An underwater heat dissipation system for battery packs

Abstract

The present application relates to an underwater heat dissipation system for a battery pack, and relates to the technical field of battery heat dissipation; it includes a sealed cabin, in which a battery pack is placed; it also includes a liquid pump and a cooling pipe, one end of the cooling pipe is connected to the inlet of the liquid pump, and the other end is connected to a cooling medium source for supplying cooling medium; the cooling pipe is divided into a heat dissipation pipe and a heat absorption pipe at a position away from the liquid pump and the cooling medium source, the heat dissipation pipe passes through the sealed cabin and is located outside the sealed cabin and is used to contact the water body outside the sealed cabin, and the heat absorption pipe is in contact with the battery pack for heat exchange with the battery pack; the present application is used to achieve heat dissipation of a battery pack used for underwater work.

Description

Technical Field

[0001] The present application relates to the technical field of battery heat dissipation, and in particular to an underwater heat dissipation system for a battery pack. Background Art

[0002] A battery pack is a power supply structure formed by connecting multiple cells in series and parallel to meet the required capacity and voltage. Battery cells require very high operating temperatures, generally between 0 and 50°C. The mainstream battery cells on the market are made of lithium iron phosphate, which easily heats up during operation, causing high temperatures and potentially shortening the battery life or causing fires due to overheating. Once the cells are grouped, they are encapsulated in a sealed cavity. This enclosed cavity hinders heat dissipation during operation, allowing heat to accumulate inside. Excessive temperatures can cause the battery to malfunction, shorten its lifespan, or even catch fire.

[0003] Therefore, there is an urgent need to study a structure that can achieve heat dissipation of the battery pack, especially a heat dissipation structure for battery packs used in special circumstances (such as underwater), so that the battery can always operate in a suitable temperature environment, ensuring the maximum performance of the battery cell and guaranteeing the battery life. Summary of the Invention

[0004] In order to achieve heat dissipation of the battery pack and ensure that the battery operates in a suitable temperature environment, the present application provides an underwater heat dissipation system for the battery pack.

[0005] This application provides an underwater heat dissipation system for a battery pack, which adopts the following technical solutions:

[0006] A battery pack underwater heat dissipation system includes a sealed cabin with a battery pack placed in the sealed cabin; a liquid pump and a cooling pipe, one end of the cooling pipe is connected to the liquid pump inlet, and the other end is connected to a cooling medium source for supplying cooling medium; the cooling pipe is divided into a heat dissipation pipe and a heat absorption pipe at a portion away from the liquid pump and the cooling medium source, the heat dissipation pipe passes through the sealed cabin and is located outside the sealed cabin and is used to contact the water body outside the sealed cabin, and the heat absorption pipe is in contact with the battery pack for heat exchange with the battery pack.

[0007] By adopting the above-mentioned technical solution, the present application provides a heat dissipation system for dissipating heat from a battery pack working underwater. Specifically, the battery pack is placed in a sealed cabin, and the sealed cabin and the battery pack are placed underwater together. When the battery pack needs to be dissipated, a liquid pump is used to extract the cooling medium through the cooling pipe to contact the battery pack to achieve heat exchange with the battery pack. In this process, the heat dissipation pipe contained in the cooling pipe will contact the water outside the sealed cabin to further cool the cooling medium with the help of the water temperature, thereby ensuring the heat exchange and heat dissipation effect of the cooling medium on the battery pack, and improving the situation where the working performance of the battery pack is affected by the temperature rise during operation.

[0008] Preferably, it further comprises a ring plate and a sliding member, wherein the ring plate is sleeved on the outside of the heat dissipation tube and contacts the peripheral wall of the heat dissipation tube, and the sliding member is used to drive the ring plate to slide back and forth along the length direction of the heat dissipation tube.

[0009] By adopting the above technical solution, since the heat dissipation pipe needs to be in contact with the water body to use the water body problem to further reduce the temperature of the cooling medium in the cooling pipe, and combined with the working scenario of the underwater battery pack, the water body outside the sealed cabin may be sea water or river water, etc., so impurities are likely to exist in the water body, affecting the heat exchange effect between the heat dissipation pipe wall and the water body. For example, water impurities accumulate on the surface of the heat dissipation pipe wall, thereby hindering the direct contact between the heat dissipation pipe wall and the water body. For this reason, this application specially provides a sliding part and a ring plate, and the sliding part drives the ring plate to slide along the length direction of the heat dissipation pipe, so that the ring plate scrapes the heat dissipation pipe wall during movement, reduces water impurities on the surface of the heat dissipation pipe wall, and ensures the heat exchange effect between the heat dissipation pipe wall and the water body.

[0010] Preferably, the heat dissipation pipe includes two branches that are interconnected and symmetrically arranged on the periphery of the sealed cabin, and the two branches are connected to the liquid pump and the cooling medium source respectively away from the interconnected part; a spoiler and a spoiler are provided outside the sealed cabin and between the two branches, and the spoiler is used to drive the spoiler to move back and forth in a direction close to or away from the branch.

[0011] By adopting the above technical solution, the spoiler is set to accelerate the flow rate of the water around the heat dissipation pipe. On the one hand, it can assist in impacting impurities on the heat dissipation pipe wall and reduce the retention of water impurities on the heat dissipation pipe wall. On the other hand, it can optimize the heat exchange effect on the heat dissipation pipe wall through the flowing water.

[0012] Preferably, the spoiler includes a slide plate, a reset component, a protrusion and a docking protrusion; the protrusion and the ring plate are arranged on the slide plate, and the slide plate is slidably connected to the outer wall of the sealed cabin along the length direction of the heat dissipation pipe; the docking protrusion is arranged on the side wall of the spoiler, and the docking protrusion is located on the sliding path of the protrusion when the protrusion slides with the slide plate, so that when the protrusion contacts the docking protrusion, the spoiler moves in a direction away from the protrusion, and the reset component is used to drive the spoiler to move in a direction close to the protrusion.

[0013] By adopting the above technical solution, in the process of the ring plate being driven to slide by the sliding member, the slide plate slides together, and drives the protrusion to push the docking protrusion during the sliding process, so that the docking protrusion and the spoiler are pushed and move in the direction away from the protrusion. When the protrusion slides and disengages from the docking protrusion, the reset component is used to drive the spoiler to move in the opposite direction and reset, so as to realize the reciprocating sliding of the spoiler.

[0014] Preferably, a water-absorbing flexible gasket is provided on the inner wall of the ring plate facing the heat dissipation pipe, and the water-absorbing flexible gasket is fitted between the outer wall of the heat dissipation pipe and the inner wall of the ring plate.

[0015] By adopting the above technical solution, the water-absorbing flexible gasket can absorb water so that the water is in contact with the outer wall of the heat dissipation pipe to a greater extent. On the basis of ensuring the cleaning ability of the water-absorbing flexible gasket on the heat dissipation pipe wall, the heat exchange effect between the heat dissipation pipe and the water is further optimized.

[0016] Preferably, the outer wall of the ring plate is hinged to the surface of the slide plate, and the ring plate is movably mounted on the outside of the heat dissipation pipe with the hinge point as the center. When the spoiler moves away from the bump, the ring plate is located on the moving path of the spoiler.

[0017] By adopting the above technical solution, during the movement of the spoiler, since the ring plate is located on the movement path of the spoiler, the ring plate can be squeezed by the movement of the spoiler, so that the ring plate swings around the hinge point. The water-absorbing flexible gasket will be squeezed by the ring plate and the heat pipe during the swinging process of the ring plate and deformed and discharge the water it has absorbed, further optimizing the contact between the water body and the peripheral wall of the heat pipe and the heat exchange effect.

[0018] Preferably, a hinge shaft is provided at the hinge position between the ring plate and the slide plate, and the ring plate swings relative to the slide plate through the hinge shaft. A torsion spring is provided outside the hinge shaft, and the torsion spring is connected between the slide plate and the ring plate.

[0019] By adopting the above technical solution, the torsion spring is provided to realize the swing reset of the ring plate relative to the slide plate, that is, the reciprocating swing is realized conveniently.

[0020] Preferably, it also includes an anti-pollution cover and a water pump, the anti-pollution cover is arranged on the periphery of the two branch pipes, and the side wall of the anti-pollution cover is provided with a water hole; each of the branch pipes corresponds to a spoiler, and the spoiler is slidably connected to the inner side of the anti-pollution cover, and the two spoilers and the side wall of the anti-pollution cover together enclose a water passage cavity, the water pump is arranged on the periphery of the sealed cabin, the water inlet end of the water pump is connected to the water body, and the water outlet end of the water pump is connected to the water passage cavity through the end of the water passage cavity.

[0021] By adopting the above technical solution, water is pumped into the water cavity by a water pump, so that the water impacts the water cavity, and then part of the water is impacted and flows out of the water cavity, and flows out of the protective cover around the branch pipe. This process further improves the fluidity of the water around the branch pipe, and can use the water flowing to the outside of the anti-fouling cover to impact the water permeable hole, thereby achieving dredging of the water permeable hole; and the setting of the protective cover and the water permeable hole can further intercept impurities in the water and reduce the amount of impurities retained on the wall of the branch pipe.

[0022] Preferably, a temperature sensor is provided on the side wall of the ring plate facing the heat dissipation pipe, the detection end of the temperature sensor is always in contact with the wall of the heat dissipation pipe, the temperature sensor is electrically connected to a controller, and the controller is electrically connected to the liquid pump for controlling the start and stop and the extraction speed of the liquid pump according to the temperature data detected by the temperature sensor.

[0023] By adopting the above technical solution, during the sliding of the ring plate along the length direction of the heat dissipation pipe, the temperature sensor detects the wall temperature of the heat dissipation pipe in real time as the ring plate slides. The controller can control the pumping speed of the coolant in the heat dissipation pipe according to the temperature result detected by the temperature sensor. For example, when the difference between the wall temperature of the heat dissipation pipe and the pre-set standard temperature is large and higher than the standard temperature, the pumping pump can be controlled to reduce the pumping speed of the cooling medium, thereby extending the heat exchange time between the cooling medium and the water body in the heat dissipation pipe.

[0024] Preferably, the sliding member is controlled by a controller, which is used to determine the temperature change rate of all heat pipe sections based on the temperature data at each preset heat pipe section of the heat pipe detected by the temperature sensor; and is also used to compare the temperature change rate at each heat pipe section with the corresponding preset temperature change rate and calculate the difference. If there is a target heat pipe section and the corresponding difference is higher than the preset difference, the controller controls the sliding member to drive the ring plate to slide back and forth at the target heat pipe section.

[0025] By adopting the above technical solution, the temperature data detected by the temperature sensor is analyzed. Specifically, the heat exchange effect between the heat dissipation pipe and the water body is reflected by analyzing the temperature change rate at different pipe sections, and then it is determined whether there is a target heat dissipation pipe section that needs to be cleaned. If so, the sliding member is controlled to drive the ring plate to centrally clean the target heat dissipation pipe section.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. This application provides a heat dissipation system for dissipating heat from a battery pack operating underwater. Specifically, the battery pack is placed in a sealed cabin, and the sealed cabin and battery pack are placed underwater together. When the battery pack needs to dissipate heat, a liquid pump is used to pump a cooling medium through a cooling pipe into contact with the battery pack to achieve heat exchange with the battery pack. During this process, the heat dissipation pipe contained in the cooling pipe will contact the water outside the sealed cabin, and the water temperature will be used to further cool the cooling medium, thereby ensuring the heat exchange and heat dissipation effect of the cooling medium on the battery pack, and improving the situation where the battery pack's operating performance is affected by the increase in temperature during operation.

[0028] 2. Since the heat dissipation pipe needs to be in contact with the water body to use the water body to further reduce the temperature of the cooling medium in the cooling pipe, and combined with the working scenario of the underwater battery pack, the water body outside the sealed cabin may be sea water or river water, etc., so impurities are likely to exist in the water body, affecting the heat exchange effect between the heat dissipation pipe wall and the water body. For example, water impurities accumulate on the surface of the heat dissipation pipe wall, thereby hindering the direct contact between the heat dissipation pipe wall and the water body. For this reason, this application specially provides a sliding part and a ring plate, and the sliding part drives the ring plate to slide along the length direction of the heat dissipation pipe, so that the ring plate scrapes the heat dissipation pipe wall during movement, reducing water impurities on the surface of the heat dissipation pipe wall and ensuring the heat exchange effect between the heat dissipation pipe wall and the water body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of an underwater heat dissipation system for a battery pack disclosed in Example 1 of the present application.

[0030] Figure 2 It is a schematic diagram of the internal structure of the sealed cabin embodied in Example 1 of the present application.

[0031] Figure 3 This is a schematic diagram of Example 1 of the present application used to illustrate the connectivity between the battery pack and the cooling medium source of the liquid pump.

[0032] Figure 4 It is a power supply connection circuit diagram used to reflect the electrical connection relationship between the battery pack and the load in Example 1 of the present application, as well as a schematic diagram used to reflect the water flow route of the cooling pipe.

[0033] Figure 5 This is a structural schematic diagram of an underwater heat dissipation system for a battery pack disclosed in Example 2 of the present application.

[0034] Figure 6 It is a cross-sectional view used to illustrate the internal structure of the anti-fouling cover in Example 2 of the present application.

[0035] Figure 7 yes Figure 6 Enlarged schematic diagram of point A in the middle.

[0036] Figure 8 This is a structural block diagram of the logical relationship between the controller, temperature sensor, and liquid pump used in Example 2 of the present application.

[0037] Explanation of the accompanying symbols: 1. Sealed cabin; 11. Rack; 12. Battery pack; 13. Liquid pump; 14. Cooling medium source; 15. Air pipe; 16. Sealing gasket; 17. Water pump; 2. Cooling pipe; 21. Heat dissipation pipe; 211. Branch pipe; 22. Heat absorption pipe; 3. Anti-fouling cover; 31. Water permeable hole; 32. Spoiler; 33. Water passage cavity; 4. Ring plate; 41. Water-absorbing flexible gasket; 5. Sliding part; 51. Magnet block; 52. Ring; 53. Gear; 55. Motor; 6. Spoiler; 61. Slide plate; 62. Reset component; 63. Bump; 64. Docking protrusion; 7. Temperature sensor; 8. Controller. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-8 This application is described in further detail.

[0039] Example 1

[0040] Example 1 of the present application discloses an underwater heat dissipation system for a battery pack. Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The battery pack underwater cooling system includes a sealed cabin 1, a frame 11 is provided in the sealed cabin 1, and a plurality of battery packs 12 are installed on the frame 11 in series. Figure 3 The battery pack 12 is electrically connected to the load in a manner to achieve electrical connection and is connected to the load. The wiring harness for electrically connecting the battery pack 12 to the load passes through the sealed cabin 1 and extends to the periphery of the sealed cabin 1 so as to be connected to the load outside the sealed cabin 1. A liquid pump 13 and a cooling pipe 2 are also provided on the frame 11, and also includes a cooling medium source 14 for storing a cooling medium. The cooling medium in this embodiment is specifically a coolant, and the cooling medium source 14 can be specifically a liquid storage tank containing coolant. The liquid pump 13 and the cooling medium source 14 are connected through the cooling pipe 2 to form a closed loop, and the cooling pipe 2 is in contact with the battery pack 12. In this embodiment of the application, the cooling pipe 2 can be passed through the inner wall of the battery pack 12 so that the cooling pipe 2 is closed and in contact with the surface of the battery cell in the battery pack 12, thereby achieving heat dissipation for the battery pack 12 through the coolant flowing through the cooling pipe 2.

[0041] Specifically, refer to Figure 2 、 Figure 3 and Figure 4The cooling pipe 2 includes a heat dissipation pipe 21 and a heat absorption pipe 22. The heat dissipation pipe 21 is located outside the sealed cabin 1, and the heat absorption pipe 22 is located inside the sealed cabin 1. The heat absorption pipe 22 is in contact with the battery pack 12 and realizes heat exchange with the battery pack 12; one end of the heat absorption pipe 22 is connected to the outlet of the liquid pump 13, and the other end of the heat absorption pipe 22 is connected to the cooling medium source 14. The heat dissipation pipe 21 passes through the sealed cabin 1 and is located on the periphery. The heat dissipation pipe 21 is arranged circumferentially along the sealed cabin 1, and the heat dissipation pipe 21 specifically includes two mutually connected and symmetrically arranged branches 211, one end of which is connected to the cooling medium source 14, and the other end of which is connected to the inlet of the liquid pump 13. In this embodiment, the heat absorption pipe 22 is arranged circumferentially along the sealed cabin 1. Figure 4 Arrows show the flow path of the coolant.

[0042] Reference Figure 1 and Figure 2 The end of the sealed cabin 1 is also connected to an air pipe 15, which is connected to an air pump and an inert gas source. The air pump pumps inert gas (such as nitrogen) into the sealed cabin 1, filling the cabin 1 with inert gas to a standard atmospheric pressure. Sealing gaskets 16, which may be made of rubber, are installed at the end of the sealed cabin 1 and at the location where the heat absorption tube 22 passes through. The inert gas has a fire-extinguishing effect, providing an inert gas environment for the high-risk battery pack 12, preventing fires and safety accidents.

[0043] The implementation principle of an underwater heat dissipation system for a battery pack disclosed in Example 1 of the present application is as follows: the battery pack 12, the liquid pump 13, and the cooling medium source 14 are assembled to the corresponding positions of the rack 11 as required, the coolant is connected to the corresponding positions, and the wire connections between the battery packs 12 and between the battery packs 12 and the load are completed; finally, the rack 11 is pushed into the sealed cabin 1 and the sealed cabin 1 is closed; nitrogen is then introduced from one end of the sealed cabin 1 through the air pipe 15, and air is extracted from the other end of the sealed cabin 1, finally achieving the sealing of the sealed cabin 1; then the assembled sealed cabin 1 is sunk into the water body and installed on a preset foundation in the water body, and it is ensured that the heat dissipation pipe 21 is immersed in the water body.

[0044] The coolant in the cooling medium source 14 is pumped into the heat absorption tube 22 through the heat dissipation tube 21 by the liquid pump 13, and the battery pack 12 is heat exchanged with the coolant in the heat absorption tube 22. In this process, the heat dissipation tube 21 contacts the water body to realize heat exchange, so that the water body further cools the wall of the heat dissipation tube 21 and the coolant in the heat dissipation tube 21.

[0045] Example 2

[0046] The difference between Example 2 of the present application and Example 1 is that: Figure 5 、 Figure 6 and Figure 7 , further comprising an anti-pollution cover 3, which is disposed on the outer wall of the sealed cabin 1 and covers the periphery of the heat dissipation pipe 21; water permeable holes 31 are formed in the sidewalls and top wall of the anti-pollution cover 3, and spoilers 32 are disposed on the inner wall of the anti-pollution cover 3. The spoilers 32 are arranged in a one-to-one correspondence with the branch pipes 211, and two spoilers 32 are located between the two branch pipes 211. The spoilers 32 are slidably connected to the inner wall of the anti-pollution cover 3, and the two spoilers 32 and the anti-pollution cover 3 together enclose a water passage 33. During the sliding process, the spoilers 32 slide toward or away from the corresponding branch pipes 211. A water pump 17 is also installed on the surface of the sealed cabin 1. The water inlet end of the water pump 17 is connected to the water body outside the sealed cabin 1, and the water outlet end of the water pump 17 is connected to the water through the water cavity 33 through the end of the water through the cavity 33. The water pump 17 is used to pump part of the water body outside the sealed cabin 1 into the water through the cavity 33, so that part of the water body flows from the joint between the spoiler 32 and the sealed cabin 1 to the periphery of the branch pipe 211, and is impacted by the water flow to penetrate the water permeable hole 31 and flow to the periphery of the anti-fouling cover 3, thereby increasing the flow speed of the water body outside the branch pipe 211 and achieving the dredging of the water permeable hole 31.

[0047] The device further comprises a ring plate 4, a sliding member 5, and a spoiler 6. The ring plates 4 are arranged in a one-to-one correspondence with the branch pipes 211 and are sleeved on the corresponding branch pipes 211. A water-absorbing flexible gasket 41 is provided between the ring plate 4 and the branch pipe 211. The water-absorbing flexible gasket 41 can be made of sponge and is fixedly connected to the inner wall of the ring plate 4 and fits against the peripheral wall of the branch pipe 211. The spoiler 6 includes a slide plate 61. The two ring plates 4 rotate on the surface of the slide plate 61 via a hinge shaft. A torsion spring is sleeved on the outside of the hinge shaft and connected between the ring plate 4 and the slide plate 61.

[0048] The slide 61 is specifically made of a magnetic material, and the sliding member 5 is used to drive the slide 61 to slide along the circumference of the sealed cabin 1 and be connected to the outer wall of the sealed cabin 1. The sliding member 5 is arranged inside the sealed cabin 1, and the sliding member 5 specifically includes a magnet block 51 for magnetically adsorbing the slide 61, a ring 52 connected to the side wall of the magnet block 51, and a gear 53 and a motor 55; the motor 55 is installed on the inner wall of the sealed cabin 1, and the driving shaft of the motor 55 passes through the rotation center of the gear 53, the ring 52 is a circular ring arranged concentrically with the sealed cabin 1, and the side wall of the ring 52 is provided with a tooth groove along its circumference that meshes with the gear 53.

[0049] When the projection 63 is rotated to the position of disengaging the docking protrusion 64, the two spoilers 32 will move toward each other under the elastic force of the reset component 62, thereby increasing the flow speed of the water body in the anti-fouling cover 3. When the torsion spring is not deformed, the ring plate 4 is located on the sliding path of the spoiler 32 when it slides toward the corresponding branch pipe 211. When the ring plate 4 is resisted by the movement of the spoiler 32, it swings around the hinge axis, that is, moves away from the spoiler 32. When the two spoilers 32 move toward each other to reset, the ring plate 4 will swing back to the direction close to the spoiler 32 under the action of the torsion spring.

[0050] A temperature sensor 7 is provided on the inner wall of the ring plate 4 near the hinge axis. The temperature sensor 7 is always attached to the outer wall of the corresponding branch pipe 211 of the ring plate 4. The temperature sensor 7 is electrically connected to a controller 8, and the liquid pump 13 and the sliding member 5 are both controlled by the controller 8. The controller 8 is used to control the start and stop of the liquid pump 13 and the extraction speed based on the temperature data detected by the temperature sensor 7. Specifically, the controller 8 pre-divides the heat pipe 21 into a plurality of heat pipe 21 segments and presets a temperature threshold for each heat pipe 21 segment. The controller 8 is used to determine the position of the ring plate 4 on the heat pipe 21 based on the sliding control of the sliding member 5 on the ring plate 4. The controller 8 receives temperature data from each heat pipe 21 segment and compares the temperature data for each heat pipe 21 segment with the preset temperature threshold. If the temperature data exceeds the preset temperature threshold, the controller 8 controls the liquid pump 13 to suspend extraction or reduce the extraction speed (i.e., reduce the valve opening at the inlet of the liquid pump 13) to extend the residence time of the cooling pipe 2 in the heat pipe 21.

[0051] In addition, the controller 8 is also used to obtain the temperature data of each heat pipe 21 section and calculate the temperature change rate of each heat pipe 21 section, where the temperature change rate = |the temperature of the coolant flowing into the heat pipe 21 section at the starting point - the temperature data of the coolant flowing out of the heat pipe 21 section at the end point| / the flow time. Then, based on a preset correspondence table, the temperature change rate of each heat pipe 21 section is compared with the corresponding preset temperature change rate and the difference is calculated. If a target heat pipe 21 section exists and the temperature change rate is less than the corresponding preset temperature change rate and the difference is greater than the preset difference, the controller 8 controls the sliding member 5 to drive the ring plate 4 to slide back and forth at the target heat pipe 21 section. The correspondence table stores the position of each heat pipe 21 section, the rotation direction and rotation time required for the sliding member 5 to drive the ring plate 4 to rotate to the corresponding heat pipe 21 section, and the preset temperature change rate for the corresponding heat pipe 21 section.

[0052] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A battery pack underwater heat dissipation system, characterized by: The invention comprises a sealed cabin (1), wherein a battery pack (12) is placed in the sealed cabin (1); further comprising a liquid pump (13), a cooling pipe (2), and a cooling medium source (14) for supplying a cooling medium; the cooling pipe (2) is divided into a heat dissipation pipe (21) and a heat absorption pipe (22); the heat absorption pipe (22) is in contact with the battery pack (12) for heat exchange with the battery pack (12); one end of the heat absorption pipe (22) is connected to the outlet of the liquid pump (13), and the other end of the heat absorption pipe (22) is connected to the cooling medium source (14); The heat dissipation pipe (21) passes through the sealed cabin (1) and is located outside the sealed cabin (1) and is used to contact the water body outside the sealed cabin (1). The heat dissipation pipe (21) includes two branch pipes (211) that are interconnected and symmetrically arranged outside the sealed cabin (1), wherein the end of one branch pipe (211) is connected to the cooling medium source (14), and the end of the other branch pipe (211) is connected to the inlet of the liquid pump (13); The invention also includes a ring plate (4) and a sliding member (5), wherein the ring plate (4) is sleeved on the outside of the heat dissipation tube (21) and contacts the peripheral wall of the heat dissipation tube (21), and the sliding member (5) is used to drive the ring plate (4) to slide back and forth along the length direction of the heat dissipation tube (21); a spoiler (32) and a spoiler (6) are provided outside the sealed cabin (1) and between the two branch pipes (211), and the spoiler (6) is used to drive the spoiler (32) to move back and forth in a direction close to or away from the branch pipe (211); The spoiler (6) comprises a slide plate (61), a reset component (62), a convex block (63) and a docking protrusion (64); the convex block (63) and the ring plate (4) are arranged on the slide plate (61); the slide plate (61) is connected to the outer wall of the sealed cabin (1) by sliding along the length direction of the heat dissipation pipe (21); the docking protrusion (64) is arranged on the side wall of the spoiler (32); the docking protrusion (64) is located on the sliding path of the convex block (63) when sliding along the slide plate (61), so that when the convex block (63) contacts the docking protrusion (64), the spoiler (32) moves in a direction away from the convex block (63), and the reset component (62) is used to drive the spoiler (32) to move in a direction close to the convex block (63).

2. The underwater heat dissipation system for a battery pack according to claim 1, characterized in that: A water-absorbing flexible gasket (41) is provided on the inner wall of the ring plate (4) facing the heat dissipation pipe (21), and the water-absorbing flexible gasket (41) is fitted between the outer wall of the heat dissipation pipe (21) and the inner wall of the ring plate (4).

3. The underwater heat dissipation system for a battery pack according to claim 2, characterized in that: The outer wall of the ring plate (4) is hinged to the surface of the slide plate (61), and the ring plate (4) is movably sleeved on the outside of the heat dissipation pipe (21) with the hinge point as the center. When the spoiler (32) moves in a direction away from the protrusion (63), the ring plate (4) is located on the moving path of the spoiler (32).

4. The underwater heat dissipation system for a battery pack according to claim 3, characterized in that: A hinge shaft is provided at the hinged position between the ring plate (4) and the slide plate (61), and the ring plate (4) swings relative to the slide plate (61) via the hinge shaft. A torsion spring is provided outside the hinge shaft, and the torsion spring is connected between the slide plate (61) and the ring plate (4).

5. The underwater heat dissipation system for a battery pack according to claim 1, characterized in that: The invention also includes an anti-fouling cover (3) and a water pump (17). The anti-fouling cover (3) is arranged on the periphery of the two branch pipes (211), and a water hole (31) is opened on the side wall of the anti-fouling cover (3); each branch pipe (211) corresponds to a spoiler (32), and the spoiler (32) is slidably connected to the inner side of the anti-fouling cover (3). The two spoilers (32) and the side wall of the anti-fouling cover (3) jointly enclose a water passage cavity (33). The water pump (17) is arranged on the periphery of the sealed cabin (1), and the water inlet end of the water pump (17) is connected to the water body, and the water outlet end of the water pump (17) is connected to the water passage cavity (33) through the end of the water passage cavity (33).

6. The underwater heat dissipation system for a battery pack according to claim 1, characterized in that: A temperature sensor (7) is provided on a side wall of the ring plate (4) facing the heat dissipation pipe (21), a detection end of the temperature sensor (7) always being in contact with the wall of the heat dissipation pipe (21), the temperature sensor (7) being electrically connected to a controller (8), and the controller (8) being electrically connected to a liquid extraction pump (13) for controlling the start and stop and extraction speed of the liquid extraction pump (13) according to temperature data detected by the temperature sensor (7).

7. The underwater heat dissipation system for a battery pack according to claim 6, characterized in that: The sliding member (5) is controlled by a controller (8). The controller (8) is used to determine the temperature change speed of all the heat dissipation pipe (21) sections based on the temperature data at each preset heat dissipation pipe (21) section of the heat dissipation pipe (21) detected by the temperature sensor (7); and is also used to compare the temperature change speed at each heat dissipation pipe (21) section with the corresponding preset temperature change speed and calculate the difference. If there is a target heat dissipation pipe (21) section and the corresponding difference is higher than the preset difference, the controller (8) controls the sliding member (5) to drive the ring plate (4) to slide back and forth at the target heat dissipation pipe (21) section.

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