Thermal management system for electric vehicle and control method of thermal management system

Abstract

The invention discloses a thermal management system for an electric vehicle and a control method of the thermal management system. The thermal management system comprises a cooling liquid loop, a refrigerant loop and a thermal management controller. The cooling liquid loop comprises a multi-way valve module, an electric drive cooling liquid loop, a cabin cooling liquid loop, a battery cooling liquid loop and a radiator cooling liquid loop; the two ends of the electric drive cooling liquid loop, the two ends of the battery cooling liquid loop and the two ends of the radiator cooling liquid loop are connected with all connectors of the multi-way valve module respectively. The cabin cooling liquid loop comprises a first condenser, the radiator cooling liquid loop comprises a second condenser, and the refrigerant loop flows through the first condenser and the second condenser through the first valve to the sixth valve and then flows through the evaporator and the cooler. The control mode of the heat management controller at least comprises a first heating mode, the first heating mode achieves that the heat pump only takes heat from the electric drive and is used for the cabin or the battery pack, and the problem that the temperature of the battery is too low due to the fact that the heat pump must absorb heat from the battery and the electric drive at the same time is solved.

Description

Technical Field

[0001] The present application relates to the technical field of thermal management systems for electric vehicles, and in particular, to a thermal management system for electric vehicles and a control method thereof. Background Art

[0002] With the continuous development of new energy vehicles, thermal management systems have become more and more complex. Thermal management systems often use three-way valves, four-way valves or other water valve combinations to achieve switching between different pipelines. However, multiple water valves lead to multiple water pipe interfaces, complex pipeline connections, and cumbersome corresponding control logic. In addition, the combination of multiple water valves will also lead to a larger overall mass of the thermal management system and a larger assembly space.

[0003] The US patent with publication number US20190070924A1 discloses an electric vehicle heat pump system with extreme temperature heating capability and effective heat pretreatment. The integrated design of the eight-way valve is used to realize the integration of the thermal management system, which helps to reduce costs, reduce weight and reduce assembly space. Among them, the integrated components mainly include: water pump, eight-way valve, battery cooler, liquid-cooled condenser, coolant flow channel plate, refrigerant flow channel plate, etc. On the coolant side, it is connected to nine interfaces through the eight-way valve to realize the switching of various thermal management modes, which helps to reduce the energy consumption of the thermal management system. However, under the heat pump working condition in this patent, it is impossible to absorb the waste heat of the electric drive alone, and it is necessary to absorb heat from the battery and the electric drive at the same time, which easily causes the battery temperature to be too low; in addition, due to the architecture of the indirect heat pump, it is impossible to select the fuel parking heater, and under the cooling condition, there is no special air conditioning cooling mode, which will cause the high energy consumption of the thermal management system in this patent. Summary of the invention

[0004] To solve at least one aspect of the above problems, the present invention provides a thermal management system for an electric vehicle, including a coolant circuit, a refrigerant circuit and a thermal management controller; the coolant circuit includes a multi-way valve module, an electric drive coolant circuit, a cabin coolant circuit, a battery coolant circuit, and a radiator coolant circuit; the multi-way valve module includes at least a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface, an eighth interface and corresponding first valve flaps, second valve flaps, third valve flaps, fourth valve flaps, fifth valve flaps, sixth valve flaps, seventh valve flaps and eighth valve flaps, and the second interface is connected to the fifth interface; the inlet and outlet ends of the electric drive coolant circuit The first interface and the eighth interface are connected respectively; the cabin coolant circuit includes a first condenser; the inlet end and the outlet end of the battery coolant circuit are connected to the sixth interface and the seventh interface respectively. When the electric drive has a heating function, the battery coolant circuit includes a cooler; when the electric drive does not have a heating function, the battery coolant circuit also includes a heat exchanger, and a first three-way valve is provided on the heat exchanger. The inlet end and the first outlet end of the first three-way valve are connected in series to the cabin coolant circuit, and the second outlet end of the first three-way valve is connected to the heat exchanger; the inlet end and the outlet end of the radiator coolant circuit are connected to the third interface, the fourth interface and the fifth interface respectively; the radiator coolant circuit includes a second coolant in series condenser, a second three-way valve and a radiator, the inlet end of the second three-way valve is connected to the second condenser, and the first outlet end and the second outlet end of the second three-way valve are respectively connected to the inlet end and the outlet end of the radiator; the refrigerant circuit comprises a compressor, a first module and a second module connected in series; the first module comprises a first valve, a second valve and a third valve, and a pipeline connected in series between the first valve and the first condenser is connected in parallel with a pipeline connected in series between the second valve, the second condenser and the third valve; the second module comprises an evaporator, a fourth valve and a fifth valve, and a pipeline connected in series between the fourth valve and the evaporator is connected in parallel with a pipeline connected in series between the fifth valve and the cooler; a sixth valve is connected in series between the outlet end of the second valve and the inlet end of the compressor; a thermal management controller is connected to the multi-module The multi-way valve module, the second three-way valve, the first valve, the second valve, the sixth valve, the third valve, the fourth valve and the fifth valve are all electrically connected and are used to control their execution states according to the control mode; the execution mode of the multi-way valve module includes at least the first mode, and the first mode is that the first valve flap is connected to the third valve flap, and the fifth valve flap is connected to the eighth valve flap, and the seventh valve flap is connected to the sixth valve flap; the control mode of the thermal management controller includes at least the first heating mode, and the first heating mode is that the multi-way valve module executes the first mode, the first three-way valve executes the three-way mode, the second three-way valve executes and its inlet end is connected to the second outlet end, the first valve, the third valve and the sixth valve are all opened, and the second valve, the fourth valve and the fifth valve are all closed.

[0005] Through the above technical solution, the inlet and outlet ends of the electric drive coolant circuit, the inlet and outlet ends of the battery coolant circuit, and the inlet and outlet ends of the radiator coolant circuit are respectively connected to the respective interfaces of the multi-way valve module, and the refrigerant circuit is connected to the first condenser in the cabin coolant circuit, the second condenser in the radiator coolant circuit, the evaporator in the air conditioning box, and the cooler in the battery coolant circuit, so as to realize the integration of the thermal management system of the present application; when the thermal management controller executes the first heating mode, the radiator is closed, and the heat of the electric drive passes through the second condenser so that the refrigerant flowing therethrough absorbs heat, and when it flows through the first condenser under the action of the compressor, it is cooled so that the coolant flowing therethrough is heated, and the heated coolant flows through the heater core or the heat exchanger, and when the electric drive has a heating function, the battery coolant circuit is self-circulated, and the heat pump takes heat from the electric drive alone and uses it in the cabin; when the electric drive does not have a heating function, the heat pump takes heat from the electric drive alone and uses it in the cabin and the battery pack, which solves the problem that the heat pump must absorb heat from the battery and the electric drive at the same time, causing the battery temperature to be too low.

[0006] Preferably, the cabin coolant circuit further includes a parking heater, which is connected in series with the heater core. Through the above technical solution, the thermal management system of the present application can be equipped with an optional parking heater, which helps to reduce the endurance degradation in winter.

[0007] Preferably, the multi-way valve includes a second mode, in which the first valve flap is connected to the second valve flap, the fourth valve flap is connected to the third valve flap, the seventh valve flap is connected to the eighth valve flap, and the fifth valve flap is connected to the sixth valve flap; the control mode also includes a second heating mode, in which the multi-way valve module executes the second mode, the first three-way valve executes the three-way mode, the second three-way valve executes its inlet end and is connected to the first outlet end, and the first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are all closed. Through the above technical solution, the radiator coolant circuit and the refrigerant circuit do not work, the electric drive coolant circuit and the battery coolant circuit are connected in series, the parking heater heats the coolant flowing through and then flows through the heater core or heat exchanger, and when the electric drive has a heating function, the electric drive heats the battery and the parking heater heats the cabin; when the electric drive does not have a heating function, the electric drive waste heat heats the battery, the parking heater heats the cabin, and assists in heating the battery.

[0008] Preferably, the control mode also includes a first cooling mode, in which the multi-way valve module executes the second mode, the first three-way valve executes the closed mode, the second three-way valve executes the inlet end connected to the first outlet end, the second valve, the third valve and the fourth valve are all open, and the first valve, the fifth valve and the sixth valve are all closed. Through the above technical solution, the electric drive coolant circuit and the battery coolant circuit are connected in series, the coolant flows through the second condenser to absorb the heat released when the refrigerant flowing through is cooled, and dissipates the heat in the radiator; the cooled refrigerant flows through the evaporator to cool the cabin, realizing single-system water cooling of the air conditioner.

[0009] Preferably, the control mode also includes a third heating mode, in which the multi-way valve module executes the second mode, the first three-way valve and the second three-way valve both execute that their inlet ends are connected to the first outlet end, the first valve, the third valve and the fourth valve are all open, and the second valve, the fifth valve and the sixth valve are all closed. Through the above technical solution, the electric drive coolant circuit and the battery coolant circuit are connected in series; the refrigerant first absorbs the cabin heat through the evaporator inside the cabin, and then releases heat through the first condenser and the heater core; at the same time, the refrigerant passes through the second condenser and exchanges heat with the coolant to absorb heat from the external radiator, so as to realize the heat pump absorbing heat from the coolant circuit for slow cabin defog.

[0010] Preferably, the control mode also includes a fourth heating mode, in which the multi-way valve module and the second three-way valve both execute any mode, the first three-way valve executes its inlet end to be connected with the first outlet end, the first valve and the fourth valve are both open, and the second valve, the third valve, the fifth valve and the sixth valve are all closed. Through the above technical solution, the refrigerant is cooled when flowing through the first condenser so that the coolant flowing therein is heated, the heated coolant flows through the heater core, and the cooled refrigerant flows through the evaporator to absorb heat, which is used for rapid cabin defog.

[0011] Preferably, the control mode also includes a fifth heating mode, in which the multi-way valve module executes the second mode, the first three-way valve and the second three-way valve both execute that their inlet ends are connected to the first outlet end, the first valve, the second valve, the third valve and the fourth valve are all open, and the fifth valve and the sixth valve are both closed. Through the above technical solution, the refrigerant is cooled by the first condenser and the second condenser respectively, and the cooled refrigerant flows to the evaporator; the electric drive coolant circuit and the battery coolant circuit are connected in series; the refrigerant absorbs the heat of the cabin through the evaporator, and then releases the heat through the heater core and the second condenser, which is used for medium-temperature demisting of the cabin.

[0012] Preferably, the control mode also includes a sixth heating mode, in which the multi-way valve module executes the second mode, the first three-way valve and the second three-way valve both execute that their inlet ends are connected to the first outlet end, the second valve, the third valve and the fifth valve are all open, and the first valve, the fourth valve and the sixth valve are all closed. Through the above technical solution, the electric drive coolant circuit and the battery coolant circuit are connected in series, the refrigerant absorbs heat from the electric drive and the battery through the cooler, and releases heat to the coolant through the second condenser. The coolant that absorbs heat heats the radiator to achieve radiator defrosting.

[0013] Preferably, the control mode also includes a seventh heating mode, in which the multi-way valve module executes the second mode, the first three-way valve and the second three-way valve both execute that their inlet ends are connected to the first outlet end, the first valve, the second valve, the third valve and the fifth valve are all open, and the fourth valve and the sixth valve are both closed. Through the above technical solution, the refrigerant is cooled by the first condenser and the second condenser respectively, and the cooled refrigerant flows to the cooler, and the electric drive coolant circuit and the battery coolant circuit are connected in series; the refrigerant absorbs heat from the electric drive and battery circulation through the cooler, and the refrigerant, driven by the compressor, releases heat through the first condenser and the second condenser at the same time, ensuring that the heating needs of the passenger compartment are taken into account when the battery is overcharged.

[0014] Preferably, the control mode also includes an eighth heating mode, in which the multi-way valve module executes the second mode, the first three-way valve and the second three-way valve both execute that their inlet ends are connected to the first outlet end, the first valve, the third valve and the sixth valve are all open, and the second valve, the fourth valve and the fifth valve are all closed. Through the above technical solution, the electric drive coolant circuit and the battery coolant circuit are connected in series, and the electric drive heats the battery; the refrigerant absorbs heat through the second condenser, and the coolant with reduced temperature absorbs ambient heat through the radiator; the refrigerant releases heat to the cabin through the first condenser and the heater core, so that the heat pump takes heat from the environment, the thermistor assists in heating the cabin, and the electric drive heats the battery.

[0015] Preferably, the execution mode of the multi-way valve module also includes a third mode, in which the first valve flap is connected to the third valve flap, the fifth valve flap is connected to the sixth valve flap, and the seventh valve flap is connected to the eighth valve flap; the control mode also includes a ninth heating mode, in which the multi-way valve module executes the third mode, the second three-way valve executes and its inlet end is connected to the second outlet end, the second valve, the third valve and the fourth valve are all open, and the first three-way valve, the first valve, the fifth valve and the sixth valve are all closed. Through the above technical solution, the battery coolant circuit and the electric drive coolant circuit are connected in series and connected to the second condenser; the refrigerant absorbs the cabin heat and releases heat when flowing through the second condenser, so as to realize the recovery of cabin heat to the battery.

[0016] Preferably, the control mode also includes a tenth heating mode, and the tenth heating mode is that the multi-way valve module executes the third mode, the first three-way valve and the second three-way valve both execute that their inlet ends are connected to the first outlet end, the first valve, the third valve and the sixth valve are all open, and the second valve, the fourth valve and the fifth valve are all closed. Through the above technical solution, the electric drive coolant circuit and the battery coolant circuit are connected in series, and the refrigerant flowing through the second condenser is heated to evaporate, and then flows through the radiator for heat dissipation and cooling before flowing back to the battery coolant circuit; the evaporated refrigerant is cooled when flowing through the first condenser under the action of the compressor, so that the coolant flowing therein is heated, and the heated coolant flows through the heater core, and the cooled refrigerant flows back to the second condenser, so that the heat pump takes heat from the electric drive, the battery and the environment to heat the cabin.

[0017] Preferably, the control mode also includes a second cooling mode, in which the multi-way valve module executes the third mode, the second three-way valve executes its inlet end to be connected to the first outlet end, the second valve, the third valve and the fourth valve are all open, and the first three-way valve, the first valve, the fifth valve and the sixth valve are all closed. Through the above technical solution, the battery coolant circuit and the electric drive coolant circuit are connected in series, flowing through the second condenser to absorb the heat released when the refrigerant flowing through it is cooled, dissipating heat and cooling in the radiator before flowing back to the battery coolant circuit; the cooled refrigerant flows to the evaporator, realizing three-system water cooling from battery to electric drive to air conditioning.

[0018] Preferably, the control mode also includes an eleventh heating mode, in which the multi-way valve module executes the first mode, the first three-way valve executes the three-way mode, the second three-way valve executes the inlet end connected to the first outlet end, the first valve, the third valve and the sixth valve are all open, and the second valve, the fourth valve and the fifth valve are all closed. Through the above technical solution, the coolant flows through the electric drive and then flows through the second condenser to exchange heat with the refrigerant, and the heat-absorbed coolant flows through the radiator to absorb environmental heat; the heat-absorbed refrigerant heats the coolant through the first condenser, and the heated coolant flows through the heater core or the heat exchanger, so that the heat pump takes heat from the electric drive and the environment to heat the cabin, and directly heats the battery when the electric drive has a heating function, and indirectly heats the battery through a heat exchanger when the electric drive does not have a heating function.

[0019] Preferably, the control mode also includes a third cooling mode, in which the multi-way valve module executes the first mode, the second three-way valve executes its inlet end to be connected to the first outlet end, the second valve, the third valve and the fifth valve are all open, and the first three-way valve, the first valve, the fourth valve and the sixth valve are all closed. Through the above technical solution, the electric drive coolant circuit and the radiator coolant circuit are connected in series, and absorb the heat released when the refrigerant passing through is cooled when flowing through the second condenser, and dissipate heat and cool in the radiator, and the battery coolant circuit is self-circulating; the cooled refrigerant flows to the evaporator and the cooler respectively, realizing two-system water cooling from the electric drive to the air conditioner, and the air conditioner cools the battery.

[0020] Preferably, the control mode also includes a fourth cooling mode, in which the multi-way valve module executes the first mode, the first three-way valve and the second three-way valve both execute that their inlet ends are connected to the first outlet end, the first valve, the second valve, the third valve and the fifth valve are all open, and the fourth valve and the sixth valve are both closed. Through the above technical solution, the refrigerant is cooled by the first condenser and the second condenser respectively, and the cooled refrigerant flows to the cooler; the electric drive coolant circuit and the radiator coolant circuit are connected in series, and absorb the heat released when the refrigerant flowing through is cooled when flowing through the second condenser, and heat dissipation and cooling are performed in the radiator, and the battery coolant circuit is self-circulating; the coolant heated in the first condenser flows to the heater core for external circulation to assist heat dissipation.

[0021] The present application also provides a control method for a thermal management system for an electric vehicle, which is applied to any of the thermal management systems for an electric vehicle described above, wherein the control modes include first to eleventh heating modes and first to fifth cooling modes, and the control steps are as follows:

[0022] Step 1: When the battery temperature is greater than the forced cooling temperature, the thermal management controller executes the third cooling mode;

[0023] Step 2: When the battery temperature is greater than the natural cooling temperature and less than the forced cooling temperature, the thermal management controller executes the second cooling mode or the fifth cooling mode;

[0024] Step 3: When the battery temperature is greater than the self-circulation temperature and less than the natural cooling temperature, the thermal management controller executes the tenth heating mode;

[0025] Step 4: When the ambient temperature is greater than 0 degrees and less than the self-circulation temperature, the thermal management controller executes the first heating mode or the eleventh heating mode;

[0026] Step 5: When the ambient temperature is less than 0 degrees and greater than the minimum operating temperature of the heat pump, the thermal management controller executes the eighth heating mode;

[0027] Step 6: When the ambient temperature is lower than the minimum operating temperature of the heat pump, the thermal management controller executes the second heating mode;

[0028] Step 7: When the air conditioning controller sends a radiator defrosting signal, the thermal management controller executes the sixth heating mode;

[0029] Step 8: When the air conditioning controller sends a cabin defog signal, the thermal management controller executes the third heating mode, the fourth heating mode, or the fifth heating mode.

[0030] Through the above technical solution, a control method for the above thermal management system is disclosed. According to different application scenarios, the multi-way valve module, the first three-way valve, the second three-way valve and the first to sixth valves are controlled to execute corresponding control modes, so as to achieve the effect of fully utilizing the cooling and heating in the heat pump system, which helps to reduce energy consumption.

[0031] Preferably, the control step further includes step 9: when the electric vehicle is in a stopped state, the thermal management controller executes the first cooling mode or the ninth heating mode or does not act.

[0032] Preferably, the control step further includes step 10: when the battery controller sends a signal indicating that it is in an overcharge state, the thermal management controller executes the seventh heating mode.

[0033] Preferably, the control step further includes step 11: when the thermal management controller triggers an emergency scenario, the thermal management controller executes a fourth cooling mode.

[0034] The thermal management system and control method for electric vehicles of the present invention have the following beneficial effects:

[0035] The thermal management system of the present application connects the inlet and outlet of the electric drive coolant circuit, the inlet and outlet of the battery coolant circuit, and the inlet and outlet of the radiator coolant circuit to the respective interfaces of the multi-way valve module, and designs multiple execution modes of the multi-way valve module to achieve connectivity or non-connectivity among the electric drive coolant circuit, the battery coolant circuit, and the radiator coolant circuit; designs the refrigerant circuit to flow through the first condenser in the cabin coolant circuit, the second condenser in the radiator coolant circuit, and then flows through the evaporator in the air-conditioning box and the cooler in the battery coolant circuit, respectively, to achieve energy conversion between the refrigerant circuit and the coolant circuit; designs multiple control modes of the thermal management controller to achieve multiple circulation modes among the electric drive coolant circuit, the battery coolant circuit, the radiator coolant circuit, the cabin coolant circuit, and the refrigerant circuit, and in the first heating mode In this mode, the heat pump takes heat from the electric drive alone and uses it in the cabin and battery pack, solving the problem that the heat pump must absorb heat from the battery and the electric drive at the same time, causing the battery temperature to be too low; the present application connects a parking heater in series in the cabin coolant circuit, which helps to reduce the amount of electricity used during heating, thereby reducing the attenuation of winter endurance; in the first cooling mode, single-system water cooling of the air conditioner is achieved, which can be used in parking situations, helping to reduce energy consumption; in the third heating mode, the fourth heating mode and the fifth heating mode, slow defogger, fast defogger and medium-temperature defogger of the cabin are respectively achieved, helping to reduce energy consumption; the present application also provides a control method for the above-mentioned thermal management system, which controls the multi-way valve module, the first three-way valve, the second three-way valve and the first to sixth valves to execute corresponding control modes according to different application scenarios, so as to achieve the effect that both the cold and heat in the heat pump system are fully utilized, helping to reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0037] Figure 1 A topological diagram of a thermal management system for an electric vehicle according to an embodiment of the present invention is shown;

[0038] Figure 2 A block diagram of a thermal management system for an electric vehicle according to an embodiment of the present invention is shown;

[0039] Figure 3 A topological diagram of a thermal management system for an electric vehicle according to another embodiment of the present invention is shown.

[0040] Description of reference numerals:

[0041] 1. Multi-way valve module; 21. Front motor; 22. Front electronic control; 23. DC converter; 24. Rear motor; 25. Rear electronic control; 31. First condenser; 32. First water pump; 33. Thermistor; 34. Parking heater; 35. First three-way valve; 36. Warm air core; 41. Battery pack; 42. Cooler; 43. Second water pump; 44. Heat exchanger; 45. Assisted driving system; 51. Second condenser; 52. Second three-way valve; 53. Radiator; 54. Fan; 55. Third water pump; 61. Gas-liquid separator; 62. Compressor; 63. First valve; 64. Second valve; 65. Third valve; 66. Fourth valve; 67. Fifth valve; 68. Sixth valve; 69. Seventh valve; 610. Evaporator; 611. Blower. DETAILED DESCRIPTION

[0042] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0043] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0044] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an embodiment of the present disclosure proposes a thermal management system for an electric vehicle, including a coolant circuit, a refrigerant circuit and a thermal management controller; the coolant circuit includes a multi-way valve module 1, an electric drive coolant circuit, a cabin coolant circuit, a battery coolant circuit, and a radiator 53 coolant circuit; the multi-way valve module 1 includes at least a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface, an eighth interface and corresponding first valve flaps, second valve flaps, third valve flaps, fourth valve flaps, fifth valve flaps, sixth valve flaps, seventh valve flaps and eighth valve flaps, and the second interface and The fifth interface is connected; the inlet and outlet of the electric drive coolant circuit are connected to the first interface and the eighth interface respectively; the cabin coolant circuit includes a first condenser 31; the inlet and outlet of the battery coolant circuit are connected to the sixth interface and the seventh interface respectively. When the electric drive has a heating function, the battery coolant circuit includes a cooler 42; when the electric drive does not have a heating function, the battery coolant circuit also includes a heat exchanger 44, and a first three-way valve 35 is provided on the heat exchanger 44. The inlet and the first outlet of the first three-way valve 35 are connected in series to the cabin coolant circuit, and the second outlet of the first three-way valve 35 is connected to the heat exchanger 44; the inlet and outlet of the radiator 53 coolant circuit The ends are respectively connected to the third interface, the fourth interface and the fifth interface; the radiator 53 coolant circuit includes a second condenser 51, a second three-way valve 52 and a radiator 53 connected in series, the inlet end of the second three-way valve 52 is connected to the second condenser 51, and the first outlet end and the second outlet end of the second three-way valve 52 are respectively connected to the inlet end and the outlet end of the radiator 53; the refrigerant circuit includes a compressor 62, a first module and a second module connected in series; the first module includes a first valve 63, a second valve 64, and a third valve 65, and the pipeline connected in series between the first valve 63 and the first condenser 31 is connected in parallel with the pipeline connected in series between the second valve 64, the second condenser 51 and the third valve 65; the second module includes an evaporator 610, a fourth valve 66, a fifth valve 67, a pipeline in series with the fourth valve 66 and the evaporator 610 is connected in parallel with a pipeline in series with the fifth valve 67 and the cooler 42; a sixth valve 68 is connected in series between the outlet end of the second valve 64 and the inlet end of the compressor 62; the thermal management controller is electrically connected to the multi-way valve module 1, the second three-way valve 52, the first valve 63, the second valve 64, the sixth valve 68, the third valve 65, the fourth valve 66, and the fifth valve 67, and is used to control its execution state according to the control mode; the execution mode of the multi-way valve module 1 includes at least a first mode, in which the first valve flap is connected to the third valve flap, the fifth valve flap is connected to the eighth valve flap, and the seventh valve flap is connected to the sixth valve flap;The control mode of the thermal management controller includes at least a first heating mode, in which the multi-way valve module 1 executes the first mode, the first three-way valve 35 executes the three-way mode, the second three-way valve 52 executes the communication between its inlet and the second outlet, the first valve 63, the third valve 65 and the sixth valve 68 are all opened, and the second valve 64, the fourth valve 66 and the fifth valve 67 are all closed. ;

[0045] In some embodiments, Figures 1 to 3 As shown, the multi-way valve module 1 can be selected as an eight-way valve or two four-way valves. When an eight-way valve is selected, the eight-way valve includes a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface, an eighth interface and a corresponding first valve flap, a second valve flap, a third valve flap, a fourth valve flap, a fifth valve flap, a sixth valve flap, a seventh valve flap and an eighth valve flap; when two four-way valves are selected, one four-way valve includes a first interface, a second interface, a third interface, a fourth interface and a corresponding first valve flap, a second valve flap, a third valve flap and a fourth valve flap, and the other four-way valve includes a fifth interface, a sixth interface, a seventh interface, an eighth interface and a corresponding fifth valve flap, a second valve flap, a third valve flap and a fourth valve flap. Six valve flaps, the seventh valve flap and the eighth valve flap; the second interface is connected to the fifth interface, and the execution mode of the multi-way valve includes at least the first mode, the second mode and the third mode; the first mode is that the first valve flap is connected to the third valve flap, and the fifth valve flap is connected to the eighth valve flap, and the seventh valve flap is connected to the sixth valve flap, and the second valve flap and the fourth valve flap are closed; the second mode is that the second mode is that the first valve flap and the second valve flap are connected, the fourth valve flap and the third valve flap are connected, the seventh valve flap and the eighth valve flap are connected, and the fifth valve flap and the sixth valve flap are connected; the third mode is that the third mode is that the first valve flap is connected to the third valve flap, the fifth valve flap is connected to the sixth valve flap, and the seventh valve flap is connected to the eighth valve flap, and the second valve flap and the fourth valve flap are closed.

[0046] The inlet end of the electric drive coolant circuit is connected to and fixedly connected with the eighth interface, and the outlet end of the electric drive coolant circuit is connected to and fixedly connected with the first interface; the electric drive coolant circuit includes a front motor 21, a front electronic control 22, a DC converter 23, a rear motor 24 and a rear electronic control 25, and a pipeline connected in series with the front motor 21, the front electronic control 22 and the DC converter 23 is connected in parallel with a pipeline connected in series with the rear motor 24 and the rear electronic control 25.

[0047] The cabin coolant circuit includes a heater core 36, a first condenser 31, a first water pump 32 and a heating element connected in series; the heating element is preferably a thermistor 33 or a parking heater 34, specifically, the heating element is the thermistor 33, or the heating element is the parking heater 34, or the heating element is the thermistor 33 and the parking heater 34.

[0048] The inlet end of the battery coolant loop is connected to and fixedly connected with the sixth interface, and the outlet end of the battery coolant loop is connected to and fixedly connected with the seventh interface; when the electric drive has a heating function, such as Figure 3 As shown, the battery coolant circuit includes a battery pack 41, a cooler 42 and a second water pump 43 connected in series. Preferably, an auxiliary driving system 45 is connected in parallel in the battery coolant circuit; when the electric drive does not have a heating function, such as Figure 1 As shown, the battery coolant circuit also includes a heat exchanger 44, which is connected in series in the battery coolant circuit. A first three-way valve 35 is provided on the heat exchanger 44, and the inlet end and the first outlet end of the first three-way valve 35 are connected in series to the cabin coolant circuit. Specifically, the inlet end of the first three-way valve 35 is connected to the heating element, the first outlet end of the first three-way valve 35 is connected to the inlet end of the heater core 36, and the second outlet end of the first three-way valve 35 is connected to the heat exchanger 44, wherein the inlet end, the first outlet end and the second outlet end of the first three-way valve 35 are respectively denoted as A, C, and B.

[0049] The inlet end of the coolant circuit of the radiator 53 is fixedly connected and communicated with the third interface, and the outlet end of the coolant circuit of the radiator 53 is fixedly connected and communicated with both the fourth interface and the fifth interface; the coolant circuit of the radiator 53 includes a second condenser 51, a second three-way valve 52, a radiator 53 and a third water pump 55 connected in series, the inlet end of the second three-way valve 52 is communicated and fixedly connected with the first outlet end of the second condenser 51, the first outlet end and the second outlet end of the second three-way valve 52 are respectively communicated and fixedly connected with the inlet end and the outlet end of the radiator 53, wherein the inlet end, the first outlet end and the second outlet end of the second three-way valve 52 are respectively denoted as A, C, and B; a fan 54 is provided on the radiator 53 opposite to it.

[0050] The refrigerant circuit includes a gas-liquid separator 61, a compressor 62, a first module and a second module connected in series; the first module includes a first valve 63, a second valve 64, a third valve 65 and a seventh valve 69, preferably, the first valve 63 and the second valve 64 are both stop valves, the third valve 65 is an electronic expansion valve, and the seventh valve 69 is a mechanical one-way valve; the pipeline in series of the first valve 63, the first condenser 31 and the seventh valve 69 is connected in parallel with the pipeline in series of the second valve 64, the second condenser 51 and the third valve 65 to form the first module; the second module includes an evaporator 610, a fourth valve 66, and a fifth valve 67, the pipeline in series of the fourth valve 66 and the evaporator 610 is connected in parallel with the pipeline in series of the fifth valve 67 and the cooler 42 to form the second module, the evaporator 610 is arranged opposite to the warm air core 36, and the evaporator 610 is provided with a blower 611 opposite to it; the sixth valve 68 is connected in series between the outlet end of the second valve 64 and the inlet end of the compressor 62.

[0051] Preferably, if Figure 2As shown, the radiator 53 and its fan 54, the heater core 36 and the evaporator 610 and its blower 611, the thermistor 33 or the parking heater 34, the battery pack 41, the electric drive and the compressor 62 are respectively installed at corresponding positions of the electric vehicle, and the multi-way valve module 1, the second three-way valve 52, the first valve 63, the second valve 64, the sixth valve 68, the third valve 65, the fourth valve 66, the fifth valve 67, the seventh valve 69, the first condenser 31, the second condenser 51, the heat exchanger 44 and the connecting pipes therebetween in the coolant circuit and the refrigerant circuit are integrated together to form a thermal management integrated module, which helps to reduce the connecting pipes in the thermal management system of the present application, reduce resistance and optimize costs.

[0052] The thermal management controller is electrically connected to the multi-way valve module 1, the second three-way valve 52, the first valve 63, the second valve 64, the sixth valve 68, the third valve 65, the fourth valve 66, and the fifth valve 67, and is used to control its execution state according to the control mode; the thermal management controller is electrically connected to a water temperature sensor or multiple water temperature sensors in the electric drive coolant circuit, the battery coolant circuit, the radiator 53 coolant circuit, and the cabin coolant circuit, as well as a battery controller, a vehicle controller, an ambient temperature sensor, and an air-conditioning controller respectively; the control mode of the thermal management controller includes at least a first heating mode. Preferably, as shown in Tables 1 and 2, Table 1 represents a switching mode list of the thermal management system of the present application when the electric drive has a heating function, and Table 2 represents a switching mode list of the thermal management system of the present application when the electric drive does not have a heating function. The difference between Tables 1 and 2 is that only the switching relationship of the first three-way valve 35 in each control mode is reduced, and the control mode of the thermal management controller includes first to fifth cooling modes and first to eleventh heating modes.

[0053] The first cooling mode is that the multi-way valve module 1 executes the second mode, the first three-way valve 35 executes the closed mode, the second three-way valve 52 executes the connection between its inlet end and the first outlet end, the second valve 64, the third valve 65 and the fourth valve 66 are all open, and the first valve 63, the fifth valve 67 and the sixth valve 68 are all closed; preferably, the third valve 65 is in the fully open mode, and the fourth valve 66 is in the throttling mode.

[0054] The second cooling mode is that the multi-way valve module 1 executes the third mode, the second three-way valve 52 executes its inlet end to be connected with the first outlet end, the second valve 64, the third valve 65 and the fourth valve 66 are all opened, and the first three-way valve 35, the first valve 63, the fifth valve 67 and the sixth valve 68 are all closed; preferably, the third valve 65 is in the fully open mode, and the fourth valve 66 is in the throttling mode.

[0055] The third cooling mode is that the multi-way valve module 1 executes the first mode, the second three-way valve 52 executes its inlet end to be connected with the first outlet end, the second valve 64, the third valve 65 and the fifth valve 67 are all opened, and the first three-way valve 35, the first valve 63, the fourth valve 66 and the sixth valve 68 are all closed; preferably, the third valve 65 is in the fully open mode, and the fifth valve 67 is in the throttling mode.

[0056] The fourth cooling mode is that the multi-way valve module 1 executes the first mode, the first three-way valve 35 and the second three-way valve 52 both have their inlet ends connected to the first outlet end, the first valve 63, the second valve 64, the third valve 65 and the fifth valve 67 are all open, and the fourth valve 66 and the sixth valve 68 are both closed; preferably, the third valve 65 is in full-open mode, and the fifth valve 67 is in throttling mode.

[0057] Table 1

[0058]

[0059] Table 2

[0060]

[0061] The fifth cooling mode is that the multi-way valve module 1 executes the third mode, the second three-way valve 52 executes its inlet end to be connected with the first outlet end, and the first three-way valve 35, the first valve 63, the second valve 64, the third valve 65, the fourth valve 66, the fifth valve 67 and the sixth valve 68 are all closed. The electric drive coolant circuit and the battery coolant circuit are connected in series, and after passing through the radiator 53 for heat dissipation and cooling, they flow back to the battery coolant circuit in series, realizing water cooling of two systems from the battery to the electric drive.

[0062] The first heating mode is that the multi-way valve module 1 executes the first mode, the first three-way valve 35 executes the three-way mode, the second three-way valve 52 executes the connection between its inlet end and the second outlet end, the first valve 63, the third valve 65 and the sixth valve 68 are all opened, and the second valve 64, the fourth valve 66 and the fifth valve 67 are all closed; preferably, the third valve 65 is in throttling mode.

[0063] The second heating mode is that the multi-way valve module 1 executes the second mode, the first three-way valve 35 executes the three-way mode, the second three-way valve 52 executes its inlet end to be connected with the first outlet end, and the first valve 63, the second valve 64, the third valve 65, the fourth valve 66, the fifth valve 67 and the sixth valve 68 are all closed.

[0064] The third heating mode is that the multi-way valve module 1 executes the second mode, the first three-way valve 35 and the second three-way valve 52 both have their inlet ends connected to the first outlet end, the first valve 63, the third valve 65 and the fourth valve 66 are all opened, and the second valve 64, the fifth valve 67 and the sixth valve 68 are all closed; preferably, the third valve 65 and the fourth valve 66 are both in throttling mode.

[0065] The fourth heating mode is that the multi-way valve module 1 and the second three-way valve 52 both execute any mode, the first three-way valve 35 executes its inlet end to be connected with the first outlet end, the first valve 63 and the fourth valve 66 are both open, and the second valve 64, the third valve 65, the fifth valve 67 and the sixth valve 68 are all closed; preferably, the fourth valve 66 is in throttling mode.

[0066] The fifth heating mode is that the multi-way valve module 1 executes the second mode, the first three-way valve 35 and the second three-way valve 52 both have their inlet ends connected to the first outlet end, the first valve 63, the second valve 64, the third valve 65 and the fourth valve 66 are all open, and the fifth valve 67 and the sixth valve 68 are both closed; preferably, the third valve 65 is in full-open mode, and the fourth valve 66 is in throttling mode.

[0067] The sixth heating mode is that the multi-way valve module 1 executes the second mode, the first three-way valve 35 and the second three-way valve 52 both have their inlet ends connected to the first outlet end, the second valve 64, the third valve 65 and the fifth valve 67 are all open, and the first valve 63, the fourth valve 66 and the sixth valve 68 are all closed; preferably, the third valve 65 is in full-open mode, and the fifth valve 67 is in throttling mode.

[0068] The seventh heating mode is that the multi-way valve module 1 executes the second mode, the first three-way valve 35 and the second three-way valve 52 both have their inlet ends connected to the first outlet end, the first valve 63, the second valve 64, the third valve 65 and the fifth valve 67 are all open, and the fourth valve 66 and the sixth valve 68 are both closed; preferably, the third valve 65 is in full-open mode, and the fifth valve 67 is in throttling mode.

[0069] The eighth heating mode is that the multi-way valve module 1 executes the second mode, the first three-way valve 35 and the second three-way valve 52 both have their inlet ends connected to the first outlet end, the first valve 63, the third valve 65 and the sixth valve 68 are all open, and the second valve 64, the fourth valve 66 and the fifth valve 67 are all closed; preferably, the third valve 65 is in throttling mode.

[0070] The ninth heating mode is that the multi-way valve module 1 executes the third mode, the second three-way valve 52 executes its inlet end to be connected with the second outlet end, the second valve 64, the third valve 65 and the fourth valve 66 are all opened, and the first three-way valve 35, the first valve 63, the fifth valve 67 and the sixth valve 68 are all closed; preferably, the third valve 65 is in the fully open mode, and the fourth valve 66 is in the throttling mode.

[0071] The tenth heating mode is that the multi-way valve module 1 executes the third mode, the first three-way valve 35 and the second three-way valve 52 both have their inlet ends connected to the first outlet end, the first valve 63, the third valve 65 and the sixth valve 68 are all open, and the second valve 64, the fourth valve 66 and the fifth valve 67 are all closed; preferably, the third valve 65 is in throttling mode.

[0072] The eleventh heating mode is that the multi-way valve module 1 executes the first mode, the first three-way valve 35 executes the three-way mode, the second three-way valve 52 executes such that its inlet end is connected to the first outlet end, the first valve 63, the third valve 65 and the sixth valve 68 are all opened, and the second valve 64, the fourth valve 66 and the fifth valve 67 are all closed; preferably, the third valve 65 is in throttling mode.

[0073] The present application also provides a control method for a thermal management system for an electric vehicle, which is applied to any of the thermal management systems for an electric vehicle described above, wherein the control modes include first to eleventh heating modes and first to fifth cooling modes, and the control steps are as follows:

[0074] Step 1: When the battery temperature is greater than the forced cooling temperature, the thermal management controller executes the third cooling mode;

[0075] Step 2: When the battery temperature is greater than the natural cooling temperature and less than the forced cooling temperature, the thermal management controller executes the second cooling mode or the fifth cooling mode;

[0076] Step 3: When the battery temperature is greater than the self-circulation temperature and less than the natural cooling temperature, the thermal management controller executes the tenth heating mode;

[0077] Step 4: When the ambient temperature is greater than 0 degrees and less than the self-circulation temperature, the thermal management controller executes the first heating mode or the eleventh heating mode;

[0078] Step 5: When the ambient temperature is less than 0 degrees and greater than the minimum operating temperature of the heat pump, the thermal management controller executes the eighth heating mode;

[0079] Step 6: When the ambient temperature is lower than the minimum operating temperature of the heat pump, the thermal management controller executes the second heating mode;

[0080] Step 7: When the air conditioning controller sends a defrosting signal for the radiator 53, the thermal management controller executes the sixth heating mode;

[0081] Step 8: When the air conditioning controller sends a cabin defog signal, the thermal management controller executes the third heating mode, the fourth heating mode, or the fifth heating mode.

[0082] Preferably, as shown in Table 1 to Table 2, the control steps are as follows:

[0083] Step 1: When the battery temperature is greater than the forced cooling temperature, the thermal management controller executes the third cooling mode; wherein the forced cooling temperature indicates that when the battery temperature is greater than the temperature, the battery pack 41 needs the forced cooler 42 to cool the battery pack 41;

[0084] Step 2: When the battery temperature is greater than the natural cooling temperature and less than the forced cooling temperature, the thermal management controller executes the second cooling mode or the fifth cooling mode; specifically, when the battery temperature is greater than the natural cooling temperature and less than the forced cooling temperature, and the air conditioning controller issues a cooling request, the thermal management controller executes the second cooling mode; when the battery temperature is greater than the natural cooling temperature and less than the forced cooling temperature, and the air conditioning controller does not issue a request, the thermal management controller executes the fifth cooling mode; wherein the natural cooling temperature means that when it is between this temperature and the forced cooling temperature, the battery pack 41 needs to be cooled, but does not need to be cooled by the cooler 42, and is only cooled by the radiator 53;

[0085] Step 3: When the battery temperature is greater than the self-circulation temperature and less than the natural cooling temperature, and the air conditioning controller issues a heating request, the thermal management controller executes the tenth heating mode; wherein the self-circulation temperature means that when it is between this temperature and the natural cooling temperature, the battery pack 41 does not need to be cooled or heated, and the battery only needs to self-circulate to achieve temperature uniformity, and the refrigerant absorbs heat from the electric drive and the battery through the cooler 42;

[0086] Step 4: When the ambient temperature is greater than 0 degrees and less than the self-circulation temperature, the thermal management controller executes the first heating mode or the eleventh heating mode; specifically, when the ambient temperature is greater than 0 degrees and less than the self-circulation temperature, and the water temperature at the inlet of the radiator 53 is less than the ambient temperature, the thermal management controller executes the eleventh heating mode; when the ambient temperature is greater than 0 degrees and less than the self-circulation temperature, and the water temperature at the inlet of the radiator 53 is greater than the ambient temperature, the thermal management controller executes the first heating mode;

[0087] Step 5: When the ambient temperature is less than 0 degrees and greater than the minimum operating temperature of the heat pump, the thermal management controller executes the eighth heating mode; wherein the minimum operating temperature of the heat pump represents the lowest operating temperature point of the heat pump;

[0088] Step 6: When the ambient temperature is lower than the minimum operating temperature of the heat pump, the thermal management controller executes the second heating mode;

[0089] Step 7: When the air conditioning controller sends a defrosting signal for the radiator 53, the thermal management controller executes the sixth heating mode;

[0090] Step 8: When the air-conditioning controller sends a cabin defog signal, the thermal management controller executes the third heating mode, the fourth heating mode or the fifth heating mode; specifically, when the ambient temperature is between 0 and 10°C and the air-conditioning controller sends a heating request and a cabin defog signal, the thermal management controller executes the third heating mode; when the ambient temperature is between 10 and 20°C and the air-conditioning controller only sends a cabin defog signal, the thermal management controller executes the fourth heating mode; when the ambient temperature is between 20 and 25°C and the air-conditioning controller sends a cooling request and a cabin defog signal, the thermal management controller executes the fifth heating mode.

[0091] Preferably, the controlling step further comprises:

[0092] Step 9: When the electric vehicle is in a stopped state, the thermal management controller executes the first cooling mode or the ninth heating mode or does not act; specifically, when the vehicle controller sends a P gear signal and the air conditioning controller sends a cooling request, the thermal management controller executes the first cooling mode; when the vehicle controller sends a long-term stay signal, the thermal management controller executes the ninth heating mode; wherein the long-term stay signal refers to the operator leaving the vehicle for more than one hour, and a long-term stay signal is formed on the vehicle controller by monitoring the length of time the vehicle is not operated by pressing a button or a timer;

[0093] Step 10: When the battery controller sends a signal that it is in an overcharge state, the thermal management controller executes the seventh heating mode; wherein the signal that it is in an overcharge state means that when the battery pack 41 is in an overcharge state, the battery controller monitors the state of the battery pack 41 and sends a cooling demand signal to the cooler 42;

[0094] Step 11: When the thermal management controller triggers an emergency scenario, the thermal management controller executes the fourth cooling mode; wherein, the thermal management controller includes multiple emergency scenarios, for example, when the battery pack 41 is in fast charging, the battery temperature is greater than the battery limit temperature, the thermal management controller will trigger the emergency scenario.

[0095] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the present invention.

Claims

1. A thermal management system for an electric vehicle, characterized in that: including a coolant circuit, a refrigerant circuit, and a thermal management controller; The coolant circuit comprises a multi-way valve module (1), an electric drive coolant circuit, a cabin coolant circuit, a battery coolant circuit, and a radiator (53) coolant circuit; the multi-way valve module (1) comprises at least a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface, an eighth interface and corresponding first valve flaps, second valve flaps, third valve flaps, fourth valve flaps, fifth valve flaps, sixth valve flaps, seventh valve flaps, and eighth valve flaps; the second interface is connected to the fifth interface; The inlet and outlet of the electric drive coolant circuit are respectively connected to the first interface and the eighth interface; the cabin coolant circuit includes a first condenser (31); the inlet and outlet of the battery coolant circuit are respectively connected to the sixth interface and the seventh interface; when the electric drive has a heating function, the battery coolant circuit includes a cooler (42); when the electric drive does not have a heating function, the battery coolant circuit also includes a heat exchanger (44); a first three-way valve (35) is provided on the heat exchanger (44); the inlet and outlet of the first three-way valve (35) are connected in series to the cabin coolant circuit. In the liquid circuit, the second outlet end of the first three-way valve (35) is connected to the heat exchanger (44); the inlet end and the outlet end of the cooling liquid circuit of the radiator (53) are respectively connected to the third interface, the fourth interface and the fifth interface; the cooling liquid circuit of the radiator (53) comprises a second condenser (51), a second three-way valve (52) and a radiator (53) connected in series, the inlet end of the second three-way valve (52) is connected to the second condenser (51), and the first outlet end and the second outlet end of the second three-way valve (52) are respectively connected to the inlet end and the outlet end of the radiator (53); The refrigerant circuit comprises a compressor (62), a first module and a second module connected in series; the first module comprises a first valve (63), a second valve (64) and a third valve (65); a pipeline connected in series between the first valve (63) and the first condenser (31) is connected in parallel with a pipeline connected in series between the second valve (64), the second condenser (51) and the third valve (65); the second module comprises an evaporator (610), a fourth valve (66) and a fifth valve (67); a pipeline connected in series between the fourth valve (66) and the evaporator (610) is connected in parallel with a pipeline connected in series between the fifth valve (67) and the cooler (42); a sixth valve (68) is connected in series between the outlet end of the second valve (64) and the inlet end of the compressor (62); The thermal management controller is electrically connected to the multi-way valve module (1), the second three-way valve (52), the first valve (63), the second valve (64), the sixth valve (68), the third valve (65), the fourth valve (66) and the fifth valve (67), and is used to control their execution states according to the control mode; the execution mode of the multi-way valve module (1) includes at least a first mode, in which the first valve flap is connected to the third valve flap, the fifth valve flap is connected to the eighth valve flap, and the seventh valve flap is connected to the sixth valve flap; the control mode of the thermal management controller includes at least a first heating mode, in which the multi-way valve module (1) executes the first mode, the first three-way valve (35) executes the three-way mode, the second three-way valve (52) executes the inlet end to be connected to the second outlet end, the first valve (63), the third valve (65) and the sixth valve (68) are all opened, and the second valve (64), the fourth valve (66) and the fifth valve (67) are all closed.

2. The thermal management system for electric vehicles according to claim 1, characterized in that: The cabin coolant circuit also includes a parking heater (34), which is connected in series with a heater core (36).

3. A thermal management system for electric vehicles according to claim 2, characterized in that: The multi-way valve includes a second mode, in which the first valve flap and the second valve flap are connected, the fourth valve flap and the third valve flap are connected, the seventh valve flap and the eighth valve flap are connected, and the fifth valve flap and the sixth valve flap are connected; the control mode also includes a second heating mode, in which the multi-way valve module (1) executes the second mode, the first three-way valve (35) executes the three-way mode, the second three-way valve (52) executes the inlet end thereof being connected to the first outlet end, and the first valve (63), the second valve (64), the third valve (65), the fourth valve (66), the fifth valve (67) and the sixth valve (68) are all closed.

4. A thermal management system for electric vehicles according to claim 3, characterized in that: The control mode also includes a first cooling mode, in which the multi-way valve module (1) executes the second mode, the first three-way valve (35) executes the closed mode, the second three-way valve (52) executes a mode in which its inlet end is connected to the first outlet end, the second valve (64), the third valve (65) and the fourth valve (66) are all opened, and the first valve (63), the fifth valve (67) and the sixth valve (68) are all closed.

5. The thermal management system for electric vehicles according to claim 3, characterized in that: The control mode also includes a third heating mode, in which the multi-way valve module (1) executes the second mode, the first three-way valve (35) and the second three-way valve (52) both execute the communication between their inlet ends and the first outlet end, the first valve (63), the third valve (65) and the fourth valve (66) are all opened, and the second valve (64), the fifth valve (67) and the sixth valve (68) are all closed.

6. The thermal management system for electric vehicles according to claim 3, characterized in that: The control mode also includes a fourth heating mode, in which the multi-way valve module (1) and the second three-way valve (52) both execute any one of the modes, the first three-way valve (35) executes a connection between its inlet end and the first outlet end, the first valve (63) and the fourth valve (66) are both opened, and the second valve (64), the third valve (65), the fifth valve (67) and the sixth valve (68) are all closed.

7. The thermal management system for electric vehicles according to claim 3, characterized in that: The control mode also includes a fifth heating mode, in which the multi-way valve module (1) executes the second mode, the first three-way valve (35) and the second three-way valve (52) both execute the communication between their inlet ends and the first outlet end, the first valve (63), the second valve (64), the third valve (65) and the fourth valve (66) are all opened, and the fifth valve (67) and the sixth valve (68) are both closed.

8. The thermal management system for electric vehicles according to claim 3, characterized in that: The control mode also includes a sixth heating mode, in which the multi-way valve module (1) executes the second mode, the first three-way valve (35) and the second three-way valve (52) both execute their inlet ports to be connected to the first outlet port, the second valve (64), the third valve (65) and the fifth valve (67) are all opened, and the first valve (63), the fourth valve (66) and the sixth valve (68) are all closed.

9. The thermal management system for electric vehicles according to claim 3, characterized in that: The control mode also includes a seventh heating mode, in which the multi-way valve module (1) executes the second mode, the first three-way valve (35) and the second three-way valve (52) are both connected at their inlet ends to the first outlet end, the first valve (63), the second valve (64), the third valve (65) and the fifth valve (67) are all opened, and the fourth valve (66) and the sixth valve (68) are both closed.

10. The thermal management system for electric vehicles according to claim 3, characterized in that: The control mode also includes an eighth heating mode, in which the multi-way valve module (1) executes the second mode, the first three-way valve (35) and the second three-way valve (52) both execute their inlet ends to be connected to the first outlet end, the first valve (63), the third valve (65) and the sixth valve (68) are all opened, and the second valve (64), the fourth valve (66) and the fifth valve (67) are all closed.

11. The thermal management system for electric vehicles according to claim 1, characterized in that: The execution mode of the multi-way valve module (1) also includes a third mode, in which the first valve flap is connected to the third valve flap, the fifth valve flap is connected to the sixth valve flap, and the seventh valve flap is connected to the eighth valve flap; the control mode also includes a ninth heating mode, in which the multi-way valve module (1) executes the third mode, the second three-way valve (52) executes such that its inlet end is connected to the second outlet end, the second valve (64), the third valve (65) and the fourth valve (66) are all opened, and the first three-way valve (35), the first valve (63), the fifth valve (67) and the sixth valve (68) are all closed.

12. A thermal management system for electric vehicles according to claim 11, characterized in that: The control mode also includes a tenth heating mode, in which the multi-way valve module (1) executes the third mode, the first three-way valve (35) and the second three-way valve (52) both execute the communication between their inlet ends and the first outlet end, the first valve (63), the third valve (65) and the sixth valve (68) are all opened, and the second valve (64), the fourth valve (66) and the fifth valve (67) are all closed.

13. The thermal management system for electric vehicles according to claim 11, characterized in that: The control mode also includes a second cooling mode, in which the multi-way valve module (1) executes the third mode, the second three-way valve (52) executes its inlet end to be connected with the first outlet end, the second valve (64), the third valve (65) and the fourth valve (66) are all opened, and the first three-way valve (35), the first valve (63), the fifth valve (67) and the sixth valve (68) are all closed.

14. The thermal management system for electric vehicles according to claim 1, characterized in that: The control mode also includes an eleventh heating mode, in which the multi-way valve module (1) executes the first mode, the first three-way valve (35) executes the three-way mode, the second three-way valve (52) executes such that its inlet end is connected to the first outlet end, the first valve (63), the third valve (65) and the sixth valve (68) are all opened, and the second valve (64), the fourth valve (66) and the fifth valve (67) are all closed.

15. The thermal management system for electric vehicles according to claim 1, characterized in that: The control mode also includes a third cooling mode, in which the multi-way valve module (1) executes the first mode, the second three-way valve (52) executes its inlet end to be connected with the first outlet end, the second valve (64), the third valve (65) and the fifth valve (67) are all opened, and the first three-way valve (35), the first valve (63), the fourth valve (66) and the sixth valve (68) are all closed.

16. The thermal management system for electric vehicles according to claim 1, characterized in that: The control mode also includes a fourth cooling mode, in which the multi-way valve module (1) executes the first mode, the first three-way valve (35) and the second three-way valve (52) both execute the communication between their inlet ends and the first outlet end, the first valve (63), the second valve (64), the third valve (65) and the fifth valve (67) are all opened, and the fourth valve (66) and the sixth valve (68) are both closed.

17. A control method for a thermal management system for an electric vehicle, applied to a thermal management system for an electric vehicle according to any one of claims 1 to 16, characterized in that: The control modes include first to eleventh heating modes and first to fifth cooling modes, and the control steps are as follows: Step 1: When the battery temperature is greater than the forced cooling temperature, the thermal management controller executes the third cooling mode; Step 2: When the battery temperature is greater than the natural cooling temperature and less than the forced cooling temperature, the thermal management controller executes the second cooling mode or the fifth cooling mode; Step 3: When the battery temperature is greater than the self-circulation temperature and less than the natural cooling temperature, the thermal management controller executes the tenth heating mode; Step 4: When the ambient temperature is greater than 0 degrees and less than the self-circulation temperature, the thermal management controller executes the first heating mode or the eleventh heating mode; Step 5: When the ambient temperature is less than 0 degrees and greater than the minimum operating temperature of the heat pump, the thermal management controller executes the eighth heating mode; Step 6: When the ambient temperature is lower than the minimum operating temperature of the heat pump, the thermal management controller executes the second heating mode; Step 7: When the air conditioning controller sends a radiator (53) defrosting signal, the thermal management controller executes the sixth heating mode; Step 8: When the air conditioning controller sends a cabin defog signal, the thermal management controller executes the third heating mode, the fourth heating mode, or the fifth heating mode.

18. The control method of a thermal management system for an electric vehicle according to claim 17, characterized in that: The control step further includes step 9: when the electric vehicle is in a stopped state, the thermal management controller executes the first cooling mode or the ninth heating mode or does not act.

19. The control method of a thermal management system for an electric vehicle according to claim 17, characterized in that: The control step also includes step 10: when the battery controller sends a signal that it is in an overcharge state, the thermal management controller executes the seventh heating mode.

20. The control method of a thermal management system for an electric vehicle according to claim 17, characterized in that: The control step further includes step 11: when the thermal management controller triggers an emergency scenario, the thermal management controller executes a fourth cooling mode.

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