A power battery thermal management device and control method thereof

Abstract

The present invention discloses a power battery thermal management device and a control method thereof, relating to the field of power battery thermal management technology. The device addresses the problem of high overall energy consumption in environments with large temperature differences between day and night. The device and control method comprise a water pump, one end of which is connected to a water inlet pipe, a return water temperature sensor connected to one side of the surface of the water inlet pipe, one end of which is connected to a low-temperature radiator, and one end of which is connected to a second tee pipe. The present invention provides a branch pipe with a fifth shutoff valve provided on its surface, a third shutoff valve connected to the water outlet of a first heater, and a fourth shutoff valve connected to the water inlet of the first heater. The energy consumed by raising the coolant temperature in the pipe from 10°C to 20°C is much less than the energy consumed by raising the coolant temperature from 0°C to 20°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 accelerating electrification of the construction machinery industry, high-power power batteries are crucial for ensuring the proper operation of these products. Battery thermal management technology has become one of the main factors affecting battery energy efficiency. If thermal management equipment fails to effectively cool or heat the battery, thermal runaway or battery range degradation may occur, leading to battery short circuits, bulging, fire, and ultimately safety accidents. This highlights the importance of battery thermal management equipment as crucial for ensuring the continued safe operation of the entire construction machinery product. The optimal operating temperature range for batteries is typically between 20°C and 30°C. Within this temperature range, battery performance and lifespan are well guaranteed.

[0003] The power battery thermal management equipment currently used in the industry is a separate control of independent cooling equipment and independent heating equipment. 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. Existing lithium batteries need to be heated from 0°C to 20°C in some special environments, especially in some environments with large temperature differences between day and night, which consumes a lot of energy. The overall energy consumption of the equipment is high, so it does not meet existing needs. In this regard, we propose a power battery thermal management device and its control method. 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 objectives, the present invention provides the following technical solution: a power battery thermal management device, comprising a water pump, one end of the water pump being connected to a water inlet pipe, one side of the surface of the water inlet pipe being connected to a return water temperature sensor, one end of the water pump being connected to a first tee, one end of the first tee being connected to a low-temperature radiator, one end of the low-temperature radiator being connected to a second tee via a pipe, one end of the second tee being connected to a first heater via a pipe, a water outlet end of the first heater being connected to a heat exchanger via a pipe, a water outlet end of a surface of the heat exchanger being connected to the first tee via a pipe, the other end of the second tee being connected to a battery, and a water outlet temperature sensor being provided on one side of the battery surface;

[0006] Another water outlet on the surface of the heat exchanger is connected to a compressor via a pipe, one end of the compressor is connected to a condenser via a pipe, and one end of the condenser is connected to one of the water inlets of the heat exchanger via a pipe.

[0007] 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.

[0008] 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.

[0009] Preferably, a condensing fan is provided on the outside of the condenser.

[0010] Preferably, the heat exchanger, the first heater and the low-temperature radiator are connected in series through pipelines to form a water circulation loop.

[0011] Preferably, the heat exchanger, compressor and condenser are connected in series through pipelines to form a refrigerant circulation loop.

[0012] Preferably, a branch pipe is connected to the pipe at the water outlet of the first heater and one end of the second tee pipe, a fifth stop valve is provided on the surface of the branch pipe, the water outlet of the first heater is connected to a third stop valve, the water inlet of the first heater is connected to a fourth stop valve, the other end of the branch pipe is connected to a sixth stop valve, and a second heater is provided in the middle of the branch pipe;

[0013] The second heater includes 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 provided in the middle of the partition, a rotating blade is connected to the connecting shaft on the upper side of the gear box, the output end of the lower side of the gear box is connected to a rotating rod through a coupling, a plurality of connecting rods are fixedly connected on both sides of the rotating rod, a rotating plate is fixedly connected to one side of the connecting rod, and worm blades are connected on both sides of the upper end of the rotating rod;

[0014] 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, and a liquid outlet is provided on one side of the bottom end of the heating chamber. The liquid outlet and the fifth stop valve are connected through a pipeline.

[0015] Preferably, a heat recovery device is connected between the water outlet pipe and the water inlet pipe, and a battery is installed in the heat recovery device.

[0016] 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, and heat-conducting copper tubes are fitted in the heat-conducting grooves. Both ends of each heat-conducting copper tube are connected to a buffer tank, one end of one buffer tank is connected to the water outlet pipe, and one end of the other buffer tank is connected to the water inlet pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The water circulation loop of the present invention is 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;

[0019] The refrigerant circulation loop consists 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 device can automatically control the device to switch between multiple working modes such as self-circulation, low-temperature cooling, high-temperature cooling, and heating according to the ambient temperature.

[0020] 2. In the present invention, when the ambient temperature gradually rises to 30°C during the day, the heat exchanger is first de-energized, the second stop valve is closed, the first stop valve is open, 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 de-energized. At this time, the water pump is energized to circulate the coolant in the pipeline. 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.

[0021] 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 opened first, so that the 30°C coolant inside the second heater and the 10°C coolant remaining inside the first heater and its pipes are mixed and circulated 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

[0022] Figure 1 This is a piping diagram of the battery thermal management device in the present invention;

[0023] Figure 2 It is the overall three-dimensional structural diagram of the present invention;

[0024] Figure 3 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 of the present invention;

[0025] Figure 4This is a three-dimensional structural diagram of the heat recovery device of the present invention;

[0026] Figure 5 For the present invention Figure 4 Enlarged structural diagram of the heat recovery device;

[0027] Figure 6 A side cutaway view of the second heater in the present invention

[0028] Figure: 1. Return water temperature sensor; 2. Heat recovery device; 201. Thermal copper tube; 202. Thermal copper sheet; 203. Buffer tank; 204. Thermal groove; 3. Second shut-off 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 shut-off valve; 15. Fourth shut-off valve; 16. Fifth shut-off 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

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described 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.

[0030] See also Figures 1 to 6 An embodiment of the present invention provides: a power battery thermal management device, including 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 tee pipe 22, one end of the first tee pipe 22 is connected to a low-temperature radiator 8, one end of the low-temperature radiator 8 is connected to a second tee pipe 23 through a pipe, one end of the second tee pipe 23 is connected to a first heater 13 through a pipe, a water outlet end of the first heater 13 is connected to a heat exchanger 11 through a pipe, one water outlet end of the surface of the heat exchanger 11 and the first tee pipe 22 are connected through a pipe, the other end of the second tee 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.

[0031] 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.

[0032] 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.

[0033] 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;

[0034] A refrigerant circulation circuit is formed by the compressor 4 , the high temperature sensor 5 , the low temperature sensor 6 , the condenser 7 , the first heater 13 , the first stop valve 17 and the heat exchanger 11 .

[0035] The high temperature sensor 5 and the low temperature sensor 6 are used to monitor the temperature of the refrigerant in the compressor 4, and 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. 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.

[0036] like Figure 1 As shown, the ambient temperature sensor 9 is used to monitor the ambient temperature. The entire device automatically controls the device to switch between multiple working modes such as self-circulation, low-temperature cooling, high-temperature cooling, and heating according to the ambient temperature. Except for the second heater 26, all other devices of the entire device are installed indoors. The indoor environment is relatively mild compared to the external environment, and the indoor ambient temperature difference is small.

[0037] When the battery 21 is not heated and does not require cooling, the first heater 13 of the water circulation circuit and the heat exchanger 11 of the refrigerant circulation circuit in the device are not in operation, the first stop valve 17 is opened, the second stop valve 3 is opened, and the water pump 18 is operated to circulate the coolant to achieve the purpose of maintaining a uniform temperature of the battery 21;

[0038] 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 which is 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 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 both monitor the temperature of the coolant at two positions in 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 controls the operation of the condensing fan 10.

[0039] 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 processing unit receives the electrical signal from 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 temperature sensor 6 detects that the temperature of the refrigerant in the compressor 4 is lower than 5°C; when the high-temperature 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;

[0040] When the temperature of the battery 21 is lower than 10°C and needs to be heated, the device starts heating. 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 stop valve 17 and the closing of the second stop valve 3. The water pump 18 is powered by an external power supply and operates to allow the coolant to circulate. 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.

[0041] 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.

[0042] 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 first not powered on, the second stop valve 3 is closed, the first stop valve 17 is open, 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.

[0043] The second heater 26 includes a water inlet chamber 2601 and a heating chamber 2602. A plurality of heating plates 2605 are fixedly connected to the four end surfaces of the heating chamber 2602. 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 the connecting shaft on the upper side of the gear box 2604. The output end of the lower side of the gear box 2604 is connected to a rotating rod 2609 through a coupling. The lower end of the rotating rod 2609 is connected to the inner portion of the second heater 26. The bottom end is connected by a bearing, and multiple connecting rods 2607 are fixedly connected to both sides of the rotating rod 2609. The upper side of the rotating rod 2609 is fixedly connected to the worm wheel blade 2606, and one side of the connecting rod 2607 is fixedly connected to the rotating plate 2608. 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 hole 2610 is provided at the lower end of the other side of the water inlet chamber 2601. A liquid outlet is provided on 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.

[0044] In the above arrangement of the second heater 26, the coolant enters the water inlet chamber 2601 through the branch pipe 24. After the coolant 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 inside 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. The rotating rod 2609 also drives the worm wheel blade 2606 and the rotating plate 2608 to rotate.

[0045] 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. 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 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.

[0046] When the coolant temperature continues to rise 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. At the same time, the third stop valve 14 and the fourth stop valve 15 are open. The heat exchanger 11 is turned on and operates, and the heat exchanger 11 cools the coolant temperature in the pipeline to 10°C, thereby preventing the temperature of the battery 21 from 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.

[0047] 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, the fifth stop valve 16 and the sixth stop valve 25 are first opened, 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 coolant of 20°C. 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 13 to directly heat the coolant. Therefore, the energy-saving mode of this setting can save the energy consumed by heating the battery 21.

[0048] 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 in the heat-conducting grooves 204. Both ends of the heat-conducting copper tubes 201 are connected to buffer tanks 203. 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.

[0049] A control method for a power battery thermal management device, the control method comprising the following steps:

[0050] Step A: When the battery 21 is not heated and does not require cooling, the first heater 13 of the water circulation loop and the heat exchanger 11 of 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. The water pump 18 is operated to circulate the coolant to achieve the purpose of maintaining a uniform temperature of the battery 21.

[0051] 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 cooling to cool the battery 21 above 30°C. The second stop valve 3 is opened, the first stop valve 17 is closed, the first heater 13 is deactivated, and the water pump 18 is operated to cause the coolant to 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, exchanging heat between the coolant and the low-temperature environment, thereby lowering the coolant temperature and cooling the battery 21.

[0052] 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, turns on the compressor 4 to operate the refrigerant circulation loop, and operates the water pump 18 to make the coolant flow through the heat exchanger 11. 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;

[0053] Step D: When the temperature of the battery 21 is lower than 10°C and needs to be heated, the device starts heating. 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 stop valve 17 and the closing of the second stop valve 3. The water pump 18 is powered by an external power supply and operates to circulate the coolant. 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.

[0054] 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 open, 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 is continuously dissipated to the heat recovery device 2. The heat, combined with the ambient temperature, causes the coolant temperature in the pipeline to rise to 20°C, and the coolant in the second heater 26 is heated to 30°C due to the ambient temperature.

[0055] 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 coolant temperature is maintained at 20°C.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed 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) through a pipe, one end of the second three-way pipe (23) is connected to a first heater (13) through a pipe, a water outlet end of the first heater (13) is connected to a heat exchanger (11) through a pipe, a water outlet end of the surface of the heat exchanger (11) and the first three-way pipe (22) are connected through 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; a branch pipe (24) is connected to the pipe at the water outlet of the first heater (13) and one end of the second tee pipe (23); one end of the branch pipe (24) is provided with a fifth stop valve (16), the other end of the branch pipe (24) is connected to a sixth stop valve (25), 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 the 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 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. After the coolant 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) and the worm wheel blade (2606) are fixedly connected. The rotating rod (2609) also drives the worm wheel blade (2606) and the rotating plate (2608) to rotate. 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. The thermal conductivity of the heating plate (2605) with a low specific heat capacity accelerates the efficiency of heating inside the heating chamber (2602). 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. 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).

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

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 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).

8. A power battery thermal management device according to claim 7, 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); a heat-conducting copper tube (201) is fitted in the heat-conducting groove (204); both ends of each heat-conducting copper tube (201) are connected to a buffer tank (203); one end of one buffer tank (203) is connected to a water outlet pipe (19), and one end of another buffer tank (203) is connected to a water inlet pipe (20).

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