Anti-cracking sealing ring for alkaline battery

Abstract

The utility model discloses an anti-cracking sealing ring for an alkaline battery, which comprises a central column, and the central column is provided with a central hole for a needle body of a current collecting nail of the alkaline battery to insert; the aperture of the central hole is not less than the diameter of the needle body; a plurality of annular protruding parts are arranged on the hole wall of the inner side of the center hole and distributed at intervals in the axial direction of the center column. And each annular lug boss is in interference fit with the needle body. Compared with the interference fit between the whole inner side hole wall of the center hole of the conventional sealing ring and the needle body, the sealing ring for the alkaline battery has the advantages that the contact surface between the sealing ring and the needle body is reduced, and the friction force is weakened, so that the overall stress of the sealing ring is reduced, and the risk of cracking of the sealing ring when a current collecting nail is inserted is reduced.

Description

Technical Field

[0001] The utility model relates to the field of alkaline battery structures, in particular to a crack-proof sealing ring for alkaline batteries. Background Art

[0002] In the field of alkaline battery manufacturing, the collector is an important accessory of alkaline batteries. The diameter of the collector pin of the collector is usually larger than the diameter of the center hole of the sealing ring. During the assembly process of the battery collector, due to the interference fit between the sealing ring (plastic part) and the collector pin, the collector pin and the sealing ring fit tightly and have large friction. A larger axial external force needs to be applied to smoothly insert the collector pin into the center hole of the sealing ring. The sealing ring sometimes cracks, causing quality accidents and battery leakage. Utility Model Content

[0003] The utility model aims to provide a crack-proof sealing ring for alkaline batteries, which can reduce the risk of the sealing ring cracking when a current collecting nail is inserted.

[0004] The technical solution for achieving the purpose of the utility model is: a crack-proof sealing ring for alkaline batteries, comprising a center column, a center hole for inserting the needle body of the alkaline battery collector pin is formed on the center column; the diameter of the center hole is ≥ the diameter of the needle body; a plurality of annular protrusions are provided on the inner hole wall of the center hole, and each of the annular protrusions is distributed at intervals along the axial direction of the center column; and each of the annular protrusions maintains an interference fit with the needle body.

[0005] Compared with the existing sealing ring in which the entire inner hole wall of the center hole is interference fit with the needle body, the sealing ring for alkaline batteries of the utility model has a smaller contact area between the sealing ring and the needle body and a weaker friction force, thereby reducing the overall stress on the sealing ring and reducing the risk of the sealing ring cracking when the current collecting pin is inserted.

[0006] Furthermore, the annular protrusion and the central column are integrally formed.

[0007] Furthermore, the annular protrusion is preferably located in the axial middle of the central column.

[0008] Furthermore, the cross section of the annular protrusion is preferably in an arc shape.

[0009] Furthermore, the inner diameter of the annular protrusion is 0.07 to 0.12 mm smaller than the diameter of the needle body.

[0010] Furthermore, the alkaline battery current collecting pin also includes a flat head, the needle body is fixedly connected at the center position of the bottom surface of the flat head, and the bottom surface of the flat head is arranged close to the end surface of the center column. The end of the center hole close to the flat head is expanded outward to form a flared portion, and the flared portion, the needle body and the flat head together form a ring-shaped first filling cavity for filling sealant. By injecting sealant into the first filling cavity when installing the current collecting pin, the sealing of the fitting seam between the current collecting pin and the sealing ring is achieved, so that the alkaline electrolyte inside the battery will be blocked by the sealant when it diffuses outward along the fitting seam between the sealing ring and the current collecting pin, thereby avoiding "alkaline climbing" and leakage. An annular groove is provided on the end surface of the center column facing the flat head, and the annular groove and the flat head together form a second filling cavity for filling sealant. By injecting sealant into the second filling cavity when installing the current collecting pin, the sealing of the fitting seam between the current collecting pin and the sealing ring is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is an axial cross-sectional structural diagram of the sealing ring of the utility model;

[0012] Figure 2 It is an expanded plan view of the inner hole wall of the central hole of the utility model;

[0013] Figure 3 This is an assembly structure diagram of the sealing ring and the alkaline battery current collecting nail of the utility model, wherein the sealing ring is an axial cross-sectional structure diagram. DETAILED DESCRIPTION

[0014] The preferred embodiment of the connection structure between the alkaline battery current collecting nail and the sealing ring of the utility model is described in detail below with reference to the accompanying drawings.

[0015] Combination Figure 1 to Figure 3 A crack-proof sealing ring for alkaline batteries comprises a central column 10, wherein the central column 10 is provided with a central hole 11 for inserting a needle body 21 of an alkaline battery current collecting nail 20; the aperture R of the central hole 11 is ≥ the diameter r of the needle body 21; two annular protrusions 30 are provided on the inner hole wall of the central hole 11, and each of the annular protrusions 30 is spaced apart along the axial direction of the central column 10, and each of the annular protrusions 30 maintains an interference fit with the needle body 21.

[0016] The sealing ring for alkaline batteries of the utility model controls the aperture R of the center hole 11 ≥ the diameter r of the needle body 21 when opening a hole in the center column 11 so that the clearance between the sealing ring and the needle body 21 is matched, and then an annular protrusion 30 is provided on the inner hole wall of the center hole 11, and the sealing between the sealing ring and the current collecting nail 20 is achieved through the interference fit between the annular protrusion 30 and the needle body 21; compared with the interference fit between the entire inner hole wall of the center hole 11 and the needle body 21 of the existing sealing ring, the contact surface between the sealing ring and the needle body 21 of the utility model is reduced and the friction force is weakened, thereby reducing the overall stress of the sealing ring and reducing the risk of the sealing ring cracking when the current collecting nail is inserted.

[0017] Of course, the number of the annular protrusions 30 may be but is not limited to two as shown in the drawings, and may also be one or more than three, and the number may be adjusted according to actual needs.

[0018] Further, such as Figure 1 , Figure 3 As shown, the annular protrusion 30 is integrally formed with the center column 10 .

[0019] Further, such as Figure 1 to Figure 3 As shown, the annular protrusion 30 is preferably located in the axial middle of the central column 10. Of course, the annular protrusion 30 can also be located at positions close to the two axial ends of the central column 10.

[0020] Further, such as Figure 1 , Figure 3 As shown, the cross section of the annular protrusion 30 is preferably in an arc shape. Of course, the cross section of the annular protrusion 30 is preferably but not limited to the arc shape shown in the drawings, and it can also be a common shape such as a trapezoid or a square.

[0021] Further, such as Figure 3 As shown, the inner diameter R′ of the annular protrusion 30 is 0.07-0.12 mm smaller than the diameter r of the needle body 21 .

[0022] Further, such as Figure 3 As shown, the alkaline battery current collecting pin 20 also includes a flat head 22, and the needle body 21 is fixedly connected at the center position of the bottom surface of the flat head 22, and the bottom surface of the flat head 22 is arranged close to the end surface of the center column 10. The end of the center hole 11 close to the flat head 22 is expanded outward to form a flared portion 111, and the flared portion 111, the needle body 21 and the flat head 22 are surrounded to form a ring-shaped first filling cavity 40 for filling with sealant. By injecting sealant into the first filling cavity 40 when installing the current collecting pin 20, the fitting seam between the current collecting pin 20 and the sealing ring is closed, so that when the alkaline electrolyte inside the battery diffuses outward along the fitting seam between the sealing ring and the current collecting pin 20, it will be blocked by the sealant to avoid "alkali creep" and leakage.

[0023] like Figure 3 As shown, an annular groove 12 is provided on the end surface of the center column 10 facing the flat head 22, and the annular groove 12 and the flat head 22 enclose a second filling cavity 50 for filling with sealant. When installing the current collecting nail 20, the sealing seam between the current collecting nail 20 and the sealing ring is closed by injecting sealant into the second filling cavity 50.

[0024] Of course, the sealing ring of the present invention may not be provided with the expanded portion 111 and the first filling cavity 40 , and may not be provided with the annular groove 12 and the second filling cavity 50 .

[0025] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A crack-proof sealing ring for alkaline batteries, comprising a central column, wherein the central column is provided with a central hole for inserting a current collecting pin of the alkaline battery; characterized in that: The diameter of the central hole is ≥ the diameter of the needle body; a plurality of annular protrusions are provided on the inner hole wall of the central hole, and the annular protrusions are spaced apart along the axial direction of the central column; and an interference fit is maintained between each annular protrusion and the needle body.

2. The anti-cracking sealing ring for alkaline batteries according to claim 1, characterized in that: The annular protrusion is integrally formed with the central column.

3. The anti-cracking sealing ring for alkaline batteries according to claim 1, characterized in that: The annular protrusion is located in the axial middle of the central column.

4. The anti-cracking sealing ring for alkaline batteries according to claim 1, characterized in that: The cross section of the annular protrusion is in an arc shape.

5. The anti-cracking sealing ring for alkaline batteries according to claim 1, characterized in that: The inner diameter of the annular protrusion is 0.07-0.12 mm smaller than the diameter of the needle body.

6. The anti-cracking sealing ring for alkaline batteries according to claim 1, characterized in that: The alkaline battery current collecting nail also includes a flat head, the needle body is fixedly connected at the center position of the bottom surface of the flat head, and the bottom surface of the flat head is arranged closely against the end surface of the center column.

7. The anti-cracking sealing ring for alkaline batteries according to claim 6, characterized in that: One end of the central hole close to the flat head is expanded outward to form a flared portion, and the flared portion, the needle body and the flat head together form an annular first filling cavity for filling sealant.

8. The anti-cracking sealing ring for alkaline batteries according to claim 6, characterized in that: An annular groove is provided on an end surface of the central column facing the flat head, and the annular groove and the flat head are combined to form a second filling cavity for filling sealant.

Images