An immersion type battery temperature control system and a control method thereof

Abstract

The application discloses an immersed battery temperature control system and a control method thereof, and belongs to the technical field of batteries. The system comprises a cooling pipeline and a temperature control unit. The cooling pipeline is arranged in cooling liquid and has flowable cooling medium inside. The temperature control unit comprises a medium driving part, a driving heating module and a power generation driving module. When the cooling medium flows, the medium driving part is driven to operate. The driving heating module comprises a generator and a heating part. When the medium driving part operates, the generator drives the heating part to generate power. When the heating part is powered, the cooling liquid is heated. The power generation driving module comprises a motor and a thermoelectric chip. The thermoelectric chip can generate power by using the temperature difference between the cooling liquid and the cooling medium, and supply power to the motor. When the motor is powered, the medium driving part is driven to operate, and the cooling medium is driven to flow. The application has the advantages of high space utilization, self-driven cooling by waste heat recovery, rapid heating and the like.

Description

Technical Field

[0001] This invention belongs to the field of battery technology and relates to a thermal management system for batteries, particularly to an immersion battery temperature control system and its control method. Background Technology

[0002] With the development of new energy technologies, high-power-density battery packs are increasingly widely used in various electric equipment and energy storage systems. Immersion liquid cooling technology, due to its high heat exchange efficiency, is gradually becoming an important direction for temperature control development. However, most existing immersion temperature control systems design heating and cooling as two independent subsystems. This separation of thermal management leads to low overall structural integration and poor space utilization. Under high-temperature, high-rate charge and discharge conditions, existing systems require a large amount of additional electrical energy to drive high-power water pumps for heat dissipation, failing to effectively utilize the rapidly increasing waste heat from the battery. In extremely cold environments, additional external heating equipment such as PTCs are often required to restore battery activity. This not only increases the system size and complexity but also often limits the heating response due to heat transfer hysteresis. Therefore, there is an urgent need for an immersion battery temperature control system that can achieve efficient adaptive switching between hot and cold modes within a single mechanical architecture. Summary of the Invention

[0003] This invention provides an immersion battery temperature control system and its control method to overcome the shortcomings of existing technologies, such as low structural integration, poor space utilization, ineffective utilization of waste heat, and the need for additional heating equipment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides an immersion battery temperature control system, wherein the immersion battery includes a battery box and a battery pack, the battery box being filled with coolant and the battery pack being immersed in the battery box; the system includes a cooling pipe and a temperature control unit; the cooling pipe is disposed in the coolant and has a flowing cooling medium inside; the temperature control unit includes a medium driving component, a driving heating module, and a power generation driving module; when the cooling medium flows, it drives the medium driving component to operate; the driving heating module includes a generator and a heating element; when the medium driving component operates, it drives the generator to supply power to the heating element; when the heating element is energized, it heats the coolant; the power generation driving module includes a motor and a thermoelectric chip; the thermoelectric chip can generate electricity using the temperature difference between the coolant and the cooling medium and supply power to the motor; when the motor is energized, it drives the medium driving component to operate, thereby driving the cooling medium to flow.

[0005] To optimize the above technical solution, the specific measures also include: Furthermore, the driving heating module also includes a generator drive component and a generator transmission cylinder; the power generation drive module also includes a motor drive component and a motor transmission cylinder; the generator drive component, the motor drive component, and the medium drive component drive each other and operate synchronously; the generator drive component is connected to the generator through the generator transmission cylinder, which is a hydraulic coupling transmission and can be switched on and off; when the generator transmission cylinder is on, the generator drive component can drive the generator to generate electricity; when the generator transmission cylinder is off, there is no transmission connection between the generator drive component and the generator; the motor is connected to the motor drive component through the motor transmission cylinder, which is a hydraulic coupling transmission and can be switched on and off; when the motor transmission cylinder is on, the motor can drive the motor drive component to run; when the motor transmission cylinder is off, there is no transmission connection between the motor and the motor drive component.

[0006] Furthermore, the temperature control unit also includes an on / off switching module; the temperature control unit has a heating state and a cooling state; the on / off switching module can switch between the heating state and the cooling state to control the on / off state of the generator drive cylinder and the motor drive cylinder; in the heating state, the on / off switching module controls the generator drive cylinder to be connected and the motor drive cylinder to be disconnected; in the cooling state, the on / off switching module controls the generator drive cylinder to be disconnected and the motor drive cylinder to be connected.

[0007] Further, the on / off switching module includes a double-rod hydraulic cylinder; the drive heating module also includes a generator telescopic cylinder; the generator drive module also includes a motor telescopic cylinder; the double-rod hydraulic cylinder has a slidably connected piston inside, and hydraulic rods are fixed on both sides of the piston, with a pressure block protruding to the side at the outer end of each hydraulic rod; the generator telescopic cylinder and the motor telescopic cylinder are respectively located on the side of the two hydraulic rods with the pressure block; both the generator telescopic cylinder and the motor telescopic cylinder have a cylinder body, a telescopic rod, and a spring; the telescopic rod can extend and retract relative to the cylinder body; the spring is located inside the cylinder body, with one end fixed to the cylinder body and the other end fixed to the inner end of the telescopic rod, and the spring applies a force to the telescopic rod extending outward from the cylinder body; the pressure block has an inclined surface, and the outer end of the telescopic rod abuts against the inclined surface of the corresponding pressure block; when the piston drives the pressure block to move, the pressure block uses the inclined surface to press the telescopic rod against different extension and retraction positions; when the When the piston is positioned close to the electric motor, the telescopic rod of the generator telescopic cylinder is pressed against the corresponding pressure block in the extended position, and the telescopic rod of the electric motor telescopic cylinder is pressed against the corresponding pressure block in the retracted position; when the piston is positioned close to the generator, the telescopic rod of the generator telescopic cylinder is pressed against the corresponding pressure block in the retracted position, and the telescopic rod of the electric motor telescopic cylinder is pressed against the corresponding pressure block in the extended position; both the generator transmission cylinder and the electric motor transmission cylinder have isolation components, which are respectively connected to the inner ends of the telescopic rods of the generator telescopic cylinder and the electric motor telescopic cylinder, and move with the telescopic rods; when the telescopic rod extends, the isolation component disengages from the hydraulic coupling transmission of the generator transmission cylinder / electric motor transmission cylinder, and the generator transmission cylinder / electric motor transmission cylinder becomes connected; when the telescopic rod retracts, the isolation component isolates the hydraulic coupling transmission of the generator transmission cylinder / electric motor transmission cylinder, and the generator transmission cylinder / electric motor transmission cylinder becomes disconnected.

[0008] Further, the generator drive component includes a generator drive shaft and a generator gear fixed to the outer end of the generator drive shaft; the motor drive component includes a motor drive shaft and a motor gear fixed to the outer end of the motor drive shaft; the medium drive component includes a medium drive shaft and medium gears and impellers fixed to both ends of the medium drive shaft; the generator gear, the motor gear, and the medium gear are all bevel gears, the generator gear and the motor gear are arranged opposite to each other, and the medium gear is arranged between and meshes with the generator gear and the motor gear; the impeller is arranged in the cooling pipe, and when the cooling medium flows, it drives the impeller to rotate, and the medium gear drives the generator gear and the motor gear to rotate accordingly; the inner ends of the generator shaft and the generator drive shaft both extend into the generator transmission cylinder to form the hydraulic coupling transmission; the inner ends of the motor output shaft and the motor drive shaft both extend into the motor transmission cylinder to form the hydraulic coupling transmission.

[0009] Furthermore, the temperature control unit is located inside the battery box and also includes a temperature control housing; the heating element includes an electromagnetic induction heating element and an electromagnetic coil; the electromagnetic coil is wound around one end of the electromagnetic induction heating element and located inside the temperature control housing, and the other end of the electromagnetic induction heating element extends out of the temperature control housing and is inserted into the coolant; the generator can supply power to the electromagnetic coil, and when the electromagnetic coil is energized, an electromagnetic eddy current effect is generated inside the electromagnetic induction heating element, causing it to heat up rapidly.

[0010] Furthermore, the thermoelectric chip is located inside the temperature control housing and is equipped with a hot-end heat-conducting element and a cold-end heat-conducting element; one end of the hot-end heat-conducting element is connected to the thermoelectric chip, and the other end extends out of the temperature control housing and is inserted into the coolant; one end of the cold-end heat-conducting element is connected to the thermoelectric chip, and the other end extends out of the temperature control housing and is inserted into the cooling medium in the cooling pipe; the thermoelectric chip is electrically connected to the motor.

[0011] Furthermore, the portions of the hot-end heat-conducting component and the cold-end heat-conducting component located within the temperature control housing are both covered with a layer of thermal insulation material.

[0012] Furthermore, it also includes a cooling medium tank; the cooling pipe is also equipped with a cooling pipe pump and a cooling pipe reversing valve; the cooling medium tank forms a cooling circulation loop with the cooling pipe through the cooling pipe pump and the cooling pipe reversing valve; the cooling pipe reversing valve has two working positions: the valve core is in the left position and the valve core is in the right position. When the valve core is in the right position, the cooling pipe pump drives the cooling medium to flow in the cooling circulation loop; when the valve core is in the left position, the medium driving component drives the cooling medium to flow in the cooling circulation loop; the on / off switching module also includes a hydraulic rod pump and a hydraulic cylinder reversing valve; the cooling medium tank forms a hydraulic circulation loop with the double-rod hydraulic cylinder through the hydraulic rod pump and the hydraulic cylinder reversing valve, and the hydraulic cylinder reversing valve controls the pumping of the cooling medium into the cavity, moves the piston of the double-rod hydraulic cylinder, and controls the switching between the heating state and the cooling state.

[0013] Furthermore, the temperature control unit also includes a temperature sensor; the temperature sensor is disposed inside the battery box and is used to monitor the temperature inside the battery box; the temperature sensor is interlocked with the cooling pipe reversing valve and the hydraulic cylinder reversing valve, and controls the cooling pipe reversing valve and the hydraulic cylinder reversing valve according to the monitored temperature.

[0014] Secondly, the present invention also provides a control method for the above-mentioned immersion battery temperature control system: when the temperature monitored by the temperature sensor is lower than the low temperature threshold, the battery box is in a low temperature environment, and the system executes a heating mode: the valve core of the cooling pipe reversing valve is controlled to be in the right position, the cooling pipe pump works normally, driving the cooling medium to flow in the cooling pipe, the flowing cooling medium drives the medium driving component to run, thereby driving the generator driving component and the motor driving component to run synchronously; at the same time, the piston of the double-rod hydraulic cylinder is controlled to approach the motor position through the hydraulic cylinder reversing valve, the telescopic rod of the motor telescopic cylinder retracts, and the isolating component of the motor transmission cylinder is inserted accordingly, isolating the hydraulic coupling transmission between the motor driving component and the output shaft of the motor, the motor does not work, while the telescopic rod of the generator telescopic cylinder extends, and the isolating component of the generator transmission cylinder moves out accordingly, without isolating the hydraulic coupling transmission between the generator driving component and the motor shaft of the generator, the running generator driving component drives the generator to supply power to the heating component, the heating component is energized, and the coolant is heated. Heating; when the temperature monitored by the temperature sensor is higher than the high temperature threshold, the battery box is in a high temperature environment, and the system executes a cooling mode: the valve core of the cooling pipe reversing valve is controlled to be in the left position, the cooling pipe pump is depressurized, and the power supply to the cooling medium is stopped; at this time, the thermoelectric chip generates electricity using the temperature difference between the coolant and the cooling medium, and supplies power to the motor; simultaneously, the piston of the double-rod hydraulic cylinder is controlled to approach the generator through the hydraulic cylinder reversing valve, the telescopic rod of the generator telescopic cylinder retracts, and the isolator of the generator transmission cylinder is inserted to disconnect the hydraulic coupling transmission between the generator drive and the generator motor shaft, while the telescopic rod of the motor telescopic cylinder extends, and the isolator of the motor transmission cylinder moves out, without disconnecting the hydraulic coupling transmission between the motor drive and the motor output shaft. The energized motor drives the motor drive to run, thereby driving the medium drive and the generator drive to run synchronously. The running medium drive drives the cooling medium to flow in the cooling pipe to cool the coolant.

[0015] The beneficial effects of this invention are as follows: This invention provides an immersion battery temperature control system and its control method. The system highly integrates thermal management functions through a unified mechanical architecture, eliminating the physical superposition of traditional external heating equipment and independent cooling water pumps, and significantly improving the internal space utilization of the system. Under high-temperature conditions, the system utilizes the heat transfer temperature difference to generate electricity via a thermoelectric chip, achieving waste heat recovery and self-driven cooling, greatly reducing additional energy consumption. Under low-temperature conditions, the system uses the kinetic energy of the external cooling medium to drive the generator in reverse, generating heat within the battery box using the electromagnetic eddy current effect, effectively overcoming the hysteresis problem of traditional long-path heat transfer and achieving rapid heating. In addition, the overall system relies on the switching of the power source through the control of the reversing valve and the mechanical displacement of the isolator, with direct, precise, and reliable control logic, possessing extremely strong adaptability to complex operating conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an immersion battery temperature control system. Figure 2 yes Figure 1 Enlarged view of region I; Figure 3 yes Figure 2 Enlarged view of region III; Figure 4 yes Figure 1 Enlarged view of region II; Figure 5 This is a schematic diagram of the heating mode at low temperatures. Figure 6 This is a schematic diagram of the cooling mode operation under high temperature conditions; The labels in the attached diagram are as follows: 1. Cooling pipe; 11. Cooling pipe pump; 12. Cooling pipe reversing valve; 211. Medium drive shaft; 212. Medium gear; 213. Impeller; 221. Generator; 2211. Motor shaft; 2221. Generator drive shaft; 2222. Generator gear; 223. Generator transmission cylinder; 2231. Isolating component; 224. Generator telescopic cylinder; 2241. Cylinder body; 2242. Telescopic rod; 2243. Spring; 2251. Electromagnetic induction heating element; 2252. Electromagnetic coil; 23. 1. Electric motor; 2311. Output shaft; 2321. Electric motor drive shaft; 2322. Electric motor gear; 233. Electric motor transmission cylinder; 234. Electric motor telescopic cylinder; 235. Thermoelectric chip; 2351. Hot end heat conduction component; 2352. Cold end heat conduction component; 241. Double-rod hydraulic cylinder; 2411. Piston; 2412. Hydraulic rod; 2413. Pressure block; 242. Hydraulic rod pump; 243. Hydraulic cylinder reversing valve; 25. Temperature control housing; 26. Temperature sensor; 3. Cooling medium tank; A. Battery box; B. Battery pack. Detailed Implementation

[0017] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, the present invention provides an immersion battery temperature control system. The immersion battery includes a battery box A and a battery pack B, the battery box A is filled with coolant, and the battery pack B is immersed in the battery box A.

[0019] like Figures 1-3 As shown, the system includes a cooling pipe 1 and a temperature control unit. The cooling pipe 1 is disposed in a coolant and contains a flowing cooling medium. The temperature control unit includes a medium drive component, a heating drive module, and a power generation drive module. The medium drive component operates when the cooling medium flows. The heating drive module includes a generator 221 and a heating element. When the medium drive component operates, it drives the generator 221 to supply power to the heating element. When the heating element is energized, it heats the coolant. The power generation drive module includes a motor 231 and a thermoelectric chip 235. The thermoelectric chip 235 generates electricity using the temperature difference between the coolant and the cooling medium, and supplies power to the motor 231. When the motor 231 is energized, it drives the medium drive component, which in turn drives the cooling medium to flow within the cooling pipe 1.

[0020] Among them, such as Figure 2 and Figure 3 As shown, the driving heating module also includes a generator drive component and a generator transmission cylinder 223. The power generation drive module also includes a motor drive component and a motor transmission cylinder 233. The generator drive component, motor drive component, and medium drive component drive each other and operate synchronously; that is, when any one drive component is running, it drives the other two drive components to run synchronously. The generator drive component is connected to the generator 221 through the generator transmission cylinder 223, which is a hydraulic coupling drive and can be switched on and off. When the generator transmission cylinder 223 is on, the generator drive component can drive the generator 221 to generate electricity; when the generator transmission cylinder 223 is off, there is no transmission connection between the generator drive component and the generator 221, that is, the generator drive component cannot drive the generator 221 to generate electricity. The motor 231 is connected to the motor drive component through the motor transmission cylinder 233, which is a hydraulic coupling drive and can be switched on and off. When the electric motor drive cylinder 233 is connected, the electric motor 231 can drive the electric motor drive component to run; when the electric motor drive cylinder 233 is disconnected, there is no transmission connection between the electric motor 231 and the electric motor drive component, that is, the electric motor 231 cannot drive the electric motor drive component to run.

[0021] The temperature control unit also includes an on / off switching module. The temperature control unit has heating and cooling states. The on / off switching module can switch between heating and cooling states to control the on / off state of generator drive cylinder 223 and motor drive cylinder 233. In heating state, the on / off switching module controls generator drive cylinder 223 to be connected and motor drive cylinder 233 to be disconnected; in cooling state, the on / off switching module controls generator drive cylinder 223 to be disconnected and motor drive cylinder 233 to be connected.

[0022] Specifically, such as Figure 2 and Figure 3 As shown, the on / off switching module includes a double-rod hydraulic cylinder 241. The drive heating module also includes a generator telescopic cylinder 224. The generator drive module also includes an electric motor telescopic cylinder 234.

[0023] The double-rod hydraulic cylinder 241 has a piston 2411 that is slidably connected inside. Hydraulic rods 2412 are fixed on both sides of the piston 2411. The outer ends of the hydraulic rods 2412 have pressure blocks 2413 that protrude to the side.

[0024] The generator telescopic cylinder 224 and the motor telescopic cylinder 234 are located on one side of the two hydraulic rods 2412 with pressure blocks 2413, respectively. Both the generator telescopic cylinder 224 and the motor telescopic cylinder 234 have a cylinder body 2241, a telescopic rod 2242, and a spring 2243. The telescopic rod 2242 can extend and retract relative to the cylinder body 2241. The spring 2243 is located inside the cylinder body 2241, with one end fixed to the cylinder body 2241 and the other end fixed to the inner end of the telescopic rod 2242. The spring 2243 applies a force to the telescopic rod 2242 to extend outward from the cylinder body 2241. The pressure block 2413 has an inclined surface, and the outer end of the telescopic rod 2242 abuts against the inclined surface of the corresponding pressure block 2413. When the piston 2411 moves the pressure block 2413, the pressure block 2413, through its inclined surface, presses the telescopic rod 2242 against different telescopic positions.

[0025] When piston 2411 is located near motor 231, the telescopic rod 2242 of generator telescopic cylinder 224 is pressed against the corresponding pressure block 2413 to the extended position, and the telescopic rod 2242 of motor telescopic cylinder 234 is pressed against the corresponding pressure block 2413 to the retracted position; when piston 2411 is located near generator 221, the telescopic rod 2242 of generator telescopic cylinder 224 is pressed against the corresponding pressure block 2413 to the retracted position, and the telescopic rod 2242 of motor telescopic cylinder 234 is pressed against the corresponding pressure block 2413 to the extended position.

[0026] Both the generator drive cylinder 223 and the motor drive cylinder 233 have an isolating element 2231, which is connected to the inner end of the telescopic rod 2242 of the generator telescopic cylinder 224 and the motor telescopic cylinder 234, respectively, and moves with the telescopic rod 2242. When the telescopic rod 2242 extends, the isolating element 2231 disengages from the hydraulic coupling transmission of the generator drive cylinder 223 / motor drive cylinder 233, and the generator drive cylinder 223 / motor drive cylinder 233 are connected. When the telescopic rod 2242 retracts, the isolating element 2231 isolates the hydraulic coupling transmission of the generator drive cylinder 223 / motor drive cylinder 233, and the generator drive cylinder 223 / motor drive cylinder 233 are disconnected.

[0027] Specifically, in the heating state, the piston 2411 of the double-rod hydraulic cylinder 241 is located near the motor 231. At this time, the hydraulic rod 2412 on the generator 221 side is located at the far end of the inclined surface of its pressure block 2413 and abuts against the telescopic rod 2242 of the generator telescopic cylinder 224. The telescopic rod 2242 extends, and the isolator 2231 of the generator transmission cylinder 223 disengages from the hydraulic coupling transmission of the generator transmission cylinder 223. The generator transmission cylinder 223 is connected, and the generator drive can drive the generator 221 to generate electricity. At the same time, the hydraulic rod 2412 of the motor 231 is located at the near end of the inclined surface of its pressure block 2413 and abuts against the telescopic rod 2242 of the motor telescopic cylinder 234. The telescopic rod 2242 retracts, and the isolator 2231 of the motor transmission cylinder 233 isolates the hydraulic coupling transmission of the generator transmission cylinder 223. The motor transmission cylinder 233 is disconnected, and the motor 231 cannot drive the motor drive. In the cooling state, the piston 2411 of the double-rod hydraulic cylinder 241 is located near the generator 221. At this time, the hydraulic rod 2412 on the generator 221 side is located near the inclined surface of its pressure block 2413 and abuts against the telescopic rod 2242 of the generator telescopic cylinder 224. The telescopic rod 2242 retracts, and the isolator 2231 of the generator transmission cylinder 223 isolates the hydraulic coupling transmission of the generator transmission cylinder 223. The generator transmission cylinder 223 is disconnected, and the generator drive cannot drive the generator 221 to generate electricity. At the same time, the hydraulic rod 2412 of the motor 231 is located far from the inclined surface of its pressure block 2413 and abuts against the telescopic rod 2242 of the motor telescopic cylinder 234. The telescopic rod 2242 extends, and the isolator 2231 of the motor transmission cylinder 233 disengages from the hydraulic coupling transmission of the generator transmission cylinder 223. The motor transmission cylinder 233 is connected, and the motor 231 can drive the motor drive to run.

[0028] like Figure 2 and Figure 3As shown, the generator drive unit includes a generator drive shaft 2221 and a generator gear 2222 fixed to the outer end of the generator drive shaft 2221. The motor drive unit includes a motor drive shaft 2321 and a motor gear 2322 fixed to the outer end of the motor drive shaft 2321. The medium drive unit includes a medium drive shaft 211 and a medium gear 212 and an impeller 213 fixed to both ends of the medium drive shaft 211.

[0029] The generator gear 2222, the motor gear 2322, and the medium gear 212 are all bevel gears. The generator gear 2222 and the motor gear 2322 are arranged opposite each other, and the medium gear 212 is arranged between and meshes with the generator gear 2222 and the motor gear 2322. The impeller 213 is arranged in the cooling pipe 1. When the cooling medium flows, it drives the impeller 213 to rotate, and the medium gear 212 drives the generator gear 2222 and the motor gear 2322 to rotate accordingly.

[0030] The inner ends of the generator shaft 2211 and the generator drive shaft 2221 of the generator 221 both extend into the generator transmission cylinder 223 to form a hydraulic coupling transmission. The inner ends of the output shaft 2311 and the motor drive shaft 2321 of the motor 231 both extend into the motor transmission cylinder 233 to form a hydraulic coupling transmission.

[0031] Specifically, the generator drive cylinder 223 / motor drive cylinder 233 is similar to a hydraulic coupling. The driving element (generator drive shaft 2221 / motor output shaft 2311) and the driven element (generator 221 motor shaft 2211 / motor drive shaft 2321) are respectively located on both sides of the isolator 2231, surrounded by transmission fluid. The isolator 2231 controls the flow of transmission fluid between the driving and driven elements. When the transmission fluid between the driving and driven elements is connected, the driving element can drive the driven element to rotate. When the transmission fluid between the driving and driven elements is disconnected, the driven element does not rotate with the driving element.

[0032] like Figures 1-3 As shown, the temperature control unit is located inside the battery box A, and also includes a temperature control housing 25.

[0033] The heating element includes an electromagnetic induction heating element 2251 and an electromagnetic coil 2252. The electromagnetic coil 2252 is wound around one end of the electromagnetic induction heating element 2251 and is located inside the temperature control housing 25. The other end of the electromagnetic induction heating element 2251 extends out of the temperature control housing 25 and is inserted into the coolant. The generator 221 can supply power to the electromagnetic coil 2252. When the electromagnetic coil 2252 is energized, an electromagnetic eddy current effect is generated inside the electromagnetic induction heating element 2251, causing it to heat up rapidly.

[0034] The thermoelectric chip 235 is located inside the temperature control housing 25 and is equipped with a hot-end heat-conducting element 2351 and a cold-end heat-conducting element 2352. One end of the hot-end heat-conducting element 2351 is connected to the thermoelectric chip 235, and the other end extends out of the temperature control housing 25 and is inserted into the coolant. One end of the cold-end heat-conducting element 2352 is connected to the thermoelectric chip 235, and the other end extends out of the temperature control housing 25 and is inserted into the cooling medium in the cooling pipe 1. The thermoelectric chip 235 is electrically connected to the motor 231. When the temperature of the cooling medium is lower than the temperature of the coolant, a temperature difference is formed between the two, driving the thermoelectric chip 235 to generate current. This current directly drives the motor 231 to work, causing the output shaft 2311 of the motor 231 to rotate.

[0035] Preferably, the portions of the hot-end heat conductor 2351 and the cold-end heat conductor 2352 located inside the temperature control housing 25 are covered with a layer of heat-insulating material to maximize the temperature difference between the hot-end heat conductor 2351 and the cold-end heat conductor 2352.

[0036] Specifically, the temperature control housing 25 is positioned above part of the cooling pipe 1. The generator 221, generator drive unit, generator transmission cylinder 223, generator telescopic cylinder 224, motor 231, motor drive unit, motor transmission cylinder 233, motor telescopic cylinder 234, double-rod hydraulic cylinder 241, and medium gear 212 are all housed within the temperature control housing 25. One end of the medium drive shaft 211 is housed within the temperature control housing 25, while the other end extends out of the housing and into the cooling pipe 1. The generator telescopic cylinder 224 and motor telescopic cylinder 234 are respectively fixed above the generator transmission cylinder 223 and motor transmission cylinder 233, and the double-rod hydraulic cylinder 241 is located above the generator telescopic cylinder 224 and motor telescopic cylinder 234.

[0037] like Figure 1 and Figure 4 As shown, the system also includes a cooling medium tank 3.

[0038] Cooling pipe 1 is also equipped with cooling pipe pump 11 and cooling pipe reversing valve 12. Cooling medium tank 3 forms a cooling circulation loop with cooling pipe 1 through cooling pipe pump 11 and cooling pipe reversing valve 12. Cooling pipe reversing valve 12 has two working positions: valve core in the left position and valve core in the right position. When the valve core is in the right position, cooling pipe pump 11 drives the cooling medium to flow in the cooling circulation loop. When the valve core is in the left position, the medium driving element drives the cooling medium to flow in the cooling circulation loop.

[0039] Specifically, the outlet of the cooling medium tank 3, the cooling pipeline pump 11, and the inlet of the cooling pipeline reversing valve 12 are connected in sequence. The first working port of the cooling pipeline reversing valve 12 is connected to the inlet of the cooling pipeline 1, the outlet of the cooling pipeline 1 is connected to the second working port of the cooling pipeline reversing valve 12, and the outlet of the cooling pipeline reversing valve 12 is connected to the inlet of the cooling medium tank 3. In the heating state, the valve core of the cooling pipeline reversing valve 12 is in the right position, its inlet is connected to the first working port, and its second working port is connected to the outlet. The cooling pipeline pump 11 drives the cooling medium to flow in the cooling circulation loop. In the cooling state, the valve core of the cooling pipeline reversing valve 12 is in the left position, its inlet, outlet, first working port, and second working port are connected. The cooling pipeline pump 11 is depressurized, and the impeller 213 drives the cooling medium to flow in the cooling circulation loop.

[0040] The on / off switching module also includes a hydraulic rod pump 242 and a hydraulic cylinder directional valve 243. The cooling medium tank 3 forms a hydraulic circulation loop with the double-rod hydraulic cylinder 241 via the hydraulic rod pump 242 and the hydraulic cylinder directional valve 243. That is, the cooling medium is pumped into one chamber of the double-rod hydraulic cylinder 241 through the hydraulic rod pump 242 and the hydraulic cylinder directional valve 243, and the other chamber flows back to the cooling medium tank 3 through the hydraulic cylinder directional valve 243. The pumping of the cooling medium into the chamber is controlled by the hydraulic cylinder directional valve 243, which moves the piston 2411 of the double-rod hydraulic cylinder 241, thus controlling the switching between heating and cooling states.

[0041] like Figure 1 and Figure 4 As shown, the temperature control unit also includes a temperature sensor 26. The temperature sensor 26 is located inside the battery compartment A and is used to monitor the temperature inside the battery compartment A. The temperature sensor 26 is interlocked with the cooling pipe reversing valve 12 and the hydraulic cylinder reversing valve 243, and controls the cooling pipe reversing valve 12 and the hydraulic cylinder reversing valve 243 according to the monitored temperature.

[0042] Specifically, when the temperature monitored by temperature sensor 26 is below the low-temperature threshold, battery box A is in a low-temperature environment, and the system executes the heating mode. The valve core of cooling pipe reversing valve 12 is controlled to be in the right position, and simultaneously, the cooling medium is pumped into the cavity of double-rod hydraulic cylinder 241 near generator 221 via hydraulic cylinder reversing valve 243, causing piston 2411 to move to a position close to motor 231. When the temperature monitored by temperature sensor 26 is above the high-temperature threshold, battery box A is in a high-temperature environment, and the system executes the cooling mode. The valve core of cooling pipe reversing valve 12 is controlled to be in the left position, and simultaneously, the cooling medium is pumped into the cavity of double-rod hydraulic cylinder 241 near motor 231 via hydraulic cylinder reversing valve 243, causing piston 2411 to move to a position close to generator 221.

[0043] The control method for the submersible battery temperature control system is as follows: like Figure 5As shown, when the temperature monitored by temperature sensor 26 is lower than the low-temperature threshold, battery box A is in a low-temperature environment, and the system executes the heating mode: the valve core of the cooling pipe reversing valve 12 is in the right position, the cooling pipe pump 11 works normally, and the cooling medium is driven to flow in the cooling pipe 1. During the flow, the flowing cooling medium acts as a power source to drive the impeller 213 to rotate. The impeller 213 drives the medium drive shaft 211 and the medium gear 212 to rotate. The medium gear 212 drives the generator gear 2222 and the motor gear 2322 to rotate synchronously. In turn, the generator gear 2222 drives the generator drive shaft 2221 to rotate, and the motor gear 2322 drives the motor drive shaft 2321 to rotate. Synchronously, the hydraulic rod pump 242 pumps the cooling medium into the cavity of the double-rod hydraulic cylinder 241 near the generator 221 through the hydraulic cylinder reversing valve 243, causing the piston 2411 to move to a position close to the motor 231. At this time, the pressure block 2413 of the hydraulic rod 2412 on the motor 231 side pushes the telescopic rod 2242 of the motor telescopic cylinder 234 to retract. The telescopic rod 2242 overcomes the elastic force of the spring 2243 and drives the isolator 2231 of the motor transmission cylinder 233 to insert, which disconnects the hydraulic coupling transmission between the motor drive shaft 2321 and the output shaft 2311 of the motor 231. The output shaft 2311 of the motor 231 does not rotate, that is, the motor 231 does not work. Meanwhile, the pressure block 2413 of the hydraulic rod 2412 on the generator 221 side is far away from the telescopic rod 2242 of the generator telescopic cylinder 224. The telescopic rod 2242 extends under the force of the spring 2243, which drives the isolator 2231 of the generator transmission cylinder 223 to move out. Since the isolator 2231 does not isolate the hydraulic coupling transmission between the generator drive shaft 2221 and the motor shaft 2211 of the generator 221, the motor shaft 2211 of the generator 221 rotates, driving the generator 221 to work. The electrical energy generated by the generator 221 is supplied to the electromagnetic coil 2252, which generates an electromagnetic eddy current effect inside the electromagnetic induction heating element 2251, causing it to heat up rapidly, thereby increasing the overall operating temperature of the battery pack B and improving battery efficiency.

[0044] like Figure 6As shown, when the temperature monitored by temperature sensor 26 is higher than the high temperature threshold, battery box A is in a high temperature environment, and the system executes the cooling mode: the valve core of the cooling pipe reversing valve 12 is in the left position, the cooling pipe pump 11 is depressurized, and the power supply to the cooling medium is stopped. At this time, the temperature inside battery box A is high, and the temperature inside cooling pipe 1 is low. The hot end heat conductor 2351 is in contact with the liquid in battery box A and is at a high temperature, while the cold end heat conductor 2352 is in contact with the cooling medium in cooling pipe 1 and is at a low temperature. A high and low temperature difference is formed between the two, which drives the thermoelectric chip 235 to generate current. This current directly drives the motor 231 to work, causing the output shaft 2311 of the motor 231 to rotate. Simultaneously, the hydraulic rod pump 242 pumps the cooling medium into the cavity of the double-rod hydraulic cylinder 241 near the motor 231 through the hydraulic cylinder reversing valve 243, causing the piston 2411 to move to a position close to the generator 221. At this time, the pressure block 2413 of the hydraulic rod 2412 on the generator 221 side pushes the telescopic rod 2242 of the generator telescopic cylinder 224 to retract. The telescopic rod 2242 overcomes the elastic force of the spring 2243 and drives the isolator 2231 of the generator transmission cylinder 223 to insert, which isolates the hydraulic coupling transmission between the generator drive shaft 2221 and the motor shaft 2211 of the generator 221. The motor shaft 2211 of the generator 221 does not rotate, that is, the generator 221 does not work. The pressure block 2413 of the hydraulic rod 2412 on the side of the motor 231 is far away from the telescopic rod 2242 of the motor telescopic cylinder 234. The telescopic rod 2242 extends under the force of the spring 2243, which drives the isolator 2231 of the motor transmission cylinder 233 to move out. Since the isolator 2231 does not isolate the hydraulic coupling transmission between the output shaft 2311 of the motor 231 and the motor drive shaft 2321, the output shaft 2311 of the motor 231 drives the motor drive shaft 2321 to rotate. The motor drive shaft 2321 drives the motor gear 2322 to rotate. The rotation of the motor gear 2322 drives the medium gear 212 to rotate. The medium gear 212 drives the medium drive shaft 211 and the impeller 213 to rotate. The medium gear 212 also drives the generator gear 2222 to rotate. The generator gear 2222 drives the generator drive shaft 2221 to rotate. However, due to the isolating effect of the isolator 2231 of the generator transmission cylinder 223, the motor shaft 2211 of the generator 221 does not rotate, so the generator 221 does not work. During this process, the impeller 213 serves as the power source and circulating cooling medium, continuously cooling the battery pack B by utilizing the mechanical energy converted from waste heat, thus achieving self-driven energy-saving cooling.

[0045] In this invention, unless otherwise stated, scientific and technical terms used herein have the meanings commonly understood by those skilled in the art.

[0046] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "back" used in the invention are only for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0047] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A submersible battery temperature control system, wherein the submersible battery includes a battery case and a battery pack, the battery case is filled with coolant, and the battery pack is submerged in the battery case, characterized in that: Includes cooling pipes and temperature control units; The cooling pipe is disposed in the coolant and has a flowing cooling medium inside; The temperature control unit includes a medium driving component, a driving heating module, and a power generation driving module; When the cooling medium flows, it drives the medium driving component to operate; The driving heating module includes a generator and a heating element; when the medium driving element is running, it drives the generator to supply power to the heating element; when the heating element is energized, it heats the coolant. The power generation drive module includes an electric motor and a thermoelectric chip; the thermoelectric chip can generate electricity by utilizing the temperature difference between the coolant and the cooling medium, and supply power to the electric motor; when the electric motor is energized, it drives the medium drive component to run, thereby driving the cooling medium to flow.

2. The immersion battery temperature control system according to claim 1, characterized in that: The drive heating module further includes a generator drive component and a generator transmission cylinder; the generator drive module further includes an electric motor drive component and an electric motor transmission cylinder; The generator drive unit, the electric motor drive unit, and the medium drive unit drive each other and operate synchronously. The generator drive unit is connected to the generator via the generator transmission cylinder, which is a hydraulic coupling transmission and can be switched on and off. When the generator transmission cylinder is on, the generator drive unit can drive the generator to generate electricity. When the generator transmission cylinder is off, there is no transmission connection between the generator drive unit and the generator. The electric motor is connected to the electric motor drive unit via the electric motor transmission cylinder. The electric motor transmission cylinder is a hydraulic coupling transmission and can be switched on and off. When the electric motor transmission cylinder is on, the electric motor can drive the electric motor drive unit to run. When the electric motor transmission cylinder is off, there is no transmission connection between the electric motor and the electric motor drive unit.

3. The immersion battery temperature control system according to claim 2, characterized in that: The temperature control unit also includes an on / off switching module; The on / off switching module can switch between heating and cooling states to control the on / off state of the generator drive cylinder and the motor drive cylinder. In the heating state, the on / off switching module controls the generator drive cylinder to be connected and the motor drive cylinder to be disconnected; in the cooling state, the on / off switching module controls the generator drive cylinder to be disconnected and the motor drive cylinder to be connected.

4. The immersion battery temperature control system according to claim 3, characterized in that: The on / off switching module includes a double-rod hydraulic cylinder; the drive heating module also includes a generator telescopic cylinder; the generator drive module also includes an electric motor telescopic cylinder. The double-rod hydraulic cylinder has a piston that is slidably connected inside. Hydraulic rods are fixed on both sides of the piston, and the outer ends of the hydraulic rods have protruding pressure blocks. The generator telescopic cylinder and the motor telescopic cylinder are respectively located on one side of the two hydraulic rods having the pressure block; Both the generator telescopic cylinder and the motor telescopic cylinder have a cylinder body, a telescopic rod, and a spring; The telescopic rod can extend and retract relative to the cylinder body; the spring is located inside the cylinder body, with one end fixed to the cylinder body and the other end fixed to the inner end of the telescopic rod, and the spring applies a force to the telescopic rod to extend outward from the cylinder body; The pressure block has an inclined surface, and the outer end of the telescopic rod abuts against the inclined surface of the corresponding pressure block. When the piston drives the pressure block to move, the pressure block abuts the telescopic rod against different telescopic positions through the inclined surface. When the piston is positioned close to the electric motor, the telescopic rod of the generator telescopic cylinder is in the extended position, and the telescopic rod of the electric motor telescopic cylinder is in the retracted position; when the piston is positioned close to the generator, the telescopic rod of the generator telescopic cylinder is in the retracted position, and the telescopic rod of the electric motor telescopic cylinder is in the extended position. Both the generator drive cylinder and the motor drive cylinder have isolation components, which are respectively connected to the inner ends of the telescopic rods of the generator telescopic cylinder and the motor telescopic cylinder, and move with the telescopic rods. When the telescopic rod extends, the isolation component disengages from the hydraulic coupling transmission of the generator drive cylinder / motor drive cylinder, and the generator drive cylinder / motor drive cylinder becomes connected. When the telescopic rod retracts, the isolation component isolates the hydraulic coupling transmission of the generator drive cylinder / motor drive cylinder, and the generator drive cylinder / motor drive cylinder becomes disconnected.

5. The immersion battery temperature control system according to claim 2, characterized in that: The generator drive unit includes a generator drive shaft and a generator gear fixed to the outer end of the generator drive shaft; the motor drive unit includes a motor drive shaft and a motor gear fixed to the outer end of the motor drive shaft; the medium drive unit includes a medium drive shaft and medium gears and impellers fixed to both ends of the medium drive shaft. The generator gear, the motor gear, and the medium gear are all bevel gears. The generator gear and the motor gear are arranged opposite to each other, and the medium gear is arranged between and meshes with the generator gear and the motor gear. The impeller is arranged in the cooling pipe. When the cooling medium flows, it drives the impeller to rotate, and the medium gear drives the generator gear and the motor gear to rotate accordingly. The inner ends of the generator shaft and the generator drive shaft both extend into the generator transmission cylinder to form the hydraulic coupling transmission. The inner ends of the motor's output shaft and the motor's drive shaft both extend into the motor's transmission cylinder to form the hydraulic coupling transmission.

6. The immersion battery temperature control system according to claim 1, characterized in that: The temperature control unit is located inside the battery box and also includes a temperature control housing; The heating element includes an electromagnetic induction heating element and an electromagnetic coil; the electromagnetic coil is wound around one end of the electromagnetic induction heating element and located inside the temperature control housing, while the other end of the electromagnetic induction heating element extends out of the temperature control housing and is inserted into the coolant; the generator can supply power to the electromagnetic coil.

7. The immersion battery temperature control system according to claim 6, characterized in that: The thermoelectric chip is located inside the temperature control housing and is equipped with a hot-end heat-conducting component and a cold-end heat-conducting component; one end of the hot-end heat-conducting component is connected to the thermoelectric chip, and the other end extends out of the temperature control housing and is inserted into the coolant; one end of the cold-end heat-conducting component is connected to the thermoelectric chip, and the other end extends out of the temperature control housing and is inserted into the cooling medium in the cooling pipe; the thermoelectric chip is electrically connected to the motor. The portions of both the hot-end and cold-end heat-conducting components located within the temperature control housing are covered with a layer of thermal insulation material.

8. The immersion battery temperature control system according to claim 4, characterized in that: It also includes a cooling medium tank; The cooling pipe is also equipped with a cooling pipe pump and a cooling pipe reversing valve; the cooling medium tank forms a cooling circulation loop with the cooling pipe through the cooling pipe pump and the cooling pipe reversing valve; the cooling pipe reversing valve has two working positions: the valve core is in the left position and the valve core is in the right position. When the valve core is in the right position, the cooling pipe pump drives the cooling medium to flow in the cooling circulation loop. When the valve core is in the left position, the medium driving component drives the cooling medium to flow in the cooling circulation loop. The on / off switching module also includes a hydraulic rod pump and a hydraulic cylinder reversing valve; the cooling medium tank forms a hydraulic circulation loop with the double-rod hydraulic cylinder through the hydraulic rod pump and the hydraulic cylinder reversing valve, and controls the pumping of the cooling medium into the cavity through the hydraulic cylinder reversing valve, moves the piston of the double-rod hydraulic cylinder, and controls the switching between the heating state and the cooling state.

9. The immersion battery temperature control system according to claim 8, characterized in that: The temperature control unit also includes a temperature sensor; The temperature sensor is installed inside the battery box to monitor the temperature inside the battery box; The temperature sensor is interlocked with the cooling pipe reversing valve and the hydraulic cylinder reversing valve, and controls the cooling pipe reversing valve and the hydraulic cylinder reversing valve according to the monitored temperature.

10. The control method of the immersion battery temperature control system as described in claim 9, characterized in that: When the temperature monitored by the temperature sensor is lower than the low-temperature threshold, the battery box is in a low-temperature environment, and the system executes the heating mode: the valve core of the cooling pipe reversing valve is controlled to be in the right position, the cooling pipe pump works normally, driving the cooling medium to flow in the cooling pipe, the flowing cooling medium drives the medium driving component to run, thereby driving the generator driving component and the motor driving component to run synchronously; at the same time, the piston of the double-rod hydraulic cylinder is controlled to approach the motor position through the hydraulic cylinder reversing valve, the telescopic rod of the motor telescopic cylinder retracts, and the isolating component of the motor transmission cylinder is inserted accordingly, severing the hydraulic coupling transmission between the motor driving component and the output shaft of the motor, the motor does not work, while the telescopic rod of the generator telescopic cylinder extends, and the isolating component of the generator transmission cylinder moves out accordingly, without severing the hydraulic coupling transmission between the generator driving component and the motor shaft of the generator, the running generator driving component drives the generator to supply power to the heating element, the heating element is energized, and heats the coolant; When the temperature monitored by the temperature sensor is higher than the high-temperature threshold, the battery box is in a high-temperature environment, and the system executes a cooling mode: the valve core of the cooling pipe reversing valve is controlled to be in the left position, the cooling pipe pump is depressurized, and the power supply to the cooling medium is stopped; at this time, the thermoelectric chip generates electricity using the temperature difference between the coolant and the cooling medium, and supplies power to the motor; simultaneously, the piston of the double-rod hydraulic cylinder is controlled to approach the generator through the hydraulic cylinder reversing valve, the telescopic rod of the generator telescopic cylinder retracts, and the isolator of the generator transmission cylinder is inserted to disconnect the hydraulic coupling transmission between the generator drive and the generator motor shaft, while the telescopic rod of the motor telescopic cylinder extends, and the isolator of the motor transmission cylinder moves out, without disconnecting the hydraulic coupling transmission between the motor drive and the motor output shaft. The energized motor drives the motor drive to run, thereby driving the medium drive and the generator drive to run synchronously. The running medium drive drives the cooling medium to flow in the cooling pipe to cool the coolant.

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