Air cooling device, battery pack, control method of battery pack and vehicle

Abstract

The invention discloses an air cooling device, a battery pack, a control method of the battery pack and a vehicle. The air cooling device comprises a mounting base, a first driving part, fan blades and a waterproof breathable film, and the first driving part is arranged on the mounting base; the fan blades are connected with the first driving piece, and the first driving piece is suitable for driving the fan blades to rotate; the waterproof breathable film is arranged at the end, away from the fan blades, of the installation base. Therefore, the air cooling device is suitable for being assembled on the battery pack to play a heat dissipation role on the battery pack, the air cooling device realizes air circulation through the waterproof breathable film, meanwhile, moisture is prevented from entering the battery pack, and the water sealing performance of the battery pack is ensured. When the temperature of the battery pack reaches a certain value, the air cooling device is started, and air enters the battery pack under the action of the fan, circulates in the battery pack and flows out of the battery pack after heat exchange, so that the heat dissipation efficiency of the battery pack can be effectively improved, and the cycle life of the battery pack is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to an air cooling device, a battery pack, a battery pack control method, and a vehicle. Background Art

[0002] In the prior art, the battery cell group in the battery pack dissipates heat through the upper or lower cold plate. As the charging rate increases, a single cooling method cannot meet the heat dissipation requirements of the battery pack, which can easily lead to excessive battery pack temperature and poor safety. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the present invention is to provide an air cooling device that can improve the heat dissipation efficiency of the battery pack and enhance the sealing performance of the battery pack.

[0004] A second object of the present invention is to provide a battery pack comprising the air cooling device described in the above embodiment.

[0005] A third object of the present invention is to provide a control method for a battery pack, wherein the control method is used to control the battery pack described in the above embodiment.

[0006] A fourth object of the present invention is to provide a vehicle comprising the air cooling device, battery pack or battery pack control method described in the above embodiments.

[0007] According to the air cooling device of the first aspect of the embodiment of the present invention, the air cooling device includes: a mounting seat, a first driving member, fan blades and a waterproof breathable membrane, the first driving member is arranged on the mounting seat; the fan blades are connected to the first driving member, and the first driving member is suitable for driving the fan blades to rotate; the waterproof breathable membrane is arranged at one end of the mounting seat away from the fan blades.

[0008] According to an embodiment of the present invention, the air cooling device is suitable for installation on a battery pack to dissipate heat from the pack. The air cooling device facilitates air circulation through a waterproof, breathable membrane while simultaneously preventing moisture from entering the battery pack, ensuring the pack's watertight seal. When the battery pack temperature reaches a certain level, the air cooling device activates, allowing air to enter the battery pack through a fan. Air circulates within the battery pack, completes heat exchange, and then exits the pack, effectively improving the battery pack's heat dissipation efficiency and extending its cycle life.

[0009] In some embodiments, the waterproof and breathable membrane is made of a polymer material.

[0010] In some embodiments, the mounting seat is formed with a first flow channel, the waterproof breathable membrane is provided at one end of the first flow channel, and the waterproof breathable membrane covers the first flow channel.

[0011] In some embodiments, it also includes: a mounting bracket, the mounting bracket is arranged at one end of the mounting seat away from the fan blade, the mounting bracket is connected to the mounting seat, and the waterproof breathable membrane is arranged between the mounting bracket and the mounting seat.

[0012] In some embodiments, one of the mounting seat and the mounting bracket is formed with a mating groove, and the other of the mounting seat and the mounting bracket is formed with a mating protrusion, the mating protrusion and the mating groove can be detachably mated, and the waterproof breathable membrane is arranged in the mating groove.

[0013] In some embodiments, the mounting bracket includes: a protective cover and an extension portion, one end of the extension portion is connected to the protective cover, the other end of the extension portion is detachably connected to the mounting seat, and the extension portion is formed with at least one of the mating groove and the mating protrusion.

[0014] In some embodiments, the extension portion is formed with at least one through hole, and the through hole is communicated with the first flow channel.

[0015] In some embodiments, there are a plurality of through holes, and the plurality of through holes are spaced apart along the circumference of the protective cover, and a central axis of the through hole is perpendicular to a central axis of the first flow channel.

[0016] In some embodiments, the air cooling device also includes: an elastic component, the elastic component is connected to the mounting base, the elastic component is arranged at an end of the mounting base away from the fan blade, the elastic component has a compressed first position and an extended second position, when the elastic component moves from the first position to the second position, the elastic component passes through the waterproof and breathable membrane.

[0017] In some embodiments, the elastic component includes: a spring pin and a second driving member, the second driving member is connected to the spring pin, and the second driving member drives the spring pin to move between the first position and the second position.

[0018] In some embodiments, the second driving member drives the spring pin to remain in the first position; and / or the second driving member drives the spring pin to remain in the second position.

[0019] In some embodiments, a sealing groove is formed on the mounting seat, and the sealing groove is arranged at one end of the mounting seat facing the fan blade; and further includes: a sealing member, and the sealing member is arranged in the sealing groove.

[0020] In some embodiments, at least a portion of the seal protrudes from a side surface of the mounting seat toward the fan blade.

[0021] A battery pack according to an embodiment of the second aspect of the present invention includes: a tray, at least one battery cell group and a battery management device, wherein the tray is formed with at least one accommodating cavity; the battery cell group is arranged in the accommodating cavity; the battery management device includes an air cooling device, which is arranged on the tray, and is suitable for convection between the air inside the battery pack and the air outside, and the air cooling device is the air cooling device according to the embodiment of the first aspect of the present invention.

[0022] In some embodiments, the tray includes: at least one side wall, the side wall is formed with a mounting hole, the mounting hole passes through the side wall, the mounting hole connects the inside and outside of the tray, and at least a portion of the air cooling device cooperates with the mounting hole.

[0023] In some embodiments, a second flow channel is formed on the side wall, and the second flow channel connects the accommodating cavity and the first flow channel of the air cooling device.

[0024] In some embodiments, there are multiple side walls, including a first side wall and a second side wall arranged opposite to each other, and the second flow channel is provided in the first side wall and the second side wall; there are multiple air cooling devices, and the multiple air cooling devices are respectively arranged at the mounting holes, one end of the multiple second flow channels is connected to the accommodating cavity, and the other end of the multiple second flow channels is respectively connected to the air cooling device.

[0025] In some embodiments, the plurality of air cooling devices include: a first air cooling device and a second air cooling device, wherein the first air cooling device and the second air cooling device are respectively connected to the second flow channel in the first side wall and the second side wall, and the air flow directions in the first air cooling device and the second air cooling device are opposite.

[0026] In some embodiments, the plurality of side walls include: at least one third side wall, the third side wall connecting the first side wall and the second side wall, and the mounting hole is provided on the third side wall.

[0027] In some embodiments, there are multiple mounting holes, and the multiple mounting holes are respectively arranged at both ends of the third side wall; at least one confluence hole is formed on the side adjacent to each other of the first side wall and the second side wall, and the confluence holes are respectively connected to the adjacent mounting holes.

[0028] In some embodiments, a plurality of the air cooling devices are disposed on the same side wall of the tray.

[0029] In some embodiments, the tray further includes: a first partition, the first partition is arranged in the accommodating cavity, the first partition is connected between the first side wall and the third side wall, the first partition defines a third flow channel with the first side wall and the third side wall; and / or, the first partition is connected between the second side wall and the third side wall, the first partition defines a third flow channel with the second side wall and the third side wall, and the third flow channel is connected to the confluence hole and the mounting hole adjacent to each other.

[0030] In some embodiments, the tray further includes: a plurality of second partitions, the plurality of second partitions being spaced apart between the first side wall and the second side wall, the plurality of partitions dividing the accommodating cavity into a plurality of sub-chambers; the battery pack further includes: a plurality of battery cell groups, the plurality of battery cell groups being respectively arranged in the plurality of sub-chambers.

[0031] In some embodiments, the battery cell group and the sidewall of the sub-chamber define at least one fourth flow channel, and the fourth flow channel is connected to at least one second flow channel in the first sidewall and the second sidewall.

[0032] In some embodiments, the battery pack also includes a temperature sensor, and the battery management device includes: a liquid cooling device, the liquid cooling device is arranged at the bottom of the tray, the battery cell group is in contact with the liquid cooling device, and the temperature sensor is electrically connected to the liquid cooling device and the air cooling device respectively.

[0033] According to a control method for a battery pack according to an embodiment of the third aspect of the present invention, the control method is used to control the battery pack according to the above-mentioned embodiment of the second aspect of the present invention, and the method steps include: a temperature sensor of the battery pack is arranged in the accommodating cavity of the battery pack; the temperature sensor obtains the temperature inside the battery pack; the battery management device of the battery pack obtains a temperature of the temperature sensor that is less than or equal to a first preset temperature, and the air cooling device and the liquid cooling device of the battery pack are turned off; the temperature of the temperature sensor obtained by the battery management device is greater than the first preset temperature and less than or equal to the second preset temperature, and the liquid cooling device is turned on; the temperature of the temperature sensor obtained by the battery management device is greater than the second preset temperature and less than or equal to the third preset temperature, and the liquid cooling device and the air cooling device are turned on.

[0034] In some embodiments, there are multiple temperature sensors, including a first temperature sensor and a second temperature sensor, one of the first temperature sensor and the second temperature sensor is arranged in the accommodating cavity, the other of the first temperature sensor and the second temperature sensor is arranged in the second flow channel of the battery pack, and the first temperature sensor and the second temperature sensor are electrically connected to the battery management system.

[0035] The method according to the second aspect of the present invention further includes: when the temperature difference between the first temperature sensor and the second temperature sensor is greater than a fourth preset temperature, the air cooling device is turned on.

[0036] The vehicle according to the fourth embodiment of the present invention includes the air cooling device according to the first embodiment of the present invention, or the battery pack according to the second embodiment of the present invention, or the control method according to the third embodiment of the present invention.

[0037] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which: Figure 1 is a schematic diagram of a battery pack according to an embodiment of the present invention; Figure 2 is a schematic top view of a battery pack according to an embodiment of the present invention; Figure 3 is a schematic cross-sectional view of a battery pack according to an embodiment of the present invention; Figure 4 yes Figure 3 Enlarged schematic diagram of the middle P region; Figure 5 is a schematic diagram of an air cooling device according to an embodiment of the present invention; Figure 6 2 is an exploded schematic diagram of an air cooling device according to an embodiment of the present invention.

[0039] Reference numerals: 100. Battery pack; 10. Air cooling device; 11. Mounting seat; 111. Mating groove; 112. Sealing groove; 113. Sealing member; 12. Fan blade; 13. First driving member; 14. Waterproof breathable membrane; 15. First flow channel; 16. Mounting bracket; 161. Protective cover; 162. Extension; 163. Mating protrusion; 164. Through hole; 17. Spring thimble; 18. First air cooling device; 19. Second air cooling device; 20. Tray; 21. First side wall; 22. Second side wall; 23. Third side wall; 24. Mounting hole; 25. Second flow channel; 26. First partition; 27. Second partition; 28. Third flow channel; 29. Fourth flow channel; 30. Battery cell group; A. The first direction. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-6 The air cooling device 10 according to an embodiment of the present invention is described. The air cooling device 10 includes a mounting base 11 , a first driving member 13 , fan blades 12 and a waterproof breathable membrane 14 .

[0041] Specifically, if Figures 1-6 As shown, the first driving member 13 is provided on the mounting seat 11; the fan blade 12 is connected to the first driving member 13, and the first driving member 13 is suitable for driving the fan blade 12 to rotate; the waterproof breathable membrane 14 is provided at one end of the mounting seat 11 away from the fan blade 12.

[0042] Combine Figures 1-6 The mounting base 11 is the basic component of the air cooling device 10, which is used to assemble other components and can be fixed at a position that requires cooling. The first driving member 13 is mounted on the mounting base 11. The first driving member 13 is suitable for generating power. The fan blades 12 are connected to the first driving member 13. The fan blades 12 rotate with the power provided by the driving member to generate airflow, thereby achieving the purpose of heat dissipation. A waterproof and breathable membrane 14 is provided at one end of the mounting base 11 away from the fan blades 12. The function of the waterproof and breathable membrane 14 is to prevent water vapor from entering the interior of the device while allowing air to pass through. The air cooling device 10 is suitable for being assembled on the battery pack 100 to dissipate heat for the battery pack 100. The waterproof and breathable membrane 14 is suitable for being provided on the side of the mounting base 11 adjacent to the battery pack 100.

[0043] According to an embodiment of the present invention, the air cooling device 10 is suitable for installation on a battery pack 100 to dissipate heat from the battery pack 100. The air cooling device 10 facilitates air circulation through a waterproof, breathable membrane 14 while simultaneously preventing moisture from entering the battery pack 100, thereby ensuring the watertightness of the battery pack 100. When the temperature of the battery pack 100 reaches a certain value, the air cooling device 10 is activated, and air enters the battery pack 100 under the action of the fan blades 12. After circulating within the battery pack 100 and completing heat exchange, it flows out of the battery pack 100, effectively improving the heat dissipation efficiency of the battery pack 100 and extending its cycle life.

[0044] According to some embodiments of the present invention, the waterproof breathable membrane 14 is made of a polymer material.

[0045] There are tiny holes on the waterproof and breathable membrane 14, whose pore diameter is about 0.4 nanometers smaller than water molecules and about 0.36 nanometers larger than air molecules. While ensuring that air can circulate inside the package and the outside world, it prevents water from entering the battery pack 100, ensuring the water-tight performance of the battery pack 100.

[0046] As a result, the waterproof, breathable membrane 14, made of a polymer material, effectively prevents moisture penetration, protecting the device's interior from humid environments and preventing short circuits and other electrical failures. The waterproof, breathable membrane 14 allows air to pass through, ensuring smooth flow of air from the air-cooling device 10, thereby maintaining good ventilation and improving heat dissipation. Polymer materials generally have good weather resistance and chemical stability, maintaining their performance under varying temperature and humidity conditions, thereby extending the service life of the air-cooling device 10.

[0047] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, the mounting seat 11 is formed with a first flow channel 15 , and a waterproof breathable membrane 14 is provided at one end of the first flow channel 15 , and the waterproof breathable membrane 14 covers the first flow channel 15 .

[0048] A first flow channel 15 is formed inside the mounting base 11. The first flow channel 15 is used to guide the flow direction of the airflow so that the airflow passes through the device more orderly and efficiently. The first flow channel 15 extends along the first direction A. The first flow channel 15 passes through the mounting base 11 along the first direction A. The waterproof breathable membrane 14 is arranged at one end of the first flow channel 15 along the first direction A and covers one end of the flow channel. The first flow channel 15 is suitable for being opposite to the fan. The airflow generated when the fan rotates enters or flows out of the battery pack 100 through the first flow channel 15 and the waterproof breathable membrane 14. In some embodiments, there can be multiple first flow channels 15, and the multiple first flow channels 15 are arranged at intervals along the circumference of the mounting base 11. The fan is arranged on one side of the first flow channel 15 along the first direction A, and the waterproof breathable membrane 14 is arranged at the end of the first flow channel 15 along the first direction A away from the fan.

[0049] Thus, by forming the first flow channel 15 on the mounting base 11, air is suitable for entering the battery pack 100 through the first flow channel 15, allowing air to flow smoothly through the air cooling device 10. The first flow channel 15 is suitable for guiding the flow direction of air to achieve better air circulation. The waterproof breathable membrane 14 is provided to block moisture in the air, improving cooling efficiency while ensuring protection for the battery pack 100.

[0050] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, it also includes: a mounting bracket 16, which is arranged at one end of the mounting base 11 away from the fan blades 12, the mounting bracket 16 is connected to the mounting base 11, and the waterproof breathable membrane 14 is arranged between the mounting bracket 16 and the mounting base 11.

[0051] Mounting bracket 16 is disposed at one end of mounting base 11, away from fan blades 12, along first direction A. Waterproof breathable membrane 14 is sandwiched between mounting bracket 16 and mounting base 11. Together, mounting bracket 16 and mounting base 11 secure and limit the waterproof breathable membrane 14. Mounting bracket 16 defines a cavity, which is adapted to face first flow channel 15 of mounting base 11. First flow channel 15 communicates with the cavity, allowing airflow to enter or exit the battery pack 100 through the first flow channel 15 and the cavity, thereby achieving heat exchange between the airflow and the battery pack 100.

[0052] Therefore, the connection between the mounting bracket 16 and the mounting seat 11 helps to improve the overall structural stability of the air cooling device 10. The mounting seat 11 and the mounting bracket 16 jointly fix and limit the waterproof breathable membrane 14, ensuring that the waterproof breathable membrane 14 will not shift or fall off during use.

[0053] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, one of the mounting seat 11 and the mounting bracket 16 is formed with a mating groove 111, and the other of the mounting seat 11 and the mounting bracket 16 is formed with a mating protrusion 163. The mating protrusion 163 and the mating groove 111 can be detachably mated, and the waterproof breathable membrane 14 is arranged in the mating groove 111.

[0054] A mating groove 111 is formed on one end of the mounting base 11 adjacent to the mounting bracket 16 along the first direction A. The mating groove 111 is formed by recessing a portion of the end surface of the mounting base 11 adjacent to the mounting bracket 16 along the first direction A, away from the mounting bracket 16. The edge of the waterproof breathable membrane 14 is adapted to contact the bottom wall of the mating groove 111, and the waterproof breathable membrane 14 is laid on the bottom wall of the mating groove 111. A mating protrusion 163 is formed on one end of the mounting bracket 16 adjacent to the mounting base 11 along the first direction A. The mating protrusion 163 matches the structure of the mating groove and is inserted into the mating groove 111 to form a releasable mating connection. One side surface of the waterproof breathable membrane 14 along the thickness direction contacts the bottom wall of the mating groove 111, and the other side surface of the waterproof breathable membrane 14 contacts the end face of the mating protrusion 163 along the first direction A, that is, when the mounting seat 11 and the mounting bracket 16 are mated through the mating protrusion 163 and the mating groove 111, the waterproof breathable membrane 14 is pressed between the two to ensure its stable position.

[0055] Therefore, the arrangement of the mating protrusion 163 and the mating groove 111 facilitates the convenient assembly and disassembly of the mounting bracket 16 with the mounting base 11. The arrangement of the mating groove 111 and the mating protrusion 163 can ensure that the waterproof breathable membrane 14 is tightly fixed and not easily affected by airflow, preventing displacement caused by vibration or external force, and can also provide protection for the edge of the waterproof breathable membrane 14, avoiding exposure of the waterproof breathable membrane 14 to the outside and reducing the possibility of damage.

[0056] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, the mounting bracket 16 includes: a protective cover 161 and an extension portion 162, one end of the extension portion 162 is connected to the protective cover 161, and the other end of the extension portion 162 is detachably connected to the mounting base 11, and the extension portion 162 is formed with at least one of a mating groove 111 and a mating protrusion 163.

[0057] The extension portion 162 extends along the first direction A. One end of the extension portion 162 along the first direction A is connected to the protective cover 161, and the other end of the extension portion 162 along the first direction A is detachably connected to the mounting base 11. A cavity is formed in the extension portion 162. The protective cover 161 is a solid body adapted to enclose one end of the extension portion 162. The protective cover 161 is opposed to the waterproof breathable membrane 14 along the first direction A.

[0058] Therefore, the setting of the protective cover 161 and the extension portion 162 helps to improve the structural strength of the mounting bracket 16. The protective cover 161 is used to protect the waterproof and breathable membrane 14 from damage by objects such as sand and stones, so that the mounting bracket 16 has a better protection function. The setting of the matching groove 111 and the matching protrusion 163 ensures a firm connection between the mounting bracket 16 and the mounting seat 11, and also facilitates the later maintenance of the air cooling device 10. When the waterproof and breathable membrane 14 needs to be maintained or replaced, the mounting bracket 16 can be easily removed and reinstalled after the maintenance is completed.

[0059] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, the extension portion 162 is formed with at least one through hole 164 , and the through hole 164 is communicated with the first flow channel 15 .

[0060] Through-hole 164 extends radially through the sidewall of extension 162. Through-hole 164 is adapted to communicate with the cavity of mounting bracket 16 and, in turn, with first flow channel 15. Under the influence of the fan, airflow can pass through through-hole 164, the cavity, and waterproof breathable membrane 14, into first flow channel 15, and then into the interior of battery pack 100. Alternatively, airflow can sequentially pass through first flow channel 15, waterproof breathable membrane 14, the cavity, and through-hole 164 to exit battery pack 100.

[0061] Therefore, the provision of the through holes 164 ensures effective airflow, facilitates airflow into or out of the battery pack 100 , improves the flow efficiency of the system, and enhances the heat dissipation efficiency of the air cooling device 10 .

[0062] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, there are multiple through holes 164 , which are spaced apart along the circumference of the protective cover 161 , and the central axis of the through hole 164 is perpendicular to the central axis of the first flow channel 15 .

[0063] Multiple through-holes 164 are spaced apart along the circumference of protective cover 161 on extension 162. This arrangement allows airflow to enter and exit evenly from multiple directions. The central axis of through-hole 164 is perpendicular to the central axis of first flow channel 15, ensuring that airflow can pass directly through the sidewall of extension 162, thereby smoothly entering and exiting the cavity.

[0064] Therefore, the provision of multiple through holes 164 helps to improve the uniformity of airflow and heat dissipation efficiency, making the airflow path more efficient and improving the heat dissipation efficiency of the air cooling device 10.

[0065] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, the air cooling device 10 also includes: an elastic component, the elastic component is connected to the mounting seat 11, the elastic component is arranged at the end of the mounting seat 11 away from the fan blade 12, the elastic component has a compressed first position and an extended second position, when the elastic component moves from the first position to the second position, the elastic component passes through the waterproof and breathable membrane 14.

[0066] The elastic component is disposed at one end of the mounting base 11, away from the fan blades 12, along the first direction A. The elastic component is adapted to move between a first position and a second position along the first direction A. When the battery pack 100 is in normal operation, the elastic component is in the compressed first position. When thermal runaway occurs, the elastic component moves from the compressed first position to the extended second position. During this movement, the elastic component penetrates the waterproof and breathable membrane 14, thereby increasing the amount of air discharged.

[0067] Therefore, when the battery pack 100 is in normal operation, the elastic component is in a compressed state, and the waterproof breathable membrane 14 is intact, allowing only air to pass through while preventing moisture from entering. However, when the battery pack 100 experiences thermal runaway, the internal pressure rises sharply, and the elastic component moves from the first position to the second position, thereby piercing the waterproof breathable membrane 14, increasing the exhaust volume, and quickly releasing the superheated gas to prevent further danger. When the battery pack 100 experiences thermal runaway, the elastic component can respond in a timely manner, increasing the exhaust volume by piercing the waterproof breathable membrane 14, improving the safety and reliability of the air cooling device 10, and thus protecting the safety of the battery pack 100.

[0068] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, the elastic component includes: a spring ejector pin 17 and a second driving member, the second driving member is connected to the spring ejector pin 17, and the second driving member drives the spring ejector pin 17 to move between the first position and the second position.

[0069] The second driving member is connected to the spring thimble 17, and is used to drive the spring thimble 17 to move between the first position and the second position. When the battery pack 100 is in normal working condition, the second driving member keeps the spring thimble 17 in the compressed first position. At this time, the waterproof breathable membrane 14 is intact, allowing only air to pass through while preventing moisture from entering. When thermal runaway occurs in the battery pack 100, the second driving member drives the spring thimble 17 to move from the first position to the second position. In this process, the spring thimble 17 will penetrate the waterproof breathable membrane 14, thereby increasing the exhaust volume and quickly releasing the overheated gas inside the battery pack 100 to prevent further danger.

[0070] Therefore, the design of the spring thimble 17 enables it to be quickly extended under the drive of the second driving member, destroying the waterproof breathable membrane 14, thereby achieving emergency exhaust. The second driving member is suitable for providing power for the spring thimble 17, thereby improving the safety and reliability of the air cooling device 10.

[0071] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, the second driving member drives the spring ejector 17 to remain in the first position; and / or, the second driving member drives the spring ejector 17 to remain in the second position.

[0072] When the battery pack 100 is operating normally, the second driver drives the spring-loaded ejector pin 17 to remain in the first position, and the waterproof, breathable membrane 14 remains intact. If thermal runaway occurs in the battery pack 100, the second driver drives the spring-loaded ejector pin 17 from the first position to the second position, where it remains. At this point, the spring-loaded ejector pin 17 pierces the waterproof, breathable membrane 14, enabling emergency venting.

[0073] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, a sealing groove 112 is formed on the mounting seat 11 , and the sealing groove 112 is arranged at one end of the mounting seat 11 facing the fan blade 12 ; and further includes: a sealing member 113 , and the sealing member 113 is arranged in the sealing groove 112 .

[0074] The sealing groove 112 is formed by recessing at least a portion of the surface of the mounting base 11 adjacent to the blade 12 in the first direction A away from the blade 12 . The sealing member 113 is adapted to be embedded in the sealing groove 112 .

[0075] Therefore, the provision of the sealing groove 112 and the sealing member 113 facilitates ensuring the sealing performance of the battery pack 100 after the air cooling device 10 is installed on the battery pack 100 .

[0076] According to some embodiments of the present invention, Figure 4-Figure 6 As shown, at least a portion of the sealing member 113 protrudes from a side surface of the mounting seat 11 facing the fan blade 12 .

[0077] That is, a portion of the sealing member 113 extends beyond the surface of the mounting seat 11 , so that when the air cooling device 10 is mounted on the battery pack 100 , it can better contact the battery pack 100 and form a seal.

[0078] As a result, at least part of the seal 113 protrudes from the side surface of the mounting base 11 toward the fan blade 12, and the seal 113 can better fit the contact surface between the mounting base 11 and the battery pack 100, thereby enhancing the sealing effect and preventing external impurities such as dust and moisture from entering the interior of the battery pack 100.

[0079] The battery pack 100 according to the second embodiment of the present invention is as follows: Figure 1-Figure 3 As shown, the battery pack 100 includes: a tray 20, at least one battery cell group 30 and a battery management device, the tray 20 is formed with at least one accommodating cavity; the battery cell group 30 is arranged in the accommodating cavity; the battery management device includes an air cooling device 10, the air cooling device 10 is arranged on the tray 20, the air cooling device 10 is suitable for the air inside the battery pack 100 and the air outside to form convection, and the air cooling device 10 is the air cooling device 10 according to the above-mentioned first aspect embodiment of the present invention.

[0080] The tray 20 is the foundation of the battery pack 100, used to support and secure other components. The tray 20 has at least one cavity for accommodating the battery cell pack 30. The cell pack 30, housed within the cavity of the tray 20, serves as the core energy storage unit of the battery pack 100. The air cooling device 10 is designed to create convection between the air inside the battery pack 100 and the air outside, thereby dissipating heat and regulating the temperature within the battery pack 100.

[0081] According to the battery pack 100 of the embodiment of the present invention, by applying the air cooling device 10 in the above embodiment, when the air cooling device 10 is started, the first driving member 13 drives the fan blades 12 to rotate, generating airflow, and the airflow enters the interior of the battery pack 100 through the waterproof and breathable membrane 14 of the mounting seat 11 and the first flow channel 15, and contacts the battery cell group 30 to take away heat, thereby achieving heat dissipation of the battery pack 100. The elastic component can destroy the waterproof and breathable membrane 14 in an emergency, increase the exhaust volume, and improve safety. By integrating the air cooling device 100 into the design of the battery pack 100, not only the heat dissipation performance of the battery pack 100 is improved, but also its waterproof, breathable and emergency response capabilities are enhanced, thereby improving the overall performance and safety of the battery pack 100.

[0082] According to some embodiments of the present invention, Figure 2 As shown, the tray 20 includes: at least one side wall, with a mounting hole 24 formed on the side wall, the mounting hole 24 passes through the side wall, and the mounting hole 24 connects the inside and outside of the tray 20, and at least part of the air cooling device 10 cooperates with the mounting hole 24.

[0083] The sidewalls enclose the battery pack 100, protecting the internal components and providing structural support. Mounting holes 24 are provided on the sidewalls, connecting the interior and exterior of the tray 20. At least a portion of the air cooling device 10 engages with the mounting holes 24, allowing the air cooling device 10 to be secured to the tray 20 and ensuring airflow.

[0084] Thus, the air cooling device 10 is fixed to the side wall of the tray 20 through the mounting hole 24 , so that the air cooling device 10 can be stably installed on the battery pack 100 and ensure that air flow can enter and exit the interior of the battery pack 100 through the mounting hole 24 .

[0085] According to some embodiments of the present invention, Figure 2 As shown, a second flow channel 25 is formed on the side wall, and the second flow channel 25 connects the accommodating cavity and the first flow channel 15 of the air cooling device 10 .

[0086] A second flow channel 25 is formed inside the side wall, and the second flow channel 25 is used to connect the accommodating cavity and the first flow channel 15 of the air cooling device 10, ensuring that the air flow can enter the first flow channel 15 through the through hole 164, and then enter the battery pack 100 through the second flow channel 25, and then complete the heat exchange with the battery cell in the second flow channel 25.

[0087] Therefore, the provision of the second flow channel 25 facilitates the circulation of airflow inside the battery pack 100 , ensuring smooth circulation of airflow to facilitate heat exchange of the battery cells and improve the heat dissipation efficiency of the battery pack 100 .

[0088] According to some embodiments of the present invention, Figure 2 As shown, there are multiple side walls, including a first side wall 21 and a second side wall 22 arranged opposite to each other, and a second flow channel 25 is provided in the first side wall 21 and the second side wall 22; there are multiple air cooling devices 10, and the multiple air cooling devices 10 are respectively arranged at the mounting holes 24, one end of the multiple second flow channels 25 is connected to the accommodating cavity, and the other end of the multiple second flow channels 25 is respectively connected to the air cooling device 10.

[0089] The battery pack 100 has a length and a width. A first sidewall 21 and a second sidewall 22 extend along the length of the battery pack 100 and are positioned opposite each other along the width. Second flow channels 25 are defined within the first and second sidewalls 21, 22, extending along the length of the battery pack 100. When one air cooling device 10 is activated, the airflow generated by the fan's rotation passes through the first flow channel 15 of the mounting base 11 and then into the second flow channel 25 in the sidewall of the battery pack 100. The airflow then enters the accommodating cavity through the second flow channel 25, completing heat exchange with the battery pack 100. After contacting the battery cells and removing heat, the airflow exits the battery pack 100 through the second flow channel 25 and the other air cooling device 10.

[0090] Therefore, the arrangement of multiple air cooling devices 10 and second flow channels 25 facilitates the inflow and outflow of air. The arrangement of multiple second flow channels 25 facilitates the air flow to enter the interior of the battery pack 100 more evenly and fully contact the battery cells, thereby improving heat dissipation efficiency.

[0091] According to some embodiments of the present invention, Figure 2 As shown, the multiple air cooling devices 10 include: a first air cooling device 18 and a second air cooling device 19, the first air cooling device 18 and the second air cooling device 19 are respectively connected to the second flow channel 25 in the first side wall 21 and the second side wall 22, and the air flow directions in the first air cooling device 18 and the second air cooling device 19 are opposite.

[0092] The first air cooling device 18 is adapted to communicate with the second flow channel 25 within the first side wall 21 on one side of the battery pack 100 along the width direction, while the second air cooling device 19 is adapted to communicate with the second flow channel 25 within the second side wall 22 on the other side of the battery pack 100 along the width direction. The first air cooling device 18 is adapted to receive air. Driven by the rotation of the fan within the first air cooling device 18, air flows through the through-holes 164 of the first air cooling device 18 mounting bracket 16 and the first flow channel 15 of the mounting base 11, into the second flow channel 25 of the first side wall 21, and then into the storage cavity, where it comes into contact with the battery cells, completing heat exchange with the cells. After completing heat exchange, the air flows into the second flow channel 25 of the second side wall 22. Driven by the rotation of the fan within the second air cooling device 19, the air flows from the second flow channel 25 to the first flow channel 15 of the second air cooling device 19, and then exits the battery pack 100 through the through-holes 164 of the second air cooling device 19 mounting bracket 16, completing the air circulation within the battery pack 100 and the heat exchange process.

[0093] Therefore, the first air cooling device 18 and the second air cooling device 19 are set to complete the circulation of airflow inside the battery pack 100. Through the setting of the second flow channel 25 on the side wall of the battery pack 100 tray 20, the smooth circulation of airflow is ensured, effectively improving the heat dissipation efficiency of the battery pack 100.

[0094] According to some embodiments of the present invention, Figure 2 As shown, the plurality of side walls include: at least one third side wall 23 , the third side wall 23 connects the first side wall 21 and the second side wall 22 , and the mounting hole 24 is provided on the third side wall 23 .

[0095] The third side wall 23 extends along the width of the battery pack 100. One end of the third side wall 23 along the width is connected to the first side wall 21, and the other end of the third side wall 23 along the width is connected to the second side wall 22. There may be two third side walls 23, which are spaced apart along the length of the battery pack 100. The mounting hole 24 is provided on one of the third side walls 23 at one end of the tray 20 along the length.

[0096] Thus, the third side wall 23 connects the first side wall 21 and the second side wall 22 to form a complete tray 20 structure. The mounting hole 24 is provided on the third side wall 23 to facilitate cooperation with the air cooling device 10 .

[0097] According to some embodiments of the present invention, Figure 2 As shown, there are multiple mounting holes 24, which are respectively arranged at both ends of the third side wall 23; at least one confluence hole is formed on the side adjacent to each other of the first side wall 21 and the second side wall 22, and the confluence holes are respectively connected to the adjacent mounting holes 24.

[0098] There can be two mounting holes 24, each of which mates with the first air cooling device 18 and the second air cooling device 19. These mounting holes 24 are located at either end of the third side wall 23 along the width of the battery pack 100. A confluence hole is formed between the first and second side walls 21, 22, along a section of the battery pack 100 adjacent to the third side wall 23. The confluence hole is located on the side of the first and second side walls 21, 22 adjacent to each other along the width of the battery pack 100. Airflow, driven by the air cooling device 10, flows through the mounting holes 24 and the confluence hole within the first and second flow channels 15, 25.

[0099] Therefore, the mounting holes 24 are provided at both ends of the third side wall 23, so that the airflow can flow through the second flow channel 25 of the first side wall 21 and the second side wall 22 and then flow out of the battery pack 100. The length of the first side wall 21 and the second side wall 22 is longer than that of the third side wall 23, which helps to extend the flow path of the airflow in the battery pack 100, thereby improving the heat exchange efficiency of the air cooling device 10 to the battery pack 100. The setting of the confluence hole facilitates the smooth flow of air.

[0100] According to some embodiments of the present invention, Figure 2 As shown, a plurality of air cooling devices 10 are arranged on the same side wall of the tray 20 .

[0101] Specifically, multiple air cooling devices 10 are positioned on the third sidewall 23 at one longitudinal end of the tray 20, allowing airflow to flow completely through the second flow channel 25, fully contacting the battery pack 100 for heat exchange, and then exiting the battery pack 100. Thus, the layout of the multiple air cooling devices 10 on the tray 20 helps improve the overall heat dissipation performance of the battery pack 100.

[0102] According to some embodiments of the present invention, Figure 2As shown, the tray 20 also includes: a first partition 26, the first partition 26 is arranged in the accommodating cavity, the first partition 26 is connected between the first side wall 21 and the third side wall 23, the first partition 26 and the first side wall 21 and the third side wall 23 define a third flow channel 28; and / or, the first partition 26 is connected between the second side wall 22 and the third side wall 23, the first partition 26 and the second side wall 22 and the third side wall 23 define a third flow channel 28, the third flow channel 28 is connected to the confluence hole and the mounting hole 24 adjacent to each other.

[0103] The first partition 26 is disposed obliquely between the first sidewall 21 and the third sidewall 23. One end of the first partition 26 is connected to the third sidewall 23, and the other end of the first partition 26 extends obliquely along the width direction toward the first sidewall 21, with the other end of the first partition 26 connected to the first sidewall 21. Alternatively, the first partition 26 is disposed obliquely between the second sidewall 22 and the third sidewall 23. One end of the first partition 26 is connected to the third sidewall 23, and the other end of the first partition 26 extends obliquely along the width direction toward the second sidewall 22, with the other end of the first partition 26 connected to the second sidewall 22. The airflow introduced through the first air cooling device 18 flows sequentially through the first flow channel 15 and the third flow channel 28 before entering the second flow channel 25. After completing heat exchange in the second flow channel 25, the airflow passes through the third flow channel 28 and the first flow channel 15 on the side of the second air cooling device 19 before exiting the battery pack 100.

[0104] Therefore, the setting of the first partition 26 is convenient for defining the third flow channel 28 together with the tray 20. The third flow channel 28 can play a certain buffering role, buffering the airflow entering or flowing out of the battery pack 100, and the third flow channel 28 is suitable for connecting the confluence hole and the mounting hole 24, so as to facilitate guiding the flow direction of the airflow so that the airflow can flow smoothly between the first flow channel 15 and the second flow channel 25.

[0105] According to some embodiments of the present invention, Figure 2 As shown, the tray 20 also includes: a plurality of second partitions 27, which are spaced apart between the first side wall 21 and the second side wall 22, and the plurality of partitions divide the accommodating cavity into a plurality of sub-chambers; the battery pack 100 also includes: a plurality of battery cell groups 30, which are respectively arranged in the plurality of sub-chambers.

[0106] The second partition 27 extends along the width direction of the battery pack 100, one end of the second partition 27 along the width direction of the battery pack 100 is connected to the first side wall 21, and the other end of the second partition 27 along the width direction of the battery pack 100 is connected to the second side wall 22. Multiple second partitions 27 are evenly spaced along the length direction of the battery pack 100, and multiple second partitions 27 divide the accommodating cavity into multiple sub-chambers.

[0107] Thus, the plurality of second partitions 27 divide the accommodating chamber into a plurality of sub-chambers, which can more effectively manage airflow and heat distribution, thereby improving heat dissipation efficiency. The plurality of battery cell groups 30 are respectively arranged in the plurality of sub-chambers, which can more conveniently manage and maintain the battery cells and also facilitate the design of the heat dissipation system.

[0108] According to some embodiments of the present invention, Figure 2 As shown, the battery cell group 30 and the side wall of the sub-chamber define at least one fourth flow channel 29 , and the fourth flow channel 29 is connected to at least one second flow channel 25 in the first side wall 21 and the second side wall 22 .

[0109] The cell group 30 is spaced apart from the adjacent second separator 27 along the length of the battery pack 100. The gap between the second separator 27 and the cell group 30 forms a fourth flow channel 29. A flow channel hole is formed on the side of at least one of the first and second side walls 21 and 22 adjacent to the sub-chamber. The fourth flow channel 29 faces the flow channel hole and is connected to the second flow channel 25 through the flow channel hole. Gas within the second flow channel 25 in the first side wall 21 enters the fourth flow channel 29 through the flow channel. After heat exchange with the cell group 30 in the sub-chamber, the gas flows through the flow channel opening in the second side wall 22 and flows out of the second flow channel 25 in the second side wall 22.

[0110] Therefore, through the design of the second partition 27 and the fourth flow channel 29, the air flow can enter the interior of the battery pack 100 more evenly and fully contact the battery cells through the fourth flow channel 29, thereby improving the heat dissipation efficiency.

[0111] According to some embodiments of the present invention, Figure 2 As shown, the battery pack 100 also includes a temperature sensor, and the battery management device includes: a liquid cooling device, which is arranged at the bottom of the tray 20, the battery cell group 30 is in contact with the liquid cooling device, and the temperature sensor is electrically connected to the liquid cooling device and the air cooling device 10 respectively.

[0112] The battery management system includes multiple air cooling devices 10 and liquid cooling devices, which are used to regulate the temperature within the battery pack 100. The air cooling devices 10 are designed to flow air within the battery pack 100, thereby achieving heat exchange with the battery cells. The liquid cooling devices cool the battery cell pack 30 using liquid. The liquid cooling devices are located at the bottom of the tray 20, and the bottom of the battery cell pack 30 contacts the liquid cooling devices, cooling the battery cell pack 30 through liquid, achieving efficient heat conduction and heat dissipation. Temperature sensors are electrically connected to the liquid cooling devices and air cooling devices 10, respectively, to monitor the temperature within the battery pack 100 and adjust the cooling strategy based on the temperature signals.

[0113] Therefore, by integrating the air cooling device 10 and the liquid cooling device into the setting of the battery pack 100, the combined application of the air cooling device 10 and the liquid cooling device can provide an efficient heat dissipation strategy for the battery pack 100, and achieve accurate temperature monitoring through the temperature sensor, thereby improving the overall performance and safety of the battery pack 100.

[0114] According to a control method for a battery pack 100 according to an embodiment of a third aspect of the present invention, the control method is used to control the battery pack 100 according to the embodiment of the second aspect of the present invention, and the method steps include: a temperature sensor of the battery pack 100 is disposed in a receiving cavity of the battery pack 100; the temperature sensor obtains the temperature inside the battery pack 100; the temperature of the temperature sensor obtained by a battery management device of the battery pack 100 is less than or equal to a first preset temperature, at which time the temperature of the battery pack 100 is low and the cooling device does not need to be turned on, and the air cooling device 10 and the liquid cooling device of the battery pack 100 are turned off; the temperature of the temperature sensor obtained by the battery management device is greater than the first preset temperature and less than or equal to a second preset temperature, the liquid cooling device is turned on, at which time the temperature of the battery pack 100 rises but is still within a controllable range, and only the liquid cooling device needs to be turned on for preliminary heat conduction and heat dissipation; the temperature of the temperature sensor obtained by the battery management device is greater than the second preset temperature and less than or equal to a third preset temperature, the liquid cooling device and the air cooling device 10 are turned on, at which time the temperature of the battery pack 100 is high and both the liquid cooling device and the air cooling device 10 need to be turned on simultaneously to ensure that the temperature of the battery pack 100 is within a reasonable range.

[0115] According to the control method of the battery pack 100 according to the embodiment of the present invention, the internal temperature of the battery pack 100 is monitored in real time by a temperature sensor, and the working state of the cooling device is adjusted according to different temperature ranges to ensure that the internal temperature of the battery pack 100 is maintained within a safe range. Different cooling strategies are adopted in different temperature ranges to ensure heat dissipation efficiency and avoid unnecessary energy consumption. Through a multi-stage temperature control strategy, it is ensured that the cooling system can be activated in time under high temperature conditions to prevent safety hazards caused by battery overheating, which can effectively improve the safety and energy efficiency of the battery pack 100 and improve the overall performance and reliability of the battery pack 100.

[0116] According to some embodiments of the present invention, there are multiple temperature sensors, including a first temperature sensor and a second temperature sensor, one of the first temperature sensor and the second temperature sensor is arranged in the accommodating cavity, and the other of the first temperature sensor and the second temperature sensor is arranged in the second flow channel 25 of the battery pack 100, and the first temperature sensor and the second temperature sensor are electrically connected to the battery management system.

[0117] It is assumed that the first temperature sensor is disposed in the accommodating cavity to obtain the temperature value of the battery core, and the second temperature sensor is disposed in the second flow channel 25 to obtain the temperature value in the second flow channel 25 .

[0118] Therefore, by detecting the temperature of the battery cell group 30 in the accommodating cavity and the temperature in the second flow channel 25, the battery management system can also adjust the working state of the cooling device to ensure that the internal temperature of the battery pack 100 is maintained within a safe range.

[0119] The method according to the second aspect of the present invention further includes: when the temperature difference between the first temperature sensor and the second temperature sensor is greater than a fourth preset temperature, the air cooling device 10 is turned on.

[0120] Convective heat transfer Q = Ah(t1-t2), where A is the surface area, h is the heat transfer coefficient, t1 is the temperature detected by the first temperature sensor, and t2 is the temperature detected by the second temperature sensor. When the temperature difference between the first and second temperature sensors exceeds a fourth preset temperature, the air cooling device 10 activates, transforming the air within the battery pack 100 from static to forced convection. This increases the heat transfer coefficient by approximately 100 times, allowing the hot air within the chamber to exchange with the cold air within the second flow channel 25, effectively improving the cooling efficiency of the battery pack 100.

[0121] The vehicle according to the fourth embodiment of the present invention includes the air cooling device 10 according to the first embodiment of the present invention, or the battery pack 100 according to the second embodiment of the present invention, or the control method according to the third embodiment of the present invention.

[0122] According to the vehicle of the embodiment of the present invention, by integrating a high-efficiency air cooling device 10, an optimized battery pack 100 design and a precise control method, it is possible not only to effectively improve the heat dissipation performance of the vehicle, but also to enhance its safety and energy efficiency, thereby improving the overall performance and reliability of the vehicle.

[0123] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0124] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact via another feature between them. In the description of the present invention, a first feature being "above", "above" and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0125] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0126] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An air cooling device (10), characterized in that: The air cooling device (10) comprises: Mounting seat (11); a first driving member (13), the first driving member (13) being arranged on the mounting seat (11); A fan blade (12), the fan blade (12) being connected to the first driving member (13), and the first driving member (13) being suitable for driving the fan blade (12) to rotate; A waterproof and breathable membrane (14), wherein the waterproof and breathable membrane (14) is provided at one end of the mounting seat (11) away from the fan blade (12).

2. The air cooling device (10) according to claim 1, characterized in that: The waterproof and breathable membrane (14) is made of a polymer material.

3. The air cooling device (10) according to claim 1, characterized in that: The mounting seat (11) is formed with a first flow channel (15), the waterproof breathable membrane (14) is provided at one end of the first flow channel (15), and the waterproof breathable membrane (14) covers the first flow channel (15).

4. The air cooling device (10) according to claim 3, characterized in that: Also includes: A mounting bracket (16) is provided at one end of the mounting seat (11) away from the fan blade (12), the mounting bracket (16) is connected to the mounting seat (11), and the waterproof breathable membrane (14) is provided between the mounting bracket (16) and the mounting seat (11).

5. The air cooling device (10) according to claim 4, characterized in that: One of the mounting seat (11) and the mounting bracket (16) is formed with a matching groove (111), and the other of the mounting seat (11) and the mounting bracket (16) is formed with a matching protrusion (163), the matching protrusion (163) and the matching groove (111) are detachably matched, and the waterproof breathable membrane (14) is arranged in the matching groove (111).

6. The air cooling device (10) according to claim 5, characterized in that The mounting bracket (16) comprises: Protective cover (161); An extension portion (162), one end of the extension portion (162) is connected to the protective cover (161), the other end of the extension portion (162) is detachably connected to the mounting seat (11), and the extension portion (162) is formed with at least one of the mating groove (111) and the mating protrusion (163).

7. The air cooling device (10) according to claim 6, characterized in that The extension portion (162) is formed with at least one through hole (164), and the through hole (164) is in communication with the first flow channel (15).

8. The air cooling device (10) according to claim 7, characterized in that There are a plurality of through holes (164), and the plurality of through holes (164) are arranged at intervals along the circumference of the protective cover (161), and the central axis of the through hole (164) is perpendicular to the central axis of the first flow channel (15).

9. The air cooling device (10) according to claim 1, characterized in that The air cooling device (10) further includes: An elastic component is connected to the mounting seat (11), the elastic component is arranged at an end of the mounting seat (11) away from the fan blade (12), and the elastic component has a compressed first position and an extended second position. When the elastic component moves from the first position to the second position, the elastic component penetrates the waterproof breathable membrane (14).

10. The air cooling device (10) according to claim 9, characterized in that The elastic component comprises: Spring thimble (17); A second driving member is connected to the spring ejector pin (17), and the second driving member drives the spring ejector pin (17) to move between the first position and the second position.

11. The air cooling device (10) according to claim 10, characterized in that The second driving member drives the spring ejector pin (17) to remain in the first position; and / or, The second driving member drives the spring ejector pin (17) to remain in the second position.

12. The air cooling device (10) according to any one of claims 1 to 11, characterized in that: A sealing groove (112) is formed on the mounting seat (11), and the sealing groove (112) is provided at one end of the mounting seat (11) facing the fan blade (12); It also includes a sealing member (113), wherein the sealing member (113) is arranged in the sealing groove (112).

13. The air cooling device (10) according to claim 12, characterized in that At least a portion of the sealing member (113) protrudes from a side surface of the mounting seat (11) facing the fan blade (12).

14. A battery pack (100), characterized in that: include: A tray (20), wherein the tray (20) is formed with at least one accommodating cavity; At least one battery cell group (30), the battery cell group (30) being arranged in the accommodating cavity; A battery management device, the battery management device comprising an air cooling device (10), the air cooling device (10) being arranged on the tray (20), the air cooling device (10) being suitable for forming convection between the air inside the battery pack (100) and the air outside, the air cooling device (10) being the air cooling device (10) according to any one of claims 1 to 13.

15. The battery pack (100) according to claim 14, characterized in that: The tray (20) comprises: At least one side wall is formed with a mounting hole (24), the mounting hole (24) passes through the side wall, the mounting hole (24) communicates with the inside and outside of the tray (20), and at least a portion of the air cooling device (10) cooperates with the mounting hole (24).

16. The battery pack (100) according to claim 15, characterized in that The side wall is formed with a second flow channel (25), and the second flow channel (25) is connected to the accommodating cavity and the first flow channel (15) of the air cooling device (10).

17. The battery pack (100) according to claim 16, characterized in that There are multiple side walls, and the multiple side walls include a first side wall (21) and a second side wall (22) that are arranged opposite to each other, and the second flow channel (25) is provided in both the first side wall (21) and the second side wall (22); There are multiple air cooling devices (10), and the multiple air cooling devices (10) are respectively arranged at the mounting holes (24). One end of the multiple second flow channels (25) is connected to the accommodating cavity, and the other end of the multiple second flow channels (25) is respectively connected to the air cooling devices (10).

18. The battery pack (100) according to claim 17, characterized in that The plurality of air cooling devices (10) include: A first air cooling device (18) and a second air cooling device (19), wherein the first air cooling device (18) and the second air cooling device (19) are respectively connected to the second flow channel (25) in the first side wall (21) and the second side wall (22), and the airflow directions in the first air cooling device (18) and the second air cooling device (19) are opposite.

19. The battery pack (100) according to claim 17, characterized in that The plurality of side walls include: At least one third side wall (23), the third side wall (23) connecting the first side wall (21) and the second side wall (22), and the mounting hole (24) being provided on the third side wall (23).

20. The battery pack (100) according to claim 19, characterized in that There are a plurality of mounting holes (24), and the plurality of mounting holes (24) are respectively arranged at both ends of the third side wall (23); At least one confluence hole is formed on each of the adjacent sides of the first side wall (21) and the second side wall (22), and the confluence holes are respectively communicated with the adjacent mounting holes (24).

21. The battery pack (100) according to claim 20, characterized in that The plurality of air cooling devices (10) are arranged on the same side wall of the tray (20).

22. The battery pack (100) according to claim 20, characterized in that The tray (20) further comprises: a first partition (26), the first partition (26) being disposed in the accommodating cavity, the first partition (26) being connected between the first side wall (21) and the third side wall (23), the first partition (26) defining a third flow channel (28) together with the first side wall (21) and the third side wall (23); and / or The first partition (26) is connected between the second side wall (22) and the third side wall (23), and the first partition (26), the second side wall (22) and the third side wall (23) define a third flow channel (28), and the third flow channel (28) is communicated with the confluence hole and the mounting hole (24) adjacent to each other.

23. The battery pack (100) according to claim 17, characterized in that The tray (20) further comprises: a plurality of second partitions (27), the plurality of second partitions (27) being spaced apart between the first side wall (21) and the second side wall (22), the plurality of partitions dividing the accommodating cavity into a plurality of sub-chambers; The battery pack (100) further comprises: a plurality of battery cell groups (30), wherein the plurality of battery cell groups (30) are respectively arranged in the plurality of sub-cavities.

24. The battery pack (100) according to claim 23, characterized in that The battery cell group (30) and the side wall of the sub-chamber define at least one fourth flow channel (29), and the fourth flow channel (29) is connected to at least one second flow channel (25) in the first side wall (21) and the second side wall (22).

25. The battery pack (100) according to claim 14, characterized in that The battery pack (100) further includes a temperature sensor, The battery management device comprises: a liquid cooling device, the liquid cooling device is arranged at the bottom of the tray (20), the battery cell group (30) is in contact with the liquid cooling device, and the temperature sensor is electrically connected to the liquid cooling device and the air cooling device (10) respectively.

26. A method for controlling a battery pack (100), characterized in that: The control method is used to control the battery pack (100) according to any one of claims 14 to 25, and the method steps include: The temperature sensor of the battery pack (100) is arranged in the accommodating cavity of the battery pack (100); The temperature sensor acquires the temperature inside the battery pack (100); The battery management device of the battery pack (100) obtains that the temperature of the temperature sensor is less than or equal to a first preset temperature, and the air cooling device (10) and the liquid cooling device of the battery pack (100) are turned off; The temperature of the temperature sensor obtained by the battery management device is greater than the first preset temperature and less than or equal to the second preset temperature, and the liquid cooling device is turned on; The temperature of the temperature sensor acquired by the battery management device is greater than the second preset temperature and less than or equal to the third preset temperature, and the liquid cooling device and the air cooling device (10) are turned on.

27. The control method of the battery pack (100) according to claim 26, characterized in that: There are multiple temperature sensors, including a first temperature sensor and a second temperature sensor. One of the first temperature sensor and the second temperature sensor is arranged in the accommodating cavity, the other of the first temperature sensor and the second temperature sensor is arranged in the second flow channel (25) of the battery pack (100), and the first temperature sensor and the second temperature sensor are electrically connected to the battery management system.

28. The control method of the battery pack (100) according to claim 27, characterized in that: The method steps also include: The temperature difference between the first temperature sensor and the second temperature sensor is greater than a fourth preset temperature, and the air cooling device (10) is turned on.

29. A vehicle, characterized in that: The invention comprises an air cooling device (10) according to any one of claims 1 to 13, a battery pack (100) according to any one of claims 14 to 25, or a control method for a battery pack (100) according to any one of claims 26 to 28.

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