Novel electric vehicle thermal management system based on hot reflux

Abstract

The invention discloses a novel electric vehicle heat management system based on heat reflux, which comprises a refrigerant loop and a cooling liquid loop, the refrigerant loop comprises a compressor, a gas-liquid separation liquid storage tank, a water chiller, a double-core heat regenerator, an external condenser, an in-cabin condenser and an in-cabin evaporator, the cooling liquid loop comprises an outboard radiator, a kettle, a battery, a second water pump, a control assembly and a motor. According to the novel electric vehicle thermal management system based on thermal reflux, the purpose of meeting the cabin heating and battery heating requirements without depending on PTC in a low-temperature environment is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle thermal management, in particular to a novel electric vehicle thermal management system based on heat reflux. Background Art

[0002] In recent years, with the rapid development of new energy vehicles in my country, electric vehicles have been heated by thermal management systems. Domestically, the coolant side or cabin high-pressure PTC (Positive Temperature Coefficient) is usually added to the heat pump air conditioning system to make up for the lack of low-temperature heat. Some foreign brands increase the enthalpy level of the compressor intake by jet enthalpy increase or hot gas bypass of high-energy material flow.

[0003] Whether it is the coolant side or the cabin high-voltage PTC, there is a certain risk of high-voltage leakage, and the electronic control is complex, the layout space is large, and the cost is high.

[0004] Whether it is jet enthalpy increase or hot gas bypass technology, the refrigerant at the compressor outlet directly enters the condenser in the cabin, resulting in large temperature fluctuations, which will make it difficult to achieve precise temperature control in the multi-zone air conditioning in the cabin.

[0005] In view of the above shortcomings, a new electric vehicle heating system based on heat reflux was invented. The heat reflux method is used to increase the enthalpy level at the compressor inlet, and the comprehensive thermal management of electric vehicles under different working conditions is achieved through the management and control of the refrigerant system and the management and control of the multi-way valve of the coolant system. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies of the prior art, the present invention provides a new electric vehicle thermal management system based on heat reflux, which solves the problem of meeting the cabin heating and battery heating needs in a low temperature environment without relying on PTC.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a new electric vehicle thermal management system based on heat reflux, including a refrigerant circuit, the refrigerant circuit includes a compressor, a water-cooled condenser, a cabin condenser and a heat regenerator, and the heat regenerator is connected in series between the compressor compressor and the cabin condenser.

[0010] The compressor is connected to the heat regenerator, the heat regenerator is connected to a water-cooled condenser, the water-cooled condenser is connected to the cabin condenser; the heat regenerator is connected to the cabin condenser.

[0011] Preferably, the refrigerant circuit also includes a double-core heat exchanger, a gas-liquid separation liquid storage tank, a chiller, an external condenser, and an in-cabin evaporator, and the double-core heat exchanger is used to replace and.

[0012] The compressor is connected to the dual-core heat regenerator, the dual-core heat regenerator is connected to the cabin condenser, the cabin condenser is connected to the external condenser, the cabin condenser is connected to the chiller and the cabin evaporator, the external condenser is connected to the chiller and the cabin evaporator, the chiller and the cabin evaporator are connected to the gas-liquid separation liquid storage tank, and the gas-liquid separation liquid storage tank is connected to the compressor, and the two ends of the cabin evaporator are connected to the compressor in three parallel connections through an electronic expansion valve and a one-way valve;

[0013] Preferably, the refrigerant circuit is connected to a coolant circuit, and the coolant circuit includes an offboard radiator, a kettle, a battery, a second water pump, a control component and a motor. The second water pump, the control component and the motor are connected in series and connected to the double-core heat exchanger through either a nine-way valve or a six-way valve. The battery is connected to the double-core heat exchanger through a nine-way valve or a six-way valve. The offboard radiator and the kettle are connected in series with each other and connected to the double-core heat exchanger through either a nine-way valve or a six-way valve. The nine-way valve or the six-way valve is connected to the chiller through water pump one.

[0014] Preferably, both ends of the chiller are connected in parallel to the compressor via an electronic release valve three and a one-way valve four, and an electronic release valve two and a one-way valve two are arranged in parallel between the double-core heat regenerator and the compressor.

[0015] Preferably, an electronic release valve 1 and a one-way valve 1 are arranged in series between the in-cabin condenser and the external condenser, and an electromagnetic valve is connected in parallel.

[0016] Preferably, the nine-way valve is used for mode switching.

[0017] Preferably, the battery is used to power the system.

[0018] (III) Beneficial effects

[0019] The present invention provides a new electric vehicle thermal management system based on heat reflux. Compared with the prior art, it has the following beneficial effects:

[0020] This new electric vehicle thermal management system based on heat reflux solves the problem of insufficient low-temperature heat source or no heat source for heating in electric vehicles, improves the versatility, standardization, and scalability of the thermal management system of electric vehicles, and uses waste heat to adjust the temperature in summer to reduce the energy consumption of electric vehicle temperature zone temperature adjustment. In winter, under low-temperature conditions, it combines the heat pump system and the compressor to heat, replacing the high-pressure PTC heating to achieve cabin heating and battery heating; eliminates the safety hazards brought by high-pressure PTC, reduces system complexity, and simplifies the design of air-conditioning boxes. The heat release of the regenerator and water-cooled condenser, or the heat release of the dual-core regenerator, makes the heat release of the cabin condenser in the phase change zone, the condensation temperature is stable, and the precise control of the temperature in multiple zones of the cabin is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the system of the present invention;

[0022] Figure 2 This is a schematic diagram of Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of Embodiment 2 of the present invention;

[0024] Figure 4 This is a schematic diagram of Embodiment 3 of the present invention;

[0025] Figure 5 This is a schematic diagram of Embodiment 4 of the present invention;

[0026] Figure 6 This is a schematic diagram of Embodiment 5 of the present invention;

[0027] Figure 7 This is a schematic diagram of Example 6 of the present invention.

[0028] In the figure: 1. compressor; 2. double-core regenerator; 3. cabin condenser; 4. electronic release valve 1; 5. external condenser; 6. one-way valve 1; 7. solenoid valve; 8. electronic release valve 2; 9. one-way valve 2; 10. electronic expansion valve; 11. cabin evaporator; 12. one-way valve 3; 13. electronic release valve 3; 14. chiller; 15. one-way valve 4; 16. gas-liquid separation storage tank; 17. nine-way valve; 18. external radiator; 19. kettle; 20. water pump 1; 21. battery; 22. water pump 2; 23. control component; 24. motor; A. regenerator; B. water-cooled condenser; C. six-way valve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-7 The present invention provides a technical solution: a new electric vehicle thermal management system based on heat reflux, including a refrigerant circuit and a coolant circuit, the refrigerant circuit includes a compressor 1, a water-cooled condenser B, a cabin condenser 3 and a regenerator A, the regenerator A is connected in series between the compressor 1 and the cabin condenser 3, the compressor 1 is connected to the regenerator A, the regenerator A is connected to the water-cooled condenser B, the water-cooled condenser B is connected to the cabin condenser 3, the regenerator A is connected to the cabin condenser 3, the refrigerant circuit also includes a double-core regenerator 2, a gas-liquid separation liquid storage tank 16, a chiller 14, an external condenser 5, and a cabin evaporator 11, the double-core regenerator 2 is used to replace A and B, the compressor 1 is connected to the double-core regenerator 2, the double-core regenerator 2 is connected to the cabin condenser 3, the cabin The condenser 3 is connected to the external condenser 5, the cabin condenser 3 is connected to the chiller 14 and the cabin evaporator 11, the external condenser 5 is connected to the chiller 14 and the cabin evaporator 11, the chiller 14 and the cabin evaporator 11 are connected to the gas-liquid separation liquid storage tank 16, and the gas-liquid separation liquid storage tank 16 is connected to the compressor 1, the two ends of the cabin evaporator 11 are connected to the compressor 1 in parallel through the electronic expansion valve 10 and the one-way valve three 12, the two ends of the chiller 14 are connected to the compressor 1 in parallel through the electronic release valve three 13 and the one-way valve four 15, an electronic release valve two 8 and a one-way valve two 9 are arranged in parallel between the double-core heat exchanger 2 and the compressor 1, an electronic release valve one 4 and a one-way valve one 6 are arranged in series between the cabin condenser 3 and the external condenser 5, and a solenoid valve 7 is connected in parallel.

[0031] The coolant circuit includes an off-board radiator 18, a kettle 19, a battery 21, a water pump 22, a control component 23 and a motor 24. The water pump 22, the control component 23 and the motor 24 are connected in series and are connected to the dual-core heat exchanger 2 through either the nine-way valve 17 or the six-way valve C. The battery 21 is connected to the dual-core heat exchanger 2 through the nine-way valve 17 or the six-way valve C. The off-board radiator 18 and the kettle 19 are connected in series with each other and are connected to the dual-core heat exchanger 2 through either the nine-way valve 17 or the six-way valve C. The nine-way valve 17 or the six-way valve C is connected to the chiller 14 through the water pump 20.

[0032] Further preferably, the nine-way valve 17 is used for mode switching, and the battery 21 is used for powering the system.

[0033] Replace the double core regenerator 2 with the regenerator A Example 1, see Figure 2 The new electric vehicle heating system based on heat reflux consists of: 1. compressor, A. regenerator, 3. cabin condenser, 8. gas-liquid separation storage tank, 10. electronic expansion valve.

[0034] According to the reverse Carnot cycle principle, the regenerator A acts as both a condenser and an evaporator, with the high-pressure side acting as the condenser and the low-pressure side acting as the evaporator. The large temperature difference and large heat flow between the high-pressure side and the low-pressure side are used to perform heat reflux, so that the heat on the high-pressure side is efficiently transferred to the low-pressure side. In the case of insufficient or no low-temperature heat source, the low-pressure heat source is replaced to prioritize the stable operation of the reverse Carnot cycle of the refrigerant system. The cabin condenser dissipates the excess heat generated by the system into the environment to meet the low-temperature heating needs of the cabin.

[0035] Replace the double core regenerator 2 with regenerator A Example 2, see Figure 3 The new electric vehicle heating system based on heat reflux consists of: 1. compressor, A. regenerator, 3. cabin condenser, 10. electronic expansion valve, 8. gas-liquid separation storage tank.

[0036] When the system is running stably, the heat exchange area of ​​the regenerator A is fixed. When the state of the cabin condenser 3 changes, it can only be adjusted by controlling the speed of the compressor 1 and the two electronic expansion valves 10. The frequent changes in the speed of the compressor 1 cause the system to re-establish balance and it is difficult to respond to the changes in the state of the cabin condenser 3. Figure 3 As shown, two electronic expansion valves 10 are added to the enthalpy compensation circuit. By adjusting the opening of the two electronic expansion valves 10, the system heat reflux flow is controlled to adapt to the change of the state of the condenser in the cabin.

[0037] Replace the double core regenerator 2 with regenerator A Example 3, see Figure 4 The new electric vehicle heating system based on heat reflux consists of: 1. compressor, A. regenerator, 3. cabin condenser, 6. one-way valve 1, 8. gas-liquid separation storage tank, 9. one-way valve 2, 10. electronic expansion valve, 14. chiller.

[0038] Waste heat recovery of electric vehicles is an important means to improve the endurance of electric vehicles in winter. Figure 4 As shown, a chiller 14 is added to the heating system to absorb heat from the coolant circuit, cool the heat-generating components such as the battery 21 and the motor 24, and recover waste heat.

[0039] Replace the double core regenerator 2 with regenerator A, and add water-cooled condenser B Example 4, please refer to Figure 5 The new electric vehicle heating system based on heat reflux consists of: 1. compressor, A. regenerator, B. water-cooled condenser, 3. cabin condenser, 6. one-way valve 1, 8. gas-liquid separation storage tank, 9. one-way valve 2, 10. electronic expansion valve, 14. chiller.

[0040] In a low temperature environment, in order to quickly raise the battery temperature to the optimal operating temperature, a water-cooled condenser B is connected in series on the high-pressure side to release heat into the battery coolant circuit to heat the battery 21 .

[0041] The double core regenerator 2 is replaced by the regenerator A, and the nine-way valve 17 is replaced by the six-way valve C. Example 4, please refer to Figure 6 The new electric vehicle heating system based on heat reflux consists of: 1. compressor; A. recuperator; 3. cabin condenser; 4. electronic release valve 1; 5. external condenser; 6. one-way valve 1; 7. solenoid valve; 8. electronic release valve 2; 9. one-way valve 2; 10. electronic expansion valve; 11. cabin evaporator; 12. one-way valve 3; 13. electronic release valve 3; 14. chiller; 16. gas-liquid separation storage tank; C. six-way valve; 18. external radiator; 19. kettle; 20. water pump 1; 21. battery; 22. water pump 2; 23. control component; 24. motor.

[0042] When there is a need for heating in the cabin in the system refrigerant circuit, the throttling expansion is performed through the electronic release valve 4, and the external condenser 5 is used as an off-cabin evaporator, and the heat pump system absorbs heat from outside the cabin. The chiller 14 absorbs heat from the coolant of the battery 21, the motor 24, etc., and recovers the waste heat.

[0043] When the ambient temperature drops and the heat absorbed by the off-board evaporator and the chiller 14 cannot keep the system running stably, the opening ratio of the electronic release valve 2 8 and the electronic release valve 3 13 is adjusted, and the flow rate is adjusted by the opening of the electronic release valve 2 8 to control the heat reflux.

[0044] When the ambient temperature is lower than the refrigerant evaporation temperature, the electronic release valve 4 is closed and the solenoid valve 7 is opened, and the compressor 1 performs work to generate heat and recover waste heat to meet the cabin heating needs.

[0045] When the cabin and the battery 21 need to be cooled, the electronic release valve 1 4 is opened to the maximum opening, the solenoid valve 7 is closed, and the electronic release valve 2 8 is closed at the same time. The electronic release valve 3 13 and the electronic expansion valve 10 perform throttling expansion respectively, and the cabin evaporator 11 realizes cabin cooling and the chiller 14 realizes battery 21 cooling.

[0046] By switching the mode of the six-way valve C, the water pump 20, the battery 21, the control component 23, the motor 24 and the dual-core heat exchanger 2 are connected. The system heats the battery 21 through the heat generated by the dual-core heat exchanger 2 and the motor 24. When waste heat recovery is required, the six-way valve C switches the mode, and the water pump 20, the chiller 14, the battery 21, the water pump 22, the control component 23 and the motor 24 circuits are connected and circulated. When the battery 21 is passively cooled, the six-way valve C switches the mode, and the cabin radiator is connected with the battery 21 and the motor 24 cooling circuit to release heat to the cabin air. When the battery 21 is actively cooled, the six-way valve C switches the mode, and the water pump 22, the control component 23, the motor 24 and the cabin radiator constitute a high-temperature passive cooling circuit, and the cabin radiator is cooled by the cabin radiator. The chiller 14, the water pump 20 and the battery 21 constitute an active cooling circuit, and the chiller 14 absorbs heat and releases it to the cabin air through the external condenser 5.

[0047] Replace the double core regenerator 2 with regenerator A and add water-cooled condenser B Example 5, please refer to Figure 7 The new electric vehicle heating system based on heat reflux consists of: 1. compressor; A. regenerator; B. water-cooled condenser; 3. cabin condenser; 4. electronic release valve 1; 5. external condenser; 6. one-way valve 1; 7. solenoid valve; 8. electronic release valve 2; 9. one-way valve 2; 10. electronic expansion valve; 11. cabin evaporator; 12. one-way valve 3; 13. electronic release valve 3; 14. chiller; 16. gas-liquid separation storage tank; C. six-way valve; 18. outboard radiator; 19. kettle; 20. water pump 1; 21. battery; 22. water pump 2; 23. control component; 24. motor.

[0048] The water-cooled condenser B is connected in series. When the temperature is high, the coolant circuit and the refrigerant circuit can dissipate heat together to improve the heat exchange efficiency.

[0049] The double core regenerator 2 replaces the regenerator A and the water-cooled condenser B in Example 6. Figure 1 When the cabin needs to be heated, the electronic release valve 4 is used to throttle and expand, and the cabin condenser 3 is used as the cabin evaporator outside the cabin. As a heat pump system, it absorbs heat from outside the cabin. The chiller 14 absorbs heat from the coolant of the battery 21, the motor 24, etc. to recover the waste heat.

[0050] When the ambient temperature drops and the heat absorbed by the off-board evaporator and the chiller 14 cannot keep the system running stably, the opening ratio of the electronic release valve 2 8 and the electronic release valve 3 13 is adjusted, and the flow rate is adjusted by the opening of the electronic release valve 2 8 to control the heat reflux.

[0051] When the ambient temperature is lower than the refrigerant evaporation temperature, the electronic release valve 4 is closed and the solenoid valve 7 is opened, and the compressor 1 performs work to generate heat and recover waste heat to meet the cabin heating needs.

[0052] When the cabin and the battery 21 need to be cooled, the electronic release valve 1 4 is opened to the maximum opening, the solenoid valve 7 is closed, and at the same time the electronic release valve 2 8 is closed, the electronic release valve 3 13 and the electronic expansion valve 10 perform throttling expansion respectively, and the cabin evaporator 11 realizes cabin cooling and the water chiller realizes battery 21 cooling.

[0053] By switching the mode of the nine-way valve 17, the water pump 1 20, the battery 21, the control component 23, the motor 24 and the dual-core heat regenerator 2 are connected. The system heats the battery 21 through the heat generated by the dual-core heat regenerator 2 and the motor 24. When waste heat recovery is required, the nine-way valve 17 switches the mode, and the water pump 1 20, the chiller 14, the battery 21, the water pump 22, the control component 23 and the motor 24 are connected and circulated. When the battery 21 is passively cooled, the nine-way valve 17 switches the mode, and the cabin radiator 18 is connected with the battery 21 and the motor 24 cooling circuit. Heat is released into the air outside the cabin. When the battery 21 is actively cooled, the nine-way valve 17 switches the mode, and the water pump 22, the control component 23, the motor 24 and the radiator outside the cabin 18 form a high-temperature passive cooling circuit, and the temperature is reduced by the radiator outside the cabin 18; the water pump 1 20, the chiller 14 and the battery 21 form an active cooling circuit, and the chiller 14 absorbs heat and releases it to the air outside the cabin through the external condenser 5. The dual-core heat exchanger 2 is connected in series. At high temperatures, the refrigerant system heat refluxes, the battery 21 is heated, and the refrigerant and coolant circuits jointly dissipate heat.

[0054] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new electric vehicle thermal management system based on heat reflux, characterized in that: The invention comprises a refrigerant circuit, wherein the refrigerant circuit comprises a compressor (1), a water-cooled condenser (B), an in-cabin condenser (3) and a regenerator (A), wherein the regenerator (A) is connected in series between the compressor (1) and the in-cabin condenser (3). The compressor (1) is connected to the heat regenerator (A), the heat regenerator (A) is connected to a water-cooled condenser (B), the water-cooled condenser (B) is connected to the cabin condenser (3), and the heat regenerator (A) is connected to the cabin condenser (3).

2. A new electric vehicle thermal management system based on heat reflux according to claim 1, characterized in that: The refrigerant circuit further comprises a double-core heat exchanger (2), a gas-liquid separation liquid storage tank (16), a chiller (14), an external condenser (5), and an in-cabin evaporator (11), wherein the double-core heat exchanger (2) is used to replace (A) and (B); The compressor (1) is connected to the double-core heat exchanger (2), the double-core heat exchanger (2) is connected to the cabin condenser (3), the cabin condenser (3) is connected to the external condenser (5), the cabin condenser (3) is connected to the water chiller (14) and the cabin evaporator (11), the external condenser (5) is connected to the water chiller (14) and the cabin evaporator (11), the water chiller (14) and the cabin evaporator (11) are connected to the gas-liquid separation liquid storage tank (16), and the gas-liquid separation liquid storage tank (16) is connected to the compressor (1), and the two ends of the cabin evaporator (11) are connected in parallel to the compressor (1) through the electronic expansion valve (10) and the one-way valve three (12).

3. According to claim 1, a new electric vehicle thermal management system based on heat reflow is characterized in that: The refrigerant circuit is connected to a coolant circuit, and the coolant circuit includes an off-board radiator (18), a kettle (19), a battery (21), a second water pump (22), a control component (23) and a motor (24). The second water pump (22), the control component (23) and the motor (24) are connected in series and are connected to the double-core heat exchanger (2) through either a nine-way valve (17) or a six-way valve (C). The battery (21) is connected to the double-core heat exchanger (2) through the nine-way valve (17) or the six-way valve (C). The off-board radiator (18) and the kettle (19) are connected in series with each other and are connected to the double-core heat exchanger (2) through either a nine-way valve (17) or a six-way valve (C). The nine-way valve (17) or the six-way valve (C) is connected to the chiller (14) through the first water pump (20).

4. According to claim 2, a new electric vehicle thermal management system based on heat reflow is characterized in that: The two ends of the water chiller (14) are connected in parallel to the compressor (1) via an electronic release valve three (13) and a one-way valve four (15), and an electronic release valve two (8) and a one-way valve two (9) are arranged in parallel between the double-core heat regenerator (2) and the compressor (1).

5. According to claim 2, a new electric vehicle thermal management system based on heat reflow is characterized in that: An electronic release valve (4) and a one-way valve (6) are arranged in series between the cabin condenser (3) and the external condenser (5), and a solenoid valve (7) is connected in parallel.

6. The new electric vehicle thermal management system based on heat reflow according to claim 3 is characterized by: The nine-way valve (17) is used for mode switching.

7. The new electric vehicle thermal management system based on heat reflow according to claim 3 is characterized by: The battery (21) is used to power the system.

Images