Sealing nail assembly and battery top cover

Abstract

The utility model belongs to the technical field of battery structures, and discloses a sealing nail assembly and a battery top cover. The sealing nail assembly comprises an elastic sealing plug and a sealing nail body, a mounting hole is formed in the elastic sealing plug, the sealing nail body is inserted into the elastic sealing plug through the mounting hole, the sealing nail body can abut against the inner wall of the mounting hole so that the elastic sealing plug can abut against the inner wall of the liquid injection hole in a sealing mode, and a protruding part is arranged on the outer wall of the elastic sealing plug and can abut against the inner wall of the liquid injection hole. A concave groove is formed in the inner wall of the liquid injection hole, and the convex part can be inserted into the concave groove, so that the sealing nail assembly is arranged in the liquid injection hole in a limiting manner in the direction from the top surface to the bottom surface of the battery top cover. Through the sealing nail assembly, the liquid injection hole can be well sealed, the welding sealing mode is avoided, the leakage phenomenon caused by poor machining quality or welding quality is not prone to occurring, and the yield of batteries is increased. In addition, the sealing nail assembly has good reusability and can be conveniently pulled out and repeatedly sealed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to a sealing nail assembly and a battery top cover. Background Art

[0002] The main function of the sealing nail is to ensure the sealing of the battery casing, prevent the leakage of gas or liquid inside the battery, and prevent harmful substances such as external air and moisture from entering the battery, thereby protecting the chemical reaction environment inside the battery and extending the battery life.

[0003] After the electrolyte is injected, the injection hole will be temporarily sealed with items such as rubber plugs to prevent electrolyte leakage. Next, the sealing pins are installed in the corresponding holes on the cover body and fixed by welding or other means. This process usually uses high-precision and high-efficiency welding technologies such as laser welding, and has high requirements for the processing accuracy of the sealing pins and injection holes. When the sealing pins and the injection holes themselves have large dimensional fluctuations, it will cause a large weld gap between the sealing pins and the injection holes, which may cause leakage and affect the sealing.

[0004] Based on the above, there is an urgent need for a sealing nail assembly and a battery top cover to solve the above technical problems. Utility Model Content

[0005] One purpose of the utility model is to provide a sealing nail assembly that can well seal a liquid injection hole.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Sealing nail assembly, including:

[0008] An elastic sealing plug capable of being inserted into the liquid injection hole of the battery top cover, wherein a mounting hole is formed in the elastic sealing plug;

[0009] A sealing nail body, wherein the sealing nail body is inserted into the elastic sealing plug through the mounting hole, and the sealing nail body can abut against the inner wall of the mounting hole so that the elastic sealing plug is sealed against the inner wall of the injection hole, and

[0010] The outer wall of the elastic sealing plug is provided with a protrusion, and the inner wall of the liquid injection hole is provided with a recessed groove. The protrusion can be inserted into the recessed groove so that the sealing nail assembly is limitedly set in the liquid injection hole along the direction from the top surface to the bottom surface of the battery top cover.

[0011] Preferably, the mounting hole is a blind hole, and the sealing nail body is inserted into the mounting hole along a direction from the top surface to the bottom surface of the battery top cover; or,

[0012] The mounting hole is a through hole, and the sealing nail body is sealingly inserted into the mounting hole along a direction from the top surface to the bottom surface of the battery top cover.

[0013] Preferably, the vertical cross-sectional shape of the protrusion is at least one of a semicircular, semi-elliptical, and partially arc-shaped, and the protrusion is configured to be deformed and compressed to a size not larger than the inner diameter of the injection hole when under pressure, so that the protrusion can slide into the injection hole.

[0014] Preferably, the recessed groove has a vertical cross-sectional shape corresponding to that of the raised portion, and an inner wall of the recessed groove can be fitted and sealed with an outer wall of the raised portion.

[0015] Preferably, the elastic sealing plug includes a first part and a second part, the first part is inserted into the liquid injection hole and provided with the mounting hole, one end of the first part passes through the liquid injection hole and is located on the bottom side of the battery top cover, and the second part is connected to the other end of the first part and is located on the top side of the battery top cover, and,

[0016] The sealing nail body includes a third part and a fourth part, the third part is inserted into the mounting hole, the fourth part is connected to one end of the third part and is located on the top side of the battery top cover, and the second sealing clamp is arranged between the fourth part and the battery top cover.

[0017] Preferably, a step structure is formed between the second portion and the fourth portion, and the step structure is used to facilitate the removal of the sealing nail assembly.

[0018] Preferably, the elastic sealing plug also includes a fifth part, which is connected to one end of the first part located on the bottom side of the battery top cover, and the end of the third part located on the bottom side of the battery top cover is provided with a snap-in groove, and the fifth part can be limitedly inserted into the snap-in groove.

[0019] Preferably, along the direction from the top surface to the bottom surface of the battery top cover, the fifth portion and the raised portion are staggered.

[0020] Preferably, an arc-shaped end surface is provided at one end of the third portion located at the bottom side of the battery top cover.

[0021] The beneficial effects of the sealing nail assembly provided by the utility model are:

[0022] The aforementioned sealing nail assembly can effectively seal the liquid injection hole, achieving excellent sealing stability. Furthermore, the sealing nail assembly can adhere well to the inner wall of the liquid injection hole to achieve sealing, thereby avoiding the need for welding sealing. This makes it less likely for leakage to occur due to poor processing or welding quality, thereby improving the battery's yield rate. Furthermore, the sealing nail assembly is highly reusable and can be easily removed and resealed, thereby enabling electrolyte recovery and refilling. Furthermore, the height difference between the sealing nail body and the battery cover allows for easy detectability, facilitating yield rate testing.

[0023] Another object of the present invention is to provide a battery top cover with better sealing performance to ensure production yield.

[0024] To achieve this purpose, the present invention adopts the following technical solutions:

[0025] The battery top cover comprises a cover body and the above-mentioned sealing nail assembly, wherein the cover body has a liquid injection hole, and the sealing nail assembly is detachably and sealingly inserted in the liquid injection hole.

[0026] The battery cover provided by the present invention has the following beneficial effects:

[0027] The sealing nail assembly described above can effectively seal the liquid injection hole, achieving excellent sealing stability. Furthermore, the sealing nail assembly can effectively adhere to the inner wall of the liquid injection hole to achieve a seal, thereby avoiding welding sealing methods. This makes it less likely to cause leakage due to poor processing or welding quality, thereby improving the battery's yield rate. Furthermore, the battery top cover is highly reusable and can be easily removed and resealed, thereby enabling electrolyte recovery and refilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a top view of the battery top cover provided by the present utility model;

[0029] Figure 2 It is along Figure 1 Cross-section view in the AA direction;

[0030] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle.

[0031] In the picture:

[0032] 11. Elastic sealing plug; 111. Raised portion; 112. First portion; 113. Second portion; 1131. Step structure; 114. Fifth portion;

[0033] 12. Sealing nail body; 121. Third part; 1211. Snap-fit ​​groove; 122. Fourth part;

[0034] 2. Cover plate body; 21. Liquid injection hole; 211. Concave groove. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] The following is based on the attached Figure 1 To the attached Figure 3 The present invention provides a sealing nail assembly and a battery top cover. The sealing nail assembly can be installed on the cover plate body 2 of the battery top cover to seal the liquid injection hole 21 and solve the sealing problem caused by the large weld gap between the sealing nail and the liquid injection hole 21 in the prior art.

[0040] like Figures 1 to 3As shown, in this embodiment, the sealing pin assembly includes an elastic sealing plug 11 and a sealing pin body 12. The elastic sealing plug 11 is capable of being inserted into the liquid injection hole 21 of the cover body 2, and a mounting hole is formed in the elastic sealing plug 11. The sealing pin body 12 is inserted into the elastic sealing plug 11 through the mounting hole and abuts against the inner wall of the mounting hole, thereby causing the elastic sealing plug 11 to seal against the inner wall of the liquid injection hole 21, thereby sealing the liquid injection hole 21.

[0041] And, as Figure 3 As shown, the outer wall of the elastic sealing plug 11 is provided with a protrusion 111, and the inner wall of the liquid injection hole 21 is provided with a recessed groove 211. The protrusion 111 can be inserted into the recessed groove 211 so that the sealing nail assembly is limitedly set in the liquid injection hole 21 along the direction from the top surface to the bottom surface of the battery top cover.

[0042] During assembly, the elastic sealing plug 11 is first inserted into the liquid injection hole 21, with the protrusion 111 inserted into the recessed groove 211, thereby limiting the elastic sealing plug 11 in the direction from the top surface to the bottom surface of the battery cover. The sealing nail body 12 is then inserted into the mounting hole, so that the elastic sealing plug 11 is sealed against the inner wall of the liquid injection hole 21, thereby sealing the liquid injection hole 21. After the battery has been used for a period of time, the sealing nail assembly can be pulled out of the liquid injection hole 21 using a negative pressure device to recover or refill the electrolyte.

[0043] The above-mentioned sealing nail assembly can well seal the liquid injection hole 21 and achieve better sealing stability. The sealing nail assembly can well fit the inner wall of the liquid injection hole 21 to achieve sealing, thereby avoiding the welding sealing method. It is not easy to cause leakage due to poor processing quality or welding quality, thereby improving the yield rate of the battery. In addition, the sealing nail assembly has good reusability and can be easily pulled out and re-sealed, thereby realizing the recovery and re-injection of electrolyte. At the same time, the height difference between the sealing nail body 12 and the battery cover can easily achieve detectability, thereby facilitating the detection of yield rate.

[0044] In this embodiment, if Figure 3 As shown, the mounting hole is a through hole, and the sealing nail body 12 is sealingly inserted into the mounting hole along the direction from the top surface to the bottom surface of the battery top cover, so that the outer wall of the elastic sealing plug 11 is in contact with the inner wall of the liquid injection hole 21, thereby achieving sealing of the liquid injection hole 21. Of course, in some other embodiments, a blind hole can also be used as the mounting hole, and the sealing nail body 12 can be inserted into the mounting hole so that the outer wall of the elastic sealing plug 11 is in contact with the inner wall of the liquid injection hole 21, thereby achieving sealing of the liquid injection hole 21, which also falls within the scope of protection of the present utility model.

[0045] Preferably, the vertical cross-section of the protrusion 111 is at least one of a semicircular, semi-elliptical, and partially arc-shaped, so as to facilitate insertion of the elastic sealing plug 11 into the injection hole 21. Furthermore, the protrusion 111 can be deformed and compressed to a diameter no greater than the inner diameter of the injection hole 21 when under pressure, so that the protrusion 111 can slide into the injection hole 21.

[0046] Further preferably, the recessed groove 211 has a vertical cross-sectional shape corresponding to the raised portion 111, and when the raised portion 111 is inserted into the recessed groove 211, the inner wall of the recessed groove 211 can fit and seal with the outer wall of the raised portion 111, thereby ensuring the sealing between the elastic sealing plug 11 and the inner wall of the injection hole 21.

[0047] like Figure 3 As shown, the elastic sealing plug 11 includes a first portion 112 and a second portion 113. The raised portion 111, the first portion 112, and the second portion 113 are fixedly connected. The first portion 112 is inserted into the liquid injection hole 21 and is provided with a mounting hole. One end of the first portion 112 passes through the liquid injection hole 21 and is located on the bottom side of the battery top cover. The second portion 113 is connected to the other end of the first portion 112 and is located on the top side of the battery top cover. In addition, the sealing nail body 12 includes a third portion 121 and a fourth portion 122 that are fixedly connected. The third portion 121 is inserted into the mounting hole. The fourth portion 122 is connected to one end of the third portion 121 and is located on the top side of the battery top cover, thereby sealing the second portion 113 between the fourth portion 122 and the cover body 2. By sealing the second portion 113 between the fourth portion 122 and the cover body 2, the sealing between the liquid injection hole 21 and the sealing nail assembly can be further improved to prevent leakage.

[0048] Preferably, a step structure 1131 is formed between the second portion 113 and the fourth portion 122. The step structure 1131 is used to facilitate the extraction of the sealing nail assembly. For example, in this embodiment, the second portion 113 is an annular structure, the fourth portion 122 is a disc-shaped structure, and the diameter of the second portion 113 is smaller than that of the fourth portion 122, thereby forming the above-mentioned step structure 1131. Of course, in some other embodiments, the above-mentioned step structure 1131 can also be formed by the second portion 113 and the fourth portion 122 having other shapes such as squares.

[0049] Furthermore, the elastic sealing plug 11 also includes a fifth portion 114, which is connected to the end of the first portion 112 located on the bottom side of the battery top cover. A snap-in groove 1211 is provided at the end of the third portion 121 located on the bottom side of the battery top cover. The fifth portion 114 can be inserted into the snap-in groove 1211 to securely connect the elastic sealing plug 11 and the sealing nail body 12, thereby forming a secure connection between the elastic sealing plug 11, the sealing plug body, and the cover body 2. Of course, when the fifth portion 114 is inserted into the snap-in groove 1211, it can also enhance the sealing between the elastic sealing plug 11 and the sealing nail body 12, thereby reducing leakage.

[0050] Furthermore, if Figure 3 As shown, along the direction from the top surface to the bottom surface of the battery top cover, the fifth part 114 and the raised part 111 are staggered, thereby avoiding the phenomenon that the elastic sealing plug 11 has a large local thickness and it is difficult to pull out the sealing nail body 12, thereby ensuring the implementation of repeated plugging and unplugging operations.

[0051] Optionally, the end of the sealing nail body 12 located on the bottom side of the battery cover is provided with a curved end surface, thereby facilitating the insertion of the sealing nail body 12 and avoiding sharp edges that could easily scratch the elastic sealing plug 11. Specifically, in this embodiment, the end of the third portion 121 located on the bottom side of the battery cover is provided with a hemispherical end surface. Of course, in some other embodiments, a shape with a curved surface, such as a truncated cone or a cone, may also be provided. As long as a curved end surface is formed on the contact surface between the sealing nail body 12 and the elastic sealing plug 11, it falls within the scope of protection of the present utility model.

[0052] The present invention also provides a battery top cover, including a cover body 2 and the above-mentioned sealing nail assembly. Specifically, the cover body 2 has an injection hole 21, and the sealing nail assembly is detachably and sealedly inserted in the injection hole 21. Through the above-mentioned sealing nail assembly, the injection hole 21 can be well sealed to achieve better sealing stability, and the sealing nail assembly can fit well on the inner wall of the injection hole 21 to achieve sealing, thereby avoiding the welding sealing method, and is not prone to leakage due to poor processing quality or welding quality, thereby improving the yield rate of the battery. In addition, the sealing nail assembly has good reusability and can be easily pulled out and re-sealed, thereby realizing the recovery and re-injection of the electrolyte. At the same time, detectability can be easily achieved through the height difference between the sealing nail body 12 and the battery cover, thereby facilitating the detection of the yield rate.

[0053] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Sealing nail assembly, characterized in that, include: An elastic sealing plug (11) capable of being inserted into the liquid injection hole (21) of the battery top cover, wherein a mounting hole is formed in the elastic sealing plug (11); A sealing nail body (12), the sealing nail body (12) is inserted into the elastic sealing plug (11) through the mounting hole, the sealing nail body (12) can abut against the inner wall of the mounting hole, so that the elastic sealing plug (11) is sealed against the inner wall of the injection hole (21), and, The outer wall of the elastic sealing plug (11) is provided with a protrusion (111), and the inner wall of the liquid injection hole (21) is provided with a recessed groove (211). The protrusion (111) can be inserted into the recessed groove (211), so that the sealing nail assembly is limitedly arranged in the liquid injection hole (21) along the direction from the top surface to the bottom surface of the battery top cover.

2. The sealing nail assembly according to claim 1, characterized in that The mounting hole is a blind hole, and the sealing nail body (12) is inserted into the mounting hole in a direction from the top surface to the bottom surface of the battery top cover; or, The mounting hole is a through hole, and the sealing nail body (12) is sealingly inserted into the mounting hole along the direction from the top surface to the bottom surface of the battery top cover.

3. The sealing nail assembly according to claim 2, characterized in that: The vertical cross-sectional shape of the protrusion (111) is at least one of a semicircular shape, a semi-elliptical shape, and a partial arc shape, and the protrusion (111) is configured to be deformed and compressed to a diameter not greater than the inner diameter of the injection hole (21) when under pressure, so that the protrusion (111) can slide into the injection hole (21).

4. The sealing nail assembly according to claim 3, characterized in that The recessed groove (211) has a vertical cross-sectional shape corresponding to the raised portion (111), and the inner wall of the recessed groove (211) can be fitted and sealed with the outer wall of the raised portion (111).

5. The sealing nail assembly according to claim 2, characterized in that: The elastic sealing plug (11) includes a first portion (112) and a second portion (113), wherein the first portion (112) is inserted into the liquid injection hole (21) and is provided with the mounting hole, one end of the first portion (112) passes through the liquid injection hole (21) and is located at the bottom side of the battery top cover, and the second portion (113) is connected to the other end of the first portion (112) and is located at the top side of the battery top cover, and The sealing nail body (12) includes a third part (121) and a fourth part (122), the third part (121) is inserted into the mounting hole, the fourth part (122) is connected to one end of the third part (121) and is located on the top side of the battery top cover, and the second part (113) is sealed and clamped between the fourth part (122) and the battery top cover.

6. The sealing nail assembly according to claim 5, characterized in that: A step structure (1131) is formed between the second portion (113) and the fourth portion (122), and the step structure (1131) is used to facilitate the extraction of the sealing nail assembly.

7. The sealing nail assembly according to claim 5, characterized in that: The elastic sealing plug (11) further includes a fifth part (114), the fifth part (114) being connected to one end of the first part (112) located on the bottom side of the battery top cover, and the third part (121) being provided with a snap-fitting groove (1211) at one end located on the bottom side of the battery top cover, and the fifth part (114) being capable of being limitedly inserted into the snap-fitting groove (1211).

8. The sealing nail assembly according to claim 7, characterized in that Along the direction from the top surface to the bottom surface of the battery top cover, the fifth portion (114) and the raised portion (111) are staggered.

9. The sealing nail assembly according to claim 6, characterized in that: One end of the third portion (121) located at the bottom side of the battery top cover is provided with an arc-shaped end surface.

10. Battery cover, characterized in that, The invention comprises a cover plate body (2) and a sealing nail assembly as described in any one of claims 1 to 9, wherein the cover plate body (2) has a liquid injection hole (21), and the sealing nail assembly is detachably and sealingly inserted in the liquid injection hole (21).

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