Sealing rubber nail for sealing liquid air leakage of lithium ion battery

Abstract

The utility model provides a sealing rubber nail for sealing liquid air leakage of a lithium ion battery, which comprises a sealing seat and a sealing joint, the sealing seat is connected to the top end of the sealing joint, the sealing seat is coated with a film, and the sealing seat and the sealing joint are provided with through holes. The sealing seat is subjected to film coating treatment, the whole sealing rubber nail is provided with the through hole, the film coating is used for sealing during negative pressure of helium, after sealing welding, laser is used for hitting the position of the sealing rubber nail, the film on the sealing rubber nail is melted through heat of the laser, the sealing helium can escape through the through hole of the sealing rubber nail, and the sealing rubber nail is sealed. And if the welding quality is not qualified, the helium can be detected and captured by the helium detection equipment, so that the detection accuracy of the helium detection equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to a sealing glue nail for liquid leakage of lithium-ion battery sealing liquid. Background Technique

[0002] In the manufacturing process of power batteries, after the secondary liquid injection process is completed, the liquid injection holes on the top cover plate need to be sealed to prevent the overflow of electrolyte. Otherwise, there will be a major safety hazard of electrolyte leakage. The existing technology is to first insert a traditional sealing glue nail into the liquid injection hole until the connection between the sealing joint and the sealing seat is inserted to the top of the liquid injection hole, fill helium under negative pressure, then weld the sealing aluminum sheet by laser and use a helium detection device to detect the welding effect. When it is detected that there is no helium leakage, it is determined that the battery does not leak liquid.

[0003] A sealing glue nail for liquid leakage of square lithium batteries is disclosed in the prior art, with the application number CN211428266U. The interference fit between the threaded sealing seat and the liquid injection hole ensures the tightness of the liquid sealing of the sealing glue nail to the liquid injection hole. This kind of sealing glue nail requires the first thread of the threaded sealing seat to be outside the liquid injection hole, but in actual work, the force is difficult to master, and the sealing glue nail is often completely nailed into the liquid injection hole, resulting in the inability of the pre-filled helium to leak out, the helium detection fails, and it is impossible to judge whether the welding of the sealing aluminum sheet is qualified. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is how to ensure the accuracy of the detection by the helium detection device.

[0005] The utility model realizes the solution of the above technical problems through the following technical means:

[0006] The utility model provides a sealing glue nail for liquid leakage of lithium-ion battery sealing liquid, which includes a sealing seat and a sealing joint. The sealing seat is connected to the top end of the sealing joint. The sealing seat is subjected to film covering treatment, and through holes are provided in the sealing seat and the sealing joint.

[0007] Beneficial effects: The utility model performs film covering treatment on the sealing seat and sets through holes in the whole sealing glue nail. The film covering is for sealing when under negative pressure helium. After sealing and welding, use laser to hit the top position of the sealing glue nail. The heat of the laser melts the film at the top of the sealing glue nail, and the sealed helium can escape through the through hole of the sealing glue nail. If the welding quality is unqualified, the helium will be detected and captured by the helium detection device, thus ensuring the accuracy of the detection by the helium detection device.

[0008] Preferably, the sealing seat is provided with a first through hole, and the sealing joint is provided with a second through hole, and the first through hole and the second through hole are misaligned and communicated.

[0009] Beneficial effects: The two through-holes of the present utility model are arranged in a misaligned and connected manner to prevent the laser power from being too large, so that the laser directly passes through the through-holes and hits the battery, damaging the battery.

[0010] Preferably, the aperture of the first through-hole is larger than that of the second through-hole.

[0011] Preferably, the aperture of the first through-hole is 0.8 - 1.2 mm.

[0012] Preferably, the aperture of the second through-hole is 0.4 - 0.8 mm.

[0013] Preferably, the sealing joint includes a cylindrical upper part and an inverted conical boss-shaped lower part, and a plurality of vertical sections are provided on the side wall of the upper part of the sealing joint.

[0014] Preferably, the first through-hole is arranged in the middle of the sealing seat.

[0015] Preferably, the second through-hole is arranged in the vertical section of the sealing joint.

[0016] Preferably, the outer wall of the sealing seat is an inverted conical surface, and the inclination angle of the conical surface is 1 - 5 degrees.

[0017] Preferably, the sealing joint and the sealing seat are connected through a fillet transition structure. Description of the drawings

[0018] Figure 1 is a three-dimensional schematic diagram of a sealing glue nail for preventing liquid leakage in a lithium-ion battery in the embodiment;

[0019] Figure 2 is a cross-sectional schematic diagram of a sealing glue nail for preventing liquid leakage in a lithium-ion battery in the embodiment;

[0020] Figure 3 is a plan schematic diagram of a sealing glue nail for preventing liquid leakage in a lithium-ion battery in the embodiment. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are some, rather than all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, 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, so it cannot be understood as a limitation to the present utility model; in addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 circumstances.

[0023] Embodiment 1

[0024] As Figures 1-3 shown, this embodiment provides a sealing glue nail for leakage of liquid injection in a lithium-ion battery. The sealing glue nail includes a sealing seat 10 and a sealing joint 20. The outer wall of the sealing seat 10 is an inverted conical surface, and the conical surface inclination angle is 1 degree. Those of ordinary skill in the art can understand that an inclination within the range of 1 - 5 degrees is acceptable. The sealing seat 10 is connected to the top end of the sealing joint 20, and the sealing joint 20 is connected to the sealing seat 10 through a fillet transition structure 30.

[0025] The sealing seat 10 is subjected to film covering treatment, so there is a layer of film 11 at the top end of the sealing seat 10. The film material can be PP material or PE material, and the thickness of the film 11 is the normal thickness of the PP material or PE material film. Before sealing the lithium-ion battery, negative pressure helium gas is applied to the liquid injection hole. When the sealing glue nail seals the liquid injection hole, in order to prevent premature leakage of helium gas, film covering sealing is carried out.

[0026] The sealing seat 10 and the sealing joint 20 are provided with through holes. The sealing seat 10 is provided with a first through hole 12. The first through hole 21 is arranged from the top end of the sealing seat 10 to the top end of the sealing joint 20, and the first through hole 12 is arranged in the middle of the sealing seat 10.

[0027] The sealing joint 20 includes a cylindrical upper part and an inverted conical boss-shaped lower part. Three vertical sections 21 are provided on the side wall of the upper part of the sealing joint, and the included angle between adjacent vertical sections 21 is 120 degrees. The sealing joint 20 is provided with a second through hole 22, which is arranged on the vertical section 21. The second through hole 22 extends from the top end to the bottom end of the sealing joint 20. The bottom of the first through hole 12 is communicated with the second through hole 22. By misaligning the first through hole 12 and the second through hole 22, when laser welding is performed on the liquid injection hole using a sealing aluminum sheet, it is prevented that the laser power is too large and the laser directly passes through the through hole and hits the battery, thereby damaging the battery, as Figure 2 shown.

[0028] The diameter of the sealing joint 20 is smaller than the diameter of the sealing seat 10, and the outer surface of the upper part of the sealing joint 20 is smoothly transitioned with the outer surface of the sealing seat 10.

[0029] The aperture of the first through hole 12 is larger than the aperture of the second through hole 22. The aperture of the first through hole 12 is 0.8 - 1.2 mm, and the aperture of the second through hole 22 is 0.4 - 0.8 mm. In this embodiment, the aperture of the first through hole 12 is set to 1 mm, and the aperture of the second through hole 22 is set to 0.6 mm.

[0030] After injecting liquid, the sealing glue nail is first inserted into the liquid injection hole until the fillet transition structure 30 between the sealing joint 20 and the sealing seat 10 is completely inserted into the top end of the liquid injection hole to ensure initial liquid leakage prevention. Then, negative pressure helium is filled through covering the liquid injection hole. A film 11 of the sealing seat 10 seals the helium. Three vertical sections 21 are provided on the side wall of the upper part of the sealing joint 20 to ensure that helium quickly enters the battery housing through the gap between the vertical section 21 and the liquid injection hole. Then, the sealing glue nail is continuously inserted downward until the top end of the sealing seat 10 is located in the liquid injection hole of the lithium battery cover plate. The sealing seat 10 completely extends into the liquid injection hole of the lithium battery cover plate and has an interference fit with the liquid injection hole, ensuring the liquid sealing tightness of the sealing glue nail for the liquid injection hole. After laser welding with the upper sealing aluminum sheet, the film 11 on the sealing seat 10 is melted by the heat of the laser. If the welding quality is unqualified, the sealed helium can escape through the first through hole 12 and the second through hole 22, ensuring the accuracy of the helium leak detection equipment.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A sealing glue nail for leakage of liquid sealing in a lithium-ion battery, comprising a sealing seat (10) and a sealing joint (20), wherein the sealing seat (10) is connected to the top end of the sealing joint (20), and is characterized in that, The sealing seat (10) is subjected to film covering treatment, and the sealing seat (10) and the sealing joint (20) are provided with through holes.

2. The sealant nail for leakage of liquid in a lithium-ion battery according to claim 1, wherein The sealing seat (10) is provided with a first through hole (12), and the sealing joint (20) is provided with a second through hole (22). The first through hole (12) and the second through hole (22) are misaligned and communicated.

3. The sealant nail for leakage of liquid sealing in a lithium-ion battery according to claim 2, wherein The aperture of the first through hole (12) is larger than that of the second through hole (22).

4. The sealing adhesive nail for leakage of liquid sealing in a lithium-ion battery according to claim 3, wherein The aperture of the first through hole (12) is 0.8 - 1.2 mm.

5. The sealant nail for leakage of the sealing liquid of a lithium-ion battery according to claim 3, wherein The aperture of the second through hole (22) is 0.4 - 0.8 mm.

6. The sealing adhesive nail for leakage of the liquid sealing of a lithium ion battery according to claim 2, wherein The sealing joint includes a cylindrical upper part and an inverted conical boss-shaped lower part, and a plurality of vertical sections (21) are formed on the side wall of the upper part of the sealing joint.

7. The sealing adhesive nail for leakage of the liquid sealing of a lithium-ion battery according to claim 2, wherein, The first through hole (12) is arranged in the middle of the sealing seat (10).

8. The sealant nail for leakage of the liquid sealant of a lithium-ion battery according to claim 6, characterized in that, The second through hole is arranged in the vertical section (21) of the sealing joint (20).

9. The sealant nail for leakage of the liquid sealant of a lithium-ion battery according to claim 1, wherein The outer wall of the sealing seat (10) is an inverted conical surface, and the inclination angle of the conical surface is 1 - 5 degrees.

10. The sealant nail for leakage of the liquid sealant of a lithium-ion battery according to claim 1, wherein The sealing joint (20) and the sealing seat (10) are connected through a fillet structure (30).

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