A heat dissipation device for a lithium battery module

Abstract

The present invention discloses a heat dissipation device for a lithium battery module, which includes a bottom plate and a protective cover fixedly arranged on the top of the bottom plate. A battery body is installed on the top of the bottom plate in the inner cavity of the protective cover. Air inlets and air outlets are respectively formed on both sides of the protective cover. A filter screen is arranged at the air outlet, and a filtering mechanism is arranged at the air inlet; the filtering mechanism includes a filter belt arranged at the air inlet. Filter holes are arranged on the filter belt, and the top end of the filter belt is fixed to the top wall inside the air inlet; when the free end of the filter belt moves upward, the limit block can be driven to move upward synchronously, and the limit block moves relative to the surface of the filter belt during the upward movement, so that the filter belt is always in a bent state at its lowest point, thereby squeezing the filter holes on the filter belt, causing it to deform, and making the dust adhered to the filter holes be broken and extruded, which is beneficial to cleaning the filter belt.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery heat dissipation, and particularly to a heat dissipation device for a lithium battery module. Background Art

[0002] With the rapid development of battery technology, more and more batteries are being used in life. Lithium batteries are increasingly applied due to their light weight and large energy storage. However, after long-term operation of lithium batteries, a large amount of heat will be generated. If the heat is not dissipated in time, it is easy to cause the temperature inside the lithium battery to rise, affecting the performance of the lithium battery.

[0003] Chinese invention patent CN113555631A discloses a wind-cooled heat-dissipating storage battery, including a heat-insulating outer shell, and an upper cover is fixedly installed on the heat-insulating outer shell. In the present invention, by providing side heat absorption ports at the positions between each group of storage batteries, the generated heat enters the heat dissipation cavity through the through holes on the side heat absorption ports, and then a rotary motor is used to drive a heat dissipation fan to rotate to generate wind, so as to discharge the air in the heat dissipation cavity to the outside. Therefore, the air pressure inside the heat-insulating outer shell drops, causing the outside air to squeeze towards the inside of the heat-insulating outer shell. The openings for entering the inner cavity of the heat-insulating outer shell are only the top of the heat dissipation cavity and the air inlets on both sides, and the heat dissipation cavity is the air outlet. Therefore, air can only enter the heat-insulating outer shell through the air inlets to complete the cold and heat replacement. At the same time, a dust-proof filter screen is provided outside the air inlets to prevent dust from entering the heat-insulating outer shell and affecting the normal operation of the storage battery, improving the practicability of the device.

[0004] However, the filtering component on this device only filters the dust in the air through a filter screen. In actual use, the humid environment and the dust in the air often cause the dust to adhere to the filter holes of the filter screen. Over time, the dust gradually dries and hardens at the filter holes, making it difficult to clean and affecting the air intake efficiency.

[0005] Therefore, it is necessary to provide a heat dissipation device for a lithium battery module to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a heat dissipation device for a lithium battery module to solve the problem that the filtering component on the existing device only filters the dust in the air through a filter screen. In actual use, the humid environment and the dust in the air often cause the dust to adhere to the filter holes of the filter screen. Over time, the dust gradually dries and hardens at the filter holes, making it difficult to clean and affecting the air intake efficiency as mentioned in the above background art.

[0007] Based on the above ideas, the present invention provides the following technical solutions: It includes a bottom plate and a protective cover fixedly arranged on the top of the bottom plate. Inside the protective cover and on the top of the bottom plate, a battery body is installed. On both sides of the protective cover, an air inlet and an air outlet are respectively provided. A filter screen is arranged at the air outlet, and a filtering mechanism is arranged at the air inlet;

[0008] The filtering mechanism includes a filter belt arranged at the air inlet. The filter belt is provided with filter holes. The top end of the filter belt is fixed to the top wall inside the air inlet. The bottom end of the filter belt bends at the inner bottom end of the air inlet to form a bent portion. An air dust removal component is arranged inside the bent portion. When the free end of the filter belt at the air dust removal component is pulled upward, the air dust removal component moves upward synchronously and moves relative to the surface of the filter belt.

[0009] As a further scheme of the present invention: The included angle formed at the bent portion is an acute angle.

[0010] As a further scheme of the present invention: The air dust removal component is a limiting block in the shape of a triangular prism. One right-angled side and the hypotenuse of the limiting block are respectively in contact with the side surface of the filter belt at the bent portion. A through air guiding groove is arranged on the side surface of the limiting block in contact with the filter belt.

[0011] As a further scheme of the present invention: A sealing component is arranged inside the filter belt. When the free end of the filter belt is used to pull the filter belt upward, the sealing component moves upward synchronously inside the filter belt and seals the gap between the bottom end of the filter belt and the air inlet.

[0012] As a further scheme of the present invention: The sealing component includes a sealing belt. The sealing belt is arranged inside the filter belt. A connecting strip is fixedly connected to the inside of the filter belt. The connecting strips are symmetrically arranged on the front and back sides of the filter belt. A guiding groove is arranged on the opposite side surfaces of the connecting strips. A connecting shaft is arranged between the two connecting strips. Both ends of the connecting shaft are placed inside the guiding groove. A sleeve is sleeved on the outside of the connecting shaft. The sleeve is in contact with the inner side surface of the filter belt. The sealing belt is fixedly connected to the outside of the sleeve.

[0013] As a further scheme of the present invention: An accommodating chamber is arranged inside the protective cover. The accommodating chamber is arranged directly below the air inlet. A wind guiding cylinder is rotatably arranged inside the accommodating chamber. One end of the sealing belt away from the sleeve penetrates through the connection between the air inlet and the accommodating chamber and extends downward into the accommodating chamber. One end of the sealing belt extending into the accommodating chamber is fixed on the outside of the wind guiding cylinder and then wound around the wind guiding cylinder.

[0014] As a further solution of the present invention: strip-shaped grooves are formed on the front and rear side walls of the protective cover located at the air inlet, and sliders are connected to both the front and rear ends of the limiting block in a communicating manner, and the sliders are slidably connected to the inside of the strip-shaped grooves.

[0015] As a further solution of the present invention: a dust suction component is arranged inside the accommodation chamber. The dust suction component includes end caps rotatably arranged at both ends of the air guide tube. First and second guide tubes are respectively connected to both ends of the air guide tube in a communicating manner. One end of the first guide tube far from the end cap is communicated with the slider on one end of the limiting block. A connecting frame is arranged at the inner bottom end of the air inlet. The connecting frame penetrates through the connection part of the air inlet and the accommodation chamber. An exhaust groove is formed on the side surface of the connecting frame far from the sealing strip and is communicated with the second guide tube connected to the end cap. A fan is arranged inside the air guide tube near one end of the first guide tube.

[0016] As a further solution of the present invention: a micro air pump is arranged inside the air guide tube, and the first guide tube and the second guide tube are respectively connected to the input end and the output end of the micro air pump.

[0017] As a further solution of the present invention: a hollow chamber is arranged on the protective cover, a counterweight block is slidably connected inside the hollow chamber, a spring is arranged at the bottom end of the counterweight block and is arranged inside the hollow chamber. A cross shaft is arranged at the free end of the filter belt. Two pull ropes are symmetrically and fixedly connected to the top of the cross shaft. The top ends of the pull ropes extend upward into the hollow chamber and are placed on the top of the counterweight block, and the top ends of the pull ropes are fixedly connected to the top of the counterweight block.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: one right-angled side and the hypotenuse of the limiting block are respectively in contact with the side surface of the filter belt at the bending part. The filter belt forms an acute-angled bending part at the inner bottom end of the air inlet due to the extrusion of the limiting block on the filter belt. When the free end of the filter belt moves upward, the limiting block can be driven to move upward synchronously, and the limiting block moves relative to the surface of the filter belt during the upward movement, so that the filter belt is always in a bent state at its lowest point, thereby squeezing the filter holes on the filter belt, causing it to deform, and making the dust adhered to the filter holes be broken and extruded, which is beneficial to cleaning the filter belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is the structural schematic diagram of the filtering mechanism of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the filter belt, sealing belt and air guide cylinder of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the drawstring and cross shaft of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the connection between the first air duct and the second air duct and the air guide cylinder of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the connection between the limit block and the filter belt of the present invention;

[0026] Figure 7 It is the present invention Figure 2 Enlarged view of the structure of part A;

[0027] Figure 8 It is the present invention Figure 4 Enlarged view of the structure of part B;

[0028] Figure 9 It is a schematic structural diagram of the air guide cylinder inside the protective cover of the present invention;

[0029] Figure 10 It is a schematic structural diagram of the connection frame of the present invention;

[0030] Figure 11 It is a schematic structural diagram of the connecting shaft and the sleeve of the present invention.

[0031] In the figure: 1, air outlet; 2, filter screen; 3, battery body; 4, storage bag; 5, protective cover; 6, counterweight block; 7, drawstring; 8, spring; 9, filter belt; 10, air inlet; 11, connecting strip; 12, accommodation chamber; 13, air guide cylinder; 14, fan; 15, sealing belt; 16, first air duct; 17, end cover; 18, second air duct; 19, bending part; 20, limit block; 21, cross shaft; 22, sleeve; 23, strip groove; 24, connecting shaft; 25, shaft sleeve; 26, slider; 27, retaining strip; 28, exhaust slot; 29, air guiding slot; 30, sleeve; 31, connecting frame; 32, heat dissipation fan. Detailed implementation manners

[0032] As Figure 1 shown, a heat dissipation device for a lithium battery module includes a bottom plate and a protective cover 5 fixedly arranged on the top of the bottom plate. Inside the protective cover 5, a battery body 3 is installed on the top of the bottom plate. An air inlet 10 and an air outlet 1 are respectively formed on both sides of the protective cover 5. A filter screen 2 is arranged at the air outlet 1, and a filtering mechanism is arranged at the air inlet 10. At the same time, a heat dissipation fan 32 is arranged inside the protective cover 5, and the heat dissipation fan 32 is arranged at the air inlet 10.

[0033] During actual use, the cooling fan 32 sucks the gas outside the protective cover 5, filters it through the filtering mechanism and then enters the inside of the protective cover 5. After that, it passes through the battery body 3 and is discharged from the air outlet 1, thereby taking out the heat inside the protective cover 5 to dissipate the heat of the battery body 3.

[0034] As Figure 2-8 shown in FIGS. 11, the filtering mechanism includes a filter belt 9 disposed at the air inlet 10. The filter belt 9 is provided with filter holes for filtering dust and impurities in the air. The top end of the filter belt 9 is fixed to the top wall inside the air inlet 10, and the bottom end of the filter belt 9 is bent at the inner bottom end of the air inlet 10 to form a bent portion 19. An acute angle is formed at the bent portion 19, and a dust removal component is arranged inside the bent portion 19. During actual use, when the free end of the filter belt 9 at the position of the dust removal component is pulled upward, the dust removal component can be driven to move upward synchronously, and the dust removal component moves relative to its surface on the filter belt 9. Through the extrusion and limitation of the lowest end of the filter belt 9 by the arranged dust removal component, the lowest end of the filter belt 9 is always an acute angle when the free end of the filter belt 9 moves upward, so as to squeeze the filter holes on the filter belt 9 to deform it. In actual use, due to the humid environment and dust in the air, the dust often adheres to the filter holes on the filter belt 9. As time goes by, the dust gradually dries and hardens at the filter holes, making it difficult to clean and affecting the air intake efficiency. However, this structure squeezes the filter belt 9 through the dust removal component, so that the lowest end is always an acute angle during the movement process, so as to promote the deformation of the filter holes on the filter belt 9, thereby removing the dust adhered to the filter holes, which is beneficial to the smooth passage of external air through the filter belt 9 into the inside of the protective cover 5 to dissipate the heat of the battery body 3.

[0035] Furthermore, the dust removal component is a triangular prism-shaped limiting block 20. One right-angle side and the hypotenuse of the limiting block 20 are respectively in contact with the side surface of the filter belt 9 at the bent portion 19. The filter belt 9 forms a bent portion 19 with an acute angle at the inner bottom end of the air inlet 10 through the extrusion of the limiting block 20 on the filter belt 9. When the free end of the filter belt 9 moves upward, the limiting block 20 can be driven to move upward synchronously, and the limiting block 20 moves relative to the surface of the filter belt 9 during the upward movement, so that the filter belt 9 is always in a bent state at its lowest point, thereby squeezing the filter holes on the filter belt 9, promoting its deformation, and making the dust adhered to the filter holes be broken and extruded, which is beneficial to cleaning the filter belt 9.

[0036] Further, an air guiding groove 29 is formed through the side surface of the limiting block 20 in contact with the filter belt 9. When the limiting block 20 moves on the surface of the filter belt 9, impurities on the surface of the filter belt 9 can be sucked through the air guiding groove 29. For example, some impurities such as fluff and flying floc can enter the interior of the limiting block 20 through the air guiding groove 29, which is beneficial to further cleaning of the filter belt 9.

[0037] Furthermore, in order to prevent external air from entering the protective cover 5 through the gap at the bottom end of the filter belt 9 during the movement of the filter belt 9, a sealing assembly is provided on the inner side of the filter belt 9. During actual use, when the filter belt 9 is pulled upward by the free end of the filter belt 9, the sealing assembly moves upward synchronously on the inner side of the filter belt 9 and seals the gap between the bottom end of the filter belt 9 and the air inlet 10, thereby preventing external air from entering the protective cover 5 through this gap.

[0038] Specifically, the sealing assembly includes a sealing belt 15. The sealing belt 15 is arranged on the inner side of the filter belt 9. A connecting strip 11 is fixedly connected to the inner side of the filter belt 9. The connecting strip 11 is symmetrically arranged on the front and rear sides of the filter belt 9. At the same time, a guiding groove is formed on the opposite side surface of the connecting strip 11. A connecting shaft 24 is arranged between the two connecting strips 11. Sleeve 25 is rotatably arranged at both ends of the connecting shaft 24. The sleeve 25 is arranged inside the guiding groove. At the same time, a sleeve 30 is sleeved outside the connecting shaft 24. The sleeve 30 is in contact with the inner side surface of the filter belt 9. The sleeve 30 is made of rubber material. The sealing belt 15 is fixedly connected to the outside of the sleeve 30. In addition, a receiving chamber 12 is arranged inside the protective cover 5. The receiving chamber 12 is arranged directly below the air inlet 10. A wind guiding cylinder 13 is rotatably arranged inside the receiving chamber 12. One end of the sealing belt 15 away from the sleeve 30 penetrates through the protective cover 5 at the connection between the air inlet 10 and the receiving chamber 12 and extends downward into the receiving chamber 12. One end of the sealing belt 15 extending into the receiving chamber 12 is fixed on the outside of the wind guiding cylinder 13 and then wound around the wind guiding cylinder 13.

[0039] In actual use, when the free end of the filter belt 9 is pulled upward, it can drive the connecting strip 11 inside it to bend upward synchronously. At this time, the connecting shaft 24 can be driven to move upward through the connecting strip 11. Since the shaft sleeves 25 at both ends of the connecting shaft 24 are arranged inside the guiding grooves on the connecting strip 11, during the process of the connecting strip 11 bending upward along with the filter belt 9, the connecting shaft 24 will slide along the guiding groove to the bottom end where the connecting strip 11 bends. When the connecting strip 11 continuously moves upward along with the filter belt 9, the sealing belt 15 can be pulled out from the accommodating chamber 12. The pulled-out sealing belt 15 can seal the gap between the filter belt 9 and the air inlet 10. Here, by arranging the sealing belt 15 in contact with the filter belt 9, it can prevent air from flowing out through the gap between the sealing belt 15 and the filter belt 9, thereby further enhancing the sealing effect.

[0040] Through this sealing component, during the process of the filter belt 9 bending and moving upward, the gap between it and the bottom end of the air inlet 10 can be well sealed, thereby preventing external dust from entering the protective cover 5 and affecting the battery body 3.

[0041] Strip-shaped grooves 23 are formed on the front and rear side walls of the protective cover 5 located at the air inlet 10. The front and rear ends of the limiting block 20 are both connected with sliders 26 in a communicating manner. The sliders 26 are slidably connected inside the strip-shaped grooves 23. Through this mechanism, the movement of the limiting block 20 can be limited, improving its stability during movement.

[0042] As Figure 1 、 7 As shown in FIGS. 9 and 10, a dust suction component is further arranged inside the accommodating chamber 12. As a first embodiment of the dust suction component, end caps 17 are arranged at both ends of the air guide cylinder 13, and the air guide cylinder 13 is rotatably connected with the end caps 17. The end caps 17 are fixed inside the accommodating chamber 12. A first diversion pipe 16 and a second diversion pipe 18 are respectively communicated at both ends of the air guide cylinder 13. One end of the first diversion pipe 16 far from the end cap 17 is communicated with the slider 26 on one end of the limiting block 20. In addition, a connecting frame 31 is arranged at the inner bottom end of the air inlet 10. The connecting frame 31 penetrates through the connection between the air inlet 10 and the accommodating chamber 12, and the top of the connecting frame 31 is set as an inclined surface. An exhaust slot 28 is formed on the side surface of the connecting frame 31 far from the sealing belt 15. The exhaust slot 28 is arranged at the top end of the bottom surface of the air inlet 10, and one end of the second diversion pipe 18 communicated with the end cap 17 is connected with the connecting frame 31. In order to facilitate the cleaning of the dust falling from the filter belt 9, the inner bottom surface of the air inlet 10 is set as an inclined surface, which inclines towards the outside of the protective cover 5. In addition, a fan 14 is arranged at one end of the air guide cylinder 13 close to the first diversion pipe 16. A sleeve 22 is connected to the outside of the fan 14. The sleeve 22 is rotatably connected with the air guide pipe through a one-way bearing. Here, by arranging the one-way bearing, it is avoided that the filter belt 9 drives the fan 14 to reverse when resetting.

[0043] In actual use, when the filter belt 9 moves upward to synchronously drive the sealing belt 15 to move, the sealing belt 15 is pulled out of the accommodating chamber 12. Since it is wound around the air guide cylinder 13, when the sealing belt 15 is pulled, the air guide cylinder 13 can be driven to rotate, thereby driving the fan 14 inside the air guide cylinder 13 to rotate, so as to form an air flow and suction force. At this time, the air inside the limiting block 20 can be extracted through the first diversion pipe 16. And the limiting block 20 moves on the surface of the filter belt 9. Therefore, during the movement of the limiting block 20, impurities such as fluffs and hairs adhering to the sealing belt 15 can be sucked, and then enter the inside of the air guide cylinder 13 through the first diversion pipe 16. After that, it is discharged to the second diversion pipe 18 through the air guide cylinder 13. The second diversion pipe 18 can transport it to the connection frame 31. And the connection frame 31 is provided with an exhaust slot 28. Furthermore, the impurities can be discharged along the air flow from the exhaust slot 28, so as to be discharged into the external air. And during the upward bending movement of the filter belt 9, the dust adhered to the filter holes on it is extruded and falls onto the inclined bottom surface of the air inlet 10. The air flow discharged through the exhaust slot 28 can blow it out into the external air together.

[0044] As a second embodiment of the dust collection component, a micro air pump is arranged inside the air guide cylinder 13. And the first diversion pipe 16 and the second diversion pipe 18 are respectively connected to the input end and the output end of the micro air pump, so as to extract the air inside the limiting block 20, thereby sucking the dust on the surface of the filter belt 9 into the limiting block 20.

[0045] In order to avoid interference between the first diversion pipe 16 and the protective cover 5 during movement, a hollow space for the first diversion pipe 16 to move is arranged inside the protection.

[0046] As Figure 1 shown, a hollow chamber is arranged on the protective cover 5. A counterweight block 6 is slidably connected inside it. And a spring 8 is arranged at the bottom end of the counterweight block 6. The spring 8 is arranged inside the hollow chamber. A horizontal shaft 21 is arranged at the free end of the filter belt 9. Two pull ropes 7 are symmetrically and fixedly connected to the top of the horizontal shaft 21. The top ends of the pull ropes 7 extend upward into the hollow chamber and are placed on the top of the counterweight block 6. The top ends of the pull ropes 7 are fixedly connected to the top of the counterweight block 6. A pulley is arranged at the turning point of the pull ropes 7. The pulley is connected to the protective cover 5.

[0047] In actual use, when driving on a bumpy road surface, it can cause the counterweight block 6 to slide inside the hollow chamber, thereby driving the pull ropes 7 to move downward, and then pulling the free end of the filter belt 9 upward through the horizontal shaft 21, thereby promoting the entire filter belt 9 to bend and move upward.

[0048] As a second embodiment of the present solution, a micro electric push rod can be provided inside the hollow chamber. The micro electric push rod is arranged at the bottom end of the counterweight block 6, and the output end of the micro electric push rod is connected to the counterweight block 6, so as to drive the pulling rope 7 to move, thereby driving the connecting strip 11 to bend.

[0049] A storage bag 4 is further arranged at the inner top end of the protective cover 5. The storage bag 4 is filled with a fire extinguishing agent. When the battery body 3 catches fire naturally, the storage bag can be melted, thereby releasing the fire extinguishing agent inside it, which can avoid the spread of fire and has high safety.

[0050] A stop bar 27 is further arranged at the air inlet 10. The stop bar 27 is in contact with the connecting strip 11. By arranging the stop bar 27, the connecting strip 11 and the filter belt 9 can be limited, so that the front and rear sides of the connecting strip 11 and the filter belt 9 are in contact with the front and rear side walls of the air inlet 10, avoiding bending and disengaging from the inner wall of the air inlet 10 during use, which is beneficial to further improving its sealing performance.

Claims

1. A heat dissipation device for a lithium battery module, comprising a bottom plate and a protective cover fixedly arranged on the top of the bottom plate. A battery body is installed on the top of the bottom plate in the inner cavity of the protective cover. Air inlets and air outlets are respectively arranged on both sides of the protective cover, and a filter screen is arranged at the air outlet. It is characterized in that: A filtering mechanism is provided at the air inlet; The filtering mechanism includes a filter belt provided at the air inlet. The filter belt is provided with filter holes. The top end of the filter belt is fixed to the top wall inside the air inlet. The bottom end of the filter belt is bent at the inner bottom end of the air inlet to form a bent portion. A dust removal component is provided inside the bent portion. When the free end of the filter belt at the dust removal component is pulled upward, the dust removal component moves upward synchronously and moves relative to the surface of the filter belt; The included angle formed at the bent portion is an acute angle; The dust removal component is a limiting block in the shape of a triangular prism. One right-angle side and the hypotenuse of the limiting block are respectively in contact with the side surface of the filter belt at the bent portion. An air guiding groove penetrating through is provided on the side surface of the limiting block in contact with the filter belt; A hollow chamber is provided on the protective cover. A counterweight block is slidably connected inside the hollow chamber. A spring is provided at the bottom end of the counterweight block. The spring is arranged inside the hollow chamber. A cross shaft is provided at the free end of the filter belt. Two pull ropes are symmetrically and fixedly connected to the top of the cross shaft. The top ends of the pull ropes extend upward into the hollow chamber and are placed on the top of the counterweight block. The top ends of the pull ropes are fixedly connected to the top of the counterweight block.

2. The heat dissipation device for a lithium battery module according to claim 1, characterized in that: A sealing component is provided inside the filter belt. When the filter belt is pulled upward through the free end of the filter belt, the sealing component moves upward synchronously inside the filter belt and seals the gap between the bottom end of the filter belt and the air inlet.

3. The heat dissipation device for a lithium battery module according to claim 2, characterized in that: The sealing component includes a sealing belt. The sealing belt is arranged inside the filter belt. Connecting strips are fixedly connected to the inside of the filter belt. The connecting strips are symmetrically arranged on the front and back sides of the filter belt. Guide grooves are provided on the opposite side surfaces of the connecting strips. A connecting shaft is arranged between the two connecting strips. Both ends of the connecting shaft are placed inside the guide grooves. A sleeve is sleeved on the outside of the connecting shaft. The sleeve is in contact with the inner side surface of the filter belt. The sealing belt is fixedly connected to the outside of the sleeve.

4. The heat dissipation device for a lithium battery module according to claim 3, wherein: An accommodating chamber is provided inside the protective cover. The accommodating chamber is arranged directly below the air inlet. An air guiding cylinder is rotatably arranged inside the accommodating chamber. One end of the sealing belt away from the sleeve penetrates through the connection between the air inlet and the accommodating chamber and extends downward into the accommodating chamber. The end of the sealing belt extending into the accommodating chamber is fixed to the outside of the air guiding cylinder and then wound around the air guiding cylinder.

5. The heat dissipation device for a lithium battery module according to claim 1, wherein: Strip-shaped grooves are provided on the front and back side walls of the protective cover at the air inlet. Sliders are communicated with both the front and back ends of the limiting block. The sliders are slidably connected inside the strip-shaped grooves.

6. The heat dissipation device of a lithium battery module according to claim 4, characterized in that: A dust suction component is provided inside the accommodating chamber. The dust suction component includes end covers rotatably arranged at both ends of the air guiding cylinder. A first diversion pipe and a second diversion pipe are respectively communicated with both ends of the air guiding cylinder. One end of the first diversion pipe away from the end cover is communicated with the slider at one end of the limiting block. A connection frame is provided at the inner bottom end of the air inlet. The connection frame penetrates through the connection between the air inlet and the accommodating chamber. An exhaust groove is provided on the side surface of the connection frame away from the sealing belt. One end of the second diversion pipe communicated with the end cover is connected to the connection frame. A fan is provided at one end of the air guiding cylinder close to the first diversion pipe.

7. The heat dissipation device of a lithium battery module according to claim 6, characterized in that: A micro air pump is arranged inside the air duct, and the first diversion pipe and the second diversion pipe are respectively connected to the input end and the output end of the micro air pump.

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