CN117227398A - Heat storage type heat pump heat management system and control method - Google Patents

Abstract

The application discloses a heat storage type heat pump heat management system and a control method, and belongs to the field of automobile heat management systems. The application adopts the technical scheme that the heat accumulating type heat pump heat management system comprises an air conditioner refrigerant loop, a power battery cooling liquid loop and a motor cooling circulation loop; the application transfers the heat of the passenger cabin or the power battery to the external environment through the outdoor condenser in summer, the energy consumption of the compressor is low and the efficiency is high during energy transfer, when the electric vehicle is charged in winter, the electric vehicle is charged by utilizing the characteristic that the power battery has the charging current which is required to be reduced along with the increase of the SOC and the charging power which can be provided by the charging pile is unchanged, the electric quantity is stored in the cooling liquid, the power battery, the second auxiliary water tank and the motor in the form of heat, and after the electric vehicle is charged, the heat is transferred to the passenger cabin in the modes of a primary energy transfer mode and a secondary energy transfer mode, so that the problem of excessively using the electric quantity of the power battery is avoided, and the driving range of the electric vehicle is improved.

Description

Heat storage type heat pump heat management system and control method

Technical Field

The application belongs to the technical field of automobile heat management systems, and particularly relates to a heat accumulating type heat pump heat management system and a control method.

Background

Along with the enhancement of the popularization of new energy vehicles by the state, pure electric vehicle types are more and more popular in daily production and life, but compared with the use experience of customers in summer, the discharge capacity of a power battery is reduced in winter, the electric quantity consumed by the heating working condition of a passenger cabin is increased, and key indexes such as the endurance mileage, the charging time and the like of the vehicles are comprehensively influenced by the factors, so that the customers complain about the full weather adaptability of the electric vehicles. The heat transfer from high temperature to low temperature is comparatively easy, but prior art scheme is in summer with passenger cabin or battery's heat transfer to the motor return circuit of high temperature through liquid cooling condenser, has the problem that COP is low. In terms of transfer efficiency, the compressor has low energy consumption and high efficiency when being transferred to the ambient temperature.

When charging in winter, the prior art scheme transfers the heat of the motor to the power battery through a motor, a battery cooler, a liquid cooling condenser, an expansion kettle and a power battery loop which are connected in series; at the same time, the self-circulation of the compressor is started, and heat is led into the loop through the liquid cooling condenser loop. This solution requires a longer time for the battery to heat up under the same boundary conditions, as all the water, including the expansion jug, needs to be heated up; meanwhile, after the battery temperature is proper, on the premise that heat is not transferred to the passenger cabin, more heat cannot be stored.

Disclosure of Invention

The application provides a heat storage type heat pump heat management system and a control method, which aim to solve at least one of the technical problems.

The technical scheme adopted by the application is as follows:

a heat accumulating type heat pump heat management system comprises an air conditioner refrigerant loop, a power battery cooling liquid loop and a motor cooling circulation loop;

the air conditioner refrigerant loop comprises a first electronic expansion valve, an outdoor condenser, a first refrigerant sensor, a second electronic expansion valve, a battery cooler, a second refrigerant sensor, a gas-liquid separator, a compressor and an HVAC which are sequentially connected in series through a closed pipeline, wherein a first shunt pipeline and a second shunt pipeline are connected in parallel in the air conditioner refrigerant loop, a first stop valve is arranged on the first shunt pipeline, and a second stop valve is arranged on the second shunt pipeline;

the power battery cooling liquid loop comprises a second water pump, a battery cooler, a second water temperature sensor, a power battery, a third water temperature sensor and a four-way valve which are connected in series through a closed pipeline;

the motor cooling circulation loop comprises a first water pump, an all-in-one controller, a motor, a first water temperature sensor, a three-way valve, a motor radiator assembly and a four-way valve which are sequentially connected in series through a closed pipeline, wherein the motor cooling circulation loop is connected with a circulation bypass in parallel through the three-way valve, the circulation bypass is connected with the battery cooler in series, and the two sides of the circulation bypass, which are positioned on the battery cooler, are respectively provided with a first one-way valve and a second one-way valve.

Preferably, the system further comprises a thermal management controller and an outdoor temperature sensor, wherein the thermal management controller is used for controlling the first electronic expansion valve, the second water pump, the four-way valve, the first water pump and the three-way valve to be opened or closed according to the temperatures of the outdoor temperature sensor, the first refrigerant sensor, the second refrigerant sensor, the first water temperature sensor, the second water temperature sensor and the third water temperature sensor.

Preferably, the motor cooling circulation loop is connected with the first auxiliary water tank through a branch pipe.

Preferably, the power battery cooling liquid loop is connected with a second auxiliary water tank through a branch pipeline.

A control method of a heat storage type heat pump heat management system specifically comprises the following steps:

s1, receiving temperatures detected by an outdoor temperature sensor, a first refrigerant sensor, a second refrigerant sensor, a first water temperature sensor, a second water temperature sensor and a third water temperature sensor through a thermal management controller, wherein the thermal management controller controls a first electronic expansion valve, a second water pump, a four-way valve, a first water pump and a three-way valve to be opened or closed;

s2, when the temperature detected by the outdoor temperature sensor is less than 25 ℃, the low temperature of the power battery is less than 35 ℃, the high and low temperature difference between the second water temperature sensor and the third water temperature sensor is within 5-15 ℃, and the whole vehicle is in a charging state, the heat accumulating type heat pump heat management system enters a low-temperature charging mode, and the heat management controller controls the first electronic expansion valve to be closed, the second stop valve to be opened, the second electronic expansion valve to be opened, and the three-way valve to be constantly in an opening state;

s3, when the low temperature of the power battery is less than 0 ℃ and the high temperature is less than 5 ℃, the motor is in a high-power self-heating mode, the heat management controller controls the second water pump to be not operated, the first water pump to be operated, the four-way valve is opened, and at the moment, cooling liquid circulates among the first water pump, the all-in-one controller, the motor, the first water temperature sensor, the three-way valve, the battery cooler, the water temperature sensor, the power battery, the third water temperature sensor and the four-way valve;

s4, when the low temperature of the power battery is more than 55 ℃ or the high temperature of the power battery is more than 10 ℃, the heat management controller limits the self-heating power of the motor according to the water outlet temperature of the first water temperature sensor;

s5, when the state of charge of the power battery is more than 98%, the heat management controller controls the second water pump to be started, the four-way valve to be closed, and the BMS is requested to increase the current required by the heat storage mode as the total current on the basis of the charging current, the heat management controller adjusts the self-heating mode of the motor according to the rising difference value of the second water temperature sensor and the third water temperature sensor in each minute, and at the moment, cooling liquid in the motor cooling circulation loop circulates among the first water pump, the all-in-one controller, the motor, the first water temperature sensor, the three-way valve, the battery cooler, the second one-way valve and the four-way valve, and the cooling liquid in the power battery cooling liquid loop flows to the second water pump, the battery cooler, the second water temperature sensor, the power battery, the third water temperature sensor and the four-way valve;

s6, when a heating request is made to the passenger cabin, the flow direction of the air conditioner refrigerant loop is a compressor, an HVAC, a second stop valve, a first refrigerant sensor, a second electronic expansion valve, a battery cooler, a second refrigerant sensor and a gas-liquid separator;

s7, the low-temperature quick-charge thermal management system enters a driving mode, a first-stage energy transfer mode is entered at the moment, the power battery and the heat stored in a power battery cooling liquid loop are transferred to a passenger cabin, then a thermal management controller controls a four-way valve to be closed, a three-way valve to be opened, a second water pump to work, cooling liquid in the power battery cooling liquid loop circulates among the second water pump, a battery cooler, a second water temperature sensor, the power battery, a third water temperature sensor and the four-way valve, and in the process of transferring the heat from the power battery to the passenger cabin, if the temperature detected by the first water temperature sensor is higher than the low temperature +5 ℃ of the power battery, a motor cooling circulation loop enters a second-stage energy transfer mode to transfer the heat to the passenger cabin;

and S8, transferring heat stored in the motor cooling circulation loop to the passenger cabin in a secondary energy transfer mode, wherein cooling liquid circulates among the first water pump, the all-in-one controller, the motor, the first water temperature sensor, the three-way valve, the battery cooler, the second one-way valve and the four-way valve, and the second water pump in the secondary energy transfer mode is required to be in a low-power mode so as to prevent hot water in the motor cooling circulation loop from being separated by the power battery.

Preferably, the vehicle further comprises a passenger cabin heating mode after the vehicle is frozen, wherein the passenger cabin is heated by the compressor in the passenger cabin heating mode, and the heat of the motor firstly heats the power battery.

Preferably, the motor also comprises a passenger cabin defrosting mode, and the motor is self-heated in the passenger cabin defrosting mode and transfers heat of the motor to the passenger cabin through the battery cooler.

Preferably, when driving in summer, the HVAC and the power battery directly radiate heat of the passenger cabin and the power battery to the environment through the outdoor condenser, and heat of the motor and the all-in-one controller is radiated to the environment through the motor radiator assembly.

Preferably, in step S5, the second auxiliary water tank increases in temperature during the circulation of the coolant in the power battery coolant circuit, so as to store more energy in the whole vehicle.

Preferably, in step S5, the thermal management controller adjusts the self-heating mode of the motor according to the difference between the water temperature sensor and the water temperature sensor rising in each minute, and the principle that the larger the difference is, the larger the self-heating power is.

By adopting the technical scheme, the application has the following beneficial effects:

1. according to the technical scheme, heat of the passenger cabin or the power battery is transferred to the external environment through the outdoor condenser in summer, and the energy consumption of the compressor is low and the efficiency is high during energy transfer.

2. In a preferred embodiment of the present application, the power battery has a characteristic that the charging current required for the charging pile is reduced as the SOC increases and the charging power that the charging pile can supply is constant during the winter charging, and the electric power is stored in the form of heat in the coolant, the power battery, the second sub-tank, and the motor. After charging, heat is transferred to the passenger cabin in a primary energy transfer mode and a secondary energy transfer mode, so that the problem of excessive use of the electric quantity of the power battery is avoided, and the driving range of the whole vehicle is improved.

3. As a preferred implementation mode of the application, when defrosting in winter, the heat of the motor can be directly transferred to the passenger cabin without a battery, and the temperature of the passenger cabin rises quickly.

Drawings

FIG. 1 is a block diagram of a whole vehicle thermal management system according to the present application;

FIG. 2 is a schematic block diagram of a low-temperature fast-charging and heat-accumulating mode thermal management system of the power battery;

FIG. 3 is a schematic block diagram of a low temperature fast charge mode thermal management system for a power battery according to the present application;

FIG. 4 is a schematic block diagram of a thermal management system in a passenger compartment heating mode of the present application;

FIG. 5 is a schematic block diagram of a thermal management system in a defrost mode of the present application;

FIG. 6 is a schematic block diagram of a summer driving thermal management system according to the present application.

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application.

In the drawings:

1. an outdoor temperature sensor; 2. a first electronic expansion valve; 3. an outdoor condenser; 4. a motor radiator assembly; 5. a first sub tank; 6. a first refrigerant sensor; 7. a second electronic expansion valve; 8. a four-way valve; 9. a first water pump; 10. an all-in-one controller; 11. a motor; 12. a first water temperature sensor; 13. a three-way valve; 14. a first one-way valve; 15. a second water temperature sensor; 16. a power battery; 17. a third water temperature sensor; 18. a second water pump; 19. a battery cooler; 20. a second auxiliary water tank; 21. a second one-way valve; 22. a first stop valve; 23. HVAC; 24. a second refrigerant sensor; 25. a gas-liquid separator; 26. a compressor; 27. and a second shut-off valve.

Detailed Description

In order to more clearly illustrate the general inventive concept, a detailed description is given below by way of example with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, the descriptions of the terms "implementation," "embodiment," "one embodiment," "example," or "particular example" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1-6, a heat storage type heat pump thermal management system comprises an air conditioner refrigerant loop, a power battery cooling liquid loop and a motor cooling circulation loop; the air conditioner refrigerant loop comprises a first electronic expansion valve 2, an outdoor condenser 3, a first refrigerant sensor 6, a second electronic expansion valve 7, a battery cooler 19, a second refrigerant sensor 24, a gas-liquid separator 25, a compressor 26 and an HVAC23 which are sequentially connected in series by closed pipelines, wherein a first shunt pipeline and a second shunt pipeline are connected in parallel in the air conditioner refrigerant loop, a first stop valve 22 is arranged on the first shunt pipeline, and a second stop valve 27 is arranged on the second shunt pipeline; the power battery cooling liquid loop comprises a second water pump 18, a battery cooler 19, a second water temperature sensor 15, a power battery 16, a third water temperature sensor 17 and a four-way valve 8 which are connected in series by closed pipelines; the motor cooling circulation loop comprises a first water pump 9, an all-in-one controller 10, a motor 11, a first water temperature sensor 12, a three-way valve 13, a motor radiator assembly 4 and a four-way valve 8 which are sequentially connected in series through a closed pipeline, wherein the motor cooling circulation loop is connected with a circulation bypass in parallel through the three-way valve 13, the circulation bypass is connected with a battery cooler 19 in series, and the two sides of the circulation bypass, which are positioned on the battery cooler 19, are respectively provided with a first one-way valve 14 and a second one-way valve 21.

The outdoor temperature sensor 1 is used for controlling the opening or closing of the first electronic expansion valve 2, the second electronic expansion valve 7, the second water pump 18, the four-way valve 8, the first water pump 9 and the three-way valve 13 according to the temperatures of the outdoor temperature sensor 1, the first refrigerant sensor 6, the second refrigerant sensor 24, the first water temperature sensor 12, the second water temperature sensor 15 and the third water temperature sensor 17.

The motor cooling circulation loop is connected with a first auxiliary water tank 5 through a branch pipe, and the power battery cooling liquid loop is connected with a second auxiliary water tank 20 through a branch pipe. The provision of the first sub water tank 5 and the second sub water tank 20 facilitates the supply of water to the vehicle while also storing and reusing the heat in each coolant circulation circuit.

The outdoor temperature sensor 1, the first refrigerant sensor 6, the second refrigerant sensor 24, the first water temperature sensor 12, the second water temperature sensor 15 and the third water temperature sensor 17 are used for detecting temperatures, the thermal management controller controls the first electronic expansion valve 2, the second electronic expansion valve 7, the second water pump 18, the four-way valve 8, the first water pump 9 and the three-way valve 13 to be opened or closed, when the outdoor temperature sensor 1 detects the temperature less than 25 ℃, the low temperature of the power battery 16 is less than 35 ℃, the high and low temperature difference between the second water temperature sensor 15 and the third water temperature sensor 17 is within 5-15 ℃, and meanwhile, when the whole vehicle is in a charging state, the heat accumulating type heat pump thermal management system enters a low-temperature charging mode, and the thermal management controller controls the first electronic expansion valve 2 to be closed, the second stop valve 27 to be opened, the second electronic expansion valve 7 to be opened and the three-way valve 13 to be constantly in an opened state.

As a specific embodiment of the present application, referring to fig. 1 to 3, when the low temperature of the power battery 16 is less than 0 ℃ and the high temperature is less than 5 ℃, the motor 11 is in a high-power self-heating mode, the thermal management controller controls the second water pump 18 to be not operated, the first water pump 9 to be operated, the four-way valve 8 to be opened, and at this time, the cooling liquid circulates among the first water pump 9, the all-in-one controller 10, the motor 11, the first water temperature sensor 12, the three-way valve 13, the battery cooler 19, the water temperature sensor 15, the power battery 16, the third water temperature sensor 17 and the four-way valve 8.

When the low temperature of the power battery 16 is more than 55 ℃ or the high temperature of the power battery 16 is more than 10 ℃, the thermal management controller limits the self-heating power of the motor 11 according to the water outlet temperature of the first water temperature sensor 12.

When the state of charge of the power battery 16 is greater than 98%, the thermal management controller controls the second water pump 18 to be started, closes the four-way valve 8, and requests the BMS to increase the current required by the heat storage mode as the total current based on the charging current, the thermal management controller adjusts the self-heating mode of the motor 11 according to the rising difference value of the second water temperature sensor 15 and the third water temperature sensor 17 in each minute, at this time, the cooling liquid in the cooling circulation loop of the motor circulates among the first water pump 9, the all-in-one controller 10, the motor 11, the first water temperature sensor 12, the three-way valve 13, the battery cooler 19, the second one-way valve 21 and the four-way valve 8, the cooling liquid flow direction in the cooling liquid loop of the power battery is the second water pump 18, the battery cooler 19, the second water temperature sensor 15, the power battery 16, the third water temperature sensor 17 and the four-way valve 8, the temperature of the second auxiliary water tank 20 rises in the cooling liquid circulation process of the power battery, the purpose of enabling the whole vehicle to store more energy is achieved, and the self-heating mode is required to be greater according to the rising difference value of the temperature difference value of the water temperature sensor 15 and the temperature sensor 17 in each minute.

When the passenger cabin has a heating request, the flow direction of the air-conditioning refrigerant loop is a compressor 26, an HVAC23, a second stop valve 27, a first refrigerant sensor 6, a second electronic expansion valve 7, a battery cooler 19, a second refrigerant sensor 24 and a gas-liquid separator 25.

The low-temperature quick-charging post-heat management system enters a driving mode, a primary energy transfer mode is entered at the moment, heat stored in a power battery 16 and a power battery cooling liquid loop is transferred to a passenger cabin, then a heat management controller controls a four-way valve 8 to be closed, a three-way valve 13 to be opened, a second water pump 18 to work, cooling liquid in the power battery cooling liquid loop circulates among the second water pump 18, a battery cooler 19, a second water temperature sensor 15, the power battery 16, a third water temperature sensor 17 and the four-way valve 8, and in the process of transferring heat from the power battery 16 to the passenger cabin, if the temperature detected by the first water temperature sensor 12 is more than the low temperature +5 ℃ of the power battery 16, a motor cooling circulation loop enters a secondary energy transfer mode to transfer heat to the passenger cabin.

In the secondary energy transfer mode, the heat stored in the motor cooling circulation loop is transferred to the passenger cabin, the cooling liquid circulates among the first water pump 9, the all-in-one controller 10, the motor 11, the first water temperature sensor 12, the three-way valve 13, the battery cooler 19, the second one-way valve 21 and the four-way valve 8, and the second water pump 18 in the secondary energy transfer mode needs to be in a low-power mode so as to avoid the hot water in the motor cooling circulation loop from being separated by the power battery 16.

The above embodiment also includes the following examples:

example 1: referring to fig. 4, the thermal management system after the vehicle is frozen goes into a passenger compartment heating mode in which the passenger compartment is heated by the compressor 26 and the heat of the motor 11 first heats the power battery 16.

Example 2: referring to fig. 5, after the frosting phenomenon occurs in the vehicle, the passenger compartment enters a defrost mode in which the motor 11 transfers heat of the motor 11 to the passenger compartment through the battery cooler 19 by self-heating.

Example 3: referring to fig. 6, during driving in summer, the HVAC23 and the power battery 16 directly radiate heat of the passenger compartment and the power battery 16 to the environment through the outdoor condenser 3, and heat of the motor 11 and the all-in-one controller 10 is radiated to the environment through the motor radiator assembly 4.

According to the technical scheme, in summer, heat of the passenger cabin or the power battery 16 is transferred to the external environment through the outdoor condenser 3, and the energy consumption of the compressor 26 is low and the efficiency is high during energy transfer.

In the winter charging, the electric power is stored in the form of heat in the coolant, the power battery 16, the second sub-tank 20 and the motor 11 by utilizing the characteristic that the charging current required by the power battery 16 increases with the SOC becomes smaller and the charging power that can be provided by the charging pile is unchanged. After charging, heat is transferred to the passenger cabin in a primary energy transfer mode and a secondary energy transfer mode, so that the problem of excessive use of the electric quantity of the power battery 16 is avoided, and the driving range of the whole vehicle is improved.

When defrosting in winter, the heat of the motor 11 can be directly transferred to the passenger cabin without a battery, and the temperature of the passenger cabin rises quickly.

The application can be realized by adopting or referring to the prior art at the places which are not described in the application.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims (10)

1. The heat accumulating type heat pump heat management system is characterized by comprising an air conditioner refrigerant loop, a power battery cooling liquid loop and a motor cooling circulation loop;

the air conditioner refrigerant loop comprises a first electronic expansion valve (2), an outdoor condenser (3), a first refrigerant sensor (6), a second electronic expansion valve (7), a battery cooler (19), a second refrigerant sensor (24), a gas-liquid separator (25), a compressor (26) and an HVAC (23), wherein the first electronic expansion valve, the outdoor condenser (3), the first refrigerant sensor (6), the second electronic expansion valve, the battery cooler (19), the second refrigerant sensor (24), the gas-liquid separator (25), the compressor (26) and the HVAC (23) are sequentially connected in series through closed pipelines, a first shunt pipeline and a second shunt pipeline are connected in parallel in the air conditioner refrigerant loop, a first stop valve (22) is arranged on the first shunt pipeline, and a second stop valve (27) is arranged on the second shunt pipeline;

the power battery cooling liquid loop comprises a second water pump (18), a battery cooler (19), a second water temperature sensor (15), a power battery (16), a third water temperature sensor (17) and a four-way valve (8) which are connected in series through closed pipelines;

the motor cooling circulation loop comprises a first water pump (9), an all-in-one controller (10), a motor (11), a first water temperature sensor (12), a three-way valve (13), a motor radiator assembly (4) and a four-way valve (8) which are sequentially connected in series through a closed pipeline, wherein the motor cooling circulation loop is connected with a circulation bypass in parallel through the three-way valve (13), the circulation bypass and a battery cooler (19) are arranged in series, and the two sides of the circulation bypass, which are positioned on the battery cooler (19), are respectively provided with a first one-way valve (14) and a second one-way valve (21).

2. The heat storage type heat pump heat management system according to claim 1, further comprising a heat management controller and an outdoor temperature sensor (1), wherein the heat management controller is used for controlling the first electronic expansion valve (2), the second electronic expansion valve (7), the second water pump (18), the four-way valve (8), the first water pump (9) and the three-way valve (13) to be opened or closed according to the outdoor temperature sensor (1), the first refrigerant sensor (6), the second refrigerant sensor (24), the first water temperature sensor (12), the second water temperature sensor (15) and the third water temperature sensor (17).

3. A regenerative heat pump thermal management system according to claim 2, wherein the motor cooling circulation loop is connected to the first auxiliary water tank (5) through a branch pipe.

4. A regenerative heat pump thermal management system according to claim 3, wherein the power cell coolant circuit is connected to a second auxiliary water tank (20) through a branch pipe.

5. A control method of a heat storage type heat pump heat management system, characterized in that the heat storage type heat pump heat management system according to claim 4 is adopted, and specifically comprises the following steps:

s1, receiving temperatures detected by an outdoor temperature sensor (1), a first refrigerant sensor (6), a second refrigerant sensor (24), a first water temperature sensor (12), a second water temperature sensor (15) and a third water temperature sensor (17) through a thermal management controller, wherein the thermal management controller controls a first electronic expansion valve (2), a second electronic expansion valve (7), a second water pump (18), a four-way valve (8), a first water pump (9) and a three-way valve (13) to be opened or closed;

s2, when the outdoor temperature sensor (1) detects that the temperature is less than 25 ℃, the low temperature of the power battery (16) is less than 35 ℃, the high and low temperature difference between the second water temperature sensor (15) and the third water temperature sensor (17) is within 5-15 ℃, and the whole vehicle is in a charging state, the heat accumulating type heat pump heat management system enters a low-temperature charging mode, and the heat management controller controls the first electronic expansion valve (2) to be closed, the second stop valve (27) to be opened, the second electronic expansion valve (7) to be opened, and the three-way valve (13) to be constantly in an opening state;

s3, when the low temperature of the power battery (16) is less than 0 ℃ and the high temperature is less than 5 ℃, the motor (11) is in a high-power self-heating mode, the heat management controller controls the second water pump (18) to be not operated, the first water pump (9) to be operated, the four-way valve (8) to be opened, and at the moment, cooling liquid circulates among the first water pump (9), the all-in-one controller (10), the motor (11), the first water temperature sensor (12), the three-way valve (13), the battery cooler (19), the water temperature sensor (15), the power battery (16), the third water temperature sensor (17) and the four-way valve (8);

s4, when the low temperature of the power battery (16) is more than 55 ℃ or the high temperature of the power battery (16) is more than 10 ℃, the heat management controller limits the self-heating power of the motor (11) according to the water outlet temperature of the first water temperature sensor (12);

s5, when the charge state of the power battery (16) is more than 98%, the heat management controller controls the second water pump (18) to be started, the four-way valve (8) to be closed, and requests the BMS to increase the current required by a heat storage mode as the total current on the basis of charging current, and adjusts the self-heating mode of the motor (11) according to the rising difference value of the second water temperature sensor (15) and the third water temperature sensor (17) in each minute, and at the moment, cooling liquid in the motor cooling circulation loop circulates among the first water pump (9), the all-in-one controller (10), the motor (11), the first water temperature sensor (12), the three-way valve (13), the battery cooler (19), the second one-way valve (21) and the four-way valve (8), wherein the cooling liquid in the power battery cooling liquid loop flows to the second water pump (18), the battery cooler (19), the second water temperature sensor (15), the power battery (16), the third water temperature sensor (17) and the four-way valve (8);

s6, when a heating request is made to the passenger cabin, the flow direction of the air conditioner refrigerant loop is a compressor (26), an HVAC (23), a second stop valve (27), a first refrigerant sensor (6), a second electronic expansion valve (7), a battery cooler (19), a second refrigerant sensor (24) and a gas-liquid separator (25);

s7, a low-temperature quick-charge thermal management system enters a driving mode, a first-stage energy transfer mode is entered at the moment, heat stored in a power battery (16) and a power battery cooling liquid loop is transferred to a passenger cabin, then a thermal management controller controls a four-way valve (8) to be closed, a three-way valve (13) to be opened and a second water pump (18) to work, cooling liquid in the power battery cooling liquid loop circulates among the second water pump (18), a battery cooler (19), a second water temperature sensor (15), the power battery (16), a third water temperature sensor (17) and the four-way valve (8), and in the process of transferring heat from the power battery (16) to the passenger cabin, if the temperature detected by the first water temperature sensor (12) is more than the low temperature +5 ℃, the motor cooling circulation loop enters a second-stage energy transfer mode to transfer heat to the passenger cabin;

s8, in a secondary energy transfer mode, heat stored in a motor cooling circulation loop is transferred to a passenger cabin, cooling liquid circulates among a first water pump (9), an all-in-one controller (10), a motor (11), a first water temperature sensor (12), a three-way valve (13), a battery cooler (19), a second one-way valve (21) and a four-way valve (8), and in the secondary energy transfer mode, the second water pump (18) needs to be in a low-power mode so as to avoid hot water in the motor cooling circulation loop from being separated by a power battery (16).

6. The control method of a regenerative heat pump thermal management system according to claim 5, further comprising a passenger compartment heating mode after the vehicle is frozen, wherein the passenger compartment is heated by the compressor (26) in the passenger compartment heating mode, and the heat of the motor (11) first heats the power battery (16).

7. The control method of a regenerative heat pump thermal management system according to claim 5, further comprising a passenger compartment defrost mode in which the motor (11) transfers heat from the motor (11) to the passenger compartment via the battery cooler (19) by self-heating.

8. The control method of a heat storage type heat pump heat management system according to claim 5, wherein the HVAC (23) and the power battery (16) directly radiate heat of the passenger compartment and the power battery (16) to the environment through the outdoor condenser (3) when driving in summer, and heat of the motor (11) and the all-in-one controller (10) is radiated to the environment through the motor radiator assembly (4).

9. The method according to claim 5, wherein in step S5, the second sub-tank (20) is heated during the circulation of the coolant in the power battery coolant circuit, so as to store more energy in the whole vehicle.

10. The method according to claim 5, wherein in step S5, the thermal management controller adjusts the self-heating mode of the motor according to the difference between the water temperature sensor (15) and the water temperature sensor (17) rising in each minute, so as to follow the principle that the larger the difference is, the larger the self-heating power is.