Heat pump system, heat management control method and vehicle

Abstract

The invention discloses a heat pump system, a heat management control method and a vehicle, and the heat pump system comprises a battery loop which comprises a battery pack, a first water pump and a cooler, and the cooler comprises a first inlet and a first outlet; the motor loop comprises a power module, an electric drive module, a low-temperature radiator and a second water pump; and the multi-way valve comprises a plurality of ports, and the multi-way valve can switch a first mode, a second mode, a third mode, a fourth mode and a fifth mode. According to the heat pump system, five modes are switched through conduction of different ports of the multi-way valve so as to adjust the connection state between the battery loop and the motor loop, the multi-way valve serves as a heat exchange hub, heat coupling of the multiple loops is achieved while normal heat dissipation of the motor loop and the battery loop is met, and the heat exchange efficiency is improved. And the system heat exchange efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle thermal management, and particularly relates to a heat pump system, a thermal management control method and a vehicle. BACKGROUND

[0002] Pure electric vehicles have become the core technology route of the electric transformation in the transportation field due to their zero carbon emission potential. However, the problem of sharp reduction of endurance caused by performance degradation of power batteries in winter low temperature environment has become a key bottleneck restricting large-scale popularization of pure electric vehicles. Although the heat pump technology widely used in the current industry can improve the low temperature endurance rate to a certain extent, there are still the following technical defects: 1. insufficient thermal coupling degree and low energy utilization rate; 2. low system integration and complex arrangement; 3. strong dependence on PTC and high system cost; 4. heavy battery load and significant endurance loss. SUMMARY

[0003] The purpose of the present application is to provide a heat pump system, a thermal management control method and a vehicle to solve the problems of low integration and insufficient thermal coupling degree of the heat pump system and reduce the battery load in the low temperature environment while ensuring the endurance.

[0004] In a first aspect, the present application provides a heat pump system, comprising: a battery circuit, the battery circuit comprising a battery pack, a first water pump and a cooler, the cooler comprising a first inlet and a first outlet; a motor circuit, the motor circuit comprising a power module, an electric drive module, a low-temperature radiator and a second water pump; a multi-way valve, the multi-way valve comprising a plurality of ports, the conduction of the plurality of ports being adjustable to adjust the communication state of the battery circuit and the motor circuit, the multi-way valve being switchable between a first mode, a second mode, a third mode, a fourth mode and a fifth mode, wherein: when the multi-way valve is switched to the first mode, the battery circuit and the motor circuit are connected in parallel; when the multi-way valve is switched to the second mode, the battery circuit and the motor circuit are connected in series; when the multi-way valve is switched to the third mode, the cooler, the power module and the electric drive module are connected in series; when the multi-way valve is switched to the fourth mode, the battery circuit, the power module and the electric drive module are connected in series; when the multi-way valve is switched to the fifth mode, the battery circuit operates independently, the motor circuit operates independently, and the low-temperature radiator is closed.

[0005] The heat pump system as claimed in the above, preferably, the multi-way valve comprises a first port, a second port, a third port, a fourth port, a fifth port and a sixth port, wherein: the first port is in communication with a first inlet of the cooler, the second port is in communication with an outlet end of the battery pack, the third port is in communication with an outlet end of the low-temperature radiator, the fourth port is in communication with an inlet end of the second water pump, the fifth port is in communication with a first outlet of the cooler, and the sixth port is in communication with an outlet end of the electric drive module; when the multi-way valve is switched to the first mode, the first port is in communication with the second port, and the third port is in communication with the fourth port; when the multi-way valve is switched to the second mode, the first port is in communication with the third port, and the second port is in communication with the fourth port; when the multi-way valve is switched to the third mode, the first port is in communication with the sixth port, and the fourth port is in communication with the fifth port; when the multi-way valve is switched to the fourth mode, the first port is in communication with the sixth port, and the second port is in communication with the fourth port; when the multi-way valve is switched to the fifth mode, the first port is in communication with the second port, and the fourth port is in communication with the sixth port. The heat pump system as claimed in the above, preferably, the heat pump system further comprises an integrated module, the integrated module comprises an integrated seat, a first interface assembly and a second interface assembly, the integrated seat comprises a first integrated side and a second integrated side, the first integrated side is oppositely arranged with the second integrated side, the first interface assembly is arranged on the first integrated side, and the second interface assembly is arranged on the second integrated side; the first water pump, the second water pump and the multi-way valve are arranged on the first integrated side, and the cooler is arranged on the second integrated side; wherein: the first interface assembly comprises a first interface, a second interface, a third interface and a fourth interface, the first interface is in communication with an outlet end of the first water pump, the second interface is in communication with an outlet end of the battery pack, the third interface is in communication with an outlet end of the second water pump, and the fourth interface is in communication with an outlet end of the electric drive module; the second interface assembly comprises a fifth interface, a sixth interface, a seventh interface and an eighth interface, the fifth interface is in communication with a first inlet of the cooler, the sixth interface is in communication with a first outlet of the cooler, the seventh interface is in communication with an inlet end of the low-temperature radiator, and the eighth interface is in communication with an outlet end of the low-temperature radiator.

[0006] The heat pump system as claimed in the preceding description, wherein preferably, the heat pump system further comprises an air conditioning circuit, the air conditioning circuit comprising a compressor, an indoor condenser, an outdoor heat exchanger, an indoor evaporator, a gas-liquid separator and the cooler, the cooler comprising a second inlet and a second outlet, wherein: The gas-liquid separator is arranged on the second integrated side; The first interface assembly further comprises a ninth interface, a tenth interface and an eleventh interface, the ninth interface being in communication with an outlet end of the indoor condenser, the tenth interface being in communication with an inlet end of the indoor evaporator, and the eleventh interface being in communication with an outlet end of the indoor evaporator; The second interface assembly further comprises a twelfth interface, a thirteenth interface, a fourteenth interface, a fifteenth interface and a sixteenth interface, the twelfth interface being in communication with an inlet end of the outdoor heat exchanger, the thirteenth interface being in communication with an outlet end of the outdoor heat exchanger, the fourteenth interface being in communication with an outlet end of the gas-liquid separator, the fifteenth interface being in communication with the second inlet, and the sixteenth interface being in communication with the second outlet.

[0007] The heat pump system as claimed in the preceding description, wherein preferably, the second integrated side is provided with a first electronic expansion valve, a second electronic expansion valve and a third electronic expansion valve, wherein: An inlet end of the first electronic expansion valve is in communication with an outlet end of the indoor condenser, and an outlet end of the first electronic expansion valve is in communication with an inlet end of the outdoor heat exchanger; An inlet end of the second electronic expansion valve is in communication with an outlet end of the outdoor heat exchanger, and an outlet end of the second electronic expansion valve is in communication with an inlet end of the indoor evaporator; An inlet end of the third electronic expansion valve is in communication with an outlet end of the outdoor heat exchanger, and an outlet end of the third electronic expansion valve is in communication with the second inlet of the cooler.

[0008] In a second aspect, the present application provides a thermal management control method applied to the heat pump system as described above, the thermal management control method comprising: When the vehicle enters the direct current fast charging state and the battery temperature is lower than 8℃, the multi-way valve is switched to the fourth mode, the battery circuit is connected in series with the power module and the electric drive module, the active power of the motor is reduced, the reactive power of the motor is increased, and the motor generates heat to heat the coolant of the motor circuit.

[0009] A thermal management control method applied to the heat pump system as described above, the thermal management control method comprising: When the vehicle enters the alternating current slow charging state, the battery temperature is between -10℃ and 8℃, the multi-way valve is switched to the fourth mode, the battery circuit is connected in series with the power module and the electric drive module, and the motor heat generation power is defined according to the charging power provided by the charging pile; When the battery temperature is lower than -10℃, the multi-way valve is switched to the fourth mode, the battery circuit is connected in series with the power module and the electric drive module, the motor active power is controlled to be reduced and the motor reactive power is controlled to be increased, so that the motor generates heat to heat the cooling liquid in the motor circuit.

[0010] The heat management control method described above, preferably, When the charging power of the charging pile is greater than 6kw, the motor is controlled to generate heat to heat the cooling liquid in the motor circuit at the maximum power; When the charging power of the charging pile is greater than 3kw and less than 6kw, the motor is controlled to generate heat to heat the cooling liquid in the motor circuit at the available power less than or equal to the maximum power; When the charging power of the charging pile is less than 3kw, the motor is controlled to generate heat to heat the cooling liquid in the motor circuit at the power less than the available power.

[0011] A heat management control method applied to the heat pump system described above, the heat management control method comprising: When the vehicle is in the driving state, the ambient temperature is lower than 0℃, and the battery SOC is less than 15%, the multi-way valve is switched to the fourth mode, the battery circuit is connected in series with the power module and the electric drive module, and the motor is controlled to generate heat to heat the cooling liquid in the motor circuit at the available power less than or equal to the maximum power.

[0012] In a third aspect, the present application provides a vehicle comprising the heat management control method described above.

[0013] Compared with the prior art, the heat pump system of the present application utilizes the conduction between different ports of the multi-way valve to switch between five modes, so as to adjust the connection state between the battery circuit and the motor circuit. The multi-way valve serves as the hub of heat exchange, realizes the heat coupling of multiple circuits while meeting the normal heat dissipation of the motor circuit and the battery circuit, and improves the heat exchange efficiency of the system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic diagram of the heat pump system provided by the embodiment of the present application; Figure 2 is a structural schematic diagram of the multi-way valve switched to the first mode provided by the embodiment of the present application; Figure 3 is a structural schematic diagram of the multi-way valve switched to the second mode provided by the embodiment of the present application; Figure 4 is a structural schematic diagram of the multi-way valve switching to the third mode provided by the embodiment of the present application; Figure 5 is a structural schematic diagram of the multi-way valve switching to the fourth mode provided by the embodiment of the present application; Figure 6 is a structural schematic diagram of the multi-way valve switching to the fifth mode provided by the embodiment of the present application; Figure 7 is a perspective view of the integrated module from a first perspective provided by the embodiment of the present application; Figure 8 is a perspective view of the integrated module from a second perspective provided by the embodiment of the present application; Figure 9 is a structural schematic diagram of the heat pump system under mode 1 provided by the embodiment of the present application; Figure 10 is a structural schematic diagram of the heat pump system under mode 2 provided by the embodiment of the present application; Figure 11 is a structural schematic diagram of the heat pump system under mode 3 provided by the embodiment of the present application; Figure 12 is a structural schematic diagram of the heat pump system under mode 4 provided by the embodiment of the present application; Figure 13 is a structural schematic diagram of the heat pump system under mode 5 provided by the embodiment of the present application; Figure 14 is a structural schematic diagram of the heat pump system under mode 6 provided by the embodiment of the present application; Figure 15 is a structural schematic diagram of the heat pump system under mode 7 provided by the embodiment of the present application; Figure 16 is a structural schematic diagram of the heat pump system under mode 8 provided by the embodiment of the present application; Figure 17 is a structural schematic diagram of the heat pump system under mode 9 provided by the embodiment of the present application; Figure 18 is a structural schematic diagram of the heat pump system under mode 10 provided by the embodiment of the present application; Figure 19 is a structural schematic diagram of the heat pump system under mode 11 provided by the embodiment of the present application; Figure 20 is a structural schematic diagram of the heat pump system under mode 12 provided by the embodiment of the present application; Figure 21 is a principle diagram of the heat management control method provided by the embodiment of the present application.

[0015] Explanation of reference signs: 100 - battery circuit, 200 - motor circuit, 300 - air conditioning circuit, 400 - integrated module, 410 - integrated seat, 420 - first integrated side, 430 - second integrated side, 440 - first interface assembly, 441 - first interface, 442 - second interface, 443 - third interface, 444 - fourth interface, 445 - ninth interface, 446 - tenth interface, 447 - eleventh interface, 450 - second interface assembly, 451 - fifth interface, 452 - sixth interface, 453 - seventh interface, 454 - eighth interface, 455 - twelfth interface, 456 - thirteenth interface, 457 - fourteenth interface, 458 - fifteenth interface, 459 - sixteenth interface; 1 - battery pack, 2 - first water pump, 3 - cooler, 31 - first inlet, 32 - first outlet, 33 - second inlet, 34 - second outlet, 4 - power module, 5 - electric drive module, 6 - low-temperature radiator, 7 - second water pump, 8 - multi-way valve, 81 - first port, 82 - second port, 83 - third port, 84 - fourth port, 85 - fifth port, 86 - sixth port, 9 - compressor, 10 - indoor condenser, 11 - outdoor heat exchanger, 12 - indoor evaporator, 13 - gas-liquid separator, 14 - first electronic expansion valve, 15 - second electronic expansion valve, 16 - third electronic expansion valve, 17 - heating valve, 18 - dehumidification valve, 19 - one-way valve, 20 - liquid supplement kettle, 21 - wind PTC; M1 - first mode, M2 - second mode, M3 - third mode, M4 - fourth mode, M5 - fifth mode; T1 - first temperature sensor, T2 - second temperature sensor, T3 - third temperature sensor, T4 - fourth temperature sensor, T5 - fifth temperature sensor; PT1 - first pressure temperature sensor, PT2 - second pressure temperature sensor, PT3 - third pressure temperature sensor. DETAILED DESCRIPTION

[0016] The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application only, and cannot be interpreted as a limitation on the present application.

[0017] In a first aspect, with reference to Figure 1 As shown, the present application provides a heat pump system, comprising a battery circuit 100, a motor circuit 200 and a multi-way valve 8, wherein: The battery circuit 100 comprises a battery pack 1, a first water pump 2 and a cooler 3, and the cooler 3 comprises a first inlet 31 and a first outlet 32.

[0018] The motor circuit 200 comprises a power module 4, an electric drive module 5, a low-temperature radiator 6 and a second water pump 7.

[0019] The multi-way valve 8 includes multiple ports, and the opening of the multiple ports can adjust the communication state of the battery circuit 100 and the motor circuit 200. The multi-way valve 8 can switch the first mode M1, the second mode M2, the third mode M3, the fourth mode M4, and the fifth mode M5.

[0020] In the embodiments provided in the present application, referring to Figure 2 When the multi-way valve 8 switches to the first mode M1, the battery circuit 100 and the motor circuit 200 are in parallel, the battery circuit 100 and the motor circuit 200 are cooled respectively, the battery pack 1 is cooled by the cooler 3, and the motor circuit 200 is cooled by the low-temperature radiator 6.

[0021] Referring to Figure 3 When the multi-way valve 8 switches to the second mode M2, the battery circuit 100 and the motor circuit 200 are in series, and the battery circuit 100 and the motor circuit 200 are cooled by the low-temperature radiator 6.

[0022] Referring to Figure 4 When the multi-way valve 8 switches to the third mode M3, the cooler 3 is in series with the power module 4 and the electric drive module 5, the cooler 3 cools the motor circuit 200, and the waste heat of the motor circuit 200 is recycled. The third mode M3 is also a water source heat pump mode.

[0023] Referring to Figure 5 When the multi-way valve 8 switches to the fourth mode M4, the battery circuit 100 is in series with the power module 4 and the electric drive module 5, the cooler 3, the battery pack 1, the power module 4, and the electric drive module 5 are in series, the motor can be heated to reduce the efficiency of the battery, and the waste heat of the motor and the battery pack 1 can be recycled by the cooler 3.

[0024] Referring to Figure 6 When the multi-way valve 8 switches to the fifth mode M5, the battery circuit 100 operates independently, the motor circuit 200 operates independently, the low-temperature radiator 6 is closed, the battery pack 1 is cooled by the cooler 3, and the motor is self-circulated and heat stored.

[0025] In a possible implementation, the multi-way valve 8 includes a first port 81, a second port 82, a third port 83, a fourth port 84, a fifth port 85, and a sixth port 86, wherein: The first port 81 is in communication with the first inlet 31 of the cooler 3, the second port 82 is in communication with the outlet end of the battery pack 1, the third port 83 is in communication with the outlet end of the low-temperature radiator 6, the fourth port 84 is in communication with the inlet end of the second water pump 7, the fifth port 85 is in communication with the first outlet 32 of the cooler 3, and the sixth port 86 is in communication with the outlet end of the electric drive module 5.

[0026] Referring to Figure 2As shown, when the multi-way valve 8 is switched to the first mode M1, the first port 81 and the second port 82 are communicated, the third port 83 and the fourth port 84 are communicated, the first port 81 and the second port 82 are communicated with the first inlet 31 of the cooler 3 and the outlet end of the battery pack 1 respectively, the battery circuit 100 is communicated, the third port 83 and the fourth port 84 are communicated with the outlet end of the low-temperature radiator 6 and the inlet end of the second water pump 7 respectively, the motor water circuit is communicated, and then the battery circuit 100 and the motor circuit 200 are separated and independently operated.

[0027] Referring to Figure 3 As shown, when the multi-way valve 8 is switched to the second mode M2, the first port 81 and the third port 83 are communicated, the second port 82 and the fourth port 84 are communicated, the first port 81 and the third port 83 are communicated with the first inlet 31 of the cooler 3 and the outlet end of the low-temperature radiator 6 respectively, and the cooling liquid flowing out of the low-temperature radiator 6 can flow to the first inlet 31 of the cooler 3 in sequence through the third port 83 and the first port 81; the second port 82 and the fourth port 84 are communicated with the outlet end of the battery pack 1 and the inlet end of the second water pump 7 respectively, and then the cooling liquid flowing out of the battery pack 1 flows to the second water pump 7 in sequence through the second port 82 and the fourth port 84, so as to connect the battery circuit 100 and the motor circuit 200 in series.

[0028] Referring to Figure 4 As shown, when the multi-way valve 8 is switched to the third mode M3, the first port 81 and the sixth port 86 are communicated, the fourth port 84 and the fifth port 85 are communicated, the first port 81 and the sixth port 86 are communicated with the first inlet 31 of the cooler 3 and the outlet end of the electric drive module 5 respectively, the fourth port 84 and the fifth port 85 are communicated with the inlet end of the second water pump 7 and the first outlet 32 of the cooler 3 respectively, and then the cooling liquid flowing out of the power module 4 and the electric drive module 5 flows to the cooler 3 in sequence through the sixth port 86 and the first port 81, and then flows to the second water pump 7 through the fifth port 85 and the fourth port 84 after being cooled by the cooler 3, so as to realize the heat dissipation of the cooler 3 to the motor circuit 200.

[0029] Referring to Figure 5As shown, when the multi-way valve 8 is switched to the fourth mode M4, the first port 81 and the sixth port 86 are in communication, the second port 82 and the fourth port 84 are in communication, the first port 81 and the sixth port 86 are in communication with the first inlet 31 of the cooler 3 and the outlet end of the electric drive module 5 respectively, the second port 82 and the fourth port 84 are in communication with the outlet end of the battery pack 1 and the inlet end of the second water pump 7 respectively, the cooling liquid flowing out of the power module 4 and the electric drive module 5 flows to the cooler 3 through the sixth port 86 and the first port 81 in turn, the cooler 3 absorbs the heat generated by the power module 4 and the electric drive module 5, and then the cooling liquid flows to the battery pack 1, so that the battery pack 1 is warmed up, and finally the cooling liquid flows to the second water pump 7 through the second port 82 and the fourth port 84, thereby realizing the series connection of the cooler 3, the battery pack 1, the power module 4 and the electric drive module 5, and using the motor loop 200 to reduce the efficiency for warming up the battery pack 1.

[0030] Referring to Figure 6 As shown, when the multi-way valve 8 is switched to the fifth mode M5, the first port 81 and the second port 82 are in communication, the fourth port 84 and the sixth port 86 are in communication, the first port 81 and the second port 82 are in communication with the first inlet 31 of the cooler 3 and the outlet end of the battery pack 1 respectively, the fourth port 84 and the sixth port 86 are in communication with the inlet end of the second water pump 7 and the outlet end of the electric drive module 5 respectively, the battery loop 100 operates independently, the cooler 3 cools and dissipates heat for the battery pack 1, and the cooling liquid of the motor loop 200 circulates between the power module 4 and the electric drive module 5, thereby realizing self-circulation heat accumulation.

[0031] Referring to Figure 1 , Figure 7 and Figure 8 As shown, the heat pump system further comprises an integrated module 400, the integrated module 400 comprises an integrated seat 410, a first interface assembly 440 and a second interface assembly 450, the integrated seat 410 comprises a first integrated side 420 and a second integrated side 430, the first integrated side 420 and the second integrated side 430 are oppositely arranged, the first interface assembly 440 is arranged on the first integrated side 420, and the second interface assembly 450 is arranged on the second integrated side 430; the first water pump 2, the second water pump 7 and the multi-way valve 8 are arranged on the first integrated side 420, and the cooler 3 is arranged on the second integrated side 430; the first water pump 2, the second water pump 7 in the battery loop 100 and the motor loop 200 and the multi-way valve 8 switching the communication state between the battery loop 100 and the motor loop 200 are integrated on the integrated seat 410, which can reduce the number of pipelines between the battery loop 100 and the motor loop 200, and can save a large amount of space.

[0032] In the embodiments provided in the present application, the first interface assembly 440 comprises a first interface 441 (A point in Figure 1 the middle), a second interface 442 (C point in Figure 1 the middle), and a third interface 443 (D point inFigure 1 the fourth interface 444 (point G in FIG. 6) of the second interface assembly 450, the fifth interface 451 is in communication with the first inlet 31 of the cooler 3, the sixth interface 452 is in communication with the first outlet 32 of the cooler 3, the seventh interface 453 is in communication with the inlet end of the low-temperature radiator 6, and the eighth interface 454 is in communication with the outlet end of the low-temperature radiator 6. Figure 1

[0033] The second interface assembly 450 includes a fifth interface 451 (point F in FIG. 6), a sixth interface 452 (point H in FIG. 6), a seventh interface 453 (point I in FIG. 6), and an eighth interface 454 (point G in FIG. 6). Figure 1 Figure 1 Figure 1 Figure 1 The fourth interface 444 (point G in FIG. 6) of the second interface assembly 450, the fifth interface 451 is in communication with the first inlet 31 of the cooler 3, the sixth interface 452 is in communication with the first outlet 32 of the cooler 3, the seventh interface 453 is in communication with the inlet end of the low-temperature radiator 6, and the eighth interface 454 is in communication with the outlet end of the low-temperature radiator 6.

[0034] By using the multiple interfaces of the first interface assembly 440 and the second interface assembly 450 to communicate with the components of the battery circuit 100 and the motor circuit 200 respectively, on the one hand, the connection points of the two circuits are locked on both sides of the integrated seat 410, reducing the pipeline required for connecting the battery circuit 100 and the motor circuit 200, and improving the integration of the heat pump system; on the other hand, under the premise of reducing the connecting pipeline, the communication state of the battery circuit 100 and the motor circuit 200 can be quickly switched, and the heat pump system can be switched by using the multi-way valve 8 according to the demand of the heat pump system, so as to shorten the cooling liquid flow time and improve the efficiency of the heat pump system.

[0035] Further, as shown in FIGS. 6, 7, and 8, the heat pump system further includes an air conditioning circuit 300, and the air conditioning circuit 300 includes a compressor 9, an indoor condenser 10, an outdoor heat exchanger 11, an indoor evaporator 12, a gas-liquid separator 13, and the cooler 3. Figure 1 Figure 7 Figure 8 The cooler 3 includes a second inlet 33 and a second outlet 34, and the gas-liquid separator 13 is arranged on the second integrated side 430.

[0036] The first interface assembly 440 further includes a ninth interface 445 (point O in FIG. 6), a tenth interface 446 (point M in FIG. 6), and an eleventh interface 447 (point N in FIG. 6). Figure 1 Figure 1 Figure 1 The ninth interface 445 is in communication with the outlet end of the indoor condenser 10, the tenth interface 446 is in communication with the inlet end of the indoor evaporator 12, and the eleventh interface 447 is in communication with the outlet end of the indoor evaporator 12.

[0037] The second interface assembly 450 further includes a twelfth interface 455 (​​​​​​​​Figure 1 (Middle S point), thirteenth interface 456 ( Figure 1 (Middle R point), fourteenth interface 457 ( Figure 1 (Middle Q point), fifteenth interface 458 ( Figure 1 (Middle L point) and the sixteenth interface 459 ( Figure 1 (Point K), the twelfth interface 455 is connected to the inlet end of the outdoor heat exchanger 11, the thirteenth interface 456 is connected to the outlet end of the outdoor heat exchanger 11, the fourteenth interface 457 is connected to the outlet end of the gas-liquid separator 13, the fifteenth interface 458 is connected to the second inlet of 33, and the sixteenth interface 459 is connected to the second outlet 34.

[0038] Multiple key components of the air conditioning circuit 300 are connected through the ninth interface 445 to the sixteenth interface 459, further improving the integration of the heat pump system. All the inlet and outlet points of the battery circuit 100, motor circuit 200 and air conditioning circuit 300 are concentrated on the integration base 410. While realizing the function of the heat pump system, the number of connecting pipes is greatly reduced, which is conducive to improving the working efficiency of the heat pump system, saving a lot of layout space and reducing production costs.

[0039] To further improve the integration of the heat pump system, the heat pump system of this application integrates functional valves, power components and multiple sensors on the integration base 410, improving the distributed layout into centralized management.

[0040] Specifically, refer to Figure 8 As shown, the second integrated side 430 is provided with a first electronic expansion valve 14, a second electronic expansion valve 15, and a third electronic expansion valve 16, as shown in the figure. Figure 1 As shown, the inlet end of the first electronic expansion valve 14 is connected to the outlet end of the indoor condenser 10, and the outlet end of the first electronic expansion valve 14 is connected to the inlet end of the outdoor heat exchanger 11; the inlet end of the second electronic expansion valve 15 is connected to the outlet end of the outdoor heat exchanger 11, and the outlet end of the second electronic expansion valve 15 is connected to the inlet end of the indoor evaporator 12; the inlet end of the third electronic expansion valve 16 is connected to the outlet end of the outdoor heat exchanger 11, and the outlet end of the third electronic expansion valve 16 is connected to the second inlet 33 of the cooler 3.

[0041] Continue to refer to Figure 8 As shown, the second integrated side 430 is equipped with a heating valve 17, a dehumidifying valve 18, and a one-way valve 19, as shown in the figure. Figure 1As shown, the inlet end of the heating valve 17 is in communication with the outlet end of the outdoor heat exchanger 11, the outlet end of the heating valve 17 is in communication with the inlet end of the gas-liquid separator 13, the inlet end of the dehumidification valve 18 is in communication with the outlet end of the indoor condenser 10, the outlet end of the dehumidification valve 18 is in communication with the second electronic expansion valve 15 and the third electronic expansion valve 16 respectively, the inlet end of the one-way valve 19 is in communication with the outlet end of the outdoor heat exchanger 11, and the outlet end of the one-way valve 19 is in communication with the inlet end of the second electronic expansion valve 15.

[0042] Referring to Figure 7 As shown, the first integrated side 420 is provided with a first temperature sensor T1, a second temperature sensor T2, a third temperature sensor T3, a fourth temperature sensor T4, and a fifth temperature sensor T5, the first temperature sensor T1 is used to detect the temperature of the inlet end of the battery pack 1, the second sensor is used to detect the temperature of the outlet end of the battery pack 1, the third temperature sensor T3 is used to detect the temperature of the outlet end of the second water pump 7, the fourth temperature sensor T4 is used to detect the temperature of the outlet end of the electric drive module 5, and the fifth temperature sensor T5 is used to detect the temperature of the first outlet 32 of the cooler 3.

[0043] Referring to Figure 8 As shown, the second integrated side 430 is provided with a first pressure and temperature sensor PT1, a second pressure and temperature sensor PT2, and a third pressure and temperature sensor PT3, the first pressure and temperature sensor PT1 is used to detect the pressure and temperature of the inlet end of the compressor 9, the second pressure and temperature sensor PT2 is used to detect the pressure and temperature of the outlet end of the indoor condenser 10, and the third pressure and temperature sensor PT3 is used to detect the pressure and temperature of the outlet end of the outdoor heat exchanger 11.

[0044] Referring to Figure 7 As shown, the first integrated side 420 is also integrated with a liquid supplementing kettle 20, the liquid supplementing kettle 20 is arranged on the integrated seat 410, and the liquid supplementing kettle 20 is in communication with the cooling liquid circuit, thereby shortening the connecting pipeline between the liquid supplementing kettle 20 and the heat pump system, enabling the liquid supplementing kettle 20 to quickly supplement cooling liquid for the system and maintain the pressure stability of the system.

[0045] Referring to Figure 1As shown in the figure, the shaded part of the figure represents the integrated area of the first interface assembly 440, the second interface assembly 450, the multi-way valve 8, the gas-liquid separator 13, various functional valves, power components and sensors. As can be seen from the figure, the heat pump system of the present application integrates all the various functional valves, power components and sensors originally dispersed in the chassis on the integrated seat 410, and only a small amount of pipelines is needed to connect the components of the complex heat pump system, which facilitates centralized management of these components, greatly reduces the brackets, wiring harnesses, connectors and other components required for installing these components, reduces costs, saves installation space and improves assembly efficiency. Since the air conditioning circuit 300 includes the cooler 3, the cooler 3 can realize heat exchange between the air conditioning circuit 300 and the battery circuit 100 and the motor circuit 200, and through the switching of the multi-way valve 8, the heat pump system can realize the switching of the following multiple modes.

[0046] 1. Battery & passenger cabin dual refrigeration mode: Referring to Figure 9 As shown in the figure, at this time, the air conditioning circuit 300 (refrigerant circuit) and the battery circuit 100 (cooling liquid circuit) are both in operation. The indoor evaporator 12 and the cooler 3 are connected in parallel, and the passenger cabin and the battery can be cooled according to demand, or can be cooled simultaneously. The motor circuit 200 and the battery circuit 100 operate independently, the motor is cooled by the low-temperature radiator 6, and the battery pack 1 is cooled by the cooling liquid.

[0047] Working process: The compressor 9 compresses the refrigerant working medium, converts the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state, and discharges from the exhaust port of the compressor 9. After throttling by the first electronic expansion valve 14, it is cooled and condensed in the outdoor heat exchanger 11. The refrigerant changes from gas to liquid. At this time, the one-way valve 19 is opened, the heating valve 17 is closed, and the refrigerant is divided into two paths and throttled by the second electronic expansion valve 15 and the third electronic expansion valve 16 to reduce temperature and pressure. The refrigerant becomes wet steam, passes through the indoor evaporator 12 to absorb the heat of the cab air side, and then flows through the gas-liquid separator 13. The other way of refrigerant passes through the cooler 3 to absorb the heat of the battery circuit 100 cooling liquid, and then flows into the gas-liquid separator 13 for gas-liquid separation to prevent liquid refrigerant from entering the compressor 9 and causing liquid damage to the compressor 9. Finally, it returns to the compressor 9 to complete a cycle.

[0048] At this time, the multi-way valve 8 switches the first mode M1, the first port 81 and the second port 82 are connected, the third port 83 and the fourth port 84 are connected, the battery circuit 100 is self-circulated, the first temperature sensor T1 monitors the water temperature at the inlet end of the battery pack 1 in the circuit, controls the rotating speed and duty cycle of the first water pump 2, and ensures that the battery works in the appropriate temperature range (35-45℃), at this time, the motor circuit 200 uses the low-temperature radiator 6 for heat dissipation, the third temperature sensor T3 monitors the water temperature at the inlet end of the power module 4, and controls the rotating speed and duty cycle of the second water pump 7 to ensure that the water temperature is in the appropriate temperature range of the motor circuit 200.

[0049] 2. Battery LTR cooling mode: Referring to Figure 10 Fig. 6, the battery and the low-temperature radiator 6 are connected together, and the battery is cooled through the low-temperature radiator 6.

[0050] Working process: the components of the air conditioning circuit 300 are in a stopped running state, the multi-way valve 8 switches the second mode M2, the first port 81 and the third port 83 are connected, the second port 82 and the fourth port 84 are connected, the battery circuit 100 and the motor circuit 200 are connected in series, the first temperature sensor T1 and the third temperature sensor T3 monitor the water temperature at the inlet end of the battery pack 1 and the inlet end of the power module 4 respectively, and control the rotating speed of the first water pump 2 and the second water pump 7 to ensure that the water temperature is in the appropriate temperature range of the battery circuit 100 and the motor circuit 200.

[0051] 3. Passenger compartment refrigeration + battery LTR cooling mode: Referring to Figure 11 Fig. 7, the outdoor heat exchanger 11 is used as a condenser, and the motor circuit 200 and the battery circuit 100 are connected in series.

[0052] Working process: the air conditioning circuit 300 is in a running state, the compressor 9 compresses the refrigerant working medium, converts the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state, and discharges from the exhaust port of the compressor 9, passes through the first electronic expansion valve 14 for throttling, and is cooled and condensed in the outdoor heat exchanger 11. The refrigerant is converted from a gaseous state to a liquid state, at this time, the one-way valve 19 is opened, the heating valve 17 is closed, the third electronic expansion valve 16 is closed, the refrigerant passes through the second electronic expansion valve 15 for throttling, and the refrigerant becomes wet steam, which absorbs heat from the air side of the cab through the indoor evaporator 12.

[0053] The battery circuit 100 and the motor circuit 200 are in a running state, the multi-way valve 8 switches the second mode M2, the first port 81 and the third port 83 are in conduction, the second port 82 and the fourth port 84 are in conduction, the battery circuit 100 and the motor circuit 200 are in series, the first temperature sensor T1 and the third temperature sensor T3 monitor the water temperature at the inlet end of the battery pack 1 and the inlet end of the power module 4 respectively, and the rotation speed of the first water pump 2 and the second water pump 7 is controlled to ensure that the water temperature is in the appropriate temperature range of the battery circuit 100 and the motor circuit 200.

[0054] 4. Passenger cabin refrigeration and dehumidification + battery LTR heat dissipation mode: Referring to Figure 12 Fig. 11, the outdoor heat exchanger 11 is used as a condenser, the indoor condenser 10 and the outdoor condenser are in series, and the motor circuit 200 and the battery circuit 100 are in series.

[0055] Working process: The compressor 9 compresses the refrigerant working medium, converts the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state, discharges from the exhaust port of the compressor 9, and cools and condenses the passenger cabin in the indoor condenser 10. After throttling by the first electronic expansion valve 14, the refrigerant is cooled and condensed in the outdoor heat exchanger 11, and the refrigerant is converted from a gaseous state to a liquid state. At this time, the one-way valve 19 is opened, the heating valve 17 is closed, the refrigerant passes through the second electronic expansion valve 15 to reduce the temperature and pressure, the refrigerant becomes wet steam, and the passenger cabin refrigeration and dehumidification effect is achieved by absorbing the heat of the passenger cabin through the evaporator.

[0056] The battery circuit 100 and the motor circuit 200 are in a running state, the multi-way valve 8 switches the second mode M2, the first port 81 and the third port 83 are in conduction, the second port 82 and the fourth port 84 are in conduction, the battery circuit 100 and the motor circuit 200 are in series, the first temperature sensor T1 and the third temperature sensor T3 monitor the water temperature at the inlet end of the battery pack 1 and the inlet end of the power module 4 respectively, and the rotation speed of the first water pump 2 and the second water pump 7 is controlled to ensure that the water temperature is in the appropriate temperature range of the battery circuit 100 and the motor circuit 200.

[0057] 5. Passenger cabin heating and dehumidification mode: Referring to Figure 13 Fig. 12, the outdoor heat exchanger 11 is used as an evaporator, the outdoor heat exchanger 11 and the indoor evaporator 12 are in parallel, the motor circuit 200 and the battery circuit 100 are in series, and the motor waste heat can heat the battery (5-15℃). It is suitable for the case where the battery temperature is lower than 5℃.

[0058] Working process: The compressor 9 compresses the refrigerant working medium, converts the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state, and is discharged from the exhaust port of the compressor 9. The heat is released to heat the passenger cabin through the indoor condenser 10. After the heat is released to heat the passenger cabin through the indoor condenser 10, it flows in two ways. One way passes through the first electronic expansion valve 14 to throttle, and is cooled and condensed in the outdoor heat exchanger 11. The refrigerant is converted from a gaseous state to a liquid state. At this time, the one-way valve 19 is closed, and the heating valve 17 is opened. The refrigerant directly returns to the gas-liquid separator 13. The other way passes through the dehumidification valve 18, throttles and reduces the temperature and pressure through the second electronic expansion valve 15, and the refrigerant becomes wet steam. The heat of the passenger cabin is absorbed through the evaporator to achieve the heating and dehumidification effect of the passenger cabin.

[0059] The battery circuit 100 and the motor circuit 200 are in an operating state. The multi-way valve 8 switches to the second mode M2. The first port 81 and the third port 83 are conductive. The second port 82 and the fourth port 84 are conductive. The battery circuit 100 and the motor circuit 200 are connected in series. The first temperature sensor T1 and the third temperature sensor T3 respectively monitor the water temperature at the inlet end of the battery pack 1 and the inlet end of the power module 4. The rotation speed of the first water pump 2 and the second water pump 7 is controlled to ensure that the water temperature is within the appropriate temperature range of the battery circuit 100 and the motor circuit 200.

[0060] 6. Heating and dehumidification mode of the passenger cabin: Referring to Figure 14 As shown, the cooler 3 is used as an evaporator. The cooler 3 and the indoor evaporator 12 are connected in parallel as double evaporators. The first electronic expansion valve 14 is closed. The motor circuit 200 and the battery circuit 100 are connected in series (bypassing the battery). This is suitable for the motor heat surplus working condition.

[0061] Working process: The compressor 9 compresses the refrigerant working medium, converts the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state, and is discharged from the exhaust port of the compressor 9. The heat is released to heat the passenger cabin through the indoor condenser 10. After the heat is released to heat the passenger cabin through the indoor condenser 10, it flows in two ways. One way passes through the first electronic expansion valve 14 to throttle, and is cooled and condensed in the outdoor heat exchanger 11. The refrigerant is converted from a gaseous state to a liquid state. At this time, the one-way valve 19 is closed, and the heating valve 17 is opened. The refrigerant directly returns to the gas-liquid separator 13. The other way passes through the dehumidification valve 18, throttles and reduces the temperature and pressure through the second electronic expansion valve 15, and the refrigerant becomes wet steam. The heat of the passenger cabin is absorbed through the indoor evaporator 12 to achieve the dehumidification effect. Another way passes through the third electronic expansion valve 16 to throttle and reduce the temperature and pressure. The refrigerant absorbs the heat of the battery circuit 100 through the cooler 3, and then flows into the gas-liquid separator 13 for gas-liquid separation to prevent liquid refrigerant from entering the compressor 9 and causing liquid damage to the compressor 9. Finally, it returns to the compressor 9 to complete a cycle.

[0062] The motor loop 200 is in operation, the multi-way valve 8 switches the third mode M3, the first port 81 and the sixth port 86 are connected, the fourth port 84 and the fifth port 85 are connected, the cooler 3, the power module 4 and the electric drive module 5 are connected in series, the third temperature sensor T3 monitors the water temperature at the inlet of the power module 4, and the rotation speed of the second water pump 7 is controlled to ensure that the water temperature is within the appropriate temperature range of the motor loop 200.

[0063] 7. Passenger cabin heating mode: Referring to Figure 15 Fig. 7, the air conditioning loop 300 further includes a wind PTC 21, which can be started to assist heating when the passenger cabin heating is insufficient. The ambient heat is absorbed by the outdoor heat exchanger 11, the motor waste heat is recovered, and the wind PTC 21 supplements the heat when the waste heat is insufficient. The priority principle is motor waste heat > air heat > wind PTC 21.

[0064] When the motor waste heat is sufficient, the ambient heat absorption can be turned off; when the ambient heat absorption can meet the demand of the passenger cabin, the motor waste heat can be used for battery heating. It is applicable to fast charging heating, slow charging heating, pre-order heating, intelligent heating and electric drive heat storage scenarios.

[0065] Working process: The compressor 9 compresses the refrigerant working medium, converts the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state, and discharges from the exhaust port of the compressor 9. After releasing heat to heat the passenger cabin through the indoor condenser 10, it is divided into two paths. One path passes through the first electronic expansion valve 14 to throttle, and is cooled and condensed in the outdoor heat exchanger 11. The refrigerant changes from gas to liquid, at which time the one-way valve 19 is closed and the heating valve 17 is opened. The refrigerant directly returns to the gas-liquid separator 13. The other path passes through the dehumidification valve 18, flows through the third electronic expansion valve 16 to throttle, and the refrigerant becomes wet steam. After absorbing the heat of the cooling liquid through the Chiller, it is combined into the gas-liquid separator 13 for gas-liquid separation and returns to the compressor 9.

[0066] The motor loop 200 is in operation, the multi-way valve 8 switches the third mode M3, the first port 81 and the sixth port 86 are connected, the fourth port 84 and the fifth port 85 are connected, and only the cooling liquid of the motor loop 200 passes through the cooler 3 to exchange heat to the refrigerant.

[0067] 8. Battery heating (motor active heating) mode: Referring to Figure 16 Fig. 8, the motor is used to heat the battery.

[0068] Working process: Each part of the refrigerant circuit is in a stop running state, the multi-way valve 8 switches the fourth mode M4, the first port 81 is in conduction with the sixth port 86, the second port 82 is in conduction with the fourth port 84, the battery circuit 100 and the motor circuit 200 are connected in series, the motor reduces the heating cooling liquid, then the cooling liquid heats the battery pack 1 through the motor, the first temperature sensor T1 and the third temperature sensor T3 monitor the water temperature at the inlet end of the battery pack 1 and the inlet end of the power module 4, and control the rotating speed of the first water pump 2 and the second water pump 7 to ensure that the water temperature is in the appropriate temperature range of the battery circuit 100 and the motor circuit 200.

[0069] 9. Occupant cabin heating (OHX) & battery heating mode: Referring to Figure 17 Fig. 8, the ambient heat is absorbed through the outdoor heat exchanger 11; the air source heat absorption is insufficient, and the air PTC 21 assists in heating; the motor heats the battery.

[0070] Working process: The compressor 9 compresses the refrigerant working medium, converts the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state, and discharges from the exhaust port of the compressor 9, releases heat to heat the occupant cabin through the indoor condenser 10, flows through the indoor condenser 10 to release heat and heat the occupant cabin, is throttled, depressurized and cooled by the first electronic expansion valve 14, and is cooled and condensed in the outdoor heat exchanger 11. At this time, the one-way valve 19 is closed, the heating valve 17 is opened, and the refrigerant directly returns to the gas-liquid separator 13.

[0071] The battery circuit 100 and the motor circuit 200 are in a running state, the multi-way valve 8 switches the fourth mode M4, the first port 81 is in conduction with the sixth port 86, the second port 82 is in conduction with the fourth port 84, the battery circuit 100 and the motor circuit 200 are connected in series, the motor reduces the heating cooling liquid, then the battery is heated through the motor, the first temperature sensor T1 and the third temperature sensor T3 monitor the water temperature at the inlet end of the battery pack 1 and the inlet end of the drive module, and control the rotating speed of the first water pump 2 and the second water pump 7 to ensure that the water temperature is in the appropriate temperature range of the battery circuit 100 and the motor circuit 200.

[0072] 10. Battery & electric drive heat storage mode: Referring to Figure 18 Fig. 9, the battery stores heat, and the motor is rapidly heated.

[0073] Working process: Each component of the air conditioning circuit 300 is in a stop running state, the multi-way valve 8 switches the fifth mode M5, the first port 81 and the second port 82 are conductive, the fourth port 84 and the sixth port 86 are conductive, the battery circuit 100 and the motor circuit 200 are independently running, the battery stores heat by itself, and the motor heats up quickly. The first temperature sensor T1 and the third temperature sensor T3 monitor the water temperature at the inlet end of the battery pack 1 and the inlet end of the drive module, and control the rotating speed of the first water pump 2 and the second water pump 7 to ensure that the water temperature is in the appropriate temperature range of the battery circuit 100 and the motor circuit 200.

[0074] 11. Defrosting mode: Referring to Figure 19 the working process: The compressor 9 compresses the refrigerant working medium, converts the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state, and discharges it from the exhaust port of the compressor 9. The first electronic expansion valve 14 throttles and reduces the pressure and temperature, and the outdoor heat exchanger 11 dissipates heat and condenses. The heating valve 17 is closed, the refrigerant passes through the third electronic expansion valve 16 to throttle and reduce the temperature and pressure, flows through the cooler 3 to absorb the heat of the motor circuit 200, and returns to the gas-liquid separator 13 for gas-liquid separation. Finally, it returns to the compressor 9 to complete a cycle.

[0075] The motor circuit 200 is in a running state, the multi-way valve 8 switches the third mode M3, the first port 81 and the sixth port 86 are conductive, the fourth port 84 and the fifth port 85 are conductive, and only the motor circuit 200 cooling liquid passes through the cooler 3 to exchange heat to the refrigerant.

[0076] 12. Passenger cabin single PTC heating mode Referring to Figure 20 the mode is suitable for the working condition without air source and motor waste heat.

[0077] Working process: The wind PTC 21 heats the passenger cabin, the multi-way valve 8 only switches the fourth port 84 and the sixth port 86 to be conductive, and the motor circuit 200 is self-circulating and heat storage.

[0078] In the second aspect, referring to Figure 21 the present application provides a thermal management control method, comprising the foregoing heat pump system, the thermal management control method is suitable for the multi-way valve 8 switching to the fourth mode M4, and the thermal management control method comprises: When the vehicle enters the DC fast charging state, the battery temperature is lower than 8℃, the battery needs to be quickly heated, the system is in the pure battery heating state, the required heating water temperature is 65-70℃, the multi-way valve 8 is switched to the fourth mode M4, the battery circuit 100 is connected in series with the power module 4 and the electric drive module 5, the motor is controlled to reduce the active power and increase the reactive power (wherein the maximum value of the reactive power is 3kw), so that the motor generates heat to heat the coolant of the motor circuit 200, and the heated coolant of the motor after the motor is reduced in efficiency enters the battery circuit 100, so as to realize the rapid heating of the battery.

[0079] When the vehicle enters the AC slow charging state, the battery temperature is between -10℃ and 8℃, the multi-way valve 8 is switched to the fourth mode M4, the battery circuit 100 is connected in series with the power module 4 and the electric drive module 5, and the motor heating power is defined according to the charging power provided by the charging pile.

[0080] Specifically, when the charging power of the charging pile is greater than 6kw, the motor is controlled to generate heat to heat the coolant of the motor circuit 200 at the maximum power, the maximum power of the motor is 3kw, the battery requires the heating water temperature to be 35-40℃ or 65-70℃, and the motor is heated at the power of 3kw. The coolant of the motor circuit 200 after being heated enters the battery circuit 100 to heat the battery.

[0081] When the charging power of the charging pile is greater than 3kw and less than 6kw, the motor is controlled to generate heat to heat the coolant of the motor circuit 200 at the available power less than or equal to the maximum power, and the maximum power of the motor is 3kw.

[0082] When the battery requires the heating water temperature to be 35-40℃, the motor is heated at the maximum power of 3kw, and the coolant of the motor circuit 200 after being heated enters the battery circuit 100 to heat the battery.

[0083] When the battery requires the heating water temperature to be 65-70℃, the motor is heated at the available power less than 3kw, and the coolant of the motor circuit 200 after being heated enters the battery circuit 100 to heat the battery.

[0084] When the charging power of the charging pile is less than 3kw, the motor is controlled to generate heat to heat the coolant of the motor circuit 200 at the power less than the available power, the battery requires the heating water temperature to be 35-40℃ or 65-70℃, and the motor is heated at the power less than 3kw. The coolant of the motor circuit 200 after being heated enters the battery circuit 100 to heat the battery.

[0085] When the battery temperature is lower than -10 DEG C, the battery needs heating water temperature is 65 DEG C-70 DEG C, the multi-way valve 8 is switched to the fourth mode M4, the battery circuit 200 is connected with the power module 4 and the electric drive module 5 in series, the motor is controlled to reduce active power and increase reactive power, so that the motor generates heat to heat the cooling liquid of the motor circuit 200, and the cooling liquid after heating by the motor is entered into the battery circuit 100, so that the battery is rapidly heated.

[0086] When the vehicle is in the driving state, the ambient temperature is lower than 0 DEG C, and the battery SOC (battery power percentage) is less than 15%, the battery needs heating, the battery needs heating water temperature is 35-40 DEG C, the multi-way valve 8 is switched to the fourth mode M4, the battery circuit 100 is connected with the power module 4 and the electric drive module 5 in series, the motor is controlled to generate heat to heat the cooling liquid of the motor circuit 200 with available power less than or equal to the maximum power, the maximum power of the motor is 3kw, the motor generates heat with power less than or equal to 3kw, and the generated heat is directly entered into the battery circuit 100 to heat the battery.

[0087] The heat management control method of the present application uses the motor stall and drop-out heating technology to heat the battery, and realizes the on-demand connection of the water circuit by combining the precise temperature control and the multiple mode adjustment of the multi-way valve 8, so that the motor drop-out heating technology is used to heat the battery in the low-temperature environment, the water PTC is cancelled, the traditional battery film heating technology and the water PTC heating technology are replaced, the hardware cost is reduced, the electric-thermal conversion path is shortened, the vehicle power consumption is reduced under the same heating target, the system energy utilization efficiency is improved, and the system cost is reduced.

[0088] In the third aspect, the present application provides a vehicle comprising the heat management control method described above. The heat management control method uses the motor stall and drop-out technology to heat the battery, so that the vehicle power consumption is reduced, the system energy utilization rate is improved, and the performance of the vehicle is improved by using the heat management control method described above.

[0089] The heat pump system uses the multi-way valve 8 to adjust the heat management mode of the motor, battery and passenger compartment three-loop systems, and the multi-way valve 8 is used as the hub of heat exchange. While meeting the normal heat dissipation of the motor and battery, the heat coupling of the battery circuit 100, the motor circuit 200 and the air conditioning circuit 300 can be realized, so that the heat coupling of the three loops is realized, the system heat exchange efficiency is improved, and the winter endurance performance of the vehicle is improved.

[0090] The above describes the structure, features and effects of the present application in detail according to the embodiments shown in the drawings. The above description is only the preferred embodiments of the present application, but the present application is not limited to the embodiments shown in the drawings. Any changes or modifications made according to the concept of the present application, or equivalent embodiments with equivalent changes, are still within the scope of protection of the present application, as long as they do not exceed the spirit of the description and drawings.

Claims

1. A heat pump system, characterized by, The heat pump system comprises: a battery circuit comprising a battery pack, a first water pump, and a cooler comprising a first inlet and a first outlet; a motor circuit comprising a power module, an electric drive module, a low-temperature radiator, and a second water pump; a multi-way valve comprising a plurality of ports, the conduction of the plurality of ports being capable of adjusting the communication state of the battery circuit and the motor circuit, the multi-way valve being capable of switching between a first mode, a second mode, a third mode, a fourth mode, and a fifth mode, wherein: when the multi-way valve is switched to the first mode, the battery circuit and the motor circuit are connected in parallel; when the multi-way valve is switched to the second mode, the battery circuit and the motor circuit are connected in series; when the multi-way valve is switched to the third mode, the cooler, the power module, and the electric drive module are connected in series; when the multi-way valve is switched to the fourth mode, the battery circuit, the power module, and the electric drive module are connected in series; when the multi-way valve is switched to the fifth mode, the battery circuit operates independently, the motor circuit operates independently, and the low-temperature radiator is closed.

2. The heat pump system of claim 1, wherein, The multi-way valve comprises a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port, wherein: the first port is in communication with the first inlet of the cooler, the second port is in communication with the outlet end of the battery pack, the third port is in communication with the outlet end of the low-temperature radiator, the fourth port is in communication with the inlet end of the second water pump, the fifth port is in communication with the first outlet of the cooler, and the sixth port is in communication with the outlet end of the electric drive module; when the multi-way valve is switched to the first mode, the first port and the second port are in conduction, and the third port and the fourth port are in conduction; when the multi-way valve is switched to the second mode, the first port and the third port are in conduction, and the second port and the fourth port are in conduction; when the multi-way valve is switched to the third mode, the first port and the sixth port are in conduction, and the fourth port and the fifth port are in conduction; when the multi-way valve is switched to the fourth mode, the first port and the sixth port are in conduction, and the second port and the fourth port are in conduction; when the multi-way valve is switched to the fifth mode, the first port and the second port are in conduction, and the fourth port and the sixth port are in conduction.

3. The heat pump system of claim 1, wherein, The heat pump system further comprises an integrated module comprising an integrated seat, a first interface assembly, and a second interface assembly, the integrated seat comprising a first integrated side and a second integrated side, the first integrated side being oppositely arranged with the second integrated side, the first interface assembly being arranged on the first integrated side, and the second interface assembly being arranged on the second integrated side; the first water pump, the second water pump, and the multi-way valve are arranged on the first integrated side, and the cooler is arranged on the second integrated side; wherein: The first interface assembly includes a first interface, a second interface, a third interface, and a fourth interface, the first interface is in communication with the outlet end of the first water pump, the second interface is in communication with the outlet end of the battery pack, the third interface is in communication with the outlet end of the second water pump, and the fourth interface is in communication with the outlet end of the electric drive module; The second interface assembly includes a fifth interface, a sixth interface, a seventh interface, and an eighth interface, the fifth interface is in communication with the first inlet of the cooler, the sixth interface is in communication with the first outlet of the cooler, the seventh interface is in communication with the inlet end of the low-temperature radiator, and the eighth interface is in communication with the outlet end of the low-temperature radiator.

4. The heat pump system of claim 3, wherein, The heat pump system further includes an air conditioning circuit, the air conditioning circuit includes a compressor, an indoor condenser, an outdoor heat exchanger, an indoor evaporator, a gas-liquid separator, and the cooler, the cooler includes a second inlet and a second outlet, wherein: The gas-liquid separator is arranged on the second integrated side; The first interface assembly further includes a ninth interface, a tenth interface, and an eleventh interface, the ninth interface is in communication with the outlet end of the indoor condenser, the tenth interface is in communication with the inlet end of the indoor evaporator, and the eleventh interface is in communication with the outlet end of the indoor evaporator; The second interface assembly further includes a twelfth interface, a thirteenth interface, a fourteenth interface, a fifteenth interface, and a sixteenth interface, the twelfth interface is in communication with the inlet end of the outdoor heat exchanger, the thirteenth interface is in communication with the outlet end of the outdoor heat exchanger, the fourteenth interface is in communication with the outlet end of the gas-liquid separator, the fifteenth interface is in communication with the second inlet, and the sixteenth interface is in communication with the second outlet.

5. The heat pump system of claim 4, wherein, The second integrated side is provided with a first electronic expansion valve, a second electronic expansion valve, and a third electronic expansion valve, wherein: The inlet end of the first electronic expansion valve is in communication with the outlet end of the indoor condenser, and the outlet end of the first electronic expansion valve is in communication with the inlet end of the outdoor heat exchanger; The inlet end of the second electronic expansion valve is in communication with the outlet end of the outdoor heat exchanger, and the outlet end of the second electronic expansion valve is in communication with the inlet end of the indoor evaporator; The inlet end of the third electronic expansion valve is in communication with the outlet end of the outdoor heat exchanger, and the outlet end of the third electronic expansion valve is in communication with the second inlet of the cooler.

6. A thermal management control method, characterized by, The heat management control method is applied to the heat pump system of any one of claims 1 to 5, and the heat management control method includes: When the vehicle enters a direct current fast charging state and the battery temperature is lower than 8℃, the multi-way valve is switched to the fourth mode, the battery circuit is connected in series with the power module and the electric drive module, the active power of the motor is reduced, the reactive power of the motor is increased, and the motor generates heat to heat the coolant of the motor circuit.

7. A thermal management control method, characterized by, The heat management control method is applied to the heat pump system of any one of claims 1 to 5, and the heat management control method includes: When the vehicle enters the AC slow charging state, the battery temperature is between -10℃-8℃, the multi-way valve is switched to the fourth mode, the battery loop is connected in series with the power module and the electric drive module, and the motor heat generation power is defined according to the charging power provided by the charging pile; When the battery temperature is lower than -10℃, the multi-way valve is switched to the fourth mode, the battery loop is connected in series with the power module and the electric drive module, the motor active power is controlled to be reduced and the motor reactive power is controlled to be increased, so that the motor generates heat to heat the cooling liquid in the motor loop.

8. The thermal management control method according to claim 7, wherein: When the charging power of the charging pile is greater than 6kw, the motor is controlled to generate heat to heat the cooling liquid in the motor loop at the maximum power; When the charging power of the charging pile is greater than 3kw and less than 6kw, the motor is controlled to generate heat to heat the cooling liquid in the motor loop at the available power less than or equal to the maximum power; When the charging power of the charging pile is less than 3kw, the motor is controlled to generate heat to heat the cooling liquid in the motor loop at the power less than the available power.

9. A thermal management control method, characterized by, The thermal management control method is applied to the heat pump system according to any one of claims 1 to 5, and comprises: When the vehicle is in the driving state, the ambient temperature is lower than 0℃, and the battery SOC is less than 15%, the multi-way valve is switched to the fourth mode, the battery loop is connected in series with the power module and the electric drive module, and the motor is controlled to generate heat to heat the cooling liquid in the motor loop at the available power less than or equal to the maximum power.

10. A vehicle characterized by comprising: The thermal management control method comprises any one of claims 6 to 9. The thermal management control method comprises any one of claims 6 to 9.

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