Sealing nail and battery

Abstract

The utility model belongs to the technical field of battery structures, and discloses a sealing nail and a battery. The sealing nail comprises a sealing nail body and a soft rubber sealing body, the sealing nail body comprises a nail tail part and a nail shaft part, the nail shaft part is fixedly connected to the nail tail part, and the nail shaft part can penetrate through a liquid injection hole of a battery cover plate; the soft rubber sealing body is fixedly connected to the nail shaft part, and the soft rubber sealing body is further provided with a sealing flange; when the sealing nail is installed on the battery cover plate, the sealing nail is welded to the battery cover plate, the tail of the nail is located at one end of the liquid injection hole, and the sealing flange abuts against the battery cover plate in a sealed mode and is located at the other end of the liquid injection hole. The battery cover plate is clamped between the nail tail and the sealing flange, so that the sealing flange can well seal the liquid injection hole, electrolyte can be well prevented from entering the liquid injection hole and corroding the welding position of the sealing nail and the battery cover plate, separation and liquid leakage between the sealing nail and the battery cover plate can be well prevented, and the service life of the battery cover plate is prolonged. And control over the welding position is facilitated, and the welding yield is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, and particularly relates to a sealing nail and a battery. Background Art

[0002] The main function of the sealing nail is to ensure the sealing performance of the battery housing, prevent the leakage of gas or liquid inside the battery, and at the same time 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 service life of the battery.

[0003] After the electrolyte injection is completed, items such as rubber stoppers are temporarily used to preliminarily seal the injection hole to prevent electrolyte leakage. Next, the sealing nail is installed at the corresponding hole position on the battery cover plate and fixed by welding or other means. This process usually uses high-precision and high-efficiency welding technologies such as laser welding, and has very high requirements for the processing accuracy of the sealing nail and the injection hole. When there are large dimensional fluctuations between the injection hole sealing nail and the injection hole itself, it will lead to a large weld gap between the sealing nail and the injection hole, and thus there may be a welding hole phenomenon, affecting the sealing performance.

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

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

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The sealing nail includes a sealing nail body and a soft rubber sealing body, wherein:

[0008] The sealing nail body includes a nail tail part and a nail shaft part, the nail shaft part is fixedly connected to the nail tail part, and the nail shaft part can pass through the injection hole of the battery cover plate;

[0009] The soft rubber sealing body is fixedly connected to the nail shaft part, and the soft rubber sealing body also has a sealing flange;

[0010] The sealing nail is configured such that when the sealing nail is installed on the battery cover plate, the sealing nail is welded to the battery cover plate and the nail tail part is located at one end of the injection hole, and the sealing flange is sealingly abutted against the battery cover plate and is located at the other end of the injection hole.

[0011] Preferably, the soft rubber sealing body has a mounting hole, and the nail shaft part is inserted into the mounting hole and fixedly connected to the soft rubber sealing body.

[0012] Preferably, the sealing flange is disposed on the outer peripheral surface of the soft rubber seal body and is located at an end of the soft rubber seal body away from the nail tail.

[0013] Preferably, the sealing flange is continuously arranged circumferentially around the axis of the nail shaft portion on the outer peripheral surface of the soft rubber seal body, and the sealing flange is configured to have a first state and a second state. In the first state, it can be compressed and deformed to pass through the liquid injection hole, and in the second state, it can cooperate with the nail tail to clamp the battery cover plate.

[0014] Preferably, an interference fit is provided between the outer peripheral surface of the soft rubber seal body and the inner wall surface of the liquid injection hole.

[0015] Preferably, a recess is further provided on the top surface of the battery cover plate, and the liquid injection hole is provided in the recess. When the sealing nail is installed on the battery cover plate, the nail tail is embedded in the recess and is flush with the top surface of the battery cover plate.

[0016] Preferably, when the sealing nail is installed on the battery cover plate, the nail tail is limited and abutted against the side wall of the recess.

[0017] Preferably, a welding portion is provided on the nail tail, and the welding portion is used for welding connection with the battery cover plate to form a seal.

[0018] Preferably, the soft rubber seal body is made of fluororubber.

[0019] The beneficial effects of the sealing nail provided by the present invention: By clamping the battery cover plate between the nail tail and the sealing flange, not only can the firmness of the sealing nail installed on the battery cover plate be enhanced, but also the sealing flange can better seal the liquid injection hole. Compared with the prior art, it can better prevent the electrolyte from entering the liquid injection hole and corroding the welding part between the sealing nail and the battery cover plate, can better prevent the separation and liquid leakage between the sealing nail and the battery cover plate, and the sealing flange plays a riveting effect, enabling the sealing nail to be firmly arranged in the liquid injection hole before welding, and also facilitating the control of the welding position, which is beneficial to improving the yield rate of the welding connection between the sealing nail and the battery cover plate.

[0020] Another object of the present invention is to provide a battery with better sealing performance to ensure the production yield rate.

[0021] To achieve this purpose, the present invention adopts the following technical solutions:

[0022] A battery, comprising a battery cover plate and the above-mentioned sealing nail, wherein a liquid injection hole is provided on the battery cover plate, and the sealing nail is sealingly installed in the liquid injection hole.

[0023] The beneficial effects of the battery provided by the present utility model: By clamping the battery cover plate between the nail tail and the sealing flange, the firmness of the sealing nail installed on the battery cover plate can be enhanced, and the sealing flange can better seal the liquid injection hole. Compared with the prior art, it can better prevent the electrolyte from entering the liquid injection hole and corroding the welding part between the sealing nail and the battery cover plate, and can better prevent the separation and liquid leakage between the sealing nail and the battery cover plate. Moreover, the sealing flange plays the role of riveting, enabling the sealing nail to be firmly set in the liquid injection hole before welding, and also facilitating the control of the welding position, which is beneficial to improving the yield rate of the welded connection between the sealing nail and the battery cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of the sealing nail provided by the present utility model;

[0025] Figure 2 is a perspective view of the battery cover plate connected to the sealing nail in the present utility model;

[0026] Figure 3 is a top view of the assembly of the sealing nail and the battery cover plate provided by the present utility model;

[0027] Figure 4 is along Figure 3 the cross-sectional view in the A-A direction in

[0028] Figure 5 is Figure 4 the partial enlarged view at B in

[0029] Figure 6 is the partial structure explosion diagram of the battery provided by the present utility model

[0030] Figure 7 is the first perspective assembly diagram of the partial structure of the battery provided by the present utility model;

[0031] Figure 8 is the second perspective assembly diagram of the partial structure of the battery provided by the present utility model.

[0032] In the figure:

[0033] 1. Riveting aluminum block; 2. Positive upper plastic; 3. Battery cover plate; 31. Liquid injection hole; 32. Concave part; 4. Sealing ring; 5. Positive electrode column; 6. Positive lower plastic; 7. Explosion-proof sheet; 8. Negative lower plastic; 9. Negative electrode column; 10. Negative upper plastic; 11. Explosion-proof sheet film; 12. Sealing nail; 121. Sealing nail body; 1211. Nail tail; 1212. Nail shaft part; 122. Soft rubber sealing body; 1221. Sealing flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", and "left" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] The following will introduce the sealing nail 12 and the battery provided by the present utility model according to the attached Figure 1 to the attached Figure 8 As shown, in this embodiment, the sealing nail 12 can be installed on the liquid injection hole 31 of the battery cover plate 3 to seal the liquid injection hole 31 after the liquid injection is completed, ensuring that no abnormal phenomena such as leakage occur on both sides of the battery cover plate 3 through the liquid injection hole 31.

[0039] As Figures 1 to 3 shown, in this embodiment, the sealing nail 12 can be installed on the liquid injection hole 31 of the battery cover plate 3 to seal the liquid injection hole 31 after the liquid injection is completed, ensuring that no abnormal phenomena such as leakage occur on both sides of the battery cover plate 3 through the liquid injection hole 31.

[0040] In this embodiment, as Figure 1 , Figure 4 ,Figure 5 As shown, the sealing nail 12 includes a sealing nail body 121 and a soft rubber sealing body 122. The soft rubber sealing body 122 is fixedly connected to the sealing nail body 121, and the two cooperate with each other, enabling the sealing nail 12 to be firmly installed in the liquid injection hole 31 of the battery cover plate 3 and achieving the sealing of the liquid injection hole 31.

[0041] Specifically, the sealing nail body 121 includes a nail tail part 1211 and a nail shaft part 1212. The nail shaft part 1212 is fixedly connected to the nail tail part 1211, and the nail shaft part 1212 can pass through the liquid injection hole 31 of the battery cover plate 3. The soft rubber sealing body 122 is fixedly connected to the nail shaft part 1212, and the soft rubber sealing body 122 also has a sealing flange 1221. When the sealing nail 12 is installed on the battery cover plate 3, the sealing nail 12 is welded to the battery cover plate 3 and the nail tail part 1211 is located at one end of the liquid injection hole 31, and the sealing flange 1221 is in sealing contact with the battery cover plate 3 and is located at the other end of the liquid injection hole 31, thereby clamping the battery cover plate 3 between the nail tail part 1211 and the sealing flange 1221.

[0042] By clamping the battery cover plate 3 between the nail tail part 1211 and the sealing flange 1221, not only can the firmness of the installation of the sealing nail 12 on the battery cover plate 3 be enhanced, but also the sealing flange 1221 can better seal the liquid injection hole 31. Compared with the prior art, it can better prevent the electrolyte from entering the liquid injection hole 31 and corroding the welding part between the sealing nail 12 and the battery cover plate 3, can better prevent the separation and liquid leakage between the sealing nail 12 and the battery cover plate 3, and the sealing flange 1221 plays a riveting effect, enabling the sealing nail 12 to be firmly set in the liquid injection hole 31 before welding, and also facilitating the control of the welding position, which is beneficial to improving the qualified rate of the welding connection between the sealing nail 12 and the battery cover plate 3. Preferably, an interference fit is provided between the outer peripheral surface of the soft rubber sealing body 122 and the inner wall surface of the liquid injection hole 31 to facilitate riveting and reduce the requirements for the machining accuracy of the sealing nail 12 and the liquid injection hole 31.

[0043] Specifically, in this embodiment, the soft rubber sealing body 122 has an installation hole, and the nail shaft part 1212 can be inserted into the installation hole along its axis and fixedly connected to the soft rubber sealing body 122 by means such as gluing. The sealing flange 1221 is provided on the outer peripheral surface of the soft rubber sealing body 122 and is located at the end of the soft rubber sealing body 122 away from the nail tail part 1211. In this way, when the sealing nail 12 passes through the liquid injection hole 31, the sealing flange 1221 can be located at the other end of the liquid injection hole 31 and can abut against the bottom surface of the battery cover plate 3 to seal the liquid injection hole 31, and cooperate with the nail tail part 1211 to form a clamping and fixing effect on the battery cover plate 3.

[0044] More specifically, as Figure 1 、 Figure 5As shown, the sealing flange 1221 is continuously arranged circumferentially around the axis of the nail shaft portion 1212 on the outer peripheral surface of the soft rubber sealing body 122, so as to ensure good sealing of the liquid injection hole 31. Moreover, the sealing flange 1221 has a first state and a second state. In the first state, it can be compressed and deformed so that its own diameter is smaller than the diameter of the liquid injection hole 31, for the convenience of passing through the liquid injection hole 31 along the direction from the top surface to the bottom surface of the battery cover plate 3. In the second state, it restores its own diameter, and its own diameter is larger than the diameter of the liquid injection hole 31, so that the sealing flange 1221 can abut against the bottom surface of the battery cover plate 3 to seal the liquid injection hole 31, and can cooperate with the nail tail portion 1211 to clamp the battery cover plate 3.

[0045] Optionally, in this embodiment, the soft rubber sealing body 122 is made of fluororubber to achieve the effects of sealing and deformation. Of course, in some other embodiments, other materials with deformation and sealing functions can also be used to make the soft rubber sealing body 122, and the present utility model does not make specific limitations thereon.

[0046] Preferably, the nail tail portion 1211 is provided with a welding portion, and the welding portion is used for welding connection with the battery cover plate 3 to form a seal. In this way, there is both a sealed weld and a sealed abutment between the sealing nail 12 and the battery cover plate 3, so as to further prevent the leakage of the electrolyte in a double-sealing manner. At this time, the sealed abutment between the sealing flange 1221 and the bottom surface of the battery cover plate 3 can also prevent the electrolyte from entering the liquid injection hole 31, avoiding the corrosion of the weld between the welding portion and the battery cover plate 3 by the electrolyte.

[0047] As Figure 5 shown, in this embodiment, a recessed portion 32 is further provided on the top surface of the battery cover plate 3, and the liquid injection hole 31 is arranged in the recessed portion 32. When the sealing nail 12 is installed on the battery cover plate 3, the nail tail portion 1211 is embedded in the recessed portion 32 and is flush with the top surface of the battery cover plate 3. The flush setting method can reduce the size of the sealing nail 12 protruding from the battery cover plate 3, thereby avoiding interference with the installation of other parts.

[0048] Furthermore, when the sealing nail 12 is installed on the battery cover plate 3, the nail tail portion 1211 is limited and abuts against the side wall of the recessed portion 32, thereby further facilitating the positioning of the sealing nail 12 and reducing the processing precision requirements for the sealing nail 12 and the liquid injection hole 31.

[0049] As Figures 6 to 8 shown, the present utility model also provides a battery, which includes the battery cover plate 3 and the above-mentioned sealing nail 12. The battery cover plate 3 is provided with a liquid injection hole 31, and the sealing nail 12 is hermetically installed in the liquid injection hole 31 to seal the liquid injection hole 31.

[0050] By clamping the battery cover plate 3 between the nail tail portion 1211 and the sealing flange 1221, not only can the firmness of the installation of the sealing nail 12 on the battery cover plate 3 be enhanced, but also the sealing flange 1221 can better seal the liquid injection hole 31. Compared with the prior art, it can better prevent the electrolyte from entering the liquid injection hole 31 and corroding the welding part between the sealing nail 12 and the battery cover plate 3, can better prevent the separation and liquid leakage between the sealing nail 12 and the battery cover plate 3, and the sealing flange 1221 plays the role of riveting, so that the sealing nail 12 can be firmly arranged in the liquid injection hole 31 before welding, which also facilitates the control of the welding position and is beneficial to improving the yield rate of the welded connection between the sealing nail 12 and the battery cover plate 3.

[0051] Specifically, as Figure 6 shown, in this embodiment, the battery further includes an explosion-proof film sticker 11, a negative upper plastic 10, a negative terminal 9, a negative lower plastic 8, an explosion-proof sheet 7, a positive lower plastic 6, a positive terminal 5, a sealing ring 4, a battery cover plate 3, a positive upper plastic 2, and a riveted aluminum block 1. Among them, the explosion-proof film sticker 11 serves as a protective barrier, which can effectively prevent the battery from exploding when the internal pressure is too high and ensure the use safety; the negative upper plastic 10 and the negative lower plastic 8 respectively cover the upper and lower parts of the negative electrode, playing the roles of insulation and protection to prevent the battery from short-circuiting or leaking electricity; the negative terminal 9 serves as the connection point of the negative electrode and is responsible for leading the current out of the battery interior; the explosion-proof sheet 7 works together with the explosion-proof film sticker 11 to further enhance the safety of the battery; the positive lower plastic 6 also plays the roles of insulation and protection to ensure the electrical safety of the positive electrode part; the positive terminal 5 is the connection point of the positive electrode and together with the negative terminal 9 constitutes the main circuit path of the battery; the sealing ring 4 fits tightly between the battery cover plate 3 and the battery case, effectively preventing the leakage of the electrolyte and the intrusion of external impurities; the battery cover plate 3 serves as the top protection structure of the battery to protect the internal components of the battery from external damage; the positive upper plastic 2 covers the positive electrode to provide additional insulation and protection; and the riveted aluminum block 1 firmly connects each component inside the battery through the riveting process to ensure the mechanical strength of the battery and the stability of current transmission. These components work together to enable the battery to operate safely, efficiently, and reliably.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Sealing nail, characterized in that, It includes a sealing nail body (121) and a soft rubber sealing body (122), wherein: The sealing nail body (121) includes a nail tail part (1211) and a nail shaft part (1212), the nail shaft part (1212) is fixedly connected to the nail tail part (1211), and the nail shaft part (1212) can penetrate through the liquid injection hole (31) of the battery cover plate (3); The soft rubber sealing body (122) is fixedly connected to the nail shaft part (1212), and the soft rubber sealing body (122) also has a sealing flange (1221); The sealing nail (12) is configured such that when the sealing nail (12) is installed on the battery cover plate (3), the sealing nail (12) is welded to the battery cover plate (3) and the nail tail part (1211) is located at one end of the liquid injection hole (31), and the sealing flange (1221) is in sealing abutment with the battery cover plate (3) and is located at the other end of the liquid injection hole (31).

2. The sealing nail according to claim 1, characterized in that The soft rubber sealing body (122) has a mounting hole, and the nail shaft part (1212) is inserted into the mounting hole and fixedly connected to the soft rubber sealing body (122).

3. The sealing nail according to claim 2, characterized in that The sealing flange (1221) is provided on the outer peripheral surface of the soft rubber sealing body (122) and is located at the end of the soft rubber sealing body (122) away from the nail tail part (1211).

4. The sealing nail according to claim 3, characterized in that The sealing flange (1221) is continuously arranged circumferentially around the axis of the nail shaft part (1212) on the outer peripheral surface of the soft rubber sealing body (122), and the sealing flange (1221) is configured to have a first state and a second state. In the first state, it can be compressed and deformed to pass through the liquid injection hole (31), and in the second state, it can cooperate with the nail tail part (1211) to clamp the battery cover plate (3).

5. The sealing nail according to claim 4, characterized in that An interference fit is provided between the outer peripheral surface of the soft rubber sealing body (122) and the inner wall surface of the liquid injection hole (31).

6. The sealing nail according to claim 1, characterized in that A recessed part (32) is further provided on the top surface of the battery cover plate (3), the liquid injection hole (31) is provided in the recessed part (32), and when the sealing nail (12) is installed on the battery cover plate (3), the nail tail part (1211) is embedded in the recessed part (32) and is flush with the top surface of the battery cover plate (3).

7. The sealing nail according to claim 6, characterized in that When the sealing nail (12) is installed on the battery cover plate (3), the nail tail part (1211) is in limit abutment with the side wall of the recessed part (32).

8. The sealing nail according to claim 1, characterized in that The nail tail part (1211) is provided with a welding part, and the welding part is used for welding connection with the battery cover plate (3) and forming a seal.

9. The sealing nail according to any one of claims 1-8, characterized in that the soft rubber sealing body (122) is made of fluororubber.

10. A battery, characterized in that, Comprising a battery cover plate (3) and a sealing nail (12) according to any one of claims 1-9, a liquid injection hole (31) is provided on the battery cover plate (3), and the sealing nail (12) is sealingly installed in the liquid injection hole (31).

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