An immersion heat management unit

Abstract

The utility model relates to battery heat management technical field discloses a kind of submerged heat management units, including cabinet, fan, filter screen, compressor, heat exchanger, liquid storage tank, oil tank, water pump valve seat, oil pump, condenser, all-in-one controller and power box, and the upper portion of oil tank front end is provided with exhaust hole, and exhaust hole is connected with exhaust ball valve, and the lower portion of oil tank front end is provided with oil tank oil inlet and oil tank oil outlet, and the rear end of oil tank oil inlet is connected with oil tank inlet pipeline, and the front end of oil tank inlet pipeline is connected with water inlet and liquid supplement interface, and liquid supplement interface is installed with liquid supplement ball valve;Water pump valve seat is fixed in cabinet by flow channel fixing seat, and the bottom of water pump valve seat is provided with valve seat flow channel entrance and valve seat flow channel exit, and the top of water pump valve seat is provided with several mounting hole positions.The utility model can reduce operation difficulty and cost, improve the performance and service life of heat management unit.

Description

Technical Field

[0001] This utility model relates to the field of battery thermal management technology, and in particular to an immersion thermal management unit. Background Technology

[0002] With the increasing energy density and discharge power of batteries, traditional heat dissipation solutions such as air cooling and cold plate liquid cooling are no longer sufficient to meet current battery heat dissipation requirements. Immersion liquid-cooled battery thermal management systems, as one of the efficient thermal management solutions for energy storage systems, are receiving increasing attention. Direct liquid cooling, also known as immersion liquid cooling, is currently one of the most effective heat dissipation technologies, offering advantages such as high-efficiency heat dissipation, energy saving, space saving, and stable low noise. This cooling system immerses the battery in a non-conductive dielectric, ensuring uniform heat conduction and thus guaranteeing the temperature uniformity of the battery pack. Because the heat exchange medium is in direct contact with the battery, the contact thermal resistance is reduced, further improving heat exchange efficiency.

[0003] There is limited research on the specific structure and industrial application design of battery immersion thermal management units in existing technologies. For example, traditional units typically include an expansion tank, which consists of a pressurized rubber bulb. However, the rubber bulb in the expansion tank is prone to natural leakage and easily loses its function after a few years of use, requiring removal (similar to a car tire) and inflation to restore its functionality. This necessitates disassembling the unit for maintenance, resulting in high operating costs. Furthermore, immersion coolants exhibit thermal expansion and contraction, necessitating the installation of devices within the unit to absorb this thermal expansion and contraction. In traditional battery packs, the coolant in conventional units only flows within the cold plate, requiring relatively little coolant. In contrast, immersion cooling requires the coolant to submerge the battery cells, so the volume of the immersion fluid is typically more than twice that of the original, necessitating an improved capacity of the expansion tank to absorb thermal expansion and contraction.

[0004] Furthermore, submersible units require high-performance coolants, typically with viscosities several times greater than traditional ethylene glycol solutions. Most existing units use conventional pumps with resin blades designed for ethylene glycol solutions, making them unsuitable for the durability and lifespan requirements of synthetic oils with significantly higher viscosities. While industrial canned motor pumps, with metal internal blades, can meet these functional and lifespan requirements, their cost (10 times that of conventional pumps) and size (5 times that of conventional pumps) present significant obstacles.

[0005] Existing technologies include some research on battery immersion thermal management systems, such as the Chinese utility model patent application CN202410684442.6 entitled "Immersion Liquid-Cooled Energy Storage Battery System." This patent addresses the shortcomings of existing energy storage battery systems, where most battery packs use air cooling, cold plates, or immersion liquid cooling, failing to achieve uniform temperature distribution among the battery cells and resolve thermal runaway issues. It proposes providing separate liquid-cooled circulation loops for multiple battery packs, which helps achieve uniform temperature distribution among the cells and solves the problem of excessive battery pack pressure, thereby effectively suppressing thermal runaway and ensuring the safety of the energy storage battery system. However, its cooling device includes multiple heat exchange modules and multiple refrigerant circulation modules, resulting in a complex system composition, high cost, and undisclosed system structure. Furthermore, it uses a water pump as the immersion liquid circulation device and an expansion valve to control the refrigerant flow rate, leading to low durability and a short service life for high-viscosity immersion liquids.

[0006] Application number CN202311715526.3, entitled "A Temperature and Humidity Control System and Control Method for Energy Storage," describes a system that, when the battery pack is in standby mode and the outdoor environment is at extremely low temperatures, controls the compressor to heat up while simultaneously activating the evaporator and electric heating device. It heats the battery pack rapidly through hot air blowing and liquid-cooled cooling channels, addressing the problem of poor battery pack heating in low-temperature environments found in existing technologies. However, it does not disclose the specific structure of the system, and it also uses a water pump as the immersion liquid circulation device and an expansion valve to control the refrigerant flow, thus facing similar issues of durability and short service life. Similarly, application number CN202323331544.X, entitled "A Thermal Management System for Immersed Energy Storage Batteries," suffers from the same problems. Utility Model Content

[0007] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an immersion thermal management unit that can reduce the difficulty and cost of operation and maintenance, and improve the performance and service life of the thermal management unit.

[0008] This utility model is achieved using the following technical solution: an immersion thermal management unit, comprising a cabinet, a fan, a filter, a compressor, a heat exchanger, a liquid storage tank, an oil storage tank, a water pump valve seat, an oil pump, a condenser, a multi-functional controller, and a power supply box. The upper front end of the oil storage tank has an exhaust port connected to it, and an exhaust ball valve is connected to the exhaust port. The lower front end of the oil storage tank has an oil inlet and an oil outlet. The oil inlet is connected to the rear end of an oil tank inlet pipe, and the front end of the oil tank inlet pipe is connected to a water inlet and a replenishment interface, on which a replenishment ball valve is installed. The water pump valve seat is fixed inside the cabinet by a flow channel fixing seat. The bottom of the water pump valve seat has a valve seat flow channel inlet and an outlet at both ends. The top of the water pump valve seat has several mounting holes, each detachably housing an oil pump. The oil outlet of the oil storage tank is connected to the valve seat flow channel inlet via a flow channel inlet hose. The heat exchanger has a... The system includes a first liquid inlet and a second liquid inlet on one side of the heat exchanger, and two refrigerant inlets on the other side. The valve seat outlet is connected to the second liquid inlet via a second liquid pipe, and the first liquid inlet is connected to the rear end of the first liquid pipe. The compressor inlet is connected to one refrigerant inlet of the heat exchanger via a second refrigerant pipe, the compressor outlet is connected to the condenser inlet via a third refrigerant pipe, the condenser outlet is connected to the inlet of the liquid receiver via a fourth refrigerant pipe, and the liquid receiver outlet is connected to the second refrigerant inlet of the heat exchanger via a first refrigerant pipe. The condenser is vertically fixed to the rear of the cabinet by a condenser bracket. A fan is installed on the rear side of the cabinet next to the condenser, and a filter is removably installed on the front side of the cabinet. The multi-function controller and power supply box are both installed inside the cabinet.

[0009] Furthermore, the cabinet includes a main panel, side panels, and a top panel. The side panels are fixed to the left and right sides of the main panel with screws, and the top panel is fixed to the top of the main panel with screws. Each side panel has a handle fixed to its front end. The main panel includes a front panel, a bottom panel, and a rear panel. The bottom panel is fixed to the bottom of the front and rear panels. The rear panel has several fan mounting holes, and the fans are installed in the fan mounting holes. The front panel has a mounting groove in the center, and a retaining ring is provided along the edge of the mounting groove. Several rotating buckles are installed on the front panel by threaded engagement. The filter screen is installed in the mounting groove in the center of the front panel and is secured by the rotating buckles.

[0010] Furthermore, the front panel is also fixed with a liquid supply port, a communication connector, a power connector, and an air switch. The liquid supply port is connected to the front end of the first liquid pipe of the heat exchanger. The power connector is connected to the power supply box via a wire. The communication connector and the air switch are connected to the multi-function controller via signal lines.

[0011] Furthermore, the multi-function controller is located above the heat exchanger, and the bottom of the multi-function controller is connected and fixed to the inside of the side plate via a controller bracket.

[0012] Furthermore, the oil outlet of the oil storage tank is lower than the oil inlet of the oil storage tank, so that the inlet of the oil pump can be immersed in the oil in the valve seat flow channel inside the water pump valve seat.

[0013] Furthermore, several oil pumps are connected in parallel, sharing a single valve seat inlet and outlet. The valve seat inlet is lower than the oil pump inlet to prevent air from being drawn in when the oil pump starts.

[0014] Furthermore, the compressor is fixed to the upper end of the compressor bracket, the compressor bracket is fixed to the bottom bracket by a threaded pressure ring, a compressor shock-absorbing pad is provided between the compressor bracket and the threaded pressure ring, and the bottom bracket is fixed to the upper end of the box bottom plate by bolts.

[0015] Furthermore, a power box cover is installed on the upper end of the power box with screws, and several power box brackets are fixed to the bottom end of the power box. The power box brackets are fixed to the upper end of the bottom plate of the box, and several power box cable holes are provided on the power box.

[0016] Furthermore, it also includes a water replenishment device, a second valve, a third valve, and a single battery pack. The inlet of the water replenishment device is connected to an exhaust ball valve via an outlet pipe. The outlet pipe is a transparent pipe, allowing observation of whether air bubbles are present in the outlet pipe from the outside. The outlet of the water replenishment device is connected to a replenishment ball valve via an inlet pipe. The second valve is installed on the inlet pipe between the outlet of the water replenishment device and the replenishment ball valve. The water inlet of the supply port, water inlet, and replenishment interface is connected to both ends of the fluid channel of the single battery pack via pipes. The third valve is installed on the connecting pipe between the water inlet and the single battery pack.

[0017] Furthermore, it also includes a water replenishment device, a second valve, a third valve, and multiple battery packs. The multiple battery packs are connected in parallel in the battery cabinet, with battery pack inlets and outlets at both ends of the battery cabinet. The inlet of the water replenishment device is connected to the exhaust ball valve via an outlet pipe. The outlet pipe is transparent, allowing observation of air bubbles from the outside. The outlet of the water replenishment device is connected to the replenishment ball valve via an inlet pipe. The second valve is installed on the inlet pipe between the outlet of the water replenishment device and the replenishment ball valve. The water inlet of the supply port, water inlet, and replenishment interface is connected to the battery pack inlet and battery pack outlet via pipes, respectively. The third valve is installed on the connecting pipe between the water inlet and the battery cabinet.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model discloses an immersion thermal management unit, which uses an oil pump to draw coolant to a heat exchanger for heat exchange with refrigerant to cool the coolant, and then flows through the battery pack for further cooling. During this process, the compressor operates to cool the battery, and with the assistance of a fan, releases heat into the air through the condenser to cool the coolant. Through the structural design of the battery immersion thermal management unit, it can stably carry out heat exchange and cooling for immersion liquids with high viscosity. It has reliable performance, high durability, long service life, and low maintenance difficulty.

[0020] 2. The present invention relates to an immersion thermal management unit, wherein an oil storage tank is installed in the cabinet to improve the performance of absorbing the thermal expansion and contraction of the coolant and better cope with the increase in the volume of the immersion liquid; at the same time, by combining with the water replenishment equipment, the unit does not need to be disassembled during later maintenance, and maintenance operations can be completed simply by externally connecting the liquid replenishment and venting, which greatly reduces the operation and maintenance costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the submersible thermal management unit in Embodiment 1. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall structure of the submersible thermal management unit in Embodiment 1. Figure 2 ;

[0023] Figure 3 This is a top view of the submersible thermal management unit in Embodiment 1 after the top plate has been removed;

[0024] Figure 4 This is a three-dimensional structural diagram of the submersible thermal management unit in Embodiment 1 after removing the top plate and side plates;

[0025] Figure 5This is a three-dimensional structural diagram of the immersion thermal management unit in Embodiment 1 after removing the top plate, side plates, and main box plate;

[0026] Figure 6 This is a three-dimensional structural diagram of the immersion thermal management unit in Embodiment 1 after removing the top plate, side plates, main box plate, power supply box, and multi-in-one controller.

[0027] Figure 7 This is a three-dimensional structural diagram of the immersion thermal management unit in Embodiment 1 after removing the top plate, side plates, main box plate, power supply box, multi-function controller, and oil tank.

[0028] Figure 8 This is a schematic diagram showing the connection between the compressor, heat exchanger, and liquid storage tank in the submerged thermal management unit in Embodiment 1;

[0029] Figure 9 This is a schematic diagram of the submersible thermal management unit after removing the water replenishment equipment, single battery pack, top plate, and filter screen in Embodiment 2;

[0030] Figure 10 This is a schematic diagram of the connection structure of the submersible thermal management unit in Embodiment 2;

[0031] Figure 11 This is a schematic diagram of the connection structure of the immersion thermal management unit in Embodiment 3.

[0032] In the diagram: 1. Water replenishment device; 2. Second valve; 3. Third valve; 6. Single battery pack; 10. Fan; 11. Main enclosure panel; 12. Side panel; 13. Top panel; 14. Filter screen; 15. Handle; 16. Rotary buckle; 111. Front enclosure panel; 112. Bottom enclosure panel; 113. Rear enclosure panel; 114. Fan mounting hole; 115. Retaining ring; 21. Liquid supply port; 22. Water inlet and replenishment interface; 23. Replenishment ball valve; 24. Communication connector; 25. Power connector; 26. Air switch; 31. Bottom bracket; 32. Compressor bracket; 33. Compressor shock absorber; 34. Compressor; 35. Second refrigerant pipe of heat exchanger; 36. Third refrigerant pipe. Heat exchanger 37; First refrigerant pipe of heat exchanger 38; Liquid receiver 39; Fourth refrigerant pipe 310; First liquid interface of heat exchanger 311; Second liquid interface of heat exchanger 312; First liquid pipe of heat exchanger 313; Exhaust ball valve 40; Oil tank 41; Oil tank inlet pipe 42; Flow channel inlet hose 43; Water pump valve seat 44; Oil pump 45; Second liquid pipe of heat exchanger 46; Condenser 48; Flow channel fixing seat 49; Controller bracket 51; Multi-function controller 52; Multiple battery packs 60; Power supply box 61; Power supply box bracket 62; Power supply box cover 63; Power supply box wiring hole 64. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0034] The purpose of this invention is to address the shortcomings of existing technologies by providing an immersion thermal management unit.

[0035] Example 1

[0036] This embodiment provides an immersion thermal management unit, referring to... Figures 1-8 As shown, the system includes a cabinet, fan 10, filter 14, compressor 34, heat exchanger 37, liquid storage tank 39, oil tank 41, water pump valve seat 44, oil pump 45, condenser 48, multi-function controller 52, and power supply box 61. The upper front end of the oil tank 41 has a vent hole connected to a vent ball valve 40. The lower front end of the oil tank 41 has an oil tank inlet and an oil tank outlet. The oil tank inlet is connected to the rear end of the oil tank inlet pipe 42. The front end of the oil tank inlet pipe 42 is connected to a water inlet and replenishment interface 22. The liquid inlet 22 is a dual-ended inlet, meaning that the water inlet and the liquid replenishment inlet converge and connect at the rear end to the front end of the oil tank inlet pipe 42. The liquid replenishment inlet is equipped with a liquid replenishment ball valve 23. In this embodiment, a built-in oil storage tank 41 is set in the cabinet. On the one hand, it is used to improve the performance of absorbing the thermal expansion and contraction of the coolant and better cope with the increase in the volume of the submerged liquid. On the other hand, by combining it with the water replenishment device 1, it is possible to complete the maintenance operation without disassembling the unit during later maintenance. Maintenance can be completed simply by connecting the external liquid replenishment and venting, which greatly reduces the operation and maintenance costs.

[0037] The water pump valve seat 44 is fixed in the cabinet by the flow channel fixing seat 49. The bottom two ends of the water pump valve seat 44 are provided with a valve seat flow channel inlet and a valve seat flow channel outlet. The top of the water pump valve seat 44 is provided with three mounting holes, each of which can be detachably installed with an oil pump 45. The oil outlet of the oil storage tank is connected to the valve seat flow channel inlet via a flow channel inlet hose 43. In this embodiment, the oil outlet of the oil storage tank is lower than the oil inlet of the oil storage tank, allowing the inlet of the oil pump 45 to be immersed in the oil in the valve seat flow channel within the water pump valve seat 44. The three oil pumps 45 are arranged in parallel, sharing a single valve seat flow channel inlet and outlet. The valve seat flow channel inlet is lower than the inlet of the oil pump 45 to prevent air intake when the oil pump 45 starts. Traditional water pump blades are made of resin, designed for the characteristics of ethylene glycol solutions, which is insufficient to meet the durability requirements of high-viscosity synthetic oils. In this embodiment, an oil pump 45 is used instead of a traditional water pump, which can better cope with the environment of synthetic oil coolant and meet the functional and durability requirements of the unit. The oil pump 45 in this embodiment can be the oil pump in the automotive power system. The flow rate and head of the existing vehicle oil pumps are relatively small, and a single oil pump cannot meet the performance requirements. Therefore, in this utility model, multiple mounting holes are provided on the top of a water pump valve seat 44 to install multiple oil pumps 45 used in parallel, thereby meeting the requirements of performance, size and cost.

[0038] The heat exchanger 37 has a first liquid inlet 311 and a second liquid inlet 312 on one side, and two refrigerant inlets on the other side.

[0039] The valve seat flow channel outlet is connected to the second liquid interface 312 of the heat exchanger via the second liquid pipe 46 of the heat exchanger, and the first liquid interface 311 of the heat exchanger is connected to the rear end of the first liquid pipe 313 of the heat exchanger.

[0040] The inlet of compressor 34 is connected to a refrigerant interface of heat exchanger 37 via a second refrigerant pipe 35. The outlet of compressor 34 is connected to the inlet of condenser 48 via a third refrigerant pipe 36. The outlet of condenser 48 is connected to the inlet of liquid receiver 39 via a fourth refrigerant pipe 310. The outlet of liquid receiver 39 is connected to the second refrigerant interface of heat exchanger 37 via a first refrigerant pipe 38. Condenser 48 is vertically fixed to the rear of the cabinet by a condenser bracket. A fan 10 is installed on the rear side of the cabinet next to condenser 48. A filter 14 is removably installed on the front side of the cabinet.

[0041] Both the multi-function controller 52 and the power supply box 61 are installed inside the cabinet. The multi-function controller 52 is located above the heat exchanger 37, and its bottom end is connected and fixed to the inside of the side plate 12 via a controller bracket 51. In this embodiment, the multi-function controller 52 uses a microcontroller from the prior art to control the operation of equipment such as the oil pump 45 and the fan 10. The specific control method is not described in detail in this utility model. The power supply box 61 in this embodiment is used to provide multiple low-voltage DC outputs. It takes 220V AC voltage as input and can stably output at least 24V and 5V DC voltage to power the equipment inside the cabinet.

[0042] Reference Figure 1 As shown, the cabinet includes a main cabinet 11, side panels 12 and a top panel 13. The side panels 12 are fixed to the left and right sides of the main cabinet 11 with screws, and the top panel 13 is fixed to the top of the main cabinet 11 with screws. Each side panel 12 has a handle 15 fixed to its front end for lifting and pulling the immersion thermal management unit.

[0043] Reference Figures 1-4 As shown, the main housing 11 includes a front housing 111, a bottom housing 112, and a rear housing 113. The bottom housing 112 is fixed to the bottom ends of the front housing 111 and the rear housing 113. The rear housing 113 has two fan mounting holes 114, and two fans 10 are respectively installed in the fan mounting holes 114. The front housing 111 has a mounting groove in the center, and a retaining ring 115 is provided along the edge of the mounting groove. Two rotating buckles 16 are installed on the front housing 111 by threaded engagement. The filter screen 14 is installed in the mounting groove in the center of the front housing 111, and the filter screen is secured by the retaining ring 115. The rear edge of filter screen 14 is blocked and secured by rotating buckle 16. When buckle 16 rotates 90 to 270 degrees, its lower baffle will separate from filter screen 14, making filter screen 14 easy and quick to remove. Filter screen 14 is used to filter the air entering the cabinet, ensuring the reliable operation of equipment such as compressor 34 in the submersible thermal management unit. With this detachable design, filter screen 14 is easy to replace, clean and maintain. It also facilitates the connection of the vent hole and vent ball valve 40 on the upper part of the external oil tank 41 when replenishing liquid and venting.

[0044] Reference Figures 1-4 As shown, the front panel 111 is also fixed with a liquid supply port 21, a communication connector 24, a power connector 25, and an air switch 26. The water inlet and liquid replenishment interface 22 is also fixed on the front panel 111. The liquid supply port 21 is connected to the front end of the first liquid pipe 313 of the heat exchanger. The power connector 25 is connected to the power box 61 through a wire. The communication connector 24 and the air switch 26 are connected to the multi-function controller 52 through signal lines.

[0045] Specifically, refer to Figure 8As shown, the compressor 34 is fixed to the upper end of the compressor bracket 32, and the compressor bracket 32 ​​is fixed to the bottom bracket 31 by a threaded pressure ring. A compressor shock-absorbing pad 33 is provided between the compressor bracket 32 ​​and the threaded pressure ring. The bottom bracket 31 is fixed to the upper end of the box bottom plate 112 by bolts to improve the shock absorption effect of the compressor 34 and reduce vibration and noise.

[0046] Specifically, refer to Figure 5 As shown, a power box cover 63 is installed on the upper end of the power box 61 by screws, and four power box brackets 62 are fixed at the bottom end of the power box 61. The power box brackets 62 are fixed on the upper end of the bottom plate 112 of the box, and a number of power box wire holes 64 are provided on the power box 61.

[0047] The coolant used in this embodiment for the submersible unit is synthetic oil, which has a viscosity several times that of a traditional ethylene glycol solution.

[0048] In this utility model, an immersion thermal management unit is operated by an oil pump 45 drawing coolant to a heat exchanger 37 to exchange heat with the refrigerant and cool the coolant. The coolant then flows through the battery pack to further cool it.

[0049] During this process, compressor 34 operates for cooling. As the refrigerant passes through condenser 48, with the assistance of fan 10, it releases heat into the air. After passing through liquid receiver 39, the refrigerant reaches heat exchanger 37, where it exchanges heat with the coolant to cool it down. Through the structural design of the battery immersion thermal management unit, it can stably carry out heat exchange and cooling operations for high-viscosity immersion liquids. It is reliable, durable, has a long service life, and is easy to maintain.

[0050] Example 2

[0051] Reference Figure 10 As shown, this embodiment provides an immersion thermal management unit. Based on the structure in Embodiment 1, it further includes a water replenishment device 1, a second valve 2, a third valve 3, and a single battery pack 6. The inlet end of the water replenishment device 1 is connected to the exhaust ball valve 40 through an outlet pipe. The outlet pipe is a transparent pipe, and whether there are air bubbles in the outlet pipe can be observed from the outside. The outlet end of the water replenishment device 1 is connected to the replenishment ball valve 23 through an inlet pipe. The second valve 2 is installed on the inlet pipe between the outlet end of the water replenishment device 1 and the replenishment ball valve 23. The water inlet of the supply port 21, the water inlet and the replenishment interface 22 are respectively connected to both ends of the fluid channel of the single battery pack 6 through pipes. The third valve 3 is installed on the connecting pipe between the water inlet and the single battery pack 6.

[0052] A method for controlling the replenishment and venting of a submerged thermal management unit, using the aforementioned submerged thermal management unit, includes the following steps:

[0053] Step 1: Connect the interfaces and pipes in the submersible heat management unit into place;

[0054] Step 2: Replenish the solution using water replenishment equipment 1:

[0055] First, open the second valve 2, the liquid replenishment ball valve 23, and the air vent ball valve 40 in sequence, and start the water replenishment device 1 to replenish the liquid. The liquid replenishment pressure is 0.8 bar to 1.5 bar.

[0056] When liquid is found to appear in the outlet pipe connected to the vent ball valve 40 during the replenishment process, it indicates that the oil tank 41 is full. At this time, the vent ball valve 40 should be closed.

[0057] Step 3: Replenish fluid and expel air;

[0058] Open the third valve 3 until liquid replenishment is carried out until liquid is found in the pipe connected to the third valve 3;

[0059] Turn on the oil pump 45 and run it at 15% to 25% power. Initially, the liquid inside the pipe connected to the third valve 3 is a milky white gas-liquid mixture because the oil pump 45 is running at high speed and there is air in the system. Finally, the discharged liquid is clean and free of air. At this time, the venting is finished.

[0060] Step 4: Close the third valve 3, the replenishment ball valve 23, the second valve 2, and the water replenishment device 1 in sequence, and then remove the equipment.

[0061] This method is applicable to the replenishment and venting of liquid in a submerged thermal management unit operating in a single battery pack 6. It is simple to operate and easy to use, and does not require disassembly of the equipment inside the submerged thermal management unit.

[0062] Example 3

[0063] Reference Figure 11 As shown, this embodiment provides an immersion thermal management unit. Based on the structure in Embodiment 1, it further includes a water replenishment device 1, a second valve 2, a third valve 3, and multiple battery packs 60. The multiple battery packs 60 are arranged in parallel in a battery cabinet. The battery cabinet has battery pack inlets and outlets at both ends. The inlet of the water replenishment device 1 is connected to the exhaust ball valve 40 through an outlet pipe. The outlet pipe is a transparent pipe, and whether there are air bubbles in the outlet pipe can be observed from the outside. The outlet of the water replenishment device 1 is connected to the replenishment ball valve 23 through an inlet pipe. The second valve 2 is installed on the inlet pipe between the outlet of the water replenishment device 1 and the replenishment ball valve 23. The water inlet of the supply port 21 and the water inlet and replenishment interface 22 are connected to the battery pack inlet and battery pack outlet through pipes, respectively. The third valve 3 is installed on the connecting pipe between the water inlet and the battery cabinet.

[0064] A method for controlling the replenishment and venting of a submerged thermal management unit, using the aforementioned submerged thermal management unit, includes the following steps:

[0065] Step 1: Connect the interfaces and pipes in the submersible heat management unit into place;

[0066] Step 2: Replenish the solution using water replenishment equipment 1:

[0067] First, open the second valve 2, the liquid replenishment ball valve 23, and the air vent ball valve 40 in sequence, and start the water replenishment device 1 to replenish the liquid. The liquid replenishment pressure is 0.8 bar to 1.5 bar.

[0068] When liquid is found to appear in the outlet pipe connected to the vent ball valve 40 during the replenishment process, it indicates that the oil tank 41 is full. At this time, the vent ball valve 40 should be closed.

[0069] Step 3: Replenish fluid and expel air;

[0070] Open the third valve 3 until liquid replenishment is carried out until liquid is found in the pipe connected to the third valve 3;

[0071] Turn on the oil pump 45 and run it at 75% to 85% power to make the air inside the entire system of the electrical cabinet flow together with the liquid working medium. Initially, the liquid inside the pipe connected to the third valve 3 is a milky white gas-liquid mixture because the oil pump 45 is running at high speed and there is air inside the system. Finally, the discharged liquid without air is clean, and the venting ends.

[0072] Step 4: Close the third valve 3, the replenishment ball valve 23, the second valve 2, and the water replenishment device 1 in sequence, and then dismantle the equipment.

[0073] This method is applicable to the replenishment and venting of liquid in immersion thermal management units operating with multiple battery packs 60. It is simple to operate and easy to use, and does not require disassembly of the equipment inside the immersion thermal management unit.

[0074] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A submersible thermal management unit, characterized in that: Includes a cabinet, fan (10), filter (14), compressor (34), heat exchanger (37), liquid tank (39), oil tank (41), water pump valve seat (44), oil pump (45), condenser (48), all-in-one controller (52), and power supply box (61). The oil storage tank (41) is provided with an exhaust port at the upper front end, and an exhaust ball valve (40) is connected to the exhaust port. The lower front end of the oil storage tank (41) is provided with an oil storage tank inlet and an oil storage tank outlet. The oil storage tank inlet is connected to the rear end of the oil tank inlet pipe (42). The front end of the oil tank inlet pipe (42) is connected to a water inlet and liquid replenishment interface (22). A liquid replenishment ball valve (23) is installed on the liquid replenishment interface. The water pump valve seat (44) is fixed in the cabinet by the flow channel fixing seat (49). The bottom two ends of the water pump valve seat (44) are provided with valve seat flow channel inlet and valve seat flow channel outlet. The top of the water pump valve seat (44) is provided with several mounting holes. Each mounting hole can be detachably installed with an oil pump (45). The oil outlet of the oil storage tank is connected to the valve seat flow channel inlet by the flow channel inlet hose (43). The heat exchanger (37) is provided with a first liquid inlet (311) and a second liquid inlet (312) on one side, and two refrigerant inlets on the other side. The valve seat flow channel outlet is connected to the second liquid interface (312) of the heat exchanger via the second liquid pipe (46) of the heat exchanger, and the first liquid interface (311) of the heat exchanger is connected to the rear end of the first liquid pipe (313) of the heat exchanger. The inlet end of the compressor (34) is connected to a refrigerant interface of the heat exchanger (37) through a second refrigerant pipe (35), and the outlet end of the compressor (34) is connected to the inlet end of the condenser (48) through a third refrigerant pipe (36). The outlet end of the condenser (48) is connected to the inlet end of the liquid storage tank (39) through the fourth refrigerant pipe (310), and the outlet end of the liquid storage tank (39) is connected to the second refrigerant interface of the heat exchanger (37) through the first refrigerant pipe (38). The condenser (48) is vertically fixed to the rear of the cabinet by a condenser bracket. A fan (10) is installed on the rear side of the cabinet next to the condenser (48). A filter (14) is detachably installed on the front side of the cabinet. The all-in-one controller (52) and power supply box (61) are both installed inside the cabinet.

2. The submersible thermal management unit according to claim 1, characterized in that: The cabinet includes a main cabinet (11), side panels (12) and a top panel (13). The side panels (12) are fixed to the left and right sides of the main cabinet (11) by screws, and the top panel (13) is fixed to the top of the main cabinet (11) by screws. Each side panel (12) has a handle (15) fixed to its front end. The main box panel (11) includes a front box panel (111), a bottom box panel (112), and a rear box panel (113). The bottom box panel (112) is fixed to the bottom ends of the front box panel (111) and the rear box panel (113). The rear box panel (113) is provided with a plurality of fan mounting holes (114), and the fan (10) is installed in the fan mounting holes (114). The front panel (111) has a mounting groove in the center, and a retaining ring (115) is provided along the edge of the mounting groove. Several rotating buckles (16) are installed on the front panel (111) by threaded engagement. The filter screen (14) is installed in the mounting groove in the center of the front panel (111) and is secured by rotating buckle (16).

3. The submersible thermal management unit according to claim 2, characterized in that: The front panel (111) is also fixed with a liquid supply port (21), a communication connector (24), a power connector (25), and an air switch (26). The liquid supply port (21) is connected to the front end of the first liquid pipe (313) of the heat exchanger. The power connector (25) is connected to the power box (61) through a wire. The communication connector (24) and the air switch (26) are connected to the multi-function controller (52) through signal lines.

4. The submersible thermal management unit according to claim 3, characterized in that: The multi-function controller (52) is located above the heat exchanger (37), and the bottom of the multi-function controller (52) is connected and fixed to the inside of the side plate (12) through the controller bracket (51).

5. The submersible thermal management unit according to claim 4, characterized in that: The oil outlet of the oil storage tank is lower than the oil inlet of the oil storage tank, so that the inlet of the oil pump (45) can be immersed in the oil in the valve seat flow channel inside the water pump valve seat (44).

6. The submersible thermal management unit according to claim 5, characterized in that: Several oil pumps (45) are connected in parallel and share a valve seat flow channel inlet and valve seat flow channel outlet. The valve seat flow channel inlet is lower than the inlet of the oil pump (45) to prevent air from being sucked in when the oil pump (45) starts.

7. The submersible thermal management unit according to claim 6, characterized in that: The compressor (34) is fixed on the upper end of the compressor bracket (32), the compressor bracket (32) is fixed on the bottom bracket (31) by a threaded pressure ring, a compressor shock-absorbing pad (33) is provided between the compressor bracket (32) and the threaded pressure ring, and the bottom bracket (31) is fixed on the upper end of the box bottom plate (112) by bolts.

8. The submersible thermal management unit according to claim 7, characterized in that: The power box (61) is fitted with a power box cover (63) by screws on the upper end. Several power box brackets (62) are fixed at the bottom end of the power box (61). The power box brackets (62) are fixed on the upper end of the bottom plate (112). Several power box wire holes (64) are provided on the power box (61).

9. The submersible thermal management unit according to claim 8, characterized in that: It also includes a water replenishment device (1), a second valve (2), a third valve (3) and a single battery pack (6). The inlet of the water replenishment device (1) is connected to the exhaust ball valve (40) through the outlet pipe. The outlet pipe is a transparent pipe, and it is possible to observe from the outside of the pipe whether there are air bubbles in the outlet pipe. The outlet end of the water replenishment device (1) is connected to the replenishment ball valve (23) through the inlet pipe, and the second valve (2) is installed on the inlet pipe between the outlet end of the water replenishment device (1) and the replenishment ball valve (23). The water inlet of the liquid supply port (21) and the water inlet and replenishment port (22) are connected to the two ends of the fluid channel of the single battery pack (6) through pipes respectively, and the third valve (3) is installed on the connecting pipe between the water inlet and the single battery pack (6).

10. The submersible thermal management unit according to claim 8, characterized in that: It also includes a water replenishment device (1), a second valve (2), a third valve (3), and multiple battery packs (60). Multiple battery packs (60) are connected in parallel in the battery cabinet, and the battery cabinet has battery pack liquid inlet and battery pack liquid outlet at both ends; The inlet end of the water replenishment device (1) is connected to the exhaust ball valve (40) through the outlet pipe. The outlet pipe is a transparent pipe, and it is possible to observe from the outside of the pipe whether there are air bubbles in the outlet pipe. The outlet end of the water replenishment device (1) is connected to the replenishment ball valve (23) through the inlet pipe, and the second valve (2) is installed on the inlet pipe between the outlet end of the water replenishment device (1) and the replenishment ball valve (23). The water inlet of the liquid supply port (21) and the water inlet and replenishment port (22) are connected to the liquid inlet of the battery pack and the liquid outlet of the battery pack respectively through pipes. The third valve (3) is installed on the connecting pipe between the water inlet and the battery box cabinet.

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