Battery device

Abstract

The present invention provides a battery device, comprising: a bottom plate, the bottom plate having a side plate, the side plate and the bottom plate being arranged at an angle and being connected as one piece, the bottom plate and the side plate forming a storage space for accommodating batteries, the top of the side plate having a flange extending toward the storage space; at least one frame, arranged at the edge of the bottom plate, and at least one frame arranged on the inner side of the side plate close to the storage space, the side plate covering the outer side of the frame, the flange covering at least part of the top surface of the frame, the frame having two side portions facing the storage space and away from the storage space, a cavity being formed between the two side portions, a through hole being arranged on one side of the frame close to the storage space, the outer side of the frame being welded to the side plate, and / or the top surface of the frame being welded to the flange. The bottom plate of the battery device is arranged in a basin shape, so that the bottom plate and the side plate are an integrated structure with good sealing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery device. Background Art

[0002] The battery pack is a core component of new energy vehicles. The battery pack includes a box for accommodating batteries. In the prior art, the battery pack box is usually in the form of a square bottom plate with a frame welded on the edge to enclose a storage space. However, in this battery pack box, welding is required between the bottom plate and the frame, and welding is also required between adjacent frames. Therefore, there are many welds in the battery pack box as a whole, and the sealing performance cannot be guaranteed after long-term use. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor sealing performance of the battery box in the prior art, thereby providing a battery device.

[0004] In order to solve the above problems, the present invention provides a battery device, comprising: a bottom plate, the bottom plate having a side plate, the side plate and the bottom plate are arranged at an angle and are integrally connected, the bottom plate and the side plate form a storage space for accommodating the battery, and the top of the side plate has a flange extending toward the storage space; at least one frame is arranged at the edge of the bottom plate, and at least one frame is arranged on the inner side of the side plate close to the storage space, the side plate covers the outer side surface of the frame, the flange covers at least a part of the top surface of the frame, the frame has two side portions facing the storage space and away from the storage space, a cavity is formed between the two side portions, a through hole is arranged on the side of the frame close to the storage space, the outer side surface of the frame is welded to the side plate, and / or the top surface of the frame is welded to the flange.

[0005] The present invention has the following advantages:

[0006] By utilizing the technical solution of the present invention, the bottom plate of the battery device is set to a basin shape, so that the bottom plate and the side plate are an integrated structure with good sealing performance. A frame is provided on the inner side of the side plate, and a through hole is provided on the frame. The through hole can reduce the overall weight of the battery device, increase the exhaust space when the battery is erupted, and reserve the liquid inlet and outlet when the frame is electrophoresed. And when welding the frame and the side plate, the through hole can provide an avoidance space for the welding tooling. Therefore, the technical solution of the present invention solves the problem of poor box sealing performance of the battery pack in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 A schematic diagram showing the structure of the battery device of the present invention is shown;

[0009] Figure 2 Shows Figure 1 A cross-sectional view of the battery device at the frame.

[0010] Description of reference numerals:

[0011] 10. Bottom plate; 11. Side plate; 111. Side wall; 112. Top wall; 12. Flange; 20. Frame; 21. Outer side surface; 22. Top surface; 23. Recess; 24. Inner side surface; 30. Accommodating space; 40. Cavity; 50. Through hole. DETAILED DESCRIPTION

[0012] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0014] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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.

[0015] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0016] like Figure 1 and Figure 2 As shown, an embodiment of the battery device according to the present application includes a bottom plate 10 and a frame 20. The bottom plate 10 is a basin-shaped structure, and a storage space 30 for accommodating batteries is formed in the bottom plate 10. The bottom plate 10 has a side plate 11, and the side plate 11 is arranged at an angle with the bottom plate 10, and optionally, the angle between the side plate 11 and the bottom plate 10 is in the range of 5° to 175°. Figure 2 It can be seen that a flange 12 is also provided on the top of the side plate 11, and the flange 12 is folded toward the accommodation space 30. In this embodiment, the side plate 11 and the flange 12 are arranged vertically, and of course, the two can also be arranged at other angles.

[0017] like Figure 1 and Figure 2 As shown, there is at least one frame 20, which is arranged at the edge of the bottom plate 10, and at least one frame 20 is arranged on the inner side of the side plate 11. Figure 2 It can be seen that the frame 20 has an outer side surface 21 and a top surface 22 , the side plate 11 covers the outer side surface 21 of the frame 20 , and the flange 12 covers at least a portion of the top surface 22 of the frame 20 .

[0018] Furthermore, the frame 20 is formed by bending the profile to form the cavity 40. Figure 2 It can be seen that the frame 20 has two side portions facing the accommodating space 30 and away from the accommodating space 30, and the space between the two side portions of the frame 20 forms a cavity 40. A through hole 50 is provided on one side of the frame 20 close to the accommodating space 30, and the outer side surface 21 of the frame 20 is welded to the side plate 11, and / or the top surface 22 is welded to the flange 12.

[0019] By using the technical solution of this embodiment, the bottom plate 10 of the battery device is set to a basin shape, so the bottom plate and the side plate 11 are an integrated structure with good sealing performance. A frame 20 is provided on the inner side of the side plate 11, and a through hole 50 is provided on the frame 20. The through hole 50 can reduce the overall weight of the battery device, increase the exhaust space when the battery erupts, and reserve the liquid inlet and outlet when the frame 20 is electrophoresed. And when welding the frame 20 and the side plate 11, the through hole can provide avoidance space for the welding tooling. Therefore, the technical solution of this embodiment solves the problem of poor box sealing performance of the battery pack in the prior art.

[0020] First, it should be noted that in this embodiment, “inside” or “inner side” refers to the side facing the accommodating space 30 , and “outside” or “outer side” refers to the side away from the accommodating space 30 .

[0021] As Figure 1 and Figure 2 shown, the bottom plate 10 of this embodiment has a basin-shaped structure, that is, the bottom plate has a bottom edge and a side plate 11. Optionally, the bottom plate 10 is integrally formed by stamping, that is, there is no weld between the bottom edge and the side plate 11, thus ensuring the sealing performance of the box body. And a flanging 12 extending inward is provided at the top of the side plate 11. At the edge position of the bottom plate 10, its cross-section forms a structure similar to a "匚" shape. And the flanging 12 can completely cover the top surface 22 of the frame 20, or the flanging 12 can only cover a part of the top surface 22 of the frame 20.

[0022] Optionally, in this embodiment, the frame 20 is formed by roll forming.

[0023] As Figure 1 and Figure 2 shown, the frame 20 of this embodiment has a long strip-shaped structure. The frame 20 forms a cavity 40 after being bent by a profile. The cross-sectional shape of the cavity 40 is generally a square structure. By setting the frame 20, on the one hand, the structural strength of the bottom plate 10 can be increased, and on the other hand, the sealing performance of the bottom plate 10 can be further enhanced.

[0024] From Figure 2 it can be seen that the surface of the frame 20 facing the accommodation space 30 is the inner side surface 24, the surface of the frame 20 facing away from the accommodation space 30 is the outer side surface 21, the surface of the frame 20 facing away from the bottom plate 10 is the top surface 22, and the surface of the frame 20 facing the bottom plate 10 is the bottom surface.

[0025] In the technical solution of this embodiment, the bottom surface of the frame 20 is in contact with the bottom plate 10, and the outer side surface 21 of the frame 20 is welded to the side plate 11. During the welding process, the through hole 50 can provide an avoidance space for the welding tooling, that is, let the welding tooling extend into the cavity 40, thereby improving the welding quality.

[0026] From Figure 2 it can be seen that the top surface 22 of the frame 20 and the flanging 12 are connected by fasteners.

[0027] In some embodiments not shown, the top surface 22 of the frame 20 and the flanging 12 can also be connected by welding. In this embodiment, the outer side surface 21 of the frame 20 and the side plate 11 can also be connected by fasteners.

[0028] In some embodiments not shown, the outer side surface 21 of the frame 20 is welded to the side plate 11, and the top surface 22 of the frame 20 is welded to the flanging 12.

[0029] In this embodiment, a plurality of frames 20 are provided, and the plurality of frames 20 are all provided at the inner side of the side plate 11. In some embodiments not shown, some of the plurality of frames 20 may also be provided at the outer side of the side plate 11. That is, at least one frame 20 may be provided at the inner side of the side plate 11.

[0030] In addition, the through hole 50 in this embodiment can reduce the overall weight of the battery device, increase the exhaust space when the battery is ejected, and reserve a liquid inlet and outlet when the frame 20 is subjected to electrophoresis.

[0031] In the technical solution of this embodiment, the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 is in the range of 30 mm to 500 mm.

[0032] It should be noted that the area of ​​the through hole 50 refers to the area of ​​the circle surrounded by the through hole 50 , and the wall thickness of the frame 20 refers to the thickness of the profile of the frame.

[0033] Specifically, the thicker the wall thickness of the frame 20 is, the larger the area of ​​the through hole 50 is. Conversely, the thinner the wall thickness of the frame 20 is, the smaller the area of ​​the through hole 50 is.

[0034] Optionally, the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 can be selected as 30 mm, 50 mm, 100 mm, 200 mm, 300 mm, 400 mm or 500 mm, etc.

[0035] Further, when only the outer side surface 21 of the frame 20 is welded to the side plate 11 , the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 is in the range of 30 mm to 500 mm.

[0036] Specifically, if only the outer side surface 21 of the frame 20 is welded to the side plate 11, the welding tool can be inserted from the through hole 50 and then moved linearly to weld the outer side surface 21 and the side plate 11. In this case, the welding tool has a relatively small demand for the moving range, so the area of ​​the through hole 50 can be appropriately reduced.

[0037] For example, when only the outer side surface 21 of the frame 20 is welded to the side plate 11, the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 can be selected as 30mm, 50mm, 100mm, 200mm, 300mm, 400mm or 500mm, etc.

[0038] Further, when only the top surface 22 of the frame 20 is welded to the flange 12 , the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 is in the range of 31 mm to 500 mm.

[0039] Specifically, if only the top surface 22 of the frame 20 is welded with the flange 12, then after the welding tool is inserted from the through hole 50, it is necessary to move a corner upwards to weld the top surface 22 and the flange 12. In this case, the welding tool has a relatively large demand for the range of movement, so it is necessary to appropriately increase the area of ​​the through hole 50, thereby increasing the range of movement of the welding tool. That is, the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 also needs to be appropriately increased. For example, when only the top surface 22 of the frame 20 is welded with the flange 12, the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 can be selected as 31mm, 50mm, 100mm, 200mm, 300mm, 400mm or 500mm, etc.

[0040] Further, when the outer side surface 21 of the frame 20 is welded to the side plate 11 and the top surface 22 of the frame 20 is welded to the flange 12, the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 is in the range of 31 mm to 500 mm.

[0041] As described above, when the outer side surface 21 of the frame 20 is welded to the side plate 11, and the top surface 22 of the frame 20 is welded to the flange 12, it is necessary to consider that after the welding tool is inserted from the through hole 50, it is necessary to move a corner upwards to weld the top surface 22 and the flange 12. Therefore, it is necessary to appropriately increase the area of ​​the through hole 50, thereby increasing the moving range of the welding tool. That is, the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 also needs to be appropriately increased.

[0042] For example, when the outer side surface 21 of the frame 20 is welded to the side panel 11 and the top surface 22 of the frame 20 is welded to the flange 12, the ratio of the area of ​​the through hole 50 to the wall thickness of the frame 20 can be selected as 31mm, 50mm, 100mm, 200mm, 300mm, 400mm or 500mm, etc.

[0043] In the technical solution of this embodiment, the bottom plate 10 includes a length direction and a width direction, and the frame 20 is a long strip structure, that is, the frame 20 also has a length direction.

[0044] from Figure 1 It can be seen that along the length direction, the minimum distance between the edge of the through hole 50 and the end of the frame 20 is greater than or equal to 3 mm.

[0045] from Figure 2 It can be seen that at the position toward the end of the frame 20, the minimum distance between the edge of the through hole 50 and the end of the frame 20 should not be too small. If the distance is too small, the portion between the edge of the through hole 50 and the end of the frame 20 is thinner, reducing the strength of the edge of the frame 20.

[0046] Optionally, along the length direction, the minimum distance between the edge of the through hole 50 and the end of the frame 20 can be selected as a larger value such as 3 mm, 4 mm, 5 mm, etc.

[0047] like Figure 1 As shown, in the technical solution of this embodiment, there are multiple through holes 50, and the multiple through holes 50 are arranged at intervals along the length direction of the frame 20.

[0048] It should be noted that the number of through holes 50 refers to that the number of through holes 50 is at least two.

[0049] Specifically, the plurality of through holes 50 can provide more avoidance space for welding tools, thereby facilitating welding operations and improving welding quality. In addition, the plurality of through holes 50 can also increase exhaust space and further reduce the overall weight of the battery device.

[0050] In some embodiments not shown, there are multiple through holes 50, and the multiple through holes 50 can also be arranged at intervals along a direction perpendicular to the bottom plate 10. That is, the multiple through holes 50 can also be arranged along Figure 1 Arranged in up and down directions.

[0051] In the technical solution of this embodiment, the ratio of the minimum spacing between adjacent through holes 50 to the depth of the cavity 40 is in the range of 0.5 to 10.

[0052] It should be noted that the spacing between adjacent through holes 50 mentioned above refers to the distance between the axes of adjacent through holes 50. And the spacing may refer to the minimum spacing between adjacent through holes 50 when multiple through holes 50 are spaced apart along the length direction of the frame 20. And the spacing may also refer to the minimum spacing between adjacent through holes 50 when multiple through holes 50 are spaced apart in a direction perpendicular to the bottom plate 10.

[0053] It should be noted that the depth of the above-mentioned cavity 40 refers to the distance between the inner wall of the outer side surface 21 of the frame 20 and the inner wall of the inner side surface 24 of the frame 20, that is, the depth of the cavity 40 in Figure 2 The left-right dimension of .

[0054] Furthermore, the ratio of the minimum spacing between adjacent through holes 50 to the depth of the cavity 40 cannot be too small. If the ratio is too small, the effect of opening the through holes 50 cannot be guaranteed. If the ratio is too large, the strength of the frame 20 will be reduced.

[0055] Optionally, the ratio of the minimum spacing between adjacent through holes 50 to the depth of the cavity 40 may be 0.5, 1, 2, 5, 10, etc.

[0056] In the technical solution of this embodiment, the ratio of the minimum spacing between adjacent through holes 50 to the length of the frame 20 is less than or equal to 0.6.

[0057] It should be noted that the minimum spacing between adjacent through holes 50 refers to the minimum spacing between adjacent through holes 50 when a plurality of through holes 50 are arranged at intervals along the length direction of the frame 20 .

[0058] Specifically, the longer the length of the frame 20 is, the smaller the minimum spacing between adjacent through holes 50 should be. The smaller the length of the frame 20 is, the larger the minimum spacing between adjacent through holes 50 should be.

[0059] Optionally, the ratio of the minimum spacing between adjacent through holes 50 to the length of the frame 20 can be 0.6, 0.5, 0.1 or other smaller values.

[0060] In the technical solution of this embodiment, the ratio of the wall thickness of the bottom plate 10 to the wall thickness of the frame 20 is in the range of 0.2 to 3.5.

[0061] It should be noted that the wall thickness of the bottom plate 10 refers to the thickness of the profile of the bottom plate 10 , and the wall thickness of the frame 20 refers to the thickness of the profile of the frame 20 .

[0062] Specifically, in order to ensure the strength of the frame 20 and the airtightness of the bottom plate 10 , it is preferred that the wall thickness of the frame 20 is greater than the wall thickness of the bottom plate 10 .

[0063] For example, the ratio of the wall thickness of the bottom plate 10 to the wall thickness of the frame 20 can be selected as 0.2, 0.5, 1, 2, 3, 3.5, etc.

[0064] In the technical solution of this embodiment, the tensile strength of the bottom plate 10 is in the range of 120 MPA to 780 MPA, and the tensile strength of the frame 20 is in the range of 590 MPA to 1500 MPA.

[0065] Specifically, the strength of the bottom plate 10 and the frame 20 should take into account both the weight and the overall strength of the battery device.

[0066] Optionally, the strength of the base plate 10 may be selected to be 120 MPA, 200 MPA, 500 MPA, 700 MPA or 780 MPA, etc.

[0067] Optionally, the strength of the frame 20 may be selected to be 590 MPA, 600 MPA, 700 MPA, 1000 MPA, 1300 MPA or 1500 MPA, etc.

[0068] like Figure 2As shown, in the technical solution of this embodiment, a recess 23 is provided on the outer side 21 of the frame 20. The recess 23 is a long strip structure, and the recess 23 is recessed from the outer side of the frame 20 toward the inner side 24.

[0069] In this embodiment, the recess 23 can not only strengthen the frame 20 , but also reduce the weight of the battery device.

[0070] like Figure 2 As shown, in the technical solution of this embodiment, the inner side surface 24 of the frame 20 close to the accommodating space 30 is a plane. Setting the inner side surface 24 as a plane can enhance the strength of the frame.

[0071] In the technical solution of this embodiment, the wall thickness of the bottom plate 10 is in the range of 0.6 mm to 3 mm.

[0072] Specifically, the wall thickness of the bottom plate 10 should be set to a value that ensures sealing without adding extra weight to the battery device.

[0073] Optionally, the wall thickness of the bottom plate 10 may be selected to be 0.6 mm, 1 mm, 2 mm, 3 mm, etc.

[0074] like Figure 2 As shown, in the technical solution of this embodiment, the side plate 11 includes a side wall 111 and a top wall 112. The side wall 111 cooperates with the outer side surface of the frame 20, and the top wall 112 coincides with the top surface 22 of the frame 20. Figure 2 Those skilled in the art will appreciate that the top wall 112 forms the flange 12 mentioned above.

[0075] Specifically, the side plate 11 is in an L-shaped structure, the side wall 111 is perpendicular to the bottom plate 10 and matches the outer side surface 21 of the frame 20 . The top wall 112 is parallel to the bottom plate 10 and matches the top surface 22 of the frame 20 .

[0076] In this embodiment, by providing the side wall 111 and the top wall 112 , the overlapping area between the bottom plate 10 and the frame 20 can be increased, thereby ensuring the sealing of the battery device.

[0077] Optionally, the welding marks between the frame 20 and the side plate 11 are intermittent welding marks, thereby saving welding costs and improving welding efficiency.

[0078] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A battery device, characterized in that: include: A bottom plate (10), the bottom plate (10) having a side plate (11), the side plate (11) being arranged at an angle with the bottom plate (10) and being integrally connected, the bottom plate (10) and the side plate (11) forming a storage space (30) for storing batteries, the top of the side plate (11) having a flange (12) extending towards the storage space (30); At least one frame (20) is arranged at the edge of the bottom plate (10), and at least one frame (20) is arranged on the inner side of the side plate (11) close to the accommodating space, the side plate (11) covers the outer side surface (21) of the frame (20), and the flange (12) covers at least a portion of the top surface (22) of the frame (20). The frame (20) has two side portions facing the accommodating space (30) and away from the accommodating space (30), a cavity (40) is formed between the two side portions, a through hole (50) is provided on a side of the frame (20) close to the accommodating space (30), an outer side surface (21) of the frame (20) is welded to the side plate (11), and / or a top surface (22) of the frame (20) is welded to the flange (12), The ratio of the area of ​​the through hole (50) to the wall thickness of the frame (20) is in the range of 30 mm to 500 mm.

2. The battery device according to claim 1, characterized in that: The outer side surface (21) of the frame (20) is welded to the side plate (11), and the ratio of the area of ​​the through hole (50) to the wall thickness of the frame (20) is in the range of 30 mm to 500 mm; or, The top surface (22) of the frame (20) is welded to the flange (12), and the ratio of the area of ​​the through hole (50) to the wall thickness of the frame (20) is in the range of 31 mm to 500 mm; or, The outer side surface (21) of the frame (20) is welded to the side plate (11), and the top surface (22) of the frame (20) is welded to the flange (12), and the ratio of the area of ​​the through hole (50) to the wall thickness of the frame (20) is in the range of 31 mm to 500 mm.

3. The battery device according to claim 1, characterized in that: The frame (20) includes a length direction, and along the length direction, the minimum distance between the edge of the through hole (50) and the end of the frame (20) is greater than or equal to 3 mm.

4. The battery device according to claim 1, characterized in that: The through holes (50) are multiple and spaced apart, and the ratio of the minimum spacing between adjacent through holes (50) to the depth of the cavity (40) is in the range of 0.5 to 10.

5. The battery device according to claim 4, characterized in that: The plurality of through holes (50) are arranged at intervals along a direction perpendicular to the bottom plate (10).

6. The battery device according to claim 5, characterized in that: The frame (20) comprises a length direction, and the plurality of through holes (50) are arranged at intervals along the length direction of the frame (20).

7. The battery device according to claim 6, characterized in that: The ratio of the minimum spacing between adjacent through holes (50) to the length of the frame (20) is less than or equal to 0.

6.

8. The battery device according to claim 1, characterized in that: The ratio of the wall thickness of the bottom plate (10) to the wall thickness of the frame (20) is in the range of 0.2 to 3.

5.

9. The battery device according to claim 1, characterized in that: The tensile strength of the bottom plate (10) is in the range of 120 MPa to 780 MPa, and the tensile strength of the frame (20) is in the range of 590 to 1500 MPa.

10. The battery device according to claim 1, characterized in that: A recess (23) is provided on the outer side surface (21) of the frame (20).

11. The battery device according to claim 1, characterized in that: The inner side surface (24) of the frame (20) close to the accommodating space (30) is a plane.

12. The battery device according to claim 7, characterized in that: The wall thickness of the bottom plate (10) is in the range of 0.6 mm to 3 mm.

13. The battery device according to claim 1, characterized in that: The side plate (11) comprises a side wall (111) and a top wall (112); the side wall (111) cooperates with the outer side surface of the frame (20); the top wall (112) forms the flange (12); and the top wall (112) overlaps with the top surface (22) of the frame (20).

14. The battery device according to claim 1, characterized in that: The welding marks between the frame (20) and the side plate (11) are intermittent welding marks.

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