A heat pump system for a new energy power system

Abstract

This utility model relates to the field of heat pump technology, specifically to a heat pump system for a new energy power system. The system includes an electronic water pump assembly, a refrigeration unit assembly, an electronic expansion valve assembly, a three-way proportional valve assembly, a five-way proportional valve assembly, a cold air core, a warm air core, a radiator, a fan, a compressor, a blower, a water-cooled condenser, a gas-liquid separator, and an expansion tank assembly. Sensors monitor the temperature and operating conditions of the passenger compartment, battery pack, motor, and electronic control system. Based on this, the control system determines and selects an appropriate mode, activating corresponding actuators. The proportional valves and electronic expansion valves precisely regulate the flow rate and direction of the coolant and refrigerant. The system continuously monitors and returns to standby mode when preset exit conditions are met. It uses R290 refrigerant to meet low GWP requirements and reduce emissions; the proportional valves and heat exchange devices adapt to different operating conditions; and the dual-indirect heat exchange reduces safety hazards.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, and in particular to a heat pump system for a new energy power system. Background Technology

[0002] Currently, most domestic pure electric mobile mechanical air conditioning systems use R134a refrigerant, but its high GWP value (1430) can easily damage the ozone layer and exacerbate the greenhouse effect.

[0003] From July 1, 2029, refrigerants with a GWP exceeding 150 will be prohibited from use in the air conditioning systems of new M1 category vehicles. R290 refrigerant is environmentally friendly and can replace R134a, with a low GWP and excellent low-temperature performance, but it is flammable and requires dual-channel indirect heat exchange for safety. While R290-based heat pump systems offer advantages in environmental protection and thermal management, they face challenges related to safety and compatibility. Utility Model Content

[0004] The purpose of this utility model is to provide a heat pump system for a new energy power system, which aims to solve the problem of poor safety performance of existing heat pump systems.

[0005] To achieve the above objectives, in a first aspect, this utility model provides a heat pump system for a new energy power system, including an electronic water pump group, a refrigeration unit group, an electronic expansion valve group, a three-way proportional valve group, a five-way proportional valve group, a cold air core, a warm air core, a radiator, a fan, a compressor, a blower, a water-cooled condenser, a gas-liquid separator, and an expansion tank group.

[0006] The electronic water pump unit circulates coolant in the passenger compartment, battery pack, and motor control system, adjusting the coolant flow direction and velocity to meet heat exchange requirements. The refrigeration unit unit facilitates heat exchange between the refrigerant and coolant. The electronic expansion valve unit throttles and reduces pressure, adjusts the refrigerant saturation temperature to achieve phase change heat transfer, regulates refrigerant flow, and controls cooling output. The three-way and five-way proportional valve units provide precise proportional control of coolant flow. The cooling core absorbs heat from the coolant to cool the passenger compartment, while the heating core releases heat from the coolant to heat the passenger compartment. The radiator dissipates the heat absorbed by the coolant into the environment, and the fan-assisted radiator removes heat by driving airflow. The compressor transports the refrigerant. The blower accelerates heat exchange between the indoor heat exchanger and the air. The water-cooled condenser dissipates refrigerant heat in summer and absorbs heat in winter. The gas-liquid separator separates liquid and gas from the refrigerant. The expansion tank unit provides liquid to the coolant circuit and discharges gas.

[0007] The electronic water pump group includes electronic water pump one, electronic water pump two, and electronic water pump three. Electronic water pump one, electronic water pump two, and electronic water pump three are respectively used to realize the circulation of coolant in the motor control, passenger compartment, and battery pack circuit.

[0008] The refrigeration unit group includes refrigeration unit one and refrigeration unit two. Refrigeration unit one is responsible for refrigerating the passenger compartment, while refrigeration unit two provides refrigeration for the battery pack and recovers waste heat from the motor and electronic control system.

[0009] The electronic expansion valve assembly includes electronic expansion valve one and electronic expansion valve two, which are used to control the refrigerant flow and adjust the cooling capacity of each part.

[0010] The three-way proportional valve assembly includes a three-way proportional valve one, a three-way proportional valve two, and a three-way proportional valve three. All three valves are used to achieve proportional control of the coolant flow in different directions.

[0011] The five-way proportional valve group includes a five-way proportional valve one and a five-way proportional valve two, both of which are used to achieve proportional control of coolant flow in different directions.

[0012] The expansion tank assembly includes expansion tank one and expansion tank two, which are used to provide sufficient liquid to the coolant circuit and to remove gas from the circuit.

[0013] Secondly, a control method for a heat pump system of a new energy power system, used in the heat pump system of the new energy power system described in the first aspect, includes the following steps:

[0014] Real-time monitoring of temperature and operating conditions of the passenger compartment, battery pack, motor, and electronic control system;

[0015] Based on the monitoring results, activate the corresponding working mode;

[0016] Adjust the operation of the compressor, refrigeration unit, W-PTC, electric water pump unit, fan and proportional valve.

[0017] This utility model discloses a heat pump system for a new energy power system. Upon system startup, sensors monitor the temperature and operating conditions of the passenger compartment, battery pack, motor, and electronic control system. Based on the monitoring data, the control system determines and selects a suitable operating mode. In the selected mode, corresponding actuators are activated, precisely regulating the flow rate and direction of coolant and refrigerant via proportional valves and electronic expansion valves. The system continuously monitors temperature changes; when a preset exit condition is reached, the corresponding mode ends, and the system returns to standby mode, awaiting the next control command. Using R290 refrigerant meets regulatory requirements for low GWP refrigerants, reducing greenhouse gas emissions and protecting the ozone layer. Through precise control of the proportional valve and the synergistic effect of multiple heat exchange devices, it can flexibly adapt to different operating conditions, meeting the thermal management needs of the passenger compartment, battery pack, and motor / electronic control system. The use of dual indirect heat exchange reduces the safety hazards posed by the flammability of R290 refrigerant. By recovering and utilizing waste heat through the heat pump system, the energy consumption of additional heating is reduced, improving the overall vehicle energy efficiency. This solves the problem of poor safety performance in existing heat pump systems. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This utility model provides a heat pump system for a new energy power system.

[0020] Figure 2 This is a schematic diagram of a self-looping mode.

[0021] Figure 3 This is a schematic diagram of the motor's electronic control cooling mode.

[0022] Figure 4 This is a schematic diagram of the battery cooling mode operation.

[0023] Figure 5 This is a schematic diagram of the crew cabin cooling mode operation.

[0024] Figure 6 This is a schematic diagram of the battery cooling mode operation.

[0025] Figure 7 This is a schematic diagram of the cab and battery operating in a simultaneous cooling mode.

[0026] Figure 8 This is a schematic diagram of the crew cabin heating mode operation.

[0027] Figure 9 This is a schematic diagram of the crew cabin heating mode operation.

[0028] Figure 10 This is a schematic diagram of the crew cabin heating mode operation.

[0029] Figure 11 This is a schematic diagram of the battery heating mode operation.

[0030] Figure 12 This is a schematic diagram of the battery heating mode operation.

[0031] Figure 13 This is a schematic diagram of the crew cabin heating and battery cooling modes.

[0032] Figure 14 This is a schematic diagram illustrating the operation of the battery heating and motor cooling modes.

[0033] Figure 15 This is a flowchart of a control method for a heat pump system in a new energy power system provided by this utility model.

[0034] In the diagram: 1-Cold air core, 2-Heat air core, 3-Radiator, 4-Fan, 5-Compressor, 6-Blower, 7-Water-cooled condenser, 8-Gas-liquid separator, 9-Electronic water pump I, 10-Electronic water pump II, 11-Electronic water pump III, 12-Refrigeration unit I, 13-Refrigeration unit II, 14-Electronic expansion valve I, 15-Electronic expansion valve II, 16-Three-way proportional valve I, 17-Three-way proportional valve II, 18-Three-way proportional valve III, 19-Five-way proportional valve I, 20-Five-way proportional valve II, 21-Expansion tank I, 22-Expansion tank II. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0036] Please see Figures 1 to 14 In the first aspect, this utility model provides a heat pump system for a new energy power system, including an electronic water pump group, a refrigeration unit group, an electronic expansion valve group, a three-way proportional valve group, a five-way proportional valve group, a cold air core 1, a warm air core 2, a radiator 3, a fan 4, a compressor 5, a blower 6, a water-cooled condenser 7, a gas-liquid separator 8, and an expansion tank group.

[0037] The electronic water pump unit circulates coolant in the passenger compartment, battery pack, and motor control system, and adjusts the coolant flow direction and velocity to meet heat exchange requirements. The refrigeration unit unit enables heat exchange between the refrigerant and coolant. The electronic expansion valve unit is used for throttling and pressure reduction, adjusting the refrigerant saturation temperature to achieve phase change heat transfer, regulating refrigerant flow, and controlling cooling output. The three-way proportional valve unit and five-way proportional valve unit are used for precise proportional control of coolant flow direction. The cooling core 1 cools the passenger compartment by absorbing heat from the coolant, while the heating core 2 heats the passenger compartment by releasing heat from the coolant. The radiator 3 dissipates the heat absorbed by the coolant into the environment, and the fan 4 assists the radiator 3 in driving airflow to remove heat. The compressor 5 transports the refrigerant. The blower 6 accelerates heat exchange between the indoor heat exchanger and the air. The water-cooled condenser 7 dissipates heat from the refrigerant and absorbs heat. The gas-liquid separator 8 separates liquid and gas in the refrigerant. The expansion tank unit provides liquid to the coolant circuit and discharges gas.

[0038] Furthermore, the electronic water pump assembly includes electronic water pump 9, electronic water pump 10, and electronic water pump 11. Electronic water pump 9, electronic water pump 10, and electronic water pump 11 are respectively used to realize the circulation of coolant in the motor control, passenger compartment, and battery pack circuits.

[0039] Furthermore, the refrigeration unit group includes a first refrigeration unit 12 and a second refrigeration unit 13. The first refrigeration unit 12 is responsible for refrigerating the passenger compartment, and the second refrigeration unit 13 provides refrigeration for the battery pack and recovers waste heat from the motor and electronic control system.

[0040] Furthermore, the electronic expansion valve assembly includes electronic expansion valve one 14 and electronic expansion valve two 15, which are used to control the refrigerant flow and adjust the cooling capacity of each part.

[0041] Furthermore, the three-way proportional valve assembly includes a first three-way proportional valve 16, a second three-way proportional valve 17, and a third three-way proportional valve 18. The first three-way proportional valve 16, the second three-way proportional valve 17, and the third three-way proportional valve 18 are all used to achieve proportional control of the coolant flow in different directions.

[0042] Furthermore, the five-way proportional valve assembly includes a five-way proportional valve 19 and a five-way proportional valve 20, both of which are used to achieve proportional control of coolant flow in different directions.

[0043] Furthermore, the expansion tank assembly includes an expansion tank 21 and an expansion tank 22, which are used to provide sufficient liquid to the coolant circuit while venting gas from the circuit.

[0044] In this embodiment, the mobile machinery heat pump system of this utility model is applicable to the thermal management of various mobile machinery, including construction machinery and agricultural machinery. Upon system startup, sensors monitor the temperature and operating conditions of the passenger compartment, battery pack, motor, and electronic control system. Based on the monitoring data, the control system determines and selects a suitable operating mode. In the selected mode, the corresponding actuators are activated, precisely adjusting the flow rate and direction of coolant and refrigerant through proportional valves and electronic expansion valves. The system continuously monitors temperature changes; when a preset exit condition is reached, the corresponding mode ends, and the system returns to standby mode, awaiting the next control command. Using R290 refrigerant meets regulatory requirements for low GWP refrigerants, reducing greenhouse gas emissions and protecting the ozone layer. Through precise control of the proportional valve and the synergistic effect of multiple heat exchange devices, it can flexibly adapt to different operating conditions, meeting the thermal management needs of the passenger compartment, battery pack, and motor / electronic control system. The use of dual indirect heat exchange reduces the safety hazards posed by the flammability of R290 refrigerant. By recovering and utilizing waste heat through the heat pump system, the energy consumption of additional heating is reduced, improving the overall vehicle energy efficiency. This solves the problem of poor safety performance in existing heat pump systems.

[0045] (a) Heat dissipation mode

[0046] 1.1 Self-loop

[0047] Applicable operating conditions: When there is no need for air conditioning, motor, or electronic control, the vehicle is idling and the high voltage is applied, and the battery temperature difference is too large, the electric water pump is turned on to accelerate the circulation of coolant and reduce the temperature difference between the battery cells.

[0048] Activation conditions: The battery temperature difference is large, but the battery temperature is within a comfortable range, and there is no need for cooling or heating.

[0049] Action performed: Electronic water pump 311 operates, pins 1 and 4 of five-way proportional valve 20 are connected, and pins A and D of five-way proportional valve 19 are connected.

[0050] Exit condition: The difference between the battery's maximum temperature and minimum temperature is relatively small, such as a temperature difference of less than 5°C.

[0051] 1.2 Motor and electronic control heat dissipation

[0052] Applicable operating conditions: When the motor and electronic control unit are overheating and there is no need for waste heat recovery, the heat is dissipated through coolant circulation and a fan, preventing the motor from overheating and affecting its lifespan.

[0053] Activation condition: The motor temperature or electronic control temperature exceeds the specifications, requiring the cooling system to be activated.

[0054] Actions executed: Electronic water pump 9 starts working, ports B and C of five-way proportional valve 19 are connected, the fan starts, and ports 1 and 2 of three-way proportional valve 18 are connected.

[0055] Exit condition: Both motor temperature and electronic control temperature are below the target requirements, and no heat dissipation is needed. 2.2 Battery heat dissipation

[0056] Applicable operating conditions: During winter charging, there is no need for motor and electronic control. The battery temperature is slightly high, but the heat can be dissipated through the combined action of coolant and fan, without the need for compressor 5 to cool it down.

[0057] Activation conditions: The battery temperature is high and needs to be dissipated (e.g., <45℃), but it is not yet at the limit power output, and the motor inlet water temperature and ambient temperature are low, with a temperature difference of at least 10℃ from the battery temperature.

[0058] Actions executed: Electronic water pump 19 and electronic water pump 311 operate; ports A and B of 5-way proportional valve 19 are connected; ports C and D are connected; ports 1 and 4 of 5-way proportional valve 20 are connected; fan starts; ports 1 and 2 of 3-way proportional valve 318 are connected.

[0059] Exit conditions: If the battery temperature is too high (e.g., ≥45℃), the charging power should be limited; if the battery temperature is too low, the heat dissipation mode should be exited; or if the temperature difference between the battery and the environment is insufficient, the heat exchange efficiency is low.

[0060] (ii) Cooling mode

[0061] 2.1 Crew cabin cooling

[0062] Applicable operating conditions: When the air conditioner is on and the battery has no cooling or heating requirements.

[0063] Activation conditions: The air conditioner cooling switch is turned on and the knob is turned to cooling.

[0064] Actions performed: Compressor 5 operates, fan 4 turns on, blower 6 turns on, electronic water pump 9 automatically adjusts according to the superheat at the outlet of refrigeration unit 12, electronic water pumps 1 and 2 operate, ports C and B of five-way proportional valve 19 are connected, ports 2 and 5 of five-way proportional valve 20 are connected, ports 1 and 2 of three-way proportional valve 16 are connected, ports 1 and 3 of three-way proportional valve 217 are connected, and ports 1 and 3 of three-way proportional valve 318 are connected.

[0065] Exit condition: The air conditioner cooling switch is off or the knob is not in the cooling position.

[0066] 2.2 Battery Cooling

[0067] Applicable operating conditions: When the passenger compartment has no need for cooling or heating, and the battery temperature is too high, the air conditioning system needs to be used for cooling.

[0068] Activation conditions: The battery has a high maximum temperature and requires cooling.

[0069] Actions performed: Compressor 5 operates, fan 4 turns on, electronic water pump 2 10 automatically adjusts according to the superheat at the outlet of refrigeration unit 2 13, electronic water pump 1 9 and electronic water pump 3 11 operate, ports C and B of five-way proportional valve 1 19 are connected, ports A and D are connected, ports 1 and 4 of five-way proportional valve 2 20 are connected, ports 1 and 2 of three-way proportional valve 1 16 are connected, and ports 1 and 3 of three-way proportional valve 3 18 are connected.

[0070] Exit condition: Battery maximum is low, exit battery cooling mode.

[0071] 2.3 Crew Cabin & Battery Cooling

[0072] Applicable operating conditions: When the occupant compartment is turned on and the battery temperature is too high, both the occupant compartment and the battery pack need to be cooled.

[0073] Activation conditions: The air conditioner switch is on and the knob is turned to cooling, and the maximum battery temperature is high (e.g., >35℃), and the battery has a cooling requirement;

[0074] Actions executed: Compressor 5 operates, fan 4 turns on, blower 6 turns on, electronic water pump 1 9 automatically adjusts according to the superheat of the outlet of refrigeration unit 1 12, electronic water pump 2 10 automatically adjusts according to the superheat of the outlet of refrigeration unit 2 13, electronic water pump 1 9, electronic water pump 2 10, and electronic water pump 3 11 operate, ports C and B of five-way proportional valve 1 19 are connected, ports A and D are connected, ports 2 and 5 of five-way proportional valve 2 20 are connected, ports 1 and 4 are connected, ports 1 and 2 of three-way proportional valve 1 16 are connected, ports 1 and 3 of three-way proportional valve 2 17 are connected, and ports 1 and 3 of three-way proportional valve 3 18 are connected.

[0075] Exit conditions: The cooling switch is off, the knob is not in the cooling position, or the battery's maximum temperature is low and the battery does not require cooling.

[0076] (III) Heating Mode

[0077] 3.1 Crew Cabin Heating 1 (Pure PTC Heating)

[0078] Applicable operating conditions: When the ambient temperature is too low, the system has no residual heat, and the refrigerant cannot absorb heat from the coolant to heat the passenger compartment, it is necessary to use water PTC to heat the coolant and work with blower 6 to provide heat to the passenger compartment.

[0079] Activation conditions: The crew cabin heating switch is turned on, and the motor, battery, and ambient temperature are all very low, making it impossible to absorb heat through refrigerant phase change, so only PTC heating can be activated.

[0080] Actions executed: W-PTC starts working, blower 6 is turned on, electronic water pump 2 is turned on, ports 1 and 3 of three-way proportional valve 16 are connected, ports 1 and 2 of proportional three-way valve 2 are connected, and ports 2 and 5 of five-way proportional valve 20 are connected.

[0081] Exit conditions: The crew cabin heating switch is off, or the motor, battery, or ambient temperature is high, and the refrigerant can absorb heat from the motor, battery, or environment through phase change.

[0082] 3.2 Crew Cabin Heating 2 (Waste Heat Heat Pump + PTC Auxiliary)

[0083] Applicable operating conditions: When the ambient temperature is low and the battery or motor control temperature is high, the system has sufficient residual heat to absorb heat from the coolant.

[0084] Activation conditions: The crew compartment heating switch is turned on, the ambient temperature is high enough to absorb heat from the environment, and (motor outlet water temperature > ambient temperature, or battery outlet water temperature > ambient temperature).

[0085] Actions performed: Compressor 5 operates, electronic water pump 1 (9) and electronic water pump 2 (10) operate, electronic water pump 3 (11) starts in parking mode, fan 4 does not start, ports A and E of 5-way proportional valve 1 (19) are connected, ports C and D are connected, ports 2 and 5 of 5-way proportional valve 2 (20) are connected, ports 1 and 4 are connected, ports 1 and 3 of 3-way proportional valve 1 (16) are connected, ports 1 and 2 of 3-way proportional valve 2 (17) are connected, and electronic water pump 2 (10) automatically adjusts according to the superheat at the outlet of refrigeration unit 2 (13).

[0086] Exit conditions: The crew compartment heating switch is off, or the ambient temperature is too low to absorb heat from the environment, or (motor outlet water temperature ≤ ambient temperature -5℃, and battery outlet water temperature ≤ ambient temperature -5℃).

[0087] 3.3 Air Source Heat Pump + PTC Auxiliary

[0088] Applicable operating conditions: When the passenger compartment needs heating, and the battery or motor has insufficient residual heat, the ambient temperature is high, and the coolant can transfer heat to the air.

[0089] Activation conditions: The crew compartment heating switch is turned on, and the ambient temperature is ≥-15℃, and (motor outlet water temperature ≤ ambient temperature -5℃, or battery outlet water temperature ≤ ambient temperature -5℃).

[0090] Actions performed: Compressor 5 operates, electronic water pump 1 (9) and electronic water pump 2 (10) operate, fan 4 turns on, blower 6 turns on, ports A and B of 5-way proportional valve 1 (19) are connected, ports C and D are connected, ports 5 and 2 of 5-way proportional valve 2 (20) are connected, ports 1 and 4 are connected, ports 1 and 3 of 3-way proportional valve 1 (16) are connected, ports 1 and 2 of 3-way proportional valve 2 (17) are connected, ports 1 and 2 of 3-way proportional valve 3 (18) are connected, and electronic water pump 2 (10) automatically adjusts according to the superheat at the outlet of refrigeration unit 2 (13).

[0091] Exit conditions: The crew compartment heating switch is off, or the ambient temperature is too low to absorb heat from the ambient temperature, or (motor outlet water temperature > ambient temperature, and battery outlet water temperature > ambient temperature).

[0092] 3.4 Battery Heating 1 (Pure PTC Heating)

[0093] Applicable operating conditions: When the ambient temperature is too low, it affects the battery's lifespan, so it needs to be heated. At this time, the motor system has no residual heat, so the W-PTC needs to be turned on for heating.

[0094] Activation conditions: The minimum battery temperature is low, and the motor and electronic control temperatures are also low, so heat cannot be obtained from the motor and electronic control.

[0095] Actions executed: Electronic water pump 2 (10) and electronic water pump 3 (11) operate; ports 1 and 3 of three-way proportional valve 1 (16) are connected; ports 1 and 2 of three-way proportional valve 2 (17) are connected; ports A and D of five-way proportional valve 1 (19) are connected; ports 1 and 2 and ports 4 and 5 of five-way proportional valve 2 (20) are connected; W-PTC starts heating.

[0096] Exit conditions: If the minimum battery temperature is too high, the battery will exit the heating mode; or if the motor and electronic control temperature is too high, heat can be absorbed from the motor and electronic control, then the pure PTC heating mode will be exited.

[0097] 3.5 Battery Heating 2 (Residual Heat + PTC Auxiliary Heating)

[0098] Applicable operating conditions: When the ambient temperature is too low, it affects the battery's lifespan, so it needs to be heated. At this time, the motor system has residual heat, and the W-PTC will be turned on as needed.

[0099] Activation conditions: The minimum battery temperature is low and there is a need for heating, while the motor and electronic control temperature is high and there is residual heat that can be recovered.

[0100] Actions performed: Electronic water pump 1 (9) and electronic water pump 2 (10) operate; electronic water pump 3 (11) starts according to the difference between the target water temperature and the motor outlet water temperature; A and E of five-way proportional valve 1 (19) are connected, and C and D are connected; ports 1 and 2 of five-way proportional valve 2 (20) are connected, and ports 4 and 5 are connected (ports 1 and 4 are connected, and ports 5 and 2 are connected when the target water temperature and the motor outlet water temperature are the same); ports 1 and 3 of three-way proportional valve 1 (16) are connected; and ports 1 and 2 of three-way proportional valve 2 (17) are connected.

[0101] Exit conditions: The minimum battery temperature is too high, causing the battery to exit heating mode; or the motor and electronic control temperature is too low, leaving no residual heat available.

[0102] 3.6 Passenger cabin & battery heating (pure PTC heating)

[0103] Compared to 3.4 Battery Heating 1 (Pure PTC Heating), only the passenger compartment heating switch is added, and the blower 6 is turned on.

[0104] 3.7 Crew compartment & battery heating (waste heat + PTC auxiliary heating)

[0105] Compared to the 3.5 battery heating 2 (waste heat + PTC auxiliary heating), the only addition is a crew cabin heating switch and the start of the blower 6.

[0106] (iv) Other modes

[0107] 4.1 Crew cabin heating & battery cooling modes

[0108] Applicable operating conditions: In winter or seasonal changes, the passenger compartment is in heating mode. After the vehicle is charging or driving under high load, the battery temperature rises under some extreme driving conditions, requiring cooling.

[0109] Activation conditions: The cab heating switch is on, and the battery temperature is high enough to require cooling.

[0110] Actions performed: Electronic water pump 2 10 and electronic water pump 3 11 operate; A and D of 5-way proportional valve 1 19 are connected; ports 1 and 4 of 5-way proportional valve 2 20 are connected; ports 2 and 5 are connected; ports 1 and 3 of 3-way proportional valve 1 16 are connected; ports 1 and 2 of 3-way proportional valve 2 17 are connected; compressor 5 is turned on; electronic water pump 2 10 automatically adjusts according to the superheat at the outlet of refrigeration unit 2 13.

[0111] Exit conditions: The maximum battery temperature is low, exiting the cooling mode, or the crew cabin heating switch is turned off.

[0112] 4.2 Battery heating & motor electronic control heat dissipation mode

[0113] Applicable operating conditions: The battery temperature is low, which affects the battery's lifespan, so it needs to be heated. At the same time, the motor and electronic control temperature is too high and needs to be dissipated.

[0114] Activation condition: The outlet water temperature of the motor and electronic control is high and requires heat dissipation.

[0115] Actions performed: Fan 4 is turned on, electronic water pump 1 9 and electronic water pump 3 11 are working, ports A and E of five-way proportional valve 1 19 are connected, port C is connected proportionally to ports B and D, ports 1 and 4 of five-way proportional valve 2 20 are connected, and ports 1 and 2 of three-way proportional valve 3 18 are connected.

[0116] Exit condition: The water temperature at the motor and electronic control outlet is low, so the cooling mode is exited.

[0117] Please see Figure 15 Secondly, a control method for a heat pump system of a new energy power system, used in the heat pump system of the new energy power system described in the first aspect, includes the following steps:

[0118] S1 monitors the temperature and operating conditions of the passenger compartment, battery pack, motor and electronic control system in real time;

[0119] Specifically, temperature sensors are used to monitor the temperature of the battery pack, motor, electronic control system, and passenger compartment in real time. Temperature and operational status information of the passenger compartment are obtained through status monitoring devices, such as air conditioning switches and heating / cooling demand buttons.

[0120] S2 activates the corresponding working mode based on the monitoring results;

[0121] Specifically, when the passenger compartment is detected to require cooling, such as when the air conditioning is turned on, the passenger compartment cooling mode is activated. If the battery temperature is too high and the ambient temperature is low (e.g., battery temperature above 28°C and ambient temperature below 10°C), the battery cooling mode is activated. When the ambient temperature is too low, such as below -15°C, the heating mode is activated, and W-PTC auxiliary heating is enabled.

[0122] S3 regulates the operation of compressor 5, refrigeration unit, W-PTC, electronic water pump unit, fan and proportional valve.

[0123] Specifically, the power of compressor 5 is adjusted according to cooling or heating needs, controlling the refrigerant flow and pressure. The refrigerant flow of the refrigeration units (such as refrigeration unit 12 and refrigeration unit 13) is regulated via electronic expansion valves to meet the cooling requirements of the passenger compartment and battery pack. When heating is required, the W-PTC unit is activated to provide heat to the passenger compartment. The operating frequency of the electronic water pump is adjusted to control the coolant circulation speed to adapt to different thermal management needs. The fan speed is adjusted according to heat dissipation requirements to enhance heat dissipation. The flow direction and distribution ratio of the coolant are controlled using proportional valves to ensure that each system receives appropriate cooling or heating.

[0124] The above-disclosed embodiment is merely a preferred embodiment of the heat pump system of a new energy power system of this utility model. Of course, it should not be construed as limiting the scope of the utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of this utility model still fall within the scope of the utility model.

Claims

1. A heat pump system for a new energy power system, characterized in that, It includes electronic water pump assembly, refrigeration unit assembly, electronic expansion valve assembly, three-way proportional valve assembly, five-way proportional valve assembly, cold air core, warm air core, radiator, fan, compressor, blower, water-cooled condenser, gas-liquid separator and expansion tank assembly; The electronic water pump unit is used for coolant circulation in the passenger compartment, battery pack, and motor control system, and adjusts the coolant flow direction and velocity to meet heat exchange requirements; the refrigeration unit is used to realize heat exchange between refrigerant and coolant, the electronic expansion valve unit is used for throttling and pressure reduction, adjusting the refrigerant saturation temperature to achieve phase change heat transfer, regulating refrigerant flow, and controlling cooling capacity output; the three-way proportional valve unit and the five-way proportional valve unit are used for precise proportional control of coolant flow direction; the cooling core absorbs heat from the coolant to cool the passenger compartment, and the heating core releases heat from the coolant to heat the passenger compartment; the radiator is used to dissipate the heat absorbed by the coolant into the environment, and the fan-assisted radiator removes heat by driving airflow; The compressor is used to transport the refrigerant; the blower is used to accelerate the heat exchange between the indoor heat exchanger and the air; the water-cooled condenser is used to dissipate heat from the refrigerant in summer and absorb heat in winter; the gas-liquid separator is used to separate the liquid and gas in the refrigerant; and the expansion tank assembly provides liquid to the coolant circuit and discharges gas.

2. The heat pump system of the new energy power system as described in claim 1, characterized in that, The electronic water pump assembly includes electronic water pump one, electronic water pump two, and electronic water pump three. Electronic water pump one, electronic water pump two, and electronic water pump three are respectively used to realize the circulation of coolant in the motor control, passenger compartment, and battery pack circuits.

3. The heat pump system of the new energy power system as described in claim 1, characterized in that, The refrigeration unit group includes refrigeration unit one and refrigeration unit two. Refrigeration unit one is responsible for refrigerating the crew cabin, while refrigeration unit two provides refrigeration for the battery pack and recovers waste heat from the motor and electronic control system.

4. The heat pump system of the new energy power system as described in claim 1, characterized in that, The electronic expansion valve assembly includes electronic expansion valve one and electronic expansion valve two. Electronic expansion valve one and electronic expansion valve two are used to control the refrigerant flow and adjust the cooling capacity of each part.

5. The heat pump system of the new energy power system as described in claim 1, characterized in that, The three-way proportional valve assembly includes three-way proportional valve one, three-way proportional valve two, and three-way proportional valve three. The three-way proportional valve one, the three-way proportional valve two, and the three-way proportional valve three are all used to achieve proportional control of coolant flow in different directions.

6. The heat pump system of the new energy power system as described in claim 1, characterized in that, The five-way proportional valve assembly includes a five-way proportional valve one and a five-way proportional valve two, both of which are used to achieve proportional control of coolant flow in different directions.

7. The heat pump system of the new energy power system as described in claim 1, characterized in that, The expansion tank assembly includes expansion tank one and expansion tank two, which are used to provide sufficient liquid to the coolant circuit and at the same time remove gas from the circuit.

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