Power battery thermal management equipment and control method thereof

Abstract

The invention discloses power battery thermal management equipment and a control method thereof, relates to the technical field of power battery thermal management, and solves the problem that the overall equipment consumes relatively high energy in some environments with large day and night temperature difference. The invention discloses power battery thermal management equipment and a control method thereof. The power battery thermal management equipment comprises a water pump, one end of the water pump is connected with a water inlet pipe, one side of the surface of the water inlet pipe is connected with a return water temperature sensor, one end of the water pump is connected with a low-temperature radiator, and one end of the low-temperature radiator is connected with a second three-way pipe. A branch pipe is arranged, a fifth stop valve is arranged on the surface of the branch pipe, the water outlet end of a first heater is connected with a third stop valve, and the water inlet end of the first heater is connected with a fourth stop valve; the energy consumed when the temperature of the cooling liquid in the pipeline rises from 10 DEG C to 20 DEG C is much smaller than that consumed when the temperature of the cooling liquid rises from 0 DEG C to 20 DEG C.

Description

Technical Field

[0001] The present invention relates to the field of power battery thermal management, and in particular to a power battery thermal management device and a control method thereof. Background Art

[0002] With the acceleration of electrification in the construction machinery industry, high-power power batteries are the key to ensuring the normal operation of construction machinery products. Battery thermal management technology has become one of the main factors affecting battery energy efficiency. If the thermal management equipment does not cool or heat the battery well, it may cause thermal runaway or battery mileage attenuation, which in turn leads to battery short circuit, bulging, open fire, and ultimately safety accidents. Battery thermal management equipment is the key to ensuring the continuous and safe operation of the entire construction machinery product. The optimal operating temperature range of the battery is usually between 20℃ and 30℃. Within this temperature range, the performance and life of the battery can be better guaranteed.

[0003] The power battery thermal management equipment currently used in the industry is an independent cooling device and an independent heating device that are controlled separately. The control energy efficiency ratio of this distributed structure equipment is not high, which is not conducive to energy-saving control according to the ambient temperature. In some special environments, especially in some environments with large temperature differences between day and night, the existing lithium batteries need to heat the battery temperature from 0°C to 20°C, which consumes a lot of energy. The overall energy consumption of the equipment is relatively high, so it does not meet the existing needs. In this regard, we propose a power battery thermal management device and a control method thereof. Summary of the invention

[0004] The object of the present invention is to provide a power battery thermal management device and a control method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a power battery thermal management device, comprising a water pump, one end of the water pump is connected to a water inlet pipe, one side of the surface of the water inlet pipe is connected to a return water temperature sensor, one end of the water pump is connected to a first three-way pipe, one end of the first three-way pipe is connected to a low-temperature radiator, one end of the low-temperature radiator is connected to a second three-way pipe through a pipeline, one end of the second three-way pipe is connected to a first heater through a pipeline, a water outlet end of the first heater is connected to a heat exchanger through a pipeline, a water outlet end of the surface of the heat exchanger and the first three-way pipe are connected through a pipeline, the other end of the second three-way pipe is connected to a battery, and a water outlet temperature sensor is provided on one side of the battery surface; Another water outlet on the surface of the heat exchanger is connected to a compressor via a pipeline, one end of the compressor is connected to a condenser via a pipeline, and one end of the condenser is connected to one of the water inlets of the heat exchanger via a pipeline.

[0006] Preferably, a low-temperature temperature sensor is provided on the surface of the pipe connecting the compressor and the heat exchanger, and a high-temperature temperature sensor is provided on the surface of the pipe connecting the compressor and the condenser.

[0007] Preferably, an ambient temperature sensor is provided on one side of the low-temperature radiator, a second stop valve is provided on the surface of the pipe between the low-temperature radiator and the first three-way pipe, and a first stop valve is provided on the pipe connecting the first three-way pipe and the heat exchanger.

[0008] Preferably, a condensing fan is provided on the outer side of the condenser, a low-temperature temperature sensor is provided on the surface of the pipe connecting between the compressor and the heat exchanger, and a high-temperature temperature sensor is provided on the surface of the pipe connecting between the compressor and the condenser.

[0009] Preferably, the heat exchanger, the first heater and the low-temperature radiator are connected in series through pipelines to form a water circulation loop.

[0010] Preferably, the heat exchanger, compressor and condenser are connected in series via pipelines to form a refrigerant circulation loop.

[0011] Preferably, a branch pipe is connected to the pipe at the water outlet of the first heater and one end of the second three-way pipe, a fifth stop valve is provided on the surface of the branch pipe, a third stop valve is connected to the water outlet of the first heater, a fourth stop valve is connected to the water inlet of the first heater, a sixth stop valve is connected to the other end of the branch pipe, and a second heater is provided in the middle of the branch pipe; The second heater comprises a water inlet chamber and a heating chamber, a plurality of heating plates are fixedly connected to the four end surfaces of the heating chamber, a partition is fixedly connected between the water inlet chamber and the heating chamber, a gear box is arranged in the middle of the partition, a rotating blade is connected to the connecting shaft on the upper side of the gear box, a rotating rod is connected to the output end on the lower side of the gear box through a coupling, a plurality of connecting rods are fixedly connected to both sides of the rotating rod, a rotating plate is fixedly connected to one side of the connecting rod, and worm wheel blades are connected to both sides of the upper end of the rotating rod; A water inlet is provided at the upper end of one side of the water inlet chamber, and the water inlet is fixedly connected. A liquid hole is provided at the lower end of the other side of the water inlet chamber. A liquid outlet is provided at one side of the bottom end of the heating chamber, and the liquid outlet and the fifth stop valve are connected by a pipeline.

[0012] Preferably, a heat recovery device is connected between the water outlet pipe and the water inlet pipe, and a battery is inserted in the heat recovery device.

[0013] Preferably, the heat recovery device includes a heat-conducting copper sheet fixedly connected to the upper and lower ends of the battery, a plurality of heat-conducting grooves are arranged on the surface of the heat-conducting copper sheet, heat-conducting copper tubes are fitted in the heat-conducting grooves, and both ends of each heat-conducting copper tube are connected to a buffer tank, one end of one of the buffer tanks is connected to a water outlet pipe, and one end of the other water outlet pipe is connected to a water inlet pipe.

[0014] A control method for a power battery thermal management device, the control method comprising the following steps: Step A: When the battery is not heated and does not need to be cooled, the first heater of the water circulation loop and the heat exchanger in the refrigerant circulation loop in the equipment do not work, the first stop valve is opened, and the second stop valve is opened, and the water pump is operated to circulate the coolant to achieve the purpose of maintaining the battery temperature uniformly; Step B: When the battery temperature is higher than 30°C and the ambient temperature is less than 5°C, the device starts low-temperature refrigeration to cool down the battery that is higher than 30°C, opens the second stop valve, closes the first stop valve, and the first heater does not work. The coolant flows through the low-temperature radiator through the operation of the water pump, and the wind generated by the high-speed operation of the condensing fan passes through the condenser and blows to the low-temperature radiator, so that the heat of the coolant is exchanged with the low-temperature environment, and the temperature of the coolant is reduced, thereby achieving the purpose of cooling the battery; Step C: When the battery temperature is higher than 30°C and the ambient temperature is ≥5°C, the device starts high-temperature cooling, opens the first stop valve, closes the second stop valve, the first heater does not work, turns on the compressor to operate the refrigerant circulation loop, and operates the water pump to make the coolant flow through the heat exchanger. The heat exchange between the refrigerant and the coolant is completed in the heat exchanger, and the coolant temperature is reduced to ℃, thereby achieving the purpose of cooling the battery; Step D: When the battery temperature is lower than 10°C and needs to be heated, the device starts heating. The return water temperature sensor and the outlet water temperature sensor detect that the average temperature of the coolant is lower than 10°C. Then the central processor controls to open the first stop valve and close the second stop valve. The water pump is powered by an external power supply and operates to circulate the coolant. At the same time, the first heater is turned on to heat the coolant and heat the coolant temperature to 20°C, thereby achieving the purpose of heating the battery. Step E: When the ambient temperature rises to 30°C during the day, the heat exchanger is not powered on, the second stop valve is closed, the first stop valve is opened, the third stop valve and the fourth stop valve are open, the fifth stop valve and the sixth stop valve are also open, and the first heater is not powered on. The heat generated by the battery during operation will be continuously dissipated to the heat recovery device, and the ambient temperature causes the coolant temperature in the pipeline to rise to 20°C, and the coolant in the second heater is heated to 30°C due to the environment. Step F: When the ambient temperature drops to 10°C at night, the temperature of the coolant inside the first heater is already 10°C. The coolant in the second heater is mixed with the coolant in the first heater and the pipeline, so that the temperature of the coolant is maintained at 20°C.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention comprises a water circulation loop composed of an outlet water temperature sensor, a return water temperature sensor, a water pump, a low-temperature radiator, a water stop valve and a heat exchanger; The refrigerant circulation loop is composed of a compressor, a high-temperature temperature sensor, a low-temperature temperature sensor, a condenser, a first heater, an electronic expansion valve and a heat exchanger. The ambient temperature sensor is used to monitor the ambient temperature. The equipment can automatically control the equipment to switch between multiple working modes such as self-circulation, low-temperature refrigeration, high-temperature refrigeration, and heating according to the ambient temperature.

[0016] 2. In the present invention, when the ambient temperature gradually rises to 30°C during the day, the heat exchanger is not powered on, the second stop valve is closed, the first stop valve is opened, the third stop valve and the fourth stop valve are open, the fifth stop valve and the sixth stop valve are also open, and the first heater is not powered on. At this time, the water pump is powered on to circulate the coolant in the pipeline, and the heat generated by the battery during operation is continuously dissipated to the heat recovery device. At the same time, the second heater uses the ambient temperature to keep the coolant temperature in the pipeline at 30°C; At night, when the low-temperature sensor detects that the ambient temperature has dropped to 10°C, the battery temperature is maintained at 10°C due to the operation of the refrigerant circulation loop during the day, and the coolant in the pipe is also 10°C, the fifth stop valve and the sixth stop valve are first opened to allow the 30°C coolant inside the second heater and the remaining 10°C coolant inside the first heater and its pipes to mix and circulate into the first heater, and the 30°C coolant and the 10°C coolant are mixed to obtain a 20°C coolant. In this setting, the temperature of the environment during the day is used to maintain the temperature of the coolant between 10°C and 20°C, thereby saving the electric energy consumed by the first heater to directly heat the coolant. Therefore, the energy-saving mode of this setting can save the energy consumed by battery heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a piping diagram of the battery thermal management device in the present invention; Figure 2 It is the overall three-dimensional structure diagram of the present invention; Figure 3 A piping diagram after adding a heat recovery device, a third stop valve, a fourth stop valve and a fifth stop valve to the battery thermal management device in the present invention; Figure 4 It is a three-dimensional structural diagram of the whole heat recovery device in the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram of the heat recovery device; Figure 6 A side cutaway view of the second heater in the present invention In the figure: 1. return water temperature sensor; 2. heat recovery device; 201. heat-conducting copper tube; 202. heat-conducting copper sheet; 203. buffer tank; 204. heat-conducting groove; 3. second stop valve; 4. compressor; 5. high temperature sensor; 6. low temperature sensor; 7. condenser; 8. low temperature radiator; 9. ambient temperature sensor; 10. condensing fan; 11. heat exchanger; 12. outlet water temperature sensor; 13. first heater; 14. third stop valve; 15. fourth stop valve; 16. fifth stop valve ; 17. first stop valve; 18. water pump; 19. water outlet pipe; 20. water inlet pipe; 21. battery; 22. first three-way pipe; 23. second three-way pipe; 24. branch pipe; 25. sixth stop valve; 26. second heater; 2601. water inlet chamber; 2602. heating chamber; 2603. rotating blade; 2604. gear box; 2605. heating plate; 2606. worm wheel blade; 2607. connecting rod; 2608. rotating plate; 2609. rotating rod; 2610. liquid hole; 2611. partition. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings 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.

[0019] See also Figures 1 to 6 An embodiment of the present invention is as follows: a power battery thermal management device comprises a water pump 18, one end of the water pump 18 is connected to a water inlet pipe 20, one side of the surface of the water inlet pipe 20 is connected to a return water temperature sensor 1, one end of the water pump 18 is connected to a first three-way pipe 22, one end of the first three-way pipe 22 is connected to a low-temperature radiator 8, one end of the low-temperature radiator 8 is connected to a second three-way pipe 23 through a pipeline, one end of the second three-way pipe 23 is connected to a first heater 13 through a pipeline, a water outlet end of the first heater 13 is connected to a heat exchanger 11 through a pipeline, a water outlet end of the surface of the heat exchanger 11 is connected to the first three-way pipe 22 through a pipeline, the other end of the second three-way pipe 23 is connected to a water outlet pipe 19, and a water outlet temperature sensor 12 is provided on one side of the surface of the water outlet pipe 19.

[0020] Another water outlet on the surface of the heat exchanger 11 is connected to the compressor 4 through a pipe, one end of the compressor 4 is connected to the condenser 7 through a pipe, and one end of the condenser 7 is connected to one of the water inlets of the heat exchanger 11 through a pipe.

[0021] A low-temperature temperature sensor 6 is provided on the surface of the pipe connecting the compressor 4 and the heat exchanger 11, a high-temperature temperature sensor 5 is provided on the surface of the pipe connecting the compressor 4 and the condenser 7, an ambient temperature sensor 9 is provided on one side of the low-temperature radiator 8, a second stop valve 3 is provided on the surface of the pipe between the low-temperature radiator 8 and the first three-way pipe 22, a first stop valve 17 is provided on the pipe connecting the first three-way pipe 22 and the heat exchanger 11, and a condensing fan 10 is provided on the outside of the condenser 7.

[0022] A water circulation loop consisting of an outlet water temperature sensor 12, a return water temperature sensor 1, a water pump 18, a low-temperature radiator 8, a second stop valve 3 and a heat exchanger 11; A refrigerant circulation circuit is formed by a compressor 4 , a high temperature sensor 5 , a low temperature sensor 6 , a condenser 7 , a first heater 13 , a first stop valve 17 and a heat exchanger 11 .

[0023] The high temperature sensor 5 and the low temperature sensor 6 are used to monitor the temperature of the refrigerant in the compressor 4, the return water temperature sensor 1 and the outlet water temperature sensor 12 are used to monitor the temperature of the coolant in the pipeline, the high temperature sensor 5, the low temperature sensor 6, the return water temperature sensor 1 and the outlet water temperature sensor 12 are connected to the central processing unit through a data line, and the central processing unit controls the start and stop of the water pump 18, the heat exchanger 11, the first heater 13 and the condensing fan 10 through electrical signals, and controls the on and off of the second stop valve 3, the first stop valve 17, the third stop valve 14, the fourth stop valve 15, the sixth stop valve 25, and the fifth stop valve 16. The water pump 18, the heat exchanger 11, the first heater 13 and the condensing fan 10 are all powered by an external power supply.

[0024] like Figure 1 As shown, the ambient temperature sensor 9 is used to monitor the ambient temperature. The overall device automatically controls the device to switch between multiple working modes such as self-circulation, low-temperature refrigeration, high-temperature refrigeration, and heating according to the ambient temperature. Except for the second heater 26, all other devices of the overall device are installed indoors. The indoor environment is relatively mild compared to the external environment, and the indoor ambient temperature difference is small; When the battery 21 is not heated and does not need to be cooled, the first heater 13 of the water circulation loop and the heat exchanger 11 in the refrigerant circulation loop in the device are not in operation, the first stop valve 17 is opened, and the second stop valve 3 is opened, and the water pump 18 is operated to circulate the coolant to achieve the purpose of maintaining the battery 21 at a uniform temperature; When the temperature of the battery 21 is higher than 30°C and the ambient temperature is less than 5°C, the device turns on the low-temperature refrigeration to cool the battery 21 higher than 30°C, opens the second stop valve 3, closes the first stop valve 17, and the first heater 13 does not work. At this time, the third stop valve 14 and the fourth stop valve 15 are also closed. The coolant flows through the low-temperature radiator 8 through the operation of the water pump 18. The wind generated by the high-speed operation of the condensing fan 10 blows through the condenser 7 to the low-temperature radiator 8, and the heat of the coolant is heat-exchanged with the low-temperature environment to reduce the temperature of the coolant, thereby achieving the purpose of cooling the battery 21. The return water temperature sensor 1 and the outlet water temperature sensor 12 can monitor the temperature of the coolant at two positions of the pipeline. By monitoring the temperature of the coolant, it is calculated that the average temperature of the coolant is higher than 30°C. If the average temperature of the coolant is higher than 30°C, it reflects that the current temperature of the battery 21 is higher than 30°C. The ambient temperature sensor 9 monitors that the ambient temperature is lower than 5°C. The central processing unit receives the electrical signal of the ambient temperature sensor 9, and then controls the operation of the condensing fan 10. When the temperature of the battery 21 is higher than 30°C and the ambient temperature is ≥5°C, the return water temperature sensor 1 and the outlet water temperature sensor 12 detect that the coolant is higher than 30°C, and the ambient temperature sensor 9 detects that the temperature is greater than 5°C, the device starts high-temperature refrigeration, opens the first stop valve 17, closes the second stop valve 3, and the first heater 13 does not work. The central processor receives the electrical signal of the ambient temperature sensor 9, turns on the compressor 4 to operate the refrigerant circulation loop, and turns off the compressor 4 when the low temperature sensor 6 detects that the temperature of the refrigerant in the compressor 4 is lower than 5°C; when the high temperature sensor 5 detects that the temperature of the refrigerant in the compressor 4 is higher than 20°C, the compressor 4 is turned on; the water pump 18 is operated to make the coolant flow through the heat exchanger 11, and the heat exchange between the refrigerant and the coolant is completed in the heat exchanger 11, and the coolant temperature is reduced to 10°C, thereby achieving the purpose of cooling the battery 21; When the temperature of the battery 21 is lower than 10°C and needs to be heated, the device starts heating, and the return water temperature sensor 1 and the outlet water temperature sensor 12 detect that the average temperature of the coolant is lower than 10°C, then the central processing unit controls the opening of the first stop valve 17 and the closing of the second stop valve 3, and the water pump 18 is powered by an external power supply and operates to allow the coolant to circulate, and at the same time, the first heater 13 is turned on to heat the coolant and heat the coolant temperature to 20°C, thereby achieving the purpose of heating the battery 21.

[0025] A branch pipe 24 is connected to the pipe at the water outlet end of the first heater 13 and one end of the second three-way pipe 23. A fifth stop valve 16 and a sixth stop valve 25 are provided on the surface of the branch pipe 24. A second heater 26 is provided in the middle of the branch pipe 24. The water outlet end of the first heater 13 is connected to the third stop valve 14, the water inlet end of the first heater 13 is connected to the fourth stop valve 15, and a heat recovery device 2 is connected between the water outlet pipe 19 and the water inlet pipe 20.

[0026] The device also has an energy-saving mode for battery heating. The energy-saving mode is generally suitable for environments with large temperature differences between day and night. When the ambient temperature gradually rises to 30°C during the day, the heat exchanger 11 is not powered on, the second stop valve 3 is closed, the first stop valve 17 is opened, the third stop valve 14 and the fourth stop valve 15 are open, the fifth stop valve 16 and the sixth stop valve 25 are also open, and the first heater 13 is not powered on. At this time, the water pump 18 is powered on to circulate the coolant in the pipeline. The heat generated by the battery 21 during operation will be continuously dissipated to the heat recovery device 2. At the same time, the second heater 26 uses the ambient temperature to keep the coolant temperature in the pipeline at 30°C. The second heater 26 includes a water inlet chamber 2601 and a heating chamber 2602. The four end surfaces of the heating chamber 2602 are fixedly connected with a plurality of heating plates 2605. A partition 2611 is fixedly connected between the water inlet chamber 2601 and the heating chamber 2602. A gear box 2604 is arranged in the middle of the partition 2611. A rotating blade 2603 is connected to the connecting shaft on the upper side of the gear box 2604. A rotating rod 2609 is connected to the output end on the lower side of the gear box 2604 through a coupling. The lower end of the rotating rod 2609 is connected to the inner side of the second heater 26. The bottom end is connected by a bearing, a plurality of connecting rods 2607 are fixedly connected to both sides of the rotating rod 2609, a worm wheel blade 2606 is fixedly connected to the upper side of the rotating rod 2609, a rotating plate 2608 is fixedly connected to one side of the connecting rod 2607, a water inlet is provided at the upper end of one side of the water inlet chamber 2601, the water inlet is fixedly connected to the branch pipe 24, a liquid hole 2610 is provided at the lower end of the other side of the water inlet chamber 2601, a liquid outlet is provided at one side of the bottom end of the heating chamber 2602, and the liquid outlet is connected to the fifth stop valve 16 through a pipeline; In the above arrangement of the second heater 26, the coolant enters the water inlet chamber 2601 through the branch pipe 24. After the cold cutting liquid fills the water inlet chamber 2601, it flows into the heating chamber 2602 from the liquid hole 2610. In the process of the coolant flowing in the water inlet chamber 2601, the rotating blade 2603 is continuously rotated. The rotation of the rotating blade 2603 drives the rotation of the gear inside the gear box 2604, and then the output end on the lower side of the gear box 2604 drives the rotating rod 2609 to rotate. The rotating rod 2609 is fixedly connected to the worm wheel blade 2606, and the rotating rod 2609 also drives the worm wheel blade 2606 and the rotating plate 2608 to rotate. The overall second heater 26 is placed outdoors, and the external sunlight and environmental heat during the day will gradually heat the coolant inside the heating chamber 2602, and the sunlight will directly shine on the heating plate 2605, wherein the heating plate 2605 is made of a metal with a low specific heat capacity, and the thermal conductivity of the heating plate 2605 with a low specific heat capacity accelerates the heating efficiency inside the heating chamber 2602, and at the same time, the worm wheel blades 2606 rotate the coolant inside the heating chamber 2602 to form a vortex during the rotation process, and at the same time, the rotating plate 2608 continuously squeezes the coolant to the surrounding areas inside the heating chamber 2602 during the rotation process, thereby increasing the contact area between the coolant and the heating plate 2605, and the contact time between the coolant and the heating plate 2605 is also significantly increased, further improving the heating efficiency of the heating plate 2605 and the coolant.

[0027] When the coolant temperature rises to 10°C, the fifth stop valve 16 and the sixth stop valve 25 are closed, so that the coolant with a temperature of 10°C is stored in the second heater 26. At this time, the first heater 13 is also not powered on, and the third stop valve 14 and the fourth stop valve 15 are open. The heat exchanger 11 is turned on and operated, and the heat exchanger 11 cools the coolant temperature in the pipeline to 10°C, so as to avoid the temperature of the battery 21 being too high due to the high ambient temperature during the day. At the same time, the external environment will heat the 10°C coolant stored in the second heater 26 to 30°C. At night, when the low-temperature sensor 6 detects that the ambient temperature has dropped to 10°C, the temperature of the battery 21 is maintained at 10°C due to the operation of the refrigerant circulation loop during the day, and the coolant in the pipe is also 10°C, then the fifth stop valve 16 and the sixth stop valve 25 are opened first, so that the 30°C coolant inside the second heater 26 and the 10°C coolant remaining inside the first heater 13 and in its pipes are mixed and circulated into the first heater 13, and the 30°C coolant and the 10°C coolant are mixed to obtain a 20°C coolant. In this setting, the temperature of the coolant is maintained between 10°C and 20°C by utilizing the temperature of the environment during the day, thereby saving the electric energy consumed by the first heater 13 to directly heat the coolant. Therefore, the energy-saving mode of this setting can save the energy consumed by heating the battery 21.

[0028] The heat recovery device 2 includes a heat-conducting copper sheet 202 fixedly connected to the upper and lower ends of the battery 21. A plurality of heat-conducting grooves 204 are arranged on the surface of the heat-conducting copper sheet 202. A plurality of heat-conducting copper tubes 201 are fitted and installed in the heat-conducting grooves 204. Buffer tanks 203 are connected to both ends of the heat-conducting copper tubes 201. One end of one buffer tank 203 is connected to the water outlet pipe 19, and one end of the other buffer tank 203 is connected to the water inlet pipe 20. After the heat-conducting copper sheet 202 is heated by the battery 21, the heat is transferred to the heat-conducting copper tube 201. The heat-conducting copper tube 201 heats the coolant inside. The curvature of the heat-conducting grooves 204 on the heat-conducting copper sheet 202 is the same as the curvature of the surface of the heat-conducting copper tube 201. Therefore, the temperature of the battery 21 can be quickly transferred to the inside of the heat-conducting copper tube 201, and then the overall heat recovery device 2 can use the temperature of the battery 21 to quickly heat the coolant in the pipeline, thereby recovering the heat generated by the battery 21.

[0029] A control method for a power battery thermal management device, the control method comprising the following steps: Step A: When the battery 21 is not heated and does not need to be cooled, the first heater 13 of the water circulation loop and the heat exchanger 11 in the refrigerant circulation loop in the device are not operated, the first stop valve 17 is opened, and the second stop valve 3 is opened, and the water pump 18 is operated to circulate the coolant to achieve the purpose of maintaining the battery 21 at a uniform temperature; Step B: When the temperature of the battery 21 is higher than 30°C and the ambient temperature is less than 5°C, the device starts low-temperature refrigeration to cool the battery 21 higher than 30°C, opens the second stop valve 3, closes the first stop valve 17, and stops the first heater 13. The water pump 18 is operated to make the coolant flow through the low-temperature radiator 8. The wind generated by the high-speed operation of the condensing fan 10 passes through the condenser 7 and blows toward the low-temperature radiator 8, so that the heat of the coolant is exchanged with the low-temperature environment, and the temperature of the coolant is reduced, thereby achieving the purpose of cooling the battery 21; Step C: When the temperature of the battery 21 is higher than 30°C and the ambient temperature is ≥5°C, the device starts high-temperature cooling, opens the first stop valve 17, closes the second stop valve 3, the first heater 13 does not work, and turns on the compressor 4 to operate the refrigerant circulation loop. The water pump 18 is operated to make the coolant flow through the heat exchanger 11, and the heat exchange between the refrigerant and the coolant is completed in the heat exchanger 11, and the coolant temperature is reduced to 10°C, thereby achieving the purpose of cooling the battery 21; Step D: When the temperature of the battery 21 is lower than 10°C and needs to be heated, the device starts heating, and the return water temperature sensor 1 and the outlet water temperature sensor 12 detect that the average temperature of the coolant is lower than 10°C, then the central processor controls to open the first stop valve 17, close the second stop valve 3, and the water pump 18 is powered by an external power supply and operates to make the coolant circulate, and at the same time, the first heater 13 is turned on to heat the coolant, and the coolant temperature is heated to 20°C, thereby achieving the purpose of heating the battery 21; Step E: When the ambient temperature rises to 30°C during the day, the heat exchanger 11 is not powered on, the second stop valve 3 is closed, the first stop valve 17 is opened, the third stop valve 14 and the fourth stop valve 15 are open, the fifth stop valve 16 and the sixth stop valve 25 are also open, and the first heater 13 is not powered on. The heat generated by the battery 21 during operation will be continuously dissipated to the heat recovery device 2, and the ambient temperature will cause the coolant temperature in the pipeline to rise to 20°C, and the coolant in the second heater 26 will be heated to 30°C due to the environment. Step F: When the ambient temperature drops to 10°C at night, the temperature of the coolant inside the first heater 13 is already 10°C. The coolant in the second heater 26 is mixed with the first heater 13 and the coolant in the pipeline, so that the temperature of the coolant is maintained at 20°C.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A power battery thermal management device, comprising a water pump (18), characterized in that: One end of the water pump (18) is connected to a water inlet pipe (20), one side of the surface of the water inlet pipe (20) is connected to a return water temperature sensor (1), one end of the water pump (18) is connected to a first three-way pipe (22), one end of the first three-way pipe (22) is connected to a low-temperature radiator (8), one end of the low-temperature radiator (8) is connected to a second three-way pipe (23) via a pipe, one end of the second three-way pipe (23) is connected to a first heater (13) via a pipe, a water outlet end of the first heater (13) is connected to a heat exchanger (11) via a pipe, a water outlet end of the surface of the heat exchanger (11) and the first three-way pipe (22) are connected via a pipe, the other end of the second three-way pipe (23) is connected to a water outlet pipe (19), and one side of the surface of the water outlet pipe (19) is provided with a water outlet temperature sensor (12); Another water outlet on the surface of the heat exchanger (11) is connected to a compressor (4) via a pipe, one end of the compressor (4) is connected to a condenser (7) via a pipe, and one end of the condenser (7) is connected to one of the water inlets of the heat exchanger (11) via a pipe.

2. A power battery thermal management device according to claim 1, characterized in that: A low-temperature temperature sensor (6) is provided on the surface of the pipe connecting the compressor (4) and the heat exchanger (11), and a high-temperature temperature sensor (5) is provided on the surface of the pipe connecting the compressor (4) and the condenser (7).

3. A power battery thermal management device according to claim 2, characterized in that: An ambient temperature sensor (9) is provided on one side of the low-temperature radiator (8), a second stop valve (3) is provided on the surface of the pipe between the low-temperature radiator (8) and the first three-way pipe (22), and a first stop valve (17) is provided on the pipe connecting the first three-way pipe (22) and the heat exchanger (11).

4. A power battery thermal management device according to claim 3, characterized in that: A condensing fan (10) is provided on the outside of the condenser (7), a low-temperature temperature sensor (6) is provided on the surface of the pipe connecting the compressor (4) and the heat exchanger (11), and a high-temperature temperature sensor (5) is provided on the surface of the pipe connecting the compressor (4) and the condenser (7).

5. A power battery thermal management device according to claim 4, characterized in that: The heat exchanger (11), the first heater (13) and the low-temperature radiator (8) are connected in series via pipelines to form a water circulation loop.

6. A power battery thermal management device according to claim 5, characterized in that: The heat exchanger (11), the compressor (4) and the condenser (7) are connected in series via pipelines to form a refrigerant circulation loop.

7. A power battery thermal management device according to claim 6, characterized in that: A branch pipe (24) is connected to the pipe at the water outlet of the first heater (13) and one end of the second three-way pipe (23); a fifth stop valve (16) is provided at one end of the branch pipe (24); a sixth stop valve (25) is connected to the other end of the branch pipe (24); and a second heater (26) is provided in the middle of the branch pipe (24); The water outlet of the first heater (13) is connected to a third stop valve (14), and the water inlet of the first heater (13) is connected to a fourth stop valve (15); The second heater (26) comprises a water inlet chamber (2601) and a heating chamber (2602); the four end surfaces of the heating chamber (2602) are fixedly connected to a plurality of heating plates (2605); a partition (2611) is fixedly connected between the water inlet chamber (2601) and the heating chamber (2602); a gear box (2604) is provided in the middle of the partition (2611); a rotating blade (2603) is connected to a connecting shaft on the upper side of the gear box (2604); an output end on the lower side of the gear box (2604) is connected to a rotating rod (2609) via a coupling; a plurality of connecting rods (2607) are fixedly connected to both sides of the rotating rod (2609); a rotating plate (2608) is fixedly connected to one side of the connecting rod (2607); and worm wheel blades (2606) are connected to both sides of the upper end of the rotating rod (2609); A water inlet is provided at the upper end of one side of the water inlet chamber (2601), and the water inlet is fixedly connected to the branch pipe (24). A liquid through hole (2610) is provided at the lower end of the other side of the water inlet chamber (2601). A liquid outlet is provided at one side of the bottom end of the heating chamber (2602), and the liquid outlet is connected to the fifth stop valve (16) via a pipeline.

8. A power battery thermal management device according to claim 7, characterized in that: A heat recovery device (2) is connected between the water outlet pipe (19) and the water inlet pipe (20), and a battery (21) is inserted into the heat recovery device (2).

9. A power battery thermal management device according to claim 8, characterized in that: The heat recovery device (2) comprises a heat-conducting copper sheet (202) fixedly connected to the upper and lower ends of the battery (21); a plurality of heat-conducting grooves (204) are arranged on the surface of the heat-conducting copper sheet (202); heat-conducting copper tubes (201) are fitted and installed in the heat-conducting grooves (204); both ends of each heat-conducting copper tube (201) are connected to a buffer tank (203); one end of one of the buffer tanks (203) is connected to a water outlet pipe (19); and one end of another water outlet pipe (19) is connected to a water inlet pipe (20).

10. A control method for a power battery thermal management device according to claim 9, characterized in that: The control method comprises the following steps: Step A: When the battery (21) has no heating or cooling demand, the first heater (13) of the water circulation loop and the heat exchanger (11) in the refrigerant circulation loop in the device do not work, the first stop valve (17) is opened, the second stop valve (3) is closed, the first heater (13) does not work, and the water pump (18) is operated to circulate the coolant to achieve the effect of equalizing the temperature of the battery (21); Step B: When the temperature of the battery (21) is higher than 30°C and the ambient temperature is less than 5°C, the device starts low-temperature refrigeration to cool the battery (21) higher than 30°C, opens the second stop valve (3), closes the first stop valve (17), stops the first heater (13), operates the water pump (18) to make the coolant flow through the low-temperature radiator (8), and the wind generated by the high-speed operation of the condensing fan (10) passes through the condenser (7) and blows toward the low-temperature radiator (8), so that the heat of the coolant is exchanged with the low-temperature environment, the temperature of the coolant is reduced, and the battery (21) is cooled; Step C: When the temperature of the battery (21) is higher than 30°C and the ambient temperature is ≥5°C, the device starts high-temperature cooling, opens the first stop valve (17), closes the second stop valve (3), stops the first heater (13), starts the compressor (4) to operate the refrigerant circulation loop, operates the water pump (18) to make the coolant flow through the heat exchanger (11), completes the heat exchange between the refrigerant and the coolant in the heat exchanger (11), reduces the coolant temperature to 10°C, and cools the battery (21); Step D: When the temperature of the battery (21) is lower than 10°C and needs to be heated, the device starts heating, and the return water temperature sensor (1) and the outlet water temperature sensor (12) detect that the average temperature of the coolant is lower than 10°C, then the central processing unit controls to open the first stop valve (17), close the second stop valve (3), and the water pump (18) is powered by an external power supply and operates to allow the coolant to circulate, and at the same time, the first heater (13) is turned on to heat the coolant, and the coolant temperature is heated to 20°C to heat the battery (21); Step E: When the ambient temperature rises to 30°C during the day, the heat exchanger (11) is not powered on, wherein the second stop valve (3) is closed, the first stop valve (17) is opened, the third stop valve (14) and the fourth stop valve (15) are in an open state, the fifth stop valve (16) and the sixth stop valve (25) are also in an open state, and the first heater (13) is not powered on. The heat generated by the battery (21) during operation will be continuously dissipated to the heat recovery device (2), and the temperature of the coolant in the pipeline will rise to 20°C due to the ambient temperature, and the coolant in the second heater (26) will be heated to 30°C due to the influence of the environment; Step F: When the ambient temperature drops to 10°C at night, the temperature of the coolant inside the first heater (13) is already 10°C. The coolant in the second heater (26) is mixed with the first heater (13) and the coolant in the pipeline, so that the temperature of the coolant is maintained at 20°C.

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