Lithium metal battery box, battery pack and unmanned aerial vehicle

Abstract

The utility model discloses a lithium metal battery box, a battery pack and an unmanned aerial vehicle. The lithium metal battery box comprises a battery box body and at least one expansion suppression module, the battery box body is internally provided with a containing cavity used for containing a battery cell, and the expansion suppression module is arranged on one side of the containing cavity and at least used for applying pressure to the battery cell located in the containing cavity in a self-adaptive mode. According to the lithium metal battery box provided by the embodiment of the utility model, the expansion suppression module is arranged in the battery box, so that the problem of high expansion rate of the battery module can be better solved, and the problems that the battery box body is easy to deform and crack, the temperature rise of the battery module is too fast, the heat dissipation is not uniform and the like caused by large expansion force and higher heat productivity of the lithium metal battery are solved.

Description

Technical Field

[0001] This utility model specifically relates to a lithium metal battery box, battery pack, and unmanned aerial vehicle, belonging to the field of unmanned aerial vehicle battery equipment technology. Background Technology

[0002] Lightweighting drone batteries has always been a key research area. While achieving weight reduction, it's crucial to ensure balanced heat dissipation within the battery pack to guarantee safety and extend its lifespan. Currently, to achieve lightweight drones, carbon fiber materials are typically used in the fuselage structure and battery pack, along with lithium batteries. Lithium metal batteries, in particular, have a high energy density, making them suitable for drone battery pack manufacturing. However, lithium metal batteries have a high expansion rate, generate significant heat, and experience rapid temperature rise. Ordinary carbon fiber shells struggle to simultaneously achieve lightweighting while maintaining structural strength and ensuring uniform heat dissipation for the internal batteries. Utility Model Content

[0003] The main objective of this invention is to provide a lithium metal battery box, battery pack, and unmanned aerial vehicle, thereby overcoming the shortcomings of the prior art.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:

[0005] A first aspect of this utility model provides a lithium metal battery case, including a battery case body having an internal cavity for accommodating battery cells, and further comprising: at least one expansion suppression module disposed on one side of the accommodating cavity, the expansion suppression module being used at least to adaptively apply pressure to the battery cells located within the accommodating cavity.

[0006] The expansion suppression module includes a telescopic bracket and an elastic traction mechanism. The telescopic bracket includes a first bracket, a second bracket, and a third bracket arranged sequentially along a first direction. The first bracket and the third bracket are arranged on the same side of the second bracket along a second direction and at an angle to the second bracket. The second bracket is also rotatably connected to the first bracket and the third bracket respectively. The elastic traction mechanism is connected to the first bracket and the third bracket respectively. A guide rail extending along the first direction is provided on the inner wall of the accommodating cavity. The first bracket and the third bracket are movably connected to the battery box and can move along the guide rail. When the first bracket and the third bracket move along the guide rail, the second bracket moves synchronously along the second direction, so that the telescopic bracket as a whole exhibits telescopic movement along the second direction. The external force driving the first bracket and the third bracket to move along the guide rail includes the resultant force of the elastic restoring force provided by the elastic traction mechanism and the pressure generated when the second bracket contacts the battery cell. The first direction and the second direction intersect.

[0007] Furthermore, the guide rail includes a guide groove extending along the first direction, and the first bracket and the third bracket are partially embedded in the guide groove and cooperate with the guide groove in a sliding manner.

[0008] Furthermore, the guide rail includes two parallel guide grooves, which are spaced apart along a third direction. The upper and lower ends of the first bracket and the third bracket are respectively embedded in a guide groove, and the third direction intersects with the first direction and the second direction.

[0009] Furthermore, the third direction, the first direction, and the second direction are orthogonal.

[0010] Furthermore, the third direction is the height direction of the battery box, and one of the first direction and the second direction is the length direction of the battery box, and the other is the width direction.

[0011] In a more specific implementation, a rotating shaft is fixedly mounted on the first bracket and the third bracket. The two ends of the rotating shaft are disposed in the guide groove and slide in the guide groove. Rollers are also mounted on the rotating shaft and rotate in cooperation with the rotating shaft. The inner wall of the accommodating cavity is also provided with an uneven textured structure. The textured structure extends along the first direction as a whole. The rollers are in frictional contact with the textured structure and can roll along the textured structure.

[0012] Furthermore, the rotating shaft is also provided with two or more rollers, which are spaced apart along the axial direction of the rotating shaft.

[0013] Furthermore, the surface of the roller has a rough structure.

[0014] Furthermore, the texture structure is disposed between the two guide grooves.

[0015] In a more specific implementation, a positioning groove is provided on the inner wall of the accommodating cavity, the guide rail is located on the side wall of the positioning groove, and the textured structure is provided at the bottom of the positioning groove.

[0016] Furthermore, the texture structure includes a plurality of raised strips, which are arranged sequentially along the first direction, and each raised strip extends along a third direction.

[0017] Furthermore, the second bracket, the first bracket, and the third bracket always maintain an obtuse angle between them.

[0018] Furthermore, the second bracket is pivotally connected to the first bracket and the third bracket.

[0019] Furthermore, the elastic tensioning mechanism is detachably connected to the first support and the third support.

[0020] Furthermore, the elastic tensioning mechanism is connected to the first bracket and the third bracket via a hook and latch structure.

[0021] Furthermore, the elastic tension mechanism includes at least one spring.

[0022] In a more specific implementation, the expansion suppression module further includes a force equalizing plate located on the side of the second support facing the center region of the accommodating cavity. The force equalizing plate is fixedly connected to the second support and directly contacts the battery cell located in the accommodating cavity. The force equalizing plate is movably coordinated with the battery box and can move synchronously with the second support.

[0023] In a more specific implementation, the expansion suppression module further includes a plurality of elastically retractable support mechanisms, which are fixed to the side of the force equalizing plate opposite to the central region of the accommodating cavity, and the support mechanisms also maintain constant contact with the inner wall of the accommodating cavity.

[0024] Furthermore, the support mechanism includes multiple telescopic joints arranged along its own axial direction, adjacent telescopic joints being elastically engaged, and each telescopic joint is also provided with a buckle structure that can elastically extend and retract along its own radial direction, the buckle structure protruding from the telescopic movement trajectory of the telescopic joint along its own axial direction.

[0025] In a more specific implementation, each of the accommodating cavities is provided with two expansion suppression modules, and the two expansion suppression modules are arranged opposite each other along the first direction or the second direction.

[0026] Furthermore, the battery housing is provided with multiple accommodating cavities.

[0027] Furthermore, the battery box includes a battery box body, a partition structure, and a battery box cover. The partition structure is disposed inside the battery box body and divides the battery box body to form a plurality of accommodating cavities. The battery box cover is openably disposed on the battery box body.

[0028] Furthermore, the outer shell of the battery box body is a carbon fiber sandwich graphene composite structure, and the separator structure is a carbon fiber sandwich graphene-PCM composite separator structure.

[0029] A second aspect of this utility model provides a battery pack comprising a plurality of battery cells and the lithium metal battery case, wherein the plurality of battery cells are encapsulated in the accommodating cavity of the lithium metal battery case.

[0030] It should be noted that other structures of the battery pack are all known in the art and are not considered improvements to this utility model, and therefore are not limited thereto.

[0031] A second aspect of this utility model provides an unmanned aerial vehicle (UAV) whose power source includes the aforementioned battery pack.

[0032] It should be noted that other structures of the unmanned aerial vehicle can be known in the art and are not considered improvements to this utility model, and therefore are not limited thereto.

[0033] Compared with the prior art, the advantages of this utility model include: the lithium metal battery box provided by the embodiment of this utility model has an expansion suppression module set inside the battery box, which can better deal with the problem of high battery module expansion rate, and solve the problems of easy deformation and cracking of battery box body and excessively fast temperature rise and uneven heat dissipation of battery module caused by the large expansion force and high heat generation of lithium metal battery.

[0034] This utility model provides a lithium metal battery box. The main body of the battery box is a carbon fiber sandwich graphene composite structure, which has the function of heat dissipation and cooling for the lithium metal battery module inside the box, thus achieving the weight reduction of the box. The internal partition structure of the box adopts a carbon fiber sandwich graphene-PCM composite structure, which makes the heat dissipation effect of the internal lithium metal battery pack better, and at the same time improves the weight reduction of the box. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the main parts of a lithium metal battery box provided in a typical embodiment of this utility model;

[0037] Figure 2 This is a schematic diagram of the expansion suppression module provided in a typical embodiment of this utility model;

[0038] Figure 3 This is a partial structural schematic diagram of the expansion suppression module provided in a typical embodiment of this utility model;

[0039] Figure 4 This is a partial structural schematic diagram of the expansion suppression module provided in a typical embodiment of this utility model. Detailed Implementation

[0040] In view of the shortcomings of the prior art, the inventors of this case, through long-term research and extensive practice, have proposed the technical solution of this utility model. The following will further explain and illustrate the technical solution, its implementation process, and its principles in conjunction with the accompanying drawings and specific implementation examples.

[0041] For a more specific implementation plan, please refer to Figure 1 A lithium metal battery box includes a battery box body and multiple expansion suppression modules. The battery box body includes a battery box main body 22, a partition structure 1, and a battery box cover. The partition structure 1 is disposed inside the battery box main body 22 and divides the battery box main body 22 to form multiple accommodating cavities 5. The accommodating cavities 5 are used to accommodate battery cells. The battery box cover is openably disposed on the battery box main body 22. Each accommodating cavity 5 is provided with at least one expansion suppression module. The expansion suppression module is disposed on one side of the accommodating cavity 5 and is used to adaptively apply pressure to the battery cells located in the accommodating cavity 5 to cope with the expansion of the lithium metal battery / cell / battery module.

[0042] It should be noted that, as follows, the width direction of the lithium metal battery box is defined as the first direction, the length direction as the second direction, and the height direction as the third direction.

[0043] Specifically, the partition structure 1 includes multiple partitions, which are vertically and intersectingly fixed inside the battery box body 22, and together with the battery box body 22, they enclose multiple accommodating cavities 5. It can be understood that each accommodating cavity 5 is formed by the partitions and the battery box body 22; therefore, the inner wall of the accommodating cavity 5 includes the surfaces of the battery box body 22 and the partitions. Specifically, to enhance the structural strength of the battery box and facilitate the arrangement of the heat dissipation structure, the multiple partitions are preferably distributed perpendicularly to each other. More specifically, one of the multiple partitions extends along a second direction, while the remaining partitions extend along a first direction and are spaced apart along the second direction. Figure 1 The diagram shows a scheme in which the three intersecting partitions form a partition structure 1 that, together with the battery box body, encloses six accommodating cavities 5. It should be noted that the partitions can be fixed to the battery box body using known fixing structures / methods in the art, such as adhesive bonding, and are not limited here.

[0044] More specifically, to ensure the structural strength of the connection between the partition and the battery box body, a reinforcing rib structure 2 can be provided at the connection between the partition and the battery box body. The specific structure and dimensions of the reinforcing rib structure 2 can be set according to specific needs and are not limited here. Specifically, to facilitate the exit of power lines and low-voltage harnesses from inside the box, a high-voltage and low-voltage harness outlet 3 can also be provided on one side of the battery box body. These are conventional designs known to those skilled in the art and are not specifically limited here.

[0045] Specifically, the main body of the battery box can be assembled from carbon fiber sandwich graphene composite panels, and the partitions can be carbon fiber sandwich graphene-PCM composite panels. Both of these carbon fiber composite materials have lower densities than sheet metal, ensuring the battery box's lightweight design. Simultaneously, the structure of the carbon fiber sandwich graphene composite panels allows heat conduction through the graphene material layer around the battery modules / cells inside the housing 5, transferring heat from the inside of the box to the outside for dissipation, thus improving the battery box's heat dissipation effect. Furthermore, the structure of the carbon fiber sandwich graphene-PCM composite panels allows heat between the internal battery modules / cells to be transferred through the graphene-PCM composite panels of the side partitions to the bottom graphene material layer, and then dissipated through the bottom graphene material layer. These heat dissipation structures ensure uniform heat dissipation for the battery modules / cells inside the battery box, preventing excessive temperature rise and ensuring safety while extending the battery module's cycle life. It should be noted that both carbon fiber sandwich graphene composite panels and carbon fiber sandwich graphene-PCM composite panels can be obtained using processes known in the art, and their specific structural parameters are not limited here.

[0046] Please refer to the following for details. Figure 1 , Figure 2The expansion suppression module includes a telescopic bracket 8 and an elastic pulling mechanism 10. The telescopic bracket 8 includes a first bracket, a second bracket 13, and a third bracket arranged sequentially along a first direction. The first and third brackets are arranged on the same side of the second bracket 13 along a second direction and are angled to the second bracket 13. The second bracket 13 is also rotatably connected to the first and third brackets respectively. The elastic pulling mechanism 10 is connected to the first and third brackets respectively. Furthermore, a guide rail 21 extending along the first direction is provided on the inner wall of the accommodating cavity 5. The first and third brackets are movably connected to the battery box and can move along the guide rail 21. When the first and third brackets move along the guide rail 21, the second bracket 13 moves synchronously along the second direction, thus expanding the telescopic bracket. The support 8 exhibits an overall telescopic behavior along the second direction. The external force driving the first and third supports to move along the guide rail 21 includes the elastic restoring force provided by the elastic tension mechanism 10 and the combined force of the pressure generated when the second support 13 contacts the battery cell. That is, when the telescopic support 8 contacts the battery cell in the accommodating cavity 5, and the battery cell expands, increasing the contact pressure between the battery cell and the telescopic support 8, the telescopic support 8 can move or tend to move along the guide rail 21, resulting in an elongation tendency. At this time, the elastic restoring force of the elastic tension mechanism 10 between the first and third supports can prevent the telescopic support 8 from moving along the guide rail 21, so that the telescopic support 8 is tightly pressed against the battery cell along the first direction, thereby inhibiting the expansion of the battery cell.

[0047] Specifically, the second support 13 maintains an obtuse angle with the first and third supports, meaning the first and third supports are tilted outwards from the second support 13. More specifically, the second support 13 is pivotally connected to the first and third supports, meaning they can be rotatably connected via a shaft 1212. It should be noted that a limiting structure can be provided between the second support 13 and the first and third supports to restrict their relative rotation angle. Such a limiting structure can employ various known structures in the art, and no specific limitation is made here. Furthermore, the specific structure of the second support 13 and the first and third supports is not specifically limited here.

[0048] Please refer to the following for details. Figure 1 , Figure 2 and Figure 4The guide rail 21 includes two guide grooves extending along a first direction. The two guide grooves are spaced apart and arranged in parallel along a third direction. The upper and lower ends of the first and third brackets are partially embedded in the guide grooves and cooperate with the guide grooves by sliding. More specifically, the tail ends of the first and third brackets opposite to the second bracket 13 are fixedly provided with rotating shafts 6. The upper and lower ends of the rotating shafts 6 are arranged in the guide grooves and cooperate with the guide grooves by sliding, thereby realizing the connection between the telescopic bracket 8 and the battery box, and at the same time realizing the restriction and guidance of the telescopic movement of the telescopic bracket 8.

[0049] For more details, please refer to the following: Figure 1 , Figure 2 and Figure 4 The rotating shaft 6 is also equipped with rollers 7. The rollers 7 and the rotating shaft 6 are fixed in the axial direction of the rotating shaft 6, but they rotate together. The inner wall of the accommodating cavity 5 is also provided with an uneven textured structure 4. The textured structure 4 extends along the first direction and is arranged between two guide grooves in the third direction. The rollers 7 are in frictional contact with the textured structure 4 and can roll along the textured structure 4. Specifically, through the rotation of the connection between the structures, when the battery module / cell expands, the elastic pulling mechanism 10 can push the rotating shaft 6 at the end of the telescopic bracket 8 to slide. At the same time, the rollers 7 are also subjected to the pressure of the textured structure 4, which has a certain resistance to the expansion force. Specifically, each rotating shaft 6 is also provided with two or more rollers 7, which are spaced apart along the axial direction of the rotating shaft 6. The surface of the rollers 7 is a rough structure.

[0050] More specifically, a positioning groove is provided on the inner wall of the accommodating cavity 5, the guide rail 21 is located on the side wall of the positioning groove, and the texture structure 4 is provided at the bottom of the positioning groove. The texture structure 4 includes multiple convex strips, which are arranged sequentially along a first direction, and each convex strip extends along a third direction. It can be understood that the aforementioned guide groove, positioning groove, texture structure 4, etc. are all provided on the battery box body or partition.

[0051] Specifically, the elastic tension mechanism 10 is detachably connected to the first and third supports. For example, the elastic tension mechanism 10 is connected to the first and third supports via a hook and latch structure. For instance, the first and third supports are provided with latches 9, and the elastic tension mechanism 10 is provided with hooks 11. The connection between the two is achieved by the hooks engaging the latches. More specifically, the elastic tension mechanism 10 includes at least one spring. The figure shows a scheme where each elastic tension mechanism 10 includes two springs arranged in parallel. The dimensions and other parameters of the springs are not limited.

[0052] Please refer to a more detailed implementation plan as well. Figure 1 , Figure 3 and Figure 4To improve the uniformity of the expansion suppression module's suppression effect on the battery cells within the accommodating cavity 5, the expansion suppression module also includes a force equalizing plate 14. The area of ​​the force equalizing plate 14 is close to the area of ​​the side of the battery cell it faces. The force equalizing plate 14 is located on the side of the second support 13 facing the central area of ​​the accommodating cavity 5. The force equalizing plate 14 is fixedly connected to the second support 13 and is in direct contact with the battery cell located in the accommodating cavity 5. The force equalizing plate 14 is movable and can move synchronously with the battery box body. By increasing the contact area between the expansion suppression module and the battery cell, the force is applied evenly, thereby achieving the dispersion and balance of external forces and avoiding damage to the battery cell.

[0053] Please refer again to a more detailed implementation plan. Figure 1 , Figure 3 and Figure 4 To further improve the constraint effect of the expansion suppression module on cell expansion, the expansion suppression module also includes multiple elastically retractable support mechanisms 16. The support mechanisms 16 are fixed to the side of the force equalizing plate 14 facing away from the central region of the accommodating cavity 5, and the support mechanisms 16 maintain constant contact with the inner wall of the accommodating cavity 5. For example, Figure 3 In the scheme shown, the expansion suppression module includes four support mechanisms 16, which are respectively disposed at the four corners of the uniform force plate 14. Specifically, each support mechanism 16 includes multiple telescopic joints arranged along its own axial direction, with adjacent telescopic joints elastically engaged. Each telescopic joint also has a snap-fit ​​structure that can elastically extend and retract in its own radial direction. The snap-fit ​​structure protrudes from the telescopic joint's axial extension and retraction trajectory. When the force on the telescopic joint in its own axial direction exceeds a predetermined value, the snap-fit ​​structure is compressed, causing the telescopic joint to elastically extend and retract in its radial direction, thus causing the support mechanism 16 to contract as a whole. It should be noted that the structure of this elastically extendable support mechanism 16 is known in the art and can be obtained commercially; therefore, its specific structure and dimensions are not subject to excessive restrictions here.

[0054] Please refer again to a more detailed implementation plan. Figure 1 Each accommodating cavity 5 is provided with two expansion suppression modules, which are arranged opposite to each other along the first direction. Preferably, the multiple accommodating cavities 5 are the same size, and similarly, the multiple expansion suppression modules are also the same in structure and size.

[0055] In addition, the battery pack formed by the battery box and the battery cell may also include components known in the art, such as a battery management system, temperature sensor, and insulation structure. However, these are known in the art and are not considered as improvements to this utility model. Therefore, they will not be explained or described in detail.

[0056] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A lithium metal battery case, comprising a battery case body, wherein the battery case body has an internal cavity for accommodating battery cells, characterized in that, Also includes: At least one expansion suppression module is disposed on one side of the accommodating cavity and is used to adaptively apply pressure to the battery cell located within the accommodating cavity. The expansion suppression module includes a telescopic bracket and an elastic traction mechanism. The telescopic bracket includes a first bracket, a second bracket, and a third bracket arranged sequentially along a first direction. The first bracket and the third bracket are arranged on the same side of the second bracket along a second direction and at an angle to the second bracket. The second bracket is also rotatably connected to the first bracket and the third bracket respectively. The elastic traction mechanism is connected to the first bracket and the third bracket respectively. A guide rail extending along the first direction is provided on the inner wall of the accommodating cavity. The first bracket and the third bracket are movably connected to the battery box and can move along the guide rail. When the first bracket and the third bracket move along the guide rail, the second bracket moves synchronously along the second direction, so that the telescopic bracket as a whole exhibits telescopic movement along the second direction. The external force driving the first bracket and the third bracket to move along the guide rail includes the resultant force of the elastic restoring force provided by the elastic traction mechanism and the pressure generated when the second bracket contacts the battery cell. The first direction and the second direction intersect.

2. The lithium metal battery case according to claim 1, characterized in that: The guide rail includes a guide groove extending along the first direction, and the first bracket and the third bracket are partially embedded in the guide groove and cooperate with the guide groove by sliding.

3. The lithium metal battery case according to claim 2, characterized in that: The guide rail includes two parallel guide grooves, which are spaced apart along a third direction. The upper and lower ends of the first bracket and the third bracket are respectively embedded in a guide groove. The third direction intersects with the first direction and the second direction.

4. The lithium metal battery case according to claim 3, characterized in that: The third direction, the first direction, and the second direction are orthogonal.

5. The lithium metal battery case according to claim 4, characterized in that: The third direction is the height direction of the battery box, and one of the first direction and the second direction is the length direction of the battery box, and the other is the width direction.

6. The lithium metal battery case according to claim 2, characterized in that: The first bracket and the third bracket are fixedly provided with a rotating shaft. The two ends of the rotating shaft are disposed in the guide groove and slide in the guide groove. The rotating shaft is also provided with a roller. The roller rotates in cooperation with the rotating shaft. The inner wall of the accommodating cavity is also provided with an uneven textured structure. The textured structure extends along the first direction. The roller rubs against the textured structure and can roll along the textured structure.

7. The lithium metal battery case according to claim 6, characterized in that: The rotating shaft is also provided with two or more rollers, which are spaced apart along the axial direction of the rotating shaft.

8. The lithium metal battery case according to claim 6 or 7, characterized in that: The surface of the roller has a rough structure.

9. The lithium metal battery case according to claim 6, characterized in that: The texture structure is disposed between the two guide grooves.

10. The lithium metal battery case according to claim 6, characterized in that: A positioning groove is provided on the inner wall of the accommodating cavity, the guide rail is located on the side wall of the positioning groove, and the textured structure is provided at the bottom of the positioning groove.

11. The lithium metal battery case according to claim 10, characterized in that: The texture structure includes multiple raised strips, which are arranged sequentially along the first direction, and each raised strip extends along a third direction.

12. The lithium metal battery case according to claim 1, characterized in that: The second bracket, the first bracket, and the third bracket always maintain an obtuse angle between them.

13. The lithium metal battery case according to claim 12, characterized in that: The second bracket is pivotally connected to the first bracket and the third bracket.

14. The lithium metal battery case according to claim 12, characterized in that: The elastic traction mechanism is detachably connected to the first support and the third support.

15. The lithium metal battery case according to claim 14, characterized in that: The elastic traction mechanism is connected to the first bracket and the third bracket via a hook and latch structure.

16. The lithium metal battery case according to claim 12, characterized in that: The elastic tensioning mechanism includes at least one spring.

17. The lithium metal battery case according to claim 1 or 12, characterized in that: The expansion suppression module also includes a force equalizing plate, which is located on the side of the second bracket facing the center region of the accommodating cavity. The force equalizing plate is fixedly connected to the second bracket and directly contacts the battery cell located in the accommodating cavity. The force equalizing plate is movable and cooperates with the battery box and can move synchronously with the second bracket.

18. The lithium metal battery case according to claim 17, characterized in that: The expansion suppression module also includes multiple elastically retractable support mechanisms, which are fixed to the side of the force equalizing plate opposite to the center region of the accommodating cavity, and the support mechanisms also maintain constant contact with the inner wall of the accommodating cavity.

19. The lithium metal battery case according to claim 18, characterized in that: The support mechanism includes multiple telescopic joints arranged along its own axial direction, adjacent telescopic joints being elastically engaged, and each telescopic joint is also provided with a buckle structure that can elastically extend and retract along its own radial direction, the buckle structure protruding from the telescopic movement trajectory of the telescopic joint along its own axial direction.

20. The lithium metal battery case according to claim 1, characterized in that: Each of the accommodating cavities is provided with two expansion suppression modules, which are arranged opposite to each other along the first direction or the second direction.

21. The lithium metal battery case according to claim 20, characterized in that: The battery housing has multiple accommodating cavities inside.

22. The lithium metal battery case according to claim 20, characterized in that: The battery box includes a battery box body, a partition structure, and a battery box cover. The partition structure is disposed inside the battery box body and divides the battery box body to form a plurality of accommodating cavities. The battery box cover is openably disposed on the battery box body.

23. The lithium metal battery case according to claim 22, characterized in that: The outer shell of the battery box is a carbon fiber sandwich graphene composite structure, and the separator structure is a carbon fiber sandwich graphene-PCM composite separator structure.

24. A battery pack, characterized in that, include: A plurality of battery cells and a lithium metal battery case as described in any one of claims 1-23, wherein the plurality of battery cells are encapsulated in the accommodating cavity of the lithium metal battery case.

25. An unmanned aerial vehicle, characterized in that, The power source for the unmanned aerial vehicle includes the battery pack as described in claim 24.

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