CN116039327A

CN116039327A - Multi-way valve thermal management system and automobile

Info

Publication number: CN116039327A
Application number: CN202211579941.6A
Authority: CN
Inventors: 余强元; 张毅; 奚辉
Original assignee: Shanghai Mahle Thermal Systems Co ltd
Current assignee: Shanghai Mahle Thermal Systems Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-02

Abstract

The invention discloses a multi-way valve heat management system and an automobile, which comprise a heat exchanger, a low-temperature radiator, a condenser, a water heating PTC, a warm air core body and a power battery pack, wherein the heat exchanger, the low-temperature radiator, the condenser, the water heating PTC, the warm air core body and the power battery pack are connected with a runner plate and the multi-way valve to form a loop through which cooling liquid flows; the multi-way valve comprises at least one movable valve core, and the communication or closing among a plurality of pipelines is switched through the movable valve core; the multi-way valve at least comprises a movable valve core for switching the pipelines to the following states: the heat exchanger is connected with the motor electric control cooling device which is connected end to end, and the low-temperature radiator is connected into a first loop through a multi-way valve; the condenser, the water heating PTC, the warm air core body and the power battery pack are connected into a second loop through a multi-way valve; wherein, the inlet and outlet of the condenser, the water heating PTC and the warm air core body which are connected in sequence are provided with two short-circuit pipelines at one end connected with the multi-way valve; and at least one of the short-circuit lines can be closed by a valve. The application of the invention improves the integration level of the cooling liquid loop and reduces the number of parts of the thermal management system.

Description

Multi-way valve thermal management system and automobile

Technical Field

The invention relates to the technical field of new energy vehicle thermal management, in particular to a multi-way valve thermal management system and an automobile.

Background

Along with the continuous rising of fuel price, the permeability of new energy automobiles is also continuously improved. With the rising of the purchase enthusiasm of new energy automobiles, people pay more attention to the cruising and safety of the new energy automobiles.

The traditional fuel oil vehicle has single heat management function, fewer parts and simple system functions.

The new energy automobile is driven by electric energy, the cold and hot requirements of the passenger cabin, the temperature of the battery pack is balanced, electric energy is consumed during electric control cooling of the motor, and compared with a traditional fuel automobile, the system is more complex in energy management content. Therefore, thermal management is increasingly important in improving the energy utilization rate and guaranteeing the whole vehicle endurance and the safety of the battery pack.

Wherein the thermal management system comprises a refrigerant circuit and a coolant circuit, wherein the coolant circuit plays an important role in the new energy thermal management system.

The existing new energy automobile heat management system is mainly distributed, and functional components such as passenger cabins, batteries, motors and the like mainly depend on cooling liquid for heat exchange and are respectively arranged in different loops. In order to realize the communication between different loops, a plurality of three-way and four-way valves are used in the loops, and different system functions are realized through the combined switching of different water valves.

Because the parts of the thermal management system are distributed at different positions of the whole vehicle, the parts are connected through pipelines and then fixed on the whole vehicle, the parts are distributed, and the system integration level is low. For the whole vehicle factories, the materials are various, the occupied space is large, the system control is complex, and the problem of insufficient energy utilization is caused. Finally, the development period of the thermal management system is long, the cost is high, the whole vehicle is complex to assemble, and the maintenance is inconvenient.

And under the lower condition of temperature environment, the battery of new energy automobile charges and discharges difficultly under low temperature, and has the risk of damaging, and prior art realizes the battery heating through the mode that the battery is alone external heating package, occupies the interior space more and needs more energy.

Therefore, in the whole vehicle thermal management system, how to improve the integration level of the cooling liquid loop, reduce the number of parts, and comprehensively manage the dispersed thermal management system and reasonably heat the battery becomes a technical problem which needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the problems of low integration level of a cooling liquid loop, complex structure and inconvenient heating of a battery in the prior art, the application provides a multi-way valve heat management system and an automobile.

In order to achieve the aim, the invention discloses a multi-way valve heat management system which comprises a heat exchanger, a motor electric control cooling device, a low-temperature radiator, a condenser, a water heating PTC, a warm air core body and a power battery pack.

The heat exchanger, the motor electric control cooling device, the low-temperature radiator, the condenser, the water heating PTC, the warm air core body and the power battery pack are all connected with the multi-way valve through a runner plate to form a loop for circulating cooling liquid;

the multi-way valve comprises at least one movable valve core, and the communication among a plurality of pipelines is switched or closed by the movable valve core;

the multi-way valve at least comprises the movable valve core for switching a plurality of pipelines to the following states:

the motor electric control cooling device, the low-temperature radiator and the multi-way valve are connected in series to form a motor electric control branch;

the heat exchanger is connected with the multi-way valve in series to form a heat exchanger branch;

the power battery pack is connected with the multi-way valve in series to form a battery branch;

the condenser, the water heating PTC, the warm air core body and the multi-way valve are connected in series to form a passenger cabin heating branch;

the heat exchanger branch and the motor electric control branch are communicated with each other through the multi-way valve to form a first loop;

the passenger cabin heating branch and the battery branch are communicated with each other through the multi-way valve to form a second loop;

wherein the passenger cabin heating branch comprises two parallel short-circuit pipelines at one side connected with the multi-way valve;

at least one of the two short-circuit lines can be closed by a first proportional three-way valve.

The application of the invention improves the integration level of the cooling liquid loop, reduces the number of parts of the thermal management system, reduces the occupied space of the thermal management system, and reduces the energy waste by comprehensively managing the dispersed thermal management systems.

Further, the heat exchanger loop and the motor electric control loop are connected in series to form the first loop, so that the effect of recovering waste heat of the motor electric control can be achieved; and the passenger cabin heating loop and the battery loop are connected in series to form a second loop, so that the effect of heating the battery is achieved.

Preferably, the multi-way valve comprises a C1 interface, a C2 interface, a C3 interface, a C4 interface, a C5 interface, a C6 interface, a C7 interface and a C8 interface; the C1 interface and the C2 interface are respectively abutted to the outlet and the inlet of the passenger cabin heating branch, the C3 interface and the C4 interface are respectively abutted to the inlet and the outlet of the battery branch, the C5 interface and the C6 interface are respectively corresponding to the inlet and the outlet of the heat exchanger branch, the C7 interface and the C8 interface are respectively corresponding to the inlet and the outlet of the motor electric control branch, wherein the C1 interface and the C3 interface are mutually communicated, the C2 interface and the C4 interface are mutually communicated, the C6 interface and the C7 interface are mutually communicated, and the C5 interface and the C8 interface are mutually communicated.

Preferably, the connection between the C1 interface and the condenser is realized by arranging a plurality of tee joints at the connection position of the condenser and the two short-circuit pipelines;

and the connection between the C2 interface and the warm air core body is realized by arranging a plurality of tee joints at the connection position of the warm air core body and the two short circuit pipelines.

Preferably, the electric control cooling device of the motor and the low-temperature radiator which are connected end to end are connected with the pipelines connected with the multi-way valve, and the pipelines connected with the condenser, the water heating PTC, the heating core and the multi-way valve, and the pipelines connected with the power battery pack and the multi-way valve are respectively provided with a cooling liquid circulating water pump.

Preferably, a loop for flowing through the refrigerant is arranged between the heat exchanger and the condenser;

when the passenger cabin heating branch is in a passenger cabin heating or dehumidifying working condition, heat is from the condenser, if the heat is insufficient, the water heating PTC works to heat the cooling liquid in the passenger cabin heating branch, so that the requirement of warm air is met;

the refrigerant transfers the carried heat to the cooling liquid of the passenger cabin heating branch through the condenser.

Preferably, the loop through which the refrigerant flows is provided with an evaporator, and the warm air core is assembled with the evaporator and provided with a blower; and/or the loose path flowing through the refrigerant is provided with an outdoor heat exchanger;

the blower, the warm air core and the evaporator are arranged in the passenger cabin; the air blower is used for accelerating air passing through the warm air core body and the evaporator to realize heat exchange.

Preferably, the low-temperature radiator is connected in parallel with a second proportional three-way valve, so that the motor electric control branch office has a bypass effect, and the corresponding flow of the cooling liquid is distributed through the second proportional three-way valve.

Preferably, a condensing fan is arranged at the low-temperature radiator;

the condensing fan is used for assisting in heat dissipation; and/or the number of the groups of groups,

the warm air core is provided with a blower, and the blower and the warm air core are arranged at the position of the warm air core; the air blower is used for accelerating air passing through the warm air core body and realizing heat exchange.

Preferably, the runner plate comprises a plurality of runners for conveying cooling liquid, the runners are arranged in parallel, one ends of the runners are connected with the multi-way valve, and the other ends of the runners are connected with the corresponding heat exchanger, the motor electric control cooling device, the low-temperature radiator, the condenser, the water heating PTC, the heating core body or the power battery pack.

The invention also provides an automobile, which adopts the multi-way valve heat management system.

The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.

Drawings

Fig. 1 shows a structural view of an embodiment of the present invention.

Fig. 2 is a schematic diagram showing a state in which the second proportional three-way valve is fully opened and the coolant does not pass through the low-temperature radiator in an embodiment of the invention.

Fig. 3 is a schematic diagram showing a state in which the second proportional three-way valve completely closes the coolant to pass through the low-temperature radiator in an embodiment of the invention.

Fig. 4 is a schematic diagram showing a state where one of two short-circuit lines is closed, in which the second proportional three-way valve is completely closed in an embodiment of the present invention.

Fig. 5 shows a schematic diagram of a refrigerant connection circuit in an embodiment of the invention.

FIG. 6 shows a schematic diagram of the interface arrangement of an eight-way valve in an embodiment of the invention.

FIG. 7 is a schematic diagram of the interface of the eight-way valve according to an embodiment of the present invention.

1, a heat exchanger; 2. an electric control cooling device of the motor; 3. a low temperature heat sink; 4. a condenser; 5. a water heating PTC; 6. a warm air core; 7. a power battery pack; 8. a cooling liquid circulating water pump; 9. an evaporator; 10. an electric control branch of the motor; 11. a battery branch; 12. a passenger cabin heating branch; 13. a heat exchanger branch; 14. an outdoor heat exchanger; 15. a short circuit line; 16. a first proportional three-way valve; 17. and a second proportional three-way valve.

Detailed Description

Examples

As shown in fig. 1 to 4, the multi-way valve heat management system comprises a heat exchanger 1, a motor electric control cooling device 2, a low-temperature radiator 3, a condenser 4, a water heating PTC5, a warm air core 6 and a power battery pack 7.

The heat exchanger 1, the motor electric control cooling device 2, the low-temperature radiator 3, the condenser 4, the water heating PTC5, the warm air core 6 and the power battery pack 7 are all connected with the multi-way valve through flow passage plates to form a loop for circulating cooling liquid;

the multi-way valve comprises at least one movable valve core, and the communication or closing among a plurality of pipelines is switched through the movable valve core;

the multi-way valve at least comprises a movable valve core for switching the pipelines to the following states:

the motor electric control cooling device 2, the low-temperature radiator 3 and the multi-way valve are connected in series to form a motor electric control branch circuit 10;

the heat exchanger 1 is connected with a multi-way valve in series to form a heat exchanger branch 13;

the power battery pack 7 is connected with the multi-way valve in series to form a battery branch 11;

the condenser 4, the water heating PTC5, the warm air core 6 and the multi-way valve are connected in series to form a passenger cabin heating branch 12;

the heat exchanger branch 13 and the motor electric control branch 10 are communicated with each other through a multi-way valve to form a first loop;

the passenger cabin heating branch 12 and the battery branch 11 are communicated with each other through a multi-way valve to form a second loop;

wherein the passenger cabin heating branch comprises two parallel short-circuit pipelines 15 at one side connected with the multi-way valve;

of the two short-circuit lines 15, at least one short-circuit line 15 can be closed by a first proportional three-way valve 16.

The application of the invention reduces the number of parts of the thermal management system by improving the integration level of the cooling liquid loop and comprehensively managing the scattered thermal management system to reduce the energy waste.

Further, the heat exchanger branch 13 and the motor electric control branch 10 are connected in series to form a first loop, so that the waste heat recovery effect on the motor electric control can be achieved; and the passenger cabin heating branch 12 and the battery branch 11 are connected in series to form a second loop, so that the effect of heating the battery is achieved.

As shown in fig. 1-4, in certain embodiments, the multi-way valve of an embodiment includes a C1 interface, a C2 interface, a C3 interface, a C4 interface, a C5 interface, a C6 interface, a C7 interface, and a C8 interface;

wherein, the C1 interface and C2 respectively dock with the outlet and inlet of the passenger cabin branch 12, the C3 interface and C4 respectively dock with the inlet and outlet of the battery branch 11, the C5 interface and C6 respectively correspond with the inlet and outlet of the heat exchanger branch 13, and the C7 interface and C8 respectively correspond with the inlet and outlet of the motor electric control branch 10.

Specifically, the connection mode of the 8 interfaces is as follows: the C1 interface and the C3 interface are communicated with each other, the C2 interface and the C4 interface are communicated with each other, the C6 interface and the C7 interface are communicated with each other, and the C5 interface and the C8 interface are communicated with each other, so that the series connection of the heat exchanger branch 13 and the electric control branch 10 of the motor and the series connection of the heating branch 12 of the passenger cabin and the battery branch 11 are realized.

In other embodiments, the number of interfaces of the multi-way valve may be 9, 10, 11, etc., and the above connection method may be implemented.

In some embodiments, between the C1 interface and the condenser 4, the connection is made by means of a plurality of tee joints provided at the position where the condenser 4 is connected to the two short-circuit lines 15;

and the connection between the C2 interface and the warm air core 6 is realized by arranging a plurality of tee joints at the connection position of the warm air core 6 and the two short-circuit pipelines 15.

In some embodiments, the low-temperature radiator 3 is connected in parallel with a second proportional three-way valve 17, so that the motor electric control branch 10 has a bypass effect, and the corresponding flow of the cooling liquid is distributed through the second proportional three-way valve 17. When the cooling liquid only flows through the low-temperature radiator 3, the second proportional three-way valve 17 is in a closed state; the second proportional three-way valve 17 is in an open state when the coolant flows back to the multi-way valve through the bypass line without passing through the low temperature radiator 3.

Under the above-mentioned connected state, the multiport valve thermal management system of this application can realize 3 kinds of operating modes, is respectively: working condition 1, waste heat recovery of electric motor control, and common heating of passenger cabin and power battery pack; working condition 2, electric control cooling of a motor, and common heating of a passenger cabin and a power battery pack; and 3, cooling by electric control of a motor, blowing of a passenger cabin and heating of a battery pack.

Referring to fig. 2, specifically, in condition 1:

in the working condition 1, the first proportional three-way valve 16 is in an open state, i.e. the two short-circuit pipelines 15 are in a passage state; the second proportional three-way valve 17 is in an open state, i.e. the coolant passes through the bypass circuit without passing through the low temperature radiator 3.

In the first circuit, the heat exchanger branch 13 is communicated with the motor electric control branch 10, namely, the heat exchanger 1 and the motor electric control cooling device 2 are connected in series through a multi-way valve, and the cooling liquid passes through the heat exchanger 1 and does not pass through the low-temperature radiator 3. Therefore, when the passenger cabin needs to be heated, the heat exchanger 1 can absorb heat from the cooling liquid, and as the refrigerant circulation loop is arranged between the heat exchanger 1 and the condenser 4 positioned in the passenger cabin, redundant heat in the electric control branch 10 of the motor can be brought into the passenger cabin through the heat exchanger 1 and the condenser 4 by the refrigerant, so that the electric control waste heat recovery of the motor is realized.

In the second loop, the passenger cabin heating branch is mutually communicated with the battery branch, namely, the condenser 4, the water heating PTC5, the warm air core 6 and the power battery pack 7 are mutually connected in series through the multi-way valve, and the cooling liquid passes through two short circuit pipelines 13, and the specific process is as follows:

for the short circuit line 15 with the first proportional three-way valve 16, the cooling liquid flowing out of the warm air core 6 is partly returned to the condenser 4 via the first proportional three-way valve 16 and partly enters the power battery pack 7 via the first proportional three-way valve 16.

For the other short circuit pipeline 15 without the first proportional three-way valve 16, the cooling liquid flows from the position b of the short circuit pipeline 13 to the position a, then enters the power battery pack 7 from the position a through the multi-way valve, and returns to the position b through the multi-way valve after flowing through the power battery pack 7 to enter the next cycle;

the cooling liquid flowing through the second circuit 12 in this way can realize the co-heating of the passenger compartment and the power battery pack 7.

Referring to fig. 3, specifically, in condition 2:

in the working condition 2, the first proportional three-way valve 16 is in an open state, i.e. the two short-circuit pipelines 15 are in a passage state; the second proportional three-way valve 17 is closed, i.e. the coolant only passes through the low-temperature radiator 3.

In the first circuit, the heat exchanger branch 13 is mutually communicated with the motor electric control branch 10, namely, the heat exchanger 1 is mutually connected in series with the motor electric control cooling device 2 and the low-temperature radiator 3 through a multi-way valve. At this time, the heat exchanger 1 in the first loop does not exchange heat and only serves as a connecting channel, so that the electric motor cooling device 2 can be cooled through the low-temperature radiator 3, and electric motor cooling can be realized.

The working principle of the second loop in the working condition 2 is the same as that in the working condition 1, and a description thereof is omitted.

Referring to fig. 4, specifically, in condition 3:

in the working condition 3, the first proportional three-way valve 16 is in a closed state, namely, only one of the two short-circuit pipelines 15 is in a passage state; the second proportional three-way valve 17 is closed, i.e. the coolant only passes through the low temperature radiator.

The working principle of the first loop in the working condition 3 is the same as that in the working condition 2, and a description thereof is omitted.

In the second circuit, one short-circuit line 15 is closed by the first proportional three-way valve 16, the coolant is cooled by the low-temperature radiator 3, and the heat exchanger 1 does not work:

in this state, the passenger cabin does not need to be heated, the heat acquired from the condenser 4 is brought into the warm air core 6 through the cooling liquid, the warm air core 6 does not pass through the air, no heat exchange can be performed, the cooling liquid coming out of the warm air core 6 enters the power battery pack 7, and the heating of the system is used for heating the power battery pack 7. The air blowing of the passenger cabin is realized by starting an air blower arranged at the warm air core 6.

In some embodiments, the motor electric control branch 10, the battery branch 11 and the passenger cabin heating branch 12 are provided with a cooling liquid circulating water pump 8.

Specifically, a coolant circulating water pump 8 is disposed at the water inlet side of the power battery pack 7, and is used for providing power for the coolant circulation in the battery loop 11 and the heat exchanger loop 13 which are communicated with each other; a cooling liquid circulating water pump 8 is arranged at the water inlet side of the motor electric control cooling device 2 and is used for providing power for cooling liquid circulation in the motor electric control loop 10; a coolant circulation water pump is provided at the water inlet side of the condenser 4, and functions to power the coolant in the passenger compartment heating circuit 12.

In some embodiments, a circuit through which the refrigerant flows is provided between the heat exchanger 1 and the condenser 4;

so that the heat exchange of the heat exchanger 1 and the condenser 4 is heat transfer by the refrigerant and the cooling liquid. When the passenger cabin heating branch 12 is in a passenger cabin heating or dehumidifying working condition, heat is from the condenser 4, and if the heat is insufficient, the water heating PTC5 works to heat the cooling liquid in the passenger cabin heating branch 12, so that the requirement of warm air is met;

the refrigerant transfers the carried heat through the condenser 4 to the coolant of the passenger compartment heating branch 12.

When heat is to be dissipated by the condenser 4, heat needs to be absorbed from another place, and the heat exchanger 1 serves as an outdoor heat exchanger, and may absorb a certain amount of heat from the cooling liquid. In the battery loop, if excessive heat is carried away by the cooling liquid in the battery pack, the refrigerant absorbs the heat through the heat exchanger 1, so that the temperature of the cooling liquid in the loop is reduced.

Further, by providing the refrigerant circuit between the heat exchanger 1 and the condenser 4, waste heat recovery of the heat exchanger 1 can be achieved, and when there is excessive heat in the heat exchanger branch 13 where the heat exchanger 1 is located, heat can be transferred to the condenser 4 located in the passenger compartment heating branch through the refrigerant circuit, and heat transfer and circulation can be promoted more.

As shown in fig. 5, in some embodiments, the circuit through which the refrigerant flows is further provided with an evaporator 9 and an outdoor heat exchanger 14.

Specifically, the evaporator 9 is located inside the passenger compartment, and the outdoor heat exchanger 14 is located outside the passenger compartment. The refrigerant circuit shown in fig. 5 enables heating or cooling of the passenger compartment.

The refrigerant loop heats the passenger cabin by heating the condenser 4, and the working principle is as follows:

1. the heat exchanger 1 absorbs the heat in the heat exchanger branch 13 to the refrigerant loop, and can transfer the heat to the condenser 4 in the passenger cabin heating branch 12;

2. the outdoor environment warms the condenser 4, and the outdoor heat exchanger 14 transfers heat to the condenser 4 through the refrigerant circuit by absorbing the temperature of the external environment.

The refrigerating of the passenger cabin by the refrigerant loop is realized by cooling the evaporator 9, and the working principle is as follows: the refrigerant flowing through the outdoor heat exchanger 14 enters the evaporator 9, the evaporator 9 absorbs heat from the environment to evaporate the refrigerant, and the evaporator 9 is located in the passenger compartment, thereby realizing the cooling of the passenger compartment.

Therefore, in the working

conditions

1 and 2, the passenger cabin is in a heating state under the action of the cooling liquid loop, dehumidification of the passenger cabin of the automobile can be realized through the refrigerant circulation loop, and dehumidification of the passenger cabin is completed through the refrigerant circulation. The dehumidification principle is as follows: the refrigerant flowing through the evaporator 9 absorbs heat in the passenger compartment through the evaporator 9, thereby achieving the effect of cooling the condenser 4. Therefore, the passenger cabin is heated by the heat pump, and is refrigerated by the evaporator 9, so that the dehumidification purpose can be achieved.

The refrigerant and the cooling liquid in the present application are different mediums and serve different functions. Specifically, the refrigerant generally refers to a refrigerant, which is a working substance that achieves an active cooling effect by changing its state; the cooling liquid is usually a mixture of water and glycol, etc., which is a medium for passive heat exchange.

In some embodiments, the warm air core 6 is assembled with the evaporator 9, and a blower is arranged at the warm air core 6;

the blower, the warm air core 6 and the evaporator 9 are arranged in the passenger cabin;

the blower is used for accelerating the air passing through the warm air core 6 and the evaporator to realize heat exchange.

In some embodiments, a condensing fan is provided at the low-temperature radiator 3;

the condensing fan is used for assisting in heat dissipation.

Through setting up the air-blower, strengthened the circulation of air in the car passenger cabin to in operating mode 1, can also realize the blowing of car passenger cabin, in operating mode 2, can also realize the dehumidification of car passenger cabin.

Referring to fig. 6, in some embodiments in which the multi-way valve is an eight-way valve, the C1-to-C8-ports are arranged in a nine-way format to save space required for the eight-way valve. Corresponding to the specific position of the Sudoku, the C1 interface is positioned in the first column of the second row, the C2 interface is positioned in the first column of the third row, the C3 interface is positioned in the second column of the second row, the C4 interface is positioned in the second column of the third row, the C5 interface is positioned in the third column of the third row, the C6 interface is positioned in the second column of the first row, the C7 interface is positioned in the third column of the first row, and the C8 interface is positioned in the third column of the second row. The interfaces of the first row and the first column can be communicated with other interfaces, so that the connection mode of the eight-way valve can be expanded.

Referring to FIG. 7, in some embodiments, the C1-C8 interface is specifically connected as shown in FIG. 7.

In some embodiments, the flow channel plate comprises a plurality of flow channels for conveying cooling liquid, the flow channels are mutually parallel, one ends of the flow channels are connected with the multi-way valve, and the other ends of the flow channels are connected with the corresponding heat exchanger 1, the motor electric control cooling device 2, the low-temperature radiator 3, the condenser 4, the water heating PTC5, the warm air core 6 or the power battery pack 7.

The invention also provides an automobile, and a multi-way valve heat management system adopting any one of the above.

The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims

1. The multi-way valve thermal management system comprises a heat exchanger (1), a motor electric control cooling device (2), a low-temperature radiator (3), a condenser (4), a water heating PTC (5), a warm air core body (6) and a power battery pack (7); the method is characterized in that:

the heat exchanger (1), the motor electric control cooling device (2), the low-temperature radiator (3), the condenser (4), the water heating PTC (5), the warm air core (6) and the power battery pack (7) are all connected with the multi-way valve through flow passage plates to form a loop for circulating cooling liquid;

the multi-way valve comprises at least one movable valve core, and the communication among a plurality of pipelines is switched or closed through the movable valve core;

the motor electric control cooling device (2), the low-temperature radiator (3) and the multi-way valve are connected in series to form a motor electric control branch circuit (10);

the heat exchanger (1) is connected with the multi-way valve in series to form a heat exchanger branch (13);

the power battery pack (7) is connected with the multi-way valve in series to form a battery branch (11);

the condenser (4), the water heating PTC (5), the warm air core (6) and the multi-way valve are connected in series to form a passenger cabin heating branch (12);

the heat exchanger branch (13) and the motor electric control branch (10) are communicated with each other through the multi-way valve to form a first loop;

the passenger cabin heating branch circuit (12) and the battery branch circuit (11) are communicated with each other through the multi-way valve to form a second loop;

wherein the passenger cabin heating branch comprises two parallel short-circuit pipelines (15) at one side connected with the multi-way valve;

of the two short-circuit lines (15), at least one short-circuit line (15) can be closed by a first proportional three-way valve (16).

2. The multi-way valve thermal management system of claim 1, wherein the multi-way valve comprises a C1 interface, a C2 interface, a C3 interface, a C4 interface, a C5 interface, a C6 interface, a C7 interface, and a C8 interface; the C1 interface and the C2 interface are respectively abutted to the outlet and the inlet of the passenger cabin heating branch circuit (12), the C3 interface and the C4 interface are respectively abutted to the inlet and the outlet of the battery branch circuit (11), the C5 interface and the C6 interface are respectively corresponding to the inlet and the outlet of the heat exchanger branch circuit (13), the C7 interface and the C8 interface are respectively corresponding to the inlet and the outlet of the motor electric control branch circuit (10), wherein the C1 interface and the C3 interface are mutually communicated, the C2 interface and the C4 interface are mutually communicated, the C6 interface and the C7 interface are mutually communicated, and the C5 interface and the C8 interface are mutually communicated.

3. The multi-way valve thermal management system according to claim 2, characterized in that between the C1 interface and the condenser (4) a connection is made by means of a plurality of three-way connections provided at the location where the condenser (4) is connected to two of the short-circuit lines (15);

and the connection between the C2 interface and the warm air core body (6) is realized by arranging a plurality of tee joints at the connection position of the warm air core body (6) and the two short circuit pipelines (15).

4. The multi-way valve thermal management system according to claim 1, wherein the motor electric control branch (10), the battery branch (11) and the passenger compartment heating branch (12) are each provided with a coolant circulation water pump (8).

5. Multi-way valve thermal management system according to claim 1, characterized in that a circuit for the flow of refrigerant is provided between the heat exchanger (1) and the condenser (4);

when the passenger cabin heating branch circuit (12) is in a passenger cabin heating or dehumidifying working condition, heat comes from the condenser (4), and if the heat is insufficient, the water heating PTC (5) works to heat the cooling liquid in the passenger cabin heating branch circuit (12) so as to meet the requirement of warm air;

the refrigerant transfers the carried heat through the condenser (4) to the cooling liquid of the passenger compartment heating branch (12).

6. A multi-way valve thermal management system according to claim 5, wherein said circuit through which said refrigerant flows is provided with an evaporator (9), said warm air core (6) being integral with said evaporator (9) and provided with a blower; and/or the loose path flowing through the refrigerant is provided with an outdoor heat exchanger (14);

the blower, the warm air core (6) and the evaporator (9) are arranged in the passenger cabin; the blower is used for accelerating air passing through the warm air core (6) and the evaporator to realize heat exchange.

7. The multi-way valve thermal management system according to claim 1, wherein the low-temperature radiator (3) is connected in parallel with a second proportional three-way valve (17), so that the motor electric control branch (10) has a bypass effect, and the corresponding flow of the cooling liquid is distributed through the second proportional three-way valve (17).

8. The multi-way valve thermal management system according to claim 1, characterized in that a condensing fan is provided at the low temperature radiator (3);

a blower is arranged at the warm air core (6), and the blower and the warm air core (6); the blower is used for accelerating air passing through the warm air core body (6) to realize heat exchange.

9. The multi-way valve thermal management system according to claim 1, wherein the runner plate comprises a plurality of runners for conveying cooling liquid, the runners are arranged in parallel with each other, one ends of the runners are connected with the multi-way valve, and the other ends of the runners are connected with the corresponding heat exchanger (1), the motor electric control cooling device (2), the low-temperature radiator (3), the condenser (4), the water heating PTC (5), the warm air core (6) or the power battery pack (7).

10. An automobile, characterized in that a multi-way valve thermal management system according to any one of claims 1 to 9 is employed.