A thermal management system for range-extended new energy vehicles

Abstract

This invention discloses a thermal management system for range-extended electric vehicles, relating to the field of range-extended electric vehicle technology. It includes: a compressor; a plate heat exchanger comprising a first flow channel, a second flow channel, and a third flow channel connected in parallel; a cooling water pump connected in series with the third flow channel; a condenser with its input end connected to the compressor; a low-temperature radiator; a range extender radiator; a heater core; an evaporator core; a water-heating PTC; a first four-way valve, with its first end connected to the output end of the heater core, its second end connected to the water-heating PTC, its third end connected to the low-temperature radiator, and its fourth end connected to the drive motor control unit; and a second four-way valve, with its first end connected to the second flow channel, its second end connected to the cooling water pump, its third end connected to the range extender radiator, and its fourth end connected to the range extender. This system can improve the waste heat utilization rate and cooling efficiency of the heat-generating components of range-extended electric vehicles, while also improving the comfort of the vehicle's passenger compartment.

Description

Technical Field

[0001] This invention relates to the field of range-extended electric vehicle technology, and more specifically, to a thermal management system for range-extended new energy vehicles. Background Technology

[0002] Electrification of automobiles is an important direction, but the capacity and recharging speed of current automotive power batteries are still not comparable to those of ordinary gasoline vehicles. Range-extended electric vehicles can combine the advantages of pure electric vehicles in terms of energy saving and environmental protection with the rapid recharging speed of gasoline vehicles, making them an important technological route in the current new energy vehicle market.

[0003] While range-extended electric vehicles offer the advantages mentioned above, their thermal management systems become more complex. Existing thermal management systems typically employ three independent pathways to address engine cooling, motor cooling, and battery cooling respectively. While this structure is relatively simple and easy to control, it leads to energy waste. Furthermore, the three independent pathways prevent the sharing of components, increasing the overall material cost of the system.

[0004] In summary, how to improve the waste heat utilization rate and cooling efficiency of heat-generating components in range-extended electric vehicles, while simultaneously enhancing the comfort of the passenger compartment and achieving a high-efficiency, low-power thermal management system for electric vehicles, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a thermal management system for range-extended electric vehicles, which can improve the utilization rate of waste heat of the heat-generating parts and the cooling efficiency of the heat-generating components of range-extended electric vehicles, while improving the comfort of the vehicle's passenger compartment, and achieving high efficiency and low power consumption of the thermal management system of electric vehicles.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A thermal management system for range-extended electric vehicles, characterized by comprising:

[0008] compressor;

[0009] A plate heat exchanger includes a first flow channel, a second flow channel, and a third flow channel arranged in parallel. The first flow channel is used for the flow of refrigerant, and the second and third flow channels are both used for the flow of coolant.

[0010] A cooling water pump, connected in series with the third flow channel, is used to supply coolant to the power battery pack;

[0011] A condenser, the input of which is connected to the compressor;

[0012] A low-temperature radiator is used in series with the drive motor control to dissipate heat from the drive motor control.

[0013] A range extender radiator, which is connected in series with the range extender to dissipate heat from the range extender;

[0014] The heater core is used to heat the crew compartment;

[0015] An evaporator core, used to cool the crew compartment;

[0016] A water-heated PTC is used to selectively heat the passenger compartment or the power battery pack.

[0017] The first four-way valve has its first end connected to the output end of the warm air core, its second end connected to the water heating PTC, its third end connected to the low temperature radiator, and its fourth end connected to the drive motor control.

[0018] The second four-way valve has a first end connected to the second flow channel, a second end connected to the cooling water pump, a third end connected to the range extender radiator, and a fourth end connected to the range extender.

[0019] The first flow channel and the input end of the evaporator core are both connected to the output end of the condenser. The output end of the evaporator core is connected to the compressor. The water heating PTC is connected to the input end of the warm air core.

[0020] In one embodiment, a control device is also included. Both the first four-way valve and the second four-way valve include a first state and a second state. In the first state, the first four-way valve is connected to the output end of the heater core and the water heating PTC, and connected to the low-temperature radiator and the drive motor control. The second four-way valve is connected to the second flow channel and the cooling water pump, and connected to the range extender radiator and the range extender.

[0021] In the second state, the first four-way valve connects the output end of the heater core and the low-temperature radiator, connects the water heating PTC and the drive motor control, and the second four-way valve connects the second flow channel and the range extender radiator, connects the cooling water pump and the range extender;

[0022] The low-temperature radiator, the range extender radiator, the heater core, the evaporator core, the water heating PTC, the first four-way valve, and the second four-way valve are all connected to the control device, which is used to control the first four-way valve and the second four-way valve to switch between a first state and a second state.

[0023] In one embodiment, the output end of the condenser is connected to the input end of the liquid receiver, and the input ends of the first flow channel and the evaporator core are both connected to the output end of the liquid receiver;

[0024] A refrigerant shut-off valve and a second expansion valve are sequentially provided between the liquid receiver and the evaporator core.

[0025] In one embodiment, the cooling water pump and the expansion tank are connected.

[0026] In one embodiment, a first temperature sensor is provided between the cooling water pump and the third flow channel, and the first temperature sensor is connected to the control device.

[0027] In one embodiment, a first water pump and a third temperature sensor are connected in series between the low-temperature radiator and the drive motor control;

[0028] A second water pump and a second temperature sensor are connected in series between the range extender radiator and the range extender.

[0029] The first water pump, the third temperature sensor, the second water pump, and the second temperature sensor are all connected to the control device.

[0030] In one embodiment, the output end of the range extender radiator, the third end of the second four-way valve, and the input end of the second water pump are connected by a first three-way valve.

[0031] In one embodiment, the output end of the water heating PTC, the second flow channel, and the input end of the warm air core are connected by a second three-way valve.

[0032] In one embodiment, a detection device for detecting temperature and pressure is provided on the connecting pipeline between the compressor and the plate heat exchanger, and the detection device is connected to the control device. In another embodiment, an intercooler is provided between the low-temperature radiator and the range extender radiator.

[0033] When using the range-extended electric vehicle thermal management system provided by this invention, if simultaneous cooling of the power battery pack and passenger compartment is required, the refrigerant flows out along the pipeline at high temperature and high pressure under the action of the compressor. It then passes through the condenser and exchanges heat with the external environment, becoming a lower-temperature refrigerant. One path of the lower-temperature refrigerant flows to the first flow channel, then through the plate heat exchanger to exchange heat with the coolant flowing through the third flow channel. After being cooled, the coolant flows through the cooling water pump and the third flow channel to the power battery pack, exchanging heat with the high-temperature coolant in the power battery pack and lowering its temperature. The other path of the lower-temperature refrigerant flows to the evaporator core, exchanging heat with the passenger compartment to lower its temperature. Subsequently, the refrigerant returns to the compressor to begin the next cycle.

[0034] At this time, the first four-way valve and the second four-way valve are in the first state, that is, the first four-way valve is connected to the output end of the heater core and the water heating PTC, and also to the low-temperature radiator and the drive motor control unit; the second four-way valve is connected to the second flow channel and the cooling water pump, and also to the range extender radiator and the range extender. Therefore, the range extender is cooled by the range extender radiator, and the drive motor control unit is cooled by the low-temperature radiator. The above-mentioned circulation loops can operate independently.

[0035] If the above-mentioned circulation loop cannot meet the heat dissipation requirements of the range extender and drive motor control, the states of the first four-way valve and the second four-way valve can be switched to the second state, that is, the first four-way valve connects the output end of the heater core and the low-temperature radiator, and connects the water heating PTC and the drive motor control, while the second four-way valve connects the second flow channel and the range extender radiator, and connects the cooling water pump and the range extender.

[0036] Therefore, the cooling water circuits of the range extender radiator and the cryogenic radiator can be connected to the second flow channel of the plate heat exchanger. Heat exchange occurs between the low-temperature refrigerant in the first flow channel and the high-temperature coolant in the second flow channel, thus achieving cooling. The states of the first four-way valve and the second four-way valve can be controlled separately according to the heat dissipation requirements of the range extender radiator and the cryogenic radiator.

[0037] If the passenger compartment requires heating, the first four-way valve and the second four-way valve will be in the second state, utilizing the cooling from the range extender and the waste heat from the drive motor control system to heat the passenger compartment and the battery pack. If the waste heat from the range extender and drive motor control system is insufficient to meet the heating needs of the passenger compartment, an additional water heating PTC can be activated to heat the passenger compartment and the battery pack.

[0038] In summary, the thermal management system for range-extended electric vehicles provided by this invention can improve the utilization rate of waste heat from the heat-generating parts of range-extended electric vehicles and the cooling efficiency of the heat-generating components, while also improving the comfort of the vehicle's passenger compartment, thus achieving a high-efficiency and low-power thermal management system for electric vehicles. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the thermal management system for range-extended new energy vehicles provided by the present invention.

[0041] Figure 2This is a schematic diagram of the first type of operation of the thermal management system for range-extended electric vehicles.

[0042] Figure 3 This is a schematic diagram of the second type of operation of the thermal management system for range-extended electric vehicles.

[0043] Figure 4 This is a schematic diagram of the third type of operation of the thermal management system for range-extended electric vehicles.

[0044] Figure 5 This is a schematic diagram of the fourth type of operation of the thermal management system for range-extended electric vehicles.

[0045] Figures 1-5 middle:

[0046] 1 is the compressor, 2 is the detection device, 3 is the plate heat exchanger, 4 is the first expansion valve, 5 is the expansion tank, 6 is the cooling water pump, 7 is the first temperature sensor, 8 is the power battery pack, 9 is the condenser, 10 is the low-temperature radiator, 11 is the intercooler, 12 is the range extender radiator, 13 is the first three-way valve, 14 is the first water pump, 15 is the second water pump, 16 is the second temperature sensor, 17 is the third temperature sensor, 18 is the refrigerant shut-off valve, 19 is the second expansion valve, 20 is the heater core, 21 is the evaporator core, 22 is the second three-way valve, 23 is the water heating PTC, 24 is the third water pump, 25 is the first four-way valve, 26 is the second four-way valve, 27 is the liquid receiver, 28 is the drive motor control, 29 is the range extender, a is the first flow channel, b is the second flow channel, and c is the third flow channel. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The core of this invention is to provide a thermal management system for range-extended electric vehicles, which can improve the utilization rate of waste heat of the heat-generating parts and the cooling efficiency of the heat-generating components, while improving the comfort of the vehicle's passenger compartment, and achieving high efficiency and low power consumption of the electric vehicle's thermal management system.

[0049] Please refer to Figures 1 to 5 .

[0050] This specific embodiment provides a thermal management system for a range-extended new energy vehicle, including:

[0051] Compressor 1;

[0052] The plate heat exchanger 3 includes a first flow channel a, a second flow channel b and a third flow channel c arranged in parallel. The first flow channel a is used for the flow of refrigerant, and the second flow channel b and the third flow channel c are both used for the flow of coolant.

[0053] Cooling water pump 6, which is connected in series with the third flow channel c, is used to supply coolant to the power battery pack 8;

[0054] Condenser 9, whose inlet is connected to compressor 1;

[0055] Low-temperature radiator 10 is used in series with drive motor control 28 to dissipate heat from drive motor control 28.

[0056] Range extender radiator 12 is connected in series with range extender 29 to dissipate heat from range extender 29;

[0057] The heater core 20 is used to heat the crew compartment;

[0058] Evaporator core 21, which is used to cool the crew compartment;

[0059] The water-heated PTC23 is used for selective heating of the passenger compartment or the power battery pack 8.

[0060] The first four-way valve 25 has its first end connected to the output end of the warm air core 20, its second end connected to the water heating PTC 23, its third end connected to the low temperature radiator 10, and its fourth end connected to the drive motor control 28.

[0061] The second four-way valve 26 has its first end connected to the second flow channel b, its second end connected to the cooling water pump 6, its third end connected to the range extender radiator 12, and its fourth end connected to the range extender 29.

[0062] The input ends of the first flow channel a and the evaporator core 21 are both connected to the output end of the condenser 9. The output end of the evaporator core 21 is connected to the compressor 1. The water heating PTC 23 is connected to the input end of the warm air core 20.

[0063] It also includes a control device. The first four-way valve 25 and the second four-way valve 26 both include a first state and a second state. In the first state, the first four-way valve 25 is connected to the output end of the heater core 20 and the water heater PTC 23, and is connected to the low temperature radiator 10 and the drive motor control 28. The second four-way valve 26 is connected to the second flow channel b and the cooling water pump 6, and is connected to the range extender radiator 12 and the range extender 29.

[0064] In the second state, the first four-way valve 25 connects the output end of the heater core 20 and the low-temperature radiator 10, connects the water heater PTC 23 and the drive motor control 28, and the second four-way valve 26 connects the second flow channel b and the range extender radiator 12, and connects the cooling water pump 6 and the range extender 29.

[0065] The low-temperature radiator 10, range extender radiator 12, heater core 20, evaporator core 21, water heater PTC 23, first four-way valve 25, and second four-way valve 26 are all connected to the control device. The control device is used to control the switching between the first four-way valve 25 and the second four-way valve 26 in a first state and a second state. The control device can control the operation of each component according to the heat dissipation requirements of the range extender 29 and the drive motor control 28, and control the state switching of the first four-way valve 25 and the second four-way valve 26.

[0066] It should be noted that this system ensures that the heat generated by the heat-generating components of the range-extended electric vehicle is fully utilized, reducing energy waste, while improving the cooling effect of the heat-generating components and the comfort of the passenger compartment. This system primarily dissipates heat from the heat-generating components (i.e., the drive motor electronic control unit 28 and the range extender 29, etc.) through the following methods:

[0067] The first method involves heat exchange between the low-temperature refrigerant in the first flow channel a of the plate heat exchanger 3 and the coolant in the second flow channel b and the third flow channel c.

[0068] The second method involves heat exchange between the low-temperature coolant in the third flow channel c of the plate heat exchanger 3 and the coolant in the second flow channel b.

[0069] The third method involves heat exchange between the coolant in the circuit connected to the heat-generating components (i.e., the drive motor control unit 28 and the range extender 29) through the low-temperature radiator 10 and the range extender radiator 12.

[0070] The fourth method involves connecting the heat exchange device (plate heat exchanger 3) of the heating component with the heating core 20 in the passenger compartment to form a circuit. The coolant in the circuit flows through the heating core 20 and the cooling device of the heating component (i.e., the low-temperature radiator 10 and the range extender radiator 12, etc.) to simultaneously increase the temperature in the passenger compartment and decrease the temperature of the heating component.

[0071] It should also be noted that the plate heat exchanger 3 in this system adopts a three-channel heat exchanger, in which the fluids in the three channels can exchange heat with each other. Compared with a two-channel heat exchanger, it is equivalent to reducing two heat exchangers, reducing the number of system components, reducing the complexity of system piping, and also reducing the total system cost.

[0072] In one embodiment, the output end of the condenser 9 is connected to the input end of the liquid receiver 27, and the input ends of the first flow channel a and the evaporator core 21 are both connected to the output end of the liquid receiver 27; a refrigerant shut-off valve 18 and a second expansion valve 19 are sequentially provided between the liquid receiver 27 and the evaporator core 21.

[0073] It should be noted that a first expansion valve 4 may be provided between the first flow channel a and the output end of the reservoir 27. Each valve in this system is used to control the fluid flow rate of the pipeline according to different operating conditions. Both the first expansion valve 4 and the second expansion valve 19 can be electronic expansion valves or thermostatic expansion valves.

[0074] In one embodiment, the cooling water pump 6 and the expansion tank 5 are connected. One function of the expansion tank 5 is to prevent volume changes caused by thermal expansion and contraction of the fluid at different temperatures and to compensate for fluid losses during the flow process. Another function of the expansion tank 5 is to reserve sufficient fluid for each circuit to prevent the generation of air bubbles in the pipes. A third function of the expansion tank 5 is to release air bubbles generated by the fluid during the flow process.

[0075] In one embodiment, a first temperature sensor 7 is provided on the connecting pipe between the cooling water pump 6 and the third flow channel c, and the first temperature sensor 7 is connected to the control device. For example, the first temperature sensor 7 can be set between the cooling water pump 6 and the power battery pack 8, and the power battery pack 8 is connected to the third flow channel c. The first temperature sensor 7 can detect the temperature of the cooling circuit of the power battery pack 8 in real time to provide the control device with the temperature values ​​of each monitoring point, providing a basis for judgment on system operating condition switching and flow control.

[0076] In one embodiment, a first water pump 14 and a third temperature sensor 17 are connected in series between the low-temperature radiator 10 and the drive motor control unit 28; a second water pump 15 and a second temperature sensor 16 are connected in series between the range extender radiator 12 and the range extender 29; the first water pump 14, the third temperature sensor 17, the second water pump 15, and the second temperature sensor 16 are all connected to the control device.

[0077] It should be noted that the third temperature sensor 17 and the second temperature sensor 16 are used to provide the control device with the temperature values ​​of each monitoring point, providing a basis for judgment on system operating condition switching and flow control. The first water pump 14 and the second water pump 15 are used to provide the power for the flow of coolant in the corresponding circulation loop. In addition, an electric fan can be installed close to the side of the range extender radiator 12 to further cool the heat dissipation devices. After the coolant cools the drive motor control unit 28 and the range extender 29, it exchanges heat with the external environment through the range extender radiator 12 and the low-temperature radiator 10, thereby reducing the coolant temperature.

[0078] In one embodiment, the output end of the range extender radiator 12, the third end of the second four-way valve 26, and the input end of the second water pump 15 are connected via a first three-way valve 13. Therefore, by controlling the operation of the first three-way valve 13, the output end of the range extender radiator 12 and the input end of the second water pump 15 can be connected, or the third end of the second four-way valve 26 and the input end of the second water pump 15 can be connected.

[0079] In one embodiment, the output of the water-heating PTC 23, the second flow channel b, and the input of the heater core 20 are connected by a second three-way valve 22. The second three-way valve 22 is used to control the opening and closing of the pipeline and the fluid flow rate according to different operating conditions. That is, by controlling the operation of the second three-way valve 22, the output of the water-heating PTC 23 can be connected to the second flow channel b, or the output of the water-heating PTC 23 can be connected to the input of the heater core 20.

[0080] It should also be noted that both the three-way valve and the four-way valve in this system can be set as electric three-way or electric four-way valves, so that the control device can automatically control and adjust each control valve according to the detection signal, thereby improving the accuracy of operation control and reducing the labor intensity of operators.

[0081] In one embodiment, a detection device 2 for detecting temperature and pressure is provided between the compressor 1 and the plate heat exchanger 3, and the detection device 2 is connected to the control device. That is, the detection device 2 is used to provide the control device with the temperature and pressure values ​​of each monitoring point, providing a basis for judgment on system operating condition switching and flow control. By setting the detection device 2, the pressure and temperature of the liquid flowing out of the plate heat exchanger 3 can be detected in real time, so as to understand the heating and cooling process of the system.

[0082] In one embodiment, an intercooler 11 is provided between the low-temperature radiator 10 and the range extender radiator 12. The intercooler 11 helps to reduce the temperature of the high-temperature air after boosting, thereby reducing the thermal load on the range extender 29 and the drive motor control unit 28. Furthermore, an electric fan can be installed on the side of the range extender radiator 12 away from the intercooler 11 to improve the heat dissipation effect of the range extender radiator 12.

[0083] In one embodiment, a third water pump 24 is provided between the water heating PTC 23 and the second end of the first four-way valve 25, and the third water pump 24 is connected to a control device. That is, the third water pump 24 can drive the liquid in the pipeline to flow into the water heating PTC 23 for heating.

[0084] The thermal management system of this invention includes three-way valves, four-way valves, shut-off valves, detection sensors, and water pumps at multiple locations. The multiple four-way valves, three-way valves, and shut-off valves regulate the opening and closing states of various pipelines, thereby enabling the refrigerant and coolant pipelines to maintain connectivity under different operating conditions. The pumps provide the power for coolant flow in the circulation loop. The valves (i.e., three-way valves, four-way valves, and shut-off valves) control the fluid flow rate according to different operating conditions. The detection sensors provide the control device with temperature and pressure values ​​at each monitoring point, providing a basis for system condition switching and flow control.

[0085] When using this system, the cooling devices (i.e., low-temperature radiator 10 and range extender radiator 12, etc.) of the heat-generating components (i.e., motor control 28 and range extender 29, etc.) can be selectively connected to at least one of the first flow channel a of the plate heat exchanger 3, the range extender radiator 12, and the passenger compartment heating core 20 for heat exchange.

[0086] To further illustrate the usage of the range-extended new energy vehicle thermal management system provided by this invention, an example will be given below.

[0087] When using this system, if both the power battery pack 8 and the passenger compartment need to be cooled simultaneously, the heat-generating components can be cooled using either method 1 or method 3. When using method 1, such as... Figure 2 As shown, the box-shaped arrows indicate the direction of cold air flow, and the thickened arrows indicate the direction of heat flow. Under the action of compressor 1, the refrigerant flows out along the pipeline in a high-temperature, high-pressure state. The high-temperature, high-pressure refrigerant exchanges heat with the environment through condenser 9, changing from a gaseous state to a liquid state. The refrigerant flowing out of condenser 9 flows to the first flow channel a. The liquid refrigerant becomes a low-temperature refrigerant after passing through the first expansion valve 4. Then, the lower-temperature refrigerant flows through plate heat exchanger 3 and exchanges heat with the coolant flowing through the third flow channel c. After being cooled, the coolant flows through cooling water pump 6 and the third flow channel c to the power battery pack 8 to exchange heat with the high-temperature coolant in the power battery pack 8.

[0088] Furthermore, the refrigerant flowing from the condenser 9 flows to the evaporator core 21, where it exchanges heat with the passenger compartment, lowering the compartment temperature. The refrigerant then returns to the compressor 1 to begin the next cycle. This means the low-temperature refrigerant flowing from the evaporator core 21 within the passenger compartment can be used to cool the heat-generating components. This method not only lowers the temperature of both the passenger compartment and the heat-generating components but also recovers and utilizes the remaining cooling capacity of the evaporator core 21 in the passenger compartment, maximizing the utilization of the refrigerant's cooling capacity.

[0089] During this period, heat exchange occurs between the different fluids in the first flow channel a and the third flow channel c within the plate heat exchanger 3, thereby reducing the temperature inside the passenger compartment and cooling the heat-generating components, effectively lowering the temperature of the power battery pack 8 and the passenger compartment.

[0090] At this time, the first four-way valve 25 and the second four-way valve 26 are in the first state, that is, the first four-way valve 25 is connected to the output end of the heater core 20 and the water heater PTC 23, and is also connected to the low-temperature radiator 10 and the drive motor control 28. The second four-way valve 26 is connected to the second flow channel b and the cooling water pump 6, and is also connected to the range extender radiator 12 and the range extender 29. Therefore, the range extender 29 is cooled by the range extender radiator 12, and the drive motor control 28 is cooled by the low-temperature radiator 10. The above-mentioned circulation loops can operate independently.

[0091] If the above-mentioned circulation loop cannot meet the heat dissipation requirements of the range extender 29 and the drive motor control 28, the states of the first four-way valve 25 and the second four-way valve 26 can be switched, allowing the first four-way valve 25 and the second four-way valve 26 to switch to the second state. That is, the first four-way valve 25 connects to the output end of the heater core 20 and the low-temperature radiator 10, and also connects to the water heating PTC 23 and the drive motor control 28; the second four-way valve 26 connects to the second flow channel b and the range extender radiator 12, and also connects to the cooling water pump 6 and the range extender 29. Figure 3 As shown, the box-shaped arrows indicate the direction of cold air flow, and the thick arrows indicate the direction of heat flow.

[0092] Therefore, the cooling water circuits of the range extender radiator 12 and the cryogenic radiator 10 can be connected to the second flow channel b of the plate heat exchanger 3. Heat exchange occurs between the low-temperature refrigerant in the first flow channel a and the high-temperature coolant in the second flow channel b, thereby achieving the purpose of cooling. The states of the first four-way valve 25 and the second four-way valve 26 can be controlled according to the heat dissipation requirements of the range extender radiator 12 and the cryogenic radiator 10, respectively.

[0093] If the crew compartment requires heating, the heat-generating components can be cooled using the fourth method. That is, the first four-way valve 25 and the second four-way valve 26 are in the second state, such as... Figure 4 As shown, the box-shaped arrows indicate the direction of cold air flow, and the thickened arrows indicate the direction of heat flow. This means that the cooling from the range extender 29 and the waste heat from the drive motor control unit 28 can be used to heat the passenger compartment and the battery pack 8.

[0094] If the waste heat from the range extender 29 and the drive motor control unit 28 is insufficient to meet the heating needs of the passenger compartment, the water heater PTC 23 can be activated to heat the passenger compartment and the power battery pack 8. Furthermore, the first four-way valve 25 and the second four-way valve 26 remain in the second state. Figure 5 As shown, the box-shaped arrows indicate the direction of cold air flow, and the thick arrows indicate the direction of heat flow.

[0095] In other words, the range-extended electric vehicle thermal management system provided by this invention can improve the waste heat utilization rate of the heat-generating parts of the range-extended electric vehicle and the cooling efficiency of the heat-generating components, while improving the comfort of the vehicle's passenger compartment and achieving high efficiency and low power consumption of the electric vehicle's thermal management system.

[0096] It should be noted that the first flow channel a, the second flow channel b, the third flow channel c, the first four-way valve 25, the second four-way valve 26, the first end, the second end, the third end, and the fourth end, the first expansion valve 4, the second expansion valve 19, the first temperature sensor 7, the second temperature sensor 16, the third temperature sensor 17, the first water pump 14, the second water pump 15, the third water pump 24, the first three-way valve 13, and the second three-way valve 22 mentioned in this invention are only distinguished by their different positions and do not have any order of precedence.

[0097] In addition, it should be noted that the orientation or positional relationship of the "entry / exit" and other indications in this invention is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the purpose of simplifying the description and making it easier to understand, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0098] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this invention is within the scope of protection of this invention and will not be elaborated upon here.

[0099] The above provides a detailed description of the range-extended new energy vehicle thermal management system provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A thermal management system for a range-extended electric vehicle, characterized in that, include: Compressor (1); The plate heat exchanger (3) includes a first flow channel (a), a second flow channel (b) and a third flow channel (c) distributed in parallel. The first flow channel (a) is used to flow refrigerant, and the second flow channel (b) and the third flow channel (c) are both used to flow coolant. The fluids in the first flow channel (a), the second flow channel (b) and the third flow channel (c) can exchange heat with each other. A cooling water pump (6), which is connected in series with the third flow channel (c), is used to supply coolant to the power battery pack (8); A condenser (9) is connected at its input end to the compressor (1); A low-temperature radiator (10) is used in series with the drive motor control (28) to dissipate heat from the drive motor control (28); Range extender radiator (12), which is connected in series with the range extender (29) to dissipate heat from the range extender (29); The heater core (20) is used to heat the crew compartment; Evaporator core (21) is used to cool the crew compartment; Water-heated PTC (23) is used to selectively heat the passenger compartment or the power battery pack (8); The first four-way valve (25) has its first end connected to the output end of the warm air core (20), its second end connected to the water heating PTC (23), its third end connected to the low temperature radiator (10), and its fourth end connected to the drive motor control (28). The second four-way valve (26) has its first end connected to the second flow channel (b), its second end connected to the cooling water pump (6), its third end connected to the range extender radiator (12), and its fourth end connected to the range extender (29). The first flow channel (a) and the input end of the evaporator core (21) are both connected to the output end of the condenser (9), the output end of the evaporator core (21) is connected to the compressor (1), and the water heating PTC (23) is connected to the input end of the warm air core (20). Both the first four-way valve (25) and the second four-way valve (26) include a first state and a second state. In the first state, the first four-way valve (25) is connected to the output end of the heating core (20) and the water heating PTC (23), and is connected to the low temperature radiator (10) and the drive motor control (28). The second four-way valve (26) is connected to the second flow channel (b) and the cooling water pump (6), and is connected to the range extender radiator (12) and the range extender (29). The range extender (29) is cooled by the range extender radiator (12), and the drive motor control (28) is cooled by the low temperature radiator (10). In the second state, the first four-way valve (25) connects the output end of the heating core (20) and the low-temperature radiator (10), connects the water heating PTC (23) and the drive motor control (28), and the second four-way valve (26) connects the second flow channel (b) and the range extender radiator (12), connects the cooling water pump (6) and the range extender (29). The cooling water circuits of the range extender radiator (12) and the low-temperature radiator (10) are connected to the second flow channel (b) of the plate heat exchanger (3), and heat exchange is performed through the low-temperature refrigerant in the first flow channel (a) and the high-temperature coolant in the second flow channel (b).

2. The thermal management system for range-extended new energy vehicles according to claim 1, characterized in that, It also includes a control device, wherein the low-temperature radiator (10), the range extender radiator (12), the warm air core (20), the evaporator core (21), the water heating PTC (23), the first four-way valve (25) and the second four-way valve (26) are all connected to the control device, and the control device is used to control the first four-way valve (25) and the second four-way valve (26) to switch between a first state and a second state.

3. The thermal management system for range-extended new energy vehicles according to claim 1, characterized in that, The output end of the condenser (9) is connected to the input end of the liquid reservoir (27), and the input ends of the first flow channel (a) and the evaporator core (21) are both connected to the output end of the liquid reservoir (27). A refrigerant shut-off valve (18) and a second expansion valve (19) are sequentially provided between the liquid receiver (27) and the evaporator core (21).

4. The thermal management system for range-extended new energy vehicles according to claim 1, characterized in that, The cooling water pump (6) and the expansion tank (5) are connected.

5. The range-extended electric vehicle thermal management system according to claim 2, characterized in that, A first temperature sensor (7) is provided between the cooling water pump (6) and the third flow channel (c), and the first temperature sensor (7) is connected to the control device.

6. The range-extended electric vehicle thermal management system according to any one of claims 2 to 5, characterized in that, A first water pump (14) and a third temperature sensor (17) are connected in series between the low-temperature radiator (10) and the drive motor control (28). A second water pump (15) and a second temperature sensor (16) are connected in series between the range extender radiator (12) and the range extender (29). The first water pump (14), the third temperature sensor (17), the second water pump (15), and the second temperature sensor (16) are all connected to the control device.

7. The range-extended electric vehicle thermal management system according to claim 6, characterized in that, The output end of the range extender radiator (12), the third end of the second four-way valve (26), and the input end of the second water pump (15) are connected by a first three-way valve (13).

8. The thermal management system for range-extended new energy vehicles according to claim 6, characterized in that, The output end of the water heating PTC (23), the second flow channel (b), and the input end of the warm air core (20) are connected by a second three-way valve (22).

9. The thermal management system for range-extended new energy vehicles according to claim 2, characterized in that, The compressor (1) and the plate heat exchanger (3) are connected by a detection device (2) for detecting temperature and pressure, and the detection device (2) is connected to the control device.

10. The thermal management system for range-extended new energy vehicles according to claim 1, characterized in that, An intercooler (11) is provided between the low-temperature radiator (10) and the range extender radiator (12).

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