New energy battery pack with efficient heat dissipation

Abstract

The invention discloses an efficient heat dissipation new energy battery pack which comprises a tray, an upper cover and a fixed shell located in the tray and the upper cover, the fixed shell is used for fixing a battery module composed of a plurality of battery cells, and the efficient heat dissipation new energy battery pack further comprises an air cooling assembly and a liquid cooling assembly which are used for conducting heat dissipation on the battery module. The air cooling assembly comprises a first air guide strip located on the tray and a second air guide strip located on the upper cover, the liquid cooling assembly comprises a liquid cooling base located at the bottom of the fixed shell and a heat dissipation hole groove formed in the fixed shell, and a piston plate is arranged in the liquid cooling base; the piston plate, the liquid cooling base and the bottom of the fixed shell define a cavity communicating with the heat dissipation hole grooves, and cooling liquid is injected into the cavity. By means of the air cooling assembly and the liquid cooling assembly, rapid heat dissipation of the multiple battery modules can be achieved, heat dissipation is uniform, the internal temperature of the battery pack can be controlled within a constant range, and the service life, performance and reliability of batteries are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a new energy battery pack with efficient heat dissipation. Background Art

[0002] With the rapid development of new energy vehicle technology, the performance of power batteries, as the core components of new energy vehicles, directly affects the performance of the entire vehicle. Temperature control has a great impact on the battery, so it is particularly important to keep the battery pack within the appropriate temperature range. Excessive temperature can lead to chemical decomposition, electrolyte volatilization and even thermal runaway (causing fire or explosion), while accelerating battery aging, reducing capacity and service life.

[0003] The current heat dissipation methods are mostly air cooling and liquid cooling. Air cooling is a heat dissipation method that uses air as a cooling medium to remove the heat from the battery surface. The heat is dissipated by the airflow generated by the rotation of auxiliary devices such as fans. When the airflow flows from the battery pack to the other side, the airflow will take away the heat. At this time, the temperature of the airflow will gradually increase, which will cause the heat to dissipate quickly on the air intake side and the heat dissipation effect on the air outlet side is poor, resulting in the defect of uneven heat dissipation.

[0004] Liquid cooling is achieved by setting up a liquid cooling plate under the battery module. The coolant can take away the heat of the battery as it circulates inside the liquid cooling plate. However, this method still has the above-mentioned defects. The coolant will continuously absorb and cause its own temperature to rise as it flows, and the heat dissipation effect will be greatly reduced in the tail section.

[0005] In summary, the current heat dissipation method still has defects and cannot dissipate heat from the battery pack well, and needs to be improved. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0007] Therefore, the object of the present invention is to provide a new energy battery pack with efficient heat dissipation, including a tray and an upper cover, and a fixed shell located inside the tray and the upper cover, wherein the fixed shell is used to fix a battery module composed of multiple battery cells, and also includes an air cooling component and a liquid cooling component for dissipating heat from the battery module.

[0008] The air cooling assembly includes a first air guide strip located on the tray and a second air guide strip located on the upper cover. The top surface of the first air guide strip is connected to a first connecting tube, the top end of the first connecting tube is connected to a second connecting tube, and the bottom surface of the second air guide strip is connected to a third connecting tube for docking with the second connecting tube. Through holes are evenly opened on the walls of the third connecting tube and the second connecting tube.

[0009] The liquid cooling assembly includes a liquid cooling seat located at the bottom of the fixed shell, and a heat dissipation hole groove opened inside the fixed shell. A piston plate is arranged inside the liquid cooling seat. The piston plate, the liquid cooling seat and the bottom of the fixed shell enclose a cavity connected to the heat dissipation hole groove, and the cavity is injected with coolant.

[0010] The bottom surface of the piston plate extends vertically upward to form a groove, a magnet block is embedded in the groove wall, an electromagnet is provided on the liquid cooling seat just below the magnet block, and the opposite ends of the electromagnet and the magnet block have the same magnetic poles.

[0011] As the preferred technical solution:

[0012] As described above, a new energy battery pack with efficient heat dissipation is provided on the tray, and a plurality of long first grooves are provided on the upper cover. The first air guide strips are embedded in the first grooves, and the second air guide strips are embedded in the second grooves. The first air guide strips and the second air guide strips correspond to each other one by one.

[0013] Through the above technical solution, since the first air guide strip is embedded in the first groove and the second air guide strip is embedded in the second groove, the first air guide strip and the second air guide strip do not occupy the internal space of the battery pack. In this way, the capacity of the battery pack will not be reduced while ensuring the heat dissipation effect.

[0014] As described above, a new energy battery pack with efficient heat dissipation is provided with a plurality of through slots on one side of the upper cover, the first air guide bar and the second air guide bar are both hollow, both ends of the first air guide bar are closed, one end of the second air guide bar is closed, and the other end of the second air guide bar is open and extends into the inner through slot.

[0015] Through the above technical solution, the structures of the first air guide strip and the second air guide strip are designed so that after the airflow inside the first air guide strip is introduced into the second air guide strip, the airflow will be ejected from the through groove through the open end of the second air guide strip, thus achieving continuous heat dissipation operation.

[0016] As described above, a new energy battery pack with efficient heat dissipation, the first air guide bar and the second air guide bar are welded to one end with a diverter bar, and the welding connection between the first air guide bar, the second air guide bar and the diverter bar is provided with guide holes that are interconnected, the side surface of the diverter bar is connected to the air outlet end of the fan through a conduit, and the other side surface of the diverter bar is provided with multiple air outlet holes.

[0017] Through the above technical solution, since the heat inside the battery pack will be continuously absorbed, air can be added into the battery pack through the air outlet, so that air circulation can be achieved and the temperature inside the battery pack can be maintained at a constant level.

[0018] As described above, in a new energy battery pack with high heat dissipation efficiency, the inner diameter of the first connecting tube is larger than that of the second connecting tube, the inner diameter of the second connecting tube is equal to the diameter of the third connecting tube, and a sealing ring is fixedly mounted on the outer circular wall of the third connecting tube.

[0019] Through the above technical solution, the size design of the third connecting tube and the second connecting tube allows the third connecting tube to be inserted into the second connecting tube, and after insertion, the sealing ring can be tightly pressed against the end face of the second connecting tube, thereby ensuring that the third connecting tube and the second connecting tube can be sealed and docked.

[0020] As described above, in a new energy battery pack with efficient heat dissipation, the first connecting pipe is located between two fixed shells, and there are multiple first connecting pipes and third connecting pipes distributed at equal distances, and the first connecting pipes and the third connecting pipes correspond to each other one by one.

[0021] Through the above technical solution, the first connecting tube and the third connecting tube correspond to each other up and down, so that when the tray and the upper cover are assembled, the third connecting tube can be accurately inserted into the second connecting tube, and the structure is reasonable.

[0022] As described above, in a new energy battery pack with efficient heat dissipation, the liquid cooling seat and the piston plate are both hollow structures, the top surface of the liquid cooling seat is open, the bottom surface of the liquid cooling seat is fixed on the tray, and the side wall of the piston plate is fixedly bonded with a rubber ring, and the piston plate is sealed to the inner wall of the liquid cooling seat through the rubber ring.

[0023] Through the above technical solution, the liquid cooling seat and the fixed shell are sealed by welding or other means to ensure that the coolant in the cavity will not leak. The fixed shell is made of metal and is in contact with the battery module through a thermally conductive silicone sheet, so that it can fully absorb the heat emitted by the battery module. When the coolant flows inside it, it can take away the heat, thereby indirectly dissipating the heat of the battery module.

[0024] As described above, a new energy battery pack with efficient heat dissipation has a plurality of parallel heat-conducting fins integrally formed on the inner wall of the piston plate, and an air inlet pipe and an air outlet pipe are respectively passed through the bottom wall of the piston plate on both sides of the groove, and the bottom ends of the air inlet pipe and the air outlet pipe pass through the liquid cooling seat and are connected to the top surface of the first air guide strip.

[0025] A partition is integrally formed on the inner wall of the first air guide strip, and the cross section of the partition is "凵"-shaped. A connecting cavity is formed between the partition and the first air guide strip, and the air outlet pipe is connected to the first connecting pipe through the connecting cavity.

[0026] Through the above technical solution, the piston plate is made of metal. While it continuously squeezes the coolant, the heat of the coolant will be transferred to the heat-conducting fins inside the piston plate. When air flows through the inside of the piston plate, it can take away the heat on the heat-conducting fins, thereby indirectly cooling the coolant and ensuring the heat dissipation effect of the coolant.

[0027] In the new energy battery pack with high heat dissipation efficiency as described above, a long wire tube is fixed on the inner wall of the first air guide strip, and the surface of the wire tube does not contact the bottom surface of the partition.

[0028] Through the above technical solution, since the electromagnet needs to be connected to the circuit through a cable, a wire tube is provided. By passing the cable into the wire tube and then connecting the electromagnet to the cable, the cable can be sorted through the wire tube to avoid being scattered and disordered, and the cable can be protected at the same time.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] (1) The Venturi effect of the air cooling system works in conjunction with the distributed drainage. The variable diameter design (decreasing inner diameter) of the first and second connecting tubes causes the air velocity in the second connecting tube to increase sharply, forming a low-pressure area. Combined with the through holes in the wall of the third and second connecting tubes, the hot air inside the battery pack is evenly sucked into the pipe, overcoming the uneven heat dissipation problem of "cold air inlet and hot air outlet" in traditional air cooling. The diverter strips supply air to the battery pack through the air outlet holes, forming a closed-loop air circulation, maintaining a dynamic balance between the internal air pressure and temperature.

[0031] (2) The pulsating cooling of the liquid cooling system and the air cooling heat recovery work together. The electromagnet and the magnet block have the same poles that repel each other, driving the piston plate to move back and forth, forcing the coolant to pulsate between the cavity and the heat dissipation hole slot, avoiding the efficiency attenuation caused by the temperature rise at the tail end of traditional liquid cooling; the heat-conducting fins inside the piston plate absorb the heat of the coolant, and directly exchange heat with the air-cooled airflow introduced by the air inlet pipe (the airflow takes away the heat through the inside of the piston plate), realizing the active cooling of the liquid cooling system; the airflow after heat exchange is introduced into the connecting cavity through the air outlet pipe, and finally merges into the main air-cooled airflow for discharge, forming an energy recovery link.

[0032] (3) System-level optimization of spatial layout and thermal management. The first / second air guide strips are embedded in the tray / top cover grooves, and the liquid cooling seat is integrated into the bottom of the fixed shell, occupying zero cell space to ensure the energy density of the battery pack; the multi-stage diversion design of the air-cooling airflow between the air guide strips, connecting pipes, and piston plates achieves point-to-point heat dissipation coverage for each battery module; the linkage between the electromagnetic drive piston and the air-cooling airflow enables the liquid cooling system to be activated only when the temperature rise exceeds the standard, reducing system energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0034] Figure 1 A top perspective view of the tray and upper cover of the present invention;

[0035] Figure 2 A bottom perspective view of the tray and upper cover of the present invention;

[0036] Figure 3 An exploded perspective view of the tray, fixed housing, and battery module of the present invention;

[0037] Figure 4 A perspective view of the first connecting pipe, the second connecting pipe and the third connecting pipe of the present invention;

[0038] Figure 5 A three-dimensional diagram of the fixed housing, liquid cooling seat and piston plate of the present invention;

[0039] Figure 6 is a sectional perspective view of a first air guide strip of the present invention;

[0040] Figure 7 It is a front cross-sectional view of the liquid cooling seat and the piston plate of the present invention;

[0041] Figure 8 It is a side sectional view of the liquid cooling seat and piston plate of the present invention.

[0042] In the figure: 1. tray; 2. upper cover; 3. fixed shell; 4. battery module; 5. first groove; 6. second groove; 7. first air guide strip; 8. second air guide strip; 9. first connecting pipe; 10. second connecting pipe; 11. third connecting pipe; 12. through hole; 13. sealing ring; 14. through groove; 15. diverter strip; 16. conduit; 17. liquid cooling seat; 18. piston plate; 19. cavity; 20. heat dissipation hole groove; 21. groove; 22. electromagnet; 23. magnet block; 24. heat conducting fin; 25. air inlet pipe; 26. air outlet pipe; 27. partition; 28. wire pipe; 29. ​​connecting cavity. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0045] like Figure 1-Figure 5 As shown, an embodiment of the present invention discloses a new energy battery pack with efficient heat dissipation, including a tray 1 and an upper cover 2, and a fixed shell 3 located within the tray 1 and the upper cover 2, the fixed shell 3 is used to fix a battery module 4 composed of multiple battery cells.

[0046] It also includes an air cooling component and a liquid cooling component for dissipating heat from the battery module 4.

[0047] The air cooling assembly includes a first air guide strip 7 located on the tray 1, and a second air guide strip 8 located on the upper cover 2. The top surface of the first air guide strip 7 is connected to a first connecting pipe 9, the top end of the first connecting pipe 9 is connected to a second connecting pipe 10, and the bottom surface of the second air guide strip 8 is connected to a third connecting pipe 11 for docking with the second connecting pipe 10. Through holes 12 are evenly opened on the walls of the third connecting pipe 11 and the second connecting pipe 10.

[0048] One end of the first air guide strip 7 and the second air guide strip 8 are welded to a diverter strip 15, and guide holes that are interconnected are opened at the welding connection between the first air guide strip 7, the second air guide strip 8 and the diverter strip 15. The side of the diverter strip 15 is connected to the air outlet end of the fan through a conduit 16, and a plurality of air outlet holes are opened on the other side of the diverter strip 15.

[0049] The inner diameter of the first connecting pipe 9 is greater than that of the second connecting pipe 10 . The inner diameter of the second connecting pipe 10 is equal to the diameter of the third connecting pipe 11 . A sealing ring 13 is fixedly mounted on the outer circular wall of the third connecting pipe 11 .

[0050] The liquid cooling assembly includes a liquid cooling seat 17 located at the bottom of the fixed shell 3, and a heat dissipation hole groove 20 opened inside the fixed shell 3. A piston plate 18 is arranged inside the liquid cooling seat 17. The piston plate 18, the liquid cooling seat 17 and the bottom of the fixed shell 3 enclose a cavity 19 connected to the heat dissipation hole groove 20, and the cavity 19 is injected with cooling liquid.

[0051] The bottom surface of the piston plate 18 extends vertically upward to form a groove 21, and a magnet block 23 is embedded in the groove wall of the groove 21. An electromagnet 22 is provided on the liquid cooling seat 17 directly below the magnet block 23, and the opposite ends of the electromagnet 22 and the magnet block 23 have the same magnetic poles.

[0052] Specifically, after the tray 1 and the upper cover 2 are assembled, the bottom end of the third communicating tube 11 can be inserted into the second communicating tube 10 , and the second communicating tube 10 and the third communicating tube 11 are connected to each other.

[0053] When the battery pack is working, the battery module 4 will continuously generate heat, and the heat will be conducted to the fixed shell 3 and the inside of the battery pack. After the fan is started, the outside air can be sucked in and sent into the diverter strip 15 through the duct 16. Then the airflow passes through the diverter strip 15 and the guide holes on the first air guide strip 7 into the first air guide strip 7. The airflow in the first air guide strip 7 will be diverted to each first connecting tube 9. The airflow will flow to the second air guide strip 8 through the second connecting tube 10 and the third connecting tube 11, thereby defining the path for the flow of air. Due to the size design of the first connecting tube 9 and the second connecting tube 10, the airflow in the first connecting tube 9 is When entering the second connecting pipe 10, the air flow velocity increases due to the sudden decrease in the pipe diameter. At this time, the pressure in the second connecting pipe 10 and the third connecting pipe 11 is lower than the external pressure, thereby forming an inhalation effect, that is, the hot air in the battery pack will be sucked into the second connecting pipe 10 and the third connecting pipe 11 through the through hole 12, and the hot air will flow into the second air guide strip 8 along with the air flow. In this way, by continuously sucking away the hot air, the interior of the battery pack can be quickly cooled. In this process, the outside air will be replenished into the battery pack through the air outlet on the side of the diverter strip 15, so as to realize air circulation and continuous heat dissipation.

[0054] Those skilled in the art will appreciate that when the above-mentioned air cooling cannot quickly cool down the battery pack, the electromagnet 22 starts to be energized and generates magnetic force after being energized. At this time, the electromagnet 22 and the magnet block 23 repel each other, so that the piston plate 18 can be pushed upward by the magnet block 23. When the piston plate 18 moves upward, the coolant in the cavity 19 can be squeezed into the heat dissipation hole groove 20. When the electromagnet 22 is disconnected, the repulsive force disappears, and the piston plate 18 is reset under the action of gravity. At this time, the coolant in the heat dissipation hole groove 20 flows back into the cavity 19. In this way, the electromagnet 22 is intermittently energized or the current direction of the electromagnet 22 is changed to achieve vertical reciprocating motion of the piston plate 18. In this way, the coolant can continuously flow in the heat dissipation hole groove 20 to take away the heat from the fixed shell 3, thereby indirectly dissipating heat to the battery module 4. By cooperating with the air cooling component and the liquid cooling component, rapid cooling can be achieved, and the internal temperature of the battery pack can be controlled within a constant range.

[0055] In a specific embodiment of the present invention, a plurality of long first grooves 5 are provided on the tray 1, a plurality of long second grooves 6 are provided on the upper cover 2, the first air guide strip 7 is embedded in the first groove 5, the second air guide strip 8 is embedded in the second groove 6, and the first air guide strip 7 and the second air guide strip 8 correspond one to one in the upper and lower parts.

[0056] A plurality of through slots 14 are provided on one side of the upper cover 2. The first air guide strip 7 and the second air guide strip 8 are both hollow. Both ends of the first air guide strip 7 are closed. One end of the second air guide strip 8 is closed. The other end of the second air guide strip 8 is open and extends into the inner through slot 14.

[0057] The first communicating pipe 9 is located between the two fixed shells 3 . There are multiple first communicating pipes 9 and multiple third communicating pipes 11 distributed at equal intervals. The first communicating pipes 9 and the third communicating pipes 11 correspond to each other one by one.

[0058] Specifically, such as Figure 2 and Figure 3 As shown, the first air guide strip 7 is embedded in the first groove 5, and the second air guide strip 8 is embedded in the second groove 6. In this way, the first air guide strip 7 and the second air guide strip 8 do not occupy the internal space of the battery pack, ensuring that the battery pack capacity is not affected. At the same time, it also makes the inner surfaces of the tray 1 and the upper cover 2 smooth, which is convenient for assembly of other components such as the battery module 4.

[0059] The setting of the through groove 14 allows the heat inside the battery pack to be absorbed into the second connecting tube 10 and the third connecting tube 11, and then enter the second air guide strip 8 with the air flow, and finally be discharged from the through groove 14 through the open end of the second air guide strip 8, so that the heat in the battery pack can be continuously discharged to achieve heat dissipation.

[0060] There are multiple first connecting pipes 9, which can be evenly distributed inside the battery pack and can generate suction at multiple locations inside the battery pack, thereby evenly absorbing heat and achieving good heat dissipation effect.

[0061] In a specific embodiment of the present invention, the liquid cooling seat 17 and the piston plate 18 are both hollow structures, the top surface of the liquid cooling seat 17 is open, the bottom surface of the liquid cooling seat 17 is fixed on the tray 1, and the side wall of the piston plate 18 is fixedly bonded with a rubber ring, and the piston plate 18 is sealed to the inner wall of the liquid cooling seat 17 through the rubber ring.

[0062] A plurality of parallel heat-conducting fins 24 are integrally formed on the inner wall of the piston plate 18. An air inlet pipe 25 and an air outlet pipe 26 are respectively passed through the bottom wall of the piston plate 18 on both sides of the groove 21. The bottom ends of the air inlet pipe 25 and the air outlet pipe 26 pass through the liquid cooling seat 17 and are connected to the top surface of the first air guide strip 7.

[0063] A partition 27 is integrally formed on the inner wall of the first air guide strip 7 , and the cross section of the partition 27 is in the shape of a "凵"; a connecting cavity 29 is formed between the partition 27 and the first air guide strip 7 , and the air outlet pipe 26 is connected to the first connecting pipe 9 through the connecting cavity 29 .

[0064] A long wire tube 28 is fixed on the inner wall of the first air guide strip 7 , and the surface of the wire tube 28 does not contact the bottom surface of the partition plate 27 .

[0065] Specifically, such as Figure 6 , and 7 and Figure 8 As shown, when the piston plate 18 moves vertically inside the liquid cooling seat 17, under the action of the rubber ring, it can ensure that all the coolant in the cavity 19 is squeezed into the multiple heat dissipation hole grooves 20. The piston plate 18 moves back and forth, and the coolant can continuously flow back and forth in the heat dissipation hole grooves 20, thereby continuously taking away the heat on the fixed shell 3.

[0066] As the coolant absorbs heat, its own temperature will gradually rise, which will reduce the heat conduction efficiency. The piston plate 18 is made of metal, and multiple heat-conducting fins 24 are distributed inside the piston plate 18. The temperature of the coolant can be conducted to the piston plate 18 and the heat-conducting fins 24.

[0067] When the air in the first air guide strip 7 is flowing, the airflow will be diverted to the air outlet pipe 26. At this time, the airflow is introduced into the piston plate 18. In this way, when the airflow flows inside the piston plate 18, it can pass through the multiple heat-conducting fins 24 and continuously take away the heat of the heat-conducting fins 24. In this way, the coolant is cooled, thereby improving the heat dissipation effect of the coolant on the fixed shell 3.

[0068] The air in the piston plate 18 will eventually be discharged through the air outlet pipe 26. Due to the setting of the partition 27, the air in the air outlet pipe 26 will not enter the first air guide strip 7 again, but enter the first connecting pipe 9 through the connecting cavity 29. Through this design, the air entering the piston plate 18 is all natural wind, ensuring the heat exchange effect with the piston plate 18 and the thermal fins 24.

[0069] The setting of the partition 27 does not completely isolate the interior of the first air guide strip 7. In this way, when the air in the first air guide strip 7 flows, it will be diverted to multiple air outlet pipes 26, so that heat exchange operations can be performed on the piston plates 18 in multiple liquid cooling seats 17 simultaneously, thereby evenly dissipating heat for multiple battery modules 4.

[0070] In this specification, terms such as "connect," "install," and "fix" should be understood broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection or an indirect connection through an intermediary. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0071] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A new energy battery pack with high heat dissipation efficiency, comprising a tray (1) and an upper cover (2), and a fixed housing (3) located within the tray (1) and the upper cover (2), wherein the fixed housing (3) is used to fix a battery module (4) composed of a plurality of battery cells, and is characterized in that: It also includes an air cooling component and a liquid cooling component for dissipating heat from the battery module (4). The air cooling assembly includes a first air guide strip (7) located on the tray (1) and a second air guide strip (8) located on the upper cover (2), the top surface of the first air guide strip (7) is connected to a first connecting pipe (9), the top end of the first connecting pipe (9) is connected to a second connecting pipe (10), the bottom surface of the second air guide strip (8) is connected to a third connecting pipe (11) for docking with the second connecting pipe (10), and through holes (12) are evenly opened on the walls of the third connecting pipe (11) and the second connecting pipe (10). The liquid cooling assembly comprises a liquid cooling seat (17) located at the bottom of the fixed shell (3), and a heat dissipation hole groove (20) opened inside the fixed shell (3), a piston plate (18) is arranged inside the liquid cooling seat (17), and the piston plate (18), the liquid cooling seat (17) and the bottom of the fixed shell (3) enclose a cavity (19) connected to the heat dissipation hole groove (20), and a cooling liquid is injected into the cavity (19). The bottom surface of the piston plate (18) extends vertically upward to form a groove (21), a magnet block (23) is embedded in the groove wall of the groove (21), and an electromagnet (22) is provided on the liquid cooling seat (17) directly below the magnet block (23), and the opposite ends of the electromagnet (22) and the magnet block (23) are magnetic poles of the same name.

2. The new energy battery pack with high heat dissipation efficiency according to claim 1, characterized in that: The tray (1) is provided with a plurality of first elongated grooves (5), and the upper cover (2) is provided with a plurality of second elongated grooves (6). The first air guide strips (7) are embedded in the first grooves (5), and the second air guide strips (8) are embedded in the second grooves (6). The first air guide strips (7) and the second air guide strips (8) correspond to each other in an upper and lower manner.

3. The new energy battery pack with high heat dissipation efficiency according to claim 1, characterized in that: A plurality of through slots (14) are provided on one side of the upper cover (2); the first air guide strip (7) and the second air guide strip (8) are both hollow; both ends of the first air guide strip (7) are closed; one end of the second air guide strip (8) is closed; the other end of the second air guide strip (8) is open and extends into the inner through slot (14).

4. The new energy battery pack with high heat dissipation efficiency according to claim 1, characterized in that: One end of the first air guide strip (7) and the second air guide strip (8) are welded to a diverter strip (15), and mutually communicating guide holes are provided at the welded connection between the first air guide strip (7), the second air guide strip (8) and the diverter strip (15). The side of the diverter strip (15) is connected to the air outlet end of the fan through a conduit (16), and the other side of the diverter strip (15) is provided with a plurality of air outlet holes.

5. The new energy battery pack with high heat dissipation efficiency according to claim 1, characterized in that: The inner diameter of the first connecting tube (9) is greater than the inner diameter of the second connecting tube (10), the inner diameter of the second connecting tube (10) is equal to the diameter of the third connecting tube (11), and a sealing ring (13) is fixedly mounted on the outer circular wall of the third connecting tube (11).

6. The new energy battery pack with high heat dissipation efficiency according to claim 5, characterized in that: The first connecting pipe (9) is located between the two fixed shells (3), and a plurality of the first connecting pipes (9) and the third connecting pipes (11) are evenly distributed, and the first connecting pipes (9) and the third connecting pipes (11) correspond to each other one by one.

7. The new energy battery pack with high heat dissipation efficiency according to claim 1, characterized in that: The liquid cooling seat (17) and the piston plate (18) are both hollow structures. The top surface of the liquid cooling seat (17) is open. The bottom surface of the liquid cooling seat (17) is fixed on the tray (1). A rubber ring is fixedly bonded to the side wall of the piston plate (18). The piston plate (18) is hermetically fitted with the inner wall of the liquid cooling seat (17) through the rubber ring.

8. The new energy battery pack with high heat dissipation efficiency according to claim 1, characterized in that: A plurality of parallel-distributed heat-conducting fins (24) are integrally formed on the inner wall of the piston plate (18). An air inlet pipe (25) and an air outlet pipe (26) respectively penetrate through the bottom wall bodies of the piston plate (18) on both sides of the groove (21). The bottom ends of the air inlet pipe (25) and the air outlet pipe (26) both penetrate through the liquid cooling seat (17) and are connected to the top surface of the first air guiding strip (7) in a communicating manner.

9. The new energy battery pack with high heat dissipation efficiency according to claim 8, characterized in that: A partition plate (27) is integrally formed on the inner wall of the first air guiding strip (7). The cross section of the partition plate (27) is in a "U" shape. A communicating cavity (29) is formed by enclosing between the partition plate (27) and the first air guiding strip (7). The air outlet pipe (26) is connected to the first communicating pipe (9) through the communicating cavity (29).

10. The new energy battery pack with high heat dissipation efficiency according to claim 1, characterized in that: A long strip-shaped wire pipe (28) is fixed on the inner wall of the first air guiding strip (7). The surface of the wire pipe (28) does not contact the bottom surface of the partition plate (27).

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