Sealing nail and battery cover plate

Abstract

The utility model belongs to the technical field of battery structures, and discloses a sealing nail and a battery cover plate. The sealing nail comprises an elastic sealing plug, an elastic piece and a sealing nail body, the sealing nail body can be inserted into the elastic sealing plug and abut against the elastic piece, so that the elastic piece extends outwards, and therefore the elastic sealing plug abuts against the inner wall of the liquid injection hole in a sealed mode to seal the liquid injection hole. And an expansion end larger than the liquid injection hole is formed to prevent the sealing nail and the liquid injection hole from loosening or separating. By arranging the sealing nail, the liquid injection hole can be well sealed, the sealing stability is better, and the elastic sealing plug can be well attached to the inner wall of the liquid injection hole to achieve sealing, so that the welding sealing mode is avoided, the leakage phenomenon caused by poor machining quality or welding quality is not prone to occurring, and the sealing effect is good. And the yield of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to a sealing nail and a battery 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 and a battery cover to solve the above technical problems. Utility Model Content

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

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

[0007] Sealing nails, including:

[0008] an elastic sealing plug, the elastic sealing plug being capable of being inserted into the liquid injection hole of the cover body, and having an accommodating cavity formed therein, an insertion port being provided at one end of the elastic sealing plug located on the top side of the cover body, the insertion port being in communication with the accommodating cavity, and a portion of the accommodating cavity being located on the bottom side of the cover body;

[0009] a spring piece, the spring piece being arranged in the accommodating cavity and located at the bottom side of the cover body;

[0010] The sealing nail body is inserted into the elastic sealing plug through the insertion port, and the sealing nail body can abut against the spring sheet so that the end of the elastic sealing plug located on the bottom side of the cover body expands to no less than the injection hole, and the elastic sealing plug is sealed against the inner wall of the injection hole.

[0011] Preferably, along the direction from the top side of the cover body to the bottom side of the cover body, the elastic sealing plug includes an open end, a middle section and an enlarged end connected in sequence, the accommodating cavity extends within the open end, the middle section and the enlarged end, and the insertion port is arranged at the open end.

[0012] Preferably, the spring sheet is arranged in the enlarged end, and when the sealing nail body is inserted into the accommodating cavity and abuts against the spring sheet, the spring sheet can abut against the inner wall of the enlarged end and make the enlarged end expand to no less than the injection hole.

[0013] Preferably, at least two of the spring pieces are accommodated in the expanded end, and the at least two spring pieces are stacked.

[0014] Preferably, the vertical cross-section of the elastic piece is U-shaped, V-shaped or W-shaped.

[0015] Preferably, when the sealing nail body is inserted into the middle section, the middle section is sealed against between the sealing nail body and the inner wall of the liquid injection hole.

[0016] Preferably, the end face of the opening end is provided with a sealing groove, and the sealing nail body includes a sealing protrusion, which can be inserted into the sealing groove to seal between the end face of the opening end and the sealing nail body.

[0017] Preferably, when the expanded end is expanded, the opening end can be arranged in sealing contact with the top surface of the cover body.

[0018] The sealing pin provided by the present invention has the following beneficial effects: by providing the aforementioned sealing pin, the liquid injection hole can be effectively sealed with excellent sealing stability. Furthermore, the elastic sealing plug can be well-fitted to the inner wall of the liquid injection hole to achieve a seal, thereby avoiding the need for welding sealing, making it less susceptible to leakage caused by poor processing or welding quality, and improving the battery's yield rate. Furthermore, the sealing pin also has detectability, achieved by the height difference between the sealing pin and the cover plate body. The sealing effect can also be adjusted by adjusting the spring structure, hardness, and thickness, the elastic sealing plug material and structure, and the sealing pin body structure.

[0019] Another object of the present invention is to provide a battery cover with better sealing performance to ensure production yield.

[0020] To achieve this purpose, the present invention adopts the following technical solutions:

[0021] The battery cover comprises a cover body and the above-mentioned sealing nail, wherein the cover body has a liquid injection hole, and the sealing nail is sealingly penetrated through the liquid injection hole.

[0022] Preferably, the battery cover also includes a lower plastic, which is fixedly connected to the cover body. The lower plastic includes an abutment portion, and along the direction from the bottom side of the cover body to the top side of the cover body, the abutment portion can abut against the end face of the enlarged end of the sealing nail.

[0023] The battery cover provided by this utility model has the following beneficial effects: it can effectively seal the liquid injection hole with excellent sealing stability, and the sealing pin can be well attached to the inner wall of the liquid injection hole to achieve a seal, thereby avoiding the need for welding sealing, and is less likely to cause leakage due to poor processing or welding quality, thereby improving the battery yield rate. In addition, the battery cover also has detectability, which is achieved by the height difference between the sealing pin and the cover body. The sealing effect can also be adjusted by adjusting the spring structure, hardness, thickness, elastic sealing plug material and structure, and the sealing pin body structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a top view of the battery cover provided by the present invention;

[0025] Figure 2 It is along Figure 1 Cross-section view in the AA direction;

[0026] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle;

[0027] Figure 4 It is a three-dimensional diagram of the battery cover provided by the utility model;

[0028] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle.

[0029] In the picture:

[0030] 11. Elastic sealing plug; 111. Open end; 1111. Sealing groove; 112. Middle section; 113. Enlarged end;

[0031] 12. Shrapnel;

[0032] 13. Sealing nail body; 131. Nail head; 132. Nail tail; 1321. Sealing protrusion;

[0033] 2. Cover plate body; 21. Liquid injection hole; 22. Card slot;

[0034] 3. Lower plastic; 31. Abutment portion; 32. Annular hot-melt undercut. 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 5 The present invention provides a sealing nail and a battery cover. The sealing nail can be installed on the cover body 2 of the battery cover to seal the injection hole 21 and solve the sealing problem caused by the large weld gap between the sealing nail and the injection hole 21 in the prior art.

[0040] like Figures 1 to 3As shown, in this embodiment, the sealing pin includes an elastic sealing plug 11, a spring 12 and a sealing pin body 13. Among them, along the direction from the top side of the cover body 2 to the bottom side of the cover body 2, the elastic sealing plug 11 can be passed through the injection hole 21 of the cover body 2. A accommodating cavity is formed inside the elastic sealing plug 11, and parts of the spring 12 and the sealing pin body 13 are arranged in the accommodating cavity. One end of the elastic sealing plug 11 is located on the top side of the cover body 2 and is provided with an insertion port, which is connected to the accommodating cavity. Through the insertion port, the spring 12 can be loaded into the accommodating cavity, and the sealing pin body 13 can be inserted into the accommodating cavity.

[0041] The other end of the elastic sealing plug 11 is located on the bottom side of the cover body 2, and part of the accommodating cavity is also located on the bottom side of the cover body 2. After the spring piece 12 is installed in the accommodating cavity, it can also be moved to the bottom side of the cover body 2. When the sealing nail body 13 is inserted into the accommodating cavity, part of the outer wall of the elastic sealing plug 11 can be sealed against the inner wall of the injection hole 21, thereby blocking the injection hole 21. At the same time, the end of the sealing nail body 13 can abut against the spring piece 12, so that the spring piece 12 is deformed and abuts against the inner wall of the elastic sealing plug 11, so that part of the elastic sealing plug 11 expands to a size not less than the size of the injection hole 21, which prevents the sealing nail from moving in the direction from the bottom side of the cover body 2 to the top side of the cover body 2, thereby ensuring the sealing stability of the sealing nail.

[0042] During installation, first, insert the elastic sealing plug 11 into the injection hole 21 of the cover body 2, ensuring that at least part of the accommodating cavity is located on the bottom side of the cover body 2. Subsequently, place the spring 12 on the bottom side of the cover body 2 in the accommodating cavity. Finally, insert the sealing nail body 13 into the elastic sealing plug 11 through the insertion port and make it abut against the spring 12. This action will cause the elastic sealing plug 11 to seal against the inner wall of the injection hole 21, achieving a sealing effect. At the same time, the end of the elastic sealing plug 11 located on the bottom side of the cover body 2 expands until its size is no smaller than the injection hole 21, thereby preventing the elastic sealing plug 11 or the sealing nail body 13 from loosening, thereby ensuring the sealing stability of the sealing nail.

[0043] By installing the aforementioned sealing pin, the liquid injection hole 21 can be effectively sealed with excellent sealing stability. Furthermore, the elastic sealing plug 11 can be well adhered to the inner wall of the liquid injection hole 21 to achieve a seal, thereby avoiding the need for welding sealing. This makes it less likely to cause leakage due to poor processing or welding quality, thereby improving the battery's yield rate. Furthermore, the sealing pin also has detectability, achieved by the height difference between the sealing pin and the cover plate body 2. The sealing effect can also be adjusted by adjusting the structure, hardness, and thickness of the spring 12, the material and structure of the elastic sealing plug 11, and the structure of the sealing pin body 13.

[0044] Specifically, if Figure 3As shown, from the top to the bottom of the cover body 2, the elastic sealing plug 11 includes an open end 111, an intermediate section 112, and an enlarged end 113, which are connected in sequence. The intermediate section 112 is connected between the open end 111 and the enlarged end 113. A receiving cavity extends within the open end 111, the intermediate section 112, and the enlarged end 113, with an insertion port provided at the open end 111. Through the insertion port, the sealing pin body 13 can pass through the open end 111 and the intermediate section 112 until it reaches the enlarged end 113 and abuts against the spring piece 12.

[0045] Continue to refer to Figure 3 As shown, in this embodiment, a spring 12 is disposed within the expanded end 113. When the sealing nail body 13 is inserted into the accommodating cavity and abuts the spring 12, the spring 12 abuts the inner wall of the expanded end 113, causing the expanded end 113 to expand to a size no smaller than the injection hole 21, thereby preventing the sealing nail from being separated from the injection hole 21. The sealing nail body 13 also includes a nail head 131 and a nail tail 132. The nail head 131 can be inserted into the open end 111 and abut against the spring 12. When the nail head 131 is inserted into the middle section 112, the middle section 112 seals and abuts between the sealing nail body 13 and the inner wall of the injection hole 21, thereby sealing the injection hole 21. Preferably, the nail head 131 is hemispherical in shape so that it expands outward when abutting against the spring 12. The nail tail portion 132 can abut against the end surface of the opening end 111 , so that the cover plate body 2 and the sealing nail are fixed together through the nail tail portion 132 and the enlarged end 113 .

[0046] Optionally, in some embodiments, the expanded end 113 accommodates at least two spring pieces 12, and the at least two spring pieces 12 are stacked, thereby generating sufficient external tension to enable the expanded end 113 to expand to a size no smaller than the injection hole 21, thereby securing the cover body 2 between the nail tail 132 and the expanded end 113. Specifically, the vertical cross-section of the spring piece 12 can be U-shaped, V-shaped, or W-shaped, all of which are capable of generating external tension and fall within the scope of protection of the present invention.

[0047] Preferably, the end surface of the open end 111 is provided with a sealing groove 1111, and the sealing nail body 13 includes a sealing protrusion 1321 that can be inserted into the sealing groove 1111 to seal the end surface of the open end 111 and the sealing nail body 13. By controlling the thickness of the cover body 2 and the distance between the nail tail 132 and the expanded end 113, the sealing protrusion 1321 can be inserted into the sealing groove 1111 when the expanded end 113 is expanded, thereby allowing the open end 111 to be sealed and abutted against the top surface of the cover body 2.

[0048] The present invention also provides a battery cover, which includes a cover body 2 and the above-mentioned sealing nail. The cover body 2 has an injection hole 21, and the sealing nail is sealed and penetrated through the injection hole 21. The battery cover can well seal the injection hole 21 and has better sealing stability, and the sealing nail 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 battery cover also has detectability, and detectability is achieved through the height difference between the sealing nail and the cover body 2. The sealing effect can also be adjusted by the structure, hardness, and thickness of the spring 12, the material and structure of the elastic sealing plug 11, and the structure of the sealing nail body 13.

[0049] Preferably, if Figures 3 to 5 As shown, the battery cover also includes a lower plastic member 3, which is fixedly connected to the cover body 2. The lower plastic member 3 includes an abutment portion 31. Along the direction from the bottom side of the cover body 2 to the top side of the cover body 2, the abutment portion 31 can abut the end surface of the enlarged end 113 of the sealing pin. When the sealing pin body 13 is inserted into the elastic sealing plug 11, the pin head 131 abuts the spring 12 and the elastic sealing plug 11 against the abutment portion 31, thereby allowing the enlarged end 113 to expand.

[0050] In this embodiment, the lower plastic 3 is also provided with an annular hot-melt undercut 32, and the bottom surface of the cover body 2 is provided with a card groove 22. The annular hot-melt undercut 32 can be embedded in the card groove 22, thereby fixing the lower plastic 3 and the cover body 2 to be fixedly connected, so that the spring piece 12 and the elastic sealing plug 11 can abut between the nail head 131 and the abutting portion 31.

[0051] 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, characterized in that, include: An elastic sealing plug (11), the elastic sealing plug (11) being capable of being inserted into the liquid injection hole (21) of the cover body (2), and a receiving cavity being formed in the elastic sealing plug (11), an insertion port being provided at one end of the elastic sealing plug (11) located on the top side of the cover body (2), the insertion port being communicated with the receiving cavity, and a portion of the receiving cavity being located on the bottom side of the cover body (2); a spring piece (12), the spring piece (12) being arranged in the accommodating cavity and located on the bottom side of the cover body (2); A sealing nail body (13), wherein the sealing nail body (13) is inserted into the elastic sealing plug (11) through the insertion port, and the sealing nail body (13) can abut against the spring (12), so that the end of the elastic sealing plug (11) located on the bottom side of the cover body (2) expands to no less than the injection hole (21), and the elastic sealing plug (11) is sealed against the inner wall of the injection hole (21).

2. The sealing nail according to claim 1, characterized in that: Along the direction from the top side of the cover plate body (2) to the bottom side of the cover plate body (2), the elastic sealing plug (11) includes an open end (111), a middle section (112) and an enlarged end (113) connected in sequence, the accommodating cavity is extended and arranged in the open end (111), the middle section (112) and the enlarged end (113), and the insertion port is arranged at the open end (111).

3. The sealing nail according to claim 2, characterized in that: The spring piece (12) is arranged in the enlarged end (113), and when the sealing nail body (13) is inserted into the accommodating cavity and abuts against the spring piece (12), the spring piece (12) can abut against the inner wall of the enlarged end (113) and make the enlarged end (113) enlarge to no less than the injection hole (21).

4. The sealing nail according to claim 3, characterized in that: At least two of the spring sheets (12) are accommodated in the enlarged end (113), and the at least two spring sheets (12) are stacked.

5. The sealing nail according to claim 4, characterized in that: The vertical cross-section of the spring piece (12) is U-shaped, V-shaped or W-shaped.

6. The sealing nail according to claim 2, characterized in that: When the sealing nail body (13) is inserted into the middle section (112), the middle section (112) is sealed and abutted between the sealing nail body (13) and the inner wall of the liquid injection hole (21).

7. The sealing nail according to claim 2, characterized in that: The end surface of the opening end (111) is provided with a sealing groove (1111), and the sealing nail body (13) includes a sealing protrusion (1321). The sealing protrusion (1321) can be inserted into the sealing groove (1111) to seal between the end surface of the opening end (111) and the sealing nail body (13).

8. The sealing nail according to claim 7, characterized in that: When the expanded end (113) expands, the open end (111) can be arranged in sealing contact with the top surface of the cover plate body (2).

9. Battery cover, characterized in that: The invention comprises a cover plate body (2) and a sealing nail as claimed in any one of claims 1 to 8, wherein the cover plate body (2) has a liquid injection hole (21), and the sealing nail is sealingly penetrated through the liquid injection hole (21).

10. The battery cover according to claim 9, characterized in that: The battery cover plate further comprises a lower plastic (3), the lower plastic (3) being fixedly connected to the cover plate body (2), the lower plastic (3) comprising an abutting portion (31), and the abutting portion (31) being capable of abutting against the end surface of the enlarged end (113) of the sealing pin in a direction from the bottom side of the cover plate body (2) to the top side of the cover plate body (2).

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