Cylindrical battery shell

Abstract

The utility model provides a cylindrical battery shell, and relates to the technical field of batteries. The cylindrical battery shell comprises a main body and an end cover, and the main body is connected with the end cover by welding; the main body comprises an opening and a connecting part, the opening and the connecting part are located at the same end of the main body, and the connecting part is arranged around the opening; the end cover comprises a cover body and a convex edge, and the convex edge is arranged around the outer edge of the cover body; the cover body is used for covering the opening, and the convex edge is used for being arranged on the connecting part in a sleeving mode. The cover body of the end cover can be stably arranged on the opening of the main body in a covering mode, and the situation that dislocation occurs between the cover body and the opening due to vibration and the like can be avoided.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a cylindrical battery housing. Background Art

[0002] Energy storage systems are usually composed of multiple batteries. During the production process, after the content is filled in the housing of a cylindrical battery, a cover plate needs to be set on the opening of the housing to seal the opening.

[0003] When assembling the cover plate and the housing, the cover plate is placed on the opening so that the opening is covered by the cover plate; subsequently, both the cover plate and the housing will be transferred to the next process along the assembly line. During this process, once there is a slight vibration or the like, misalignment may occur between the cover plate and the opening, resulting in partial exposure of the opening. Therefore, it is also necessary for the staff to manually adjust the position between the cover plate and the opening so that the opening is completely covered by the cover plate. Utility Model Content

[0004] The purpose of this application is to overcome the defects of the prior art and provide a cylindrical battery housing to solve the problems in the prior art.

[0005] To solve the above problems, an embodiment of this application provides a cylindrical battery housing, including a main body and an end cover, wherein the main body and the end cover are connected by welding;

[0006] The main body includes an opening and a connecting portion, both the opening and the connecting portion are located at the same end of the main body, wherein the connecting portion surrounds the opening;

[0007] The end cover includes a cover body and a convex edge, and the convex edge surrounds the outer edge of the cover body;

[0008] The cover body is used to cover the opening, and the convex edge is used to sleeved on the connecting portion;

[0009] The cover body includes a first end face and a second end face, wherein the first end face and the second end face are respectively located on both sides of the cover body in the thickness direction;

[0010] The convex edge surrounds the outer edge of the first end face, and the protruding direction of the convex edge is away from the second end face.

[0011] In a possible implementation manner, the convex edge includes an extension portion, and the extension portion extends towards the side away from the cover body; the extension portion is a ring structure, and the extension portion surrounds the central axis of the cover body; wherein, the extension portion is used to sleeved on the outer wall of the main body.

[0012] In a possible implementation, a guiding structure is provided on the convex edge or / and the connecting part, and the guiding structure is configured to guide the assembly between the convex edge and the connecting part.

[0013] In a possible implementation, the guiding structure includes a first guiding inclined surface provided on the convex edge; the first guiding inclined surface is located on the inner wall of the convex edge;

[0014] The guiding structure further includes a second guiding inclined surface provided on the connecting part; the first end of the second guiding inclined surface is connected to the outer edge of the opening, and the second end extends to the outer peripheral surface of the main body;

[0015] Wherein, the first guiding inclined surface is in contact with the second guiding inclined surface.

[0016] In a possible implementation, the first guiding inclined surface is arranged around the central axis of the cover body; wherein, from the first end to the second end of the first guiding inclined surface, the distance between the first guiding inclined surface and the central axis of the cover body gradually increases; the first end of the first guiding inclined surface is closer to the first end face than the second end;

[0017] The second guiding inclined surface is arranged around the central axis of the main body; wherein, from the first end to the second end of the second guiding inclined surface, the distance between the second guiding inclined surface and the central axis of the main body gradually increases.

[0018] In a possible implementation, a first annular groove is provided at one end of the convex edge away from the first end face; the first annular groove is partially located on the inner wall of the convex edge; the first annular groove is arranged along the circumferential direction of the convex edge; a welding layer is formed in the first annular groove, and the main body and the end cover are fixedly connected through the welding layer; or,

[0019] A second annular groove is provided on the outer wall of the main body, and the second annular groove is arranged along the circumferential direction of the main body; the second annular groove partially faces the inner wall of the convex edge; a welding layer is formed in the second annular groove, and the main body and the end cover are fixedly connected through the welding layer.

[0020] In a possible implementation, the main body is cylindrical, the cross-section of the cover body is circular, and the cross-section of the opening is circular.

[0021] In a possible implementation, the length of the main body is greater than the diameter of the opening.

[0022] In a possible implementation, the outer peripheral surfaces of both the convex edge and the cover body are cylindrical surfaces.

[0023] In a possible implementation, the outer peripheral surfaces of both the convex edge and the cover body are coaxial and have the same radius.

[0024] The beneficial effects of this application include:

[0025] The cylindrical battery housing proposed in this application includes a main body and an end cover. During assembly, the cover body of the end cover is placed on the opening of the main body, and the convex edge of the end cover is sleeved on the connecting portion of the main body. Through the cooperation between the convex edge and the connecting portion, the relative position between the cover body and the opening is defined, thereby avoiding the dislocation between the cover body and the opening due to vibration or other reasons. After assembly is completed, the main body and the end cover are fixedly connected by welding.

[0026] The cover body of the end cover can be stably placed on the opening of the main body, and it can avoid the dislocation between the cover body and the opening due to vibration or other reasons. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of this application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0028] Figure 1 Shows a schematic diagram of the assembled main body and end cover;

[0029] Figure 2 Shows Figure 1 exploded schematic diagram of;

[0030] Figure 3 Shows Figure 1 cross-sectional view of;

[0031] Figure 4 Shows a cross-sectional view of a main body;

[0032] Figure 5 Shows a cross-sectional view of an end cover;

[0033] Figure 6 Shows a schematic diagram of the assembled main body and end cover provided with an extension portion;

[0034] Figure 7 Shows Figure 6 cross-sectional view of;

[0035] Figure 8 Shows a cross-sectional view of an end cover with an extension portion;

[0036] Figure 9 Shows Figure 5Partial enlarged view in the direction of a;

[0037] Figure 10 shows Figure 4 Partial enlarged view in the direction of b in.

[0038] Description of main component symbols:

[0039] 100 - Main body; 110 - Opening; 120 - Connecting part; 121 - Second guiding inclined surface; 122 - Second annular groove; 200 - End cover; 210 - Cover body; 211 - First end face; 212 - Second end face; 220 - Convex edge; 221 - First guiding inclined surface; 222 - First annular groove; 230 - Extension part. Specific embodiments

[0040] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0042] In the present application, the first end and the second end of the first guiding inclined surface respectively represent the two ends of the first guiding inclined surface; the first end and the second end of the second guiding inclined surface respectively represent the two ends of the second guiding inclined surface.

[0043] Embodiment

[0044] Refer to Figures 1 - 3 , in this embodiment, a cylindrical battery housing is proposed, including a main body 100 and an end cover 200, wherein the main body 100 is welded to the end cover 200.

[0045] As Figure 4 shown, the main body 100 includes an opening 110 and a connecting part 120. Both the opening 110 and the connecting part 120 are located at the same end of the main body 100, wherein the connecting part 120 is arranged around the opening 110. Figure 4 The dashed line in represents the central axis of the main body 100.

[0046] As shown in Figure 5 , the end cover 200 includes a cover body 210 and a flange 220. The flange 220 is disposed around the outer edge of the cover body 210. Among them, the cover body 210 and the flange 220 can be an integral structure. Figure 5 The dashed line in Figure 5 represents the central axis of the cover body 210; in

[0047] , different hatching lines are used for the cover body 210 and the flange 220 only for the convenience of observing and distinguishing different parts.

[0048] As shown in Figure 5 , the cover body 210 includes a first end face 211 and a second end face 212. Among them, the first end face 211 and the second end face 212 are respectively disposed on both sides of the cover body 210 in the thickness direction. The flange 220 is disposed around the outer edge of the first end face 211, and the protruding direction of the flange 220 is away from the second end face 212. The thickness direction of the cover body 210 is parallel to the central axis of the cover body 210.

[0049] As shown in Figures 6 - 8 , in some embodiments, the flange 220 further includes an extension portion 230. The extension portion 230 extends toward the side away from the cover body 210. The extension portion 230 is an annular structure and is disposed around the central axis of the cover body 210. Among them, the extension portion 230 is used for sleeving on the outer wall of the main body 100. The extension portion 230 can play roles such as limiting and positioning. After the main body 100 and the end cover 200 are assembled, since the extension portion 230 is sleeved on the outer wall of the main body, the relative positions between the main body 100 and the end cover 200 can be effectively restricted, avoiding misalignment and other situations between the main body 100 and the end cover 200.

[0050] In Figure 8 , different hatching lines are used for the cover body 210, the flange 220 and the extension portion 230 only for the convenience of observing and distinguishing different parts. Among them, the cover body 210, the flange 220 and the extension portion 230 can be an integral structure.

[0051] A guiding structure is provided on the convex edge 220 and / or the connecting portion 120, and the guiding structure is configured to guide the assembly between the convex edge 220 and the connecting portion 120. Due to the existence of the guiding structure, when the main body 100 and the end cover 200 are assembled, the convex edge 220 can be quickly and accurately sleeved on the connecting portion 120, and the cover body 210 is covered on the opening 110. In addition, the guiding structure can effectively improve the assembly efficiency between the main body 100 and the end cover 200.

[0052] In this embodiment, guiding structures are provided on both the convex edge 220 and the connecting portion 120.

[0053] Specifically, the guiding structure includes a first guiding inclined surface 221 provided on the convex edge 220. Among them, the first guiding inclined surface 221 is located on the inner wall of the convex edge 220.

[0054] The guiding structure further includes a second guiding inclined surface 121 provided on the connecting portion 120. The first end of the second guiding inclined surface 121 is connected to the outer edge of the opening 110, and the second end extends to the outer peripheral surface of the main body 100. Refer to Figure 4 ., the left end of the second guiding inclined surface 121 is the first end, and the right end is the second end.

[0055] After the assembly between the main body 100 and the end cover 200 is completed, the first guiding inclined surface 221 is in contact with the second guiding inclined surface 121.

[0056] In this embodiment, the first guiding inclined surface 221 is arranged around the central axis of the cover body 210. Among them, from the first end to the second end of the first guiding inclined surface 221, the distance between the first guiding inclined surface 221 and the central axis of the cover body 210 gradually increases. The first end and the second end of the first guiding inclined surface 221 are the two ends of the first guiding inclined surface 221. Among them, the first end of the first guiding inclined surface 221 is closer to the first end face 211 than the second end.

[0057] Specifically, the first end of the first guiding inclined surface 221 is connected to the first end face 211. Refer to Figure 5 ., the left end of the first guiding inclined surface 221 is the first end, and the right end is the second end.

[0058] The second guiding inclined surface 121 is arranged around the central axis of the main body 100. Among them, from the first end to the second end of the second guiding inclined surface 121, the distance between the second guiding inclined surface 121 and the central axis of the main body 100 gradually increases.

[0059] Refer to Figure 5 and Figure 9, in some embodiments, a first annular groove 222 is provided at one end of the convex edge 220 away from the first end face 211. The first annular groove 222 is partially located on the inner wall of the convex edge 220. Specifically, the first annular groove 222 is partially located on the first guiding inclined surface 221. The first annular groove 222 is arranged along the circumferential direction of the convex edge 220. Wherein, a welding layer is formed in the first annular groove, and the main body 100 and the end cover 200 are fixedly connected through the welding layer. When welding, the welding head of the laser welding is aligned with the first annular groove 222, and thus the welding layer is formed, so that the main body 100 and the end cover 200 are fixedly connected through the welding layer.

[0060] Referring to Figure 4 and Figure 10 , in other embodiments, a second annular groove 122 is provided on the outer wall of the main body 100. The second annular groove 122 is arranged along the circumferential direction of the main body 100. The second annular groove 122 partially faces the inner wall of the convex edge 220 and is located on the second guiding inclined surface 121; the other part extends outside the convex edge 220. A welding layer is formed in the second annular groove 122, and the main body 100 and the end cover 200 are fixedly connected through the welding layer. When welding, the welding head of the laser welding is aligned with the second annular groove 122, and thus the welding layer is formed, so that the main body 100 and the end cover 200 are fixedly connected through the welding layer.

[0061] In this embodiment, the main body 100 is in a cylindrical shape, the cross-section of the cover body 210 is circular, and the cross-section of the opening 110 is circular. Wherein, the length of the main body 100 is greater than the diameter of the opening 110.

[0062] Furthermore, the outer peripheral surfaces of both the convex edge 220 and the cover body 210 are cylindrical surfaces. Wherein, the outer peripheral surfaces of both the convex edge 220 and the cover body 210 are coaxial and have the same radius. Such a setting enables the outer peripheral surface of the end cover 200 to form a complete cylindrical surface.

[0063] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0064] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A cylindrical battery case, characterized in that, It includes a main body and an end cap, wherein the main body is connected to the end cap by welding; The main body includes an opening and a connecting portion, both the opening and the connecting portion are located at the same end of the main body, wherein the connecting portion surrounds the opening; The end cap includes a cover body and a convex edge, the convex edge surrounds the outer edge of the cover body; The cover body is used to cover the opening, and the convex edge is used to sleeved on the connecting portion; The cover body includes a first end face and a second end face, wherein the first end face and the second end face are respectively disposed on both sides of the thickness direction of the cover body; The convex edge surrounds the outer edge of the first end face, and the protruding direction of the convex edge is away from the second end face.

2. The cylindrical battery housing according to claim 1, characterized in that, The convex edge includes an extension portion, the extension portion extends toward the side away from the cover body; the extension portion is a ring structure, the extension portion surrounds the central axis of the cover body; wherein, the extension portion is used to sleeved on the outer wall of the main body.

3. The cylindrical battery housing according to claim 1 or 2, characterized in that, A guiding structure is provided on the convex edge or / and the connecting portion, and the guiding structure is configured to guide the assembly between the convex edge and the connecting portion.

4. The cylindrical battery housing according to claim 3, characterized in that, The guiding structure includes a first guiding inclined surface provided on the convex edge; the first guiding inclined surface is located on the inner wall of the convex edge; The guiding structure further includes a second guiding inclined surface provided on the connecting portion; the first end of the second guiding inclined surface is connected to the outer edge of the opening, and the second end extends to the outer peripheral surface of the main body; Wherein, the first guiding inclined surface is in contact with the second guiding inclined surface.

5. The cylindrical battery case according to claim 4, wherein, The first guiding inclined surface surrounds the central axis of the cover body; wherein, from the first end to the second end of the first guiding inclined surface, the distance between the first guiding inclined surface and the central axis of the cover body gradually increases; the first end of the first guiding inclined surface is closer to the first end face than the second end; The second guiding inclined surface surrounds the central axis of the main body; wherein, from the first end to the second end of the second guiding inclined surface, the distance between the second guiding inclined surface and the central axis of the main body gradually increases.

6. The cylindrical battery housing according to claim 1 or 2, characterized in that, A first annular groove is provided at one end of the convex edge away from the first end face; the first annular groove is partially located on the inner wall of the convex edge; the first annular groove is arranged along the circumferential direction of the convex edge; a welding layer is formed in the first annular groove, and the main body and the end cap are fixedly connected through the welding layer; or, A second annular groove is provided on the outer wall of the main body, the second annular groove is arranged along the circumferential direction of the main body; the second annular groove partially faces the inner wall of the convex edge; a welding layer is formed in the second annular groove, and the main body and the end cap are fixedly connected through the welding layer.

7. The cylindrical battery case according to claim 1, characterized in that, The main body is cylindrical, the cross-section of the cover body is circular, and the cross-section of the opening is circular.

8. The cylindrical battery housing according to claim 7, characterized in that, The length of the main body is greater than the diameter of the opening.

9. The cylindrical battery case according to claim 7, characterized in that, The outer peripheral surfaces of both the convex edge and the cover body are cylindrical surfaces.

10. The cylindrical battery housing according to claim 9, wherein, The outer peripheral surfaces of both the convex edge and the cover body are coaxial and have the same radius.

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