Sealing structure

Abstract

The utility model provides a sealing structure. The sealing structure provided by the utility model comprises a battery cover plate and formation nails, a liquid injection hole is formed in the battery cover plate; the formation nail comprises a first connecting part, a second connecting part and a third connecting part which are fixedly connected in sequence; two ends of the second connecting part are respectively connected with the first connecting part and the third connecting part; the cross section size of one end, close to the second connecting part, of the first connecting part is larger than that of one end, close to the first connecting part, of the second connecting part; the cross section size of one end, close to the second connecting part, of the third connecting part is larger than that of one end, close to the third connecting part, of the second connecting part; the liquid injection hole is filled with the second connecting part and the third connecting part; the second connecting part is attached to the hole wall of the liquid injection hole. According to the sealing structure, the stability and the sealing performance of the sealing structure can be enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially relates to a sealing structure. BACKGROUND

[0002] In the formation process of lithium battery manufacturing, it is necessary to insert the formation nail in the liquid injection hole of the battery cover plate to prevent the leakage of electrolyte in the battery. The structure of the formation nail and the liquid injection hole made by the prior art is relatively simple. If the size of the liquid injection hole cannot completely match the size of the formation nail, the formation nail will be buckled after being inserted into the liquid injection hole, thereby the sealing property and stability of the structure of the formation nail and the liquid injection hole are insufficient. However, it is difficult to avoid some errors in the process of manufacturing the formation nail and the liquid injection hole. Therefore, it is urgent to optimize the traditional structure of the formation nail and the liquid injection hole. SUMMARY

[0003] The utility model discloses a sealing structure, which solves the technical problem of insufficient sealing property and stability of the structure of the formation nail and the liquid injection hole in the prior art.

[0004] The technical scheme of the utility model is as follows: a sealing structure, comprising a battery cover plate and a formation nail.

[0005] The battery cover plate is provided with a liquid injection hole.

[0006] The formation nail comprises a first connecting part, a second connecting part and a third connecting part which are fixedly connected in sequence.

[0007] The two ends of the second connecting part are connected with the first connecting part and the third connecting part respectively. The cross-sectional dimension of the end of the first connecting part close to the second connecting part is greater than the cross-sectional dimension of the end of the second connecting part close to the first connecting part. The cross-sectional dimension of the end of the third connecting part close to the second connecting part is greater than the cross-sectional dimension of the end of the second connecting part close to the third connecting part.

[0008] The second connecting part and the third connecting part are filled in the liquid injection hole. The second connecting part is attached to the hole wall of the liquid injection hole.

[0009] Preferably, the battery cover plate is provided with a step part, and a part of the first connecting part close to the second connecting part fills the step part.

[0010] Preferably, the formation nail further comprises a fourth connecting part, the fourth connecting part is connected to the end of the third connecting part away from the second connecting part, and the cross-sectional dimension of the fourth connecting part gradually decreases from the end close to the third connecting part to the end away from the third connecting part.

[0011] Preferably, the fourth connecting part has a cross-sectional dimension equal to that of the third connecting part near one end of the fourth connecting part.

[0012] Preferably, the fourth connecting part has a reverse circular platform shape.

[0013] Preferably, the first, second and third connecting parts are all elastic structures.

[0014] Preferably, the second and third connecting parts are both columnar bodies, and before the second and third connecting parts are filled in the liquid injection hole, the liquid injection hole has a diameter of 6.00 mm, the second connecting part has a diameter of 6.16 mm, and the third connecting part has a diameter of 6.40 mm.

[0015] Preferably, the first connecting part comprises a holding part and a buffer part, two ends of the buffer part are connected with the holding part and the second connecting part respectively, and the holding part and the buffer part have the same cross-sectional dimension at the connection therebetween.

[0016] Preferably, the cross-sectional dimension of the buffer part gradually increases from one end near the second connecting part to the other end away from the second connecting part, and the cross-sectional dimension of the holding part gradually decreases from one end near the buffer part to the other end away from the buffer part.

[0017] Preferably, the first, second and third connecting parts are integrally formed.

[0018] The first connecting part has a cross-sectional dimension greater than that of the second connecting part near one end of the second connecting part, and the third connecting part has a cross-sectional dimension greater than that of the second connecting part near one end of the third connecting part. The second connecting part is embedded in the liquid injection hole and adheres to the hole wall of the liquid injection hole, the lower end of the first connecting part and the upper end of the third connecting part stably hold the second connecting part in the liquid injection hole, which prevents the formation nail from popping out or warping, ensures the sealing environment of the liquid injection hole, and enhances the stability and sealing property of the sealing structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a sectional view of the sealing structure of the embodiment of the utility model.

[0020] Figure 2 is a structure schematic view of the formation nail of the embodiment of the utility model.

[0021] Battery cover plate-10; liquid injection hole-11; stepped portion-12; formation nail-20; first connecting portion-21; holding portion-211; buffer portion-212; second connecting portion-22; third connecting portion-23; fourth connecting portion-24. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only one embodiment of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In this document, reference to“an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. Those skilled in the art will appreciate that embodiments described herein can be combined with other embodiments in various ways.

[0024] Figure 1 is a sectional view of the sealing structure of the embodiment of the present application. It should be noted that the sealing structure of the present application is not limited to the structure shown in Figure 1 As shown in Figure 1 The sealing structure comprises a battery cover plate 10 and a formation nail 20.

[0025] The battery cover plate 10 is provided with a liquid injection hole 11.

[0026] The formation nail 20 comprises a first connecting portion 21, a second connecting portion 22 and a third connecting portion 23 connected in sequence.

[0027] The two ends of the second connecting portion 22 are connected with the first connecting portion 21 and the third connecting portion 23 respectively. The cross-sectional dimension of the end of the first connecting portion 21 close to the second connecting portion 22 is greater than the cross-sectional dimension of the end of the second connecting portion 22 close to the first connecting portion 21. The cross-sectional dimension of the end of the third connecting portion 23 close to the second connecting portion 22 is greater than the cross-sectional dimension of the end of the second connecting portion 22 close to the third connecting portion 23.

[0028] The second connecting portion 22 and the third connecting portion 23 are filled in the liquid injection hole 11. The second connecting portion 22 is in close contact with the hole wall of the liquid injection hole 11.

[0029] In the embodiment, when the liquid injection hole 11 is sealed, the second connecting part 22 and the third connecting part 23 are embedded into the liquid injection hole 11, and the second connecting part 22 is attached to the hole wall of the liquid injection hole 11. Since the cross-sectional dimension of the first connecting part 21 at the end close to the second connecting part 22 is larger than the cross-sectional dimension of the second connecting part 22 at the end close to the first connecting part 21, and the cross-sectional dimension of the third connecting part 23 at the end close to the second connecting part 22 is larger than the cross-sectional dimension of the second connecting part 22 at the end close to the third connecting part 23, the end of the first connecting part 21 close to the second connecting part 22 and the end of the third connecting part 23 close to the second connecting part 22 can firmly hold the second connecting part 22 in the liquid injection hole 11, so that the formation nail 20 can be prevented from being popped out or lifted up, the sealing environment at the liquid injection hole 11 is ensured, and the stability and the sealing property of the sealing structure of the utility model are enhanced.

[0030] In some embodiments, as shown in Figure 1 , the battery cover plate 10 is provided with a step part 12, and the first connecting part 21 fills the step part 12 at the part close to the second connecting part 22.

[0031] In the embodiment, the battery cover plate 10 is provided with a step part 12, and when the formation nail 20 is inserted into the liquid injection hole 11, the first connecting part 21 fills the step part 12 at the part close to the second connecting part 22, so that the step part 12 can fix the first connecting part 21 and prevent the first connecting part 21 from being displaced and affecting the stability of the sealing structure.

[0032] Figure 2 The structure diagram of the formation nail of the utility model embodiment, in some embodiments, as shown in Figure 1 and Figure 2 , the formation nail 20 further comprises a fourth connecting part 24, the fourth connecting part 24 is connected to the end of the third connecting part 23 away from the second connecting part 22, and the cross-sectional dimension of the fourth connecting part 24 gradually decreases from the end close to the third connecting part 23 to the end away from the third connecting part 23.

[0033] In the embodiment, the cross-sectional dimension of the fourth connecting part 24 gradually decreases from the end close to the third connecting part 23 to the end away from the third connecting part 23. When the formation nail 20 is inserted into the liquid injection hole 11, the end of the fourth connecting part 24 with the smallest cross-sectional dimension enters the liquid injection hole 11 first, so that the insertion efficiency can be improved.

[0034] In some embodiments, as shown in Figure 1 and Figure 2As shown, the fourth connecting part 24 is in inverted circular truncated cone shape.

[0035] In the embodiment, the fourth connecting part 24 is in inverted circular truncated cone shape, which makes the forming nail 20 similar to a wedge structure, facilitating the insertion of the forming nail 20 into the liquid injection hole 11 and reducing the assembly difficulty.

[0036] In some embodiments, as shown in Figure 1 and Figure 2 As shown, the fourth connecting part 24 is in inverted circular truncated cone shape.

[0037] In the embodiment, the fourth connecting part 24 is in inverted circular truncated cone shape, which makes the forming nail 20 similar to a wedge structure, facilitating the insertion of the forming nail 20 into the liquid injection hole 11 and reducing the assembly difficulty.

[0038] In some embodiments, the first connecting part 21, the second connecting part 22 and the third connecting part 23 are all elastic structures.

[0039] In the embodiment, the first connecting part 21, the second connecting part 22 and the third connecting part 23 are made of elastic material, which can improve the sealing efficiency through the interference fit between the second connecting part 22 and the liquid injection hole 11. The elastic material can be at least one of rubber and silicone. The fourth connecting part 24 can also be made of the aforementioned materials.

[0040] In some embodiments, the second connecting part 22 and the third connecting part 23 are both columnar bodies, the diameter of the second connecting part 22 is 6.16mm, and the diameter of the third connecting part 23 is 6.40mm before the second connecting part 22 and the third connecting part 23 are filled in the liquid injection hole 11.

[0041] In the embodiment, the specific values of the diameter of the liquid injection hole 11, the diameter of the second connecting part 22 and the diameter of the third connecting part 23 are provided. It should be noted that the diameter of the second connecting part 22 is slightly larger than the diameter of the liquid injection hole 11 before the second connecting part 22 and the third connecting part 23 are filled in the liquid injection hole 11, and the second connecting part 22 is interference fit with the liquid injection hole 11 after the second connecting part 22 and the third connecting part 23 are filled in the liquid injection hole 11. In actual application, the related values can be adjusted by the person skilled in the art according to the actual application.

[0042] In some embodiments, as shown in Figure 1and Figure 2 As shown, the first connecting part 21 includes a gripping part 211 and a buffer part 212. The two ends of the buffer part 212 are respectively connected to the gripping part 211 and the second connecting part 22. The cross-sectional dimensions of the connection between the gripping part 211 and the buffer part 212 are the same.

[0043] In this embodiment, the first connecting portion 21 includes a gripping portion 211 and a buffer portion 212. The gripping portion 211 helps to hold and fix the formation nail 20. The lower end of the buffer portion 212 abuts against the upper end of the battery cover plate 10, improving the sealing efficiency of the formation nail 20.

[0044] In some embodiments, such as Figure 1 and Figure 2 As shown, the cross-sectional dimension of the buffer portion 212 gradually increases from one end near the second connecting portion 22 to one end away from the second connecting portion 22; the cross-sectional dimension of the grip portion 211 gradually decreases from one end near the buffer portion 212 to one end away from the buffer portion 212.

[0045] In this embodiment, the cross-sectional dimension of the buffer portion 212 gradually increases from one end near the second connecting portion 22 to one end away from the second connecting portion 22, and the cross-sectional dimension of the grip portion 211 gradually decreases from one end near the buffer portion 212 to one end away from the buffer portion 212. This structural design facilitates the gripping and insertion of the formed nail 20 and improves the assembly efficiency of the formed nail 20.

[0046] In some embodiments, the first connecting portion 21, the second connecting portion 22, and the third connecting portion 23 are integrally formed.

[0047] In this embodiment, the first connecting part 21, the second connecting part 22 and the third connecting part 23 are integrally formed, which can improve the overall structural strength of the chemically formed nail 20, thereby improving the working life of the chemically formed nail 20 of this utility model.

[0048] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A seal structure, characterized by, The battery cover plate and the formation nail are included; The battery cover plate is provided with a liquid injection hole; The formation nail includes a first connecting part, a second connecting part and a third connecting part which are sequentially fixedly connected; Two ends of the second connecting part are connected with the first connecting part and the third connecting part respectively; the cross-sectional dimension of one end of the first connecting part close to the second connecting part is greater than the cross-sectional dimension of one end of the second connecting part close to the first connecting part; the cross-sectional dimension of one end of the third connecting part close to the second connecting part is greater than the cross-sectional dimension of one end of the second connecting part close to the third connecting part; The second connecting part and the third connecting part are filled in the liquid injection hole; the second connecting part is attached to the hole wall of the liquid injection hole.

2. The seal structure of claim 1, wherein The battery cover plate is provided with a step part, and a part of the first connecting part close to the second connecting part fills the step part.

3. The seal structure of claim 1, wherein The formation nail further includes a fourth connecting part which connects one end of the third connecting part away from the second connecting part; the cross-sectional dimension of the fourth connecting part gradually decreases from one end close to the third connecting part to one end away from the third connecting part.

4. The seal structure of claim 3, wherein The cross-sectional dimension of one end of the fourth connecting part close to the third connecting part is equal to the cross-sectional dimension of one end of the third connecting part close to the fourth connecting part.

5. The seal structure of claim 3, wherein The fourth connecting part is in the shape of an inverted circular truncated cone.

6. The sealed structure of claim 1, wherein, The first connecting part, the second connecting part and the third connecting part are all in elastic structure.

7. The seal structure of claim 6, wherein The second connecting part and the third connecting part are both in the shape of a column; the hole diameter of the liquid injection hole is 6.00mm; before the second connecting part and the third connecting part are filled in the liquid injection hole, the diameter of the second connecting part is 6.16mm, and the diameter of the third connecting part is 6.40mm.

8. The sealed structure of claim 1, wherein, The first connecting part includes a holding part and a buffer part; two ends of the buffer part are connected with the holding part and the second connecting part respectively; the cross-sectional dimension of the connection between the holding part and the buffer part is the same.

9. The seal structure of claim 8, wherein, The cross-sectional dimension of the buffer part gradually increases from one end close to the second connecting part to one end away from the second connecting part; the cross-sectional dimension of the holding part gradually decreases from one end close to the buffer part to one end away from the buffer part.

10. The sealed structure of claim 1, wherein The first connecting part, the second connecting part and the third connecting part are integrally formed.

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