All-tab cylindrical battery packaging structure

Abstract

The utility model discloses a full-tab cylindrical battery packaging structure, which comprises a shell and a cap, the shell and the lower cap enclose to form an accommodating cavity for accommodating a roll core, and the cap comprises a plane part and a protruding part protruding along one side of the thickness direction of the plane part. The inner periphery of the side, corresponding to the cover cap, of the shell is sunken downwards to form a sunken groove, the diameter of the sunken groove is the same as the outer diameter of the plane part, and the outer diameter of the protruding part is the same as the inner diameter of the wall thickness position of the shell. The utility model has the beneficial effects that the sealing performance of the battery is improved by adopting a double-welding mode.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, in particular to the field of battery packaging, and specifically relates to a full-ear cylindrical battery packaging structure. Background Art

[0002] With the development of the industry, lithium (sodium) ion batteries are being used in more and more scenarios. Among them, cylindrical batteries account for the largest proportion. There are currently two ways to seal cylindrical batteries, one is laser sealing and the other is mechanical sealing, which is completed by squeezing the sealing ring. Single laser sealing is prone to poor sealing welding and abnormal sand spots, and the frequency of abnormal steel shell welding is higher. The mechanical sealing method has a small welding area between the core and the outside, and there is a limit on the overcurrent capacity. Utility Model Content

[0003] The utility model aims to provide a full-ear cylindrical battery packaging structure.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A full-ear cylindrical battery packaging structure includes a shell and a cap, wherein the shell and the lower cap are combined to form a housing cavity for accommodating a winding core, the cap includes a planar portion and a protruding portion protruding on one side along the thickness direction of the planar portion, the inner periphery of one side of the shell corresponding to the cap is recessed downward to form a recessed groove, the diameter of the recessed groove is the same as the outer diameter of the planar portion, and the outer diameter of the protruding portion is the same as the inner diameter of the shell wall thickness.

[0006] Preferably, a hinge between the protrusion and the plane portion is laser welded to the inner wall of the shell for the first time, and an outer peripheral wall of the plane portion away from the protrusion is laser welded to the inner wall of the recessed groove for the second time.

[0007] Preferably, a high temperature resistant coating is applied on the inner peripheral wall of the shell.

[0008] Preferably, the thickness of the shell is between 0.3 mm and 0.6 mm.

[0009] Preferably, the shell and the cap are made of the same material.

[0010] Preferably, the cap is provided with a groove along its welding position for offsetting the weld.

[0011] The beneficial effect of the utility model is that the first laser welding seal is performed at the step contact position, and then the second laser welding is performed at the top contact position. The double welding can ensure the sealing and provide the flow capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a cross-sectional view of the utility model.

[0013] Figure 2 It is a top view of the cover plate in the utility model.

[0014] Figure 3 It is a partial schematic diagram of the utility model.

[0015] Among them: a housing 10 , a recessed groove 12 , a cover cap 14 , a flat portion 16 , a protruding portion 18 , and a receiving cavity 20 . DETAILED DESCRIPTION

[0016] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0017] like Figures 1 to 3 As shown, one embodiment of the utility model comprises a shell 10 and a cap 14. The shell 10 and the lower cap 14 enclose a receiving cavity 20 for receiving a winding core. The cap 14 comprises a plane portion 16 and a protruding portion 18 protruding along one side of the plane portion 16 in the thickness direction. The inner periphery of one side of the shell 10 corresponding to the cap 14 is concave downward to form a concave groove 12. The diameter of the concave groove 12 is the same as the outer diameter of the plane portion 16. The outer diameter of the protruding portion 18 is the same as the inner diameter of the shell 10 at the wall thickness.

[0018] After the winding core is placed into the shell 10, the cap 14 is placed on the top of the shell 10 for packaging. The cap 14 is designed to be convex in shape, and a recessed groove 12 is provided on the shell 10 so that the top of the shell 10 is stepped, which is compatible with the cap 14. After the cap 14 is placed in, the recessed groove 12 will block the flat portion 16 of the cap 14 to prevent it from falling. At the same time, the groove depth of the recessed groove 12 is the same as the thickness of the flat portion 16 of the cap 14, so that the upper surface of the shell 10 and the cap 14 can be flush, which is convenient for subsequent welding.

[0019] The hinge between the protruding portion 18 and the plane portion 16 is laser welded to the inner wall of the housing 10 for the first time, and the outer peripheral wall of the plane portion 16 away from the protruding portion 18 is laser welded to the inner wall of the recessed groove 12 for the second time;

[0020] The first laser welding is performed at the step, and penetration welding is performed from the cap 14. The second laser welding is performed at the junction between the top of the cap 14 and the shell 10. The double welding can increase the sealing performance and provide the flow capacity.

[0021] The inner wall of the shell 10 is coated with a high temperature resistant coating, which can improve the heat insulation and high temperature resistance performance of the shell 10.

[0022] The thickness of the housing 10 is between 0.3 mm and 0.6 mm.

[0023] The shell 10 and the cap 14 are made of the same material; the same material facilitates laser welding.

[0024] The cap 14 is provided with a groove along its welding position for offsetting the weld. During welding, a weld will be produced which protrudes from the surface of the welded object. By providing the groove at the welding position, part of the weld can be offset, making the surface smoother.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A full-ear cylindrical battery packaging structure, characterized in that: It includes a shell and a cover cap, the shell and the lower cover cap together form a accommodating cavity for accommodating the winding core, the cover cap includes a flat portion and a protruding portion protruding on one side along the thickness direction of the flat portion, the inner periphery of one side of the shell corresponding to the cover cap is recessed downward to form a recessed groove, the diameter of the recessed groove is the same as the outer diameter of the flat portion, and the outer diameter of the protruding portion is the same as the inner diameter of the shell wall thickness.

2. The full-ear cylindrical battery packaging structure according to claim 1, characterized in that: The hinge between the protruding portion and the plane portion is laser welded to the inner wall of the shell for the first time, and the outer peripheral wall of the plane portion away from the protruding portion is laser welded to the inner wall of the recessed groove for the second time.

3. The full-ear cylindrical battery packaging structure according to claim 1, characterized in that: The inner peripheral wall of the shell is coated with a high temperature resistant coating.

4. The full-ear cylindrical battery packaging structure according to claim 1, characterized in that: The thickness of the shell is between 0.3 mm and 0.6 mm.

5. The full-ear cylindrical battery packaging structure according to claim 1, characterized in that: The shell and the cap are made of the same material.

6. The full-ear cylindrical battery packaging structure according to claim 2, characterized in that: The cap is provided with a groove along its welding position for offsetting the welding seam.

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