Sealing structure and top cover assembly

Abstract

The utility model belongs to the technical field of secondary batteries, and specifically provides a sealing structure and a top cover assembly; the utility model is used to seal the injection hole on the battery cover plate, and includes a first sealing member having a through hole, and the through hole is connected to the injection hole in the manner that the first sealing member is inserted into the injection hole; the second sealing member is detachably installed in the through hole; the utility model can not only achieve battery sealing before welding the sealing plate, but also can implement secondary liquid replenishment in the injection hole through the through hole by disassembling the second sealing member. Not only that, the application also has the advantage of simple structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary batteries, and in particular relates to a sealing structure and a top cover assembly. Background Art

[0002] In order to facilitate the primary and secondary filling of cylindrical batteries, a filling hole is set on the cover of the cylindrical battery, but the sealing plate cannot be welded to the corresponding position of the cover before the secondary filling process. In the process from the primary filling to the secondary filling, in order to ensure the sealing of the battery, two sealing pins with different structures are required, and the structure is complicated.

[0003] Based on this, it is urgent to invent a sealing structure and a top cover assembly to solve the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to simplify the structure of the sealing structure under the premise of enabling the sealing structure to have a secondary liquid replenishing function. In view of the above problems, a sealing structure and a top cover assembly are provided.

[0005] The technical solution of the utility model to solve the above technical problems is to provide a sealing structure for sealing the injection hole on the battery cover; including:

[0006] A first sealing member having a through hole, wherein the through hole is connected to the injection hole in a manner that the first sealing member is inserted into the injection hole;

[0007] The second sealing member is detachably mounted in the through hole.

[0008] Specifically, the first sealing member includes a main body portion that matches the shape of a portion of the injection hole, and the top of the main body portion extends toward the circumference to form an edge.

[0009] Specifically, a sealing portion for facilitating insertion and removal of the second sealing member is provided on the outer peripheral side of the second sealing member.

[0010] More specifically, the sealing portion is an external thread.

[0011] Specifically, the top of the second sealing member has a handle that is convenient for hand holding.

[0012] In one embodiment, the utility model further provides a top cover assembly, comprising a cover plate and the sealing structure as described above, and the sealing structure is assembled on the cover plate;

[0013] The cover plate is provided with a first liquid injection hole, and the edge is assembled to the cover plate through the first sealing member to abut against the hole wall of the first liquid injection hole.

[0014] Specifically, the sealing structure further comprises a sealing plate, and the top surface of the sealing plate is flush with the top surface of the cover plate;

[0015] The cover plate is also provided with a second liquid injection hole for accommodating the sealing plate.

[0016] More specifically, the cover plate is also provided with a third liquid injection hole which is interference-fitted with the main body;

[0017] Along the thickness direction of the cover plate, the first liquid injection hole, the second liquid injection hole and the third liquid injection hole are connected to each other and pass through the cover plate.

[0018] More specifically, the diameter of the second injection hole is larger than that of the first injection hole, and the diameter of the first injection hole is larger than that of the third injection hole.

[0019] Specifically, the first injection hole, the second injection hole and the third injection hole are all coaxially arranged.

[0020] The beneficial effect of the utility model is that by detachably installing the second sealing member in the through hole of the first sealing member, before welding the sealing plate, not only can the battery be sealed, but also the second sealing member can be disassembled to implement secondary liquid replenishment in the liquid injection hole through the through hole. In addition, the application also has the advantage of simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the implementation modes of the present invention, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the top cover assembly and the sealing structure of the utility model in a matching state;

[0023] Figure 2 It is a structural schematic diagram of the sealing structure of the utility model being matched to the top cover assembly.

[0024] Reference numerals:

[0025] 1-top cover assembly; 10-cover plate; 11-liquid injection hole; 110-first liquid injection hole; 111-second liquid injection hole; 112-third liquid injection hole;

[0026] 2-sealing structure; 20-first sealing member; 200-through hole; 201-main body; 202-edge; 21-second sealing member; 210-sealing part; 211-holding part; 22-sealing plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] refer to Figure 1 and Figure 2 The utility model discloses a sealing structure 2 for a liquid injection hole 11 of a battery upper cover plate 10, which is used for sealing the liquid injection hole 11 of the battery upper cover plate 10. It not only has a simple structure, but also can have both a sealing function and a secondary liquid replenishing function after one liquid injection without welding a sealing plate 22.

[0029] Implementation Method 1

[0030] The utility model discloses a sealing structure 2 for sealing a liquid injection hole 11 on a battery cover 10. The sealing structure 2 includes a first sealing member 20 and a second sealing member 21 installed in the first sealing member 20. Specifically, the first sealing member 20 has a through hole 200 that is straight-walled and penetrates the first sealing member 20, and the through hole 200 is connected to the liquid injection hole 11 in such a way that the first sealing member 20 is inserted in the liquid injection hole 11. That is to say, when the first sealing member 20 is inserted in the liquid injection hole 11, the through hole 200 is connected to the liquid injection hole 11 to facilitate the subsequent secondary liquid replenishment (for details, refer to the following). It should be noted that, in other specific embodiments, the shape of the through hole 200 may not be straight-walled, but may be a through hole 200 with a vertical cross-section that is roughly an inverted trapezoidal shape.

[0031] Specifically, the second sealing member 21 is detachably mounted in the through hole 200. After the liquid is injected into the injection hole 11, the sealing of the battery can be achieved without welding the sealing plate 22 to the cover plate 10 (for subsequent secondary liquid replenishment). In other words, the second sealing member 21 only needs to be removed to perform secondary liquid replenishment in the injection hole 11 through the through hole 200 of the first sealing member 20.

[0032] Implementation Method 2

[0033] The difference between this embodiment and embodiment 1 is that: in order to seal the injection hole 11 through the first sealing member 20, the first sealing member 20 includes a main body portion 201 that matches the shape of a portion of the injection hole 11, and Figure 1 and Figure 2Obviously, the shape of the main body 201 is columnar or rod-shaped. Furthermore, in order to ensure the sealing effect of the first sealing member 20 sealing the injection hole 11, the top of the main body 201 extends toward the circumferential side to form an edge 202 that presses against part of the wall of the injection hole 11 (refer to the following for details). It can be understood that the vertical cross-section of the first sealing member 20 can be roughly "T"-shaped. In other specific embodiments, the shape of the first sealing member 20 is not limited, and the materials of the first sealing member and the second sealing member are PP materials. And the other parts of this embodiment are the same as those of embodiment 1, and will not be repeated here.

[0034] Implementation 3

[0035] The difference between this embodiment and embodiment 1 is that in order to ensure the sealing effect of the second sealing member 21 sealing the through hole 200 and to facilitate the plugging and unplugging of the second sealing member 21 for subsequent secondary fluid replenishment, a sealing portion 210 is provided on the outer peripheral side of the second sealing member 21 for facilitating the plugging and unplugging of the second sealing member 21. It can be understood that the peripheral side of the sealing portion 210 presses against the hole wall of the through hole 200 to ensure the sealing effect of the second sealing member 21 sealing the through hole 200. The other parts of this embodiment are the same as those of embodiment 1 and are not described in detail here.

[0036] Implementation 4

[0037] The difference between this embodiment and embodiment 3 is that, in order to facilitate the manufacturing and processing of the sealing portion 210, the sealing portion 210 can be an external thread protruding from the peripheral side of the main body 201. Of course, in other specific embodiments, the shape and structure of the sealing portion 210 are not limited. And the other parts of this embodiment are the same as those of embodiment 1, and are not described here.

[0038] Implementation method 5

[0039] The difference between this embodiment and embodiment 1 is that, in order to facilitate the insertion and removal of the second sealing member 21, the top of the second sealing member 21 has a grip portion 211 that is convenient for hand gripping, so that the second sealing member 21 can be inserted and removed through the grip portion 211. The other parts of this embodiment are the same as those of embodiment 1, and will not be described here.

[0040] Implementation 6

[0041] The difference between this embodiment and the above-mentioned embodiment is that this embodiment provides a top cover assembly 1, which includes a cover plate 10 and a sealing structure 2 as described above, and the sealing structure 2 is assembled on the cover plate 10. Specifically, the sealing structure 2 is assembled into the injection hole 11 on the cover plate 10. Obviously, the cover plate 10 is provided with a first injection hole 110 (the injection hole 11 includes a first injection hole 110, a second injection hole 111 and a third injection hole 112, refer to the following for details), and the bottom surface of the edge 202 is assembled to the cover plate 10 through the first sealing member 20 and abuts against the bottom surface of the first injection hole 110, thereby ensuring that the first sealing member 20 is firmly connected to the injection hole 11. And the other parts of this embodiment are the same as those of other embodiments, which will not be repeated here.

[0042] Implementation 7

[0043] The difference between this embodiment and embodiment 6 is that in order to further ensure that the sealing structure 2 and the injection hole 11 of the cover plate 10 are firmly sealed, the sealing structure 2 also includes a sealing plate 22 welded to the cover plate 10 (the shape of the sealing plate 22 can be a round cake or a rectangular shape. Of course, in other specific embodiments, the shape of the sealing plate 22 is not limited). Correspondingly, in order to accommodate the sealing plate 22, the cover plate 10 is also provided with a second injection hole 111 that is connected to the first injection hole 110 and is used to accommodate the sealing plate 22. Since the sealing plate 22 needs to be welded to the cover plate 10 after the second liquid replenishment, in order to facilitate installation, the sealing plate 22 needs to be arranged above the first sealing member 20 and the second sealing member 21, that is, the surface of the sealing plate 22 is flush with the top surface of the cover plate 10. In other words, one end of the hole wall of the second injection hole 111 is also flush with the top surface of the cover plate 10.

[0044] Moreover, since the size of the cover plate 10 is much larger than the size of the first sealing member 20 and the second sealing member 21, the aperture of the second injection hole 111 is larger than the aperture of the first injection hole 110. Obviously, the first injection hole 110 and the second injection hole 111 are both round holes. Of course, in other specific embodiments, the first injection hole 110 and the second injection hole 111 can also be other shapes, such as square holes, special-shaped holes, etc. And the other parts of this embodiment are the same as those of embodiment 6, and will not be repeated here.

[0045] Implementation 8

[0046] The difference between this embodiment and Embodiment 7 is that, in order to facilitate the processing of the injection hole 11, the second injection hole 111 is coaxially arranged with the first injection hole 110. The other parts of this embodiment are the same as those of Embodiment 7 and will not be described in detail.

[0047] Implementation method 9

[0048] The difference between this embodiment and embodiment 6 is that, in order to accommodate the main body 201 of the first sealing member 20, a third injection hole 112 is further provided on the cover plate 10, which is connected to the first injection hole 110 and has an interference fit with the main body 201. Moreover, one end of the hole wall of the third injection hole 112 is flush with the bottom surface of the cover plate 10. In other words, the first injection hole 110, the second injection hole 111 and the third injection hole 112 are connected to each other and pass through the cover plate 10.

[0049] Since the first injection hole 110 is used to receive the edge 202 and the third injection hole 112 is used to receive the main body 201, the diameter of the first injection hole 110 is larger than that of the third injection hole 112. The other parts of this embodiment are the same as those of Embodiment 6 and will not be described in detail.

[0050] Embodiment 10

[0051] The difference between this embodiment and embodiment 9 is that, in order to facilitate the processing of the injection hole 11, the third injection hole 112 is coaxially arranged with the first injection hole 110. In other words, the diameter of the second injection hole 111, the diameter of the first injection hole 110 and the diameter of the third injection hole 112 decrease in sequence. The other parts of this embodiment are the same as those of embodiment 9 and will not be described in detail here.

[0052] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A sealing structure for sealing a liquid injection hole on a battery cover; characterized in that: include: A first sealing member having a through hole, wherein the through hole is connected to the injection hole in a manner that the first sealing member is inserted into the injection hole; The second sealing member is detachably mounted in the through hole.

2. The sealing structure according to claim 1, characterized in that: The first sealing member comprises a main body portion which matches the shape of a part of the injection hole, and the top of the main body portion extends toward the circumference to form an edge.

3. The sealing structure according to claim 1, characterized in that: A sealing portion for facilitating insertion and removal of the second sealing member is provided on the outer peripheral side of the second sealing member.

4. The sealing structure according to claim 3, characterized in that: The sealing portion is an external thread.

5. The sealing structure according to claim 1, characterized in that: The top of the second sealing member is provided with a handle which is convenient for hand holding.

6. A top cover assembly, characterized in that: A method comprising a cover plate and a sealing structure as claimed in any one of claims 1 to 5, wherein the sealing structure is assembled to the cover plate; The cover plate is provided with a first liquid injection hole, and the edge is assembled to the cover plate through the first sealing member to abut against the hole wall of the first liquid injection hole.

7. The top cover assembly according to claim 6, characterized in that: The sealing structure further comprises a sealing plate, and the top surface of the sealing plate is flush with the top surface of the cover plate; The cover plate is also provided with a second liquid injection hole for accommodating the sealing plate.

8. The top cover assembly according to claim 7, characterized in that: The cover plate is also provided with a third liquid injection hole which is interference fit with the main body; Along the thickness direction of the cover plate, the first liquid injection hole, the second liquid injection hole and the third liquid injection hole are connected to each other and pass through the cover plate.

9. The top cover assembly according to claim 8, characterized in that: The aperture of the second liquid injection hole is larger than that of the first liquid injection hole, and the aperture of the first liquid injection hole is larger than that of the third liquid injection hole.

10. The top cover assembly according to claim 9, characterized in that: The first liquid injection hole, the second liquid injection hole and the third liquid injection hole are all coaxially arranged.

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