Underwater heat dissipation system for battery pack

Abstract

The invention relates to an underwater heat dissipation system for a battery pack, and relates to the technical field of battery heat dissipation. The device comprises a sealed cabin, and a battery pack is placed in the sealed cabin; one end of the cooling pipe is communicated with an inlet of the infusion pump, and the other end of the cooling pipe is communicated with a cooling medium source used for supplying a cooling medium; the part, far away from the infusion pump and the cooling medium source, of the cooling pipe is divided into a heat dissipation pipe and a heat absorption pipe, the heat dissipation pipe penetrates through the sealed cabin, is located outside the sealed cabin and is used for being in contact with a water body on the periphery of the sealed cabin, and the heat absorption pipe is in contact with the battery pack so as to be used for carrying out heat exchange with the battery pack; the heat dissipation device is used for achieving heat dissipation of the battery pack 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] The battery pack is a power supply structure formed by connecting multiple cells in series and parallel to meet the required capacity and voltage. The working environment temperature of the battery cell is very high, generally between 0~50℃. The mainstream battery cell on the market is made of lithium iron phosphate, which is easy to generate heat during operation, causing the temperature to rise, which can easily shorten the life of the battery cell due to excessive temperature or cause a fire due to overheating. After the battery cells are grouped, they are encapsulated in a closed cavity. When the battery cells are working, the closed cavity is not conducive to the heat dissipation of the battery cells. Heat accumulates inside the cavity. Excessive temperature will cause the battery to fail to work or shorten its life 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] The present application provides an underwater heat dissipation system for a battery pack, which adopts the following technical solution: A battery pack underwater heat dissipation system comprises a sealed cabin, in which a battery pack is placed; further comprising a liquid pump and a cooling pipe, wherein 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 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 with 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.

[0006] By adopting the above-mentioned technical scheme, 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 included 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.

[0007] 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.

[0008] 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 to affect 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, the present application specially arranges a sliding member and a ring plate, and the sliding member 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, thereby 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.

[0009] Preferably, the heat dissipation pipe includes two branch pipes which are interconnected and symmetrically arranged on the periphery of the sealed cabin, and the two branch pipes are respectively connected to a liquid pump and a cooling medium source away from the interconnected portion; a spoiler and a spoiler are arranged outside the sealed cabin and between the two branch pipes, and the spoiler is used to drive the spoiler to move back and forth in a direction close to or away from the branch pipe.

[0010] By adopting the above technical solution, the spoiler is set to accelerate the flow speed 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.

[0011] 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.

[0012] By adopting the above technical solution, in the process of driving the ring plate to slide through the sliding member, the sliding 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.

[0013] 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.

[0014] 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.

[0015] 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 in a direction away from the protrusion, the ring plate is located on the moving path of the spoiler.

[0016] By adopting the above technical solution, during the movement of the spoiler, since the ring plate is located on the moving 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, and the water-absorbing flexible gasket will be squeezed by the ring plate and the heat pipe during the swinging of the ring plate and deform and discharge the absorbed water, thereby further optimizing the contact between the water body and the peripheral wall of the heat pipe and the heat exchange effect.

[0017] Preferably, a hinge shaft is provided at the hinge position between the ring plate and the slide plate, the ring plate swings relative to the slide plate via 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.

[0018] 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 conveniently realized.

[0019] Preferably, it also includes an anti-pollution cover and a water pump, wherein 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 water holes; 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 jointly enclose a water passage cavity, and the water pump is arranged on the periphery of the sealed cabin, and 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.

[0020] By adopting the above technical solution, water is pumped into the water passage cavity by a water pump, so that the water impacts the water passage cavity, and then part of the water is impacted and flows out of the water passage 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, so as to achieve 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 body and reduce the amount of impurities retained on the peripheral wall of the branch pipe.

[0021] 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.

[0022] By adopting the above technical solution, in the process of the ring plate sliding 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 extraction speed of the coolant in the heat dissipation pipe by the liquid pump 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 liquid pump can be controlled to reduce the extraction speed of the cooling medium, thereby extending the heat exchange time between the cooling medium and the water body in the heat dissipation pipe.

[0023] Preferably, the sliding member is controlled by a controller, and the controller is used to determine the temperature change rate of all heat dissipation pipe sections based on the temperature data at each preset heat dissipation pipe section detected by the temperature sensor; and is also used to compare the temperature change rate at each heat dissipation pipe section with the corresponding preset temperature change rate and calculate the difference. If there is a target heat dissipation 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 dissipation pipe section.

[0024] By adopting the above technical solution, the temperature data detected by the temperature sensor is analyzed. Specifically, the heat exchange effect between the heat 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.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. 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 cooled, a liquid pump is used to extract a cooling medium through a cooling pipe to contact the battery pack to achieve heat exchange with the battery pack. In this process, a heat dissipation pipe included 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; 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 to affect 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, the present application specially arranges a sliding member and a ring plate, and the sliding member 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an underwater heat dissipation system for a battery pack disclosed in Example 1 of the present application.

[0027] Figure 2 It is a schematic diagram of the internal structure of the sealed cabin embodied in Example 1 of the present application.

[0028] Figure 3 It 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.

[0029] 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, and a schematic diagram used to reflect the water flow route of the cooling pipe.

[0030] Figure 5 It is a structural schematic diagram of an underwater heat dissipation system for a battery pack disclosed in Example 2 of the present application.

[0031] 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.

[0032] Figure 7 yes Figure 6 A magnified schematic diagram of center A.

[0033] Figure 8 It is a structural block diagram of the logical relationship between the controller, the temperature sensor, and the liquid pump in Example 2 of the present application.

[0034] Explanation of the reference numerals: 1. Sealed cabin; 11. Rack; 12. Battery pack; 13. Liquid pump; 14. Cooling medium source; 15. Air pipe; 16. Sealing pad; 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

[0035] The following is combined with Figure 1-8 This application is described in further detail.

[0036] Example 1 Embodiment 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 heat dissipation 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 used to electrically connect 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 specifically be a liquid storage tank containing the 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 pass 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.

[0037] 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 contacts 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 runs through the sealed cabin 1 and is located at 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 branch pipes 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.

[0038] 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 inert gas (such as nitrogen) is pumped into the sealed cabin 1 by the air pump and fills the sealed cabin 1, so that the sealed cabin 1 has an inert gas of standard atmospheric pressure. The end of the sealed cabin 1 and the position where the heat absorption pipe 22 passes through are both provided with a sealing gasket 16, which can be made of rubber. The inert gas has a fire extinguishing effect, which can provide an inert gas environment for the battery pack 12 with a high hazard level to prevent fire and safety accidents.

[0039] 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 to close the sealed cabin 1; 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, and finally the sealed cabin 1 is sealed; 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.

[0040] The cooling liquid in the cooling medium source 14 is pumped into the heat absorbing tube 22 through the heat dissipation tube 21 by the liquid pump 13, and the battery pack 12 is heat exchanged with the cooling liquid in the heat absorbing tube 22. In this process, the heat dissipation tube 21 contacts with the water body to realize heat exchange, so that the water body further cools the wall of the heat dissipation tube 21 and the cooling liquid in the heat dissipation tube 21.

[0041] Example 2 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-fouling cover 3, which is arranged on the outer wall of the sealed cabin 1 and covers the outer periphery of the heat dissipation pipe 21; the side wall and the top wall of the anti-fouling cover 3 are both provided with water-permeable holes 31, and the inner wall of the anti-fouling cover 3 is provided with a spoiler 32, the spoiler 32 is arranged one-to-one with the branch pipe 211, and the two spoilers 32 are located between the two branch pipes 211. The spoiler 32 is slidably connected to the inner wall of the anti-fouling cover 3, and the two spoilers 32 and the anti-fouling cover 3 jointly enclose a water-passing cavity 33, and the spoiler 32 slides toward or away from the corresponding branch pipe 211 during the sliding process. 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 end of the water through the cavity 33, so that part of the water body outside the sealed cabin 1 is pumped into the water through the cavity 33 by the water pump 17, 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.

[0042] It also includes a ring plate 4, a sliding member 5 and a spoiler 6; the ring plate 4 is arranged in one-to-one correspondence with the branch pipe 211, and is sleeved on the corresponding branch pipe 211. A water-absorbing flexible gasket 41 is arranged between the ring plate 4 and the branch pipe 211. The water-absorbing flexible gasket 41 can be made of sponge material. The water-absorbing flexible gasket 41 is fixedly connected to the inner wall of the ring plate 4 and fits with the peripheral wall of the branch pipe 211. The spoiler 6 includes a slide plate 61. The two ring plates 4 are respectively rotated on the surface of the slide plate 61 through a hinge shaft, and a torsion spring is sleeved on the outside of the hinge shaft, and the torsion spring is connected between the ring plate 4 and the slide plate 61.

[0043] The slide plate 61 is specifically made of a magnetic material, and the sliding member 5 is used to drive the slide plate 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 plate 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 cocentrically with the sealed cabin 1, and the side wall of the ring 52 is provided with a tooth groove meshing with the gear 53 along its circumference.

[0044] The spoiler 6 also includes a reset component 62, a protrusion 63 and a docking protrusion 64. The reset component 62 is specifically a spring. The reset component 62 is connected between the two spoilers 32. The protrusion 63 is arranged on the surface of the slide plate 61 and inserted in the water passage cavity 33. The docking protrusion 64 is arranged on the side wall of the spoiler 32 along the length direction of the spoiler 32. When the reset component 62 is not deformed, the docking protrusion 64 is located on the sliding path of the protrusion 63 when the slide plate 61 slides. When the protrusion 63 abuts against the docking protrusion 64, the two spoilers 32 will be pushed and move in a direction away from each other, that is, move in a direction close to the corresponding branch pipe 211. When the protrusion 63 rotates to a position where it is disengaged from 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 and reset in the direction close to the spoiler 32 under the action of the torsion spring.

[0045] The inner wall of the ring plate 4 near the hinge axis is provided with a temperature sensor 7, and the temperature sensor 7 is always attached to the outer wall of the branch pipe 211 corresponding to the ring plate 4. The temperature sensor 7 is electrically connected to the controller 8, and the liquid pump 13 and the sliding member 5 are all controlled by the controller 8. The controller 8 is used to control the start and stop and the extraction speed of the liquid pump 13 according to the temperature data detected by the temperature sensor 7. Specifically, the controller 8 divides the heat dissipation pipe 21 into a plurality of heat dissipation pipe 21 sections in advance, and presets a temperature threshold of each heat dissipation pipe 21 section. The controller 8 is used to determine the position of the ring plate 4 on the heat dissipation pipe 21 according to the sliding control of the sliding member 5 on the ring plate 4, and receives the temperature data at each heat dissipation pipe 21 section, compares the temperature data of each heat dissipation pipe 21 section with the preset temperature threshold, and when the temperature data is higher than the preset temperature threshold, controls the liquid pump 13 to suspend extraction or reduce the extraction speed (i.e., reduce the valve opening at the inlet position of the liquid pump 13) to extend the residence time of the cooling pipe 2 in the heat dissipation pipe 21.

[0046] In addition, the controller 8 is also used to obtain the temperature data of each heat dissipation tube 21 section, and calculate the temperature change speed of each heat dissipation tube 21 section, the temperature change speed = | the temperature of the starting position of the coolant flowing into the heat dissipation tube 21 section - the temperature data of the end point of the coolant flowing out of the heat dissipation tube 21 section | / the flow time; then based on the preset corresponding relationship table, the temperature change speed of each heat dissipation tube 21 section is compared with the corresponding preset temperature change speed and the difference is calculated. If there is a target heat dissipation tube 21 section, the temperature change speed is less than the corresponding preset temperature change speed, and the difference is higher than the preset difference, then the controller 8 controls the sliding member 5 to drive the ring plate 4 to slide back and forth at the target heat dissipation tube 21 section. The corresponding relationship table stores the position of each heat dissipation tube 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 dissipation tube 21 section, and the preset temperature change speed of the corresponding heat dissipation tube 21 section.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack underwater heat dissipation system, characterized in that: The invention comprises a sealed cabin (1), wherein a battery pack (12) is placed in the sealed cabin (1); and further comprises a liquid pump (13) and a cooling pipe (2), wherein one end of the cooling pipe (2) is connected to the inlet of the liquid pump (13), and the other end is connected to a cooling medium source (14) for supplying cooling medium; the portion of the cooling pipe (2) away from the liquid pump (13) and the cooling medium source (14) is divided into a heat dissipation pipe (21) and a heat absorption pipe (22), wherein the heat dissipation pipe (21) passes through the sealed cabin (1) and is located outside the sealed cabin (1) and is used to contact with the water body outside the sealed cabin (1), and the heat absorption pipe (22) is in contact with the battery pack (12) so as to perform heat exchange with the battery pack (12).

2. The underwater heat dissipation system for a battery pack according to claim 1, characterized in that: It also comprises 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 the ring plate (4) is in contact with 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).

3. The underwater heat dissipation system for a battery pack according to claim 2, characterized in that: The heat dissipation pipe (21) comprises two branch pipes (211) which are interconnected and symmetrically arranged at the periphery of the sealed cabin (1); the two branch pipes (211) are respectively connected to a liquid pump (13) and a cooling medium source (14) away from the interconnected position; a spoiler (32) and a spoiler member (6) are arranged outside the sealed cabin (1) and between the two branch pipes (211); the spoiler member (6) is used to drive the spoiler (32) to move back and forth in a direction close to or away from the branch pipes (211).

4. The underwater heat dissipation system for a battery pack according to claim 3, characterized in that: The spoiler (6) comprises a slide plate (61), a reset component (62), a protrusion (63) and a docking protrusion (64); the protrusion (63) and the ring plate (4) are arranged on the slide plate (61); the slide plate (61) is slidably connected to the outer wall of the sealed cabin (1) 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 protrusion (63) when sliding with the slide plate (61), so that when the protrusion (63) contacts the docking protrusion (64), the spoiler (32) moves in a direction away from the protrusion (63), and the reset component (62) is used to drive the spoiler (32) to move in a direction close to the protrusion (63).

5. The underwater heat dissipation system for a battery pack according to claim 4, 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).

6. The underwater heat dissipation system for a battery pack according to claim 5, 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).

7. The underwater heat dissipation system for a battery pack according to claim 6, characterized in that: A hinge shaft is provided at the hinge 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).

8. The underwater heat dissipation system for a battery pack according to claim 2, characterized in that: The invention also comprises 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 permeable 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). 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).

9. The underwater heat dissipation system for a battery pack according to claim 2, characterized in that: A temperature sensor (7) is provided on a side wall of the ring plate (4) facing the heat dissipation tube (21); a detection end of the temperature sensor (7) is always in contact with the tube wall of the heat dissipation tube (21); the temperature sensor (7) is electrically connected to a controller (8); and the controller (8) is 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).

10. The underwater heat dissipation system for a battery pack according to claim 9, 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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