CN118238583A

CN118238583A - Electric automobile thermal management system and method

Info

Publication number: CN118238583A
Application number: CN202410569552.8A
Authority: CN
Inventors: 王俊明; 邢志海; 刘晓俊
Original assignee: Ecarx Hubei Tech Co Ltd
Current assignee: Ecarx Hubei Tech Co Ltd
Priority date: 2024-05-09
Filing date: 2024-05-09
Publication date: 2024-06-25

Abstract

The embodiment of the invention provides a thermal management system and a thermal management method for an electric automobile. The system comprises: a refrigerant loop, a cooling liquid loop and an air conditioning box; the refrigerant loop sequentially comprises a compressor, a water-cooled condenser, an electronic expansion valve of the passenger cabin, an evaporator and a gas-liquid separator; the cooling liquid loop comprises a motor loop and a battery loop, and the motor loop and the battery loop are connected through a four-way electromagnetic valve; the motor loop sequentially comprises an expansion kettle, a motor water pump, a second electromagnetic three-way valve, a four-way electromagnetic expansion valve, a water-cooling condenser and a first electromagnetic three-way valve; the battery loop sequentially comprises the four-way electromagnetic expansion valve, a battery cooling plate and a battery water pump; the air conditioner case comprises a warm air core body, a warm air PTC, an evaporator and a blower, wherein the warm air core body is connected with the first electromagnetic three-way valve and the water-cooled condenser. The embodiment of the invention increases the low-power air heating PTC, does not need the high-power water heating PTC, reduces the power consumption of the whole vehicle, and meets the requirements of rapid heating of the passenger cabin and battery heating at low temperature.

Description

Electric automobile thermal management system and method

Technical Field

The invention relates to the technical field of automobile system design, in particular to an electric automobile thermal management system and an electric automobile thermal management method.

Background

The new energy pure electric automobile can not use the waste heat of the engine to heat the passenger cabin, and the low-temperature characteristic of the battery is poor, the normal charge and discharge requirements can not be met, the heating requirements exist, the whole automobile heating requirements are generally met through a heat pump air conditioner and a water heating PTC (Positive Temperature Coefficient, positive temperature coefficient, widely indicated by semiconductor materials or components with very large positive temperature coefficient), however, the heating efficiency of the water heating PTC is lower than 1, the power consumption is high when the water heating PTC is started, and the cruising mileage is seriously influenced. And R134a (tetrafluoroethane) refrigerant is conventionally used in the heat pump air conditioner, and the heating capacity is limited by the thermal property of the refrigerant under the low-temperature working condition (-10 ℃) and the heating requirement of the whole vehicle cannot be met because the evaporation pressure required by the hardware protection of the compressor is more than 1bar, and the temperature difference between the gaseous saturated temperature corresponding to the R134a at the pressure of 1bar and the environment is smaller, so that the heat cannot be absorbed from the low-temperature environment.

With the popularization of pure electric vehicles, users have increasingly higher requirements on the endurance mileage of the electric vehicles, various heat pump systems are generated, and the direct heat pump system heats the passenger cabin through internal cooling, and an evaporator in an air conditioner box cools the passenger cabin.

However, the direct heat pump system has a plurality of heat exchangers, so that the refrigerant loop mode is more, the pipelines are complex, the cost is higher, and the direct heat pump system needs to be matched with a high-power water heating PTC to meet the requirements of passenger cabin and battery heating at low temperature, so that the electric automobile can continue to run at low temperature and severely attenuate.

Disclosure of Invention

Aiming at the defects in the prior art, the embodiment of the invention provides an electric automobile thermal management system and an electric automobile thermal management method.

In a first aspect, an embodiment of the present invention provides an electric automobile thermal management system, including: a refrigerant loop, a cooling liquid loop and an air conditioning box;

the refrigerant loop sequentially comprises a compressor, a water-cooled condenser, an electronic expansion valve of the passenger cabin, an evaporator and a gas-liquid separator;

The cooling liquid loop comprises a motor loop and a battery loop, and the motor loop and the battery loop are connected through a four-way electromagnetic valve;

the motor loop sequentially comprises an expansion kettle, a motor water pump, a second electromagnetic three-way valve, the four-way electromagnetic expansion valve, the water-cooling condenser and a first electromagnetic three-way valve;

The battery loop sequentially comprises the four-way electromagnetic expansion valve, a battery cooling plate and a battery water pump;

The air conditioner comprises a warm air core body, a warm air PTC, an evaporator and a blower, wherein the warm air core body is connected with the first electromagnetic three-way valve and the water-cooled condenser.

As in the above system, optionally, the air conditioning case further comprises:

a mode damper;

The evaporator and the air heating PTC are connected in series, and the warm air core body, the evaporator and the air heating PTC are arranged side by side and staggered;

The mode air door is arranged between the warm air core body and the evaporator and is used for controlling the airflow circulation relation between the warm air core body and the evaporator.

As in the system above, optionally, the motor circuit further comprises:

The front-end heat dissipation module comprises a front-end radiator and a heat dissipation fan;

the second electromagnetic three-way valve is connected with the front-end radiator and the electric driving module.

As in the above system, optionally, the refrigerant circuit further comprises:

a battery electronic expansion valve and a battery cooler connected with the battery electronic expansion valve;

The battery electronic expansion valve is connected with the water-cooling condenser, and the battery cooler is connected with the gas-liquid separator and the battery cooling plate.

As in the system above, optionally, the electric drive module comprises:

a motor and an electric control.

As in the system above, optionally, the electric drive module further comprises:

And (5) water cooling the parts.

In a second aspect, an embodiment of the present invention provides a thermal management method for an electric vehicle, which is applied to a thermal management system for an electric vehicle, where the thermal management system for an electric vehicle includes: a refrigerant loop, a cooling liquid loop and an air conditioning box; the refrigerant loop sequentially comprises a compressor, a water-cooled condenser, an electronic expansion valve of the passenger cabin, an evaporator and a gas-liquid separator; the cooling liquid loop comprises a motor loop and a battery loop, and the motor loop and the battery loop are connected through a four-way electromagnetic valve; the motor loop sequentially comprises an expansion kettle, a motor water pump, a second electromagnetic three-way valve, the four-way electromagnetic expansion valve, the water-cooling condenser and a first electromagnetic three-way valve; the battery loop sequentially comprises the four-way electromagnetic expansion valve, a battery cooling plate and a battery water pump; the air conditioner comprises a warm air core body, a warm air PTC, the evaporator and a blower, wherein the warm air core body is connected with the first electromagnetic three-way valve and the water-cooled condenser; the method comprises the following steps:

if the fact that the temperature outside the electric automobile is lower than a preset low-temperature threshold value is judged, starting the motor water pump, the battery water pump and the passenger cabin electronic expansion valve;

controlling the four-way electromagnetic valve to enable the motor loop to be communicated with the battery loop;

Controlling the first electromagnetic three-way valve to enable the battery loop to be connected with the warm air core in series;

controlling the blower to blow air into the evaporator;

the air heating PTC is controlled to heat inlet air of the evaporator so as to raise the temperature of air flowing through the warm air core.

As in the above method, optionally, the air conditioning case further comprises: a mode damper; the evaporator and the air heating PTC are connected in series, and the warm air core body, the evaporator and the air heating PTC are arranged side by side and staggered; the mode damper is disposed between the warm air core and the evaporator, the method further comprising:

If judging that the passenger cabin of the electric automobile needs to be heated independently, controlling the four-way electromagnetic valve to be disconnected with the battery loop;

and controlling the mode air door to enable the warm air core body to be connected with the evaporator in parallel.

The method as above, optionally, further comprising:

if judging that the battery of the electric automobile needs to be independently heated, controlling the first electromagnetic three-way valve to disconnect the warm air core body and communicate with the water-cooling condenser;

and controlling the four-way electromagnetic valve to be communicated with the battery loop.

As in the above method, optionally, the motor loop further comprises: the front-end heat dissipation module comprises a front-end radiator and a heat dissipation fan; the second electromagnetic three-way valve connects the front-end radiator and the electric drive module, the method further comprising:

If the difference value between the temperature of the motor body of the electric automobile and the temperature of the cooling liquid is higher than a difference value threshold value, controlling the first electromagnetic three-way valve to be communicated with the warm air core body and disconnected with the water-cooling condenser;

And controlling the second electromagnetic three-way valve to enable the front-end heat radiation module, the electric driving module and the water-cooling condenser to be communicated.

The method as above, optionally, the method further comprises:

if judging that the motor of the electric automobile needs to be cooled, controlling the second electromagnetic three-way valve to be communicated with the front-end heat radiation module;

The first electromagnetic three-way valve is controlled to be communicated with the water-cooled condenser and disconnected with the warm air core;

the four-way electromagnetic valve is controlled to disconnect the battery loop, so that the motor loop is independently circulated;

closing the refrigerant loop and starting the motor water pump;

Starting the cooling fan after the motor water pump reaches the maximum duty ratio;

And controlling the fan duty ratio of the cooling fan according to the outlet water temperature of the front-end radiator.

As in the above method, optionally, the refrigerant circuit further comprises: a battery electronic expansion valve and a battery cooler connected with the battery electronic expansion valve; the battery electronic expansion valve is connected with the water-cooled condenser, the battery cooler is connected with the gas-liquid separator and the battery cooling plate, and the method further comprises:

If judging that the passenger cabin and the battery of the electric automobile need to be cooled, starting the refrigerant loop;

acquiring a difference value between the temperature of the air outlet of the passenger cabin and a target temperature;

Controlling the rotation speed of the compressor according to the difference value;

and controlling the opening degrees of the passenger cabin electronic expansion valve and the battery electronic expansion valve according to the superheat degree of the refrigerant at the inlet of the compressor.

The method as above, optionally, the method further comprises:

and if judging that only the passenger cabin of the electric automobile needs to be cooled, closing the battery electronic expansion valve.

The method as above, optionally, the method further comprises:

and if judging that only the battery of the electric automobile needs to be cooled, closing the passenger cabin electronic expansion valve.

The method as above, optionally, the method further comprises:

acquiring the temperature of a water outlet of the front-end radiator;

After judging that the temperature of the water outlet meets the preset condition, controlling the four-way electromagnetic valve to enable the battery loop and the motor loop to be connected in series;

And closing the refrigerant loop and starting the motor water pump.

The electric automobile thermal management system provided by the embodiment of the invention integrates the thermal management requirements of the passenger cabin and the battery of the whole automobile, increases the low-power air heating PTC, excites the high-pressure side heating capacity of the heat pump system at low temperature, does not need the high-power water heating PTC, reduces the power consumption of the whole automobile, and meets the requirements of rapid heating of the passenger cabin and battery heating at low temperature.

Drawings

FIG. 1 is a block diagram of an embodiment of an electric vehicle thermal management system of the present invention;

FIG. 2 is a block diagram of a hollow box in an embodiment of an electric vehicle thermal management system according to the present invention;

FIG. 3 is a schematic diagram comparing a front-end heat dissipation module with the prior art in an embodiment of an electric vehicle thermal management system according to the present invention;

FIG. 4 is a block diagram of a thermal management system in a battery and passenger compartment heating mode of an electric vehicle in an embodiment of a thermal management method of the present invention;

FIG. 5 is a block diagram of a thermal management system in a passenger compartment mode for independently heating an electric vehicle in an embodiment of a thermal management method for an electric vehicle according to the present invention;

FIG. 6 is a block diagram of a thermal management system in a battery mode for independently heating an electric vehicle in an embodiment of a thermal management method for an electric vehicle according to the present invention;

FIG. 7 is a block diagram of a thermal management system in a motor waste heat utilization mode of an electric vehicle according to an embodiment of the thermal management method of the present invention;

FIG. 8 is a block diagram of a thermal management system in a motor cooling mode of an electric vehicle according to an embodiment of a thermal management method of the present invention;

FIG. 9 is a block diagram of a thermal management system in a cooling mode of a passenger compartment and a battery of an electric vehicle according to an embodiment of a thermal management method of the present invention;

FIG. 10 is a block diagram of a thermal management system in a passenger compartment mode for individually cooling an electric vehicle in an embodiment of a thermal management method for an electric vehicle according to the present invention;

FIG. 11 is a block diagram of a thermal management system in a battery mode for cooling an electric vehicle alone in an embodiment of a method for thermal management of an electric vehicle according to the present invention;

FIG. 12 is a block diagram of a thermal management system in a spring and autumn cooling mode of an electric vehicle according to an embodiment of a thermal management method of the present invention;

Reference numerals illustrate:

1-a compressor; 2-a water-cooled condenser; 3-passenger cabin electronic expansion valve;

4-battery compartment electronic expansion valve; 5-a battery cooler; 6-a blower;

7-an evaporator; 8-air heating PTC; 9-a warm air core;

10-a gas-liquid separator; 11-a first electromagnetic three-way valve; 12-a four-way electromagnetic valve;

13-a motor water pump; 14-a second electromagnetic three-way valve; 15-front-end radiator;

16-an electric drive module; 17-battery water pump; 18-a battery cooling plate;

19-an expansion kettle; 20-a heat radiation fan; 21-mode damper;

100-refrigerant loop; 200-a cooling liquid loop; 300-an air conditioning box;

400-front-end heat dissipation module; 210-motor loop; 220-battery loop.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 1, a block diagram illustrating a thermal management system of an electric vehicle according to an embodiment of the present invention may specifically include:

a refrigerant circuit 100, a coolant circuit 200, and an air conditioning unit 300;

The refrigerant loop 100 sequentially comprises a compressor 1, a water-cooled condenser 2, an electronic expansion valve 3 of a passenger cabin, an evaporator 7 and a gas-liquid separator 10;

The cooling liquid circuit 200 comprises a motor circuit 210 and a battery circuit 220, and the motor circuit 210 and the battery circuit 220 are connected through a four-way electromagnetic valve 12;

the motor loop 210 sequentially comprises an expansion kettle 19, a motor water pump 13, a second electromagnetic three-way valve 14, the four-way electromagnetic expansion valve 12, the water-cooled condenser 2 and a first electromagnetic three-way valve 11;

the battery loop 220 sequentially comprises the four-way electromagnetic expansion valve 12, a battery cooling plate 18 and a battery water pump 17;

The air conditioning box 300 comprises a warm air core 9, a warm air PTC 8, the evaporator 7 and a blower 6, wherein the warm air core 9 is connected with the first electromagnetic three-way valve 11 and the water-cooled condenser 2.

Specifically, in the prior art, a direct heat pump system is used, namely, hot air heated by a passenger cabin is from a heat exchanger taking a refrigerant as a medium, namely, the refrigerant is taken as a heat source, and the hot air is blown through the heat exchanger of the refrigerant through an air conditioner, and after being heated, the temperature of the passenger cabin is raised. However, the direct heat pump system has a plurality of heat exchangers, so that the refrigerant loop mode is more, the pipelines are complex, the cost is higher, and the direct heat pump system needs to be matched with a high-power water heating PTC to meet the requirements of passenger cabin and battery heating at low temperature, so that the electric automobile can continue to run at low temperature and severely attenuate.

In order to solve the problem, in the embodiment of the invention, the high-power water heating PTC is removed, the low-power air heating PTC is added, and an indirect heat pump system is adopted, namely, the heat of the high-temperature refrigerant is firstly exchanged into the cooling liquid without directly blowing through a heat exchanger of the refrigerant by hot air, then the heat of the high-temperature refrigerant is blown through the heat exchanger of the cooling liquid by hot air of an air conditioner, and after heating, the temperature of a passenger cabin is raised, and the heating capacity of the heat pump system is excited at low temperature.

Specifically, as shown in fig. 1, the thermal management system may include: refrigerant circuit 100, coolant circuit 200, and air conditioning unit 300.

The refrigerant circuit 100 sequentially comprises a compressor 1, a water-cooled condenser 2, a passenger cabin electronic expansion valve 3, an evaporator 7 and a gas-liquid separator 10, wherein the water-cooled condenser 2 comprises a refrigerant passage and a cooling liquid passage.

There are typically four processes for a heat pump cycle: adiabatic compression, isothermal condensation, adiabatic expansion, and isothermal evaporation: the compressor 1 heats the refrigerant into high-temperature high-pressure gas by acting, and then condenses the high-temperature high-pressure gas into high-pressure medium-temperature liquid by the water-cooled condenser 2, which is an adiabatic compression to isothermal condensation process, also referred to as a high-pressure side heating process. The high-pressure medium-temperature liquid is expanded adiabatically by the passenger cabin electronic expansion valve 3, the refrigerant is expanded into a low-pressure medium-temperature liquid from the high pressure, and finally cold air is blown out by heat exchange of the evaporator 7, and the process is an adiabatic expansion to isothermal evaporation process, which is also called a low-pressure side heat absorption process.

The cooling liquid circuit 200 includes a motor circuit 210 and a battery circuit 220, and the motor circuit 210 and the battery circuit 220 are connected through a four-way electromagnetic valve 12, it should be noted that, in the electric vehicle, the motor only has a cooling requirement, no heating requirement, and the waste heat generated during the operation of the motor can be used to heat the battery or the passenger cabin. In the embodiment of the invention, the cooling liquid is liquid water added by a motor water pump or a battery water pump, so the cooling liquid loop can also be called a waterway.

The air conditioning box 300 comprises a warm air core 9, a warm air PTC 8, an evaporator 7 and a blower 6, wherein the warm air core 9 is connected with the first electromagnetic three-way valve 11 and the water-cooled condenser 2, and compared with the prior art, the air conditioning box is added with the warm air PTC and the condenser is removed.

The electric automobile thermal management system comprises a low-temperature heating function, when the outdoor temperature is lower (less than-10 ℃), and when the battery and the passenger cabin are both in heating demand, the motor water pump 13 and the battery water pump 17 are both opened, the first electromagnetic three-way valve 11 is regulated to connect the battery loop 220 with the warm air core 9 in series, the second electromagnetic three-way valve 14 is controlled under the idle working condition, and the cooling liquid is prevented from leaking heat through the electric drive system after heating; the air conditioning box 300 is opened, the air blower 6 sends air into the evaporator 7, the air heating PTC 8 works, the inlet air of the evaporator 7 is heated, so that the temperature of the air flowing through the warm air core 9 is increased, the passenger cabin and the battery are heated, the heat is absorbed for the evaporator after the air heating PTC heats the air at a low temperature, the air conditioning capacity of the heat pump air is excited, the low-pressure side heat absorbing capacity and the high-pressure side heating capacity of the heat pump system are increased, and meanwhile, the temperature of the air flowing through the warm air core 9 is increased, so that the passenger cabin heating effect is better.

Further, on the basis of the above embodiment, the air conditioning case 300 further includes:

A mode damper 21;

The evaporator 7 and the air heating PTC 8 are connected in series, and the warm air core 9 is arranged side by side with the evaporator 7 and the air heating PTC 8 and is staggered;

the mode damper 21 is disposed between the warm air core 9 and the evaporator 7, and is used for controlling the air flow relation between the warm air core 9 and the evaporator 7.

Specifically, fig. 2 is a block diagram of an air conditioning box in an embodiment of an electric vehicle thermal management system according to the present invention, as shown in fig. 2, the air conditioning box 300 further includes a mode damper 21, an evaporator 7 and the air heating PTC 8 are connected in series, and the warm air core 9 is parallel to and staggered with the evaporator 7 and the air heating PTC 8; the mode air door is arranged between the warm air core 9 and the evaporator 7 and is used for controlling the airflow circulation relation between the warm air core 9 and the evaporator 7 so as to avoid mutual influence. The position of the mode air door 21 in the air conditioning box 300 is controlled through calibration, so that the evaporator 7 and the warm air core 9 can be connected in parallel without influencing each other and can work in series when air flows. When both the passenger compartment and the battery need to be heated, the evaporator 7 and the warm air core 9 are in a series mode, and the other cases are in a parallel mode, for example, only the passenger compartment needs to be heated, etc.

If the battery and the passenger cabin of the electric automobile are judged and known to need to be heated, the motor water pump 13 and the battery water pump 17 are both started, the first electromagnetic three-way valve 11 is regulated to connect the battery loop 220 with the warm air core 9 in series, the second electromagnetic three-way valve 14 is controlled under the idle working condition, and the cooling liquid is prevented from leaking heat through the electric drive system after heating; the air conditioning box 300 is opened, the evaporator 7 and the warm air core 9 are connected in parallel, the blower 6 sends air to the evaporator 7, the air heating PTC 8 works, and the inlet air of the evaporator 7 is heated, so that the temperature of the air flowing through the warm air core 9 is increased, and the passenger cabin and the battery are heated.

When it is determined that the passenger compartment of the electric vehicle needs to be heated alone, the four-way solenoid valve 12 is adjusted to disconnect from the battery circuit 220, and the mode damper 21 is adjusted to connect the warm air core 9 and the evaporator 7 in parallel. The compressor 1 is started, the refrigerant pressed into the compressor 1 is heated to be high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed to be high-pressure medium-temperature liquid through the water-cooling condenser 2, and meanwhile, the cooling liquid of the warm air core 9 is circularly heated, so that the heating requirement of the passenger cabin is met. The blower 6 blows air, and the air heating PTC 8 and the mode damper 21 are adjusted according to the ambient temperature and the current feed-forward and feedback control of the system.

If judging that the battery of the electric automobile needs to be heated independently, adjusting the first electromagnetic three-way valve 11 to be communicated with the water-cooling condenser 2 and disconnected with the warm air core 9; regulating the four-way solenoid valve 12 to communicate with the battery circuit 220; the mode damper 21 is adjusted to connect the warm air core 9 in parallel with the evaporator 7. The compressor 1 is started, the refrigerant is heated to be high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed to be high-pressure medium-temperature liquid through the water-cooling condenser 2, heat is released, the cooling liquid loop is heated, and then the battery loop is heated.

The air blower 6 blows air, the air heating PTC 8 heats the air, the air enters the evaporator 7, the high-pressure medium-temperature refrigerant liquid expands through the passenger cabin electronic expansion valve 3, the refrigerant expands from high pressure to low-pressure low-temperature liquid, and at the moment, the evaporator 7 is also heated, so that the evaporator can evaporate the refrigerant liquid but does not refrigerate, and medium-temperature refrigerant gas is generated through the gas-liquid separator. The refrigerant loop is continuously heated, and meanwhile, the electronic expansion valve 4 of the battery is closed, so that the refrigerant is prevented from being cooled, heat exchange with the cooling liquid is further performed, the temperature of the cooling liquid is reduced, and the heating effect is deteriorated.

In the embodiment of the invention, the first electromagnetic three-way valve is controlled, and the heating waterway does not flow through the warm air core body to realize rapid heating of the battery.

Further, in addition to the above embodiments, the motor circuit 210 further includes:

the front-end heat dissipation module 400 and the electric driving module 16 are sequentially connected, wherein the front-end heat dissipation module 400 comprises a front-end heat radiator 15 and a heat dissipation fan 20;

The second electromagnetic three-way valve 14 connects the front end radiator 400 and the electric drive module 16.

Specifically, as shown in fig. 1, the motor circuit 210 further includes: the front-end heat dissipation module 400 and the electric drive module 16 are sequentially connected, wherein the front-end heat dissipation module 400 comprises a front-end heat radiator 15 and a heat dissipation fan 20, and the front-end heat dissipation module 400 is used for dissipating heat of the motor. The second electromagnetic three-way valve 14 connects the front-end radiator 400 and the electric drive module 16, and the electric drive module 16 and the front-end radiator 400 can be connected to the motor circuit 210 or removed from the motor circuit 210 by adjusting the second electromagnetic three-way valve 14.

Fig. 3 is a schematic diagram comparing a front-end heat dissipation module with the prior art in an embodiment of the electric automobile thermal management system of the present invention, as shown in fig. 3, in the prior art, the front-end heat dissipation module includes a plurality of heat exchangers such as a condenser and a radiator, and the working temperature difference between the radiator and the condenser is different, and the front-end heat dissipation module has different front-back arrangement positions.

If the temperature of the motor body of the electric automobile is higher than the temperature of the cooling liquid, the first electromagnetic three-way valve 11 is adjusted to be communicated with the expansion kettle 19 and the motor water pump 13; the four-way electromagnetic valve 12 is regulated and communicated with the water-cooled condenser 2; the second electromagnetic three-way valve 14 is regulated to enable the front-end heat radiation module 400 and the electric drive module 16 to be communicated with the water-cooled condenser 2, and the waste heat of the motor is fully utilized to heat the battery and the passenger cabin.

The electric automobile thermal management system also comprises a high-temperature cooling function, and if the electric automobile motor to be cooled is judged and known, the motor water pump 13 is started; the first electromagnetic three-way valve 11 is regulated, and the warm air core 9 is disconnected; the four-way solenoid valve 12 is regulated, the battery loop 220 is disconnected, and the motor loop 210 is independently circulated; after the motor water pump 13 reaches the maximum duty ratio, the cooling fan 20 is started; the fan duty of the cooling fan 20 is controlled according to the outlet water temperature of the front-end radiator 15.

When the electric automobile thermal management system provided by the embodiment of the invention is used for heating, the low-pressure hot-air PTC directly heats air, the inlet temperature of the hot-air core body is improved, the heating effect of the passenger cabin is improved, meanwhile, the heat absorption capacity of the low-pressure side is improved when the heat pump works, the heating capacity of the high-pressure side is increased, the heat pump system can meet the whole automobile thermal management requirement at the temperature below-10 ℃, the high-pressure hot-air PTC is reduced, the hardware cost is reduced, and the electric architecture influence of the increased hot-air PTC is small.

Further, in addition to the above embodiments, the refrigerant circuit 100 further includes:

A battery electronic expansion valve 4 and a battery cooler 5 connected thereto;

the battery electronic expansion valve 4 is connected with the water-cooled condenser 2, and the battery cooler 5 is connected with the gas-liquid separator 10 and the battery cooling plate 18.

Specifically, as shown in fig. 1, the refrigerant circuit 100 further includes: a battery electronic expansion valve 4 and a battery cooler 5 connected with the same, wherein the battery cooler (Chiller) comprises a refrigerant passage and a cooling liquid passage.

If judging that the passenger cabin and the battery of the electric automobile need to be cooled, acquiring a difference value between the temperature of the air outlet of the passenger cabin and the target temperature;

controlling the rotational speed of the compressor 1 according to the difference;

And controlling the opening of the electronic expansion valve 3 of the passenger cabin and the opening of the electronic expansion valve 4 of the battery according to the superheat degree of the refrigerant at the inlet of the compressor 1 so as to meet the cooling requirements of the passenger cabin and the battery.

According to the use requirement, when the passenger cabin or the battery singly cools the request, the cooling requirement of the passenger cabin or the independent cooling requirement of the battery is met by closing the other electronic expansion valve.

The passenger cabin with moderate ambient temperature in spring and autumn has no refrigeration requirement, when the battery has a cooling requirement in charging or discharging, the temperature feedback of the water outlet of the front-end radiator 15 is collected to control whether the compressor 1 in the refrigerant loop 100 is started, the four-way electromagnetic valve 12 is regulated to enable the battery loop 220 to be connected with the motor loop 210 in series, the motor water pump 13 and the battery water pump 17 work together, so that the water flow of the battery and the electric driving module is met, the cooling requirements of the motor and the battery are met simultaneously by utilizing the front-end radiator, and the power consumption caused by starting an air conditioning system is reduced.

According to the electric automobile thermal management system provided by the embodiment of the invention, the size of the front-end radiator and the selection of the compressor are reasonably configured during high-temperature refrigeration, the requirements of passenger cabin cooling, battery cooling and electric drive module heat dissipation are met, the front-end cooling module only uses one radiator, the arrangement space is reduced, the interference of the front-end module on the whole automobile aerodynamic is reduced, meanwhile, the requirement of battery cooling can be met through the front-end radiator in spring and autumn, and the larger power consumption caused by the starting of the compressor is avoided.

Further, on the basis of the above embodiments, the electric drive module 16 includes:

a motor and an electric control.

Further, the electric driving module 16 further includes, on the basis of the above embodiments:

And (5) water cooling the parts.

Specifically, the electric driving module 16 includes a motor and an electric controller of the electric vehicle, and water cooling components, such as a dc-dc transformer DCDC, a charger PDU, and the like, can be added according to requirements for heat dissipation of the motor.

The electric automobile heat management system provided by the embodiment of the invention is an indirect heat pump system, integrates the heat management requirements of a passenger cabin, a battery and an electric drive system of the whole automobile, increases a low-power air heating PTC, excites the high-pressure side heating capacity of the heat pump system at low temperature, does not need a high-power water heating PTC, reduces the power consumption of the whole automobile, meets the requirements of rapid heating of the passenger cabin and battery heating at low temperature according to the actual use requirements of users, reduces the number of heat exchangers of a cooling module of a front cabin, meets the grid modeling requirements in the current electric automobile, and reduces the aerodynamic influence of the front cooling module on the whole automobile.

The embodiment of the invention also provides an electric automobile thermal management method, which is applied to the electric automobile thermal management system shown in fig. 1, and the electric automobile thermal management system comprises: a refrigerant circuit 100, a coolant circuit 200, and an air conditioning unit 300; the refrigerant loop 100 sequentially comprises a compressor 1, a water-cooled condenser 2, an electronic expansion valve 3 of a passenger cabin, an evaporator 7 and a gas-liquid separator 10; the cooling liquid circuit 200 comprises a motor circuit 210 and a battery circuit 220, and the motor circuit 210 and the battery circuit 220 are connected through a four-way electromagnetic valve 12; the motor loop 210 sequentially comprises an expansion kettle 19, a motor water pump 13, a second electromagnetic three-way valve 14, the four-way electromagnetic expansion valve 12, the water-cooled condenser 2 and a first electromagnetic three-way valve 11; the battery loop 220 sequentially comprises the four-way electromagnetic expansion valve 12, a battery cooling plate 18 and a battery water pump 17; the air conditioning box 300 comprises a warm air core 9, a warm air PTC 8, the evaporator 7 and a blower 6, wherein the warm air core 9 is connected with the first electromagnetic three-way valve 11 and the water-cooled condenser 2; the method comprises the following steps:

If the external temperature of the electric automobile is judged to be lower than a preset low-temperature threshold value, starting the motor water pump 13, the battery water pump 17 and the passenger cabin electronic expansion valve 3;

controlling the four-way solenoid valve 12 to communicate the motor circuit 210 with the battery circuit 220;

controlling the first electromagnetic three-way valve 11 to connect the battery loop 220 in series with the warm air core 9;

Controlling the blower 6 to blow air into the evaporator 7;

The air heating PTC 8 is controlled to heat the inlet air of the evaporator 7 so as to raise the temperature of the air flowing through the warm air core 9.

Specifically, the electric automobile thermal management system is divided into two functions of high-temperature cooling and low-temperature heating according to the use requirement of a user, and feedback control is performed by collecting parameters such as temperature or pressure according to the thermal management requirement of each component. The high temperature cooling includes: motor cooling mode, passenger cabin and battery cooling mode, individual cooling passenger cabin mode, individual cooling battery mode, spring and autumn cooling mode, etc., low temperature heating includes: battery and passenger compartment heating mode, individual heating passenger compartment mode, individual heating battery mode, waste heat utilization mode, etc.

When the outdoor temperature is lower, for example, less than-10 ℃, and there is a heating requirement for both the battery and the passenger compartment, fig. 4 is a block diagram of a thermal management system in a battery and passenger compartment heating mode of an electric vehicle according to an embodiment of the thermal management method of the present invention, as shown in fig. 1 and 4:

The motor water pump 13 and the battery water pump 17 are both started, the first electromagnetic three-way valve 11 is regulated to connect the battery loop 220 with the warm air core 9 in series, the waterway flow direction is shown in fig. 4, the second electromagnetic three-way valve 14 is controlled under the idle working condition, the condition that the heated cooling liquid leaks heat through the electric drive system is avoided, the relation between the temperature of the motor body and the temperature of the cooling liquid is related during driving, and the second electromagnetic three-way valve 14 is regulated to control whether the cooling liquid is subjected to waste heat utilization through electric drive or not; the air heating PTC8 works, heats the air at the inlet of the evaporator 7, improves the heat absorption capacity of the low-pressure side of the heat pump system, improves the heating quantity of the high-pressure side, and simultaneously improves the temperature of the gas flowing through the warm air core 9, so that the heating effect of the passenger cabin is better, the synchronous battery electronic expansion valve 4 is closed, and the refrigerant only expands through the passenger cabin electronic expansion valve 3.

Specifically, the motor water pump 13 and the battery water pump 17 are turned on, and the motor circuit and the battery circuit turn on the coolant circulation.

The compressor 1 is started, the refrigerant is heated to be high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed to be high-pressure medium-temperature liquid through the water-cooling condenser 2, heat is released, and the passenger cabin is heated. At the same time, the cooling liquid in the water-cooled condenser absorbs heat, and the cooling liquid loop is heated, so that the battery loop is heated.

The air blower 6 blows air, the air heating PTC 8 heats the air, the air enters the evaporator 7 and the warm air core 9, and the warm air core 9 blows warm air to the passenger cabin to accelerate the heating of the passenger cabin.

The refrigerant liquid with high pressure and medium temperature is expanded through the passenger cabin electronic expansion valve 3, the refrigerant is expanded from high pressure to low pressure and low temperature, and at the moment, whether the air door 21 in the air conditioning box 300 needs the air heating PTC 8 to supplement heat for the evaporator 7 in the air conditioning box 300 or not is controlled through the difference value between the evaporation temperature and the ambient temperature and the passenger cabin and the battery heating requirement calibration strategy, so that the heating capacity of the heat pump is excited.

The refrigerant loop is continuously heated, and meanwhile, the battery electronic expansion valve 4 is closed, so that the refrigerant is prevented from being cooled. The hot air flowing through the warm air core 9 enters the passenger cabin through the blower 6 to meet the heating requirement.

According to the electric automobile heat management method provided by the embodiment of the invention, when the electric automobile is heated, the low-pressure air heating PTC directly heats air to raise the inlet temperature of the air heating core body, the heating effect of the passenger cabin is improved, meanwhile, the heat absorption capacity of the low-pressure side is improved when the heat pump works, the heating capacity of the high-pressure side is increased, the heat pump system can meet the whole automobile heat management requirement when the environment temperature is below-10 ℃, the hardware cost is reduced by reducing the high-pressure air heating PTC, and the influence on the electric architecture of the electric automobile is small.

Further, on the basis of the above embodiment, the air conditioning case 300 further includes: a mode damper 21; the evaporator 7 and the air heating PTC 8 are connected in series, and the warm air core 9 is arranged side by side with the evaporator 7 and the air heating PTC 8 and is staggered; the mode damper 21 is disposed between the warm air core 9 and the evaporator 7, and the method further includes:

If it is determined that the passenger compartment of the electric vehicle needs to be heated independently, the four-way electromagnetic valve 12 is controlled to be disconnected from the battery loop 220;

the mode damper 21 is controlled so that the warm air core 9 is connected in parallel with the evaporator 7.

Specifically, whether the passenger compartment of the electric vehicle needs to be heated independently is determined, for example, whether the battery temperature does not meet the heating condition and the passenger compartment heating button is triggered by the user is determined, and the passenger compartment needs to be heated independently. Fig. 5 is a block diagram of a thermal management system in a passenger cabin mode of an electric vehicle in which the electric vehicle is heated alone according to an embodiment of the thermal management method of the present invention, and as shown in fig. 5, when the passenger cabin is heated alone, the four-way solenoid valve 12 is controlled to disconnect from the battery loop 220, and the mode damper 21 is adjusted to connect the warm air core 9 in parallel with the evaporator 7. The first electromagnetic three-way valve 11 is controlled to be communicated with the warm air core 9 and the water-cooled condenser 2 is disconnected, the second electromagnetic three-way valve is controlled to disconnect the front-end radiator 15 and the electric driving module 16, the battery electronic expansion valve 4 is closed, and the refrigerant loop 100 is opened.

The compressor 1 is started, the refrigerant pressed into the compressor 1 is heated to be high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed to be high-pressure medium-temperature liquid through the water-cooling condenser 2, and meanwhile, the cooling liquid of the warm air core 9 is circularly heated, so that the heating requirement of the passenger cabin is met. The blower 6 blows air, the air heating PTC 8 and the mode air door 21 are adjusted according to the ambient temperature and the current feedforward and feedback control of the system, so that the aim of independently heating the passenger cabin is fulfilled.

On the basis of the above embodiments, further comprising:

If judging that the battery of the electric automobile needs to be independently heated, controlling the first electromagnetic three-way valve 11 to disconnect the warm air core 9 and communicate with the water-cooled condenser 2;

the four-way solenoid valve 12 is controlled to communicate with the battery circuit 220.

Specifically, whether the battery of the electric automobile needs to be heated independently is judged, for example, if the battery temperature is judged to be in accordance with the heating condition, the user does not trigger a passenger cabin heating button, and the temperature outside the automobile is high, the battery needs to be heated independently is determined. FIG. 6 is a block diagram of a thermal management system in a battery mode for independently heating an electric vehicle according to an embodiment of the thermal management method for an electric vehicle of the present invention, wherein, as shown in FIG. 6, when the battery is independently heated, the first electromagnetic three-way valve 11 is controlled to be communicated with the water-cooled condenser 2 and disconnected from the warm air core 9; control the four-way solenoid valve 12 to communicate with the battery circuit 220; the mode damper 21 is adjusted to connect the warm air core 9 in parallel with the evaporator 7. The first electromagnetic three-way valve 11 is controlled to be communicated with the water-cooled condenser 2, the second electromagnetic three-way valve is controlled to disconnect the front-end radiator 15 and the electric drive module 16, the battery electronic expansion valve 4 is closed, and the refrigerant loop 100 is opened. Wherein the direction indicated by the arrow is the waterway flow direction.

The compressor 1 is started, the refrigerant is heated to be high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed to be high-pressure medium-temperature liquid through the water-cooling condenser 2, heat is released, the cooling liquid loop is heated, and then the battery loop is heated.

The air blower 6 blows air, the air heating PTC 8 heats the air, the air enters the evaporator 7, the high-pressure medium-temperature refrigerant liquid expands through the passenger cabin electronic expansion valve 3, the refrigerant expands to be low-pressure low-temperature liquid from high-pressure expansion, the refrigerant loop is continuously heated, meanwhile, the battery electronic expansion valve 4 is closed, the refrigerant is prevented from being cooled, heat exchange is further carried out between the refrigerant and the cooling liquid, the temperature of the cooling liquid is reduced, and the heating effect is deteriorated.

Further, in addition to the above embodiments, the motor circuit 210 further includes: the front-end heat dissipation module 400 and the electric driving module 16 are sequentially connected, wherein the front-end heat dissipation module 400 comprises a front-end heat radiator 15 and a heat dissipation fan 20; the second electromagnetic three-way valve 14 connects the front-end radiator 15 and the electric drive module 16, the method further comprising:

If the difference value between the temperature of the motor body of the electric automobile and the temperature of the cooling liquid is higher than a difference value threshold value, the first electromagnetic three-way valve 11 is controlled to be communicated with the warm air core 9 and disconnected with the water-cooled condenser 2;

the second electromagnetic three-way valve 14 is controlled to enable the front-end heat radiation module 400 and the electric driving module 16 to be communicated with the water-cooled condenser 2.

Specifically, if the difference between the temperature of the motor body of the electric automobile and the temperature of the cooling liquid is greater than the difference threshold, the waste heat of the motor can be utilized for heating. Fig. 7 is a block diagram of a thermal management system in a motor waste heat utilization mode of an electric vehicle according to an embodiment of the thermal management method of the present invention, as shown in fig. 7, a first electromagnetic three-way valve 11 is controlled to be communicated with a warm air core 9, an expansion kettle 19 and a motor water pump 13; a control four-way solenoid valve 12 which is communicated with the water-cooled condenser 2, the motor loop 210 and the battery loop 220; the second electromagnetic three-way valve 14 is controlled to enable the front-end heat radiation module 400 and the electric drive module 16 to be communicated with the water-cooled condenser 2, wherein the direction indicated by the arrow is the waterway flow direction.

When the motor temperature is too high and heat dissipation is too high, the coolant is further heated, and the battery is heated through the battery circuit 220 in the coolant circuit.

The temperature of the cooling liquid is increased, and when the cooling liquid exchanges heat with the refrigerant in the water-cooled condenser 2, the temperature of the refrigerant can be increased, so that the heat of the refrigerant loop 100 is increased, the passenger cabin is heated, and the battery and the passenger cabin are heated by fully utilizing the waste heat of the motor.

On the basis of the above embodiments, further, the method further includes:

If judging that the motor of the electric automobile needs to be cooled, controlling the second electromagnetic three-way valve 14 to be communicated with the front-end heat radiation module 400;

Controlling the first electromagnetic three-way valve 11 to be communicated with the water-cooled condenser 2 and disconnect the warm air core 9;

Controlling the four-way electromagnetic valve 12, disconnecting the battery loop 220, and enabling the motor loop 210 to circulate independently;

Closing the refrigerant loop 100 and starting the motor water pump 13;

after the motor water pump 13 reaches the maximum duty ratio, the cooling fan 20 is started;

the fan duty ratio of the heat radiation fan 20 is controlled according to the outlet water temperature of the front-end radiator 15.

Specifically, fig. 8 is a block diagram of a thermal management system in a motor cooling mode of an electric vehicle according to an embodiment of the thermal management method of the present invention, and as shown in fig. 8, when only a motor has a cooling requirement, the first electromagnetic three-way valve 11 is controlled to be disconnected from the warm air core 9, to be communicated with the water-cooled condenser 9 and the motor loop 210, the four-way electromagnetic valve 12 is controlled to be communicated with the water-cooled condenser 2, and the battery loop 220 is disconnected to enable the motor loop 210 to be circulated independently; the refrigerant circuit 100 is closed.

The motor water pump 13 is started, the motor water pump 13 controls the outlet water temperature of the associated front-end radiator 15, the motor loop 210 is independently circulated by controlling the four-way electromagnetic valve 12, the front-end radiator fan 20 is started after the motor water pump 13 reaches the maximum duty ratio, the outlet water temperature of the associated front-end radiator 15 is also controlled, the duty ratio of the fan is controlled, the motor or the motor controller body temperature is used as a forced auxiliary control condition in an auxiliary manner, and when the motor temperature or the motor controller temperature reaches a certain limit value, the motor water pump 13 and the radiator fan 20 are fully started, so that the motor cooling effect is achieved.

Further, in addition to the above embodiments, the refrigerant circuit 100 further includes: a battery electronic expansion valve 4 and a battery cooler 5 connected thereto; the battery electronic expansion valve 4 is connected with the water-cooled condenser 2, the battery cooler 5 is connected with the gas-liquid separator 10 and the battery cooling plate 18, and the method further comprises:

If judging that the passenger cabin and the battery of the electric automobile need to be cooled, starting the refrigerant loop 100;

And controlling the opening degrees of the passenger cabin electronic expansion valve 3 and the battery electronic expansion valve 4 according to the superheat degree of the refrigerant at the inlet of the compressor 1.

Specifically, fig. 9 is a block diagram of a thermal management system in a passenger cabin and a battery cooling mode of an electric vehicle in an embodiment of a thermal management method of the present invention, and as shown in fig. 9, when the passenger cabin and the battery of the electric vehicle need to be cooled, the refrigerant circuit 100 is opened, the first electromagnetic three-way valve 11 is controlled to disconnect the warm air core 9, the motor circuit 210 and the water-cooled condenser 2 are connected, the four-way electromagnetic valve 12 is controlled to disconnect the battery circuit 220, and the second electromagnetic three-way valve 14 is controlled to connect the front end heat dissipation module 400 and the electric drive module 16 in the motor circuit 210.

The compressor 1 is started, the refrigerant is heated to be high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed to be high-pressure medium-temperature liquid through the water-cooling condenser 2, the high-pressure medium-temperature refrigerant liquid is expanded through the passenger cabin electronic expansion valve 3, the expanded refrigerant is subjected to phase change evaporation through the evaporator 7, the air inlet temperature of the evaporator 7 is reduced, low-temperature cool air is blown out, and then the refrigerating effect is achieved, so that the passenger cabin temperature is reduced.

The high-pressure medium-temperature refrigerant liquid expands through the battery electronic expansion valve 4 and is cooled down through the battery cooler 5, so that the battery temperature is reduced.

The rotating speed of the compressor 1 can be controlled linearly according to the difference value between the temperature of the air outlet of the passenger cabin and the target temperature, and the opening of the passenger cabin electronic expansion valve 3 and the battery electronic expansion valve 4 is controlled according to the superheat degree of the refrigerant at the inlet of the compressor 1, so that the cooling requirements of the passenger cabin and the battery are met.

Further, on the basis of the above embodiments, if it is determined that it is only necessary to cool the passenger compartment of the electric vehicle, the battery electronic expansion valve 4 is closed.

Specifically, fig. 10 is a block diagram of a thermal management system in a passenger cabin mode of an electric vehicle in an embodiment of a thermal management method of the present invention, and as shown in fig. 10, when only the passenger cabin of the electric vehicle needs to be cooled, the refrigerant circuit 100 is opened, the battery electronic expansion valve 4 is closed, and the refrigerant circuit of the battery cooler 5 is disconnected. The first electromagnetic three-way valve 11 is controlled to disconnect the warm air core 9, the motor loop 210 and the water-cooled condenser 2 are connected, the four-way electromagnetic valve 12 is controlled to disconnect the battery loop 220, and the second electromagnetic three-way valve 14 is controlled to connect the front-end heat radiation module 400 and the electric drive module 16 in the motor loop 210.

Further, on the basis of the above embodiments, if it is determined that it is only necessary to cool the battery of the electric vehicle, the passenger compartment electronic expansion valve 3 is closed.

Specifically, fig. 11 is a block diagram of a thermal management system in a battery mode for cooling an electric vehicle alone in an embodiment of a thermal management method for an electric vehicle according to the present invention, and as shown in fig. 11, when only the battery of the electric vehicle needs to be cooled, the refrigerant circuit 100 is opened, the passenger compartment electronic expansion valve 3 is closed, and the refrigerant circuit of the evaporator 7 is disconnected. The first electromagnetic three-way valve 11 is controlled to disconnect the warm air core 9, the motor loop 210 and the water-cooled condenser 2 are connected, the four-way electromagnetic valve 12 is controlled to disconnect the battery loop 220, and the second electromagnetic three-way valve 14 is controlled to connect the front-end heat radiation module 400 and the electric drive module 16 in the motor loop 210.

The compressor 1 is started, the refrigerant is heated to be high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed to be high-pressure medium-temperature liquid through the water-cooling condenser 2, the high-pressure medium-temperature refrigerant liquid is expanded through the battery electronic expansion valve 4, and the high-pressure medium-temperature refrigerant liquid is cooled through the battery cooler 5, so that the battery temperature is reduced.

On the basis of the above embodiments, further, the method further includes:

Acquiring the water outlet temperature of the front-end radiator 15;

after judging that the temperature of the water outlet meets the preset condition, controlling the four-way electromagnetic valve 12 to connect the battery loop 220 and the motor loop 210 in series;

the refrigerant circuit 100 is closed and the motor water pump 13 is turned on.

Specifically, the ambient temperature in spring and autumn is moderate, the passenger cabin has no refrigeration requirement, when the battery has a cooling requirement in charging or discharging, whether the compressor 1 of the worker of the refrigerant loop 100 is started or not is controlled by collecting the temperature feedback of the water outlet of the front-end radiator 15, for example, the judgment condition can be set as follows: the temperature of the water outlet of the radiator is less than or equal to T DEG C and is less than or equal to the battery evaluation temperature, and the temperature of the water outlet of the radiator is more than or equal to delta T DEG C.

Fig. 12 is a block diagram of a thermal management system in a spring and autumn cooling mode of an electric vehicle according to an embodiment of the thermal management method of the present invention, as shown in fig. 12, the four-way solenoid valve 12 is controlled to connect the battery loop 220 and the motor loop 210 in series, the first electromagnetic three-way valve 11 is controlled to disconnect from the warm air core 9, and the refrigerant loop 100 is closed, wherein the direction indicated by the arrow is the water path flow direction.

The motor water pump 13 and the battery water pump 17 are started, the motor water pump 13 and the battery water pump 17 work together, so that the water flow of the battery and the electric drive system is satisfied, the front-end radiator 15 is utilized to simultaneously satisfy the cooling requirements of the motor and the battery, the power consumption caused by the starting of an air conditioning system is reduced,

If the cooling requirement is not met, the cooling circuit 100 is opened to continue cooling.

According to the electric automobile heat management method provided by the embodiment of the invention, during high-temperature refrigeration, the size of the front-end radiator and the selection of the compressor are reasonably configured, the requirements of cooling the passenger cabin, cooling the battery and radiating the electric drive system are met, and the front-end cooling module only uses one radiator to reduce the arrangement space. And the interference of the front end module to the aerodynamic of the whole vehicle is reduced, and meanwhile, the front end radiator can also meet the cooling requirement of the battery in spring and autumn, so that the larger power consumption caused by the starting of the compressor is avoided.

It should be noted that, for simplicity of description, the method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the embodiments are not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.

The invention provides an electric automobile thermal management system and an electric automobile thermal management method, which are described in detail, wherein specific examples are applied to illustrate the principles and the implementation modes of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims

1. An electric vehicle thermal management system, comprising: a refrigerant loop, a cooling liquid loop and an air conditioning box;

2. The system of claim 1, wherein the air conditioning case further comprises:

a mode damper;

3. The system of claim 2, wherein the motor circuit further comprises:

4. The system of claim 3, wherein the refrigerant circuit further comprises:

5. The system of claim 4, wherein the electric drive module comprises:

a motor and an electric control.

6. The system of claim 5, wherein the electric drive module further comprises:

And (5) water cooling the parts.

7. The electric automobile heat management method is characterized by being applied to an electric automobile heat management system, and the electric automobile heat management system comprises the following steps: a refrigerant loop, a cooling liquid loop and an air conditioning box; the refrigerant loop sequentially comprises a compressor, a water-cooled condenser, an electronic expansion valve of the passenger cabin, an evaporator and a gas-liquid separator; the cooling liquid loop comprises a motor loop and a battery loop, and the motor loop and the battery loop are connected through a four-way electromagnetic valve; the motor loop sequentially comprises an expansion kettle, a motor water pump, a second electromagnetic three-way valve, the four-way electromagnetic expansion valve, the water-cooling condenser and a first electromagnetic three-way valve; the battery loop sequentially comprises the four-way electromagnetic expansion valve, a battery cooling plate and a battery water pump; the air conditioner comprises a warm air core body, a warm air PTC, the evaporator and a blower, wherein the warm air core body is connected with the first electromagnetic three-way valve and the water-cooled condenser; the method comprises the following steps:

controlling the blower to blow air into the evaporator;

8. The method of claim 7, wherein the air conditioning case further comprises: a mode damper; the evaporator and the air heating PTC are connected in series, and the warm air core body, the evaporator and the air heating PTC are arranged side by side and staggered; the mode damper is disposed between the warm air core and the evaporator, the method further comprising:

9. The method as recited in claim 8, further comprising:

10. The method of claim 9, wherein the motor circuit further comprises: the front-end heat dissipation module comprises a front-end radiator and a heat dissipation fan; the second electromagnetic three-way valve connects the front-end radiator and the electric drive module, the method further comprising:

11. The method of claim 7, wherein the method further comprises:

closing the refrigerant loop and starting the motor water pump;

12. The method of claim 11, wherein the refrigerant circuit further comprises: a battery electronic expansion valve and a battery cooler connected with the battery electronic expansion valve; the battery electronic expansion valve is connected with the water-cooled condenser, the battery cooler is connected with the gas-liquid separator and the battery cooling plate, and the method further comprises:

13. The method according to claim 12, wherein the method further comprises:

14. The method according to claim 12, wherein the method further comprises:

15. The method according to claim 12, wherein the method further comprises:

acquiring the temperature of a water outlet of the front-end radiator;

And closing the refrigerant loop and starting the motor water pump.