Battery shell and single battery

Abstract

The utility model provides a battery shell and a single battery, and the battery shell comprises a bottom shell with an opening end; the cover plate is mounted at the opening end of the bottom shell; one of the open end of the bottom shell and the contour edge of the cover plate is provided with a flanging structure, the other one is provided with an annular plate matched with the flanging structure, and the annular plate extends into the flanging structure and is in close fit with the flanging structure. The annular plate extends into a clamping or inserting assembly structure in the turning plate structure, so that the structural stability of the assembly of the bottom shell and the cover plate can be improved, the step of positioning the bottom shell and the cover plate in the welding process to prevent dislocation can be omitted, and the assembly precision of the cover plate and the bottom shell and the precision of the welded battery shell can be improved; and before welding, the flanging structure can be extruded to enable the annular plate to be fully attached to the flanging structure, so that the possibility of pseudo soldering can be effectively reduced, and the sealing performance of the bottom shell and cover plate connecting structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell and a single battery. Background Art

[0002] The battery case is usually a split structure, specifically including a bottom shell with an open end and a cover plate for sealing the open end of the bottom shell. Since the winding core needs to be assembled in the bottom shell and the electrolyte needs to be filled at the same time, the sealing of the connection structure between the bottom shell and the cover plate needs to be ensured after assembly to prevent leakage. In the conventional battery case structure, the cover plate is overlapped with the bottom shell and then welded. During the welding process, the cover plate and the bottom shell need to be positioned to prevent the two from being misaligned during the welding process and affecting the welding quality. At the same time, this conventional overlap structure has a low degree of fit between each other and is prone to cold welding. Utility Model Content

[0003] In view of the shortcomings of the prior art, the first object of the present invention is to provide a battery casing, which is easy to process, has a low risk of poor welding between the cover plate and the bottom shell, and has good sealing performance.

[0004] The second object of the utility model is to provide a single cell with good sealing performance and high safety.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A battery shell comprises: a bottom shell having an open end; a cover plate mounted on the open end of the bottom shell; one of the open end of the bottom shell and the contour edge of the cover plate is provided with a flange structure, and the other is provided with an annular plate adapted to the flange structure, the annular plate extends into the flange structure and is tightly matched with the flange structure.

[0007] According to a preferred embodiment, the flange structure includes a first folded section extending outward along the inner cavity of the bottom shell and a second folded section extending inward along the inner cavity of the bottom shell, and the first folded section and the second folded section are connected by a first bending section at one end away from the inner cavity of the bottom shell; the annular plate is located between the first folded section and the second folded section, and the annular plate is attached to the first folded section and the second folded section.

[0008] According to a preferred embodiment, the first folding section, the first bending section and the second folding section are integrally formed, the first folding section is parallel to the second folding section, and the first bending section is perpendicular to the first folding section; and there is an assembly gap between the annular plate and the first bending section.

[0009] According to a preferred embodiment, the width of the assembly gap is D1, the maximum length of the first folded section in the width direction of the assembly gap is D2, and the wall thickness of the first folded section is D3, then: 0<D1≤D2-D3.

[0010] According to a preferred embodiment, the first folding section, the first bending section and the second folding section are integrally formed, the first folding section is parallel to the second folding section, and the first bending section is perpendicular to the first folding section; the annular plate abuts against the first bending section.

[0011] According to a preferred embodiment, the flange structure is provided with a notch at a corner position.

[0012] According to a preferred embodiment, the corner of the flange structure is configured as an arc corner, and the notch at least covers the arc corner.

[0013] According to a preferred embodiment, the notch is opened in the second folded section or in the second folded section and at least a part of the first folded section.

[0014] According to a preferred embodiment, a second bending section is provided on the annular plate, and the second bending section is located on the side away from the first bending section.

[0015] A single cell battery comprises a winding core and the aforementioned battery casing, wherein the winding core is arranged in the battery casing.

[0016] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0017] The annular plate of the utility model extends to the card-connected or plug-in assembly structure in the flap structure, which can form a pre-assembled structure of the bottom shell and the cover plate before they are welded and sealed, thereby improving the structural stability of the assembly of the bottom shell and the cover plate, thereby eliminating the step of positioning the two during welding to prevent misalignment, which is beneficial to improving the assembly accuracy of the cover plate and the bottom shell and the accuracy of the battery shell after welding; and before welding, the flange structure can be extruded to make the annular plate fully fit the flange structure, thereby effectively reducing the possibility of cold welding and improving the sealing of the connection structure between the bottom shell and the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the 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 certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a first single cell provided in an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the top view of the first single cell provided in an embodiment of the utility model;

[0021] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the AA section;

[0022] Figure 4 for Figure 3 A partial enlarged schematic diagram of the structure at B in the middle;

[0023] Figure 5 A schematic diagram of the structure of the second type of single cell battery provided by the embodiment of the utility model in cooperation with the annular plate;

[0024] Figure 6 A schematic diagram of the three-dimensional structure of the first type of single cell provided by the embodiment of the utility model after the flange structure is configured with a notch;

[0025] Figure 7 A schematic diagram of the structure of the third type of single cell battery provided by the embodiment of the utility model in cooperation with the annular plate;

[0026] Figure 8 A schematic diagram of the structure of the fourth type of single cell battery provided by the embodiment of the utility model in cooperation with the annular plate;

[0027] Fig. 9 for Figure 3 A partial enlarged schematic diagram of the structure at point C in the middle.

[0028] Icon: 1- bottom shell, 2- cover plate, 31- annular plate, 32- flange structure, 321- first folding section, 322- first bending section, 323- second folding section, 324- notch, 33- second bending section, 4- assembly gap, 5- winding core. DETAILED DESCRIPTION

[0029] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] Please refer to Figures 1 to 8 A battery housing includes a bottom shell 1 and a cover plate 2, wherein the bottom shell 1 has an open end; the cover plate 2 is mounted on the open end of the bottom shell 1; one of the open end of the bottom shell 1 and the contour edge of the cover plate 2 is provided with a flange structure 32, and the other is provided with an annular plate 31 adapted to the flange structure 32, and the annular plate 31 extends into the flange structure 32. Specifically, as Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the annular plate 31 extends to the snap-fit ​​or plug-in assembly structure in the flange structure 32, which can form a pre-assembled structure of the bottom shell 1 and the cover plate 2 before they are welded and sealed, thereby improving the structural stability of the assembly of the bottom shell 1 and the cover plate 2, thereby eliminating the step of positioning the two during welding to prevent misalignment, which is beneficial to improving the assembly accuracy of the cover plate 2 and the bottom shell 1 and the accuracy of the battery shell after welding; and before welding, the flange structure 32 can be extruded (stamped) to make the annular plate 31 fully fit with the flange structure 32, thereby effectively reducing the possibility of cold welding and improving the sealing of the connection structure between the bottom shell 1 and the cover plate 2.

[0033] Specifically, the flange structure 32 includes a first folding section 321 extending outward from the inner cavity of the bottom shell 1 and a second folding section 323 extending inward from the inner cavity of the bottom shell 1. The first folding section 321 and the second folding section 323 are connected by a first bending section 322 at one end away from the inner cavity of the bottom shell 1; the annular plate 31 is located between the first folding section 321 and the second folding section 323, and the annular plate 31 is attached to the first folding section 321 and the second folding section 323. Figure 4 and Figure 5As shown, the annular plate 31 is integrally connected to the cover plate 2, and the flange structure 32 is integrally connected to the bottom shell 1, specifically, the first folded section 321 is connected to the bottom shell 1. The flange structure 32 is integrally bent and formed. When in use, the annular plate 31 is overlapped with the first folded section 321, and then the second folded section 323 is folded upward to cover the annular plate 31.

[0034] like Figure 7 and Figure 8 As shown, another battery housing provided by this embodiment is specifically an annular plate 31 integrally connected to the bottom shell 1, and a first folded section 321 integrally connected to the cover plate 2, firstly the first folded section 321 is overlapped on the annular plate 31, and then the second folded section 323 is folded downward to cover the annular plate 31. In this way, the flange structure 32 is simple in structure and easy to process, and can cooperate well with the annular plate 31 to achieve the sealing of the connection structure between the cover plate 2 and the bottom shell 1 while reducing the production cost.

[0035] Furthermore, the first folding section 321, the first bending section 322 and the second folding section 323 are integrally formed, the first folding section 321 is parallel to the second folding section 323, and the first bending section 322 is perpendicular to the first folding section 321; there is an assembly gap 4 between the annular plate 31 and the first bending section 322. The structural design of the first folding section 321 and the second folding section 323 being parallel can make the gap width between the two uniform, so that after being assembled with the annular plate 31, the first folding section 321 and the second folding section 323 can have sufficient fitting area with the annular plate 31, thereby ensuring the sealing between the annular plate 31 and the flange structure 32. The assembly gap 4 here is beneficial to the annular plate 31 radially outward in the bottom shell 1 when the assembly structure of the flange structure 32 and the annular plate 31 is extruded, or the annular plate 31 is extended and deformed in the direction away from the inner cavity of the bottom shell 1. Specifically, it provides sufficient deformation space for the extension and deformation of the annular plate 31 to ensure that the flange structure 32 and the annular plate 31 are fully fitted.

[0036] In this embodiment, the width of the assembly gap 4 is D1, the maximum length of the first folded section 321 in the width direction of the assembly gap 4 is D2, and the wall thickness of the first folded section 321 is D3, then: 0<D1≤D2-D3. This arrangement can prevent the cover plate 2 from falling into the bottom shell 1 during the assembly process, while ensuring the firmness of the connection between the annular plate 31 and the flange structure 32.

[0037] In another embodiment, Figure 5 and Figure 8 As shown, the annular plate 31 may also abut against the bent section.

[0038] like Figure 6As shown, in order to prevent the corner of the flange structure 32 from wrinkling during the forming (folding) process and causing the problem of loose fit with the annular plate 31, in this embodiment, the flange structure 32 is provided with a notch 324 at the corner position. Specifically, the notch 324 is provided at the second folding section 323 or the second folding section 323 and at least part of the first bending section 322. During the bending forming process of the flange structure 32, the second folding section 323 and the first bending section 322 are mainly folded and deformed, so the part where wrinkles appear at the corner position of the flange structure 32 is also concentrated at the second folding section 323 and the first bending section 322, and the first bending section 322 is small in size, so the amount of wrinkles during the bending process is small, so the notch 324 is separately provided at the second folding section 323 can also solve the problem to a large extent. Of course, as a preferred embodiment, the notch 324 is provided at the second folding section 323 and at least part of the first bending section 322.

[0039] like Figure 1 , Figure 2 and Figure 6 As shown, the corner of the flange structure 32 is configured as an arc angle, and the notch 324 at least covers the arc angle. In this way, the notch 324 can fully eliminate the problem of wrinkles at the corner of the flange structure 32 during the molding process.

[0040] Of course, in other embodiments, if the wrinkles at the corners of the flange structure 32 have little effect on the sealing of the battery housing, the notch 324 may not be provided.

[0041] In this embodiment, the annular plate 31 is provided with a second bending section 33, and the second bending section 33 is located on a side away from the first bending section 322. The second bending section 33 is integrally formed with the annular plate 31 and is used to connect the annular plate 31 with other structures. At the same time, the second bending section 33 is limited to position the second folding section 323, so as to facilitate the accurate folding operation of the second folding section 323. Figure 4 and Figure 5 As shown, the second bending section 33 is used to connect the annular plate 31 and the cover plate 2 as a whole. Figure 7 and Figure 8 As shown, the second bent section 33 is used to integrally connect the annular plate 31 and the bottom shell 1 .

[0042] like Fig. 9As shown, in this embodiment, the distance between the upper surface of the cover plate 2 of the battery housing and the lower surface of the bottom shell 1 is H, the distance between the lower surface of the first folded section 321 and the lower surface of the bottom shell 1 is H2, the distance between the lower surface of the second folded section 323 and the upper surface of the cover plate 2 is H1, and the gap width between the first folded section 321 and the second folded section 323 is T1, then: H=H1+T1+D3+H2; 0≤H1≤H-(T1+D3); 0≤H2≤H-(T1+D3); 0≤D1≤D2-D3.

[0043] This embodiment also provides a single battery, comprising a winding core 5 and the above-mentioned battery housing, wherein the winding core 5 is arranged in the battery housing. The single battery has good sealing performance and high safety.

[0044] The single cell also includes an electrode head assembly (including a sealing plastic part, a pressure ring, and a T head) and a liquid injection hole sealing part.

[0045] Specifically, the production and processing technology of the single cell is: bottom shell stamping - injection molding of sealing plastic parts - riveting of pressure ring / T-head - winding core insertion - pole ear welding - cover plate and bottom shell assembly and cover plate edge bending - bottom shell and cover plate welding - liquid injection - liquid injection hole sealant welding to form a complete single cell.

[0046] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A battery housing, characterized in that: include: A bottom shell (1) having an open end; A cover plate (2) mounted on the open end of the bottom shell (1); One of the open end of the bottom shell (1) and the contour edge of the cover plate (2) is provided with a flange structure (32), and the other is provided with an annular plate (31) adapted to the flange structure (32), and the annular plate (31) extends into the flange structure (32) and is tightly matched with the flange structure (32); The flange structure (32) comprises a first folded section (321) extending outwardly along the inner cavity of the bottom shell (1) and a second folded section (323) extending inwardly along the inner cavity of the bottom shell (1); the first folded section (321) and the second folded section (323) are connected at one end away from the inner cavity of the bottom shell (1) by a first bent section (322); The annular plate (31) is located between the first folding section (321) and the second folding section (323), and the annular plate (31) is attached to the first folding section (321) and the second folding section (323); an assembly gap (4) is provided between the annular plate (31) and the first bending section (322).

2. The battery housing according to claim 1, characterized in that: The first folding section (321), the first bending section (322) and the second folding section (323) are integrally formed; the first folding section (321) is parallel to the second folding section (323), and the first bending section (322) is perpendicular to the first folding section (321).

3. The battery housing according to claim 2, characterized in that: The width of the assembly gap (4) is D1, the maximum length of the first folded section (321) in the width direction of the assembly gap (4) is D2, and the wall thickness of the first folded section (321) is D3, then: 0<D1≤D2-D3.

4. The battery housing according to claim 1, characterized in that: The first folding section (321), the first bending section (322) and the second folding section (323) are integrally formed, the first folding section (321) is parallel to the second folding section (323), and the first bending section (322) is perpendicular to the first folding section (321); The annular plate (31) abuts against the first bending section (322).

5. The battery housing according to any one of claims 1 to 4, characterized in that: The flange structure (32) is provided with a notch (324) at a corner position.

6. The battery casing according to claim 5, characterized in that: The corner of the flange structure (32) is configured as a circular arc corner, and the notch (324) at least covers the circular arc corner.

7. The battery case according to claim 5, characterized in that: The notch (324) is opened in the second folded section (323) or in the second folded section (323) and at least a portion of the first bent section (322).

8. The battery casing according to any one of claims 1 to 4, characterized in that: The annular plate (31) is provided with a second bending section (33), and the second bending section (33) is located on the side away from the first bending section (322).

9. A single cell battery, characterized in that: It comprises a winding core (5) and a battery casing according to any one of claims 1 to 8, wherein the winding core (5) is arranged in the battery casing.

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