Battery thermal management system and control method thereof

Abstract

The application provides a battery thermal management system and a control method thereof. The battery thermal management system comprises a compressor, a condenser, a first throttling device, an evaporator, a heat exchanger and a battery system assembly. A refrigerant circulation loop and an antifreeze circulation loop can exchange heat at the heat exchanger. The battery thermal management system further comprises a condensate water pipeline. One end of the condensate water pipeline is communicated with the bottom of the evaporator to guide the condensate water generated by the evaporator out, and the other end is communicated with the condenser, so that the refrigerant and the condensate water exchange heat in the condenser. A plurality of condensate water flow channels and a plurality of first refrigerant flow channels are arranged in the condenser, and the condensate water flow channels and the first refrigerant flow channels are staggered with each other. At least one first refrigerant flow channel is arranged between two adjacent condensate water flow channels, and at least one condensate water flow channel is arranged between two adjacent first refrigerant flow channels. According to the application, the condensate water can be effectively reused, the heat recovery can be realized, and the heat exchange efficiency of the condensate water can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery thermal management, in particular to a battery thermal management system and a control method thereof. BACKGROUND

[0002] With the continuous improvement of people's living standards, people's demand for travel quality is also improving. In addition, the state has introduced a series of new energy vehicle preferential policies, so the pure electric vehicle industry has developed rapidly in recent years. At present, most of the condensate water of the air conditioner on the market is directly discharged to the outside environment by a water pipe, causing waste of water resources. In order to respond to the call of the state to save energy, the condensate water recycling of the new energy vehicle air conditioner has become a problem to be solved. With the rapid development of new energy vehicles, the technical requirements for battery heating and cooling are also increasing, and the cooling technology requirements for vehicle electronic control and engine are also increasing.

[0003] Since the battery thermal management system in the prior art cannot simultaneously solve the problems of condensate water recycling and improving heat exchange efficiency, the present application researches and designs a battery thermal management system and a control method thereof. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects of the battery thermal management system in the prior art that cannot simultaneously solve the problems of condensate water recycling and improving heat exchange efficiency, thereby providing a battery thermal management system and a control method thereof.

[0005] In order to solve the above problems, the present application provides a battery thermal management system, which comprises:

[0006] A compressor, a condenser, a first throttling device, an evaporator, a heat exchanger and a battery system assembly, the compressor, the condenser, the first throttling device, the evaporator and the heat exchanger are arranged in a refrigerant circulation loop, the heat exchanger and the battery system assembly are arranged in an antifreeze circulation loop, the refrigerant circulation loop and the antifreeze circulation loop can exchange heat at the heat exchanger, the battery thermal management system further comprises a condensate water pipeline, one end of the condensate water pipeline is communicated with the bottom of the evaporator to guide the condensate water generated by the evaporator out, the other end is communicated with the condenser, so that the refrigerant and the condensate water exchange heat in the condenser.

[0007] A plurality of condensate water flow channels and a plurality of first refrigerant flow channels are arranged in the condenser, and the condensate water flow channels and the first refrigerant flow channels are arranged alternately, at least one first refrigerant flow channel is arranged between adjacent two condensate water flow channels, and at least one condensate water flow channel is arranged between adjacent two first refrigerant flow channels.

[0008] In some embodiments, the condenser is provided with a condensate water inlet and a condensate water outlet, one end of the condensate water inlet is in communication with the condensate water pipeline, the other end is in communication with the condensate water flow channel, and the condensate water outlet is in communication with the condensate water flow channel, so that the condensate water in the condensate water flow channel after heat exchange can be discharged.

[0009] The condenser is provided with a condenser refrigerant inlet and a condenser refrigerant outlet, one end of the condenser refrigerant inlet is in communication with the external refrigerant pipeline, the other end is in communication with the first refrigerant flow channel, one end of the condenser refrigerant outlet is in communication with the first refrigerant flow channel, the other end is in communication with the external refrigerant pipeline, so that the refrigerant after heat exchange can be discharged.

[0010] In some embodiments, the refrigerant pipeline between the heat exchanger and the suction port of the compressor is further provided with a first control valve, and the battery thermal management system further comprises a bypass pipeline and a three-way valve, one end of the bypass pipeline is connected to the refrigerant pipeline between the first control valve and the suction port of the compressor, the other end is connected to the refrigerant pipeline between the heat exchanger and the evaporator, and the three-way valve is arranged at the intersection of the refrigerant pipeline between the heat exchanger and the evaporator and the bypass pipeline.

[0011] In some embodiments, the condensate water pipeline is further provided with a filtering device; the inside of the evaporator is further provided with an electric heater, which can heat the condensate water to evaporate.

[0012] In some embodiments, a plurality of antifreeze flow channels and a plurality of second refrigerant flow channels are arranged in the heat exchanger, and the antifreeze flow channels and the second refrigerant flow channels are arranged alternately, at least one second refrigerant flow channel is arranged between two adjacent antifreeze flow channels, and at least one antifreeze flow channel is arranged between two adjacent second refrigerant flow channels.

[0013] In some embodiments, the heat exchanger is provided with a heat exchanger antifreeze inlet and a heat exchanger antifreeze outlet, one end of the heat exchanger antifreeze inlet is in communication with the antifreeze pipeline, the other end is in communication with the antifreeze flow channel, one end of the heat exchanger antifreeze outlet is in communication with the antifreeze flow channel, the other end is in communication with the antifreeze pipeline, so that the antifreeze in the antifreeze flow channel after heat exchange can be discharged.

[0014] The heat exchanger is provided with a heat exchanger refrigerant inlet and a heat exchanger refrigerant outlet, one end of the heat exchanger refrigerant inlet is in communication with the external refrigerant pipeline, the other end is in communication with the second refrigerant flow channel, one end of the heat exchanger refrigerant outlet is in communication with the second refrigerant flow channel, the other end is in communication with the external refrigerant pipeline, so that the refrigerant after heat exchange can be discharged.

[0015] In some embodiments, the battery thermal management system further comprises a motor control system assembly, an engine system assembly, a first pipe, a second pipe, a third pipe, a fourth pipe, a fifth pipe, a sixth pipe, and a PTC auxiliary heater, one end of the battery system assembly is in communication with one end of the motor control system assembly through the first pipe, the other end of the battery system assembly is in communication with one end of the engine system assembly through the second pipe, the other end of the motor control system assembly is in communication with the antifreeze flow channel of the heat exchanger through the third pipe, the other end of the engine system assembly is in communication with the antifreeze flow channel of the heat exchanger through the fourth pipe, one end of the fifth pipe is in communication with the first pipe and the other end is in communication with the third pipe, one end of the sixth pipe is in communication with the second pipe and the other end is in communication with the fourth pipe, and the PTC auxiliary heater is arranged on the fifth pipe.

[0016] In some embodiments, the battery thermal management system further comprises a second control valve, a third control valve, a one-way valve, and a water pump, the second control valve is arranged on the third pipe between the motor control system assembly and the fifth pipe, the third control valve is arranged on the second pipe between the sixth pipe and the engine system assembly, the one-way valve is arranged on the third pipe between the fifth pipe and the heat exchanger and only allows fluid to flow out of the heat exchanger, and the water pump is arranged on the fourth pipe between the sixth pipe and the heat exchanger.

[0017] In some embodiments, the battery thermal management system further comprises a second throttling device, a third throttling device, a seventh pipe, an eighth pipe, and a water tank, one end of the seventh pipe is in communication with the third pipe, the other end of the seventh pipe is in communication with one end of the water tank, one end of the eighth pipe is in communication with the fourth pipe, the other end of the eighth pipe is in communication with the other end of the water tank, the second throttling device is arranged on the seventh pipe, and the third throttling device is arranged on the eighth pipe.

[0018] In some embodiments, the battery thermal management system further comprises a fan and a gas-liquid separator, the fan is arranged at the heat exchanger to provide air flow for heat exchange of the heat exchanger, and the gas-liquid separator is arranged at the suction port of the compressor.

[0019] The battery thermal management system further comprises a solar panel assembly and an energy storage battery, the solar panel assembly is electrically connected to the energy storage battery, and the energy storage battery is electrically connected to the fan.

[0020] The application also provides a control method of the battery thermal management system as described in any one of the preceding embodiments, wherein when the battery thermal management system comprises an electric heater, the control method comprises:

[0021] The control method comprises:

[0022] determining whether the vehicle is in a cooling mode;

[0023] controlling the compressor to start if the vehicle is in the cooling mode, and controlling the compressor to stop and the electric heater to start if the vehicle is in the heating mode.

[0024] In some embodiments, when the battery thermal management system further comprises a three-way valve:

[0025] detecting a temperature of the battery system assembly;

[0026] determining whether the temperature of the battery system assembly is higher than a first preset temperature;

[0027] controlling the three-way valve to make the heat exchanger communicate with the evaporator and controlling the compressor to start if the temperature of the battery system assembly is higher than the first preset temperature.

[0028] In some embodiments, when the battery thermal management system further comprises a second control valve and a third control valve:

[0029] detecting a temperature of the motor electronic control system assembly and detecting a temperature of the engine system;

[0030] determining whether the temperature of the motor electronic control system assembly is higher than a second preset temperature and determining whether the temperature of the engine system is higher than a third preset temperature;

[0031] controlling the second control valve to open if the temperature of the motor electronic control system assembly is higher than the second preset temperature, and controlling the third control valve to open if the temperature of the engine system is higher than the third preset temperature.

[0032] In some embodiments, the determining step determines whether the temperature of the battery system assembly is lower than a fourth preset temperature;

[0033] controlling the three-way valve to make the heat exchanger not communicate with the evaporator, and controlling the second control valve to open and the third control valve to open, and controlling the compressor to stop if the temperature of the battery system assembly is lower than the fourth preset temperature.

[0034] In some embodiments, when the battery thermal management system further comprises a PTC auxiliary heater:

[0035] the determining step determines whether the temperature of the battery system assembly is lower than a fifth preset temperature, wherein the fifth preset temperature is lower than the fourth preset temperature;

[0036] The control step also controls the PTC auxiliary heating to be turned on when the temperature of the battery system assembly is lower than the fifth preset temperature.

[0037] The battery thermal management system and the control method thereof have the following beneficial effects:

[0038] 1. The battery thermal management system has the following advantages: the refrigerant circulation loop and the anti-freezing liquid circulation loop are arranged, the compressor, the condenser, the evaporator and other components are arranged on the refrigerant circulation loop, the battery system assembly is arranged on the anti-freezing liquid circulation loop, and the refrigerant circulation loop and the anti-freezing liquid circulation loop exchange heat through the heat exchanger, so that the refrigerant in the refrigerant circulation loop can effectively cool the anti-freezing liquid, the battery system assembly is effectively exchanged, the heat management of the battery is effectively realized, the condensate water pipeline is arranged, the condensate water in the evaporator is introduced into the condenser through the condensate water pipeline to exchange heat, the refrigerant in the condenser is cooled and cooled, the condensate water is effectively recycled, the problem of recycling of the condensate water is effectively solved, and the heat exchange area between the condensate water and the refrigerant is effectively increased through the staggered and integrated structure design between the condensate water flow channel and the first refrigerant flow channel in the condenser, so that the heat exchange efficiency between the condensate water and the refrigerant is improved.

[0039] 2. The heat exchange efficiency between the refrigerant and the anti-freezing liquid at the heat exchanger is effectively improved through the staggered and integrated structure design between the anti-freezing liquid and the refrigerant at the heat exchanger, various management modes of the system are achieved, the motor electric control and the engine are effectively cooled, and the heat is effectively recycled, for example, the heat exchange efficiency of the condenser in the refrigerant circulation loop is improved, the battery is heated when heating is needed, the hot water of the water tank is heated, and hot water is prepared, so that the battery thermal management system provides technical support for cooling and heating of the battery and cooling of the motor electric control and the engine. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a system structure diagram of the battery thermal management system of the present application;

[0041] Figure 2 is a structure diagram of a solar panel part of the present application;

[0042] Figure 3 is a structure diagram of a condenser of the present application;

[0043] Figure 3ayes Figure 3 A magnified view of part A in the middle;

[0044] Figure 4 This is a structural diagram of the heat exchanger of the present invention;

[0045] Figure 4a yes Figure 4 A magnified view of part B in the middle section.

[0046] The reference numerals in the attached figures are as follows:

[0047] 1. Compressor; 2. Gas-liquid separator; 3. Condenser; 301. Condensate flow channel; 302. First refrigerant flow channel; 4. First throttling device; 5. Evaporator; 6. Electric heater; 7. Heat exchanger; 71. Antifreeze flow channel; 72. Second refrigerant flow channel; 8. Fan; 9. PTC auxiliary heater; 10. Motor and electronic control system assembly; 11. Battery system assembly; 12. Engine system assembly; 13. Water tank; 14. Second throttling device; 15. Third throttling device; 16. Second control valve; 17. First control valve; 18. Third control valve; 19. Three-way valve; 20. Check valve; 21. Water pump; 22. Solar panel assembly; 23. Filter device; 24. Condensate drain outlet; 25. Condensate inlet; 26. Condenser refrigerant inlet; 27. Condenser refrigerant outlet; 28. Heat exchanger refrigerant inlet; 29. ​​Heat exchanger antifreeze inlet; 30. Heat exchanger refrigerant outlet; 31. Heat exchanger antifreeze outlet; 32. Energy storage battery;

[0048] 100. Condensate pipe; 200. Bypass pipe; 101. First pipe; 102. Second pipe; 103. Third pipe; 104. Fourth pipe; 105. Fifth pipe; 106. Sixth pipe; 107. Seventh pipe; 108. Eighth pipe. Detailed Implementation

[0049] like Figures 1-4 As shown, the present invention provides a battery thermal management system, which includes:

[0050] The system comprises a compressor 1, a condenser 3, a first throttling device 4, an evaporator 5, a heat exchanger 7, and a battery system assembly 11. The compressor 1, the condenser 3, the first throttling device 4, the evaporator 5, and the heat exchanger 7 are arranged in a refrigerant circulation loop, and the heat exchanger 7 and the battery system assembly 11 are arranged in an antifreeze circulation loop. The refrigerant circulation loop and the antifreeze circulation loop can exchange heat at the heat exchanger 7. The battery thermal management system also includes a condensate pipe 100. One end of the condensate pipe 100 is connected to the bottom of the evaporator 5 to discharge the condensate produced by the evaporator 5, and the other end is connected to the condenser 3, so that the refrigerant and the condensate exchange heat in the condenser 3.

[0051] A plurality of condensate water flow channels 301 and a plurality of first refrigerant flow channels 302 are arranged in the condenser 3 from one end to the other end, and the condensate water flow channels 301 and the first refrigerant flow channels 302 are arranged alternately, at least one first refrigerant flow channel 302 is arranged between two adjacent condensate water flow channels 301, and at least one condensate water flow channel 301 is arranged between two adjacent first refrigerant flow channels 302.

[0052] The battery thermal management system of the present application can effectively utilize the refrigerant in the refrigerant circulation loop to cool the anti-freezing liquid, effectively exchange heat with the battery system assembly, effectively realize thermal management of the battery, and effectively recycle the condensate water, effectively solve the problem of recycling of the condensate water, and effectively improve the heat exchange area and heat exchange efficiency between the condensate water and the refrigerant.

[0053] The present application solves the following technical problems

[0054] 1. The problem of recycling of the condensate water is solved.

[0055] 2. The problem of battery cooling and heating is solved.

[0056] 3. The problem of motor control and engine cooling is solved.

[0057] 1. The present application solves the problem of recycling of the condensate water by recycling the condensate water, and provides technical support for battery cooling and heating, and technical support for motor control and engine cooling.

[0058] 2. The condenser of the present application adopts the integrated design of refrigerant and water, connects the condensate water to the condenser, and achieves recycling of the condensate water.

[0059] 3. The heat exchange plate of the present application adopts the integrated design of anti-freezing liquid and refrigerant, and can achieve multiple management modes of the system.

[0060] 4. The application can realize different power supply systems of various modes by adding a solar cell power supply system.

[0061] In some embodiments, the condenser 3 is provided with a condensate water inlet 25 and a condensate water outlet 24, one end of the condensate water inlet 25 being in communication with the condensate water pipeline 100 and the other end being in communication with the condensate water flow channel 301, and the condensate water outlet 24 being in communication with the condensate water flow channel 301 to enable the condensate water in the condensate water flow channel 301 to be discharged after heat exchange;

[0062] The condenser 3 is provided with a condenser refrigerant inlet 26 and a condenser refrigerant outlet 27, one end of the condenser refrigerant inlet 26 being in communication with an external refrigerant pipeline and the other end being in communication with the first refrigerant flow channel 302, and one end of the condenser refrigerant outlet 27 being in communication with the first refrigerant flow channel 302 and the other end being in communication with an external refrigerant pipeline to enable the refrigerant after heat exchange to be discharged.

[0063] This is a further preferred structure of the condenser of the application, that is, the condensate water is introduced into the condensate water flow channel from the condensate water pipeline through the condensate water inlet, and after heat exchange with the refrigerant in the condensate water flow channel, the condensate water is discharged through the condensate water outlet; the refrigerant is introduced into the first refrigerant flow channel from the refrigerant pipeline through the condenser refrigerant inlet to exchange heat with the condensate water, and the refrigerant after heat exchange enters the refrigerant pipeline through the condenser refrigerant outlet and enters the first throttling device for throttling.

[0064] In some embodiments, the refrigerant pipeline between the heat exchanger 7 and the suction port of the compressor 1 is further provided with a first control valve 17, and the battery thermal management system further comprises a bypass pipeline 200 and a three-way valve 19, one end of the bypass pipeline 200 being in communication with the refrigerant pipeline between the first control valve 17 and the suction port of the compressor 1, and the other end being in communication with the refrigerant pipeline between the heat exchanger 7 and the evaporator 5, and the three-way valve 19 being arranged at the intersection of the refrigerant pipeline between the heat exchanger 7 and the evaporator 5 and the bypass pipeline 200. The application can control whether the heat exchanger is in communication with the suction port of the compressor through the arrangement of the first control valve, that is, whether the refrigerant circulating loop of the battery system assembly exchanges heat with the refrigerant at the heat exchanger; the arrangement of the bypass pipeline can control the heat exchanger to be disconnected by controlling the three-way valve when the battery and the like do not need to be cooled, and the heat exchanger to be connected by controlling the three-way valve when the battery and the like need to be cooled, so that the refrigerant cools the antifreeze, thereby cooling the battery, the motor, the electronic control device and the engine and the like.

[0065] In some embodiments, the condensate pipeline 100 is further provided with a filter device 23; the inside of the evaporator 5 is further provided with an electric heater 6, which can heat the condensate evaporation. The present application can effectively filter the condensate introduced into the condensate pipeline through the filter device, and heat the evaporator 5 through the electric heater. When heating is needed in the room or in the car, the air is blown into the room or the car through the electric heater, and the compressor is not started at this time.

[0066] In some embodiments, a plurality of anti-freezing liquid flow channels 71 and a plurality of second refrigerant flow channels 72 are arranged in the heat exchanger 7 from one end to the other end, and the anti-freezing liquid flow channels 71 and the second refrigerant flow channels 72 are arranged in an interlaced manner, at least one second refrigerant flow channel 72 is arranged between two adjacent anti-freezing liquid flow channels 71, and at least one anti-freezing liquid flow channel 71 is arranged between two adjacent second refrigerant flow channels 72. The interlaced structure design between the anti-freezing liquid and the refrigerant in the heat exchanger can effectively improve the heat exchange efficiency between the refrigerant and the anti-freezing liquid in the heat exchanger, and achieve multiple management modes of the system.

[0067] In some embodiments, the heat exchanger 7 is provided with a heat exchanger anti-freezing liquid inlet 29 and a heat exchanger anti-freezing liquid outlet 31. One end of the heat exchanger anti-freezing liquid inlet 29 is in communication with the anti-freezing liquid pipeline, and the other end is in communication with the anti-freezing liquid flow channel 71. One end of the heat exchanger anti-freezing liquid outlet 31 is in communication with the anti-freezing liquid flow channel 71, and the other end is in communication with the anti-freezing liquid pipeline, so as to discharge the anti-freezing liquid in the anti-freezing liquid flow channel 71 after heat exchange.

[0068] The heat exchanger 7 is provided with a heat exchanger refrigerant inlet 28 and a heat exchanger refrigerant outlet 30. One end of the heat exchanger refrigerant inlet 28 is in communication with the external refrigerant pipeline, and the other end is in communication with the second refrigerant flow channel 72. One end of the heat exchanger refrigerant outlet 30 is in communication with the second refrigerant flow channel 72, and the other end is in communication with the external refrigerant pipeline, so as to discharge the refrigerant after heat exchange.

[0069] This is a further preferred structure of the condenser of the present application, that is, the anti-freezing liquid is introduced into the anti-freezing liquid flow channel from the anti-freezing liquid pipeline through the heat exchanger anti-freezing liquid inlet, and is discharged after heat exchange with the refrigerant in the anti-freezing liquid flow channel through the heat exchanger anti-freezing liquid outlet. The refrigerant is introduced into the second refrigerant flow channel from the refrigerant pipeline through the heat exchanger refrigerant inlet, and is heated with the anti-freezing liquid. The refrigerant after heat exchange is introduced into the refrigerant pipeline through the heat exchanger refrigerant outlet, and enters the suction port of the compressor.

[0070] In some embodiments, the battery system assembly 11 is in communication with one end of the motor electronic control system assembly 10 through the first pipeline 101, and the other end of the battery system assembly 11 is in communication with one end of the engine system assembly 12 through the second pipeline 102, the other end of the motor electronic control system assembly 10 is in communication with the antifreeze flow channel 71 of the heat exchanger 7 through the third pipeline 103, the other end of the engine system assembly 12 is in communication with the antifreeze flow channel 71 of the heat exchanger 7 through the fourth pipeline 104, one end of the fifth pipeline 105 is in communication with the first pipeline 101, and the other end is in communication with the third pipeline 103, one end of the sixth pipeline 106 is in communication with the second pipeline 102, and the other end is in communication with the fourth pipeline 104, and the PTC auxiliary heating 9 is arranged on the fifth pipeline 105.

[0071] The battery thermal management system of the present application provides technical support for the cooling and heating of the battery, and provides technical support for the cooling of the motor electronic control and the engine. The PTC auxiliary heating is arranged to heat the battery by the heat of the motor electronic control, the heat of the engine, and the heat of the PTC auxiliary heating when the temperature of the battery is lower.

[0072] In some embodiments, the second control valve 16 is arranged on the third pipeline 103 between the motor electronic control system assembly 10 and the fifth pipeline 105, the third control valve 18 is arranged on the second pipeline 102 between the sixth pipeline 106 and the engine system assembly 12, the one-way valve 20 is arranged on the third pipeline 103 between the fifth pipeline 105 and the heat exchanger 7, and the one-way valve 20 only allows fluid to flow outwards from the heat exchanger 7, and the water pump 21 is arranged on the fourth pipeline 104 between the sixth pipeline 106 and the heat exchanger 7. The above-mentioned control valves and water pump can effectively switch the battery between the antifreeze circulation system and the antifreeze circulation system of the battery, the motor electronic control, and the engine, to meet the thermal management requirements of the battery, the motor, and the engine.

[0073] In some embodiments, the second throttling device 14, the third throttling device 15, the seventh pipeline 107, the eighth pipeline 108 and the water tank 13 are further included, one end of the seventh pipeline 107 is communicated with the third pipeline 103, the other end of the seventh pipeline 107 is communicated with one end of the water tank 13, one end of the eighth pipeline 108 is communicated with the fourth pipeline 104, the other end of the eighth pipeline 108 is communicated with the other end of the water tank 13, the second throttling device 14 is arranged on the seventh pipeline 107, and the third throttling device 15 is arranged on the eighth pipeline 108. The water tank, the plurality of pipelines and the plurality of throttling devices are arranged, heat can be recovered to obtain hot water, and the throttling devices can balance and prevent the pressure of the antifreeze.

[0074] In some embodiments, the fan 8 is arranged at the heat exchanger 7 to provide air flow for heat exchange of the heat exchanger 7, and the gas-liquid separator 2 is arranged at the suction port of the compressor 1.

[0075] The solar panel assembly 22 and the energy storage battery 32 are further included, the solar panel assembly 22 is electrically connected with the energy storage battery 32, and the energy storage battery 32 is electrically connected with the fan 8.

[0076] The solar panel assembly can absorb solar energy and generate electricity to supply the fan, so that the energy efficiency is improved.

[0077] The heat exchanger 7, the PTC auxiliary heater 9, the fan 8 (preferably an axial flow fan), the water tank 13 (preferably an expansion water tank) and the compressor 1, the condenser 3, the evaporator 5 and the first throttling device 4 in the four major parts of the air conditioner form a complete battery thermal management system. The condenser 3 collects the condensate water in the evaporator for reheat, and the axial flow fan of the heat exchanger 7 dissipates heat, forming an independent condenser heat dissipation system. The solar panel assembly 22 collects solar energy and converts it into electrical energy and stores it in the energy storage battery 32 for standby, and the energy storage battery can supply power to the fan 8, the second throttling device 14, the third throttling device 15, the second control valve 16, the first control valve 17, the third control valve 18, the three-way valve 19 and the water pump 21.

[0078] The application further provides a control method of the battery thermal management system as described in any one of the preceding embodiments, wherein when the battery thermal management system includes the electric heater 6:

[0079] The control method includes:

[0080] A judging step of judging whether the refrigeration mode is started in the vehicle;

[0081] The control step controls the compressor to start if the refrigeration mode is turned on in the vehicle, and controls the compressor to stop and controls the electric heater 6 to open if the heating mode is turned on in the vehicle.

[0082] In some embodiments, when the battery thermal management system comprises a three-way valve 19:

[0083] The detection step detects the temperature of the battery system assembly;

[0084] The judgment step judges whether the temperature of the battery system assembly is higher than a first preset temperature;

[0085] The control step controls the three-way valve 19 to make the heat exchanger 7 communicate with the evaporator 5 and controls the compressor to start when the temperature of the battery system assembly is higher than the first preset temperature.

[0086] When the refrigeration mode is turned on in the vehicle, the compressor 1 starts, the refrigerant in the gaseous state is sucked into the compressor from the compressor inlet, and the refrigerant is compressed by the compressor to be in the high-temperature and high-pressure state and is discharged from the compressor exhaust port. At this time, the high-temperature and high-pressure state refrigerant enters the condenser 3 from the condenser inlet, and the refrigerant is condensed into a high-temperature and high-pressure liquid in the condenser, and then enters the throttling short pipe (first throttling device 4) from the condenser outlet through the refrigerant pipe. The refrigerant becomes low-temperature and low-pressure liquid refrigerant after passing through the throttling short pipe and then enters the evaporator 5 to evaporate and absorb heat. At this time, the condensed water on the surface of the evaporator is collected by the water collecting plate in the evaporator assembly and is discharged through the drain pipe connected to the evaporator drain port into the condenser for heat exchange. The specific heat exchange structure in the condenser can be seen from Figure 3 ; The drain pipe is provided with a detachable filter drain device (filter device 23) which can filter out impurities in the condensed water to prevent the water passage in the condenser from being blocked. When too much impurity in the filter drain device causes the condensed water to not enter the condenser, the condensed water can be discharged from the filter drain device, and the filter can also be detached for cleaning. After the low-temperature and low-pressure liquid refrigerant evaporates and absorbs heat in the evaporator, the low-temperature and low-pressure gaseous refrigerant is discharged from the evaporator outlet and enters the three-way valve 19. At this time, if the temperature sensing bag in the battery system assembly 11 detects that the battery temperature does not reach the required cooling requirement, the three-way valve closes the opening of the heat exchanger 7, and the refrigerant directly enters the gas-liquid separator 2 from the other end of the three-way valve, and then enters the compressor for circulation.

[0087] In some embodiments, when the battery thermal management system further comprises a second control valve 16 and a third control valve 18:

[0088] The detection step further detects the temperature of the motor electronic control system assembly and detects the temperature of the engine system assembly;

[0089] The judging step judges whether the temperature of the motor electronic control system assembly is higher than a second preset temperature and whether the temperature of the engine system assembly is higher than a third preset temperature;

[0090] The controlling step controls the second control valve 16 to open when the temperature of the motor electronic control system assembly is higher than the second preset temperature and controls the third control valve 18 to open when the temperature of the engine system assembly is higher than the third preset temperature.

[0091] In the refrigeration mode, if the temperature sensing bag in the motor electronic control system assembly 10, the temperature sensing bag in the battery system assembly 11 and the temperature sensing bag in the engine system assembly 12 detect that they need to be cooled down during the starting of the vehicle, the water pump 21 is powered on by the battery in the vehicle at this time, the antifreeze enters the heat exchange plate inlet, is cooled down by the fan 8 in the heat exchange plate and then comes out from the heat exchange plate outlet, passes through the one-way valve 20 at this time, the openings of the second control valve 16, the first control valve 17 and the third control valve 18 (all preferably electromagnetic valves) are opened, the low-temperature antifreeze flows through the motor electronic control system assembly 10, the battery system assembly 11 and the engine system assembly 12 and cools them down, and finally the high-temperature antifreeze reenters the water pump 21 to form a circulation system; the water tank 13 is arranged in the system, and the second throttling device 14 and the third throttling device 15 (both preferably thermal expansion valves) are opened when the antifreeze expands and contracts with heat and cold, and the expansion tank balances the pressure of the system.

[0092] In this mode, if the temperature sensing bag in the motor electronic control system assembly 10, the temperature sensing bag in the battery system assembly 11 and the temperature sensing bag in the engine system assembly 12 detect that the temperature is too high, the three-way valve 19 is opened through the opening on the side of the heat exchanger 7 and is closed on the side of the gas-liquid separator 2 at this time. At this time, the low-temperature and low-pressure gaseous refrigerant in the system enters the heat exchanger, exchanges heat with the antifreeze in the heat exchanger and then enters the gas-liquid separator 2, and the flow paths of the antifreeze and the refrigerant in the heat exchange plate are shown in Figure 4 The ultra-low-temperature antifreeze after being cooled down by the refrigerant and the fan 8 continues to circulate and be cooled down by the motor electronic control system assembly 10, the battery system assembly 11 and the engine system assembly 12.

[0093] In some embodiments, the judging step judges whether the temperature of the battery system assembly is lower than a fourth preset temperature;

[0094] The controlling step controls the three-way valve 19 to make the heat exchanger 7 not communicate with the evaporator 5, controls the second control valve 16 to open and the third control valve 18 to open and controls the compressor to close when the temperature of the battery system assembly is lower than the fourth preset temperature.

[0095] When the vehicle is charging, if the temperature sensor in the battery system assembly 11 detects that the battery needs to be cooled, the second control valve 16 and the third control valve 18 are closed, the water pump 21 is opened, the fan 8 is opened, and the antifreeze solution only circulates in the battery system assembly 11 and the heat exchanger 7 to cool the battery system assembly 11; if the temperature sensor in the battery system assembly 11 detects that the temperature is too high, a part of the electricity provided by the charging pile will forcibly start the compressor 1, so that the low-temperature and low-pressure refrigerant flows through the heat exchanger 7, and the fan 8 makes the antifreeze solution become a super-low-temperature state, and then is recycled to the battery system assembly 11 to cool it.

[0096] In some embodiments, when the battery thermal management system further comprises a PTC auxiliary heater 9:

[0097] The determining step determines whether the temperature of the battery system assembly is lower than a fifth preset temperature, wherein the fifth preset temperature is lower than the fourth preset temperature;

[0098] The controlling step further controls the PTC auxiliary heater 9 to be turned on when the temperature of the battery system assembly is lower than the fifth preset temperature.

[0099] When the vehicle is in a low-temperature environment, the central control screen in the vehicle is turned on to heat mode, the PTC electric heating (electric heater 6) is powered on, at the same time, the mode damper in the evaporator 5 is switched to heating, the cross-flow fan in the evaporator 5 is turned on, the air blown by the cross-flow fan flows through the PTC electric heating, and then is blown out from the air outlet to heat the environment in the vehicle. When the temperature sensor in the battery system assembly 11 detects that the battery temperature needs to be heated, the second control valve 16 and the third control valve 18 are opened, the water pump 21 is opened, the fan 8 is closed, the antifreeze solution flows through the motor and electronic control system assembly 10, and the heat collected by the engine system assembly 12, and then flows through the battery system assembly 11 to heat it. If the temperature sensor detects that the temperature of the battery system assembly 11 is too low, the PTC auxiliary heater 9 is powered on, the openings of the second control valve 16 and the third control valve 18 are closed, the water pump 21 is opened, the antifreeze solution is heated by the PTC auxiliary heater 9, and then flows through the battery system assembly 11 to heat the battery;

[0100] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the present application.

Claims

1. A battery thermal management system, characterized by: Comprise: Compressor (1), condenser (3), first throttling device (4), evaporator (5), heat exchanger (7) and battery system assembly (11), the compressor (1), the condenser (3), the first throttling device (4), the evaporator (5) and the heat exchanger (7) are arranged in refrigerant circulation loop, the heat exchanger (7) and the battery system assembly (11) are arranged in antifreeze circulation loop, the refrigerant circulation loop and the antifreeze circulation loop can be heat exchanged at the heat exchanger (7), the battery thermal management system further comprises condensate water pipeline (100), one end of the condensate water pipeline (100) is communicated with the bottom of the evaporator (5) to guide out the condensate water generated by the evaporator (5), the other end is communicated with the condenser (3), so that the refrigerant and the condensate water are heat exchanged in the condenser (3); A plurality of condensate water flow channels (301) and a plurality of first refrigerant flow channels (302) are arranged in the condenser (3) from one end to the other end, and the condensate water flow channels (301) and the first refrigerant flow channels (302) are arranged alternately, at least one first refrigerant flow channel (302) is arranged between adjacent two condensate water flow channels (301), and at least one condensate water flow channel (301) is arranged between adjacent two first refrigerant flow channels (302); A plurality of antifreeze flow channels (71) are arranged in the heat exchanger (7) from one end to the other end; Further comprising motor electronic control system assembly (10), engine system assembly (12), first pipeline (101), second pipeline (102), third pipeline (103), fourth pipeline (104), fifth pipeline (105) and sixth pipeline (106) and PTC auxiliary heating (9), one end of the battery system assembly (11) is communicated with one end of the motor electronic control system assembly (10) through the first pipeline (101), the other end of the battery system assembly (11) is communicated with one end of the engine system assembly (12) through the second pipeline (102), the other end of the motor electronic control system assembly (10) is communicated with the antifreeze flow channel (71) of the heat exchanger (7) through the third pipeline (103), the other end of the engine system assembly (12) is communicated with the antifreeze flow channel (71) of the heat exchanger (7) through the fourth pipeline (104), one end of the fifth pipeline (105) is communicated with the first pipeline (101), and the other end is communicated with the third pipeline (103), one end of the sixth pipeline (106) is communicated with the second pipeline (102), and the other end is communicated with the fourth pipeline (104); The PTC auxiliary heating (9) is arranged on the fifth pipeline (105).

2. The battery thermal management system according to claim 1, wherein: The condenser (3) is provided with a condensate water inlet (25) and a condensate water outlet (24), one end of the condensate water inlet (25) is communicated with the condensate water pipeline (100), the other end is communicated with the condensate water flow channel (301), the condensate water outlet (24) is communicated with the condensate water flow channel (301), so that the condensate water in the condensate water flow channel (301) after heat exchange can be discharged; The condenser (3) is provided with a condenser refrigerant inlet (26) and a condenser refrigerant outlet (27), one end of the condenser refrigerant inlet (26) is communicated with the external refrigerant pipeline, the other end is communicated with the first refrigerant flow channel (302), one end of the condenser refrigerant outlet (27) is communicated with the first refrigerant flow channel (302), the other end is communicated with the external refrigerant pipeline, so that the refrigerant after heat exchange can be discharged.

3. The battery thermal management system of claim 1, wherein: The refrigerant pipeline between the heat exchanger (7) and the suction port of the compressor (1) is further provided with a first control valve (17), the battery thermal management system further comprises a bypass pipeline (200) and a three-way valve (19), one end of the bypass pipeline (200) is communicated to the refrigerant pipeline between the first control valve (17) and the suction port of the compressor (1), the other end is communicated to the refrigerant pipeline between the heat exchanger (7) and the evaporator (5), the three-way valve (19) is arranged at the intersection of the refrigerant pipeline between the heat exchanger (7) and the evaporator (5) and the bypass pipeline (200).

4. The battery thermal management system of claim 3, wherein: The condensate water pipeline (100) is further provided with a filter device (23); the inside of the evaporator (5) is further provided with an electric heater (6), which can heat the condensate water to evaporate.

5. The battery thermal management system of claim 1, wherein: A plurality of second refrigerant flow channels (72) are arranged in the heat exchanger (7) from one end to the other end, and the antifreeze flow channel (71) and the second refrigerant flow channel (72) are arranged alternately, at least one second refrigerant flow channel (72) is arranged between adjacent two antifreeze flow channels (71), and at least one antifreeze flow channel (71) is arranged between adjacent two second refrigerant flow channels (72).

6. The battery thermal management system of claim 5, wherein: The heat exchanger (7) is provided with a heat exchanger antifreeze inlet (29) and a heat exchanger antifreeze outlet (31), one end of the heat exchanger antifreeze inlet (29) is communicated with the antifreeze pipeline, the other end is communicated with the antifreeze flow channel (71), one end of the heat exchanger antifreeze outlet (31) is communicated with the antifreeze flow channel (71), the other end is communicated with the antifreeze pipeline, so that the antifreeze in the antifreeze flow channel (71) after heat exchange can be discharged; The heat exchanger (7) is provided with a heat exchanger refrigerant inlet (28) and a heat exchanger refrigerant outlet (30), one end of the heat exchanger refrigerant inlet (28) is in communication with the external refrigerant pipeline, the other end is in communication with the second refrigerant flow channel (72), one end of the heat exchanger refrigerant outlet (30) is in communication with the second refrigerant flow channel (72), the other end is in communication with the external refrigerant pipeline, so that the refrigerant after heat exchange can be discharged.

7. The battery thermal management system of claim 1, wherein: Further comprising a second control valve (16), a third control valve (18), a one-way valve (20) and a water pump (21), the second control valve (16) is arranged on the third pipeline (103) and located between the motor electronic control system assembly (10) and the fifth pipeline (105), the third control valve (18) is arranged on the second pipeline (102) and located between the sixth pipeline (106) and the engine system assembly (12), the one-way valve (20) is arranged on the third pipeline (103) and located between the fifth pipeline (105) and the heat exchanger (7), and the one-way valve (20) only allows fluid to flow outwards from the heat exchanger (7), the water pump (21) is arranged on the fourth pipeline (104) and located between the sixth pipeline (106) and the heat exchanger (7).

8. The battery thermal management system of claim 1, wherein: Further comprising a second throttling device (14), a third throttling device (15), a seventh pipeline (107), an eighth pipeline (108) and a water tank (13), one end of the seventh pipeline (107) is in communication with the third pipeline (103), the other end of the seventh pipeline (107) is in communication with one end of the water tank (13), one end of the eighth pipeline (108) is in communication with the fourth pipeline (104), the other end of the eighth pipeline (108) is in communication with the other end of the water tank (13), the second throttling device (14) is arranged on the seventh pipeline (107), and the third throttling device (15) is arranged on the eighth pipeline (108).

9. The battery thermal management system of any one of claims 1-8, wherein: Further comprising a fan (8) and a gas-liquid separator (2), the fan (8) is arranged at the heat exchanger (7) to provide air flow for heat exchange of the heat exchanger (7), and the gas-liquid separator (2) is arranged at a suction port of the compressor (1); Further comprising a solar panel assembly (22) and an energy storage battery (32), the solar panel assembly (22) is electrically connected with the energy storage battery (32), and the energy storage battery (32) is electrically connected with the fan (8).

10. A method of controlling a battery thermal management system as claimed in any one of claims 1 to 9, characterized by: When the battery thermal management system comprises an electric heater (6): The control method comprises: A judging step of judging whether a refrigeration mode is started in the vehicle; A control step of controlling the compressor to start if the refrigeration mode is started in the vehicle, and controlling the compressor to stop and the electric heater (6) to open if a heating mode is started in the vehicle.

11. The control method according to claim 10, wherein: when the battery thermal management system comprises a three-way valve (19): a detecting step of detecting a temperature of the battery system assembly; the determining step of determining whether the temperature of the battery system assembly is higher than a first preset temperature; the controlling step of controlling the three-way valve (19) to make the heat exchanger (7) communicate with the evaporator (5) and controlling the compressor to start when the temperature of the battery system assembly is higher than the first preset temperature.

12. The control method according to claim 11, wherein: when the battery thermal management system further comprises a second control valve (16) and a third control valve (18): the detecting step of further detecting a temperature of the motor electronic control system assembly and detecting a temperature of the engine system assembly; the determining step of determining whether the temperature of the motor electronic control system assembly is higher than a second preset temperature and determining whether the temperature of the engine system assembly is higher than a third preset temperature; the controlling step of controlling the second control valve (16) to open when the temperature of the motor electronic control system assembly is higher than the second preset temperature and controlling the third control valve (18) to open when the temperature of the engine system assembly is higher than the third preset temperature.

13. The control method according to claim 12, wherein: the determining step of determining whether the temperature of the battery system assembly is lower than a fourth preset temperature; the controlling step of controlling the three-way valve (19) to make the heat exchanger (7) not communicate with the evaporator (5), controlling the second control valve (16) to open and the third control valve (18) to open, and controlling the compressor to close when the temperature of the battery system assembly is lower than the fourth preset temperature.

14. The control method according to claim 13, wherein: when the battery thermal management system further comprises a PTC auxiliary heater (9): the determining step of determining whether the temperature of the battery system assembly is lower than a fifth preset temperature, wherein the fifth preset temperature is less than the fourth preset temperature; the controlling step of further controlling the PTC auxiliary heater (9) to start when the temperature of the battery system assembly is lower than the fifth preset temperature.

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