Battery Thermal Management System

Abstract

The present invention belongs to the field of electric vehicles and (or) energy storage technology, and relates to a battery thermal management system, comprising a compressor, a liquid-cooled condenser, a throttling device, a battery heat exchanger, an electronic fan, a first four-way valve, a second four-way valve, a first water pump, and a second water pump. A radiator is arranged outdoors, the electronic fan is arranged on the radiator, and the battery is arranged in a battery pack; the compressor, the liquid-cooled condenser, the throttling device, the battery heat exchanger and the compressor are connected in sequence to form a refrigerant circulation loop; the four ports of the first four-way valve are respectively connected to the coolant outlet of the battery pack, the coolant inlet of the liquid-cooled condenser, the coolant inlet of the battery heat exchanger and the coolant outlet of the radiator; the four ports of the second four-way valve are respectively connected to the coolant outlet of the liquid-cooled condenser, the inlet of the first water pump, the inlet of the second water pump and the coolant outlet of the battery heat exchanger; the outlet of the first water pump is connected to the coolant inlet of the radiator, and the outlet of the second water pump is connected to the coolant inlet of the battery pack.

Description

Technical Field

[0001] The present invention belongs to the field of electric vehicles and (or) energy storage technology, and in particular relates to a battery thermal management system. Background Art

[0002] The battery thermal management of electric vehicles or energy storage that currently use heat pump systems has two basic working modes, namely heat pump mode and cooling mode. In heat pump mode, the refrigerant absorbs heat from the external environment through an outdoor heat exchanger and then exchanges the heat to the coolant through a liquid-cooled condenser, and finally provides the heat to the battery pack; in cooling mode, the battery pack transfers heat to the refrigerant in the battery heat exchanger through the coolant, and the refrigerant then releases the heat to the external environment through the outdoor heat exchanger. The heat pump mode and cooling mode of battery thermal management ensure the operating temperature of the battery, thereby ensuring the efficiency and service life of battery charging and discharging.

[0003] The existing battery thermal management of electric vehicles or energy storage using heat pump systems has the following defects and shortcomings: 1. The outdoor heat exchanger (or condenser) is prone to frost in heat pump mode, which reduces the heating efficiency of the system, affects battery operation, and damages battery life; 2. The battery thermal management system has many components, and the coolant and refrigerant pipelines are numerous and complex, occupying a large space; 3. The cost is high and the process is cumbersome. Summary of the invention

[0004] In order to solve the problems of low heating efficiency of battery thermal management systems in the prior art and multiple and complex pipelines for coolant and refrigerant, the present invention provides a battery thermal management system.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a battery thermal management system, including a compressor, a liquid-cooled condenser, a throttling device, a battery heat exchanger, an electronic fan, a radiator, a first four-way valve, a second four-way valve, a first water pump and a second water pump, wherein the battery is arranged in a battery pack, the radiator is arranged outdoors, and the electronic fan is arranged on the radiator; the compressor, the liquid-cooled condenser, the throttling device, the battery heat exchanger and the compressor are sequentially connected to form a refrigerant circulation loop;

[0006] The four ports of the first four-way valve are respectively connected to the coolant outlet of the battery pack, the coolant inlet of the liquid-cooled condenser, the coolant inlet of the battery heat exchanger and the coolant outlet of the radiator; the four ports of the second four-way valve are respectively connected to the coolant outlet of the liquid-cooled condenser, the inlet of the first water pump, the inlet of the second water pump and the coolant outlet of the battery heat exchanger; the outlet of the first water pump is connected to the coolant inlet of the radiator, and the outlet of the second water pump is connected to the coolant inlet of the battery pack.

[0007] Preferably, the battery thermal management system further comprises a refrigerant flow channel plate and a coolant flow channel plate, wherein the refrigerant flow channel plate is used to connect the refrigerant outlet of the liquid-cooled condenser with the inlet of the throttling device, and the outlet of the throttling device with the refrigerant inlet of the battery heat exchanger, and the liquid-cooled condenser, the throttling device and the battery heat exchanger are integrated and assembled on the refrigerant flow channel plate; the coolant flow channel plate is used to connect the two ports corresponding to the first four-way valve with the coolant inlet of the liquid-cooled condenser and the coolant inlet of the battery heat exchanger, respectively, and the four ports of the second four-way valve are respectively connected with the coolant outlet of the liquid-cooled condenser, the inlet of the first water pump, the inlet of the second water pump and the coolant outlet of the battery heat exchanger, and the first water pump, the second water pump, the first four-way valve and the second four-way valve are integrated and assembled on the coolant flow channel plate. Both the refrigerant side and the coolant side adopt an integrated structure, and the integrated structure layout is reasonable and compact, eliminating the pipes connecting the integrated parts, saving space, and facilitating production and assembly, reducing costs.

[0008] Preferably, the air outlet of the compressor is connected to the refrigerant inlet of the liquid-cooled condenser through a refrigerant pipe, and the refrigerant outlet of the battery heat exchanger is connected to the air inlet of the compressor through a refrigerant pipe; the coolant inlet of the radiator is connected to the outlet of the first water pump through a water pipe or through the coolant flow channel plate, the coolant outlet of the radiator is connected to the inlet of the first four-way valve through a water pipe or through the coolant flow channel plate, the coolant outlet of the battery pack is connected to the inlet of the first four-way valve through a water pipe, and the coolant inlet of the battery pack is connected to the outlet of the second water pump through a water pipe. The connection method of the compressor, radiator and battery pack in the battery thermal management system is simple and reliable, which is convenient for the assembly of the battery thermal management system and has low cost.

[0009] Preferably, a gas-liquid separator can be arranged between the battery heat exchanger and the compressor, the inlet of the gas-liquid separator is connected to the refrigerant outlet of the battery heat exchanger through the refrigerant flow channel plate, the outlet of the gas-liquid separator is connected to the inlet of the compressor through the refrigerant pipe, and the liquid-cooled condenser, throttling device, battery heat exchanger and gas-liquid separator are integrated and assembled on the refrigerant flow channel plate. The gas-liquid separator filters out the liquid in the refrigerant gas to ensure that the refrigerant entering the compressor is gaseous, and prevents liquid refrigerant from entering the compressor to cause liquid shock damage to the compressor, so as to protect the compressor and ensure the compression effect of the refrigerant gas.

[0010] Preferably, a liquid storage tank can be arranged between the liquid-cooled condenser and the throttling device, the inlet of the liquid storage tank is connected to the refrigerant outlet of the liquid-cooled condenser through the refrigerant flow channel plate, the outlet of the liquid storage tank is connected to the inlet of the throttling device through the refrigerant flow channel plate, and the liquid storage tank is also integrated and assembled on the refrigerant flow channel plate. It is ensured that the refrigerant entering the throttling device is in liquid state, and the refrigerant in the gas-liquid mixed state is prevented from generating bubbles when entering the throttling device, blocking the inlet of the throttling device, reducing efficiency and generating noise.

[0011] Preferably, a proportional three-way valve can be arranged between the coolant outlet of the liquid-cooled condenser and the second four-way valve, the coolant outlet of the liquid-cooled condenser is connected to the inlet of the proportional three-way valve, the first outlet of the proportional three-way valve is connected to the second four-way valve, and the second outlet of the proportional three-way valve is connected to the coolant inlet of the battery heat exchanger. When the refrigerant temperature in the battery heat exchanger is similar to or higher than the outside ambient temperature, the battery heat exchanger has no way to absorb heat from the outside through the evaporation of the refrigerant, and the battery thermal management system cannot realize the heat pump mode, then the system heating can be realized through the proportional three-way valve, and the operating conditions are as follows: the proportional three-way valve is opened to the valve port of the battery heat exchanger, and a part of the heated coolant directly enters the battery heat exchanger, so that the refrigerant in the battery heat exchanger can absorb the heat of this part of the coolant, and the superheat is adjusted to ensure that the refrigerant coming out of the battery heat exchanger is gaseous. In this mode, all the heat comes from the compressor, so the efficiency of the whole system will be relatively low, but it is conducive to adapting to extremely cold conditions.

[0012] Furthermore, the liquid-cooled condenser is a water-cooled condenser, and the radiator is a fin radiator. The water-cooled condenser is selected to ensure the heat exchange effect between the coolant and the refrigerant, and the fin radiator is selected to ensure the heat exchange effect between the battery thermal management system and the outdoor heat.

[0013] Furthermore, the first four-way valve and the second four-way valve are both electronic four-way valves, and the compressor is an electric compressor, so as to facilitate the control and regulation of the cooling mode, heating mode and natural wind cooling mode of the battery thermal management system.

[0014] Beneficial effects:

[0015] 1. The battery thermal management system of the present invention transfers the task of the refrigerant in the heat pump system commonly used in electric vehicles to absorb heat from the external environment through the outdoor heat exchanger to the coolant in the radiator, and the coolant then exchanges heat with the refrigerant through the liquid-cooled condenser, which greatly reduces the use of refrigerant in the system, reduces costs, and reduces the time for refrigerant filling;

[0016] 2. The battery thermal management system of the present invention uses the coolant to absorb heat from the outside through the radiator in the heating mode, which greatly reduces the occurrence of frosting; ensures the normal use of the battery under the working conditions of low external ambient temperature and high humidity, and improves the service life of the battery;

[0017] 3. The battery thermal management system of the present invention adopts an integrated structure on both the refrigerant side and the coolant side, eliminating the pipes connecting the integrated parts, saving space and facilitating production and assembly;

[0018] 4. The battery thermal management system of the present invention can enter the natural air cooling mode when the ambient temperature is not high but the battery pack needs to be cooled. The refrigerant side does not work, and the battery pack is cooled by air-cooling the radiator coolant. In spring and autumn, the working time of the compressor is greatly reduced, the life of the compressor is increased, energy loss is reduced, and the product use cost is reduced;

[0019] 5. The battery thermal management system of the present invention can realize the conversion among the cooling mode, heating mode and natural wind cooling mode of the battery thermal management system by controlling the first four-way valve and the second four-way valve, which is convenient, intelligent and has a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the principle of the cooling mode of the embodiment 1 of the battery thermal management system of the present invention;

[0022] Figure 2 Schematic diagram of the heating mode of the battery thermal management system of the present invention;

[0023] Figure 3 Schematic diagram of the principle of the natural wind cooling mode of the embodiment 1 of the battery thermal management system of the present invention;

[0024] Figure 4 It is a schematic diagram of the principle of the cooling mode of the embodiment 2 of the battery thermal management system of the present invention;

[0025] Figure 5 Schematic diagram of the heating mode of the second embodiment of the battery thermal management system of the present invention;

[0026] Figure 6 Schematic diagram of the principle of the natural wind cooling mode of the second embodiment of the battery thermal management system of the present invention;

[0027] Figure 7 Schematic diagram of the cooling mode of the third embodiment of the battery thermal management system of the present invention;

[0028] Figure 8 Schematic diagram of the heating mode of the third embodiment of the battery thermal management system of the present invention;

[0029] Fig. 9 Schematic diagram of the principle of the natural wind cooling mode of the third embodiment of the battery thermal management system of the present invention;

[0030] Fig.10 1 is a schematic diagram of the principle of the first heating mode of the fourth embodiment of the battery thermal management system of the present invention;

[0031] Fig.11 1 is a schematic diagram of the principle of the second heating mode of the fourth embodiment of the battery thermal management system of the present invention;

[0032] Fig.12 1 is a schematic diagram of the principle of the third heating mode of the fourth embodiment of the battery thermal management system of the present invention;

[0033] In the figure: 1. compressor, 2. liquid-cooled condenser, 3. throttling device, 4. battery heat exchanger, 5. electronic fan, 6. radiator, 7. first four-way valve, 8. second four-way valve, 9. first water pump, 10. second water pump, 11. battery pack, 12. refrigerant pipe, 13. water pipe, 14. gas-liquid separator, 15. liquid storage tank, 16. proportional three-way valve. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figures 1 to 3As shown, a battery thermal management system includes a compressor 1, a liquid-cooled condenser 2, a throttling device 3, a battery heat exchanger 4, an electronic fan 5, a radiator 6, a first four-way valve 7, a second four-way valve 8, a first water pump 9 and a second water pump 10. The battery is arranged in a battery pack 11, and the radiator 6 is arranged outdoors. The radiator 6 can also be arranged indoors. The radiator 6 of this embodiment is a fin radiator, and the electronic fan 5 is arranged on the radiator 6; the compressor 1, the liquid-cooled condenser 2, the throttling device 3, the battery heat exchanger 4 and the compressor 1 are connected in sequence to form a refrigerant circulation loop. The compressor 1 of this embodiment is an electric compressor, and the liquid-cooled condenser 2 of this embodiment is a water-cooled condenser. The throttling device 3 of this embodiment can be an electronic expansion valve or a thermal expansion valve, etc.; the four ports of the first four-way valve 7 are respectively connected to the coolant outlet of the battery pack 11, the coolant inlet of the liquid-cooled condenser 2, the coolant inlet of the battery heat exchanger 4 and the coolant outlet of the radiator 6; the four ports of the second four-way valve 8 are respectively connected to the coolant outlet of the liquid-cooled condenser 2, the inlet of the first water pump 9, the inlet of the second water pump 10 and the coolant outlet of the battery heat exchanger 4. The first four-way valve 7 and the second four-way valve 8 of this embodiment are both electronic four-way valves; the outlet of the first water pump 9 is connected to the coolant inlet of the radiator 6, and the outlet of the second water pump 10 is connected to the coolant inlet of the battery pack 11.

[0037] For ease of description and understanding, in this embodiment, the four ports of the first four-way valve 7 are respectively A, B, C and D. The A port of the first four-way valve 7 is connected to the coolant inlet of the battery heat exchanger 4, the B port of the first four-way valve 7 is connected to the coolant outlet of the radiator 6, the C port of the first four-way valve 7 is connected to the coolant outlet of the battery pack 11, and the D port of the first four-way valve 7 is connected to the coolant inlet of the liquid-cooled condenser 2; the four ports of the second four-way valve 8 are respectively A, B, C and D. The A port of the second four-way valve 8 is connected to the coolant outlet of the battery heat exchanger 4, the B port of the second four-way valve 8 is connected to the inlet of the first water pump 9, the C port of the second four-way valve 8 is connected to the inlet of the second water pump 10, and the D port of the second four-way valve 8 is connected to the coolant outlet of the liquid-cooled condenser 2.

[0038] In order to improve the integration of the battery thermal management system, save space, facilitate assembly, and ensure the reliability and stability of the overall structure, in this embodiment, the battery thermal management system also includes a refrigerant flow channel plate and a coolant flow channel plate, the refrigerant flow channel plate is used to connect the refrigerant outlet of the liquid-cooled condenser 2 with the inlet of the throttling device 3, and the outlet of the throttling device 3 is connected to the refrigerant inlet of the battery heat exchanger 4, the liquid-cooled condenser 2, the throttling device 3 and the battery heat exchanger 4 are integrated and assembled on the refrigerant flow channel plate (illustrated in the figure), that is, the refrigerant side adopts an integrated Structure; the coolant flow channel plate is used to connect the two ports corresponding to the first four-way valve 7 to the coolant inlet of the liquid-cooled condenser 2 and the coolant inlet of the battery heat exchanger 4, respectively, and the four ports of the second four-way valve 8 are respectively connected to the coolant outlet of the liquid-cooled condenser 2, the inlet of the first water pump 9, the inlet of the second water pump 10 and the coolant outlet of the battery heat exchanger 4. The first water pump 9, the second water pump 10, the first four-way valve 7 and the second four-way valve 8 are integrated and assembled on the coolant flow channel plate (schematically shown in the figure), that is, the coolant side adopts an integrated structure.

[0039] In order to facilitate the connection of the compressor 1, the radiator 6 and the battery pack 11 to the battery thermal management system, and to ensure the reliability and stability of the installation, in the present embodiment, the air outlet of the compressor 1 is connected to the refrigerant inlet of the liquid-cooled condenser 2 through the refrigerant pipe 12, and the refrigerant outlet of the battery heat exchanger 4 is connected to the air inlet of the compressor 1 through the refrigerant pipe 12; the coolant inlet of the radiator 6 is connected to the outlet of the first water pump 9 through the water pipe 13, and the coolant outlet of the radiator 6 is connected to the inlet of the first four-way valve 7 through the water pipe 13, and the coolant outlet of the battery pack 11 is connected to the inlet of the first four-way valve 7 through the water pipe 13, and the coolant inlet of the battery pack 11 is connected to the outlet of the second water pump 10 through the water pipe 13.

[0040] In order to ensure the working environment temperature of the battery, in this embodiment, when the external environment temperature is high (for example: 20°C-40°C), the battery thermal management system operates in a cooling mode, such as Figure 1 As shown; when the ambient temperature is low (e.g. -30°C-5°C), the battery thermal management system operates in heating mode, such as Figure 2 As shown; when the ambient temperature is suitable (for example: 5℃-20℃), the battery thermal management system operates in natural air cooling mode, such as Figure 3 When the ambient temperature is not high but the battery pack 11 needs cooling, the battery thermal management system can enter the natural air cooling mode, the refrigerant side does not work, and the battery pack 11 is cooled by the air-cooled radiator 6 coolant, which greatly reduces the working time of the compressor 1 in spring and autumn, increases the life of the compressor 1, reduces energy loss, and reduces the cost of product use.

[0041] The operation mode of the battery thermal management system is as follows:

[0042] Cooling mode (when the ambient temperature is high, such as 20-40°C): When the battery pack 11 has a cooling demand, the battery thermal management system enters the cooling mode. The system operating conditions are as follows: the first four-way valve 7 and the second four-way valve 8 operate to Figure 1 In the position shown, the refrigerant (low-temperature, low-pressure gas) is pressurized by the compressor 1 (the refrigerant is a high-temperature, high-pressure gas) and enters the liquid-cooled condenser 2. After transferring the heat to the coolant of the liquid-cooled condenser 2, the refrigerant (high-temperature, high-pressure liquid) flows into the throttling device 3 for throttling and pressure reduction (the refrigerant is a low-temperature, low-pressure gas-liquid two-phase mixture), and then enters the battery heat exchanger 4 to absorb the heat of the coolant of the battery heat exchanger 4. The refrigerant (the refrigerant is a low-temperature, low-pressure gas) enters the compressor 1 again and is pressurized, thereby completing the circulation on the refrigerant side; the coolant heated in the liquid-cooled condenser 2 enters the first water pump 9 through the D port and the B port of the second four-way valve 8, and enters the radiator 6 through the first water pump 9, and the medium-temperature coolant The cooling liquid transfers heat to the outside air through the flat tubes and fins of the radiator 6 and the electronic fan 5. The cooled cooling liquid then enters the liquid cooling condenser 2 through the B port and the D port of the first four-way valve 7 to absorb heat. In this way, the cooling liquid completes the task of heat dissipation in the external environment. The cooling liquid cooled in the battery heat exchanger 4 enters the second water pump 10 through the A port and the C port of the second four-way valve 8, and then flows into the battery pack 11 through the second water pump 10 to dissipate heat for the battery pack 11. After absorbing heat, the cooling liquid flows out of the battery pack 11, flows through the C port and the A port of the first four-way valve 7, enters the battery heat exchanger 4 to be cooled by the refrigerant, and in this way, the cooling liquid completes the task of heat dissipation for the battery pack 11.

[0043] Heating mode (when the ambient temperature is low, such as -30-5°C): When the battery pack 11 needs to be heated, the battery thermal management system enters the heat pump mode. The system operates as follows: the first four-way valve 7 and the second four-way valve 8 operate to Figure 2The position shown, the circulation on the refrigerant side is the same as the above-mentioned refrigeration mode, and will not be repeated; the circulation on the coolant side is as follows: the coolant that absorbs heat in the liquid-cooled condenser 2 enters the second water pump 10 through the D port and the C port of the second four-way valve 8, and flows into the battery pack 11 through the second water pump 10 to heat the battery pack 11. The coolant after releasing the heat enters the liquid-cooled condenser 2 from the battery pack 11 through the C port and the D port of the first four-way valve 7 to absorb heat, so that the coolant completes the task of heating the battery pack 11; the coolant cooled in the battery heat exchanger 4 flows into the first water pump 9 through the A port and the B port of the second four-way valve 8, and then enters the radiator 6 through the first water pump 9. The low-temperature coolant absorbs heat from the outside air through the flat tubes and fins in the radiator 6 and the electronic fan 5. The coolant after absorbing the heat then enters the battery heat exchanger 4 through the B port and the A port of the first four-way valve 7 to transfer the heat to the refrigerant, so that the coolant completes the task of absorbing heat from the external environment;

[0044] Natural air cooling mode (when the ambient temperature is suitable, for example, 5-20°C): When the battery pack 11 has a heat dissipation requirement and the ambient temperature is low, the battery thermal management system enters the natural air cooling mode, and the first four-way valve 7 and the second four-way valve 8 operate to Figure 3 Position, the refrigerant side does not work; the medium-temperature coolant flowing out of the battery pack 11 flows through the C port and A port of the first four-way valve 7 and then enters the battery heat exchanger 4, and then flows through the A port and B port of the second four-way valve 8 and then enters the radiator 6 through the first water pump 9. The medium-temperature coolant transfers heat to the outside air through the flat tubes and fins in the radiator 6 and the electronic fan 5. The cooled coolant flows into the liquid-cooled condenser 2 through the B port and D port of the first four-way valve 7, and then enters the second water pump 10 through the D port and C port of the second four-way valve 8 and finally flows into the battery pack 11. The coolant absorbs heat from the battery pack 11 and then flows out, thus completing the task of cooling the battery.

[0045] Example 2

[0046] like Figures 4 to 6 As shown, in this embodiment, the difference from embodiment 1 is that a gas-liquid separator 14 is provided between the battery heat exchanger 4 and the compressor 1, the inlet of the gas-liquid separator 14 is connected to the refrigerant outlet of the battery heat exchanger 4 through the refrigerant flow channel plate, the outlet of the gas-liquid separator 14 is connected to the inlet of the compressor 1 through the refrigerant pipe 12, and the liquid-cooled condenser 2, throttling device 3, battery heat exchanger 4 and gas-liquid separator 14 are integrated and assembled on the refrigerant flow channel plate (schematically shown in the figure). The gas-liquid separator filters out the liquid in the refrigerant gas to ensure that the refrigerant entering the compressor is gaseous, and prevents liquid refrigerant from entering the compressor to cause liquid shock damage to the compressor, so as to protect the compressor and ensure the compression effect of the refrigerant gas.

[0047] Example 3

[0048] like Figures 7 to 9 As shown, in this embodiment, the difference from embodiment 1 is that a liquid storage tank 15 is provided between the liquid-cooled condenser 2 and the throttling device 3, the inlet of the liquid storage tank 15 is connected to the refrigerant outlet of the liquid-cooled condenser 2 through the refrigerant flow channel plate, the outlet of the liquid storage tank 15 is connected to the inlet of the throttling device 3 through the refrigerant flow channel plate, and the liquid storage tank 15 is also integrated and assembled on the refrigerant flow channel plate (illustrated in the figure). It is ensured that the refrigerant entering the throttling device is in liquid state, and the refrigerant in the gas-liquid mixed state is prevented from generating bubbles when entering the throttling device to block the inlet of the throttling device, thereby reducing efficiency and generating noise.

[0049] Example 4

[0050] like Figures 10-12 As shown, in this embodiment, the difference from Embodiment 1, 2 or 3 is that a proportional three-way valve 16 is arranged between the coolant outlet of the liquid-cooled condenser 2 and the second four-way valve 8, the coolant outlet of the liquid-cooled condenser 2 is connected to the inlet of the proportional three-way valve 16, the first outlet of the proportional three-way valve 16 is connected to the second four-way valve 8, and the second outlet of the proportional three-way valve 16 is connected to the coolant inlet of the battery heat exchanger 4. The function of the proportional three-way valve 16 is to allow water to enter at one end and exit at both ends, and the water output at both ends can be adjusted. Under extremely cold conditions (for example, ambient temperature ≤-30°C), since the refrigerant temperature is similar to or higher than the external ambient temperature, the battery heat exchanger 4 cannot absorb heat from the outside through refrigerant evaporation, and the battery thermal management system cannot achieve heating effect through the heat pump mode. The proportional three-way valve 16 can be used to achieve system heating, and the operating conditions are as follows: the proportional three-way valve 16 opens the coolant inlet of the battery heat exchanger 4, and a part of the heated coolant directly enters the battery heat exchanger 4, so that the refrigerant in the battery heat exchanger 4 can absorb the heat of this part of the coolant, and by adjusting the superheat, it is ensured that the refrigerant coming out of the battery heat exchanger 4 is gaseous. In this mode, all the heat comes from the compressor 1, and the efficiency of the entire system is relatively low, but it is ensured to adapt to extremely cold conditions.

[0051] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery thermal management system, characterized in that: The invention comprises a compressor (1), a liquid-cooled condenser (2), a throttling device (3), a battery heat exchanger (4), an electronic fan (5), a radiator (6), a first four-way valve (7), a second four-way valve (8), a first water pump (9) and a second water pump (10), wherein the battery is arranged in a battery pack (11), the radiator (6) is arranged outdoors, and the electronic fan (5) is arranged on the radiator (6); the compressor (1), the liquid-cooled condenser (2), the throttling device (3), the battery heat exchanger (4) and the compressor (1) are connected in sequence to form a refrigerant circulation loop; The four ports of the first four-way valve (7) are respectively connected to the coolant outlet of the battery pack (11), the coolant inlet of the liquid-cooled condenser (2), the coolant inlet of the battery heat exchanger (4) and the coolant outlet of the radiator (6); the four ports of the second four-way valve (8) are respectively connected to the coolant outlet of the liquid-cooled condenser (2), the inlet of the first water pump (9), the inlet of the second water pump (10) and the coolant outlet of the battery heat exchanger (4); the outlet of the first water pump (9) is connected to the coolant inlet of the radiator (6), and the outlet of the second water pump (10) is connected to the coolant inlet of the battery pack (11); The battery thermal management system further comprises a refrigerant flow channel plate and a coolant flow channel plate, wherein the refrigerant flow channel plate is used to connect the refrigerant outlet of the liquid-cooled condenser (2) with the inlet of the throttling device (3), and the outlet of the throttling device (3) with the refrigerant inlet of the battery heat exchanger (4), and the liquid-cooled condenser (2), the throttling device (3) and the battery heat exchanger (4) are integrated and assembled on the refrigerant flow channel plate; the coolant flow channel plate is used to connect the two ports corresponding to the first four-way valve (7) with the coolant inlet of the liquid-cooled condenser (2) and the coolant inlet of the battery heat exchanger (4), and the four ports of the second four-way valve (8) are respectively connected with the coolant outlet of the liquid-cooled condenser (2), the inlet of the first water pump (9), the inlet of the second water pump (10) and the coolant outlet of the battery heat exchanger (4), and the first water pump (9), the second water pump (10), the first four-way valve (7) and the second four-way valve (8) are integrated and assembled on the coolant flow channel plate; The air outlet of the compressor (1) is connected to the refrigerant inlet of the liquid-cooled condenser (2) through a refrigerant pipe (12), and the refrigerant outlet of the battery heat exchanger (4) is connected to the air inlet of the compressor (1) through a refrigerant pipe (12); the coolant inlet of the radiator (6) is connected to the outlet of the first water pump (9) through a water pipe (13) or through the coolant flow channel plate, the coolant outlet of the radiator (6) is connected to the inlet of the first four-way valve (7) through a water pipe (13) or through the coolant flow channel plate, the coolant outlet of the battery pack (11) is connected to the inlet of the first four-way valve (7) through a water pipe (13), and the coolant inlet of the battery pack (11) is connected to the outlet of the second water pump (10) through a water pipe (13); A gas-liquid separator (14) is provided between the battery heat exchanger (4) and the compressor (1); the inlet of the gas-liquid separator (14) is connected to the refrigerant outlet of the battery heat exchanger (4) via the refrigerant flow channel plate; the outlet of the gas-liquid separator (14) is connected to the inlet of the compressor (1) via the refrigerant pipe (12); the liquid-cooled condenser (2), the throttling device (3), the battery heat exchanger (4) and the gas-liquid separator (14) are integrated and assembled on the refrigerant flow channel plate.

2. The battery thermal management system according to claim 1, characterized in that: A liquid storage tank (15) is provided between the liquid-cooled condenser (2) and the throttling device (3); the inlet of the liquid storage tank (15) is connected to the refrigerant outlet of the liquid-cooled condenser (2) via the refrigerant flow channel plate; the outlet of the liquid storage tank (15) is connected to the inlet of the throttling device (3) via the refrigerant flow channel plate; and the liquid storage tank (15) is also integrated and assembled on the refrigerant flow channel plate.

3. The battery thermal management system according to any one of claims 1 or 2, characterized in that: A proportional three-way valve (16) is provided between the coolant outlet of the liquid-cooled condenser (2) and the second four-way valve (8); the coolant outlet of the liquid-cooled condenser (2) is connected to the inlet of the proportional three-way valve (16); the first outlet of the proportional three-way valve (16) is connected to the second four-way valve (8); and the second outlet of the proportional three-way valve (16) is connected to the coolant inlet of the battery heat exchanger (4).

4. The battery thermal management system according to any one of claims 1 or 2, characterized in that: The liquid-cooled condenser (2) is a water-cooled condenser; and the radiator (6) is a fin radiator.

5. The battery thermal management system according to claim 4, characterized in that: The first four-way valve (7) and the second four-way valve (8) are both electronic four-way valves, and the compressor (1) is an electric compressor.

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