CN219017883U - Anti-drop structure of sealant nail - Google Patents

Abstract

The utility model relates to the technical field of liquid injection port sealing of lithium ion secondary batteries, in particular to a sealing glue nail anti-falling structure, which comprises a sealing glue nail, a metal sealing nail and a battery core top cover, wherein a liquid injection hole is formed in the battery core top cover; the utility model provides the anti-falling structure of the sealant nail, which has the advantages of simple structure and low manufacturing cost and can prevent the sealant nail from falling off.

Description

Anti-drop structure of sealant nail

Technical Field

The utility model relates to the technical field of sealing of a liquid injection port of a lithium ion secondary battery, in particular to an anti-falling structural member of a sealant nail.

Background

The lithium ion battery as a novel secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and is widely applied to the fields of portable electric appliances, electric tools, large-scale energy storage, electric traffic power sources and the like. The lithium ion battery mainly comprises a positive electrode, a negative electrode, a diaphragm and electrolyte, and in the production process, a small through hole is usually formed on a top cover of an aluminum shell battery cell by direct processing and is used as a liquid injection hole for battery cell liquid injection and liquid supplement.

After the cell is injected with the liquid, in order to ensure the tightness of the liquid injection hole, a sealing glue nail is generally inserted, and then the metal sealing nail is welded by laser to perform sealing twice. Because the sealant nail is mainly made of plastic materials, electrolyte can contact the sealant nail in the capacity-dividing and subsequent use processes of the lithium ion battery, and the sealant nail can be corroded, aged and deformed by the electrolyte in the long time, so that the sealant nail falls into the battery core from the liquid injection hole. Once the sealant nail falls off, the liquid leakage occurs in the liquid injection hole, so that the service life of the lithium ion battery is influenced, and potential safety hazards are caused.

Disclosure of Invention

The utility model aims to overcome the defects and the shortcomings of the prior art and provide the anti-falling structure of the sealant nail, which has the advantages of simple structure and low manufacturing cost and can prevent the sealant nail from falling off.

The technical scheme for realizing the aim of the utility model is as follows: the utility model provides a sealed nail anti-drop structure, includes sealed nail, metal seal nail and electric core top cap, the notes liquid hole has been seted up on the electric core top cap, locate in sealed nail and the metal seal nail and annotate the liquid hole, the metal seal nail is located the top of sealed nail, cage structure is installed to the bottom surface of electric core top cap, cage structure is open-top's hollow structure, annotate the liquid hole and include welding part and sealing part, metal seal nail welds in welding part, sealed nail and sealing part interference fit, sealed part entering cage structure is stretched out to sealed bottom of gluing the nail to by cage structure pocket.

Further, a plurality of pore canals are formed in the cage-shaped structure and used for injecting electrolyte into the battery cell.

Further, the pore canal on the side wall of the cage-shaped structure is obliquely arranged, and the end part of the pore canal, which is close to the sealant nail, is higher than the end part, which is far away from the sealant nail.

Further, the inclination angle of the pore canal on the side wall of the cage-shaped structure is 30-60 degrees.

Further, the welding part is in a step shape, the metal sealing nail is in a shape of , a top cap of the metal sealing nail is supported and welded on the step, and a tail of the metal sealing nail abuts against the top of the sealing glue nail.

Further, the top end of the cage-shaped structure and the bottom surface of the battery cell top cover are integrally formed.

Further, the inner wall of the cage-shaped structure is provided with a plurality of annular sealing elements, and the annular sealing elements are in interference fit with the sealant nails.

Further, the cross section of the annular sealing element is barb-shaped, and the inclination angle of the annular sealing element is 30-60 degrees.

Further, the bottom section of the sealant nail is in an inverted trapezoid shape.

Further, the diameter of the sealant nail is 3.10 plus or minus 0.05mm, the length is 7.55-7.75mm, the height of the cage-shaped structure is 8.00-8.60mm, the wall thickness is 1.10-1.30mm, the diameter of the pore canal on the side wall of the cage-shaped structure is 3.70 plus or minus 0.05mm, and the diameter of the pore canal on the bottom wall is 1.80 plus or minus 0.05mm.

After the technical scheme is adopted, the utility model has the following positive effects:

(1) According to the utility model, the sealing glue nails are held from the bottom of the sealing glue nails through the arrangement of the cage-shaped structure, so that the sealing glue nails can not fall off even after being contacted with electrolyte for a long time, and meanwhile, the cage-shaped structure plays a certain role in protecting the sealing glue nails, so that the contact between the sealing glue nails and the electrolyte is reduced, the tightness of the liquid injection holes is ensured, and the leakage is avoided;

(2) According to the utility model, the pore canal on the side wall of the cage-shaped structure is obliquely arranged, so that electrolyte can enter the battery cell more smoothly through the pore canal, and the electrolyte in the battery cell is not easy to enter the cage-shaped structure from the battery cell, thereby further reducing the contact between the sealant nails and the electrolyte;

(3) According to the utility model, through the arrangement of the annular sealing piece, the sealing glue nails are prevented from being ejected out by gas generated in the battery cell in the use process, and the sealing performance of the liquid injection holes is improved.

Drawings

In order that the utility model may be more readily and clearly understood, a further detailed description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings, in which:

FIG. 1 is a schematic structural diagram of embodiment 1 of the present utility model;

FIG. 2 is a schematic view of a liquid injection hole according to the present utility model;

FIG. 3 is a schematic view of a metallic seal spike of the system of the present utility model;

FIG. 4 is a schematic structural diagram of embodiment 2 of the present utility model;

fig. 5 is a schematic structural diagram of embodiment 3 of the present utility model.

In the figure: 1. sealing glue nails; 2. a metal sealing nail; 2a, a nail cap; 2b, nailing the tail; 3. a top cover of the battery cell; 4. a liquid injection hole; 4a, a welding part; 4b, a sealing part; 5. a cage-like structure; 6. a duct; 7. an annular seal.

Detailed Description

Example 1

As shown in fig. 1-3, a sealant nail anti-falling structure comprises a sealant nail 1, a metal sealant nail 2 and a battery core top cover 3, wherein a liquid injection hole 4 is formed in the battery core top cover 3, the sealant nail 1 and the metal sealant nail 2 are arranged in the liquid injection hole 4, the metal sealant nail 2 is located above the sealant nail 1, a cage-shaped structure 5 is arranged on the bottom surface of the battery core top cover 3, the cage-shaped structure 5 is a hollow structure with an open top, the liquid injection hole 4 comprises a welding part 4a and a sealing part 4b, the metal sealant nail 2 is welded on the welding part 4a, the sealant nail 1 is in interference fit with the sealing part 4b, and the sealing part 4b extends out of the bottom of the sealant nail 1, enters the cage-shaped structure 5 and is covered by the cage-shaped structure 5. Through the setting of cage-like structure 5, hold sealed glue nail 1 from its bottom pocket for sealed glue nail 1 can not drop even after contacting with the electrolyte for a long time, and cage-like structure 5 plays certain guard action to sealed glue nail 1 simultaneously, reduces the contact of sealed glue nail 1 and electrolyte, thereby has guaranteed the leakproofness of annotating liquid hole 4, avoids appearing the weeping. Specifically, the bottom end section of the sealant nail 1 is in an inverted trapezoid shape, so that the sealant nail 1 is conveniently inserted into the sealing part 4b, the welding part 4a is in a step shape, the metal sealant nail 2 is in a shape, the nail cap 2a of the metal sealant nail 2 is supported and welded on a step, the nail tail 2b of the metal sealant nail 2 is propped against the top of the sealant nail 1, the metal sealant nail 2 is welded with the welding part 4a, and the top end of the sealant nail 1 is in interference fit with the sealing part 4b, so that the sealing of the liquid injection hole 4 is realized; the top end of the cage-shaped structure 5 and the bottom surface of the battery cell top cover 3 are integrally formed, so that the stability of connection of the cage-shaped structure 5 and the battery cell top cover 3 is ensured.

The cage-like structure 5 is provided with a plurality of pore canals 6 for injecting electrolyte into the battery cell. Specifically, the pore channels 6 are distributed on the side wall and the bottom wall of the cage-shaped structure 5, the diameter of the pore channels 6 on the side wall is 3.70mm, and the diameter of the pore channels 6 on the bottom wall is 1.82mm.

In this embodiment, the diameter of the sealant nail 1 is 3.12mm, the length is 7.6mm, the height of the cage structure 5 is 8.03mm, and the wall thickness is 1.20mm. Through experiments, the anti-falling structural member in the embodiment is adopted, and the sealant nail 1 on the battery cell does not fall off for at least 15 years.

Example 2

As shown in fig. 4, the present embodiment improves the pore canal 6 on the side wall of the cage-shaped structure 5 on the basis of embodiment 1, the pore canal 6 on the side wall of the cage-shaped structure 5 is obliquely arranged, and the end of the pore canal 6 close to the sealant nail 1 is higher than the end of the end far away from the sealant nail 1, so that the electrolyte can enter the battery cell through the pore canal 6 more smoothly when the electrolyte is injected, and the electrolyte in the battery cell is not easy to enter the cage-shaped structure 5, thereby further reducing the contact between the sealant nail 1 and the electrolyte. Specifically, the inclination angle of the pore canal 6 on the side wall of the cage-shaped structure 5 is 30 degrees to 60 degrees.

Example 3

As shown in fig. 5, in this embodiment, an annular sealing member 7 is added on the basis of embodiment 1 or embodiment 2, and a plurality of annular sealing members 7 are provided on the inner wall of the cage-like structure 5, and the annular sealing members 7 are in interference fit with the sealant nails 1. Through the setting of annular seal 7, when preventing that the gas that produces in the cell in the use from pushing up out sealant nail 1, improved the leakproofness to annotating liquid hole 4. Specifically, the cross section of the annular sealing element 7 is barb-shaped, the inclination angle of the annular sealing element 7 is 30-60 degrees, the spike part of the annular sealing element 7 faces the sealing glue nail 1 and is abutted against the sealing glue nail 1, and the vertical length of the annular sealing element 7 is 0.9mm.

While the foregoing is directed to embodiments of the present utility model, other and further details of the utility model may be had by the present utility model, it should be understood that the foregoing description is merely illustrative of the present utility model and that no limitations are intended to the scope of the utility model, except insofar as modifications, equivalents, and improvements may be made within the spirit and principles of the utility model.

Claims (10)

1. The utility model provides a sealed nail anti-drop structure, includes sealed nail (1), metal seal nail (2) and electric core top cap (3), annotate liquid hole (4) have been seted up on electric core top cap (3), locate in sealed nail (1) and metal seal nail (2) annotate liquid hole (4), metal seal nail (2) are located the top of sealed nail (1), its characterized in that: the battery cell top cap (3) is characterized in that a cage-shaped structure (5) is arranged on the bottom surface of the battery cell top cap (3), the cage-shaped structure (5) is a hollow structure with an open top, the liquid injection hole (4) comprises a welding part (4 a) and a sealing part (4 b), the metal sealing nail (2) is welded on the welding part (4 a), the sealing glue nail (1) is in interference fit with the sealing part (4 b), and the sealing part (4 b) stretches out of the bottom of the sealing glue nail (1) to enter the cage-shaped structure (5) and is covered by the cage-shaped structure (5).

2. The sealant nail fall-off prevention structure according to claim 1, wherein: and a plurality of pore channels (6) are formed in the cage-shaped structure (5) and are used for injecting electrolyte into the battery cell.

3. The sealant nail fall-off prevention structure according to claim 2, wherein: the pore canal (6) on the side wall of the cage-shaped structure (5) is obliquely arranged, and the end part of the pore canal (6) close to the sealant nail (1) is higher than the end part far away from the sealant nail (1).

4. A sealant nail fall-off prevention structure according to claim 3, wherein: the inclination angle of the pore canal (6) on the side wall of the cage-shaped structure (5) is 30-60 degrees.

5. The sealant nail fall-off prevention structure according to claim 2, wherein: the welding part (4 a) is in a step shape, the metal sealing nail (2) is in a shape of , the nail cap (2 a) of the metal sealing nail (2) is supported and welded on the step, and the tail (2 b) of the metal sealing nail (2) abuts against the top of the sealing glue nail (1).

6. The sealant nail fall-off prevention structure according to claim 5, wherein: the top end of the cage-shaped structure (5) and the bottom surface of the battery core top cover (3) are integrally formed.

7. A sealant nail fall-off prevention structure according to any one of claims 1 to 6, wherein: the inner wall of the cage-shaped structure (5) is provided with a plurality of annular sealing elements (7), and the annular sealing elements (7) are in interference fit with the sealant nails (1).

8. The sealant nail fall-off prevention structure according to claim 7, wherein: the cross section of the annular sealing piece (7) is barb-shaped, and the inclination angle of the annular sealing piece (7) is 30-60 degrees.

9. The sealant nail fall-off prevention structure according to claim 1, wherein: the cross section of the bottom end of the sealant nail (1) is in an inverted trapezoid shape.

10. The sealant nail fall-off prevention structure according to claim 4, wherein: the diameter of the sealant nail (1) is 3.10+/-0.05 mm, the length of the sealant nail is 7.55-7.75mm, the height of the cage-shaped structure (5) is 8.00-8.60mm, the wall thickness of the sealant nail is 1.10-1.30mm, the diameter of the pore channel (6) on the side wall of the cage-shaped structure (5) is 3.70+/-0.05 mm, and the diameter of the pore channel (6) on the bottom wall is 1.80+/-0.05 mm.

Images