A new energy vehicle air conditioning unit, battery heat dissipation method

Abstract

A new energy vehicle air conditioning unit and battery heat dissipation method according to the present invention includes a heat pump system composed of a compressor, a condenser, an evaporator, and a throttling device, and further includes a battery radiator. The battery radiator is connected to a water pump to form a battery heat dissipation water loop for heat exchange with the battery; the battery radiator is arranged at the condenser and shares a condensation fan with the condenser. By arranging the battery radiator at the condenser and borrowing the condensation fan of the air conditioner, when the battery requires less cooling capacity, the condensation fan is preferentially turned on, and the battery is cooled by external air convection, avoiding frequent startup of the compressor and improving the energy efficiency ratio of the whole machine. The heat absorbed from the battery heat dissipation plate is transported to the passenger compartment through the compressor and the evaporator, raising the temperature in the passenger compartment, completing preheating, and at the same time saving a large amount of energy and avoiding waste.

Description

Technical Field

[0001] The present invention relates to an air conditioner unit for a vehicle, and particularly to an air conditioner unit for a new energy vehicle. Background Art

[0002] The existing integrated vehicle air conditioner units mainly have the following deficiencies:

[0003] The current integrated air conditioners on the market can only achieve simultaneous operation of cabin refrigeration and battery liquid cooling, and cannot achieve simultaneous battery cooling while the cabin is heated by a heat pump. If the cabin heating is achieved by turning on the PTC, it will lead to an increase in the overall vehicle power consumption.

[0004] Most of the current electric air conditioner defrosting on the market uses PTC to defrost and demist the glass. It consumes a large amount of power and is not energy-efficient. Some use an independent fuel pump to provide heat for defrosting and demisting.

[0005] In the spring and autumn seasons, for the current integrated air conditioners on the market, the battery needs to be cooled while the cabin does not need refrigeration or heating. At this time, the battery liquid cooling needs to turn on the compressor. At this time, the battery requires less cooling capacity, and the compressor will start frequently and each compressor operation time is shorter. After working in this state for a long time, the compressor will be damaged and its life will be affected.

[0006] Most of the operating electric buses are charged at night and operate on the road during the day. When charging at night, the battery will

[0007] emit more heat. For the existing heating solutions, the heat is directly discharged to the outside through the air conditioner, resulting in waste of resources. Summary of the Invention

[0008] The main object of the present invention is to solve the technical problems in the existing technology and provide a new energy vehicle air conditioner unit that improves resource utilization.

[0009] Another main object of the present invention is to provide a battery heat dissipation method using the above air conditioner unit.

[0010] To achieve the above object, the technical solution of the present invention is:

[0011] A new energy vehicle air conditioner unit includes a heat pump system composed of a compressor, a condenser, an evaporator, and a throttling device, and further includes a battery radiator. The battery radiator is connected to a water pump to form a battery heat dissipation water loop for heat exchange with the battery;

[0012] The battery radiator is disposed at the condenser and shares a condenser fan with the condenser.

[0013] Further, it further includes a battery cooling plate heat exchanger. The water inlet and outlet of the battery cooling plate heat exchanger are connected in series in the battery cooling water loop. The gas outlet and inlet of the battery cooling plate heat exchanger are respectively connected to the intake end of the compressor and the fourth electronic expansion valve, and the other end of the fourth electronic expansion valve is connected to the condenser.

[0014] Further, a branch water pipe is connected in parallel between the water inlet and the water outlet of the battery radiator. A first solenoid valve is provided at the water inlet of the battery radiator, and a second solenoid valve is provided on the branch water pipe.

[0015] Further, it further includes a water tank, and the water outlet of the water tank is connected to the battery cooling water loop.

[0016] Further, the condenser includes a first condenser and a second condenser. One end of the first condenser is connected to the four-way valve, and the other end is connected to the first electronic expansion valve. One end of the second condenser is connected to the four-way valve, and the other end is connected to the inlet of the first one-way valve. The first condenser and the second condenser are connected and communicated by a refrigerant channel on one side of the one-way valve.

[0017] Further, the evaporator includes a first passenger compartment evaporator, a second passenger compartment evaporator, and a driver's cab evaporator. One end of the first passenger compartment evaporator is connected to the four-way valve, and the other end is connected to the second electronic expansion valve. The other end of the second electronic expansion valve is connected to the outlets of the first electronic expansion valve and the first one-way valve;

[0018] One end of the second passenger compartment evaporator is connected to the four-way valve, and the other end is connected to the inlet of the second one-way valve. The outlet of the second one-way valve is connected to the outlets of the first electronic expansion valve and the first one-way valve;

[0019] One end of the driver's cab evaporator is connected to the four-way valve, and the other end is respectively connected to the inlet of the third electronic expansion valve and the third one-way valve. The other end of the third electronic expansion valve is connected to the outlets of the first electronic expansion valve and the first one-way valve, and the outlet of the third one-way valve is connected to the outlets of the first electronic expansion valve and the first one-way valve.

[0020] Further, the fourth electronic expansion valve is connected to the outlets of the first electronic expansion valve and the first one-way valve.

[0021] Another technical solution of the present invention is:

[0022] A battery cooling method for an air conditioning unit of a new energy vehicle applying the above. When the heat generation of the battery is low, the condensation fan is turned on to cool the water in the battery cooling water loop, and the battery cooling water loop exchanges heat with the battery to cool the battery;

[0023] When the heat generated by the battery is high, the compressor is turned on. After the refrigerant flows into the evaporator, it enters the battery heat dissipation plate heat exchanger to cool the water in the battery heat dissipation water loop, and the battery heat dissipation water loop exchanges heat with the battery to dissipate heat from the battery.

[0024] Another technical solution of the present invention is:

[0025] A battery heat dissipation method for a new energy vehicle air conditioning unit applying the above, the compressor is turned on, and after the refrigerant flows into the condenser, it enters the battery heat dissipation plate heat exchanger to cool the water in the battery heat dissipation water loop, and the battery heat dissipation water loop exchanges heat with the battery to dissipate heat from the battery.

[0026] Another technical solution of the present invention is:

[0027] A battery heat dissipation method for a new energy vehicle air conditioning unit applying the above, the compressor is turned on, a part of the refrigerant flows into the condenser and then enters the battery heat dissipation plate heat exchanger to cool the water in the battery heat dissipation water loop, and the battery heat dissipation water loop exchanges heat with the battery to dissipate heat from the battery;

[0028] Another part of the refrigerant flows into the evaporator to cool the interior of the vehicle.

[0029] In summary, for a new energy vehicle air conditioning unit and a battery heat dissipation method of the present invention, by arranging the battery radiator at the condenser and borrowing the condensation fan of the air conditioner, when the battery requires less cooling capacity, the condensation fan is preferentially turned on, and the battery is cooled by external air convection, avoiding frequent startup of the compressor and also improving the energy efficiency ratio of the whole machine. The heat absorbed from the battery heat dissipation plate heat exchanger is transported to the interior of the vehicle through the compressor and the evaporator, raising the temperature inside the vehicle, completing preheating, and at the same time saving a large amount of energy and avoiding waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the refrigerant flow diagram of Embodiment 1 of the present invention;

[0031] Figure 2 is the refrigerant flow diagram of Embodiment 2 of the present invention;

[0032] Figure 3 is the refrigerant flow diagram of Embodiment 3 of the present invention.

[0033] Such as Figures 1 to 3As shown in the figure, there are a compressor 1, a battery radiator 2, a water pump 3, a battery 4, a battery heat exchange plate type heat exchanger 5, a first solenoid valve 6, a second solenoid valve 7, a water tank 8, a first condenser 91, a second condenser 92, a four-way valve 10, a first passenger compartment evaporator 111, a second passenger compartment evaporator 112, a driver's cab evaporator 113, a first electronic expansion valve 121, a second electronic expansion valve 122, a third electronic expansion valve 123, a fourth electronic expansion valve 124, a first check valve 131, a second check valve 132, a third check valve 133, and a condensing fan 14. Detailed implementation mode

[0034] The present invention will be further described in detail below in conjunction with the drawings and the specific implementation mode:

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] Embodiment 1

[0037] As Figure 1 shown, a new energy vehicle air conditioning unit includes a heat pump system composed of a compressor 1, a condenser, an evaporator, and a throttling device. It also includes a battery radiator 2, and the battery radiator 2 is connected to a water pump 3 to form a battery heat dissipation water loop for heat exchange with the battery 4. The battery radiator 2 is arranged at the condenser and shares a condensing fan with the condenser.

[0038] It also includes a battery heat exchange plate type heat exchanger 5. The water inlet and outlet of the battery heat exchange plate type heat exchanger 5 are connected in series in the battery heat dissipation water loop. The gas outlet and inlet of the battery heat exchange plate type heat exchanger 5 are respectively connected to the intake end of the compressor 1 and the fourth electronic expansion valve 124, and the other end of the fourth electronic expansion valve 124 is connected to the condenser.

[0039] A branch water pipe is connected in parallel between the water inlet and the water outlet of the water circuit of the battery radiator 2. A first solenoid valve 6 is arranged at the water inlet of the battery radiator 2, and a second solenoid valve 7 is arranged on the branch water pipe.

[0040] It also includes a water tank 8, and the water outlet of the water tank 8 is connected to the battery heat dissipation water loop.

[0041] The condenser includes a first condenser 91 and a second condenser 92. One end of the first condenser 91 is connected to the four-way valve 10, and the other end is connected to the first electronic expansion valve 121. One end of the second condenser 92 is connected to the four-way valve 10, and the other end is connected to the inlet of the first check valve 131. The first condenser 91 and the second condenser 92 are connected and communicated by a refrigerant channel on one side of the check valve.

[0042] The evaporator includes a first passenger compartment evaporator 111, a second passenger compartment evaporator 112, and a driver's cab evaporator 113.

[0043] One end of the first passenger compartment evaporator 111 is connected to the four-way valve 10, and the other end is connected to the second electronic expansion valve 122. The other end of the second electronic expansion valve 122 is connected to the outlets of the first electronic expansion valve 121 and the first check valve 131.

[0044] One end of the second passenger compartment evaporator 112 is connected to the four-way valve 10, and the other end is connected to the inlet of the second check valve 132. The outlet of the second check valve 132 is connected to the outlets of the first electronic expansion valve 121 and the first check valve 131.

[0045] One end of the driver's cab evaporator 113 is connected to the four-way valve 10, and the other end is respectively connected to the inlets of the third electronic expansion valve 123 and the third check valve 133. The other end of the third electronic expansion valve 123 is connected to the outlets of the first electronic expansion valve 121 and the first check valve 131. The outlet of the third check valve 133 is connected to the outlets of the first electronic expansion valve 121 and the first check valve 131.

[0046] The fourth electronic expansion valve 124 is connected to the outlets of the first electronic expansion valve 121 and the first check valve 131.

[0047] Through the above structural composition of a new energy vehicle air conditioning unit, this unit can achieve the separate operation of the passenger compartment air conditioner in the cooling or heating mode, the separate operation of the driver's cab air conditioner in the heating or heating mode, the simultaneous operation of the passenger compartment air conditioner and the driver's cab air conditioner in the heating or heating mode, and the defrosting mode.

[0048] The battery heat dissipation method of this embodiment is applied to the heat dissipation method of the battery during winter battery charging.

[0049] A battery heat dissipation method using the above new energy vehicle air conditioning unit. When the heat generation of the battery is low, the first solenoid valve 6 in the battery heat dissipation water loop is opened, the second solenoid valve 7 is closed, and the condensation fan 14 is turned on to cool the water in the battery heat dissipation water loop. The battery heat dissipation water loop exchanges heat with the battery 4 to dissipate heat from the battery.

[0050] When the heat generation of the battery is high, the compressor 1 is turned on, and the refrigerant flows into the first passenger compartment evaporator 111, the second passenger compartment evaporator 112, and the driver's cab evaporator 113. At this time, the evaporator plays a condensing role, and the refrigerant becomes a liquid after cooling. The liquid refrigerant passes through the second one-way valve 132 and the third one-way valve 133 and enters the fourth electronic expansion valve 124 for throttling, and then enters the battery heat dissipation plate heat exchanger 5. The refrigerant gasifies into a gas and returns to the gas-liquid separator, and then returns to the intake of the compressor 1 to complete a refrigeration cycle. The refrigerant cools the water in the battery heat dissipation water loop, and the battery heat dissipation water loop exchanges heat with the battery 4 to dissipate heat from the battery. At this time, the first one-way valve 131 is not conducting, and the first electronic expansion valve 121, the second electronic expansion valve 122, and the third electronic expansion valve 123 are all in the closed state. The second solenoid valve 7 in the battery heat dissipation water loop is opened, and the first solenoid valve 6 is closed.

[0051] In the present invention, the battery radiator is arranged at the condenser, and the condensing fan 14 of the air conditioner is borrowed. When the battery 4 requires less cooling capacity, the condensing fan 14 is preferentially turned on, and the battery is cooled by the external air convection, avoiding frequent startup of the compressor 1 and also improving the energy efficiency ratio of the whole machine. The heat absorbed from the battery heat dissipation plate heat exchanger 5 is transported to the carriage through the compressor 1 and the evaporator, raising the temperature in the carriage, completing the preheating, and at the same time saving a large amount of energy and avoiding waste.

[0052] Embodiment 2

[0053] The air conditioner unit structure of this embodiment is the same as that of Embodiment 1 and will not be described in detail here.

[0054] As Figure 2 shown, the battery heat dissipation method of this embodiment is applied to the heat dissipation method of the battery during summer battery charging.

[0055] A battery heat dissipation method for a new energy vehicle air conditioner unit using the above, the compressor 1 is turned on, the refrigerant flows into the first condenser 91 and the second condenser 92, and the refrigerant cooled into a liquid then flows into the fourth electronic expansion valve 124 through the first one-way valve 131 for throttling, and then enters the battery heat dissipation plate heat exchanger 5. The refrigerant gasifies into a gas and returns to the gas-liquid separator, and then returns to the intake of the compressor 1 to complete a refrigeration cycle. The refrigerant cools the water in the battery heat dissipation water loop, and the battery heat dissipation water loop exchanges heat with the battery 4 to dissipate heat from the battery. At this time, the second one-way valve 132 and the third one-way valve 133 are not conducting, and the first electronic expansion valve 121, the second electronic expansion valve 122, and the third electronic expansion valve 123 are all in the closed state.

[0056] Judge the condenser temperature value. When the condensation temperature is relatively low, the battery radiator 2 is preferentially used to cool the battery 4. At this time, the first solenoid valve 6 in the battery cooling water loop is opened, the second solenoid valve 7 is closed, the compressor 1 stops running, and the condensation fan 14 is turned on. When it is detected that the condensation temperature is relatively high, the cooling of the battery radiator 2 needs to be turned off to prevent the condensation air from heating the water in the battery cooling water loop. At this time, the second solenoid valve 7 in the water circuit is opened, and the first solenoid valve 6 is closed. The compressor 1 is turned on to cool the battery 4.

[0057] Embodiment III

[0058] The air-conditioning unit structure of this embodiment is the same as that of Embodiment I and will not be elaborated here.

[0059] As Figure 3 shown, this embodiment is a method for cooling the battery when the passenger compartment and the driver's cab are cooled in summer.

[0060] A method for cooling the battery of a new energy vehicle air-conditioning unit applying the above-mentioned technology. The compressor 1 is turned on, and the refrigerant flows into the first condenser 91 and the second condenser 92. After the refrigerant is cooled into a liquid, it is divided into two parts through the first one-way valve 131. One part of the refrigerant flows into the first passenger compartment evaporator 111, the second passenger compartment evaporator 112, and the driver's cab evaporator 113 after throttling through the second electronic expansion valve 122 and the third electronic expansion valve 123, and exchanges heat to supply cold air to the passenger compartment and the driver's cab after heat exchange. The other part of the refrigerant flows into the battery cooling plate heat exchanger 5 after throttling through the fourth electronic expansion valve 124 to cool the water in the battery cooling water loop, and the battery cooling water loop exchanges heat with the battery 4 to cool the battery. At this time, the first one-way valve 131 is conducting, the second one-way valve 132 and the third one-way valve 133 are not conducting, and the first electronic expansion valve 121 is closed.

[0061] Embodiment IV

[0062] The defrosting mode described in the present invention is specifically as follows:

[0063] A PTC electric heating device is integrally provided at the driver's cab evaporator 113. When the vehicle is just started, when it is determined that the outdoor temperature is less than a certain value, the PTC electric heating device is preferentially used for rapid defrosting and defogging. When the temperature is relatively high, heat pump heating is used for defrosting and defogging. It is more energy-efficient compared to PTC heating and fuel heater defrosting.

[0064] As described above, combining the solution content given in the accompanying drawings, similar technical solutions can be derived. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A new energy vehicle air conditioning unit, comprising a heat pump system composed of a compressor, a condenser, an evaporator, and a throttling device, Characterized in that: It further includes a battery radiator, and the battery radiator is connected to a water pump to form a battery cooling water loop for heat exchange with the battery; The battery radiator is arranged at the condenser and shares a condenser fan with the condenser; It further includes a battery cooling plate heat exchanger. The water inlet and outlet of the battery cooling plate heat exchanger are connected in series in the battery cooling water loop. The gas outlet and inlet of the battery cooling plate heat exchanger are respectively connected to the intake end of the compressor and the fourth electronic expansion valve, and the other end of the fourth electronic expansion valve is connected to the condenser; The condenser includes a first condenser and a second condenser. One end of the first condenser is connected to the four-way valve, and the other end is connected to the first electronic expansion valve. One end of the second condenser is connected to the four-way valve, and the other end is connected to the inlet of the first check valve. The first condenser and the second condenser are connected and communicated by a refrigerant channel on one side of the check valve; The evaporator includes a first passenger compartment evaporator, a second passenger compartment evaporator, and a driver's cab evaporator. One end of the first passenger compartment evaporator is connected to the four-way valve, and the other end is connected to the second electronic expansion valve. The other end of the second electronic expansion valve is connected to the outlets of the first electronic expansion valve and the first check valve; One end of the second passenger compartment evaporator is connected to the four-way valve, and the other end is connected to the inlet of the second check valve. The outlet of the second check valve is connected to the outlets of the first electronic expansion valve and the first check valve; One end of the driver's cab evaporator is connected to the four-way valve, and the other end is respectively connected to the inlet of the third electronic expansion valve and the third check valve. The other end of the third electronic expansion valve is connected to the outlets of the first electronic expansion valve and the first check valve, and the outlet of the third check valve is connected to the outlets of the first electronic expansion valve and the first check valve.

2. A new energy vehicle air conditioning unit according to claim 1, Characterized in that: A branch water pipe is connected in parallel between the water inlet and the water outlet of the battery radiator. A first solenoid valve is arranged at the water inlet of the battery radiator, and a second solenoid valve is arranged on the branch water pipe.

3. A new energy vehicle air conditioning unit according to claim 1, Characterized in that: It further includes a water tank, and the water outlet of the water tank is connected to the battery cooling water loop.

4. A new energy vehicle air conditioning unit according to claim 1, Characterized in that: The fourth electronic expansion valve is connected to the outlets of the first electronic expansion valve and the first check valve.

5. A battery cooling method for applying the new energy vehicle air conditioning unit according to any one of claims 1 to 4, Characterized in that: When the battery heat generation is low, the condenser fan is turned on to cool the water in the battery cooling water loop, and the battery cooling water loop exchanges heat with the battery to cool the battery; When the battery heat generation is high, the compressor is turned on, and the refrigerant flows into the evaporator and then enters the battery cooling plate heat exchanger to cool the water in the battery cooling water loop, and the battery cooling water loop exchanges heat with the battery to cool the battery.

6. A battery heat dissipation method for a new energy vehicle air conditioning unit as described in any one of claims 1 to 4, characterized in that: The compressor is turned on, and the refrigerant flows into the condenser and then enters the battery heat dissipation plate heat exchanger to cool the water in the battery heat dissipation water loop, and the battery heat dissipation water loop exchanges heat with the battery to dissipate heat for the battery.

7. A battery heat dissipation method for a new energy vehicle air conditioning unit as described in any one of claims 1 to 4, characterized in that: The compressor is turned on, and a part of the refrigerant flows into the condenser and then enters the battery heat dissipation plate heat exchanger to cool the water in the battery heat dissipation water loop, and the battery heat dissipation water loop exchanges heat with the battery to dissipate heat for the battery; Another part of the refrigerant flows into the evaporator to cool the interior of the vehicle.

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