Sealing structure and battery

Abstract

The utility model discloses a sealing structure in the field of battery packaging and manufacturing, and the sealing structure is used for sealing a cover plate and comprises a sealing element, a first limiting part is arranged on one surface of the sealing element; a through hole of which the inner diameter is smaller than or equal to that of the liquid injection hole in the cover plate is formed in the transition piece; a second limiting part is arranged on one surface of the transition piece; a third limiting part and a fourth limiting part are arranged on the outer surface of the cover plate, the third limiting part is matched with the first limiting part, and the fourth limiting part is matched with the second limiting part; the second limiting part is matched with the fourth limiting part, so that the through hole is formed in the section of the liquid injection hole or is matched with the liquid injection hole; the first limiting part is matched with the fourth limiting part, so that the sealing piece covers the liquid injection hole; during use, the transition piece can prevent electrolyte from being left on the surface of the cover plate, the pollution degree of the electrolyte on the surface of the battery is effectively reduced, high-precision matching of the sealing piece and the cover plate is facilitated, and final precision welding is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packaging and manufacturing, and in particular to a sealing structure and a battery. Background Art

[0002] In the existing battery cover structure, the rubber plug in the rubber nail is partially interference fit to plug the injection hole, and then a metal sealing nail is covered after the rubber nail is plugged in. The sealing nail is then welded to the cover to form an internal seal, and the sealing nail is welded to the injection countersunk hole on the cover to form an external seal for the rubber nail. Therefore, the welding process of the power battery injection hole and the sealing nail is crucial in the battery production process, and the quality of the welding can affect the final yield and performance of the power battery. At present, the welding process has the following problems:

[0003] (1) Electrolyte is likely to remain around the injection hole, affecting the welding effect;

[0004] (2) Laser cleaning before welding can only clean electrolyte crystals with a small amount of residual electrolyte, but cannot clean a large amount of residual electrolyte crystals;

[0005] (3) The electrolyte needs to be cleaned manually, the degree of cleaning is inconsistent and long-term work is harmful to the human body.

[0006] Incomplete removal of the electrolyte may result in low precision welding of the final sealing pin. Utility Model Content

[0007] The purpose of the present application is to provide a method for solving the problem of electrolyte residue on the battery surface during canning in the prior art, so as to ensure stable welding of the final sealing plate.

[0008] In order to solve the above technical problems, this application is implemented by adopting the following technical solutions:

[0009] In a first aspect, a sealing structure is provided for anastomosis with a cover plate; comprising

[0010] A transition piece is provided with a through hole whose inner diameter is less than or equal to the inner diameter of the injection hole on the cover plate; and a second limiting portion is provided on one side of the transition piece;

[0011] The outer surface of the cover plate is provided with a fourth limiting portion, and the fourth limiting portion matches the second limiting portion, so that the through hole is placed in the cross section of the injection hole or matches the injection hole.

[0012] According to a further solution of the present application, the transition member is provided with a third positioning body coplanar with the second limiting portion, the outer surface of the cover plate is provided with a second positioning body, and the third positioning body matches the second positioning body.

[0013] In a further solution, the second positioning body is a chamfered groove provided on the outer surface of the cover plate, and the third positioning body is a second hollow cone integrally installed on one side of the transition piece, and a second circular recessed groove is formed between the second hollow cone and the transition piece.

[0014] In a further embodiment, the second circular groove and the through hole are coaxially arranged.

[0015] In a second aspect, a sealing structure is provided for closing a cover plate; comprising

[0016] A sealing member, one side of which is provided with a first limiting portion;

[0017] The outer surface of the cover plate is provided with a third limiting portion, and the fourth limiting portion matches the second limiting portion so that the sealing member covers the liquid injection hole.

[0018] According to a further solution of the present application, a first positioning body coplanar with the first limiting portion is provided on the sealing member, and a second positioning body is provided on the outer surface of the cover plate, and the first positioning body matches the second positioning body.

[0019] In a further solution, the first positioning body is a first hollow cone integrally installed on one side of the seal, the hollow cone and the seal form a first circular groove coplanar with the first limiting portion, and the second positioning body is a chamfered groove provided on the outer surface of the cover plate.

[0020] In a further solution, a second limiting member is further provided in the circumferential direction of the sealing member, a coaxial second recessed groove and a first recessed groove are provided outside the cover plate, the first recessed groove is placed in the second recessed groove, and the second limiting member matches the second recessed groove.

[0021] In a third aspect, a battery comprises a battery body, on which the above-mentioned sealing structure is installed.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] When the present application is used, the transition piece is fitted and placed on the injection hole of the cover plate. When the injection nozzle on the injection tool injects electrolyte into the injection hole, no electrolyte will remain on the surface of the cover plate, which effectively reduces the degree of contamination of the battery surface by the electrolyte and eliminates the laser cleaning process. Compared with traditional electrolyte cleaning, it saves manpower and reduces production costs. After that, the transition piece is removed and the sealing piece is placed. It is effectively positioned with the cooperation of the first limit part and the third limit part to ensure subsequent precise welding.

[0024] In addition, the first limiting portion on the seal is a plurality of annular protrusions, and the third limiting portion is a first recessed groove 8 and a plurality of annular grooves, so that the seal is placed on the cover plate and is circumferentially limited, positioning is more precise, and the final sealing accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional schematic diagram of a sealing member in an embodiment of the present application;

[0026] Figure 2 is a cross-sectional schematic diagram of a transition member in an embodiment of the present application;

[0027] Figure 3 is a front plan view of the transition piece in the embodiment of the present application;

[0028] Figure 4 is a partial cross-sectional schematic diagram of a cover plate in an embodiment of the present application;

[0029] Figure 5 It is a partial cross-sectional schematic diagram of the combination of the sealing member and the cover plate in the embodiment of the present application.

[0030] Among them, 100, sealing member; 200, transition member; 300, cover plate; 1, first protrusion; 2, second protrusion; 3, third protrusion; 4, first circular groove; 5, circular protrusion; 6, through hole; 7, second sink; 71, first sink; 8, first groove; 9, second groove; 10, third groove; 11, second positioning body; 12, injection hole; 13, first positioning body; 14, fourth protrusion; 15, fifth protrusion; 16, sixth protrusion; 17, third positioning body, 61, second circular groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use.

[0032] Reference Figures 1 to 3 This embodiment discloses a sealing structure for sealing a cover plate 300, using a sealing member 100 and a transition member 200;

[0033] The sealing member 100 has a first limiting portion on one side; the transition member 200 has a through hole 6 whose inner diameter is less than or equal to the inner diameter of the injection hole 12 on the cover plate 300; and the transition member has a second limiting portion on one side;

[0034] A third limiting portion and a fourth limiting portion are provided on the outer surface of the cover plate 300. The third limiting portion matches the first limiting portion, and the fourth limiting portion matches the second limiting portion. The second limiting portion cooperates with the fourth limiting portion so that the through hole 6 is placed in the cross-section of the injection hole 12 or coincides with the injection hole 12. The first limiting portion cooperates with the fourth limiting portion so that the seal 100 closes the injection hole 12.

[0035] When in use, by covering the transition piece 200 on the injection hole 6 of the cover plate 300, the electrolyte will not remain on the surface of the cover plate 300 during the actual electrolyte injection process, ensuring the simplicity of the sealing part of the cover plate 300, thereby ensuring that the final sealing member 100 passes through the first limiting part and the third limiting part with high precision.

[0036] The relevant structures in this embodiment are described in detail below in conjunction with the relevant drawings;

[0037] Reference Figure 1 , the sealing member 100 in this embodiment is a sealing nail, and the first limiting portion on the sealing member 100 is a plurality of protrusions, specifically a first protrusion 1, a second protrusion 2, and a third protrusion 3. The first protrusion 1 is located at the outermost side of the sealing nail, and plays a role in preventing the outermost liquid from penetrating into the center. A groove is formed between the second protrusion 2 and the first protrusion 1, and a groove is formed between the third protrusion 3 and the second protrusion 2. A first positioning body 13 is also axially arranged at the center of the sealing member 100. The first positioning body is a first hollow truncated cone integrally mounted on one side of the sealing member 100. The first hollow truncated cone and the plurality of protrusions are coplanar. The first hollow truncated cone and the sealing member 100 form a first circular groove 4. A circular protrusion 5 is provided on the edge of the sealing member 100, and its function is to prevent the edge from deforming and warping due to welding stress during welding. The shape of the circular protrusion 5 can be a threaded shape or an arc shape. In actual production, the heights of the first protrusion 1, the second protrusion 2, and the third protrusion 3 can be manufactured and adjusted according to the leakage of the edge chamfer of the first circular groove 4.

[0038] Reference Figure 2 , 3 The transition piece 200 in this embodiment is a liquid injection hole pressing block, a through hole 6 is provided in the middle of the transition piece 200, and a second limiting portion is provided on the edge. The second limiting portion in this embodiment has the same structure as the first limiting portion on the sealing member 100, and the second limiting portion is specifically the fourth protrusion 14, the fifth protrusion 15, and the sixth protrusion 16; the first limiting portion and the second limiting portion coincide with each other on the projection surface of the sealing member 100 onto the transition piece 200, that is, the relative installation positions of the first limiting portion and the second limiting portion are the same. It should be noted here that the sealing member 100 and the transition piece 200 in this embodiment have the same size, wherein the diameter of the through hole 6 is equal to the diameter of the liquid injection hole 12 of the cover plate 300, and a third positioning body 17 is also provided on the transition piece 200 at the edge of the through hole 6, and the third positioning body 17 is a second hollow cone, and a second circular sink groove 61 is provided between the third positioning body 17 and the through hole 6.

[0039] Reference Figure 4The cover plate 300 in this embodiment is the cover plate on the battery. The outer surface of the cover plate 300 is provided with a coaxial second groove 7 and a first groove 71 from top to bottom. The third limiting part and the fourth limiting part are arranged at the bottom of the first groove 71, and the third limiting part and the fourth limiting part are arranged in the same body, that is, the two are of the same structure, specifically the first groove 8, the second groove 9, and the third groove 10. These three grooves are all annular and correspond one to one to the three protrusions on the seal 100. The edge of the injection hole 12 of the cover plate 300 is provided with a second positioning body 11, which is specifically a chamfered groove in this embodiment. The slope of the bevel of the chamfered groove matches the slope of the bevel of the hollow truncated cone on the seal 100 and the transition member 200. The second positioning body 11 is a key design to prevent the electrolyte from entering the first groove 8, the second groove 9 and the third groove 10. Similarly, the third groove 10 is the second protection, the second groove 9 is the third protection, and the first groove 8 is located at the edge, and its main function is to prevent external impurities from entering.

[0040] Preferably, the seal 100 is an aluminum sealing pin with good welding effect and high welding yield, maintaining the sealing of the battery; the transition piece 200 can be aluminum shell gold or a plastic material with good elasticity to ensure a tight fit between the first groove 8, the second groove 9, the third groove 10 and the first protrusion 1, the second protrusion 2, and the third protrusion 3.

[0041] Specific use:

[0042] The transition piece 200 and the injection hole 6 of the cover plate 300 are tightly fitted before the battery is injected, and the injection nozzle can be fitted on the surface of the transition piece 200 to isolate the injection nozzle from direct contact with the injection hole 6 of the cover plate 300.

[0043] Before welding the seal 100, the transition piece 200 is sucked away by a suction cup, and then the seal 100 is embedded into the cover plate 300. Figure 5 The assembled state of the sealing member 100 and the cover plate 300 can be seen.

[0044] If electrolyte is not found to enter between the third groove 10 and the second positioning body 11 (chamfered groove) during the injection process, welding can be performed between the two. The method for detecting whether liquid has entered can be to detect the height or shape of the third groove 10 and the second positioning body 11 through visual inspection or a profilometer. Once one of the third groove 10 and the second positioning body 11 is detected to be abnormal in height or shape, it can be determined that there is leakage contamination, otherwise there is no leakage contamination.

[0045] The height or shape of the first groove 8, the second groove 9, the third groove 10 and the second positioning body 11 is visually inspected to determine the welding position; first determine that there is no abnormality in the height or shape of the third groove 10 and the second positioning body 11, and then perform sealing welding on the platform area between the two; (It should be noted here that the welding method is penetration welding, and laser welding is used to penetrate the seal 100 to achieve a tight combination of the two), if one of the two is abnormal, observe the second groove 9 and the third groove 10, if there is no abnormality, perform sealing welding on the platform area between the second groove 9 and the third groove 10; finally, if there are abnormalities in the observation of both the third groove 10 and the second positioning body 11, observe the first groove 8 and the second groove 9, and perform sealing welding on the platform between the first groove 8 and the second groove 9.

[0046] Before the sealing welding of the seal 100 and the cover plate 300, spot welding is performed at the second sink groove 7, which is used to prevent the seal 100 (sealing pin) from deforming and warping during the full welding process. Another advantage of the sink groove is that it can achieve the purpose of fixation with the help of structural limitation.

[0047] It is known from common technical knowledge that the present application can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present application or within the scope equivalent to the present application are included in the present application.

Claims

1. A sealing structure for anastomosis cover plate (300); characterized in that: Including transition pieces (200); The transition piece (200) is provided with a through hole (6) whose inner diameter is less than or equal to the inner diameter of the injection hole (12) on the cover plate (300); and a second limiting portion is provided on one side of the transition piece (200); The outer surface of the cover plate (300) is provided with a fourth limiting portion, the fourth limiting portion matching the second limiting portion, so that the through hole (6) is placed within the cross section of the liquid injection hole (12) or matches the liquid injection hole (12).

2. The sealing structure according to claim 1, characterized in that: The transition member (200) is provided with a third positioning body (17) coplanar with the second limiting portion, and the outer surface of the cover plate (300) is provided with a second positioning body (11), and the third positioning body (17) matches the second positioning body (11).

3. The sealing structure according to claim 2, characterized in that: The second positioning body (11) is a chamfered groove provided on the outer surface of the cover plate (300), and the third positioning body (17) is a second hollow truncated cone integrally installed on one side of the transition piece (200), and a second circular recessed groove (61) is formed between the second hollow truncated cone and the transition piece (200).

4. The sealing structure according to claim 3, characterized in that: The second circular recess (61) and the through hole (6) are coaxially arranged.

5. A sealing structure for sealing a cover plate (300); characterized in that: including a seal (100); The sealing member (100) is provided with a first limiting portion on one side; The outer surface of the cover plate (300) is provided with a third limiting portion, and the fourth limiting portion matches the second limiting portion, so that the sealing member (100) covers the liquid injection hole (12).

6. The sealing structure according to claim 5, characterized in that: The sealing member (100) is provided with a first positioning body (13) coplanar with the first limiting portion, and the outer surface of the cover plate (300) is provided with a second positioning body (11), and the first positioning body (13) and the second positioning body (11) are matched.

7. The sealing structure according to claim 6, characterized in that: The first positioning body (13) is a first hollow truncated cone integrally mounted on one side of the sealing member (100), the hollow truncated cone and the sealing member (100) forming a first circular groove (4) coplanar with the first limiting portion, and the second positioning body (11) is a chamfered groove provided on the outer surface of the cover plate (300).

8. The sealing structure according to claim 6, characterized in that: The sealing member (100) is also provided with a second stopper (5) in the circumferential direction, the cover plate (300) is provided with a coaxial second recessed groove (7) and a first recessed groove (71) on the outside, the first recessed groove (71) is disposed in the second recessed groove (7), and the second stopper (5) matches the second recessed groove (7).

9. A battery, characterized in that: It comprises a battery body, on which the sealing structure according to any one of claims 1 to 8 is installed.

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