Press-type sealing nail and cylindrical battery

Abstract

The present application provides a press-type sealing nail, including a main body and a press-piece, the main body and the press-piece are in close contact and can slide relative to each other, the main body is in close contact with the pressing piece and has a liquid injection groove on one side, one end of the liquid injection groove extends to the opening on the surface of the main body and is connected to the inside of the battery; in the sealed state, the main body is welded and fixed to the liquid injection hole, and the other end of the liquid injection groove is enclosed in the main body and the press-piece; the pressing piece is pressed to make it slide relative to the main body, the other end of the liquid injection groove is exposed on the surface of the main body, and the sealed state is switched to the liquid injection state; the present application also provides a cylindrical battery. The present application uses the setting of the pressing piece to press the pressing piece to make it slide relative to the main body, so that the liquid injection groove previously blocked and closed by the pressing piece is exposed on the surface of the main body, and the second liquid injection can be performed through the liquid injection groove, without the need to desolder the entire press-type sealing nail, which saves time, simplifies the production steps, and improves production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, and in particular to a press-type sealing nail and a cylindrical battery. Background Art

[0002] During the manufacturing process of cylindrical batteries, electrolyte needs to be injected into the cylindrical battery through the injection port. After the first injection, the injection port needs to be sealed, and then the aging and formation processes are carried out. During the aging and formation processes, part of the electrolyte will infiltrate into the electrode. At this time, additional electrolyte can be injected to improve battery performance. Therefore, the cylindrical battery needs to be injected for the second time, and the injection port is sealed after the second injection is completed.

[0003] Nowadays, sealing pins are often used to seal the liquid injection port, and the electrolyte needs to be injected into the cylindrical battery twice separately. Since the battery has high requirements for sealing, the sealing pin needs to be welded to the liquid injection port after the first liquid injection to ensure that the electrolyte inside the battery does not leak out. However, the electrolyte needs to be injected through the liquid injection port for the second time. In this case, the sealing pin needs to be de-soldered first, and then the sealing pin is welded to the liquid injection port again after the second electrolyte injection is completed. This results in cumbersome steps when using existing sealing pins for the liquid injection process, which seriously reduces the production efficiency of cylindrical batteries and increases production costs. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present application provides a press-type sealing nail and a cylindrical battery.

[0005] A press-type sealing nail disclosed in the present application includes: a main body and a pressing piece, the main body and the pressing piece are in close contact and can slide relative to each other, a liquid injection groove is provided on one side of the main body that is in close contact with the pressing piece, one end of the liquid injection groove extends to the opening on the surface of the main body and is connected to the interior of the battery; in a sealed state, the main body is welded and fixed to the liquid injection hole, and the other end of the liquid injection groove is enclosed in the main body and the pressing piece; the pressing piece is pressed to make it slide relative to the main body, and the other end of the liquid injection groove is exposed on the surface of the main body, and the sealed state is switched to the liquid injection state.

[0006] Preferably, the main body includes an injection column and a sealing ring, the pressing piece is movably sleeved outside the injection column, the sealing ring is movably sleeved outside the pressing piece, the injection groove is opened along the axial direction of the injection column on a side of the injection column close to the pressing piece, and one end of the injection groove is opened at the bottom of the injection column; in the sealed state, the sealing ring is welded and fixed to the injection hole, and the other end of the injection groove is enclosed in the injection column and the pressing piece; in the injection state, the other end of the injection groove is exposed on the surface of the injection column.

[0007] Preferably, a limiting column is provided on the surface of the pressing piece, and a limiting groove is formed on the sealing ring corresponding to the position of the limiting column; in the sealed state, the limiting column is located at the top of the limiting groove; in the liquid injection state, the limiting column is located at the bottom of the limiting groove.

[0008] Preferably, the limiting groove is an arc-shaped groove.

[0009] Preferably, the sliding surface between the main body and the pressing member is rough.

[0010] Preferably, the end surface of the main body and the end surface of the pressing member are flush.

[0011] Preferably, a sealing rubber ring is sleeved on the surface of the pressing piece.

[0012] The present application also provides a cylindrical battery, including a battery body and a press-type sealing nail.

[0013] Preferably, a liquid injection hole is opened on the end face of the battery body, and when the main body is welded and fixed to the liquid injection hole, the end face of the main body and the end face of the pressing member are flush with the end face of the battery body.

[0014] Preferably, the injection hole is a trumpet hole, and an inclined surface is provided on the outer surface of the main body corresponding to the injection hole.

[0015] The beneficial effect of the present application is that the press-type sealing nail in the present application is welded in the injection hole after the first injection to achieve the first seal, and when the second injection is needed, the pressing piece is set to press the pressing piece to make it slide relative to the main body, so that the injection groove previously blocked and closed by the pressing piece is exposed on the surface of the main body, and the second injection can be carried out through the injection groove, without the need to desolder the press-type sealing nail as a whole, saving time, simplifying the production steps, and improving production efficiency. After the second injection is completed, the pressing piece is reset, and then the main body and the pressing piece are welded and fixed to ensure the sealing effect of the final injection hole, which not only solves the problem of cumbersome secondary injection steps, but also solves the problem of low production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a press-type sealing nail in an embodiment;

[0018] Figure 2 It is a structural schematic diagram of the liquid injection column in the embodiment;

[0019] Figure 3 This is a schematic diagram of the structure of the pressing member in the embodiment;

[0020] Figure 4 is a schematic diagram of the structure of the sealing ring in the embodiment;

[0021] Figure 5 Schematic diagram of the structure of a cylindrical battery in an embodiment.

[0022] Reference numerals:

[0023] 1. Main body; 11. Liquid injection column; 111. Liquid injection groove; 12. Sealing ring; 121. Limiting groove; 122. Inclined surface; 2. Pressing piece; 21. Limiting column; 22. Sealing rubber ring; 100. Battery body; 101. Liquid injection hole. DETAILED DESCRIPTION

[0024] The following will disclose multiple embodiments of the present application with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present application. In other words, in some embodiments of the present application, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0025] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0027] In order to further understand the application content, features and effects of the present application, the following embodiments are cited and described in detail with reference to the accompanying drawings.

[0028] Embodiment 1:

[0029] Reference Figure 1-4 , Figure 1 This is a schematic diagram of the structure of the press-type sealing nail in the embodiment. Figure 2 It is a structural schematic diagram of the liquid injection column in the embodiment, Figure 3 is a schematic diagram of the structure of the pressing member in the embodiment, Figure 4 It is a schematic diagram of the structure of the sealing ring in the embodiment. The press-type sealing nail in this embodiment includes a main body 1 and a pressing member 2. The main body 1 and the pressing member 2 are in close contact and can slide relative to each other. The main body 1 is close to the pressing member 2 and has a liquid injection groove 111 on one side. One end of the liquid injection groove 111 extends to the opening on the surface of the main body 1 and is connected to the inside of the battery. In the sealed state, the main body 1 is welded and fixed to the liquid injection hole 101, and the other end of the liquid injection groove 111 is enclosed in the main body 1 and the pressing member 2. Press the pressing member 2 to make it slide relative to the main body 1, and the other end of the liquid injection groove 111 is exposed on the surface of the main body 1, and the sealed state is switched to the liquid injection state.

[0030] The press-type sealing nail in this embodiment is used to seal the injection hole of the battery. In specific application, the electrolyte is injected into the battery body 100 for the first time through the injection hole 101. After the injection, the main body 1 is welded to the injection hole 101. Since the main body 1 and the pressing part 2 are in a close contact state, the press-type sealing nail can completely seal the injection hole 101 to prevent the electrolyte in the battery body 100 from leaking. At this time, it is in a sealed state. Then the battery body 100 undergoes aging and formation processes. After the above processes are completed, the pressing member 2 is pressed to make it slide relative to the main body 1, that is, the pressing member 2 moves downward relative to the main body 1. Since in the sealed state, the other end of the injection groove 111 is located on the side of the main body 1 that is close to the pressing member 2 and is blocked and closed by the pressing member 2, as the pressing member 2 descends relative to the main body 1, the other end of the injection groove 111 is gradually exposed, and one end of the injection groove 111 is connected to the inside of the battery, so that the electrolyte can be injected for the second time from the other end of the exposed injection groove 111. At this time, it is in the injection state, and the electrolyte is injected into the battery body 100 after passing through the injection groove 111 and one end of the injection groove 111. After the second injection is completed, the pressing member 2 is raised and reset. At this time, the other end of the injection groove 111 is blocked and closed by the pressing member 2 again, and the press-type sealing nail is restored to the sealed state, and then the main body 1 and the pressing member 2 are welded and fixed, so as to achieve the final sealing effect. In this way, the press-type sealing nail in this embodiment is welded to the injection hole 101 after the first injection to achieve the first seal. When the second injection is needed, the pressing piece 2 is set to press the pressing piece 2 to make it slide relative to the main body 1, so that the injection groove 111 previously blocked and closed by the pressing piece 2 is exposed on the surface of the main body 1. The second injection can be carried out through the injection groove 111, and there is no need to desolder the press-type sealing nail as a whole, which saves time, simplifies the production steps, and improves production efficiency. After the second injection is completed, the pressing piece 2 is reset, and then the main body 1 and the pressing piece 2 are welded and fixed to ensure the sealing effect of the final injection hole 101. This not only solves the problem of cumbersome secondary injection steps, but also solves the problem of low production efficiency.

[0031] Re-reference Figure 1-4 Preferably, the main body 1 includes a liquid injection column 11 and a sealing ring 12, the pressing member 2 is movably sleeved outside the liquid injection column 11, the sealing ring 12 is movably sleeved outside the pressing member 2, the liquid injection groove 111 is opened along the axial direction of the liquid injection column 11 on a side of the liquid injection column 11 close to the pressing member 2, and one end of the liquid injection groove 111 is opened at the bottom of the liquid injection column 11. In the sealed state, the sealing ring 12 is welded and fixed to the liquid injection hole 101, and the other end of the liquid injection groove 111 is enclosed in the liquid injection column 11 and the pressing member 2. In the liquid injection state, the other end of the liquid injection groove 111 is exposed on the surface of the liquid injection column 11. In specific application, the injection column 11 in this embodiment is cylindrical, and the injection groove 111 is opened on the side wall of the injection column 11. One end of the injection groove 111 is located at the bottom end surface of the injection column 11, that is, the opening on the surface of the main body 1 is opened at the bottom of the injection column 11, one end of the injection groove 111 is connected to the opening, and the other end of the injection groove 111 is located on the side wall of the injection column 11. The pressing member 2 in this embodiment is annular, and the pressing member 2 is movably sleeved outside the injection column 11, that is, the side wall of the injection column 11 is tightly attached to the inner ring wall of the pressing member 2 and can slide relatively. In the sealed state, the pressing member 2 blocks and closes the other end of the injection groove 111 to ensure that the electrolyte inside the battery body 100 will not leak. In the injection state, the pressing piece 2 does not cover the other end of the injection groove 111, so that it is exposed on the surface of the injection column 11. That is to say, at this time, the interior of the battery body 100 is connected to the outside through the injection groove 111, so that the electrolyte can be injected into the battery body 100 from the other end of the injection groove 111. The sealing ring 12 in this embodiment is also annular, and is sleeved on the outside of the pressing piece 2, that is, the outer ring wall of the pressing piece 2 is in close contact with the inner ring wall of the sealing ring 12 and can slide relatively, and the outer ring wall of the sealing ring 12 is of a size that matches the injection hole 101. After the first injection is completed, the press-type sealing nail is placed in the injection hole 101, and the outer ring wall of the sealing ring 12 is in close contact with the hole wall of the injection hole 101, and then the sealing ring 12 is welded and fixed to the injection hole 101 by welding, so that the press-type sealing nail is tightly fixed in the injection hole 101 and the injection hole 101 is sealed. At this time, the injection groove 111 is blocked and closed by the pressing piece 2, that is, the electrolyte in the battery body 100 cannot leak through the injection groove 111, thereby ensuring the sealing.

[0032] Re-reference Figure 1-4Preferably, a limiting column 21 is provided on the surface of the pressing member 2, and a limiting groove 121 is provided on the sealing ring 12 at a position corresponding to the limiting column 21. In the sealed state, the limiting column 21 is located at the top of the limiting groove 121. In the injection state, the limiting column 21 is located at the bottom of the limiting groove 121. When applied, the limiting groove 121 in this embodiment is an arc groove, specifically a semicircular ring groove, and the heights of both ends of the limiting groove 121 are higher than the middle of the limiting groove 121, that is, the top of the limiting groove 121 is the two end positions of the limiting groove 121, and the bottom of the limiting groove 121 is the middle position of the limiting groove 121. It can be understood that when the press-type sealing nail is in the sealed state, the limiting column 21 is located at the two ends of the limiting groove 121. At this time, the height of the pressing member 2 is relatively high, and the injection groove 111 on the side wall of the injection column 11 is completely blocked. When the second injection is required, the pressing member 2 is pressed to make it descend. At this time, the limiting column 21 gradually moves from the positions at both ends of the limiting groove 121 to the middle, that is, the height gradually decreases. In other words, the pressing member 2 is still slightly rotating during the descent, but the pressing member 2 and the injection column 11 and the sealing ring 12 are kept in close contact to ensure the sealing of the sealing nail. When the limiting column 21 moves to the middle of the limiting groove 121, that is, the lowest part of the limiting groove 121, the pressing member 2 is lowered to the lowest position, that is, the height of the pressing member 2 is lower than the height of the injection column 11, so that the other end of the injection groove 111 located on the side wall of the injection column 11 is exposed, so that the electrolyte can be injected into the battery body 100 from the other end of the injection groove 111. After the second injection is completed, the pressing member 2 is raised and reset, and the injection groove 111 is blocked and closed again, and then the pressing member 2 is welded and fixed to the injection column 11 and the sealing ring 12 to complete the two injections and welding sealing processes.

[0033] Re-reference Figure 1-4 Preferably, the sliding surface between the main body 1 and the pressing member 2 has a rough surface. In specific applications, since the pressing member 2, the injection column 11 and the sealing ring 12 can slide relative to each other, and all the surfaces in contact with the three are set to have a rough surface, when no pressing force is applied to the pressing member 2, the pressing member 2, the injection column 11 and the sealing ring 12 will not slide relative to each other due to the friction force, thereby ensuring the stability of their positions and improving the sealing effect of the sealing nail. In addition, in the injection state, due to the influence of friction, the limiting column 21 can stay at the lowest point of the limiting groove 121, that is, the pressing member 2 is stable at the lowest point.

[0034] Embodiment 2:

[0035] Refer to Figure 5 , Figure 5It is a structural diagram of a cylindrical battery in an embodiment. The cylindrical battery in this embodiment includes a battery body 100 and a push-type sealing nail of an embodiment. Specifically, a liquid injection hole 101 is opened on the end face of the battery body 100. When the main body 1 is welded and fixed to the liquid injection hole 101, the end face of the main body 1 and the end face of the pressing piece 2 are flush with the end face of the battery body 100. The liquid injection hole 101 in this embodiment is a stepped inner hole, and its size and shape are adapted to the push-type sealing nail, that is, the push-type sealing nail can be completely embedded in the liquid injection hole 101. Because the end face of the main body 1 and the end face of the pressing piece 2 are flush, when the push-type sealing nail is placed in the liquid injection hole 101, its surface is flush with the end face of the battery body 100, thereby improving product quality.

[0036] Re-reference Figure 1-5 Preferably, the injection hole 101 is a trumpet hole, and an inclined surface 122 is provided on the outer surface of the main body 1 corresponding to the injection hole 101. In specific applications, the aperture of the injection hole 101 gradually decreases from the end face of the battery body 100 to the inside of the battery body 100, and is adapted to the outer surface of the main body 1, that is, the outer ring wall of the sealing ring 12. In this way, during the process of embedding the push-type sealing nail into the injection hole 101, the inclined surface 122 and the inner wall of the injection hole 101 can always be kept in close contact, and the push-type sealing nail and the injection hole 101 can be more and more closely attached, thereby improving the sealing effect of the push-type sealing nail. Furthermore, a sealing rubber ring 22 is provided on the surface of the pressing member 2. Through the setting of the sealing rubber ring 22, when the push-type sealing nail is embedded in the injection hole 101, the sealing rubber ring 22 can further improve the sealing effect of the push-type sealing nail.

[0037] In summary, the press-type sealing nail in this embodiment is welded in the injection hole after the first injection to achieve the first seal. When the second injection is needed, the pressing piece is set to press the pressing piece to make it slide relative to the main body, so that the injection groove previously blocked and closed by the pressing piece is exposed on the surface of the main body. The second injection can be carried out through the injection groove, and there is no need to desolder the press-type sealing nail as a whole, which saves time, simplifies the production steps, and improves production efficiency. After the second injection is completed, the pressing piece is reset, and then the main body and the pressing piece are welded and fixed to ensure the sealing effect of the final injection hole. This not only solves the problem of cumbersome secondary injection steps, but also solves the problem of low production efficiency.

[0038] The above is only the implementation mode of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A press-type sealing nail, characterized in that: include: A main body (1) and a pressing piece (2), the main body (1) and the pressing piece (2) are in close contact and can slide relative to each other, a liquid injection groove (111) is provided on one side of the main body (1) in close contact with the pressing piece (2), one end of the liquid injection groove (111) extends to an opening on the surface of the main body (1) and is connected to the interior of the battery; in a sealed state, the main body (1) is welded and fixed to the liquid injection hole (101), and the other end of the liquid injection groove (111) is sealed in the main body (1) and the pressing piece (2); the pressing piece (2) is pressed to slide relative to the main body (1), the other end of the liquid injection groove (111) is exposed on the surface of the main body (1), and the sealed state is switched to the liquid injection state.

2. The press-type sealing nail according to claim 1, characterized in that: The main body (1) comprises a liquid injection column (11) and a sealing ring (12); the pressing piece (2) is movably sleeved outside the liquid injection column (11); the sealing ring (12) is movably sleeved outside the pressing piece (2); the liquid injection groove (111) is opened along the axial direction of the liquid injection column (11) on a side of the liquid injection column (11) close to the pressing piece (2); one end of the liquid injection groove (111) is opened at the bottom of the liquid injection column (11); in a sealed state, the sealing ring (12) is welded and fixed to the liquid injection hole (101); the other end of the liquid injection groove (111) is sealed in the liquid injection column (11) and the pressing piece (2); in the liquid injection state, the other end of the liquid injection groove (111) is exposed on the surface of the liquid injection column (11).

3. The press-type sealing nail according to claim 2, characterized in that: A limiting column (21) is provided on the surface of the pressing member (2), and a limiting groove (121) is provided on the sealing ring (12) corresponding to the position of the limiting column (21); in a sealed state, the limiting column (21) is located at the top of the limiting groove (121); in a liquid injection state, the limiting column (21) is located at the bottom of the limiting groove (121).

4. The press-type sealing nail according to claim 3, characterized in that: The limiting groove (121) is an arc-shaped groove.

5. The press-type sealing nail according to claim 1, characterized in that: The sliding surface between the main body (1) and the pressing member (2) is rough.

6. The press-type sealing nail according to claim 1, characterized in that: The end surface of the main body (1) and the end surface of the pressing member (2) are flush.

7. The press-type sealing nail according to claim 1, characterized in that: A sealing rubber ring (22) is sleeved on the surface of the pressing piece (2).

8. A cylindrical battery, characterized in that: include: A battery body (100) and a press-type sealing nail as claimed in any one of claims 1 to 7.

9. The cylindrical battery according to claim 8, characterized in that: The end surface of the battery body (100) is provided with a liquid injection hole (101); when the main body (1) is welded and fixed to the liquid injection hole (101), the end surface of the main body (1) and the end surface of the pressing member (2) are both flush with the end surface of the battery body (100).

10. The cylindrical battery according to claim 8, characterized in that: The injection hole (101) is a trumpet hole, and an outer surface of the main body (1) is provided with an inclined surface (122) corresponding to the injection hole (101).

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