Battery heat exchange system

Abstract

This invention provides a battery heat exchange system, including a refrigerant circulation loop, an antifreeze circulation loop, and a four-way valve. The antifreeze circulation loop includes a radiator and a battery heat exchange plate, the battery heat exchange plate being used to contact the battery. The refrigerant circulation loop includes a compressor, a condenser, and an evaporator. The four-way valve is connected to the battery heat exchange plate, the evaporator, the condenser, and the radiator respectively. The four-way valve can be switched to a first mode or a second mode. In the first mode, the compressor runs, and the liquid output from the battery heat exchange plate is cooled by the evaporator and flows back to the battery heat exchange plate. In the second mode, the compressor does not run, and the liquid output from the battery heat exchange plate is cooled by the radiator and flows back to the battery heat exchange plate. This avoids the situation where the compressor must run continuously for heat exchange, reducing the compressor's running time and thus reducing system energy consumption, achieving energy saving. Furthermore, the four-way valve enables mode switching, simplifying the system piping layout and making it easy to control, saving costs.

Description

Technical Field

[0001] This utility model relates to the field of battery thermal management technology, and more specifically, to a battery heat exchange system. Background Technology

[0002] The power battery in new energy vehicles is a crucial component, requiring a suitable temperature to function properly. Existing vehicles typically incorporate a battery heat exchange system to regulate battery temperature. This system generally utilizes a compressor to condense gaseous refrigerant into a liquid within the condenser. After throttling and depressurization, the liquid enters the evaporator. The refrigerant evaporates in the evaporator, absorbing heat from the antifreeze flowing across the other side. The cooled antifreeze is then transported to the battery heat exchange plate, thereby cooling the battery.

[0003] This type of heat exchange method requires a compressor to cool the battery even during the low ambient temperatures of spring and autumn, resulting in high energy consumption. Therefore, it is necessary to optimize the existing battery heat exchange system to reduce system energy consumption. Utility Model Content

[0004] This invention provides a battery heat exchange system to solve the problem of high energy consumption in existing battery heat exchange systems.

[0005] To address the aforementioned problems, this utility model provides a battery heat exchange system, including a refrigerant circulation loop, an antifreeze circulation loop, and a four-way valve. The antifreeze circulation loop includes a radiator and a battery heat exchange plate, with the battery heat exchange plate designed to fit against the battery. The refrigerant circulation loop includes a compressor, a condenser, and an evaporator. The four ports of the four-way valve are respectively connected to the battery heat exchange plate, the evaporator, the condenser, and the radiator. The four-way valve can be switched to a first mode or a second mode. In the first mode, the compressor operates, and the liquid output from the battery heat exchange plate is cooled by the evaporator and flows back to the battery heat exchange plate, thus cooling the battery. The liquid output from the condenser is cooled by the radiator and flows back to the condenser. In the second mode, the compressor does not operate, and the liquid output from the battery heat exchange plate is cooled by the radiator and flows back to the battery heat exchange plate, thus cooling the battery.

[0006] Furthermore, the four-way valve also has a third mode, in which the compressor operates, the liquid output from the battery heat exchange plate is heated by the condenser and flows back to the battery heat exchange plate.

[0007] Furthermore, the four-way valve has a first valve port, a second valve port, a third valve port, and a fourth valve port. The battery heat exchange system also includes an outlet pipe, a return pipe, an evaporation heat exchange pipe, a liquid cooling pipe, and a condensation heat exchange pipe. The outlet pipe is connected to the outlet of the battery heat exchange plate and the first valve port at both ends, respectively. The return pipe is connected to the inlet of the battery heat exchange plate. The evaporation heat exchange pipe is connected to the evaporator for heat exchange, and its two ends are connected to the second valve port and the return pipe at both ends, respectively. The liquid cooling pipe is connected to the radiator for heat exchange, with one end connected to the fourth valve port and the other end connectable to the return pipe. The condensation heat exchange pipe is connected to the condenser for heat exchange, and its two ends are connected to the third valve port and the liquid cooling pipe at both ends, respectively. In the first mode, the first and second valve ports are connected, the third and fourth valve ports are connected, and the liquid cooling pipe and the return pipe are disconnected. In the second mode, the first and fourth valve ports are connected, the third and fourth valve ports are closed, and the liquid cooling pipe and the return pipe are connected.

[0008] Furthermore, the four-way valve also has a third mode. In the third mode, the compressor is running, the first and third valve ports are connected, the second and fourth valve ports are closed, and the condenser heat exchange tube and the return liquid tube are connected.

[0009] Furthermore, the refrigerant circulation loop also includes a first pipe, a second pipe, a first branch pipe, a second branch pipe, and a third pipe. The two ends of the first pipe are connected to the compressor outlet and the condenser inlet, respectively. One end of the second pipe is connected to the condenser outlet. One end of the first branch pipe is connected to the other end of the second pipe. The other end of the first branch pipe is flexibly connected to the evaporator inlet. One end of the second branch pipe is connected to the other end of the second pipe. The other end of the second branch pipe is flexibly connected to the compressor inlet. The two ends of the third pipe are connected to the evaporator outlet and the compressor inlet, respectively. In the first mode, the other end of the first branch pipe is connected to the evaporator inlet, and the other end of the second branch pipe is disconnected from the compressor inlet. In the third mode, the other end of the first branch pipe is disconnected from the evaporator inlet, and the other end of the second branch pipe is connected to the compressor inlet.

[0010] Furthermore, the refrigerant circulation loop also includes a shut-off valve, a thermostatic expansion valve, and an electronic expansion valve. The shut-off valve and the thermostatic expansion valve are both installed on the first branch pipe, and the electronic expansion valve is installed on the second branch pipe.

[0011] Furthermore, the refrigerant circulation loop also includes an electromagnetic thermostatic expansion valve and an electronic expansion valve, with the electromagnetic thermostatic expansion valve installed on the first branch pipe and the electronic expansion valve installed on the second branch pipe.

[0012] Furthermore, the battery heat exchange system also includes an outlet temperature sensor, a return temperature sensor, an ambient temperature sensor, and a controller. The outlet temperature sensor is installed on the outlet pipe, the return temperature sensor is installed on the return pipe, and the ambient temperature sensor is used to detect the temperature of the natural environment. The outlet temperature sensor, the return temperature sensor, the ambient temperature sensor, the four-way valve, and the compressor are all electrically connected to the controller.

[0013] Furthermore, the battery heat exchange system also includes a first water pump and a second water pump, with the first water pump installed on the liquid outlet pipe and the second water pump installed on the liquid cooling pipe.

[0014] Furthermore, the radiator is positioned on the windward side of the vehicle's front end to dissipate heat through the flowing natural wind.

[0015] Furthermore, the battery heat exchange system also includes a fan that dissipates heat from the radiator, which is located between the air intake grille at the front of the vehicle and the fan.

[0016] Furthermore, the battery heat exchange system also includes an electric heater, which is used to heat the liquid output from the battery heat exchange plate. When the electric heater is running, the compressor does not run.

[0017] In this solution, the battery heat exchange system includes a refrigerant circulation loop, a radiator, and a four-way valve. The operating mode of the battery heat exchange system can be adjusted by switching the four-way valve. In the first mode, the compressor runs, and the liquid output from the battery heat exchange plate is cooled by the evaporator and flows back to the battery heat exchange plate. In the second mode, the compressor does not run, and the liquid output from the battery heat exchange plate is cooled by the radiator and flows back to the battery heat exchange plate. For example, when the ambient temperature is high or the battery cooling load is high, the compressor runs, cooling the battery through refrigerant heat exchange. When the ambient temperature is low, the compressor does not run, and the battery is cooled directly through natural airflow and radiator heat exchange. In other words, this solution allows for the selection of different operating modes based on ambient temperature and other conditions when the battery needs cooling at high temperatures, avoiding the need for the compressor to run continuously for heat exchange, reducing compressor operating time, and thus lowering system energy consumption, achieving energy saving. Moreover, the mode switching achieved through the four-way valve simplifies the system piping layout, makes it easy to control, and saves costs. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the battery heat exchange system provided in Embodiment 1 of this utility model is shown;

[0020] Figure 2 A schematic diagram of the battery heat exchange system provided in Embodiment 2 of this utility model is shown;

[0021] Figure 3 A schematic diagram of the battery heat exchange system provided in Embodiment 3 of this utility model is shown;

[0022] Figure 4 A schematic diagram of the battery heat exchange system provided in Embodiment 4 of this utility model is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Radiator; 20. Four-way valve; 21. First valve port; 22. Second valve port; 23. Third valve port; 24. Fourth valve port; 31. Compressor; 32. Condenser; 33. Evaporator; 34. First pipeline; 35. Second pipeline; 36. First branch pipe; 37. Second branch pipe; 38. Third pipeline; 41. Liquid outlet pipe; 42. Liquid return pipe; 43. Evaporation heat exchanger tube; 44. Liquid cooling pipe; 45. Condensation heat exchanger tube; 51. Shut-off valve; 52. Thermal expansion valve; 53. Electronic expansion valve; 54. Electromagnetic thermal expansion valve; 61. Liquid outlet temperature sensor; 62. Liquid return temperature sensor; 71. First water pump; 72. Second water pump; 80. Fan; 90. Electric heater. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] like Figure 1As shown, Embodiment 1 of this utility model provides a battery heat exchange system, including a refrigerant circulation loop, an antifreeze circulation loop, and a four-way valve 20. The antifreeze circulation loop includes a radiator 10 and a battery heat exchange plate, which is used to contact the battery. The refrigerant circulation loop includes a compressor 31, a condenser 32, and an evaporator 33. The four ports of the four-way valve 20 are respectively connected to the battery heat exchange plate, the evaporator 33, the condenser 32, and the radiator 10. The four-way valve 20 can be switched to a first mode or a second mode. In the first mode, the compressor 31 is running, and the liquid output from the battery heat exchange plate is cooled by the evaporator 33 and flows back to the battery heat exchange plate to cool the battery. The liquid output from the condenser 32 is cooled by the radiator 10 and flows back to the condenser 32. In the second mode, the compressor 31 is not running, and the liquid output from the battery heat exchange plate is cooled by the radiator 10 and flows back to the battery heat exchange plate to cool the battery.

[0027] In Embodiment 1 of this solution, the battery heat exchange system includes a refrigerant circulation loop, a radiator 10, and a four-way valve 20. The operating mode of the battery heat exchange system can be adjusted by switching the mode of the four-way valve 20. In the first mode, the compressor 31 operates, the liquid output from the battery heat exchange plate is cooled by the evaporator 33 and flows back to the battery heat exchange plate, and the liquid output from the condenser 32 is cooled by the radiator 10 and flows back to the condenser 32. In the second mode, the compressor 31 does not operate, and the liquid output from the battery heat exchange plate is cooled by the radiator 10 and flows back to the battery heat exchange plate. For example, when the ambient temperature is high or the battery cooling load is large, the compressor 31 operates to cool the battery through refrigerant heat exchange. When the ambient temperature is low, the compressor 31 does not operate, and the battery is cooled directly by natural air and heat exchange through the radiator 10. This solution allows for the selection of different operating modes based on ambient temperature and other factors when the battery needs cooling at high temperatures. This avoids the need for the compressor 31 to run continuously for heat exchange, reducing its operating time and thus lowering system energy consumption, achieving energy savings. Furthermore, the mode switching is achieved through the operation of the four-way valve 20, simplifying the system piping layout, making it easier to control, and saving costs.

[0028] Optionally, the radiator 10 dissipates heat through air cooling, and can dissipate heat from the liquid output from the battery heat exchange plate or the liquid output from the condenser 32 by blowing air or natural ventilation.

[0029] In Embodiments 2 and 3 provided by this utility model, as Figure 2 and Figure 3 As shown, the four-way valve 20 also has a third mode, in which the compressor 31 operates, and the liquid output from the battery heat exchange plate is heated by the condenser 32 and flows back to the battery heat exchange plate.

[0030] For example, in cold environments, excessively low battery temperatures can lead to reduced battery performance, decreased charging and discharging efficiency, and even potential safety issues. In this case, the third mode activates the compressor 31 and heats the liquid via the condenser 32, raising the liquid temperature and causing it to flow back to the battery heat exchange plate. This increases the battery temperature and prevents excessively low temperatures from affecting normal battery operation. Furthermore, the addition of this third mode allows the solution to adapt to a wider range of operating environments. Whether cooling the battery under high temperatures or heating it under low temperatures, the solution can switch modes according to the actual situation, ensuring reliable operation in various climatic conditions.

[0031] like Figure 1 As shown, the four-way valve 20 has a first valve port 21, a second valve port 22, a third valve port 23, and a fourth valve port 24. The battery heat exchange system also includes an outlet pipe 41, a return pipe 42, an evaporation heat exchange pipe 43, a liquid cooling pipe 44, and a condensation heat exchange pipe 45. The outlet pipe 41 is connected to the outlet of the battery heat exchange plate and the first valve port 21 at both ends, respectively. The return pipe 42 is connected to the inlet of the battery heat exchange plate. The evaporation heat exchange pipe 43 is heat-exchange coupled with the evaporator 33, and its two ends are connected to the second valve port 22 and the return pipe 42 at both ends, respectively. The liquid cooling pipe 44 is heat-exchange coupled with the radiator 10. One end of the liquid cooling pipe 44 is connected to the fourth valve port 24, and the other end of the liquid cooling pipe 44 is flexibly connected to the return pipe 42. The condensing heat exchange pipe 45 is heat exchanged with the condenser 32, and both ends of the condensing heat exchange pipe 45 are connected to the third valve port 23 and the liquid cooling pipe 44, respectively. In the first mode, the first valve port 21 and the second valve port 22 are connected, the third valve port 23 and the fourth valve port 24 are connected, and the liquid cooling pipe 44 and the return pipe 42 are disconnected. In the second mode, the first valve port 21 and the fourth valve port 24 are connected, the third valve port 23 and the fourth valve port 24 are closed, and the liquid cooling pipe 44 and the return pipe 42 are connected.

[0032] In the first embodiment of this solution, in the first mode, the gaseous refrigerant in the compressor 31 is forced into the condenser 32, where it releases heat and becomes liquid refrigerant, which is then transported back to the evaporator 33. In this case, the first valve port 21 and the second valve port 22 are connected, and the liquid output from the battery heat exchange plate exchanges heat with the evaporator 33 through the evaporation heat exchange tube 43. During this process, the liquid refrigerant in the evaporator 33 absorbs the heat from the liquid output from the battery heat exchange plate and evaporates into gas, cooling the liquid output from the battery heat exchange plate. The cooled liquid is then transported back to the battery heat exchange plate through the return pipe 42. The third valve port 23 and the fourth valve port 24 are connected to ensure that the radiator 10 and condenser 32, connected by the condenser heat exchange pipe 45, exchange heat. During this process, the liquid output from the battery heat exchange plate in the radiator 10 is cooled by natural wind and then transported to the condenser through the condenser heat exchange pipe 45 to absorb the heat released by the gaseous refrigerant. It then returns to the radiator 10 through the condenser heat exchange pipe 45. The liquid cooling pipe 44 is disconnected from the return pipe 42 to prevent the high-temperature liquid that has undergone heat exchange in the condenser 32 from entering the battery heat exchange plate through the return pipe 42, thereby avoiding any impact on the cooling effect of the battery heat exchange plate.

[0033] In the second mode, the third valve port 23 and the fourth valve port 24 are not connected. At this time, heat exchange is no longer carried out through the compressor 31. Instead, the first valve port 21 and the fourth valve port 24 are connected, and the liquid cooling pipe 44 is connected to the return pipe 42. This allows the liquid output from the battery heat exchange plate to be directly transported to the radiator 10. After being cooled by the radiator 10 and natural air cooling, the liquid is transported back to the battery heat exchange plate through the liquid cooling pipe 44 and the return pipe 42.

[0034] This solution allows for the selection of different operating modes based on ambient temperature and other factors when the battery needs cooling at high temperatures. This avoids the need for the compressor 31 to run continuously for heat exchange, reducing the compressor 31's operating time and thus lowering system energy consumption, achieving energy conservation. Furthermore, the mode switching is achieved through the operation of the four-way valve 20, simplifying the system piping layout, making it easier to control, and saving costs.

[0035] like Figure 1 As shown, the battery heat exchange system also includes an outlet temperature sensor 61, a return temperature sensor 62, an ambient temperature sensor, and a controller. The outlet temperature sensor 61 is installed on the outlet pipe 41, the return temperature sensor 62 is installed on the return pipe 42, and the ambient temperature sensor is used to detect the temperature of the natural environment. The outlet temperature sensor 61, the return temperature sensor 62, the ambient temperature sensor, the four-way valve 20, and the compressor 31 are electrically connected to the controller.

[0036] In Embodiment 1 of this solution, the outlet liquid temperature sensor 61 is installed on the outlet pipe 41, which can monitor the temperature of the liquid output from the battery heat exchange plate in real time and feed this temperature data back to the controller. The return liquid temperature sensor 62 is installed on the return liquid pipe 42, which can monitor the temperature T1 of the return liquid in real time and feed this temperature data back to the controller. The ambient temperature sensor is used to detect the temperature T0 of the natural environment and feed this temperature data back to the controller. The controller compares T0 and T1 in real time and opens or closes the valve port of the four-way valve 20 according to different conditions, thereby switching between different modes.

[0037] When T1-T0≤0, it means that the ambient temperature T0 is greater than or equal to the return liquid temperature T1. At this time, the controller connects the first valve port 21 and the second valve port 22 of the four-way valve 20, and connects the third valve port 23 and the fourth valve port 24, switching to the first mode.

[0038] When T1-T0>0 and the cooling load is small, it means that the ambient temperature T0 is less than the return liquid temperature T1, but the return liquid temperature T1 is not much higher than the normal value. At this time, the controller connects the first valve port 21 and the fourth valve port 24 of the four-way valve 20, and closes the third valve port 23 and the fourth valve port 24, switching to the second mode.

[0039] When T1-T0>0 and the cooling load is very large, it means that the ambient temperature T0 is less than the return liquid temperature T1, but the return liquid temperature T1 is much higher than the normal value. At this time, the controller will switch the four-way valve 20 to the first mode.

[0040] In this solution, by monitoring and comparing the reflux liquid temperature T1 and the ambient temperature T0, the controller can dynamically adjust the working state of each component based on these comparison structures, ensuring that the battery temperature is kept within a suitable range under various environmental conditions.

[0041] In Embodiments 2 and 3 provided by this utility model, as Figure 2 and Figure 3 As shown, the four-way valve 20 also has a third mode. In the third mode, the compressor 31 is running, the first valve port 21 and the third valve port 23 are connected, the second valve port 22 and the fourth valve port 24 are closed, and the condensing heat exchange tube 45 and the return liquid tube 42 are connected.

[0042] In the third mode, the gaseous refrigerant in the compressor 31 is forced into the condenser 32, where it is compressed and releases heat to become liquid refrigerant, which is then transported back to the evaporator 33. In this mode, the first valve port 21 and the third valve port 23 are connected, and the liquid output from the battery heat exchange plate exchanges heat with the condenser 32 through the condenser heat exchange pipe 45. During this process, the liquid output from the battery heat exchange plate in the condenser 32 absorbs the heat released by the gaseous refrigerant as it becomes liquid refrigerant, raising the temperature of the liquid output from the battery heat exchange plate. The heated liquid is then transported back to the battery heat exchange plate through the return pipe 42.

[0043] In this solution, the third mode of the four-way valve 20 can provide a heating function for the battery, ensuring that the battery can operate within a suitable temperature range and preventing battery performance degradation or failure due to low temperature.

[0044] In Embodiments 2 and 3 provided by this utility model, as Figure 2 and Figure 3 As shown, the refrigerant circulation loop also includes a first pipe 34, a second pipe 35, a first branch pipe 36, a second branch pipe 37, and a third pipe 38. The two ends of the first pipe 34 are connected to the outlet of the compressor 31 and the inlet of the condenser 32, respectively. One end of the second pipe 35 is connected to the outlet of the condenser 32. One end of the first branch pipe 36 is connected to the other end of the second pipe 35, and the other end of the first branch pipe 36 is intermittently connected to the inlet of the evaporator 33. One end of the second branch pipe 37 is connected to the other end of the second pipe 35, and the other end of the second branch pipe 37 is intermittently connected to the inlet of the compressor 31. The two ends of the third pipe 38 are connected to the outlet of the evaporator 33 and the inlet of the compressor 31, respectively. In the first mode, the other end of the first branch pipe 36 is connected to the inlet of the evaporator 33, and the other end of the second branch pipe 37 is disconnected from the inlet of the compressor 31. In the third mode, the other end of the first branch pipe 36 is disconnected from the inlet of the evaporator 33, and the other end of the second branch pipe 37 is connected to the inlet of the compressor 31.

[0045] In the first mode, the first branch pipe 36 is connected to the inlet of the evaporator 33, and the second branch pipe 37 is disconnected from the inlet of the compressor 31. This ensures that in the first mode, the liquid refrigerant will not enter the compressor 31 from the second pipe 35, but will directly enter the evaporator 33 through the first branch pipe 36. This ensures that the liquid output from the battery heat exchange plate exchanges heat with the liquid refrigerant through the evaporator 33, thereby cooling the liquid and reducing the battery temperature.

[0046] In the third mode, the first branch pipe 36 is disconnected from the inlet of the evaporator 33, and the second branch pipe 37 is connected to the inlet of the compressor 31, ensuring that the path of refrigerant to the evaporator 33 is cut off, and ensuring that the refrigerant flows into the compressor 31 from the second pipe 35. At this time, the evaporator 33 does not work, and the liquid output from the battery heat exchange plate cannot exchange heat in the evaporator 33, thus avoiding the flow of the cooled liquid into the battery heat exchange plate and thus avoiding affecting the battery heating effect.

[0047] In this scheme, by switching different branch pipe connection paths, the flow direction of the refrigerant can be flexibly adjusted in different modes to achieve different temperature control requirements, thereby improving the adaptability of the battery heat exchange system to environmental changes and battery status.

[0048] In the second embodiment provided by this utility model, as Figure 2 As shown, the refrigerant circulation loop also includes a shut-off valve 51, a thermostatic expansion valve 52, and an electronic expansion valve 53. The shut-off valve 51 and the thermostatic expansion valve 52 are both installed on the first branch pipe 36, and the electronic expansion valve 53 is installed on the second branch pipe 37.

[0049] In the second embodiment of this solution, the shut-off valve 51 and the thermostatic expansion valve 52 are installed on the first branch pipe 36, which can control whether the refrigerant enters the first branch pipe 36 and the evaporator 33. When mode switching is required, the flow path of the refrigerant can be easily changed to prevent incorrect switching or leakage of the refrigerant flow path, ensuring that the refrigerant can flow along the predetermined path and avoiding unnecessary losses and malfunctions. The electronic expansion valve 53 is installed on the second branch pipe 37, which can regulate the flow rate of the refrigerant entering the compressor 31 and convert the liquid refrigerant into a gaseous refrigerant. This ensures that in the third mode, the liquid refrigerant flowing out of the condenser 32 can be converted into a gaseous refrigerant before entering the compressor 31, without affecting the subsequent process. Moreover, through the combined use of the shut-off valve 51, the thermostatic expansion valve 52 and the electronic expansion valve 53, the battery heat exchange system can select different operating modes according to the ambient temperature and other conditions, and adjust the flow rate, state and flow path of the refrigerant.

[0050] In the third embodiment provided by this utility model, as Figure 3 As shown, the refrigerant circulation loop also includes an electromagnetic thermostatic expansion valve 54 and an electronic expansion valve 53. The electromagnetic thermostatic expansion valve 54 is installed on the first branch pipe 36, and the electronic expansion valve 53 is installed on the second branch pipe 37.

[0051] In embodiment three of this solution, the electromagnetic thermostatic expansion valve 54 is installed on the first branch pipe 36, which can control whether the refrigerant enters the first branch pipe 36 and the evaporator 33. When mode switching is required, the flow path of the refrigerant can be easily changed to prevent incorrect switching or leakage of the refrigerant flow path, ensuring that the refrigerant can flow along the predetermined path and avoiding unnecessary losses and malfunctions. Moreover, replacing the shut-off valve 51 and the thermostatic expansion valve 52 with the electromagnetic thermostatic expansion valve 54 reduces the number of valves, thereby reducing the leakage points and costs of the entire battery heat exchange system. The electronic expansion valve 53 is installed on the second branch pipe 37, which can regulate the flow rate of the refrigerant entering the compressor 31 and convert the liquid refrigerant into a gaseous refrigerant. This ensures that in the third mode, the liquid refrigerant flowing out of the condenser 32 can be converted into a gaseous refrigerant before entering the compressor 31, without affecting the subsequent process. Furthermore, through the combined use of the electromagnetic thermostatic expansion valve 54 and the electronic expansion valve 53, the battery heat exchange system can select different operating modes according to ambient temperature and other conditions, and adjust the flow rate, state, and flow path of the refrigerant.

[0052] like Figure 1 As shown, the battery heat exchange system also includes a first water pump 71 and a second water pump 72. The first water pump 71 is installed on the liquid outlet pipe 41, and the second water pump 72 is installed on the liquid cooling pipe 44. In this embodiment, the first water pump 71, installed on the liquid outlet pipe 41, can drive the flow of liquid output from the battery heat exchange plate, ensuring that the liquid output from the battery heat exchange plate can flow smoothly into the cooling circuit for heat exchange, avoiding a decrease in heat transfer efficiency due to slow or obstructed flow of liquid output from the battery heat exchange plate. The second water pump 72, installed on the liquid cooling pipe 44, can drive the flow of liquid through the liquid cooling pipe 44, ensuring that the heat from the battery can be released to the external environment through the radiator 10.

[0053] like Figure 1 As shown, the radiator 10 is a water tank, and it is positioned on the windward side of the vehicle's front end to dissipate heat through natural airflow. In this embodiment, positioning the radiator 10 on the windward side of the vehicle's front end allows natural airflow to directly blow onto its surface, increasing the radiator 10's heat exchange efficiency and quickly removing heat generated by the battery, thanks to the relative motion between the vehicle and the air during driving. Furthermore, positioning the radiator 10 on the windward side of the vehicle's front end also makes efficient use of the space available for cooling equipment, avoiding excessive internal space occupation and preventing interference with other important components.

[0054] like Figure 1As shown, the battery heat exchange system also includes a fan 80, which dissipates heat from the radiator 10, which is located between the air intake grille at the front of the vehicle and the fan 80. In this embodiment, the fan 80 dissipates heat from the radiator 10 by absorbing natural wind, further accelerating the airflow and increasing the airflow speed on the surface of the radiator 10. This accelerates the heat exchange between the liquid inside the radiator 10 and the air, avoiding insufficient heat dissipation that may result from relying on natural wind flow, and enhancing the cooling effect of the entire battery heat exchange system. When T1-T0 > 0, and the cooling load is large or the natural ventilation cooling capacity is insufficient, the fan 80 can be turned on in addition to the second mode to force ventilation to the radiator 10, dissipating the heat of the high-temperature antifreeze in the radiator 10 into the environment. After the antifreeze cools down, it returns to the battery heat exchange plate to cool the battery. At this time, only the water pump and the fan 80 are activated, resulting in low energy consumption.

[0055] In the fourth embodiment provided by this utility model, as Figure 4 As shown, unlike the embodiments described above, the battery heat exchange system also includes an electric heater 90. The electric heater 90 is used to heat the liquid output from the battery heat exchange plate. When the electric heater 90 is running, the compressor 31 does not operate. In this fourth embodiment, the electric heater 90 can heat the battery heat exchange liquid at low temperatures, ensuring the battery operates within a suitable temperature range and preventing battery damage. This solution has the following beneficial effects:

[0056] The battery heat exchange system provided in this solution only requires the compressor 31 to be activated when the ambient temperature T0 is higher than the inlet water temperature T1, or when natural heat dissipation is insufficient to meet the cooling demand. During most of the year's lower-temperature periods, only the radiator 10 and fan 80 need to be activated individually to meet the battery's cooling requirements, significantly reducing energy consumption. This solution reduces the utilization rate of the compressor 31, thereby extending its lifespan and lowering usage and maintenance costs.

[0057] The above description is merely an optional embodiment of this solution and is not intended to limit the solution. Various modifications and variations can be made to this solution by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this solution should be included within the scope of protection of this solution.

[0058] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0059] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0060] In the description of this solution, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing this solution and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this solution. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0061] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0062] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this solution.

Claims

1. A battery heat exchange system, characterized in that, The system includes a refrigerant circulation loop, an antifreeze circulation loop, and a four-way valve (20). The antifreeze circulation loop includes a radiator (10) and a battery heat exchange plate, which is used to fit against the battery. The refrigerant circulation loop includes a compressor (31), a condenser (32), and an evaporator (33). The four ports of the four-way valve (20) are respectively connected to the battery heat exchange plate, the evaporator (33), the condenser (32), and the radiator (10). The four-way valve (20) can be switched to a first mode or a second mode. In the first mode, the compressor (31) operates, the liquid output from the battery heat exchange plate is cooled by the evaporator (33) and flows back to the battery heat exchange plate to cool the battery, and the liquid output from the condenser (32) is cooled by the radiator (10) and flows back to the condenser (32); in the second mode, the compressor (31) does not operate, the liquid output from the battery heat exchange plate is cooled by the radiator (10) and flows back to the battery heat exchange plate to cool the battery.

2. The battery heat exchange system according to claim 1, characterized in that, The four-way valve (20) also has a third mode in which the compressor (31) operates and the liquid output from the battery heat exchange plate is heated by the condenser (32) and flows back to the battery heat exchange plate.

3. The battery heat exchange system according to claim 1, characterized in that, The four-way valve (20) has a first valve port (21), a second valve port (22), a third valve port (23), and a fourth valve port (24). The battery heat exchange system also includes an outlet pipe (41), a return pipe (42), an evaporation heat exchange pipe (43), a liquid cooling pipe (44), and a condensation heat exchange pipe (45). The outlet pipe (41) is connected at both ends to the outlet of the battery heat exchange plate and the first valve port (21), respectively. The return pipe (42) is connected to the inlet of the battery heat exchange plate. The evaporation heat exchange pipe (43) is heat exchanged with the evaporator (33), and both ends of the evaporation heat exchange pipe (43) are connected to the second valve port (22) and the return pipe (42), respectively. The liquid cooling pipe (44) is heat exchanged with the radiator (10). One end of the liquid cooling pipe (44)... One end of the liquid cooling pipe (44) is connected to the fourth valve port (24), and the other end of the liquid cooling pipe (44) is connected to the return pipe (42) in a switchable manner. The condensing heat exchange pipe (45) and the condenser (32) are heat exchanged together, and the two ends of the condensing heat exchange pipe (45) are respectively connected to the third valve port (23) and the liquid cooling pipe (44). In the first mode, the first valve port (21) and the second valve port (22) are connected, the third valve port (23) and the fourth valve port (24) are connected, and the liquid cooling pipe (44) and the return pipe (42) are disconnected. In the second mode, the first valve port (21) and the fourth valve port (24) are connected, the third valve port (23) and the fourth valve port (24) are closed, and the liquid cooling pipe (44) and the return pipe (42) are connected.

4. The battery heat exchange system according to claim 3, characterized in that, The four-way valve (20) also has a third mode in which the compressor (31) is running, the first valve port (21) and the third valve port (23) are connected, the second valve port (22) and the fourth valve port (24) are closed, and the condenser heat exchange tube (45) and the return pipe (42) are connected.

5. The battery heat exchange system according to claim 4, characterized in that, The refrigerant circulation loop further includes a first pipe (34), a second pipe (35), a first branch pipe (36), a second branch pipe (37), and a third pipe (38). The first pipe (34) is connected at both ends to the outlet of the compressor (31) and the inlet of the condenser (32), respectively. One end of the second pipe (35) is connected to the outlet of the condenser (32). One end of the first branch pipe (36) is connected to the other end of the second pipe (35), and the other end of the first branch pipe (36) is intermittently connected to the inlet of the evaporator (33). One end of the second branch pipe (37) is connected to the other end of the second pipe (35), and the other end of the second branch pipe (37) is intermittently connected to the inlet of the compressor (31). The third pipe (38) is connected at both ends to the outlet of the evaporator (33) and the inlet of the compressor (31), respectively. In the first mode, the other end of the first branch pipe (36) is connected to the inlet of the evaporator (33), and the other end of the second branch pipe (37) is disconnected from the inlet of the compressor (31); In the third mode, the other end of the first branch pipe (36) is disconnected from the inlet of the evaporator (33), and the other end of the second branch pipe (37) is connected to the inlet of the compressor (31).

6. The battery heat exchange system according to claim 5, characterized in that, The refrigerant circulation loop also includes a shut-off valve (51), a thermostatic expansion valve (52), and an electronic expansion valve (53). The shut-off valve (51) and the thermostatic expansion valve (52) are both installed on the first branch pipe (36), and the electronic expansion valve (53) is installed on the second branch pipe (37).

7. The battery heat exchange system according to claim 5, characterized in that, The refrigerant circulation loop also includes an electromagnetic thermostatic expansion valve (54) and an electronic expansion valve (53). The electromagnetic thermostatic expansion valve (54) is installed on the first branch pipe (36), and the electronic expansion valve (53) is installed on the second branch pipe (37).

8. The battery heat exchange system according to claim 3, characterized in that, The battery heat exchange system also includes an outlet temperature sensor (61), a return temperature sensor (62), an ambient temperature sensor, and a controller. The outlet temperature sensor (61) is installed on the outlet pipe (41), the return temperature sensor (62) is installed on the return pipe (42), and the ambient temperature sensor is used to detect the temperature of the natural environment. The outlet temperature sensor (61), the return temperature sensor (62), the ambient temperature sensor, the four-way valve (20), and the compressor (31) are electrically connected to the controller.

9. The battery heat exchange system according to claim 3, characterized in that, The battery heat exchange system also includes a first water pump (71) and a second water pump (72), the first water pump (71) being installed on the liquid outlet pipe (41) and the second water pump (72) being installed on the liquid cooling pipe (44).

10. The battery heat exchange system according to claim 1, characterized in that, The radiator (10) is located on the windward side of the front of the vehicle so that it can dissipate heat through the flowing natural wind.

11. The battery heat exchange system according to claim 10, characterized in that, The battery heat exchange system also includes a fan (80) that dissipates heat from the radiator (10), which is located between the air intake grille at the front of the vehicle and the fan (80).

12. The battery heat exchange system according to claim 1, characterized in that, The battery heat exchange system also includes an electric heater (90) for heating the liquid output from the battery heat exchange plate. When the electric heater (90) is running, the compressor (31) does not run.

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