Integrated thermal management system of electric automobile

Abstract

The utility model belongs to the technical field of automobile heat management, and relates to an electric automobile integrated heat management system which comprises a refrigerant loop and a cooling liquid loop, and the refrigerant loop comprises a first refrigerant loop, a second refrigerant loop, a third refrigerant loop and a fourth refrigerant loop. The cooling liquid loop comprises a first cooling liquid loop, a second cooling liquid loop and a third cooling liquid loop. According to the utility model, through mutual correlation coupling of the refrigerant loop and the cooling liquid loop, waste heat of equipment such as a motor is fully utilized, different function scenes of independent or mutual correlation operation of passenger compartment heat management, battery heat management and motor heat management can be realized, the cooling and heating function requirements of the heat management system are met, and the function application scenes are comprehensive; the problem that the balance among the driving range, comfort and safety of the electric vehicle in the actual environment cannot be well achieved due to the fact that the existing whole vehicle thermal management function scenes are relatively few is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile thermal management technology relates to an integrated type thermal management system of electric automobile. BACKGROUND

[0002] For electric automobile, thermal management system not only influences passenger car driving comfort, but also involves safety and energy consumption problem, how to realize the balance between the range, comfort and safety of electric automobile in actual environment, is the problem that electric automobile thermal management system design needs to solve urgently.

[0003] At present, the cost of electric automobile thermal management system architecture is high, and the function scene is not comprehensive, mainly in the control cost is too large, the part type is too much, the part maintenance replacement difficulty is bigger, the part state is difficult and the whole vehicle thermal management function scene is relatively less, can not goodly realize the balance between the range, comfort and safety of electric automobile in actual environment, also in the relatively more parts used in the whole system and the relatively large space occupied. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides an integrated type thermal management system of electric automobile, through the mutual correlation coupling of refrigerant circuit and coolant circuit, makes full use of the waste heat of motor and other equipment, can realize the different function scenes of passenger compartment thermal management, battery thermal management and motor thermal management independent or mutual correlation operation, reaches the cooling and heating function demand of thermal management system, and the function application scene is comprehensive, so as to solve the problem that the whole vehicle thermal management function scene is relatively less, can not goodly realize the balance between the range, comfort and safety of electric automobile in actual environment.

[0005] In order to achieve the above object, the utility model provides the following technical scheme:

[0006] An integrated type thermal management system of electric automobile, including refrigerant circuit and coolant circuit, the refrigerant circuit includes first refrigerant circuit, second refrigerant circuit, third refrigerant circuit and fourth refrigerant circuit, the coolant circuit includes first coolant circuit, second coolant circuit and third coolant circuit;

[0007] The first refrigerant circuit comprises a compressor, a first electromagnetic valve, an external condenser, a first check valve, a liquid accumulator, a first electronic expansion valve, an evaporator and a third check valve connected in series along a refrigerant flow direction, the second refrigerant circuit comprises the compressor, the first electromagnetic valve, the external condenser, the first check valve, the liquid accumulator, a third electronic expansion valve and a battery cooler connected in series along the refrigerant flow direction, the third refrigerant circuit comprises the compressor, a first full-pass electronic expansion valve, an internal condenser, a second check valve, the liquid accumulator, a second electronic expansion valve, the external condenser and a second electromagnetic valve connected in series along the refrigerant flow direction, and the fourth refrigerant circuit comprises the compressor, the first full-pass electronic expansion valve, the internal condenser, the second check valve, the liquid accumulator, the third electronic expansion valve and the battery cooler connected in series along the refrigerant flow direction;

[0008] The first cooling liquid circuit comprises a motor water pump, a low-temperature radiator, a second three-way valve and a motor connected in series along a cooling liquid flow direction, the second cooling liquid circuit comprises a battery water pump, a battery pack, a first three-way valve, a battery cooler and a water heating PTC connected in series along the cooling liquid flow direction, the third cooling liquid circuit comprises the battery water pump, the battery pack, the first three-way valve, the battery cooler and the water heating PTC connected in series along the cooling liquid flow direction, and the third cooling liquid circuit further comprises the motor water pump, the first three-way valve, the battery cooler, the second three-way valve and the motor connected in series along the cooling liquid flow direction;

[0009] The battery cooler has a cooling liquid channel and a refrigerant channel which exchange heat with each other, the battery cooler is connected in series in the second refrigerant circuit and the fourth refrigerant circuit through the refrigerant channel, and the battery cooler is connected in series in the second cooling liquid circuit and the third cooling liquid circuit through the cooling liquid channel.

[0010] Further, an outlet of the compressor is connected to the first full-pass electronic expansion valve and the first electromagnetic valve through refrigerant pipelines respectively, one end of the first electromagnetic valve is connected to the external condenser through a refrigerant pipeline, the other end of the external condenser is connected to the first check valve and the second electronic expansion valve respectively, an outlet of the first check valve is connected to the liquid accumulator, the liquid accumulator is connected to the third electronic expansion valve and the first electronic expansion valve respectively, the first electronic expansion valve is connected to the evaporator and the third check valve in sequence along the refrigerant flow direction, the third check valve is connected to the inlet of the compressor respectively, the first full-pass electronic expansion valve is connected to the internal condenser, the second check valve and the liquid accumulator in sequence along the refrigerant flow direction, the first electromagnetic valve is further connected to the second electromagnetic valve through a refrigerant pipeline, and the two ends of the second electromagnetic valve are connected to the inlet of the compressor and the end of the external condenser away from the second electronic expansion valve respectively;

[0011] The two ends of the refrigerant passage in the battery cooler are connected with a third throttling electronic expansion valve and an inlet of the compressor respectively to form the first refrigerant circuit, the second refrigerant circuit, the third refrigerant circuit and the fourth refrigerant circuit.

[0012] Further, the outlet of the compressor is also connected with the second full-through electronic expansion valve through a refrigerant pipeline, and the second full-through electronic expansion valve is connected with the inlet of the compressor through a refrigerant pipeline.

[0013] Further, the two ends of the coolant passage in the battery cooler are connected with a first interface of a first three-way valve and a second interface of a second three-way valve respectively, the second interface of the first three-way valve is connected with a battery pack, the third interface is connected with an electric machine water pump and one end of a low-temperature radiator respectively, the other end of the low-temperature radiator is connected with a third interface of the second three-way valve, one end of the battery pack away from the second interface of the first three-way valve is connected with a battery water pump and a water heating PTC in sequence, the water heating PTC is connected with one end of the coolant passage in the battery cooler close to the second interface of the second three-way valve, and the first interface of the second three-way valve is connected with an electric machine and the electric machine water pump in sequence along the flow direction of the coolant to form the first coolant circuit, the second coolant circuit and the third coolant circuit.

[0014] Further, the external condenser and the low-temperature radiator are arranged adjacently, and an electronic fan is arranged on the same side of the external condenser and the low-temperature radiator, and the low-temperature radiator is arranged on the side of the external condenser close to the electronic fan to dissipate heat.

[0015] Further, temperature and pressure sensors are arranged at the two ends of the compressor to monitor the temperature and pressure of the refrigerant at the inlet and outlet of the compressor.

[0016] Further, temperature sensors are arranged at the two ends of the electric machine to monitor the temperature of the coolant at the inlet and outlet of the electric machine.

[0017] The electric vehicle integrated heat management system has the advantages that:

[0018] The electric vehicle integrated heat management system has the advantages that:

[0019] The water heating PTC outputs hot water to heat the battery pack, and the battery cooler acts as an evaporator in the refrigerant circuit, so that the refrigerant circuit and the coolant circuit are coupled, the temperature of the coolant entering the battery pack is reduced, the battery pack is cooled, the waste heat of the motor and other heat generating components is fully utilized, the passenger cabin thermal management, battery thermal management and motor thermal management are independently or mutually associated to realize different function scenes, the cooling and heating function requirements of the thermal management system are met, the function application scene of the thermal management system is comprehensive, the cost is low, and the system is simple and convenient to control.

[0020] Other advantages, objects, and features of the present application will be apparent to those skilled in the art upon reading the following specification, and will be learned from the practice of the present application. The objects and other advantages of the present application can be realized and obtained by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the preferred detailed description of the present application will be combined with the drawings as follows, wherein:

[0022] Figure 1 Structure diagram of an integrated thermal management system of an electric vehicle in an embodiment;

[0023] Figure 2 Structure diagram of a first refrigerant circuit in an embodiment;

[0024] Figure 3 Structure diagram of a second refrigerant circuit in an embodiment;

[0025] Figure 4 Structure diagram of a third refrigerant circuit in an embodiment;

[0026] Figure 5 Structure diagram of a fourth refrigerant circuit in an embodiment;

[0027] Figure 6 Structure diagram of a first coolant circuit in an embodiment;

[0028] Figure 7 Structure diagram of a second coolant circuit in an embodiment;

[0029] Figure 8 Structure diagram of a third coolant circuit in an embodiment;

[0030] Figure 9 Principle diagram of a passenger cabin cooling mode in an embodiment;

[0031] Figure 10A schematic diagram of the principle of the first heating mode of the passenger compartment in the embodiment;

[0032] Figure 11 A schematic diagram of the principle of the second heating mode of the passenger compartment in the embodiment;

[0033] Figure 12 A schematic diagram of the principle of the battery self-circulation mode in the embodiment;

[0034] Figure 13 A schematic diagram of the principle of the battery cooling mode in the embodiment;

[0035] Figure 14 A schematic diagram of the principle of the battery heating mode in the embodiment;

[0036] Figure 15 A schematic diagram of the principle of the battery waste heat heating mode in the embodiment;

[0037] Figure 16 A schematic diagram of the principle of the motor self-circulation mode in the embodiment.

[0038] The reference signs: compressor 1, external condenser 2, first throttling electronic expansion valve 3, evaporator 4, internal condenser 5, second throttling electronic expansion valve 6, third throttling electronic expansion valve 7, first full-pass electronic expansion valve 8, second full-pass electronic expansion valve 9, first electromagnetic valve 10, second electromagnetic valve 11, first one-way valve 12, second one-way valve 13, third one-way valve 14, first three-way valve 15, second three-way valve 16, battery pack 17, battery water pump 18, water heating PTC 19, battery cooler 20, motor water pump 21, motor 22, low-temperature radiator 23, electronic fan 24, liquid storage tank 25. DETAILED DESCRIPTION

[0039] The embodiments of the present application will be described in detail with specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied in different specific embodiments, and various modifications or changes can be made based on different views and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and the features in the following embodiments and examples can be combined with each other without conflict.

[0040] The drawings are only used for illustrative explanation, and the representation is only a schematic diagram, not a physical drawing, and cannot be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings may be omitted.

[0041] The same or similar reference signs in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation and be operated, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration and cannot be understood as a limitation on the present application, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0042] Please refer to Figures 1-8 It is an integrated thermal management system for an electric vehicle, comprising a refrigerant circuit and a coolant circuit, wherein the refrigerant circuit is provided with refrigerant, and the coolant circuit is provided with coolant, and the coolant circuit is coupled with other subsystem circuits through a proportional three-way valve, so that the battery circuit and the motor circuit are associated and controlled with each other, to realize independent or interrelated operation of different function scene modes for passenger cabin thermal management, battery thermal management and motor thermal management, and to achieve the cooling and heating function requirements of the thermal management system.

[0043] The refrigerant circuit comprises a compressor 1, an external condenser 2, a liquid storage tank 25, a first throttling electronic expansion valve 3, a second throttling electronic expansion valve 6, a third throttling electronic expansion valve 7, a first full-pass electronic expansion valve 8, a second full-pass electronic expansion valve 9, a first electromagnetic valve 10, a second electromagnetic valve 11, a first one-way valve 12, a second one-way valve 13, a third one-way valve 14, an evaporator 4 arranged in an air conditioner box and an internal condenser 5, and the outlet of the compressor 1 is connected with the first full-pass electronic expansion valve 8, the second full-pass electronic expansion valve 9 and the first electromagnetic valve 10 through refrigerant pipelines respectively;

[0044] One end of the first electromagnetic valve 10 is connected with the external condenser 2 through a refrigerant pipeline, the other end of the external condenser 2 is connected with the first one-way valve 12 and the second throttling electronic expansion valve 6 respectively, the outlet of the first one-way valve 12 is connected with the liquid storage tank 25, the liquid storage tank 25 is connected with the third throttling electronic expansion valve 7 and the first throttling electronic expansion valve 3 respectively, the first throttling electronic expansion valve 3 is connected with the evaporator 4 and the third one-way valve 14 in sequence along the refrigerant flow direction, and the third one-way valve 14 is connected with the inlet of the compressor 1 and the refrigerant channel of the battery cooler 20 respectively;

[0045] The first full-pass electronic expansion valve 8 is connected with the built-in condenser 5, the second one-way valve 13 and the liquid storage tank 25 in sequence along the direction of refrigerant flow; the first electromagnetic valve 10 is further connected with the second electromagnetic valve 11 through a refrigerant pipeline, and the second electromagnetic valve 11 and the second full-pass electronic expansion valve 9 are connected to the inlet of the compressor 1;

[0046] The second throttling electronic expansion valve 6 is connected with the third throttling electronic expansion valve 7 and the first throttling electronic expansion valve 3 respectively, and the two ends of the refrigerant passage in the battery cooler 20 are connected with the outlet of the third throttling electronic expansion valve 7 and the third one-way valve 14 respectively, and the end close to the third one-way valve 14 is further connected with the inlet of the compressor.

[0047] The cooling liquid circuit comprises a first three-way valve 15, a second three-way valve 16, a battery pack 17 (referring to the cooling liquid pipeline in the battery pack 17), a battery water pump 18, a water heating PTC 19, a battery cooler 20, a motor water pump 21, a motor 22 (referring to the cooling liquid pipeline in the motor 22) and a low-temperature radiator 23; the two ends of the cooling liquid passage in the battery cooler 20 are connected with the first interface of the first three-way valve 15 and the second interface of the second three-way valve 16 respectively, and the second interface of the first three-way valve 15 is connected with the battery pack 17; the third interface of the first three-way valve 15 is connected with one end of the motor water pump 21 and one end of the low-temperature radiator 23 respectively, and one end of the low-temperature radiator 23 is connected with the third interface of the second three-way valve 16; the end of the battery pack 17 away from the second interface of the first three-way valve 15 is connected with the battery water pump 18, the water heating PTC 19 and the end of the cooling liquid passage in the battery cooler 20 close to the second interface of the second three-way valve 16 in sequence; the first interface of the second three-way valve 16 is connected with the motor 22 and the motor water pump 21 in sequence along the direction of cooling liquid flow.

[0048] Further, the external condenser 2 and the low-temperature radiator 23 are arranged adjacently, and an electronic fan 24 is arranged on the same side of the external condenser 2 and the low-temperature radiator 23, and the low-temperature radiator is arranged on the side of the external condenser close to the electronic fan to dissipate heat.

[0049] Specifically, temperature and pressure sensors are arranged at the two ends of the compressor to monitor the temperature and pressure of the refrigerant at the inlet and outlet of the compressor; temperature sensors are arranged at the two ends of the motor to monitor the temperature of the cooling liquid at the inlet and outlet of the motor.

[0050] The key of the embodiment is that the refrigerant circuit comprises a first refrigerant circuit, a second refrigerant circuit, a third refrigerant circuit and a fourth refrigerant circuit, and the cooling liquid circuit comprises a first cooling liquid circuit, a second cooling liquid circuit and a third cooling liquid circuit;

[0051] As Figure 2As shown, the first refrigerant circuit includes a compressor 1, a first solenoid valve 10, an external condenser 2, a first check valve 12, a liquid receiver 25, a first throttling electronic expansion valve 3, an evaporator 4, and a third check valve 14, which are connected in series along the refrigerant flow direction.

[0052] like Figure 3 As shown, the second refrigerant circuit includes a compressor 1, a first solenoid valve 10, an external condenser 2, a first check valve 12, a liquid receiver 25, a third throttling electronic expansion valve 7, and a battery cooler 20, which are connected in series along the refrigerant flow direction.

[0053] like Figure 4 As shown, the third refrigerant circuit includes a compressor 1, a first full-way electronic expansion valve 8, a built-in condenser 5, a second one-way valve 13, a liquid receiver 25, a second throttling electronic expansion valve 6, an external condenser 2, and a second solenoid valve 11, which are connected in series along the refrigerant flow direction.

[0054] like Figure 5 As shown, the fourth refrigerant circuit includes a compressor 1, a first full-pass electronic expansion valve 8, a built-in condenser 5, a second one-way valve 13, a liquid receiver 25, a third throttling electronic expansion valve 7, and a battery cooler 20, which are connected in series along the refrigerant flow direction.

[0055] like Figure 6 As shown, the first coolant circuit includes a motor-driven water pump 21, a low-temperature radiator 23, a second three-way valve 16, and a motor 22, which are connected in series along the coolant flow direction.

[0056] like Figure 7 As shown, the second coolant circuit includes a battery water pump 18, a battery pack 17, a first three-way valve 15, a coolant passage for a battery cooler 20, and a water heater PTC 19, which are connected in series along the coolant flow direction.

[0057] like Figure 8 As shown, the third coolant circuit includes a battery water pump 18, a battery pack 17, a first three-way valve 15, a coolant channel of a battery cooler 20, and a water heater PTC 19, which are connected in series along the coolant flow direction. It also includes a motor water pump 21, a first three-way valve 15, a battery cooler 20, a second three-way valve 16, and a motor 22, which are connected in series along the coolant flow direction.

[0058] The first port of the first three-way valve 15 is connected to the coolant channel outlet of the battery cooler 20, the second port is connected to the battery pack 17, and the third port is connected to the motor water pump 21.

[0059] In this embodiment, the water heating PTC 19 outputs hot water to heat the battery pack 17, and the chiller (battery cooler 20) acts as an evaporator in the refrigerant circuit to achieve coupling of the refrigerant circuit and the coolant circuit, thereby reducing the temperature of the coolant entering the battery pack, and further achieving cooling of the battery pack.

[0060] The function application scenarios of the thermal management system include passenger cabin thermal management, battery thermal management, and motor thermal management.

[0061] I. The passenger cabin thermal management includes a passenger cabin cooling mode, a passenger cabin heating mode, and a passenger cabin refrigeration defogging mode. The passenger cabin heating mode includes a first passenger cabin heating mode and a second passenger cabin heating mode. The specific control method is as follows:

[0062] 1. Passenger cabin cooling mode:

[0063] When the ambient temperature is high and the passenger cabin has cooling demand, the passenger cabin thermal management enters the passenger cabin cooling mode. The working process is as shown in Figure 9 .

[0064] After the refrigerant is compressed by the compressor 1, it enters the external condenser 2 for condensation and heat release. After expansion through the first electronic expansion valve 3, it enters the evaporator 4 for evaporation and heat absorption, so that cold air enters the passenger cabin, thereby achieving cooling. The refrigerant finally returns to the compressor 1, i.e., the first refrigerant circuit is opened.

[0065] 2. Passenger cabin heating mode:

[0066] When the ambient temperature is low and the passenger cabin has heating demand, the passenger cabin thermal management enters the passenger cabin heating mode. According to different ambient temperatures and waste heat, the passenger cabin heating mode has two modes, namely, air source heat pump and water source heat pump. Their working processes are as shown in Figure 10 , Figure 11 .

[0067] a. The first heating mode of the passenger cabin is as follows: when the passenger cabin has heating demand, the third refrigerant circuit is opened. After the refrigerant is compressed by the compressor 1, it enters the built-in condenser 5 for condensation and heat release, so that hot air enters the passenger cabin, thereby achieving temperature rise. After expansion through the second electronic expansion valve 6, it passes through the external condenser 2 and the second electromagnetic valve 11 to return to the compressor 1, so that the refrigerant circulates in the third refrigerant circuit. In the low-temperature working condition, the cold start can use motor locked-rotor heat, i.e., the first coolant circuit is opened.

[0068] as shown in Figure 10 .

[0069] b. The second heating mode of the passenger compartment is: when the passenger compartment has heating demand, the fourth refrigerant circuit and the second coolant circuit (using PTC heating) or the third coolant circuit (using motor waste heat) are turned on, as shown in Figure 11 ; The refrigerant in the fourth refrigerant circuit is condensed in the built-in condenser 5 to release heat to the passenger compartment, thereby heating the passenger compartment.

[0070] Specifically, at this time, the compressor 1 works, and the heat exchange between the refrigerant and the coolant in the battery cooler 20 forms a water source heat pump heating mode; when the second coolant circuit and the fourth refrigerant circuit are turned on alone, the coolant is heated by the water heating PTC 19 and exchanges heat with the refrigerant in the battery cooler 20; when the third coolant circuit and the fourth refrigerant circuit are turned on, the second coolant circuit is actually turned on synchronously, and in this case, the waste heat of the motor 22 can also be utilized.

[0071] 3. Passenger compartment defogging mode:

[0072] When the passenger compartment glass fogs, the passenger compartment glass needs to be defogged, and the passenger compartment thermal management enters the passenger compartment defogging mode, which has two modes:

[0073] a. Passenger compartment cooling defogging mode

[0074] When the passenger compartment glass needs to be defogged in spring and autumn, the passenger compartment thermal management enters the passenger compartment cooling defogging mode, which has the same principle as the passenger compartment cooling mode, and the working process is as shown in Figure 9 . After the refrigerant is compressed by the compressor, it is condensed in the external condenser to release heat, and then expanded through the first throttling electronic expansion valve, and then evaporated in the evaporator to absorb heat. The air flow in the passenger compartment passes through the surface of the evaporator to be cooled and dehumidified, thereby achieving the effect of defogging the passenger compartment, and the refrigerant finally returns to the compressor.

[0075] b. Passenger compartment heat pump defogging mode

[0076] When the passenger compartment needs to be heated in winter and the glass needs to be defogged, the passenger compartment thermal management enters the passenger compartment heat pump defogging mode, which has the same principle as the first heating mode of the passenger compartment, and the working process is as shown in Figure 10 . After the refrigerant is compressed by the compressor, it is condensed in the built-in condenser to release heat, and the hot air enters the passenger compartment to raise the temperature of the glass, thereby achieving the purpose of defogging. The refrigerant finally returns to the compressor.

[0077] II. Battery thermal management includes battery self-circulation, battery cooling, battery heating, and battery waste heat heating mode;

[0078] 1. Battery self-circulation mode:

[0079] When the battery has no cooling and heating requirements, in order to ensure the battery temperature uniformity (temperature difference exceeds a certain range), the battery thermal management enters the battery self-circulation mode, the second cooling liquid circuit is opened, and the working process is as shown in Figure 12 The battery water pump 18 is opened, the cooling liquid circulates in the second cooling liquid circuit, at this time the water heating PTC 19 does not work, and the battery cooler 20 does not exchange heating and cooling heat.

[0080] 2. Battery cooling mode:

[0081] When the internal temperature of the battery pack 17 is high and reaches a certain temperature, in order to ensure the service life and safety of the battery, the battery control system issues a cooling requirement, the battery thermal management enters the battery cooling mode, the second refrigerant circuit and the second cooling liquid circuit are opened, and the working process is as shown in Figure 13 .

[0082] The refrigerant is compressed by the compressor 1, enters the external condenser 2 to condense and release heat, and then expands through the third throttling electronic expansion valve 7, enters the Chiller (battery cooler 20) to evaporate and absorb heat, so as to absorb the heat of the cooling liquid in the second cooling liquid circuit, achieve the purpose of cooling the cooling liquid, and the cooled cooling liquid enters the battery pack 17 (at this time the refrigerant is coupled through the battery cooler 20 and the cooling liquid of the second cooling liquid circuit) to reduce the water temperature of the second cooling liquid circuit, thereby realizing battery pack cooling, and the refrigerant finally returns to the compressor 1.

[0083] 3. Battery heating mode:

[0084] When the ambient temperature is low and the battery is in a low temperature state, the battery heat is insufficient to ensure the highest efficiency of the battery, the battery charging and discharging power is limited, and the vehicle charging speed and endurance performance are affected. In order to ensure the normal work of the battery system, the battery control system issues a heating requirement, the battery thermal management enters the battery heating mode, the second cooling liquid circuit is opened, and the cooling liquid circulates in the second cooling liquid circuit, as shown in Figure 14 At this time, the battery water pump 18 is opened, the water heating PTC 19 works, and the battery cooler 20 does not exchange heating and cooling heat, so that the cooling liquid heated by the water heating PTC 19 is all used for exchange heating of the battery pack.

[0085] 4. Battery waste heat heating mode:

[0086] When the battery has heating requirements, the third cooling liquid circuit is opened, and the cooling liquid circulates in the third cooling liquid circuit, as shown in Figure 15The cooling liquid in the third cooling liquid circuit flows through the cooling liquid flow channel in the motor 22, absorbs the heat of the motor 22, and after absorbing the heat, flows through the battery pack 17 to heat the battery pack, so as to heat the battery pack 17 by the waste heat of the motor 22; in this mode, the battery water pump 18 and the motor water pump 21 are turned on, and the water heating PTC 19 is not working, at this time, the battery cooler 20 does not perform heating and cooling heat exchange.

[0087] In another embodiment, if the motor waste heat is not enough to heat the battery pack, the water heating PTC 19 can also be turned on to heat the cooling liquid.

[0088] III. Motor thermal management includes motor self-circulation and motor radiator cooling mode;

[0089] 1. Motor self-circulation mode:

[0090] When the ambient temperature is low and the vehicle is cold started, the motor temperature itself is low, the motor thermal management enters the motor self-circulation mode, the first cooling liquid circuit is turned on, the motor water pump 21 is turned on, and the cooling liquid circulates in the first cooling liquid circuit, and the working process is as shown in Figure 16 The cooling liquid in the first cooling liquid circuit can be heated by the heat generated by each component in the first cooling liquid circuit, the first cooling liquid circuit does not exchange heat with other circuits, and the electronic fan 24 does not work, so that the first cooling liquid circuit can quickly reach the appropriate working temperature.

[0091] 2. Motor radiator cooling mode:

[0092] When the motor temperature is high and the motor has cooling demand, and the motor waste heat is not effectively utilized, the motor thermal management enters the motor radiator cooling mode, the first cooling liquid circuit is turned on, and the working process is as shown in Figure 16 In this mode, the motor water pump 21 is turned on to make the cooling liquid flow through the low-temperature radiator 23, and the electronic fan 24 is turned on (the electronic fan blows air through the low-temperature radiator 23 to heat the ambient air), so as to cool the cooling liquid in the first cooling liquid circuit through the low-temperature radiator, and then cool the motor.

[0093] The integrated thermal management system of the electric vehicle in the embodiment is independent between the circuits in structure, which is convenient for modular design, and is also convenient for early assembly and integration of the thermal management system in the vehicle assembly process; then the cooling liquid circuit and the refrigerant circuit are coupled through the battery cooler, and the waste heat of the motor and other heat generating components is fully utilized, so that the passenger compartment thermal management, the battery thermal management, and the motor thermal management can be independently or mutually associated to operate different function scenes, to meet the cooling and heating function requirements of the thermal management system, and the function application scene of the thermal management system is comprehensive, the cost is low, and the system is simple and convenient to control.

[0094] Finally, it is explained that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. An integrated thermal management system for an electric vehicle, the system comprising: The refrigerant circuit comprises a first refrigerant circuit, a second refrigerant circuit, a third refrigerant circuit and a fourth refrigerant circuit, and the coolant circuit comprises a first coolant circuit, a second coolant circuit and a third coolant circuit; The first refrigerant circuit comprises a compressor, a first electromagnetic valve, an external condenser, a first check valve, a liquid storage tank, a first electronic expansion valve, an evaporator and a third check valve connected in series along a refrigerant flow direction, the second refrigerant circuit comprises the compressor, the first electromagnetic valve, the external condenser, the first check valve, the liquid storage tank, a third electronic expansion valve and a battery cooler connected in series along the refrigerant flow direction, the third refrigerant circuit comprises the compressor, a first full-pass electronic expansion valve, an internal condenser, a second check valve, the liquid storage tank, a second electronic expansion valve, the external condenser and a second electromagnetic valve connected in series along the refrigerant flow direction, and the fourth refrigerant circuit comprises the compressor, the first full-pass electronic expansion valve, the internal condenser, the second check valve, the liquid storage tank, the third electronic expansion valve and the battery cooler connected in series along the refrigerant flow direction; The first coolant circuit comprises a motor water pump, a low-temperature radiator, a second three-way valve and a motor connected in series along a coolant flow direction, the second coolant circuit comprises a battery water pump, a battery pack, a first three-way valve, a battery cooler and a water heating PTC connected in series along the coolant flow direction, the third coolant circuit comprises the battery water pump, the battery pack, the first three-way valve, the battery cooler and the water heating PTC connected in series along the coolant flow direction, and the third coolant circuit further comprises the motor water pump, the first three-way valve, the battery cooler, the second three-way valve and the motor connected in series along the coolant flow direction; The battery cooler has a coolant passage and a refrigerant passage which exchange heat with each other, the battery cooler is connected in series in the second refrigerant circuit and the fourth refrigerant circuit through the refrigerant passage, and the battery cooler is connected in series in the second coolant circuit and the third coolant circuit through the coolant passage.

2. The integrated thermal management system for electric vehicles of claim 1, wherein: An outlet of the compressor is connected to the first full-pass electronic expansion valve and the first electromagnetic valve through refrigerant pipelines, one end of the first electromagnetic valve is connected to the external condenser through a refrigerant pipeline, the other end of the external condenser is connected to the first check valve and the second electronic expansion valve, an outlet of the first check valve is connected to the liquid storage tank, the liquid storage tank is connected to the third electronic expansion valve and the first electronic expansion valve, the first electronic expansion valve is connected to the evaporator and the third check valve in sequence along the refrigerant flow direction, the third check valve is connected to an inlet of the compressor, the first full-pass electronic expansion valve is connected to the internal condenser, the second check valve and the liquid storage tank in sequence along the refrigerant flow direction, the first electromagnetic valve is further connected to the second electromagnetic valve through a refrigerant pipeline, and two ends of the second electromagnetic valve are connected to an inlet of the compressor and an end of the external condenser away from the second electronic expansion valve. Two ends of the refrigerant passage in the battery cooler are connected with a third throttling electronic expansion valve and an inlet of the compressor respectively to form the first refrigerant circuit, the second refrigerant circuit, the third refrigerant circuit and the fourth refrigerant circuit.

3. The integrated thermal management system for electric vehicles of claim 2, wherein: An outlet of the compressor is also connected with a second full-through electronic expansion valve through a refrigerant pipeline, and the second full-through electronic expansion valve is connected with an inlet of the compressor through a refrigerant pipeline.

4. The integrated thermal management system for electric vehicles of claim 1, wherein: Two ends of the coolant passage in the battery cooler are connected with a first interface of a first three-way valve and a second interface of a second three-way valve respectively, a second interface of the first three-way valve is connected with a battery pack, a third interface is connected with an electric machine water pump and one end of a low-temperature radiator respectively, the other end of the low-temperature radiator is connected with a third interface of the second three-way valve, one end of the battery pack away from the second interface of the first three-way valve is connected with a battery water pump and a water heating PTC in sequence, the water heating PTC is connected with one end of the coolant passage in the battery cooler close to the second interface of the second three-way valve, and a first interface of the second three-way valve is connected with an electric machine and the electric machine water pump in sequence along a coolant flow direction to form the first coolant circuit, the second coolant circuit and the third coolant circuit.

5. The integrated thermal management system for electric vehicles of claim 1, wherein: The external condenser and the low-temperature radiator are arranged adjacently, and an electronic fan is arranged on the same side of the external condenser and the low-temperature radiator, and the low-temperature radiator is arranged on a side of the external condenser close to the electronic fan to dissipate heat.

6. The integrated thermal management system for electric vehicles of claim 1, wherein: Temperature and pressure sensors are arranged at two ends of the compressor to monitor temperatures and pressures of refrigerants at inlets and outlets of the compressor.

7. The integrated thermal management system for electric vehicles of claim 1, wherein: Temperature sensors are arranged at two ends of the electric machine to monitor temperatures of coolants at inlets and outlets of the electric machine.

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