Integrated whole vehicle dual air conditioning thermal management system for electric bus

Abstract

The utility model provides a kind of electric bus integrated whole car double air conditioner thermal management system, including electric drive cooling pipe system, battery cooling pipe system, front air conditioning unit and rear air conditioning unit;Battery cooling pipe system is connected with second water pump, battery box cooling module, first battery water-cooled plate exchange, second battery water-cooled plate exchange, first battery water-cooled plate exchange and second battery water-cooled plate exchange are in parallel, the refrigerant side of first battery water-cooled plate exchange and second battery water-cooled plate exchange can be respectively parallel with the refrigerant circulation pipeline of front and rear air conditioning unit;Electric drive cooling pipe system is connected with first water pump, electric drive cooling module, first electric drive radiator, second electric drive radiator, first waste heat enthalpy plate exchange, second waste heat enthalpy plate exchange and solenoid valve assembly, solenoid valve assembly can control electric drive cooling pipe system switches between first state and second state, in first state, electric drive can be cooled, in second state, electric drive can be cooled while recycling electric drive waste heat.

Description

Technical Field

[0001] This utility model relates to the technical field of thermal management systems for electric buses, and more specifically, to an integrated dual-air conditioning thermal management system for electric buses. Background Technology

[0002] Currently, most pure electric bus air conditioning systems only integrate battery cooling functions, while electric drive cooling is generally handled by a separate heat dissipation system. Even if a small number of pure electric buses integrate electric drive cooling, the heat dissipation capacity of the individual air conditioning unit is limited, so it can only meet the needs of models under 13 meters. For models over 13 meters, a thermal management system integrating battery water cooling and electric drive water cooling is required, which cannot be met by a single air conditioning unit.

[0003] In view of this, the applicant hereby submits this application after studying the existing technology. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an integrated dual-air conditioning thermal management system for electric buses, including an electric drive cooling pipe system, a battery cooling pipe system, a front air conditioning unit, and a rear air conditioning unit. Both the front air conditioning unit and the rear air conditioning unit have a compressor, a reversing valve, an outdoor heat exchanger, and an indoor heat exchanger. The battery cooling piping system is connected to a second water pump, a battery box cooling module, a first battery water-cooled heat exchanger, and a second battery water-cooled heat exchanger via pipelines. The first battery water-cooled heat exchanger and the second battery water-cooled heat exchanger are connected in parallel. One end of the refrigerant side of the first battery water-cooled heat exchanger is connected to the reversing valve of the front air conditioning unit, and the other end is connected to the pipeline between the outdoor heat exchanger and the indoor heat exchanger of the front air conditioning unit. One end of the refrigerant side of the second battery water-cooled heat exchanger is connected to the reversing valve of the rear air conditioning unit, and the other end is connected to the pipeline between the outdoor heat exchanger and the indoor heat exchanger of the rear air conditioning unit. The electric drive cooling pipe system is connected by pipes to a first water pump, an electric drive cooling module, a first electric drive radiator, a second electric drive radiator, a first waste heat enthalpy-increasing plate heat exchanger, a second waste heat enthalpy-increasing plate heat exchanger, and a solenoid valve assembly. The solenoid valve assembly can control the electric drive cooling pipe system to switch between a first state and a second state. In the first state, the electric drive cooling pipe system is connected to the first water pump, the electric drive cooling module, the first electric drive radiator and the second electric drive radiator, and the first electric drive radiator and the second electric drive radiator are connected in parallel. The first electric drive radiator can dissipate heat through the fan of the outdoor heat exchanger of the front air conditioning unit, and the second electric drive radiator can dissipate heat through the fan of the outdoor heat exchanger of the rear air conditioning unit. In the second state, the electric drive cooling pipe system is connected to the first water pump, the electric drive cooling module, the first waste heat enthalpy-increasing plate heat exchanger, and the second waste heat enthalpy-increasing plate heat exchanger. The first waste heat enthalpy-increasing plate heat exchanger and the second waste heat enthalpy-increasing plate heat exchanger are connected in parallel. The refrigerant side of the first waste heat enthalpy-increasing plate heat exchanger is connected in parallel with the outdoor heat exchanger of the front air conditioning unit, and the refrigerant side of the second waste heat enthalpy-increasing plate heat exchanger is connected in parallel with the outdoor heat exchanger of the rear air conditioning unit.

[0005] As a further optimization, the battery valve assembly includes two first solenoid valves and two second solenoid valves. The two first solenoid valves are respectively located at the inlet ends of the first electric drive heat sink and the second electric drive heat sink, and the two second solenoid valves are respectively located at the inlet ends of the first waste heat enthalpy plate heat exchanger and the second waste heat enthalpy plate heat exchanger.

[0006] As a further optimization, the electric drive cooling piping system also includes a first expansion tank, which is connected to the inlet end of the first water pump via a branch pipe.

[0007] As a further optimization, a first electronic expansion valve is provided at the inlet end of both the first waste heat enthalpy-increasing plate refrigerant side and the second waste heat enthalpy-increasing plate refrigerant side.

[0008] As a further optimization, the battery cooling piping system also includes a second expansion tank, which is connected to the inlet of the second water pump via a branch pipe.

[0009] As a further optimization, a second electronic expansion valve is provided at the inlet end of the first battery water-cooled plate on the refrigerant side and at the inlet end of the second battery water-cooled plate on the refrigerant side.

[0010] As a further optimization, a control module is also included, which is used to detect the system temperature and control the operation of the system.

[0011] By adopting the above technical solution, the present invention can achieve the following technical effects: 1. It integrates the air conditioning, electric drive cooling system and battery cooling system to perform thermal management of the whole vehicle. The high degree of integration saves space in the overall vehicle design.

[0012] 2. The electric drive cooling pipe system is equipped with a first waste heat enthalpy-increasing plate heat exchanger and a second waste heat enthalpy-increasing plate heat exchanger. In the second state, the front air conditioning unit and the rear air conditioning unit are in heating mode. The cooling medium of the electric drive cooling pipe system flows through the waste heat enthalpy-increasing plate heat exchanger and exchanges heat with the refrigerant flowing through the waste heat enthalpy-increasing plate heat exchanger. After part of the refrigerant increases in enthalpy, it returns to the compressor return port of the air conditioner, reducing the compressor load and thus achieving the effect of energy saving.

[0013] 3. A front air conditioning unit and a rear air conditioning unit are set up. The two air conditioning units operate independently and are connected in parallel in the electric drive cooling pipe system and the battery cooling pipe system. They can cool or heat the passenger compartment at the same time, and work together to cool the electric drive and battery, meeting the water-cooled temperature control requirements of large vehicles and high-capacity electric drive and battery. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall layout structure of an integrated dual-air conditioning thermal management system for an electric bus according to this utility model. Figure 2 This is a schematic diagram of an integrated dual-air conditioning thermal management system for an electric bus according to this utility model. The diagram is labeled as follows: 1-Front air conditioning unit; 10-Rear air conditioning unit; 11-Compressor; 12-Reversing valve; 13-Outdoor heat exchanger; 14-Indoor heat exchanger; 2-Electric drive cooling piping system; 21-First water pump; 22-Electric drive cooling module; 23-First electric drive radiator; 24-Second electric drive radiator; 25-First waste heat enthalpy-increasing plate heat exchanger; 26-Second waste heat enthalpy-increasing plate heat exchanger; 27-First solenoid valve; 28-Second solenoid valve; 29-First expansion tank; 20-First electronic expansion valve; 3-Battery cooling piping system; 31-Second water pump; 32-Battery box cooling module; 33-First battery water-cooled plate heat exchanger; 34-Second battery water-cooled plate heat exchanger; 35-Second expansion tank; 36-Second electronic expansion valve. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0017] Example Depend on Figure 1 , Figure 2 As shown in the figure, this utility model embodiment provides an integrated dual-air conditioning thermal management system for an electric bus, including an electric drive cooling pipe system, a battery cooling pipe system, a front air conditioning unit, and a rear air conditioning unit. In this embodiment, water is used as the cooling medium for the electric drive cooling pipe system and the battery cooling pipe system.

[0018] Both the front and rear air conditioning units utilize existing heat pump air conditioners, each equipped with a compressor 11, a reversing valve 12, an outdoor heat exchanger 13, an indoor heat exchanger 14, a throttling valve, and a gas-liquid separator. The front and rear air conditioning units operate independently, and the dual-unit operation can meet the cooling or heating needs of large vehicles. In cooling mode, the outdoor heat exchanger 13 acts as a condenser, and the indoor heat exchanger 14 acts as an evaporator. Refrigerant pumped from the compressor 11 first passes through the outdoor heat exchanger 13, then through the indoor heat exchanger 14, and finally returns to the compressor 11, forming a cooling cycle. In heating mode, the indoor heat exchanger 14 acts as a condenser, and the outdoor heat exchanger 13 acts as an evaporator. The reversing valve 12 reverses the flow, allowing refrigerant to flow from the compressor 11, first through the indoor heat exchanger 14, then through the outdoor heat exchanger 13, and finally back to the compressor 11, forming a heating cycle. This is existing technology; the specific working process and principle are not detailed here. Understandably, both the outdoor heat exchanger 13 and the indoor heat exchanger 14 have fans.

[0019] The battery cooling piping system is connected to a second water pump 31, a battery box cooling module 32, a first battery water-cooled plate heat exchanger 33, and a second battery water-cooled plate heat exchanger 34 via pipelines. The first battery water-cooled plate heat exchanger 33 and the second battery water-cooled plate heat exchanger 34 are connected in parallel. The first battery water-cooled plate heat exchanger 33 and the second battery water-cooled plate heat exchanger 34 adopt existing plate heat exchangers. It can be understood that the plate heat exchanger has a heat medium side and a cold medium side. The battery cooling piping system is connected to the heat medium side of the first battery water-cooled plate heat exchanger 33 and the second battery water-cooled plate heat exchanger 34. One end of the refrigerant side of the first battery water-cooled plate heat exchanger 33 is connected to the reversing valve 12 of the front air conditioning unit, and the other end is connected to the pipeline between the outdoor heat exchanger 13 and the indoor heat exchanger 14 of the front air conditioning unit. In the air conditioning cooling mode, the refrigerant side of the first battery water-cooled plate heat exchanger 33 is connected in parallel with the indoor heat exchanger 14 of the front air conditioning unit. In the air conditioning heating mode, the refrigerant side of the first battery water-cooled plate heat exchanger 33 is connected in parallel with the outdoor heat exchanger 13 of the front air conditioning unit through the reversing of the reversing valve 12 of the front air conditioning unit. One end of the refrigerant side of the second battery water-cooled heat exchanger 34 is connected to the reversing valve 11 of the rear air conditioning unit, and the other end is connected to the pipeline between the outdoor heat exchanger 13 and the indoor heat exchanger 14 of the rear air conditioning unit. In the air conditioning cooling mode, the refrigerant side of the second battery water-cooled heat exchanger 34 is connected in parallel with the indoor heat exchanger 14 of the rear air conditioning unit. In the air conditioning heating mode, the refrigerant side of the second battery water-cooled heat exchanger 34 is connected in parallel with the outdoor heat exchanger 13 of the rear air conditioning unit through the reversing of the reversing valve 12 of the rear air conditioning unit. The battery box cooling module 32 is installed inside the battery box for cooling the battery. When water flows through the heat medium side of the first battery water-cooling plate heat exchanger 33 and the second battery water-cooling plate heat exchanger 34, it exchanges heat with the air conditioning refrigeration system flowing through the refrigerant side of the first battery water-cooling plate heat exchanger 33 and the second battery water-cooling plate heat exchanger 34. After cooling, it is driven by the second water pump 31 into the battery box cooling module 32 to cool the battery before flowing back to the battery water-cooling plate heat exchanger to continue the next cycle, thus forming a battery water-cooling cycle.

[0020] The electric drive cooling system is connected via pipes to a first water pump 21, an electric drive cooling module 22, a first electric drive radiator 23, a second electric drive radiator 24, a first waste heat enthalpy-increasing plate heat exchanger 25, a second waste heat enthalpy-increasing plate heat exchanger 26, and a solenoid valve assembly. The solenoid valve assembly controls the switching of the electric drive cooling system between a first state and a second state. The first waste heat enthalpy-increasing plate heat exchanger 25 and the second waste heat enthalpy-increasing plate heat exchanger 26 are existing plate heat exchangers with a heat medium side and a refrigerant side. It is understood that the electric drive cooling system is connected to the heat medium side of the first waste heat enthalpy-increasing plate heat exchanger 25 and the second waste heat enthalpy-increasing plate heat exchanger 26. The electric drive cooling module 22 is installed at the drive motor and the multi-function controller to cool the drive motor and the multi-function controller.

[0021] In the first state, the electric drive cooling system consists of the first water pump 21, the electric drive cooling module 22, the first electric drive radiator 23, and the second electric drive radiator 24 connected to form a circulating water circuit. The first electric drive radiator 23 and the second electric drive radiator 24 are connected in parallel. At this time, the first electric drive radiator 23 can dissipate heat through the fan of the outdoor heat exchanger 13 of the front air conditioning unit, and the second electric drive radiator 24 can dissipate heat through the fan of the outdoor heat exchanger 13 of the rear air conditioning unit. After being cooled by the fan, the water from the first electric drive radiator 23 and the second electric drive radiator 24 is then driven by the first water pump 21 into the electric drive cooling module 22 to cool the drive motor and the multi-function controller. In this application, the heat dissipation cores of the first electric drive radiator 23 and the second electric drive radiator 24 are respectively integrated into the outdoor heat exchangers 13 of the front and rear air conditioning units, and are layered vertically or horizontally with the original outdoor heat exchanger cores of the air conditioning units. While the fan dissipates heat from the outdoor heat exchanger cores, it can also dissipate heat from the heat dissipation cores of the electric drive radiators. This integration of electric drive water cooling pipe systems into the electric drive radiators saves the space required to install the electric drive radiators separately on the chassis, which is beneficial for optimizing the layout of other systems in new energy vehicles.

[0022] In the second state, the electric drive cooling system consists of the first water pump 21, the electric drive cooling module 22, the first waste heat enthalpy-increasing plate heat exchanger 25, and the second waste heat enthalpy-increasing plate heat exchanger 26, forming a circulating water circuit. The first waste heat enthalpy-increasing plate heat exchanger 25 and the second waste heat enthalpy-increasing plate heat exchanger 26 are connected in parallel. The refrigerant side of the first waste heat enthalpy-increasing plate heat exchanger 25 is connected in parallel with the outdoor heat exchanger 13 of the front air conditioning unit, and the refrigerant side of the second waste heat enthalpy-increasing plate heat exchanger 26 is connected in parallel with the outdoor heat exchanger 13 of the rear air conditioning unit. At this time, the air conditioner is in heating mode. A portion of the refrigerant condensed by the indoor heat exchanger 14 flows into the refrigerant side of the waste heat enthalpy-increasing plate heat exchanger, where it exchanges heat and increases enthalpy with the water flowing through the heat exchanger's heat transfer medium side. The refrigerant then returns to the compressor's return port, thus recovering the waste heat from the electric drive system. This waste heat is used to increase the compressor's enthalpy, reducing the compressor load and achieving energy savings.

[0023] Specifically, the solenoid valve assembly includes two first solenoid valves 27 and two second solenoid valves 28. The two first solenoid valves 27 are respectively located at the inlet ends of the first electric drive radiator 23 and the second electric drive radiator 24, and the two second solenoid valves 28 are respectively located at the inlet ends of the first waste heat enthalpy plate heat exchanger 25 and the second waste heat enthalpy plate heat exchanger 26. In the first state, the first solenoid valve 27 is open and the second solenoid valve 28 is closed; in the second state, the first solenoid valve 27 is closed and the second solenoid valve 28 is open, thereby controlling the on / off state of the electric drive radiator pipeline and the waste heat enthalpy plate heat exchanger pipeline through the solenoid valves, realizing the switching of the electric drive cooling system between the first state and the second state.

[0024] The electric drive cooling piping system also includes a first expansion tank 29, which is connected to the inlet of the first water pump 21 via a branch pipe. The first expansion tank 29 is used for pressure stabilization and water replenishment of the electric drive cooling piping system.

[0025] Both the inlet end of the first waste heat enthalpy-increasing plate heat exchanger 25 on the refrigerant side and the inlet end of the second waste heat enthalpy-increasing plate heat exchanger 26 on the refrigerant side are equipped with a first electronic expansion valve 20. The first electronic expansion valve 20 is used to regulate the flow rate, control the superheat, and reduce the pressure on the refrigerant side of the waste heat enthalpy-increasing plate heat exchanger.

[0026] Furthermore, the battery cooling piping system also includes a second expansion tank 35, which is connected to the inlet of the second water pump 31 via a branch pipe. The second expansion tank 35 provides pressure stabilization and water replenishment for the battery cooling piping system.

[0027] Both the inlet end of the first battery water-cooled plate heat exchanger 33 on the refrigerant side and the inlet end of the second battery water-cooled plate heat exchanger 34 on the refrigerant side are equipped with a second electronic expansion valve 36. The second battery water-cooled plate heat exchanger 34 is used to regulate the flow rate, control the superheat, and reduce the pressure on the refrigerant side of the battery water-cooled plate heat exchanger.

[0028] Specifically, it also includes a control module, which can detect the water flow temperature of the electric drive cooling pipe system and the battery cooling pipe system, the room temperature of the vehicle compartment, etc., and control the operation of the front air conditioning unit, the rear air conditioning unit, the electric drive cooling pipe system and the battery cooling pipe system.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An integrated dual-air conditioning thermal management system for electric buses, characterized in that, This includes the electric drive cooling system, battery cooling system, front air conditioning unit, and rear air conditioning unit; Both the front air conditioning unit and the rear air conditioning unit have a compressor, a reversing valve, an outdoor heat exchanger, and an indoor heat exchanger. The battery cooling piping system is connected to a second water pump, a battery box cooling module, a first battery water-cooled heat exchanger, and a second battery water-cooled heat exchanger via pipelines. The first battery water-cooled heat exchanger and the second battery water-cooled heat exchanger are connected in parallel. One end of the refrigerant side of the first battery water-cooled heat exchanger is connected to the reversing valve of the front air conditioning unit, and the other end is connected to the pipeline between the outdoor heat exchanger and the indoor heat exchanger of the front air conditioning unit. One end of the refrigerant side of the second battery water-cooled heat exchanger is connected to the reversing valve of the rear air conditioning unit, and the other end is connected to the pipeline between the outdoor heat exchanger and the indoor heat exchanger of the rear air conditioning unit. The electric drive cooling pipe system is connected by pipes to a first water pump, an electric drive cooling module, a first electric drive radiator, a second electric drive radiator, a first waste heat enthalpy-increasing plate heat exchanger, a second waste heat enthalpy-increasing plate heat exchanger, and a solenoid valve assembly. The solenoid valve assembly can control the electric drive cooling pipe system to switch between a first state and a second state. In the first state, the electric drive cooling pipe system is connected to the first water pump, the electric drive cooling module, the first electric drive radiator and the second electric drive radiator, and the first electric drive radiator and the second electric drive radiator are connected in parallel. The first electric drive radiator can dissipate heat through the fan of the outdoor heat exchanger of the front air conditioning unit, and the second electric drive radiator can dissipate heat through the fan of the outdoor heat exchanger of the rear air conditioning unit. In the second state, the electric drive cooling pipe system is connected to the first water pump, the electric drive cooling module, the first waste heat enthalpy-increasing plate heat exchanger, and the second waste heat enthalpy-increasing plate heat exchanger. The first waste heat enthalpy-increasing plate heat exchanger and the second waste heat enthalpy-increasing plate heat exchanger are connected in parallel. The refrigerant side of the first waste heat enthalpy-increasing plate heat exchanger is connected in parallel with the outdoor heat exchanger of the front air conditioning unit, and the refrigerant side of the second waste heat enthalpy-increasing plate heat exchanger is connected in parallel with the outdoor heat exchanger of the rear air conditioning unit.

2. The integrated dual-air conditioning thermal management system for electric buses according to claim 1, characterized in that... The battery valve assembly includes two first solenoid valves and two second solenoid valves. The two first solenoid valves are respectively located at the inlet ends of the first electric drive heat sink and the second electric drive heat sink, and the two second solenoid valves are respectively located at the inlet ends of the first waste heat enthalpy plate heat exchanger and the second waste heat enthalpy plate heat exchanger.

3. The integrated dual-air conditioning thermal management system for electric buses according to claim 1, characterized in that... The electric drive cooling piping system also includes a first expansion tank, which is connected to the inlet end of the first water pump via a branch pipeline.

4. The integrated dual-air conditioning thermal management system for electric buses according to claim 1, characterized in that... Both the inlet end of the first waste heat enthalpy-increasing plate refrigerant side and the inlet end of the second waste heat enthalpy-increasing plate refrigerant side are equipped with a first electronic expansion valve.

5. The integrated dual-air conditioning thermal management system for electric buses according to claim 1, characterized in that... The battery cooling piping system also includes a second expansion tank, which is connected to the inlet of the second water pump via a branch pipe.

6. The integrated dual-air conditioning thermal management system for electric buses according to claim 1, characterized in that... Both the inlet end of the first battery water-cooled plate on the refrigerant side and the inlet end of the second battery water-cooled plate on the refrigerant side are equipped with a second electronic expansion valve.

7. The integrated dual-air conditioning thermal management system for electric buses according to claim 1, characterized in that... It also includes a control module, which is used to detect the system temperature and control the operation of the system.

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