A sealing structure for a liquid injection hole

Abstract

The utility model relates to battery liquid injection hole sealing technical field discloses a kind of liquid injection hole sealing structure, including steel column, colloidal particle body and substrate, wherein, the substrate is equipped with liquid injection hole;The inside hollow of colloidal particle body forms accommodating space and top has open mouth, the colloidal particle body is worn in the liquid injection hole, the outer edge of colloidal particle body and the top of the liquid injection hole abuts, colloidal particle body below has expansion part;The steel column is embedded from the open mouth place inside the accommodating space, and the steel column can drive the radial expansion of expansion part. By embedding the accommodating space of colloidal particle body with steel column and driving expansion part radial expansion, colloidal particle body is closely attached with liquid injection hole, improves sealing reliability, and by setting colloidal particle skirt edge reduces scratch and drops powder risk, avoids that electric core exists foreign matter.

Description

Technical Field

[0001] This utility model relates to the field of battery injection hole sealing technology, and in particular to an injection hole sealing structure. Background Technology

[0002] After the electrolyte filling process is completed, the filling hole of the battery cell needs to be sealed to prevent external moisture from entering the cell. For example, Chinese utility model patent CN223023563U discloses an integrated sealing nail. In this technical solution, sealing granules are used in conjunction with an aluminum sheet injection molding process for fixation. The injection hole and the sealing granules have an interference fit, which poses a risk of the sealing granules loosening outwards, leading to poor welding of the aluminum nail. Another example is Chinese utility model patent CN216354673U, which discloses a sealing structure for the filling hole using a rivet sealing method. In this technical solution, due to the influence of equipment positioning accuracy, the rivet may scrape and shed powder when it engages with the injection hole, resulting in a risk of foreign matter in the battery cell. Utility Model Content

[0003] To overcome at least one of the defects described in the prior art, this utility model provides a sealing structure for the injection hole. By embedding a steel column into the receiving space of the granule body and driving the expansion portion to expand radially, the granule body is made to fit tightly against the injection hole, improving sealing reliability. Furthermore, by setting a skirt for the granule, the risk of scratching and powder falling off is reduced, and foreign objects are avoided from being present in the battery cell.

[0004] The technical solution of this utility model is implemented as follows: A liquid injection hole sealing structure includes a steel column, a granule body, and a substrate. The substrate has a liquid injection hole. The granule body is hollow inside to form a receiving space and has an opening at the top. The granule body passes through the liquid injection hole and abuts against the outer edge of the top of the liquid injection hole. The granule body has an expansion portion below it. The steel column is embedded into the receiving space from the opening, and the steel column can drive the expansion portion to expand radially.

[0005] Based on the above technical solutions, preferably, the injection hole includes a positioning section and a through section, wherein the positioning section is located above the through section and the positioning section is coaxially arranged with the through section.

[0006] Based on the above technical solutions, preferably, the diameter of the positioning segment is larger than the diameter of the through segment.

[0007] Based on the above technical solutions, preferably, the granule body includes a granule skirt and a sealing granule, wherein the granule skirt is located on top of the sealing granule, and the diameter of the sealing granule is smaller than the diameter of the granule skirt, and the granule skirt abuts against the positioning segment.

[0008] Based on the above technical solutions, preferably, the expanded portion is located on the sealing granules.

[0009] Based on the above technical solutions, preferably, the sealing granules are made of elastic material.

[0010] Based on the above technical solutions, preferably, an insulating plastic is provided under the substrate, and the insulating plastic has avoidance holes to avoid the sealing particles.

[0011] Based on the above technical solutions, preferably, the height of the sealing granules is higher than the sum of the height of the clearance hole and the height of the through section.

[0012] Based on the above technical solutions, preferably, the steel column includes a first columnar segment, a second columnar segment, and a spherical segment, wherein the first columnar segment, the second columnar segment, and the spherical segment are arranged sequentially and integrally formed; the first columnar segment abuts against the rubber granule skirt; and the outer surface of the spherical segment abuts against the inner surface of the expanded portion.

[0013] Based on the above technical solutions, preferably, the diameter of the first columnar segment is larger than the diameter of the second columnar segment.

[0014] In summary, the injection hole sealing structure provided by this utility model has the following advantages over the prior art: (1) By embedding the steel column into the granule body's containment space and driving the expansion part to expand radially, the granule body is tightly fitted with the injection hole, which enhances the stability and reliability of the seal, effectively prevents external moisture from entering the cell, and ensures the cell's performance. (2) By setting the rubber granule skirt, foreign objects can be prevented from entering the cell after the steel column rubs against the injection hole; (3) Laser welding is not used in this application, which not only saves costs, but also reduces the risk of leakage caused by welding; (4) The granule body is provided with a granule skirt and a sealing granule, and the sealing granule is made of elastic material. The granule skirt abuts against the positioning section, and the elastic properties of the sealing granule are used to better achieve the sealing function. (5) The steel column adopts a structure in which the first columnar section, the second columnar section and the spherical section are arranged in sequence and integrally formed. The first columnar section abuts against the skirt of the granules, and the spherical section abuts against the inner surface of the expansion part. This design can more effectively transfer the embedding force of the steel column to the expansion part, so that the expansion part expands evenly and further optimizes the sealing effect. At the same time, the design that the diameter of the first columnar section is larger than the diameter of the second columnar section enhances the connection stability between the steel column and the granules body. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the planar structure of an embodiment of the present utility model; Figure 4 This is a schematic diagram of the three-dimensional structure of the steel column according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the granule body after expansion according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the granule body before expansion in an embodiment of this utility model; Figure 7 This is a schematic diagram of the injection hole and clearance hole in an embodiment of the present invention; The meanings of the reference numerals in the attached drawings are as follows: 1. Steel column; 11. First columnar segment; 12. Second columnar segment; 13. Spherical segment; 2. Granule body; 21. Receiving space; 22. Opening; 23. Expansion part; 24. Granule skirt; 25. Sealing granule; 3. Substrate; 31. Injection hole; 311. Positioning segment; 312. Through segment; 4. Insulating plastic; 41. Clearance hole. Detailed Implementation

[0017] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0018] See Figures 1-7 This utility model discloses a sealing structure for an injection hole 31, including a steel column 1, a granule body 2, a substrate 3, and an insulating plastic 4.

[0019] See Figure 1 and Figure 3As shown, in this embodiment, the insulating plastic 4 is located below the substrate 3. The insulating plastic 4 and the substrate 3 are integrally formed. Both the insulating plastic 4 and the substrate 3 are rectangular structures. The integrally formed structure makes the insulating plastic 4 and the substrate 3 form a whole, and the connection between them is more solid and can better withstand external forces.

[0020] See Figure 1 , Figure 2 and Figure 7 As shown, in this embodiment, a liquid injection hole 31 is provided on the substrate 3, the liquid injection hole 31 is located at the center of the substrate 3, and the liquid injection hole 31 is disposed through the substrate 3; a clearance hole 41 is provided on the insulating plastic 4, the clearance hole 41 is located at the center of the insulating plastic 4, and the clearance hole 41 is disposed through the insulating plastic 4; specifically, the liquid injection hole 31 includes a positioning section 311 and a through section 312, the positioning section 311 is located above the through section 312, and the positioning section 311 and the through section 312 are coaxially arranged, the diameter of the positioning section 311 is larger than the diameter of the through section 312, this design makes The injection hole 31 can be connected to the battery. The diameter of the positioning section 311 is larger than that of the through section 312, which facilitates its adaptation and fixation with other components. The positioning section 311 can better abut against the corresponding part of the granule body 2, forming an effective barrier to prevent impurities from falling in. Moreover, the avoidance hole 41 is coaxially connected to the injection hole 31, which facilitates the avoidance of the sealing granule 25. The avoidance hole 41 can be precisely matched according to the size and shape of the injection hole 31. Specifically, the diameter of the avoidance hole 41 is the same as that of the injection hole 31, which allows the granule body 2 to pass smoothly through the injection hole 31 and the avoidance hole 41 to achieve a good seal.

[0021] See Figure 5 and Figure 6As shown, in this embodiment, the internal cavity of the granule body 2 forms a receiving space 21, and the top is open 22. The granule body 2 passes through the injection hole 31, and the granule body 2 abuts against the outer edge of the top of the injection hole 31. The granule body 2 has an expansion portion 23 below it. Specifically, the granule body 2 includes a granule skirt 24 and a sealing granule 25. The granule skirt 24 is located on top of the sealing granule 25, and the diameter of the sealing granule 25 is smaller than the diameter of the granule skirt 24. The granule skirt 24 abuts against the positioning section 311, and the expansion portion 23 is located on the sealing granule 25. This design ensures that when the granule body 2 passes through the injection hole 31 and the top of the injection hole 31 is open 22, the granule body 2 is properly positioned. When the edges meet, the rubber granule skirt 24 can fit tightly against the surface of the positioning section 311, forming a sealing barrier. This can effectively prevent external moisture, dust and other impurities from entering the cell from the top of the injection hole 31. In this embodiment, the height of the sealing rubber granule 25 is higher than the sum of the height of the clearance hole 41 and the height of the through section 312. This design allows part of the sealing rubber granule 25 to be exposed outside the clearance hole 41. The expansion portion 23 below the rubber granule body 2 will expand radially after the steel column 1 is embedded, forming a tight radial seal with the inner wall of the injection hole 31. The contact between the rubber granule skirt 24 and the positioning section 311 forms an axial seal. The two work together to achieve a multi-level sealing effect.

[0022] Specifically, in this embodiment, the sealing granules 25 and the granule skirt 24 are both made of elastic material. The elastic material can be fluororubber or EPDM rubber. Elastic materials have good flexibility and deformability. When the sealing granules 25 and granule skirt 24 come into contact with the injection hole 31 and related components, they can elastically deform according to the shape of the contact surface, thus tightly adhering to the contact surface and forming an effective seal. This tight fit can effectively prevent electrolyte leakage and the entry of external moisture, dust, and other impurities into the battery cell. Both fluororubber and EPDM rubber have excellent chemical corrosion resistance. The electrolyte used inside the battery cell usually contains various chemical substances and has a certain degree of corrosiveness. The sealing granules 25 and granule skirt 24 made of these two elastic materials can resist the erosion of the electrolyte and are not prone to chemical reactions and deterioration over long-term use, thus ensuring the long-term stability of the sealing performance. This application does not use laser welding technology to avoid the aging problems caused by high-temperature welding of fluororubber or EPDM rubber, reducing the risk of battery cell leakage.

[0023] It should also be noted that, see reference Figure 6 As shown, when the steel column 1 is not embedded in the receiving space 21, the sealing granules 25 are cylindrical in shape. When the steel column 1 is embedded in the receiving space 21, refer to... Figure 5 As shown, the sealing granules 25 are spherical in shape, achieving a good fit with the steel column 1.

[0024] See Figure 4 As shown, in this embodiment, the steel column 1 is embedded into the receiving space 21 from the opening 22. The steel column 1 can drive the expansion portion 23 to expand radially. Specifically, the steel column 1 includes a first columnar segment 11, a second columnar segment 12, and a spherical segment 13. The first columnar segment 11, the second columnar segment 12, and the spherical segment 13 are arranged sequentially and integrally formed. The first columnar segment 11 abuts against the skirt 24 of the granule, and the outer surface of the spherical segment 13 abuts against the inner surface of the expansion portion 23. The diameter of the first columnar segment 11 is larger than the diameter of the second columnar segment 12, and the outer surface of the spherical segment 13 abuts against the inner surface of the expansion portion 23. When the steel column 1 is embedded into the receiving space 21 of the granule body 2, the spherical segment 13 can apply a uniform and effective radial force to the expansion portion 23. Due to the special shape of the spherical segment 13, the force can be more fully transmitted to the expansion portion 23, causing the expansion portion 23 to expand radially uniformly and tightly fit the inner wall of the injection hole 31, forming a reliable seal and effectively preventing electrolyte leakage and the entry of external impurities. Furthermore, the first columnar segment 11, the second columnar segment 12, and the spherical segment 13 are integrally formed, making the overall structure of the steel column 1 more stable. The smaller diameter of the second columnar segment 12 serves as a guide when the steel column 1 is embedded into the receiving space 21 of the granule body 2. It can enter the receiving space 21 first, providing accurate guidance for the subsequent embedding of the first columnar segment 11 and the spherical segment 13, allowing the steel column 1 to be smoothly and accurately embedded into the designated position, improving assembly efficiency and accuracy.

[0025] It should also be noted that in some other embodiments, the first columnar segment 11 and the second columnar segment 12 are assembled separately. The first columnar segment 11 needs to be in close contact with the rubber granule skirt 24 and withstand a certain axial force, and can be made of materials with high strength and good wear resistance. The second columnar segment 12 mainly plays a guiding and transitional role, and its material requirements may be relatively lower, so materials with lower cost and good processing performance can be selected. This diverse selection of materials can better meet the usage requirements under different working conditions.

[0026] The specific implementation steps are as follows: the granule body 2 is inserted into the injection hole 31 and the clearance hole 41, so that the granule skirt 24 abuts against the positioning section 311; the steel column 1 is embedded into the receiving space 21, and the first columnar section 11 abuts against the granule skirt 24; the spherical section 13 extends into the sealing granule 25 to cause the expansion part 23 to expand, thereby achieving a sealing effect.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing structure for an injection hole, characterized in that, It includes a steel column (1), a granule body (2), and a substrate (3), wherein, The substrate (3) has a liquid injection hole (31); The internal cavity of the granule body (2) forms a receiving space (21) and the top has an opening (22). The granule body (2) is inserted into the injection hole (31). The granule body (2) abuts against the outer edge of the top of the injection hole (31). The granule body (2) has an expansion portion (23) below. The steel column (1) is inserted into the receiving space (21) from the opening (22), and the steel column (1) can drive the expansion portion (23) to expand radially.

2. The injection hole sealing structure according to claim 1, characterized in that, The injection hole (31) includes a positioning section (311) and a through section (312), wherein, The positioning segment (311) is located above the through segment (312), and the positioning segment (311) and the through segment (312) are coaxially arranged.

3. The injection hole sealing structure according to claim 2, characterized in that, The diameter of the positioning segment (311) is larger than the diameter of the through segment (312).

4. The injection hole sealing structure according to claim 2, characterized in that, The granule body (2) includes a granule skirt (24) and a sealing granule (25), wherein, The granule skirt (24) is located on top of the sealing granule (25), and the diameter of the sealing granule (25) is smaller than the diameter of the granule skirt (24). The granule skirt (24) abuts against the positioning segment (311).

5. The injection hole sealing structure according to claim 4, characterized in that, The expanded portion (23) is located on the sealing granule (25).

6. The injection hole sealing structure according to claim 4, characterized in that, The sealing granules (25) are made of an elastic material.

7. The injection hole sealing structure according to claim 4, characterized in that, An insulating plastic (4) is provided below the substrate (3), and the insulating plastic (4) has a clearance hole (41) to avoid the sealing particles (25).

8. The injection hole sealing structure according to claim 7, characterized in that, The height of the sealing granules (25) is higher than the sum of the height of the clearance hole (41) and the height of the through section (312).

9. The injection hole sealing structure according to claim 4, characterized in that, The steel column (1) comprises a first columnar segment (11), a second columnar segment (12), and a spherical segment (13), wherein, The first columnar segment (11), the second columnar segment (12), and the spherical segment (13) are arranged sequentially and integrally formed; The first columnar segment (11) abuts against the skirt edge (24) of the granules; The outer surface of the spherical segment (13) abuts against the inner surface of the expanded portion (23).

10. The injection hole sealing structure according to claim 9, characterized in that, The diameter of the first columnar segment (11) is greater than the diameter of the second columnar segment (12).

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