Sealing nail and lithium ion battery

Abstract

The utility model relates to a sealing nail and a lithium ion battery, the sealing nail comprises an elastic nail body, the nail body is cylindrical, a first clamping ring protruding outwards is formed on the periphery of the top end of the nail body, and a second clamping ring protruding outwards is formed in the middle of the nail body. On one hand, the top end of the nail body protrudes outwards through the expanding radial direction to form the first clamping ring, so that the nail body is limited in the liquid injection hole, the sealing nail can be prevented from entering a battery cell, on the other hand, the middle of the nail body protrudes outwards through the expanding radial direction to form the second clamping ring, and the second clamping ring can be clamped into the clamping groove reserved in the inner wall of the liquid injection hole, so that the sealing performance is improved; electrolyte seepage is avoided, and the production yield of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a sealing nail and a lithium-ion battery. Background Technology

[0002] Lithium-ion batteries possess advantages such as small size, large capacity, long lifespan, low self-discharge rate, no memory effect, and environmental friendliness. They are currently widely used in commercial vehicles, special-purpose vehicles, electric bicycles, energy storage systems, and medical devices. With the expansion of new energy vehicle production and sales and the increase in battery capacity per vehicle, the power battery market is maintaining rapid growth and still has significant future development potential. Power batteries are the "heart" of new energy electric vehicles, directly affecting their range and safety.

[0003] The sealing process for the injection hole requires welding a sealing pin to the injection hole and then sealing it smoothly with a cover plate. However, currently, the sealing pin and the injection hole do not fit tightly enough, and the internal pressure of the cell is high after injection, making it easy for electrolyte to leak out. This can lead to poor sealing during the sealing welding process, significantly affecting the yield of lithium battery production. Utility Model Content

[0004] Therefore, in view of the technical problem that the sealing nail and the injection hole are not tight enough, which will cause electrolyte leakage and poor sealing welding, this utility model needs to provide a sealing nail and a lithium-ion battery.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model first provides a sealing nail, which includes an elastic nail body, the nail body is cylindrical, a first outwardly protruding retaining ring is formed on the outer periphery of the top of the nail body, and a second outwardly protruding retaining ring is formed in the middle of the nail body.

[0007] This invention features a first retaining ring formed by an outwardly protruding radial diameter at the top of the nail body, which confines the nail body within the injection hole and prevents the sealing nail from entering the battery cell. The second retaining ring is formed by an outwardly protruding radial diameter in the middle of the nail body. This retaining ring can be inserted into a pre-reserved groove on the inner wall of the injection hole, improving sealing performance, preventing electrolyte leakage, and increasing the battery production yield.

[0008] As a further improvement of the above-mentioned solution of this utility model, a cavity is formed inside the nail body; when assembling the sealing nail, the setting of the internal cavity allows the nail body to be squeezed and deformed, ensuring that the second retaining ring can be inserted into the injection hole.

[0009] As a further improvement to the above-mentioned solution of this utility model, the diameter of the first retaining ring is larger than the diameter of the second retaining ring.

[0010] As a further improvement of the above-mentioned solution of this utility model, the outer circumferential cross-section of the retaining ring is flat, which facilitates its fit with the outer end of the injection hole, prevents the sealing nail from entering the battery cell, increases the contact area with the outer end of the injection hole, and improves the sealing effect.

[0011] As a further improvement to the above-mentioned solution of this utility model, the outer circumferential cross-section of the second retaining ring is an arc-shaped surface to facilitate the entry of the sealing nail into the injection hole.

[0012] As a further improvement to the above-mentioned solution of this utility model, the distance between the second retaining ring and the first retaining ring is less than the distance between the second retaining ring and the bottom end of the nail body; ensuring that the sealing nail has sufficient length in the injection hole to ensure better sealing performance.

[0013] As a further improvement to the above-mentioned solution of this utility model, the bottom edge of the nail body is chamfered to facilitate assembly into the injection hole.

[0014] As a further improvement to the above-mentioned solution of this utility model, the sealing nail is made of rubber and the nail body, retaining ring one, and retaining ring two are integrally formed.

[0015] This utility model also provides a lithium-ion battery, which includes the sealing pin as described above.

[0016] As a further improvement of the above-mentioned solution of this utility model, the lithium-ion battery further includes a cover plate, on which a recessed hole is formed and a liquid injection hole is provided through the bottom of the recessed hole. An annular groove 1 is formed at one end of the liquid injection hole near the recessed hole, and an annular groove 2 is formed on the inner circumferential surface of the liquid injection hole. The annular groove 1 and the annular groove 2 are respectively adapted to the retaining ring 1 and the retaining ring 2. The sealing pin of the liquid injection hole is installed in the liquid injection hole, and the retaining ring 1 and the retaining ring 2 are respectively engaged in the annular groove 1 and the annular groove 2.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention features a first retaining ring formed by an outwardly protruding radial diameter at the top of the nail body, which confines the nail body within the injection hole and prevents the sealing nail from entering the battery cell. The second retaining ring is formed by an outwardly protruding radial diameter in the middle of the nail body. This retaining ring can be inserted into a pre-reserved groove on the inner wall of the injection hole, improving sealing performance, preventing electrolyte leakage, and increasing the battery production yield. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a sealing nail according to an embodiment of the present utility model;

[0020] Figure 2 for Figure 1 A sectional view;

[0021] Figure 3 This is an assembly structure diagram of a sealing nail and a lithium-ion battery cover plate proposed in an embodiment of the present invention.

[0022] Attached reference numerals: 1. Nail body; 11. Snap ring one; 12. Snap ring two; 13. Cavity; 2. Cover plate. Detailed Implementation

[0023] To facilitate understanding of this invention, a more comprehensive description of the invention will be provided below with reference to specific embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0025] Reference Figure 1 This embodiment proposes a sealing pin, which includes a resilient pin body 1, the pin body 1 being cylindrical. To facilitate the installation of the sealing pin into the electrolyte filling hole of the lithium battery to seal the filling hole, this embodiment combines... Figure 2 The nail body 1 has an unpenetrated cavity 13 inside, and the bottom edge of the nail body 1 has a chamfer. When assembling the sealing nail, the nail body 1 can be deformed by squeezing it, and then the nail body 1 can be inserted into the injection hole. After releasing the nail body 1, the nail body 1 can return to its original shape in the injection hole.

[0026] To improve sealing, in this embodiment, a protruding retaining ring 11 is formed on the outer periphery of the top of the nail body 1, and the outer periphery of retaining ring 11 is planar. A protruding retaining ring 12 is formed in the middle of the nail body 1, and the outer periphery of retaining ring 12 is arc-shaped. The diameter of retaining ring 12 is smaller than the diameter of retaining ring 1, and the distance between retaining ring 12 and retaining ring 11 is smaller than the distance between retaining ring 12 and the bottom end of the nail body 1. Adapted, combined... Figure 3 Generally, a recessed hole is formed on the lithium-ion battery cover plate 2. A liquid injection hole is opened through the bottom of the recessed hole and through the cover plate 2. The diameter of the nail body 1 is adapted to the diameter of the liquid injection hole. An annular groove 1 is formed at the end of the liquid injection hole near the recessed hole. An annular groove 2 is formed on the inner circumferential surface of the liquid injection hole. The diameters of the annular groove 1 and the annular groove 2 are adapted to the diameters of the retaining ring 11 and the retaining ring 2 12, respectively. After the nail body 1 is inserted into the liquid injection hole, the retaining ring 11 and the retaining ring 2 12 are adapted to be engaged in the annular groove 1 and the annular groove 2, respectively.

[0027] With the above structural design, the diameter of the retaining ring 12 in the middle of the sealing nail is larger than the diameter of the injection hole. Since the nail body 1 is elastic and has an internal cavity 13 that does not penetrate the sealing nail, the retaining ring 12 protruding in the middle can enter the annular groove 2 in the middle of the injection hole. When the nail body 1 enters the injection hole, due to the deformation resistance, the retaining ring 12 returns to its original shape and is locked in the annular groove 2 in the middle of the sealing nail, forming a seal, improving the battery's sealing performance, preventing electrolyte leakage, and improving the battery sealing welding yield.

[0028] The sealing nail in this embodiment can be integrally injection molded from rubber material, which is simple to mold and easy to produce.

[0029] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A sealing nail comprising a resilient nail body (1), characterized in that, The nail body (1) is cylindrical, with a protruding retaining ring 1 (11) formed on the outer periphery of the top of the nail body (1) and a protruding retaining ring 2 (12) formed in the middle of the nail body (1); a cavity is formed inside the nail body (1); the distance between retaining ring 2 (12) and retaining ring 1 (11) is less than the distance between retaining ring 2 (12) and the bottom of the nail body (1); the sealing nail is made of rubber and the nail body (1), retaining ring 1 (11) and retaining ring 2 (12) are integrally formed.

2. The sealing nail according to claim 1, characterized in that, The diameter of ring one (11) is larger than the diameter of ring two (12).

3. The sealing nail according to claim 1, characterized in that, The outer circumferential section of the ring 1 (11) is a plane.

4. The sealing nail according to claim 1, characterized in that, The outer circumferential cross section of the second ring (12) is an arc-shaped surface.

5. The sealing nail according to claim 1, characterized in that, The bottom edge of the nail body (1) is chamfered.

6. A lithium-ion battery, characterized in that, It includes the sealing pin as described in any one of claims 1-5.

7. The lithium-ion battery according to claim 6, characterized in that, The lithium-ion battery also includes a cover plate (2), a recessed hole is formed on the cover plate (2) and a liquid injection hole is provided through the bottom of the recessed hole. An annular groove one is formed at one end of the liquid injection hole near the recessed hole, and an annular groove two is formed on the inner circumferential surface of the liquid injection hole. The annular groove one and the annular groove two are respectively adapted to the retaining ring one (11) and the retaining ring two (12). The sealing nail is installed in the liquid injection hole, and the retaining ring one (11) and the retaining ring two (12) are respectively engaged in the annular groove one and the annular groove two.

Images