please refer to Figure 1 As shown in the drawings, the vehicle thermal management system provided by the embodiment of the present application comprises a first cooling liquid circulation loop 1, a second cooling liquid circulation loop 2 and an air conditioning circulation system 3. The first cooling liquid circulation loop 1 is connected in series with a heat generating component 11 and a radiator 12. The radiator 12 cools the heat generating component 11 in the vehicle through cooling liquid. The heat generating component 11 at least includes one or more combinations of motor 112, power distribution box and voltage converter. The second cooling liquid circulation loop 2 is connected in series with a battery pack 21. The second cooling liquid circulation loop 2 cools or heats the battery pack 21 through cooling liquid. The air conditioning circulation system 3 has a refrigeration mode and a heating mode. The air conditioning circulation system 3 is connected with the first cooling liquid circulation loop 1 and the second cooling liquid circulation loop 2 respectively, and exchanges heat with the cooling liquid in the first cooling liquid circulation loop 1 and the cooling liquid in the second cooling liquid circulation loop 2 respectively. The first cooling liquid circulation loop 1 is connected to the second cooling liquid circulation loop 2 to exchange heat with the second cooling liquid circulation loop 2 through cooling liquid.

[0044] Specifically, the first cooling liquid circulation loop 1 is a closed circulation loop connected by pipeline. Cooling liquid flows in the pipeline. The heat generating component 11 is connected in series in the pipeline. The heat generated by the heat generating component 11 when working can be transferred to the cooling liquid. The radiator 12 can cool the cooling liquid with higher temperature. The cooled cooling liquid flows through the heat generating component 11 again to absorb the heat generated by the heat generating component 11, and cool and lower the temperature of the heat generating component 11.

[0045] The heat generating component 11 includes one or more combinations of a motor 112, a power distribution box, and a voltage converter, the motor 112 can be connected in series or parallel with the power distribution box and the voltage converter, the high-voltage component 111 includes one or more combinations of a power distribution box, a DC-DC (voltage converter), and the like, the connection relationship of each component can be combined and designed according to the requirements of the system, the motor 112, the power distribution box, and the voltage converter are mainly used to generate heat and dissipate heat to the outside during the operation of the vehicle, and the heat is transferred to the coolant, and the radiator 12 is mainly used to cool the coolant. However, it should be noted that when the temperature of the coolant is lower than the temperature of the external environment, the radiator 12 can also absorb heat from the external environment.

[0046] The second coolant circulation loop 2 is a closed circulation loop connected by a pipeline, the pipeline circulates the coolant, and the battery pack 21 is connected in series in the pipeline, and the coolant can absorb the heat of the battery pack 21 or transfer the heat to the battery pack 21.

[0047] The air conditioning circulation system 3 can exchange heat with the first coolant circulation loop 1 and the second coolant circulation loop 2 respectively; between the air conditioning circulation system 3 and the first coolant circulation loop 1, the air conditioning circulation system 3 can transfer heat to the coolant in the first coolant circulation loop 1, and the heat is dissipated through the radiator 12 to assist the air conditioning circulation system 3 to cool; the air conditioning circulation system 3 can also absorb the heat of the coolant in the first coolant circulation loop 1, which can come from the heat dissipated by the heat generating element or from the heat absorbed by the radiator 12 from the external environment; between the air conditioning circulation system 3 and the second coolant circulation loop 2, the air conditioning circulation system 3 can transfer heat to the coolant in the second coolant circulation loop 2, and the coolant is heated through the battery pack 21; the air conditioning circulation system 3 can also absorb the heat of the coolant in the second coolant circulation loop 2, and the temperature of the coolant is reduced, thereby realizing the cooling of the battery pack 21.

[0048] Furthermore, the first coolant circulation loop 1 can also be connected to the second coolant circulation loop 2, so that the coolant of the first coolant circulation loop 1 directly exchanges heat with the coolant of the second coolant circulation loop 2 and the air conditioning circulation system 3, so as to meet the purpose of cooling or heating the battery pack 21 by recycling the heat or heat energy in the first coolant circulation loop 1 and the second coolant circulation loop 2.

[0049] The vehicle thermal management system can have multiple working modes or modalities, the first coolant circulation loop 1 can selectively communicate with the second coolant circulation loop 2, the connection relationship between the air conditioning system and the first coolant circulation loop 1 and the second coolant circulation loop 2 is adjusted according to the working mode of the air conditioning circulation system 3, so that the heat between the air conditioning system and the first coolant circulation loop 1 and the second coolant circulation loop 2 can be mutually supplemented, so as to achieve reasonable utilization of energy, reduce waste heat, and improve the utilization rate of system energy.

[0050] In the embodiment, by communicating the air conditioning circulation system 3 with the first coolant circulation loop 1 and the second coolant circulation loop 2, the air conditioning circulation system 3 can exchange heat with the coolant in the first coolant circulation loop 1 and the coolant in the second coolant circulation loop 2, and the first coolant circulation loop 1 and the second coolant circulation loop 2 can also exchange heat, so that the waste heat generated by the air conditioning circulation system 3 and the waste heat generated by the heat generating component 11 can be used to heat the battery pack 21, and the waste heat generated by the heat generating component 11 can be used to heat the air conditioning circulation system 3, and when the air conditioning circulation system 3 absorbs heat, it can also be used to cool the battery pack 21; The excess heat generated in the air conditioning circulation system 3, the first coolant circulation loop 1 and the second coolant circulation loop 2 can be transmitted by the coolant to be utilized, thereby meeting the heat demand of each system, fully utilizing the heat in the air conditioning circulation system 3, the first coolant circulation loop 1 and the second coolant circulation loop 2, saving energy, and cooling or heating the battery by means of the waste heat in the system without increasing additional heating system, which is conducive to simplifying the original thermal management pipeline of the vehicle and improving the energy utilization rate of the vehicle thermal management system.

[0051] In one embodiment, the air conditioning circulation system 3 has a refrigeration mode and a heating mode; the air conditioning circulation system 3 includes a first condenser evaporator 31 and a second condenser evaporator 32 connected in series to form a closed loop, the first condenser evaporator 31 is connected to the first coolant circulation loop 1, and the first condenser evaporator 31 is located between the heat generating component 11 and the radiator 12; the second condenser evaporator 32 is connected to the second coolant circulation loop 2, and the second condenser evaporator 32 is located at the coolant output end of the battery pack 21. The air conditioning circulation system 3 further includes components such as a compressor, a throttling element, a four-way valve, a dryer, etc. connected in series with the first condenser evaporator 31 and the second condenser evaporator 32 to form a closed loop, to form an air conditioning circulation system 3 capable of refrigeration or heating. The heating and refrigeration principle of this air conditioning circulation system 3 is the same as that of the existing air conditioning system, which will not be described here.

[0052] In this embodiment, the first condenser-evaporator 31 can exchange heat with the coolant in the first coolant circulation loop 1, and the second condenser-evaporator 32 can exchange heat with the coolant in the second coolant circulation loop 2. When the air conditioning circulation system 3 is in cooling mode, the first condenser-evaporator 31 releases heat, which is transferred to the first coolant circulation loop 1. The radiator 12 absorbs the heat from the coolant, thus providing auxiliary heat dissipation for the first condenser-evaporator 31. Since the heat transfer method of the second condenser-evaporator 32 is opposite to that of the first condenser-evaporator 31, when the first condenser-evaporator 31 releases heat, the second condenser-evaporator 32 absorbs heat. The second condenser-evaporator 32 absorbs the heat from the coolant in the second coolant circulation loop 2 to achieve the purpose of cooling the battery.

[0053] When the air conditioning circulation system 3 is in heating mode, the first condenser evaporator 31 can absorb the heat of the coolant in the first coolant circulation loop 1, and at the same time, the second condenser evaporator 32 can release heat to the second coolant circulation loop 2 to heat the battery pack 21.

[0054] It is evident that this vehicle thermal management system enables the mutual transfer and replenishment of heat between the air conditioning circulation system 3, the first coolant circulation loop 1, and the second coolant circulation loop 2, thereby achieving heat balance, fully utilizing the heat in the system, saving energy, and improving the energy utilization rate of the vehicle thermal management system.

[0055] In one embodiment, refer to Figure 1 and Figure 2 As shown, the first coolant circulation loop 1 also includes a first control valve 15, a second control valve 16, and a third control valve 17, all of which are connected in series with the heat-generating component 11 and the radiator 12 to form a loop; the first condenser-evaporator 31 is connected between the heat-generating component 11 and the radiator 12; the coolant inlet of the heat-generating component 11 is connected to or disconnected from the coolant outlet of the second condenser-evaporator 32, the first outlet of the radiator 12, and the coolant outlet of the first condenser-evaporator 31 through the first control valve 15; the second outlet of the radiator 12 is connected to or disconnected from the coolant inlet of the first condenser-evaporator 31 and the coolant inlet of the heat-generating component 11 through the second control valve 16; the coolant outlet of the heat-generating component 11 is connected to the second coolant circulation loop 2, the coolant inlet of the first condenser-evaporator 31, and the inlet of the radiator 12 through the third control valve 17.

[0056] Specifically, the first coolant circulation loop 1 also includes an overflow tank 14 and a first electronic water pump 13. The first electronic water pump 13 is connected to the inlet of the radiator 12, and the overflow tank 14 is connected between the first electronic water pump 13 and the first condenser evaporator 31.

[0057] The second cooling liquid circulation loop 2 further comprises a second electronic water pump 22 and a stop valve 23 connected in series with the battery pack 21 to form a loop, the second electronic water pump 22 is connected to the cooling liquid input end of the second condenser evaporator 32, and the stop valve 23 is connected between the battery pack 21 and the second electronic water pump 22.

[0058] The first control valve 15 is a three-way valve, and the three connection ports of the first control valve 15 are respectively connected with the first outlet of the radiator 12, the cooling liquid input end of the heat generating component 11, and the cooling liquid output end of the first condenser evaporator 31; the second control valve 16 is a three-way valve, and the three connection ports of the second control valve 16 are respectively connected with the cooling liquid input end of the first condenser evaporator 31, the second outlet of the radiator 12, and the cooling liquid input end of the heat generating component 11; the third control valve 17 is a four-way valve, and the four connection ports of the third control valve 17 are respectively connected with the cooling liquid output end of the heat generating component 11, the cooling liquid input end of the first condenser evaporator 31, the inlet of the radiator, and the cooling liquid input end of the second condenser evaporator 32.

[0059] In the first cooling liquid circulation loop 1, the cooling liquid can flow from the heat generating component 11 to the first condenser evaporator 31 of the air conditioning circulation system 3, and then selectively flow to the radiator 12, and then flow from the first outlet of the radiator 12 to the heat generating component 11, so that heat is transferred and circulated among the heat generating component 11, the first condenser evaporator 31, and the radiator 12; wherein the selective flow to the radiator 12 means that the cooling liquid can flow through the radiator 12 and then flow to the heat generating component 11, or bypass the radiator 12 and directly flow to the heat generating component 11, which can be controlled according to different needs of the system.

[0060] In the second cooling liquid circulation loop 2, the cooling liquid flows to the second condenser evaporator 32 of the air conditioning circulation system 3, and the cooling liquid exchanges heat with the second condenser evaporator 32; when the second condenser evaporator 32 dissipates heat, the cooling liquid flowing through the second condenser evaporator 32 absorbs heat and can be used to heat the battery pack 21; when the second condenser evaporator 32 absorbs heat, the cooling liquid flowing through the second condenser evaporator 32 is cooled, and the low-temperature cooling liquid flows through the battery pack 21 to cool the battery.

[0061] In addition, when the first cooling liquid circulation loop 1 and the second cooling liquid circulation loop 2 are communicated, the cooling liquid in the first cooling liquid circulation loop 1 can mix and exchange heat with the cooling liquid in the second cooling liquid circulation loop 2, so that the heating of the battery pack 21 can be realized.

[0062] In the embodiment, by controlling the communication and closure of the first control valve 15, the second control valve 16 and the third control valve 17, the first cooling liquid circulation loop 1 and the second cooling liquid circulation loop 2 and the air conditioning circulation system 3 are in different connection states in combination with the high-temperature working condition or the low-temperature working condition of the air conditioning circulation system 3, so as to coordinate the heat transfer of the cooling liquid in the loop, absorb the cooling liquid heat to realize heating, release the heat to the cooling liquid to realize the purpose of cooling, make the heat in the system be fully utilized, improve the energy utilization efficiency, achieve the purpose of energy saving.

[0063] In combination with the above vehicle thermal management system, the application also provides a vehicle thermal management control method for controlling the vehicle thermal management system in the above embodiment, and the control method comprises the following steps:

[0064] determining whether the passenger compartment has a refrigeration demand;

[0065] determining whether the battery pack 21 has a refrigeration demand;

[0066] When the passenger compartment and the battery pack 21 both have a refrigeration demand, starting the air conditioning circulation system 3, controlling the vehicle thermal management system to enter the first mode, and referring to FIG. 6, the first mode comprises the following steps: Figure 2 controlling the first control valve 15 to control the first outlet of the radiator 12 to communicate with the cooling liquid input end of the heat generating component 11, controlling the second control valve 16 to control the second outlet of the radiator 12 to communicate with the cooling liquid input end of the first condenser evaporator 31, controlling the third control valve 17 to control the cooling liquid output end of the heat generating component 11 to communicate with the inlet of the radiator 12, so as to form a closed loop of the heat generating component 11 and the radiator 12, and make the first condenser evaporator 31 parallel to the heat generating component 11 and form a closed loop with the radiator 12, and at the same time, make the battery pack 21 form a closed loop with the second condenser evaporator 32.

[0067] Figure 2 A schematic diagram of the pipeline or pipeline connection when the vehicle thermal management system is in the first mode is shown in FIG. 6. Figure 2In the first mode, the air conditioning circulation system 3 is in the refrigeration mode, and the vehicle thermal management system enters the first mode. In the first cooling liquid circulation loop 1, the radiator 12 and the heat generating component 11 are connected in series to form a closed loop, in which the cooling liquid flows through the high-voltage component 111 (such as a power distribution box, a voltage converter), and then flows to the overflow tank 14 through the third control valve 17. The cooling liquid flows out of the overflow tank 14, passes through the first electronic water pump 13, and then enters the radiator 12. After being cooled by the radiator 12, the cooling liquid flows back to the heat generating component 11 through the first control valve 15. In this closed loop, the radiator 12 can cool the high-voltage component 111. At the same time, the first condenser evaporator 31 is connected in parallel with the heat generating component 11, so that the radiator 12 and the first condenser evaporator 31 are connected in series to form a closed loop. In the loop, the low-temperature cooling liquid flows out of the second outlet of the radiator 12, passes through the first condenser evaporator 31, and the first condenser evaporator 31 dissipates heat to the cooling liquid. The first condenser evaporator 31 is cooled, and the cooling water flowing out of the first condenser evaporator 31 flows through the overflow tank 14, and then flows back to the radiator 12 through the first electronic water pump 13. In this loop, the radiator 12 can assist in cooling the first condenser evaporator 31 in the air conditioning circulation system 3. The cooling loop of the heat generating component 11 is connected to the air conditioning circulation system 3 to assist in cooling the air conditioning circulation system 3.

[0068] In addition, in the first mode, in the second cooling liquid circulation loop 2, the second condenser evaporator 32 in the air conditioning circulation system 3 and the battery pack 21 are connected in series to form a closed loop. The cooling liquid flows through the second condenser evaporator 32, the second condenser evaporator 32 evaporates and absorbs heat, the cooling liquid flowing through the second condenser evaporator 32 is cooled, the low-temperature cooling liquid flows through the battery pack 21 to cool the battery pack 21, and the cooling liquid flowing out of the battery pack 21 flows into the second electronic water pump 22 through the stop valve 23, and then flows back to the second condenser evaporator 32 through the second electronic water pump 22.

[0069] In this embodiment, the radiator 12 in the heat generating component 11 loop can be applied to the air conditioning circulation system 3 to assist in cooling the first condenser evaporator 31 in the air conditioning circulation system 3. The second condenser evaporator 32 in the air conditioning circulation system 3 evaporates and absorbs heat to cool the battery pack 21. The excess heat in the first cooling liquid circulation loop 1 and the second cooling liquid circulation loop 2 can be reasonably utilized to improve the energy utilization rate of the entire system.

[0070] In one embodiment, referring to FIGS. 1 to 4, the vehicle thermal management control method further comprises: Figure 1 and Figure 3 comprises:

[0071] determining whether the passenger compartment has a heating requirement;

[0072] determining whether the battery pack 21 has a heating requirement;

[0073] When both the passenger cabin and the battery pack 21 have heating requirements, the air conditioning circulation system 3 is started, and the vehicle thermal management system is controlled to enter the second mode, which includes: controlling the first control valve 15 to control the cooling liquid output end of the first condenser evaporator 31 to communicate with the cooling liquid input end of the heat generating component 11, controlling the second control valve 16 to be closed, and controlling the third control valve 17 to control the cooling liquid output end of the heat generating component 11 to communicate with the cooling liquid input end of the first condenser evaporator 31, so that the heat generating component 11 and the first condenser evaporator 31 are connected in series to form a closed loop, and at the same time, the battery pack 21 and the second condenser evaporator 32 form a closed loop.

[0074] Figure 3 The schematic diagram of the pipeline or pipeline connection of the vehicle thermal management system in the second mode is shown in Figure 3 In the second mode, the air conditioning circulation system 3 is in a heating mode, and the vehicle thermal management system enters the second mode. In the first cooling liquid circulation loop 1, the heat generating component 11 and the first condenser evaporator 31 are connected in series to form a closed loop. In the loop, the cooling liquid flows through the high-pressure component 111 and then flows to the first condenser evaporator 31 through the third control valve 17. The cooling liquid can absorb heat when flowing through the first condenser evaporator 31. The cooling liquid flows out of the first condenser evaporator 31 and then flows into the overflow tank 14. The cooling liquid flows out of the overflow tank 14, passes through the first electronic water pump 13, and then flows back to the heat generating component 11 through the first control valve 15. In this loop, the heat generated by the heat generating component 11 can be utilized by the air conditioning circulation system 3.

[0075] In addition, in the second mode, in the second cooling liquid circulation loop 2, the second condenser evaporator 32 in the air conditioning circulation system 3 and the battery pack 21 are connected in series to form a closed loop. The cooling liquid flows through the second condenser evaporator 32, and the second condenser evaporator 32 dissipates heat. The cooling liquid flowing through the second condenser evaporator 32 absorbs heat, and the cooling liquid flowing out of the second condenser evaporator 32 flows through the battery pack 21. The high-temperature cooling liquid heats the battery pack 21. The cooling liquid flowing out of the battery pack 21 flows into the second electronic water pump 22 through the stop valve 23, and then flows back to the second condenser evaporator 32 through the second electronic water pump 22.

[0076] In this embodiment, the heat generated by the heat generating component 11 can be applied to the air conditioning circulation system 3 to provide heat for the first condenser evaporator 31. The second condenser evaporator 32 in the air conditioning circulation system 3 dissipates heat to heat the battery pack 21. The excess heat in the first cooling liquid circulation loop 1 and the second cooling liquid circulation loop 2 can be reasonably utilized to improve the energy utilization rate of the entire system.

[0077] Referring to Figure 4As shown, when the vehicle thermal management system is in the second mode, and when the temperature of the cooling liquid output end of the first condenser evaporator 31 is lower than the ambient temperature, the first control valve 15 is controlled to be closed, the cooling liquid output end of the first condenser evaporator 31 is communicated with the inlet of the radiator 12, the cooling liquid input end of the heat generating component 11 is communicated with the second outlet of the radiator 12 through the second control valve 16, and the heat generating component 11, the first condenser evaporator 31 and the radiator 12 are connected in series to form a closed loop.

[0078] In the embodiment, the radiator 12, the first condenser evaporator 31 in the air conditioning circulation system 3 and the heat generating component 11 are connected in series to form a closed loop, and when the temperature of the cooling liquid output end of the first condenser evaporator 31 is lower than the ambient temperature, the radiator 12 can absorb ambient heat to supplement the heat in the first cooling liquid circulation loop 1, thereby improving the energy utilization rate.

[0079] In addition, when the battery pack 21 needs to be cooled in the second mode, the mode of the air conditioning circulation system 3 can be adjusted to change the second condenser evaporator 32 from the condensing heat release mode to the evaporating heat absorption mode, and the heat of the battery pack 21, the heat of the heat generating component 11 and the ambient heat absorbed by the radiator 12 can be provided to the passenger compartment for heating.

[0080] In one embodiment, referring to Figure 1 and Figure 5 , the vehicle thermal management control method further comprises:

[0081] determining whether the battery pack 21 has a heating requirement;

[0082] when the battery pack 21 has a heating requirement, controlling the vehicle thermal management system to enter a third mode, and the third mode comprises: the first cooling liquid circulation loop 1 is communicated with the second cooling liquid circulation loop 2, the second control valve 16 is controlled to be closed, the cooling liquid output end of the second condenser evaporator 32 is communicated with the cooling liquid input end of the heat generating component 11 through the first control valve 15, the second condenser evaporator 32 and the heat generating component 11 are connected in series to form a closed loop; the cooling liquid output end of the heat generating component 11 is communicated with the cooling liquid input end of the second condenser evaporator 32 through the third control valve 17, the second condenser evaporator 32 and the battery are connected in series to form a closed loop, and the heat generating component 11 and the battery pack 21 are connected in parallel.

[0083] Figure 5 The pipeline or management connection schematic diagram of the vehicle thermal management system in the third mode is shown in Figure 5 , the cooling liquid flowing through the heat generating component 11 and the battery pack 21 is merged and flows into the second condenser evaporator 32 of the air conditioning circulation system 3, and after passing through the second condenser evaporator 32, the cooling liquid flows to the cooling liquid input end of the heat generating component 11 and the cooling liquid input end of the battery pack 21, respectively.

[0084] In the third mode, the vehicle thermal management system can heat the battery pack 21 by the motor 112, the heat generating component 11 and the battery pack 21 are in the branch circuit, the second condensing evaporator 32 is in the main circuit, and the heat of the heat generating component 11 heats the battery pack 21 branch circuit. If the heating function needs to be started simultaneously, the evaporative heat absorption capacity of the second condensing evaporator 32 needs to be limited to ensure that the temperature of the cooling liquid at the input end of the battery pack 21 is higher than the core temperature of the battery pack 21.

[0085] When the ambient temperature is high and the passenger compartment needs to be cooled, but the battery pack 21 needs to be heated, the third mode shown in FIG. 8 can be entered, and the air conditioning circulating system 3 can release the heat absorbed by the passenger compartment to the cooling circuit through the second condensing evaporator 32 to heat the battery. Figure 5

[0086] The application also provides a vehicle comprising a vehicle body and the vehicle thermal management system in the above embodiments mounted on the vehicle body.

[0087] The vehicle thermal management system, the control method and the vehicle, the thermal management system takes into account the condensation and evaporation functions of the refrigerant, the water-cooled first condensing evaporator 31 and the Chiller function are combined in the present application, so that a single component takes into account the condensation and evaporation functions of the refrigerant, which not only helps to reduce the complexity of the air conditioning circulating system 3, but also increases the heat transfer scheme of the cooling liquid circulating system, improves the energy utilization rate of the air conditioning circulating system 3, and makes full use of the energy of the vehicle.

[0088] Under high temperature working conditions, the heat of the air conditioning circulating system 3 can be transferred to the cooling liquid circuit (the first cooling liquid circulating circuit 1 and the second cooling liquid circulating circuit 2), which increases the heat dissipation path and improves the heat exchange capacity and refrigeration efficiency of the air conditioning circulating system 3.

[0089] Under low temperature working conditions, the air conditioning circulating system 3 can absorb environmental heat with the help of the radiator 12.

[0090] The battery pack 21 no longer needs to use the air conditioning heating water circulation for heating, and can directly realize the battery heating function based on the condensation heat release of the air conditioning circulating system 3.

[0091] In the air conditioning cooling mode, the radiator 12 of the cooling liquid circuit can be used to assist the air conditioning circulating system 3 to dissipate heat, and provide the air conditioning refrigeration efficiency and refrigeration capacity; similarly, the radiator 12 can still be used to assist the absorption of environmental heat in the air conditioning cooling mode.

[0092] The use of the air conditioning circulating system 3 can greatly simplify the complexity of the battery thermal management circuit, the same component can realize both battery cooling and heating battery functions, and it is beneficial to transfer the heat of the passenger compartment and the battery pack 21 through the air conditioning circulating system 3, that is, the heat of the battery pack 21 is transferred to the passenger compartment, or the heat of the passenger compartment is transferred to the battery pack 21.​

[0093] The above merely preferred embodiments of the present application, only the technical principles of the present application are described, these descriptions are only to explain the principles of the present application, can not be in any way to limit the scope of protection of the present application. Based on the explanation here, any modification, equivalent replacement and improvement within the spirit and principles of the present application, and the other specific embodiments of the present application which can be conceived by those skilled in the art without creative labor, should be included in the scope of protection of the present application.

Claims

1. A vehicle thermal management system, characterized by, The application relates to a cooling system for an electric vehicle, comprising: a first cooling liquid circulation loop in series with a heat generating component and a heat sink, the heat sink cooling the heat generating component by cooling liquid, the heat generating component comprising at least one or a combination of a motor, a distribution box and a voltage converter; a second cooling liquid circulation loop in series with a battery pack, the second cooling liquid circulation loop cooling or heating the battery pack by cooling liquid; and an air conditioning circulation system connected to the first cooling liquid circulation loop and the second cooling liquid circulation loop respectively and performing heat exchange with the cooling liquid in the first cooling liquid circulation loop and the cooling liquid in the second cooling liquid circulation loop respectively; wherein the first cooling liquid circulation loop is connected to the second cooling liquid circulation loop to perform heat exchange with the second cooling liquid circulation loop by cooling liquid; the air conditioning circulation system has a refrigeration mode and a heating mode; the air conditioning circulation system comprises a first condenser-evaporator and a second condenser-evaporator connected in series to form a closed loop, the first condenser-evaporator is connected to the first cooling liquid circulation loop and located between the heat generating component and the heat sink; the second condenser-evaporator is connected to the second cooling liquid circulation loop and located at a cooling liquid outlet end of the battery pack; the second condenser-evaporator and the first condenser-evaporator have opposite heat transfer modes; the first cooling liquid circulation loop further comprises a first control valve, a second control valve and a third control valve connected in series with the heat generating component and the heat sink; the first condenser-evaporator is connected between the heat generating component and the heat sink; a cooling liquid input end of the heat generating component, a cooling liquid output end of the second condenser-evaporator, a first outlet of the heat sink and a cooling liquid output end of the first condenser-evaporator are connected or disconnected through the first control valve; a second outlet of the heat sink, a cooling liquid input end of the first condenser-evaporator and a cooling liquid input end of the heat generating component are connected or disconnected through the second control valve; a cooling liquid output end of the heat generating component, the second cooling liquid circulation loop, a cooling liquid input end of the first condenser-evaporator and an inlet of the heat sink are connected through the third control valve.

2. A vehicle thermal management system as claimed in claim 1, wherein, The first cooling liquid circulation loop further comprises a water overflow tank and a first electronic water pump, the first electronic water pump is connected to an inlet of the heat sink, and the water overflow tank is connected between the first electronic water pump and the first condenser-evaporator.

3. A vehicle thermal management system as claimed in claim 1 or 2, characterised in that, The second cooling liquid circulation loop further comprises a second electronic water pump and a stop valve connected in series with the battery pack to form a loop, the second electronic water pump is connected to a cooling liquid input end of the second condenser-evaporator, and the stop valve is connected between the battery pack and the second electronic water pump.

4. A vehicle thermal management system as claimed in claim 1 or 2, characterised in that, The first control valve is a three-way valve, and three connection ports of the first control valve are connected with the first outlet of the radiator, the coolant input end of the heat generating component, and the coolant output end of the first condenser evaporator respectively; the second control valve is a three-way valve, and three connection ports of the second control valve are connected with the coolant input end of the first condenser evaporator, the second outlet of the radiator, and the coolant input end of the heat generating component respectively; The third control valve is a four-way valve, and four connection ports of the third control valve are connected with the coolant output end of the heat generating component, the coolant input end of the first condenser evaporator, the inlet of the radiator, and the coolant input end of the second condenser evaporator respectively.

5. A vehicle thermal management control method characterized by, The control method for controlling the vehicle thermal management system as claimed in any one of claims 1-4, the control method comprising: determining whether the passenger cabin has a cooling demand; determining whether the battery pack has a cooling demand; when both the passenger cabin and the battery pack have a cooling demand, controlling the vehicle thermal management system to enter a first mode, the first mode comprising: controlling the first control valve to connect the first outlet of the radiator with the coolant input end of the heat generating component, controlling the second control valve to connect the second outlet of the radiator with the coolant input end of the first condenser evaporator, and controlling the third control valve to connect the coolant output end of the heat generating component with the inlet of the radiator, so as to form a closed loop between the heat generating component and the radiator, and form a closed loop between the first condenser evaporator, the heat generating component, and the radiator, and simultaneously form a closed loop between the battery pack and the second condenser evaporator.

6. A vehicle thermal management control method as claimed in claim 5, characterized in that, The control method further comprises: determining whether the passenger cabin has a heating demand; determining whether the battery pack has a heating demand; when both the passenger cabin and the battery pack have a heating demand, controlling the vehicle thermal management system to enter a second mode, the second mode comprising: controlling the first control valve to connect the coolant output end of the first condenser evaporator with the coolant input end of the heat generating component, controlling the second control valve to be closed, and controlling the third control valve to connect the coolant output end of the heat generating component with the coolant input end of the first condenser evaporator, so as to form a closed loop between the heat generating component and the first condenser evaporator in series, and simultaneously form a closed loop between the battery pack and the second condenser evaporator.

7. A vehicle thermal management control method according to claim 6, characterized in that, when the vehicle management system is in the second mode, and when the temperature of the coolant output end of the first condenser evaporator is lower than the ambient temperature, controlling the first control valve to be closed, connecting the coolant output end of the first condenser evaporator with the inlet of the radiator, controlling the second control valve to connect the coolant input end of the heat generating component with the second outlet of the radiator, so as to form a closed loop between the heat generating component, the first condenser evaporator, and the radiator in series.

8. The vehicle thermal management control method of claim 6, wherein, The control method further comprises: determining whether the battery pack has a heating demand; When the battery pack has a heating requirement, the vehicle thermal management system is controlled to enter a third mode, the third mode comprising: the first cooling liquid circulation loop being in communication with the second cooling liquid circulation loop, the second control valve being controlled to be closed, the second condensing evaporator cooling liquid output end being controlled to be in communication with the cooling liquid input end of the heat generating component through the first control valve, so that the second condensing evaporator and the heat generating component are connected in series to form a closed loop; the cooling liquid output end of the heat generating component being controlled to be in communication with the cooling liquid input end of the second condensing evaporator through the third control valve, so that the second condensing evaporator and the battery are connected in series to form a closed loop, and the heat generating component is arranged in parallel with the battery pack.

9. A vehicle characterized by comprising: A vehicle thermal management system comprising any one of claims 1-4.

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