Secondary battery and unmanned aerial vehicle

Abstract

The utility model relates to a secondary battery and an unmanned aerial vehicle, and belongs to the technical field of unmanned aerial vehicles. The secondary battery comprises: a case provided with a hollow area; the battery body is mounted in the shell, the battery body comprises at least one battery monomer, the battery monomer comprises a battery shell, at least one fin is arranged on the surface of the battery shell, and the fin corresponds to the hollow area; according to the present invention, the fins are arranged on the battery shell of the battery monomer, such that the secondary battery has the large heat dissipation area, and the fins are arranged in the hollow region of the secondary battery shell so as to increase the heat dissipation of the secondary battery to the outside, such that the performance of the secondary battery is improved, and the service life of the secondary battery is prolonged. Meanwhile, the fins are arranged, so that the probability that hard particles such as broken stones directly collide with the battery shell when the battery is collided, falls down and the like in the use process of the battery can be reduced, a relatively good protection effect is achieved on the battery monomer, and the safety of the secondary battery is further improved.

Description

Technical Field

[0001] This application relates to the field of unmanned aerial vehicle (UAV) technology, and more specifically, to a secondary battery and a UAV. Background Technology

[0002] With the rapid development of drone technology, drones are increasingly being used in various fields of production and life. For example, drones can be widely used in agricultural plant protection, aerial photography, inspection, surveying and mapping, reconnaissance and other aspects.

[0003] To ensure optimal flight performance, the capacity of drone rechargeable batteries is limited, currently enabling only short-duration flights. Furthermore, rechargeable batteries require long charging times. Therefore, a single drone typically uses multiple rechargeable batteries, which are cyclically charged to achieve continuous flight. To address this issue, some have proposed rechargeable batteries with high charging rates; however, these batteries generate significant heat during charging and discharging, impacting their performance and lifespan. Utility Model Content

[0004] The purpose of this application is to provide a secondary battery and a drone, which increases the heat dissipation of the secondary battery to improve its performance and lifespan.

[0005] In a first aspect, embodiments of this application provide a secondary battery, the secondary battery comprising:

[0006] The casing has a perforated area;

[0007] The battery body is installed inside the housing. The battery body includes at least one battery cell. The battery cell includes a battery shell. The surface of the battery shell is provided with at least one fin, and the fin corresponds to the hollow area.

[0008] In the above implementation process, by incorporating fins on the battery casing of the individual battery cells, the secondary battery gains a larger heat dissipation area. Furthermore, the fins are positioned within the perforated areas of the secondary battery casing, increasing heat dissipation and improving battery performance and lifespan. Simultaneously, the fins reduce the probability of hard particles such as gravel directly colliding with the battery casing during impacts or drops, providing better protection for the individual battery cells and thus enhancing the safety of the secondary battery.

[0009] As an alternative implementation, the fins are located at the corners of the battery casing.

[0010] In the above implementation process, by setting the fins at the corners of the battery casing, the probability of particles such as gravel directly colliding with the battery casing during use can be further reduced, thereby further improving the safety of the secondary battery.

[0011] As an optional implementation, the fins include at least two, and the interval between two adjacent fins does not exceed 9 mm.

[0012] In the above implementation process, the smaller the impacting particles, the lower the probability of damage to the battery cells. Typically, the safe collision space inside the battery is reserved at about 9mm. By controlling the interval between two adjacent fins to not exceed 9mm, it is possible to prevent large particles larger than 9mm from directly impacting the battery casing, reducing the probability of damage to the battery cells and thus improving the safety of the secondary battery.

[0013] As an optional implementation, the sum of the height of the fins and the thickness of the battery casing along the thickness direction is not less than 5 mm.

[0014] In the above implementation process, the greater the sum of the fin height and the battery casing thickness, the better the impact resistance. By controlling the sum of the fin height and the battery casing thickness to be no less than 5mm, a good impact resistance effect can be achieved, improving the safety of the secondary battery. Of course, it is understandable that the greater the fin height, the better the heat dissipation effect. Therefore, controlling the sum of the fin height and the battery casing thickness to be no less than 5mm also helps to dissipate heat from the secondary battery.

[0015] As an alternative implementation, the end face of the fin away from the battery casing is arc-shaped.

[0016] In the above implementation process, by setting the end face of the fins away from the battery casing to an arc shape, the possibility of injury to people during the handling of secondary batteries can be reduced.

[0017] As an alternative implementation, the fins are continuous.

[0018] In the above implementation process, by setting the fins to be continuous, it is beneficial to the heat dissipation and impact resistance of the secondary battery, and at the same time, it can also reduce the possibility of injury to people when handling the secondary battery.

[0019] As an optional implementation, the number of battery cells is at least two, with a gap between adjacent battery cells.

[0020] In the above implementation process, by setting gaps between battery cells, the heat dissipation effect of the secondary battery can be further increased.

[0021] As an alternative implementation, the housing includes a bottom shell, which has a slot that matches the fins.

[0022] In the above implementation process, by setting a slot on the bottom shell that matches the fins, the positioning of the battery cells can be quickly achieved when assembling the secondary battery, which helps to improve the assembly efficiency of the secondary battery.

[0023] As an alternative implementation, the housing includes a top cover, with a perforated area located between the top cover and the bottom cover.

[0024] Secondly, embodiments of this application provide a drone, which includes the secondary battery provided in the first aspect.

[0025] As an alternative implementation, the drone includes rotor blades, with a secondary battery mounted below the rotor blades, and the extension direction of the blades is parallel to the rotation center axis of the rotor blades.

[0026] In the above implementation process, by placing the secondary battery below the propeller and making the extension direction of the fins parallel to the rotation center axis of the propeller, the wind generated by the propeller during the flight of the UAV can effectively carry away the heat of the fins, which is beneficial to the heat dissipation of the secondary battery.

[0027] As an optional implementation, the drone can have a preset forward direction, and the extension direction of the gap between the battery cells is parallel to the preset forward direction.

[0028] In the above implementation process, by making the extension direction of the gap between the battery cells parallel to the preset forward direction, the airflow can pass through the gap between the battery cells during the flight of the UAV, which is beneficial to the heat dissipation of the secondary battery. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a secondary battery provided in an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the battery casing provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the structure of the top cover provided in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the structure of the upper cover body provided in an embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of the waterproof ring provided in the embodiments of this application;

[0035] Figure 6 This is a cross-sectional schematic diagram of the waterproof ring provided in an embodiment of this application.

[0036] Reference numerals: 1-Shell; 11-Hollowed area; 12-Bottom shell; 13-Top cover; 131-Top cover body; 1311-Receiving cavity; 1312-Anti-slip protrusion; 1313-Waterproof protrusion; 1314-Ventilation valve; 1315-Heat dissipation fins; 132-Connector; 133-Waterproof ring; 1331-Mounting port; 1332-Anti-slip through hole; 1333-Sealing part; 1334-Side wall part; 1335-Flanged part; 1336-Anti-deformation protrusion; 1337-Waterproof groove; 2-Battery cell; 21-Battery shell; 22-Fins; 3-Gap; 4-Conductive substrate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] This application provides a secondary battery that can be used in devices such as drones, automobiles, and home appliances that require batteries as power sources. This embodiment of the invention only uses the battery assembly for drones as an example for illustration; other application scenarios can be referred to accordingly.

[0041] Drones can include, but are not limited to, any of the following: patrol / surveillance drones, agricultural drones, meteorological drones, exploration drones, surveying drones, reconnaissance drones, decoy drones, electronic warfare drones, and communication relay drones. The following explanation uses agricultural drones as an example; other types of drones can be explained in the same way.

[0042] The drone may specifically include: a fuselage, rotor blades mounted on the fuselage, and a removable secondary battery mounted on the fuselage, with the secondary battery located below the rotor blades.

[0043] Figure 1 For a schematic diagram of the secondary battery provided in the embodiments of this application, please refer to [link / reference]. Figure 1 This application provides a secondary battery, which includes a casing 1 and a battery body. The casing 1 includes an upper cover 13 and a bottom cover 12. The casing 1 also has a hollow area 11 located between the upper cover 13 and the bottom cover 12. The battery body is installed inside the casing 1 and located between the upper cover 13 and the bottom cover 12. The battery body includes at least one battery cell 2, and the battery cell 2 includes a battery casing 21. Figure 2 Please refer to the structural schematic diagram of the battery casing 21 provided in the embodiments of this application. Figure 2 The surface of the battery casing 21 is provided with at least one fin 22, which corresponds to the hollow area 11.

[0044] The hollow area 11 can be a partially hollowed-out part of the intermediate shell 1 between the upper cover 13 and the bottom shell 12 of the shell 1, or it can be a completely hollowed-out part where there is no intermediate shell 1 between the upper cover 13 and the bottom shell 12, or it can be a part where several connecting columns are set to connect the upper cover 13 and the bottom shell 12 to increase the strength of the shell 1.

[0045] This secondary battery features fins 22 on the battery casing 21 of the battery cell 2, providing a larger heat dissipation area. The fins 22 are positioned within the open area 11 of the battery casing 21, increasing heat dissipation and improving battery performance and lifespan. Furthermore, the fins 22 reduce the probability of hard particles such as gravel directly impacting the battery casing 21 during use, such as when the battery is bumped or dropped, thus providing better protection for the battery cell 2 and enhancing the safety of the secondary battery.

[0046] In some embodiments, the fins 22 are disposed at the corners of the battery casing 21. The corners are the connection areas between the two surfaces of the battery casing 21. Taking the battery casing 21 as a cuboid as an example, its sides are a first side, a second side, a third side, and a fourth side connected in sequence. Taking the first side as an example, the fins 22 are disposed at the edge where the first side connects to the second and fourth sides. By placing the fins 22 at the corners of the battery casing 21, the probability of particles such as gravel directly colliding with the battery casing 21 during use can be further reduced, thereby further improving the safety of the secondary battery.

[0047] In some embodiments, the fins 22 include at least two, and the interval between two adjacent fins 22 does not exceed 9 mm. The smaller the impacting particle, the lower the probability of damage to the battery cell 2. Typically, the safe collision space inside the battery is reserved at about 9 mm. By controlling the interval between two adjacent fins 22 to not exceed 9 mm, it is possible to prevent large particles larger than 9 mm from directly impacting the battery casing 21, reducing the probability of damage to the battery cell 2, and thus improving the safety of the secondary battery.

[0048] It should be noted that two adjacent fins 22 can be disposed on one battery casing 21, or they can be disposed on the battery casing 21 of adjacent battery cells 2 respectively.

[0049] In some embodiments, along the thickness direction of the battery casing 21, the sum of the height of the fins 22 and the thickness of the battery casing 21 is not less than 5 mm. The larger the sum of the height of the fins 22 and the thickness of the battery casing 21, the better the impact resistance. By controlling the sum of the height of the fins 22 and the thickness of the battery casing 21 to be not less than 5 mm, a better impact resistance effect can be achieved, improving the safety of the secondary battery. Of course, it is understandable that a larger fin height 22 is more conducive to heat dissipation; therefore, controlling the sum of the height of the fins 22 and the thickness of the battery casing 21 to be not less than 5 mm is also beneficial for heat dissipation of the secondary battery. Typically, the height of the fins 22 can be designed according to the actual heat dissipation requirements of the secondary battery, but to ensure the impact resistance of the secondary battery, the sum of the height of the fins 22 and the thickness of the battery casing 21 must be not less than 5 mm.

[0050] In some embodiments, the end face of the fin 22 away from the battery casing 21 is arc-shaped. By setting the end face of the fin 22 away from the battery casing 21 to an arc shape, the possibility of injury to a person during the handling of the secondary battery can be reduced.

[0051] In some embodiments, the fins 22 are continuous. Continuous fins 22 means that no other fins 22 extend along the same direction as a single fin. In other words, a single fin 22 extends from one end of the battery casing 21 to the other without interruption. Making the fins 22 continuous improves heat dissipation and impact resistance of the secondary battery, while also reducing the possibility of injury to people during handling.

[0052] Furthermore, the extension direction of fin 22 is parallel to the rotation center axis of the rotor. By placing the secondary battery below the rotor and making the extension direction of fin 22 parallel to the rotation center axis of the rotor, the wind generated by the rotor during the flight of the UAV can effectively carry away the heat of fin 22, which is beneficial to the heat dissipation of the secondary battery.

[0053] In some embodiments, the number of battery cells 2 is at least two, and there is a gap 3 between adjacent battery cells 2. By providing gaps 3 between battery cells 2, the heat dissipation effect of the secondary battery can be further increased.

[0054] Furthermore, the extension direction of the gap 3 between the battery cells 2 is parallel to the preset forward direction. By making the extension direction of the gap 3 between the battery cells 2 parallel to the preset forward direction, airflow can pass through the gap 3 between the battery cells 2 during the flight of the UAV, which is beneficial for the heat dissipation of the secondary battery.

[0055] In some embodiments, the bottom shell 12 is provided with a slot that matches the fins 22. By providing a slot on the bottom shell 12 that matches the fins 22, the positioning of the battery cell 2 can be quickly achieved during the assembly of the secondary battery, which helps to improve the assembly efficiency of the secondary battery.

[0056] In some embodiments, Figure 3 Please refer to the structural schematic diagram of the upper cover 13 provided in the embodiment of this application. Figure 3 The top cover 13 includes a top cover body 131, a connector 132, and a waterproof ring 133. Figure 4 For a schematic diagram of the structure of the upper cover body 131 provided in the embodiments of this application, please refer to [link / reference]. Figure 4 The upper cover body 131 is provided with a receiving cavity 1311 and multiple anti-slip protrusions 1312, and the multiple anti-slip protrusions 1312 are arranged at intervals around the receiving cavity 1311; Figure 5 This is a schematic diagram of the structure of the waterproof ring 133 provided in the embodiments of this application. Figure 6 For a cross-sectional view of the waterproof ring 133 provided in the embodiments of this application, please refer to... Figure 5 and Figure 6The waterproof ring 133 is provided with an installation port 1331 and multiple anti-slip through holes 1332. The waterproof ring 133 is installed in the receiving cavity 1311, and the anti-slip through holes 1332 cooperate with the anti-slip protrusions 1312. The connector 132 is installed in the installation port 1331. The waterproof ring 133 is interference-fitted with the upper cover body 131 and the connector 132. The battery body is installed in the housing 1, and the battery cell 2 and the connector 132 are electrically connected.

[0057] Specifically, connector 132 can be a connector 132 disposed on the battery end, and connector 132 can be used to connect with connector 132 on the drone end to connect the secondary battery to the drone. For example, the connector 132 of the secondary battery is a plug connector 132, and the connector 132 of the drone is a socket connector 132, or the connector 132 of the secondary battery is a socket connector 132, and the connector 132 of the drone is a plug connector 132. This application embodiment does not limit this.

[0058] In some embodiments, the anti-slip protrusions 1312 are spaced 5mm to 15mm apart. By controlling the spacing of the anti-slip protrusions 1312 to be 5mm to 15mm, a better tensile effect can be achieved on the waterproof ring 133, thereby reducing the probability of deformation of the waterproof ring 133 and maintaining a good waterproof effect.

[0059] In some embodiments, the length of the anti-slip protrusion 1312 is 5mm to 15mm. By controlling the length of the anti-slip protrusion 1312 to be 5mm to 15mm, a better tensile effect can be achieved on the waterproof ring 133, thereby reducing the probability of deformation of the waterproof ring 133 and maintaining a good waterproof effect.

[0060] Since the waterproof ring 133 is located outside the connector 132 and at least partially between the upper cover body 131 and the connector 132, and the waterproof ring 133 and the upper cover body 131 are interference-fitted, water or working fluid in the environment can be prevented from entering the secondary battery through the gap between the connector 132 and the upper cover body 131 during the floating process of the connector 132. This improves the waterproof performance of the secondary battery, avoids short circuit faults inside the secondary battery, and improves the safety of the secondary battery.

[0061] In some embodiments, the shape of the receiving cavity 1311 matches the shape of the connector 132, the connector 132 is embedded in the receiving cavity 1311, and a receiving gap is formed between the connector 132 and the cover body 131; at least a portion of the thickness of the waterproof ring 133 is greater than the width of the receiving gap, so that the cover body 131 applies a pre-pressure to the waterproof ring 133.

[0062] It should be noted that the gap between the connector 132 and the upper cover body 131 can be: a reasonable installation gap that needs to be reserved to facilitate the installation of the connector 132 into the receiving cavity 1311 of the upper cover body 131. The width of the gap can be the distance between the inner wall of the upper cover body 131 and the outer wall of the connector 132 in the direction from the upper cover body 131 to the connector 132. Correspondingly, the thickness of the waterproof ring 133 can be: the distance between the surface of the waterproof ring 133 and the upper cover body 131 and the surface adjacent to the connector 132 in the direction from the upper cover body 131 to the connector 132 when the waterproof ring 133 is embedded in the gap. That is, at least a portion of the thickness of the waterproof ring 133 is greater than the width of the gap, which can be: the distance between the surface of the waterproof ring 133 and the upper cover body 131 and the surface adjacent to the connector 132 in the direction from the upper cover body 131 to the connector 132 is at least partially greater than the distance between the inner wall of the upper cover body 131 and the outer wall of the connector 132.

[0063] Understandably, in practical applications, the thickness of the waterproof ring 133 may be uniform or non-uniform. However, at least part of the thickness of the waterproof ring 133 is greater than the width of the gap, so that the waterproof ring 133 can seal the gap and prevent water from the outside or environment from entering the interior of the secondary battery through the gap.

[0064] Specifically, since at least a portion of the thickness of the waterproof ring 133 is greater than the width of the gap, when the waterproof ring 133 is embedded in the gap, the upper cover body 131 can compress the portion of the waterproof ring 133 that is larger than the gap, thereby creating a pre-compression effect on the waterproof ring 133 and achieving the effect of pre-compression waterproofing.

[0065] In some embodiments, the secondary battery further includes a conductive substrate 4, which is a printed circuit board. A connector 132 is fixed to the conductive substrate 4 and electrically connected to it. The conductive substrate 4 is movably connected to the upper cover body 131 and is disposed within the inner cavity of the upper cover body 131, allowing the connector 132 to be movably connected to the upper cover body 131. The battery body and the conductive substrate 4 are electrically connected. By using a printed circuit board as the circuit path between the battery body and the connector 132, the use of numerous wire harnesses for connection can be avoided, increasing the reliability and safety of the secondary battery.

[0066] Specifically, the connector 132 can be fixed to the conductive substrate 4 using a connection method such as welding or fastener connection, and achieves electrical connection with the battery body through the conductive substrate 4. Since the conductive substrate 4 is movably connected to the upper cover body 131, the connector 132 can correspondingly be movably connected to the upper cover body 131 through the conductive substrate 4, achieving a floating effect. In one embodiment, the conductive substrate 4 is a circuit board.

[0067] In some embodiments, the connector 132 has a plug-in port on the side away from the conductive substrate 4; the upper cover body 131 has an opening opposite the plug-in port, the area of ​​which is larger than the area of ​​the plug-in port; the waterproof ring 133 includes a sealing portion 1333, a sidewall portion 1334, and a flange portion 1335 connected in sequence. The sealing portion 1333 is used to seal the gap between the plug-in port and the opening, the sidewall portion 1334 is embedded between the sidewall of the upper cover body 131 and the sidewall of the connector 132, and the flange portion 1335 is embedded between the upper cover body 131 and the conductive substrate 4. It is understood that, in addition to its waterproof function, the waterproof ring 133, due to its elasticity, can also provide shock absorption between the battery and its mating components, such as drones or chargers.

[0068] Specifically, the connector 132 can be plugged into and plugged into the connector 132 on the drone side via the plug-in port. Since the upper cover body 131 has an opening at a position opposite to the plug-in port, and the area of ​​the opening is larger than the area of ​​the plug-in port, the upper cover body 131 can avoid blocking the plug-in port, making it easier for the plug-in port to be plugged into and plugged into the connector 132 on the drone side.

[0069] In some embodiments, the sidewall portion 1334 is provided with anti-deformation protrusions 1336. By providing anti-deformation protrusions 1336 in the sidewall portion 1334, the deformation resistance of the waterproof ring 133 can be further increased, thereby further reducing the probability of deformation of the waterproof ring 133 and maintaining a better waterproof effect.

[0070] In some embodiments, the upper cover body 131 is further provided with a waterproof protrusion 1313, which is disposed around the receiving cavity 1311, and the flange portion 1335 is provided with a waterproof groove 1337 that cooperates with the waterproof protrusion 1313. The cooperation between the waterproof protrusion 1313 and the waterproof groove 1337 can further increase the waterproof performance of the secondary battery.

[0071] In some embodiments, at least a portion of the thickness of the sealing portion 1333 is greater than the gap between the insertion port and the opening, so that the upper cover body 131 applies pre-pressure to the sealing portion 1333. By making at least a portion of the thickness of the sealing portion 1333 greater than the gap between the insertion port and the opening, and thus applying pre-pressure, a better waterproofing effect is achieved.

[0072] In some embodiments, at least a portion of the thickness of the flange 1335 is greater than the gap between the upper cover body 131 and the conductive substrate 4, so that the battery casing applies a pre-compression effect to the flange 1335. By making at least a portion of the thickness of the flange 1335 greater than the gap between the upper cover body 131 and the conductive substrate 4, and thus applying a pre-compression effect, a better waterproof effect is achieved.

[0073] In some embodiments, the upper cover body 131 is provided with at least one vent valve 1314, which connects to the inner cavity of the upper cover body 131 to achieve heat dissipation of the inner cavity. By providing vent valves 1314 in the upper cover body 131, it is possible to facilitate the entry of external air into the inner cavity of the upper cover body 131, thereby facilitating heat dissipation of the inner cavity. It is understood that the number of vent valves 1314 is usually set to two, and they are arranged opposite to each other on the two sides of the upper cover body 131. Preferably, the two vent valves 1314 are arranged opposite to each other on the two farthest sides of the upper cover body 131.

[0074] In some embodiments, the vent valve 1314 may be installed inside other components of the secondary battery (e.g., a mounting bracket) to provide shielding.

[0075] In some embodiments, the upper cover body 131 is provided with heat dissipation fins 1315. Providing heat dissipation fins 1315 to the upper cover body 131 facilitates heat dissipation. Preferably, the extending direction of the heat dissipation fins 1315 is parallel to a predetermined forward direction. By ensuring that the extending direction of the heat dissipation fins 1315 is parallel to the predetermined forward direction, airflow can pass through the heat dissipation fins 1315 during drone flight, which is beneficial for heat dissipation of the secondary battery.

[0076] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A secondary battery, characterized in that, The secondary battery includes: A housing, wherein the housing has a hollowed-out area; The battery body is installed inside the housing. The battery body includes at least one battery cell. The battery cell includes a battery shell. The surface of the battery shell is provided with at least one fin, and the fin corresponds to the hollow area.

2. The secondary battery according to claim 1, characterized in that, The fins are located at the corners of the battery casing; and / or The fins comprise at least two fins, and the interval between any two adjacent fins does not exceed 9 mm.

3. The secondary battery according to claim 1, characterized in that, Along the thickness direction of the battery casing, the sum of the height of the fins and the thickness of the battery casing is not less than 5 mm.

4. The secondary battery according to claim 1, characterized in that, The end face of the fins away from the battery casing is arc-shaped; and / or The fins are continuous.

5. The secondary battery according to claim 1, characterized in that, The number of battery cells is at least two, and there is a gap between adjacent battery cells.

6. The secondary battery according to claim 1, characterized in that, The housing includes a bottom shell, which has a slot that matches the fins.

7. The secondary battery according to claim 6, characterized in that, The housing includes an upper cover, and the hollow area is located between the upper cover and the bottom shell.

8. A drone, characterized in that, The drone includes a secondary battery as described in any one of claims 1 to 7.

9. The UAV according to claim 8, characterized in that, The drone includes a rotor blade, the secondary battery is mounted below the rotor blade, and the extension direction of the blade is parallel to the rotation center axis of the rotor blade.

10. The UAV according to claim 8, characterized in that, The drone has a preset forward direction, and the extension direction of the gap between the battery cells is parallel to the preset forward direction.

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