Battery module tab flattening tool

Abstract

The embodiment of the utility model provides a battery module tab flattening tool, and relates to the technical field of batteries. The battery module tab flattening tool comprises a tool frame, a flattening structure and a driving device, the flattening structure is movably connected to the tool frame, the flattening structure is provided with a plurality of flattening protrusions, and the flattening protrusions are used for being in one-to-one correspondence with a plurality of tabs of a battery module; the driving device is arranged on the tool frame, is connected with the flattening structure and is used for driving the flattening structure to move relative to the tool frame so as to flatten the plurality of tabs. According to the battery module tab flattening tool, the flattening workload can be reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module tab flattening tool. Background Art

[0002] Currently, the processing process for the welding points of battery modules involves manual prying and inspection of the tabs, which causes the tabs to be tilted upward after being pried, thus adversely affecting the overall appearance. In subsequent processes, each pry-inspected welding point needs to be manually processed again to restore it to a flat state.

[0003] However, due to the large number of tabs to be pried and inspected, the corresponding flattening workload also increases, which in turn significantly increases the time and energy invested by the workers, thus resulting in low work efficiency. Utility Model Content

[0004] The utility model aims to provide a battery module tab flattening tool, which can reduce the flattening workload and improve work efficiency.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a battery module tab flattening tool, comprising:

[0007] Tooling rack;

[0008] A flattening structure, wherein the flattening structure is movably connected to the tooling frame and is provided with a plurality of flattening protrusions, wherein the plurality of flattening protrusions are used to correspond one by one to a plurality of tabs of a battery module; and

[0009] A driving device is disposed on the tooling frame and connected to the flattening structure, and is used for driving the flattening structure to move relative to the tooling frame so as to flatten the plurality of tabs.

[0010] In an optional embodiment, the flattening structure includes a guide rod and a flat plate, wherein the guide rod is movably connected to the tooling frame; the flat plate is connected to the guide rod, and the plurality of flattening protrusions are provided on a side of the flattening plate away from the guide rod, and the driving device is connected to the flat plate.

[0011] In an optional embodiment, the number of the guide rods is two, the two guide rods are arranged at an interval, and the driving device is located between the two guide rods.

[0012] In an alternative embodiment, the driving device includes a motor and a lifting mechanism. Both the motor and the lifting mechanism are disposed on the tooling rack. The motor is in transmission connection with the lifting mechanism, and the lifting mechanism is connected to the flattening structure.

[0013] In an alternative embodiment, the lifting mechanism includes a driving gear, a driven gear, and a lifting rod. The driving gear is in transmission connection with the motor and meshes with the driven gear.

[0014] The driven gear is rotatably disposed on the tooling rack and sleeved on the lifting rod. The lifting rod passes through the tooling rack and the driven gear simultaneously, and the lifting rod is in threaded connection with the driven gear. The flattening structure is connected to the lifting rod.

[0015] In an alternative embodiment, the tooling rack is provided with a limiting protrusion. The limiting protrusion is provided with a rotating groove, and the side wall of the rotating groove is provided with an annular limiting groove. The driven gear includes a gear portion, a rotating portion, and an annular limiting portion connected in sequence. The gear portion meshes with the driving gear. The rotating portion is disposed in the rotating groove, and the annular limiting portion is rotatably clamped in the annular limiting groove.

[0016] The lifting rod passes through the rotating groove, the annular limiting portion, the rotating portion, and the gear portion simultaneously, and the lifting rod is in threaded connection with the annular limiting portion, the rotating portion, and the gear portion simultaneously.

[0017] In an alternative embodiment, the tooling rack includes a fixing plate, a first side plate, and a second side plate. The first side plate and the second side plate are spaced apart. The fixing plate is disposed between the first side plate and the second side plate and is connected to the first side plate and the second side plate simultaneously.

[0018] The flattening structure is movably connected to the fixing plate. The driving device is disposed on the fixing plate, and both the flattening structure and the driving device are located between the first side plate and the second side plate.

[0019] In an alternative embodiment, the battery module tab flattening tooling further includes a mounting rack. The mounting rack is disposed between the first side plate and the second side plate and is located on the side of the flattening structure away from the fixing plate. The mounting rack is used for mounting the battery module, and the plurality of flattening protrusions are disposed on the side of the flattening structure close to the mounting rack.

[0020] In an alternative embodiment, the mounting rack is provided with a guiding groove.

[0021] In an alternative embodiment, the tooling rack further includes a protection plate which is spaced apart from the fixed plate and located on a side of the fixed plate away from the flattening structure. The protection plate is connected to both the first side plate and the second side plate, and the driving device is located between the protection plate and the fixed plate.

[0022] The beneficial effects of the embodiments of the present utility model include:

[0023] The battery module tab flattening tooling includes a tooling rack, a flattening structure, and a driving device. The flattening structure is movably connected to the tooling rack, and the flattening structure is provided with a plurality of flattening protrusions, and the plurality of flattening protrusions are used to correspond to a plurality of tabs of the battery module one by one; the driving device is arranged on the tooling rack and is connected to the flattening structure for driving the flattening structure to move relative to the tooling rack to flatten the plurality of tabs. That is to say, by setting the driving device to drive the flattening structure to flatten the tabs, automatic tab flattening can be realized, reducing the time and workload invested in manual tab flattening; and by providing a plurality of flattening protrusions on the flattening structure, a plurality of tabs on the battery module can be flattened simultaneously, thereby significantly improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the battery module tab flattening tooling provided by the embodiment of the present utility model;

[0026] Figure 2 It is a schematic flattening diagram of the battery module tab flattening tooling and the battery module provided by the embodiment of the present utility model;

[0027] Figure 3 It is a schematic diagram of the flattening structure provided by the embodiment of the present utility model;

[0028] Figure 4 It is a partial structural schematic diagram of the battery module tab flattening tooling from the first perspective provided by the embodiment of the present utility model;

[0029] Figure 5 It is a partial structural schematic diagram of the battery module tab flattening tooling from the second perspective provided by the embodiment of the present utility model;

[0030] Figure 6Structural schematic diagram of the driven gear provided by the embodiment of the present utility model;

[0031] Figure 7 Structural schematic diagram of the limiting protrusion provided by the embodiment of the present utility model.

[0032] Icon: 100 - Battery module tab flattening tooling; 10 - Tooling frame; 11 - Fixed plate; 12 - First side plate; 13 - Second side plate; 14 - Protection plate; 15 - Limiting protrusion; 151 - Rotating groove; 152 - Annular limiting groove; 20 - Flattening structure; 21 - Flattening protrusion; 22 - Guide rod; 23 - Flattening plate; 30 - Driving device; 31 - Motor; 32 - Lifting mechanism; 321 - Driving gear; 322 - Driven gear; 3221 - Gear part; 3222 - Rotating part; 3223 - Annular limiting part; 323 - Lifting rod; 40 - Mounting frame; 41 - Guide groove; 200 - Battery module. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] As described in the background technology, currently, the processing flow for the welding points of battery modules involves manual prying and inspection of the tabs, which causes the tabs to be tilted upward after being pried and inspected. In the subsequent process, each pried and inspected welding point needs to be manually processed again to restore it to a flat state. However, due to the large number of pried and inspected tabs, the corresponding flattening workload also increases, which significantly increases the time and energy invested by the manual labor, resulting in low work efficiency.

[0040] Based on this, please refer to Figures 1-7 The embodiment of the utility model provides a battery module tab flattening tool 100, which can effectively improve the above-mentioned technical problems, that is, it can reduce the flattening workload and improve work efficiency. The battery module tab flattening tool 100 will be described in detail below.

[0041] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the battery module tab flattening tool 100 provided in this embodiment. Figure 2Schematic diagram of flattening the tabs of the battery module provided in this embodiment by the tab flattening tooling 100 of the battery module 200. Combining Figure 1 and Figure 2 , the tab flattening tooling 100 of the battery module includes a tooling frame 10, a flattening structure 20, and a driving device 30. The flattening structure 20 is movably connected to the tooling frame 10, and the flattening structure 20 is provided with a plurality of flattening protrusions 21, and the plurality of flattening protrusions 21 are used to correspond to a plurality of tabs (not shown in the figure) of the battery module 200 one by one; the driving device 30 is arranged on the tooling frame 10, and the driving device 30 is connected to the flattening structure 20, and is used to drive the flattening structure 20 to move relative to the tooling frame 10 to flatten a plurality of tabs.

[0042] That is to say, by setting the driving device 30 to drive the flattening structure 20 to flatten the tabs, automatic tab flattening can be realized, reducing the time and workload invested in manual tab flattening; and, by arranging a plurality of flattening protrusions 21 on the flattening structure 20, a plurality of tabs on the battery module 200 can be flattened simultaneously, thus significantly improving the work efficiency.

[0043] It should be noted that, in order to improve the moving accuracy of the flattening structure 20 and the flattening precision, in some embodiments, devices such as distance sensors can also be arranged on the tooling frame 10 to locate the specific positions of the tabs and control the moving distance of the flattening structure 20, etc.

[0044] Specifically, please refer to Figure 3 , Figure 3 Schematic diagram of the flattening structure 20 provided in this embodiment. Combining Figures 1-3 , the flattening structure 20 includes a guide rod 22 and a flattening plate 23. The guide rod 22 is movably connected to the tooling frame 10; the flattening plate 23 is connected to the guide rod 22, and a plurality of flattening protrusions 21 are arranged on the side of the flattening plate 23 away from the guide rod 22, and the driving device 30 is connected to the flattening plate 23. By arranging the guide rod 22, a guiding effect can be provided for the movement of the flattening plate 23, making the process of the driving device 30 driving the flattening plate 23 relatively stable, thereby improving the flattening stability of the tabs.

[0045] In order to further improve the moving stability of the flattening plate 23 and improve the surface flatness of the tabs after being flattened, in this embodiment, the number of the guide rods 22 is two, the two guide rods 22 are arranged at intervals, and the driving device 30 is located between the two guide rods 22.

[0046] Of course, in other embodiments, the number of the guide rods 22 can also be three, four, five, etc.; the specific number needs to be determined according to the actual design requirements of the tab flattening tooling.

[0047] It should be noted that, in the present embodiment, the plurality of flattened protrusions 21 are arranged in a rectangular array; of course, in other embodiments, the plurality of flattened protrusions 21 may also be arranged in a circular array or other arrangements. The specific arrangement needs to be determined based on the actual arrangement of the tabs of the battery module 200 and the position of the tab to be inspected.

[0048] For further information, please refer to Figure 4 and Figure 5 , Figure 4 This is a partial structural schematic diagram of the battery module tab flattening tool 100 provided in this embodiment from a first perspective, Figure 5 A partial structural diagram of the second perspective of the battery module tab flattening tool 100 provided in this embodiment, combined with Figure 4 and Figure 5 The driving device 30 includes a motor 31 and a lifting mechanism 32, both of which are arranged on the tooling frame 10, and the motor 31 is connected to the lifting mechanism 32 in a transmission manner, and the lifting mechanism 32 is connected to the flattening structure 20; specifically, in this embodiment, the lifting mechanism 32 is connected to the flattening plate 23. It is easy to understand that the motor 31 drives the lifting mechanism 32 to move, thereby driving the flattening plate 23 connected to the lifting mechanism 32 to move, so as to realize the flattening operation of the tab.

[0049] Specifically, in this embodiment, the lifting mechanism 32 includes a driving gear 321, a driven gear 322 and a lifting rod 323. The driving gear 321 is transmission-connected to the motor 31 and meshes with the driven gear 322; the driven gear 322 is rotatably disposed on the tooling frame 10 and is sleeved on the lifting rod 323; the lifting rod 323 is simultaneously penetrated through the tooling frame 10 and the driven gear 322, and the lifting rod 323 is threadedly connected to the driven gear 322, and the flattening structure 20 is connected to the lifting rod 323.

[0050] That is, the motor 31 can drive the driving gear 321 to rotate, the driving gear 321 drives the driven gear 322 to rotate, and the driven gear 322 drives the lifting rod 323 to rotate accordingly, and the lifting rod 323 is moved relative to the tooling frame 10 by the threaded connection between the lifting rod 323 and the driven gear 322, and because the driven gear 322 is fixed on the tooling frame 10 and rotates, it does not move up and down accordingly. It is easy to understand that the motor 31 can realize the rising or falling movement of the lifting rod 323 by forward or reverse rotation, thereby driving the pounding plate 23 to move up and down.

[0051] Further, in order to facilitate the limiting of the driven gear 322 and realize its rotation following the driving gear 321, the tooling frame 10 is provided with a limiting protrusion 15. For details, please refer to Figure 6 and Figure 7 , Figure 6Schematic diagram of the driven gear 322 provided in this embodiment Figure 7 Schematic diagram of the limiting protrusion 15 provided in this embodiment. In combination with Figures 4-7 , a rotating groove 151 is formed in the limiting protrusion 15, and an annular limiting groove 152 is formed in the side wall of the rotating groove 151; the driven gear 322 includes a gear portion 3221, a rotating portion 3222, and an annular limiting portion 3223 that are sequentially connected. The gear portion 3221 meshes with the driving gear 321. The rotating portion 3222 is disposed in the rotating groove 151, and the annular limiting portion 3223 is rotatably clamped in the annular limiting groove 152; the lifting rod 323 passes through the rotating groove 151, the annular limiting portion 3223, the rotating portion 3222, and the gear portion 3221 at the same time, and the lifting rod 323 is threadedly connected to the annular limiting portion 3223, the rotating portion 3222, and the gear portion 3221 at the same time.

[0052] It can be understood that by providing the annular limiting groove 152 to clamp and limit the annular limiting portion 3223 of the driven gear 322, the driven gear 322 only rotates on the tooling rack 10. Thus, under the action of the threaded connection between the lifting rod 323 and the driven gear 322, the lifting rod 323 will move up and down through the rotational cooperation of the threads.

[0053] Please combine with Figure 1 , Figure 4 and Figure 5 . In this embodiment, specifically, the tooling rack 10 includes a fixing plate 11, a first side plate 12, and a second side plate 13. The first side plate 12 and the second side plate 13 are spaced apart. The fixing plate 11 is disposed between the first side plate 12 and the second side plate 13 and is connected to the first side plate 12 and the second side plate 13 at the same time; the flattening structure 20 is movably connected to the fixing plate 11, the driving device 30 is disposed on the fixing plate 11, and both the flattening structure 20 and the driving device 30 are located between the first side plate 12 and the second side plate 13.

[0054] Specifically in this implementation, the flattening plate 23 is disposed between the first side plate 12 and the second side plate 13. The guide rod 22 is movably passed through the fixing plate 11, and the motor 31 is disposed on the side of the fixing plate 11 away from the flattening plate 23. Through the arrangement of the first side plate 12 and the second side plate 13, the flattening structure 20 and the driving device 30 can be protected to a certain extent. By disposing the motor 31 on the side of the fixing plate 11 away from the flattening plate 23, the driving process and the flattening process of the motor 31 will not affect each other.

[0055] Furthermore, in order to protect the driving device 30 and improve the overall structural strength of the tooling rack 10, in this embodiment, the tooling rack 10 further includes a protection plate 14. The protection plate 14 is spaced from the fixing plate 11 and is located on the side of the fixing plate 11 away from the flattening structure 20. The protection plate 14 is connected to both the first side plate 12 and the second side plate 13 at the same time, and the driving device 30 is located between the protection plate 14 and the fixing plate 11.

[0056] Before flattening the tabs on the battery module 200, in order to facilitate the installation of the battery module 200, in this embodiment, the battery module tab flattening tooling 100 further includes a mounting rack 40. The mounting rack 40 is arranged between the first side plate 12 and the second side plate 13 and is located on the side of the flattening structure 20 away from the fixing plate 11; the mounting rack 40 is used for mounting the battery module 200, and a plurality of flattening protrusions 21 are arranged on the side of the flattening structure 20 close to the mounting rack 40.

[0057] It can be understood that when the battery module 200 is placed conventionally, the mounting rack 40 is located below the flattening plate 23. Through the supporting effect of the mounting rack 40, the stability during the flattening process can be improved.

[0058] In order to further facilitate the installation of the battery module 200, in this embodiment, the mounting rack 40 is provided with a guiding groove 41. The guiding groove 41 can be in guiding cooperation with the guiding portion at the bottom of the battery module 200, which is more convenient for the battery module 200 to be assembled onto the mounting rack 40 and can also facilitate the removal from the mounting rack 40.

[0059] In summary, the embodiment of the present invention provides a battery module tab flattening tooling 100. The battery module tab flattening tooling 100 includes a tooling rack 10, a flattening structure 20, and a driving device 30. The flattening structure 20 is movably connected to the tooling rack 10, and the flattening structure 20 is provided with a plurality of flattening protrusions 21. The plurality of flattening protrusions 21 are used to correspond to a plurality of tabs of the battery module 200 one by one; the driving device 30 is arranged on the tooling rack 10, and the driving device 30 is connected to the flattening structure 20 and is used to drive the flattening structure 20 to move relative to the tooling rack 10 to flatten the plurality of tabs. That is to say, by setting the driving device 30 to drive the flattening structure 20 to flatten the tabs, the automatic flattening of the tabs can be realized, reducing the time and workload invested in manual flattening; and by providing a plurality of flattening protrusions 21 on the flattening structure 20, the plurality of tabs on the battery module 200 can be flattened simultaneously, thus significantly improving the working efficiency.

[0060] The above are only specific embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery module tab flattening tooling, characterized in that, Comprising: A tooling rack (10); A flattening structure (20), the flattening structure (20) being movably connected to the tooling rack (10), and the flattening structure (20) being provided with a plurality of flattening protrusions (21), the plurality of flattening protrusions (21) being used to correspond to a plurality of tab ears of a battery module (200) one by one; and A driving device (30), the driving device (30) being disposed on the tooling rack (10), and the driving device (30) being connected to the flattening structure (20) for driving the flattening structure (20) to move relative to the tooling rack (10) so as to flatten the plurality of tab ears.

2. The ear flattening tooling for the battery module according to claim 1, characterized in that, The flattening structure (20) includes a guide rod (22) and a flattening plate (23), the guide rod (22) being movably connected to the tooling rack (10); the flattening plate (23) is connected to the guide rod (22), and the plurality of flattening protrusions (21) are disposed on a side of the flattening plate (23) away from the guide rod (22), and the driving device (30) is connected to the flattening plate (23).

3. The ear flattening tooling for battery modules according to claim 2, characterized in that, The number of the guide rods (22) is two, the two guide rods (22) are spaced apart, and the driving device (30) is located between the two guide rods (22).

4. The ear flattening tooling for the battery module according to claim 1, wherein The driving device (30) includes a motor (31) and a lifting mechanism (32), both the motor (31) and the lifting mechanism (32) being disposed on the tooling rack (10), the motor (31) being in transmission connection with the lifting mechanism (32), and the lifting mechanism (32) being connected to the flattening structure (20).

5. The ear flattening tooling for the battery module according to claim 4, characterized in that, The lifting mechanism (32) includes a driving gear (321), a driven gear (322) and a lifting rod (323), the driving gear (321) being in transmission connection with the motor (31) and meshing with the driven gear (322); The driven gear (322) is rotatably disposed on the tooling rack (10) and sleeved on the lifting rod (323); the lifting rod (323) passes through the tooling rack (10) and the driven gear (322) at the same time, and the lifting rod (323) is in threaded connection with the driven gear (322), and the flattening structure (20) is connected to the lifting rod (323).

6. The ear flattening tooling for battery modules according to claim 5, wherein, The tooling rack (10) is provided with a limiting protrusion (15), the limiting protrusion (15) is provided with a rotating groove (151), and a circumferential limiting groove (152) is provided on a side wall of the rotating groove (151); the driven gear (322) includes a gear portion (3221), a rotating portion (3222) and a circumferential limiting portion (3223) connected in sequence, the gear portion (3221) meshing with the driving gear (321), the rotating portion (3222) being disposed in the rotating groove (151), and the circumferential limiting portion (3223) being rotatably clamped in the circumferential limiting groove (152); The lifting rod (323) is simultaneously disposed through the rotation groove (151), the annular limiting portion (3223), the rotating portion (3222), and the gear portion (3221), and the lifting rod (323) is simultaneously threadedly connected to the annular limiting portion (3223), the rotating portion (3222), and the gear portion (3221).

7. The ear flattening tooling for battery modules according to claim 1, characterized in that, The tooling rack (10) includes a fixing plate (11), a first side plate (12), and a second side plate (13). The first side plate (12) and the second side plate (13) are arranged at intervals, the fixing plate (11) is disposed between the first side plate (12) and the second side plate (13), and is simultaneously connected to the first side plate (12) and the second side plate (13); The flattening structure (20) is movably connected to the fixing plate (11), the driving device (30) is disposed on the fixing plate (11), and both the flattening structure (20) and the driving device (30) are located between the first side plate (12) and the second side plate (13).

8. The ear flattening tooling for battery modules according to claim 7, wherein, The battery module tab flattening tooling (100) further includes a mounting frame (40). The mounting frame (40) is disposed between the first side plate (12) and the second side plate (13), and is located on a side of the flattening structure (20) away from the fixing plate (11); the mounting frame (40) is used for mounting the battery module (200), and the plurality of flattening protrusions (21) are disposed on a side of the flattening structure (20) close to the mounting frame (40).

9. The ear flattening tooling for battery modules according to claim 8, wherein, The mounting frame (40) is provided with a guiding groove (41).

10. The ear flattening tooling for battery modules according to claim 7, characterized in that, The tooling rack (10) further includes a protection plate (14). The protection plate (14) is arranged at an interval from the fixing plate (11), and is located on a side of the fixing plate (11) away from the flattening structure (20). The protection plate (14) is simultaneously connected to the first side plate (12) and the second side plate (13), and the driving device (30) is located between the protection plate (14) and the fixing plate (11).

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