Sealing structure and battery

Abstract

The present application relates to the technical field of battery sealing, and discloses a sealing structure and a battery. The sealing structure comprises: a cover plate, wherein an electrolyte injection hole runs through the cover plate in the thickness direction of the cover plate, and a hole wall located on the lower side of a hole opening of the electrolyte injection hole protrudes towards the center of the electrolyte injection hole to form a step structure; a sealing ring arranged corresponding to the hole opening of the electrolyte injection hole and arranged on the step structure; a sealing cover covering the hole opening of the electrolyte injection hole and arranged on the sealing ring; and a flanging boss protruding from the upper surface of the cover plate and surrounding the hole opening of the electrolyte injection hole, wherein the side of the flanging boss distant from the cover plate is folded inwards and riveted to the sealing cover, so that the sealing cover presses the sealing ring. In the present application, the sealing ring is used to seal the sealing cover and the electrolyte injection hole, and a laser welding process in the prior art is replaced with a flanging and riveting process, thereby achieving the limiting and fixing of the sealing cover and the compression of the sealing ring, and simplifying the sealing process; and the sealing process is simple and reliable, thereby reducing a failure risk.

Description

Sealing structure and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on March 7, 2024, with application number 202410259358.X and invention name “Sealing Structure and Battery”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery sealing technology, and in particular to a sealing structure and a battery. Background Art

[0004] After the battery is filled with liquid, the injection hole needs to be sealed. Conventional methods typically involve inserting a plastic nail into the injection hole, then covering it with an aluminum cover. This cover is then welded to the plain aluminum plate to seal the hole. However, this sealing method is complex, and the quality and uniformity of the weld between the aluminum cover and the plain aluminum plate are difficult to control, resulting in poor sealing reliability and a high risk of failure. Summary of the Invention

[0005] In view of this, the present application provides a sealing structure and a battery to solve the problems of the existing liquid filling hole sealing method, which has complicated procedures, difficult to control the quality and uniformity of the welding between the aluminum cover and the bare aluminum plate, poor sealing reliability, and high failure risk.

[0006] In the first aspect, the present application provides a sealing structure, comprising: a cover plate, with an injection hole provided through it along the thickness direction of the cover plate, and the hole wall located on the lower side of the opening of the injection hole protrudes toward the center of the injection hole to form a step structure; a sealing ring, arranged corresponding to the opening of the injection hole and arranged on the step structure; a sealing cover, covering the opening of the injection hole and arranged on the sealing ring; a flange boss, protruding from the upper surface of the cover plate and arranged around the opening of the injection hole, the flange boss is folded inwardly away from the side of the cover plate and riveted onto the sealing cover, so that the sealing cover presses the sealing ring; the folding length h of the flange boss is ≥1.5mm; the thickness of the flange boss is g, satisfying 0.3mm≤g≤5mm.

[0007] Beneficial effects: A sealing ring is used to seal between the sealing cover and the liquid injection hole, and a flanging riveting process is adopted instead of the laser welding process in the prior art to achieve the limiting fixation of the sealing cover and the compression of the sealing ring, which simplifies the sealing process. The sealing process is simple and reliable, and the risk of failure is reduced; the fixing strength of the sealing cover after riveting by the flanging boss is ensured, and the compression effect of the sealing ring is ensured; while facilitating the folding of the flanging boss, the fixing strength of the sealing cover after riveting by the flanging boss is ensured.

[0008] In an optional embodiment, the diameter of the sealing ring is Φa, satisfying Φa≥2mm.

[0009] Beneficial effect: ensuring that the sealing ring can achieve effective sealing.

[0010] In an optional embodiment, when the sealing cover is pressed, the compression amount of the sealing ring is d, which satisfies 20%≤d / Φa≤50%.

[0011] Beneficial effect: While ensuring that the sealing ring has sufficient sealing effect, it avoids the sealing ring from excessive compression failure.

[0012] In an optional embodiment, the distance between the inner ring of the sealing ring and the edge of the step structure is k, satisfying k>d+1mm.

[0013] Beneficial effect: The sealing ring is completely located on the step structure, which prevents the sealing ring from extending into the injection hole after compression and deformation, thereby avoiding affecting the sealing effect.

[0014] In an optional embodiment, the diameter of the sealing cover is Φe, and the orifice diameter of the liquid injection hole is Φf, satisfying 0<Φf-Φe≤0.5mm.

[0015] Beneficial effect: while ensuring that the sealing cover can be smoothly installed in the liquid injection hole, the sealing effect of the sealing ring is guaranteed.

[0016] In an optional embodiment, the diameter of the injection hole at the edge of the step structure is Φc, satisfying 1mm≤Φc≤10mm.

[0017] Beneficial effect: while ensuring the electrolyte injection speed, it avoids affecting the arrangement of other components on the cover.

[0018] In an optional embodiment, the thickness of the sealing cover is b, which satisfies 0.3 mm ≤ b ≤ 2 mm.

[0019] Beneficial effect: while ensuring that the sealing cover has sufficient structural strength, material waste is avoided.

[0020] In a second aspect, the present application also provides a battery comprising the above-mentioned sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] FIG1 is a top view of a sealing structure according to an embodiment of the present application;

[0023] FIG2 is a cross-sectional view taken along the AA direction in FIG1 ;

[0024] FIG3 is a partial enlarged schematic diagram of B in FIG2 ;

[0025] FIG4 is a schematic diagram of the exploded structure of the sealing structure in FIG1 .

[0026] Explanation of the accompanying reference numerals: 1. Cover plate; 101. Liquid injection hole; 102. Step structure; 2. Sealing ring; 3. Sealing cover; 4. Flanged boss. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0028] The following describes an embodiment of the present application in conjunction with FIG. 1 to FIG. 4 .

[0029] According to an embodiment of the present application, on the one hand, a sealing structure is provided, comprising: a cover plate 1, a sealing ring 2, a sealing cover 3 and a flanged boss 4. A liquid injection hole 101 is provided through the cover plate 1 in the thickness direction, and the hole wall located on the lower side of the opening of the liquid injection hole 101 protrudes toward the center of the liquid injection hole 101 to form a step structure 102. The sealing ring 2 is provided corresponding to the opening of the liquid injection hole 101 and is provided on the step structure 102, and the sealing cover 3 covers the opening of the liquid injection hole 101 and is provided on the sealing ring 2. The flanged boss 4 is provided protrudingly on the upper surface of the cover plate 1 and is provided around the opening of the liquid injection hole 101. The flanged boss 4 is folded inwardly on the side away from the cover plate 1 and is riveted onto the sealing cover 3, so that the sealing cover 3 presses the sealing ring 2.

[0030] A sealing ring 2 is used to seal between the sealing cover 3 and the liquid injection hole 101, and a flanging riveting process is used instead of the laser welding process in the prior art to achieve the limiting fixation of the sealing cover 3 and the compression of the sealing ring 2, which simplifies the sealing process. The sealing process is simple and reliable, reducing the risk of failure.

[0031] It is worth noting that in the related art, traditional sealant nails have a complex structure, high cost, and poor sealing effect. Sealing is achieved primarily by welding the aluminum cover to the bare aluminum plate. However, the welding process is complex and difficult to guarantee. Therefore, in this embodiment, the sealant nails are omitted and a standard sealing ring 2 commonly used on the market is used, which has a simple structure and low cost. In addition, the flanging riveting process is used instead of the welding process, simplifying the processing, reducing production costs, and improving production efficiency.

[0032] It should be noted that the sealing ring 2 is made of electrolyte-resistant material such as fluororubber to reduce corrosion of the sealing ring 2 by the electrolyte.

[0033] It should be noted that the sealing cover 3 is made of pressure-resistant, electrolyte-resistant, hard material, generally metal materials such as copper, aluminum, stainless steel, etc., and plastic materials such as PI, PPS, etc. can also be used.

[0034] In one embodiment, as shown in FIG3 , the folding length h of the flanged boss 4 is ≥ 1.5 mm, thereby ensuring the fixing strength of the flanged boss 4 on the sealing cover 3 after riveting and ensuring the compression effect on the sealing ring 2 .

[0035] It is worth noting that if the folding length h is too short, the fixing strength of the flange boss 4 to the sealing cover 3 and the sealing ring 2 after the flange riveting is insufficient, and the sealing ring 2 cannot be effectively compressed or the sealing cover 3 cannot be effectively fixed, which affects the sealing effect and the installation stability of the sealing cover 3.

[0036] In one embodiment, as shown in FIG3 , the thickness of the flanged boss 4 is g, which satisfies 0.3 mm ≤ g ≤ 5 mm. This facilitates folding of the flanged boss 4 while ensuring the fixing strength of the flanged boss 4 to the sealing cover 3 after riveting.

[0037] It is worth noting that if the thickness g of the flange boss 4 is too large, that is, the flange boss 4 is too thick, it will be inconvenient to operate the flange riveting process, affecting production efficiency; if the thickness g of the flange boss 4 is too small, that is, the flange boss 4 is too thin, the structural strength of the flange boss 4 itself will be too low, and it will be impossible to ensure effective fixation of the sealing cover 3 and effective compression of the sealing ring 2.

[0038] It is worth noting that the cover plate 1 and the flange boss 4 can be integrally formed.

[0039] In one embodiment, as shown in FIG3 , the diameter of the sealing ring 2 is Φa, which satisfies Φa ≥ 2 mm. This ensures that the sealing ring 2 can achieve effective sealing. In other words, if the sealing ring 2 is too small, the sealing effect is poor, affecting the sealing effect.

[0040] Of course, it is understandable that the sealing ring 2 does not need to be too large, as long as it can achieve effective sealing. If the sealing ring 2 is too large, it will not only waste materials and increase costs, but also increase the overall weight of the battery, which is not conducive to achieving lightweight batteries.

[0041] In one embodiment, as shown in FIG3 , under the pressure of the sealing cover 3 , the compression amount of the sealing ring 2 is d, which satisfies 20%≤d / Φa≤50%, thereby ensuring that the sealing ring 2 has sufficient sealing effect while avoiding failure due to excessive compression.

[0042] It is worth noting that d / Φa is the compression ratio of the sealing ring 2. If the compression ratio of the sealing ring 2 is too small, the sealing effect will be poor; if the compression ratio of the sealing ring 2 is too large, it will easily cause plastic deformation of the sealing ring 2, resulting in failure of the sealing ring 2.

[0043] In one embodiment, as shown in FIG3 , the distance between the inner ring of the sealing ring 2 and the edge of the stepped structure 102 is k, satisfying k>d+1 mm. This ensures that the sealing ring 2 is completely located on the stepped structure 102 to prevent the sealing ring 2 from extending into the injection hole 101 after compression and deformation, thereby preventing the sealing effect from being affected.

[0044] It is worth noting that if the step structure 102 cannot fully support the compressed sealing ring 2, it is easy to cause poor installation stability of the sealing ring 2 and fail to ensure effective sealing. In addition, the sealing ring 2 is prone to contact with the electrolyte, which can easily cause the sealing ring 2 to fail.

[0045] In one embodiment, as shown in FIG3 , the diameter of the sealing cap 3 is Φe, and the diameter of the opening of the liquid injection hole 101 is Φf, satisfying 0<Φf-Φe≤0.5mm. This ensures that the sealing cap 3 can be smoothly installed in the liquid injection hole 101 while ensuring the sealing effect of the sealing ring 2.

[0046] It is worth noting that the gap between the sealing cover 3 and the liquid injection hole 101 is matched to facilitate the installation of the sealing cover 3; however, if the gap between the sealing cover 3 and the liquid injection hole 101 is too large, the sealing ring 2 is compressed and deformed and squeezed into the gap, and the sealing ring 2 cannot effectively seal the gap.

[0047] In one embodiment, as shown in FIG3 , the diameter of the injection hole 101 at the edge of the step structure 102 is Φc, satisfying 1mm≤Φc≤10mm, so as to ensure the electrolyte injection speed while avoiding affecting the arrangement of other components on the cover plate 1 .

[0048] It is worth noting that if the aperture of the injection hole 101 is too small, it will be unfavorable for the inflow of electrolyte, resulting in a slowdown in the injection speed and affecting production efficiency; if the aperture of the injection hole 101 is too large, the injection hole 101 occupies too much space on the cover plate 1, and the remaining space on the cover plate 1 is reduced, which is not conducive to the layout of other components.

[0049] In one embodiment, as shown in FIG3 , the thickness of the sealing cover 3 is b, which satisfies 0.3 mm ≤ b ≤ 2 mm, thereby ensuring that the sealing cover 3 has sufficient structural strength while avoiding material waste.

[0050] It is worth noting that if the thickness b of the sealing cover 3 is too small, that is, the sealing cover 3 is too thin, the structural strength of the sealing cover 3 itself is insufficient, and it is easy to deform or even break, and the reliability is low; if the thickness b of the sealing cover 3 is too large, that is, the sealing cover 3 is too thick, the material required to manufacture the sealing cover 3 increases, resulting in material waste, leading to increased production costs, and the occupied space increases, resulting in space waste.

[0051] According to an embodiment of the present application, on the other hand, a battery is provided, comprising the above-mentioned sealing structure.

[0052] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A sealing structure, characterized in that: include: A cover plate is provided with a liquid injection hole along the thickness direction of the cover plate, and the hole wall located on the lower side of the hole opening of the liquid injection hole protrudes toward the center of the liquid injection hole to form a step structure; a sealing ring, arranged corresponding to the opening of the liquid injection hole and arranged on the step structure; A sealing cover, which covers the opening of the liquid injection hole and is arranged on the sealing ring; A flanged boss protrudes from the upper surface of the cover plate and is arranged around the opening of the liquid injection hole. The side of the flanged boss away from the cover plate is folded inward and riveted onto the sealing cover so that the sealing cover presses the sealing ring; The folding length h of the flanging boss is ≥ 1.5 mm; The thickness of the flanging boss is g, which satisfies 0.3mm≤g≤5mm.

2. The sealing structure according to claim 1, wherein: The diameter of the sealing ring is Φa, which satisfies Φa≥2mm.

3. The sealing structure according to claim 2, characterized in that: When the sealing cover is pressed, the compression amount of the sealing ring is d, which satisfies 20%≤d / Φa≤50%.

4. The sealing structure according to claim 3, characterized in that: The distance between the inner ring of the sealing ring and the edge of the step structure is k, and k>d+1 mm is satisfied.

5. The sealing structure according to any one of claims 1 to 4, characterized in that: The diameter of the sealing cover is Φe, and the diameter of the opening of the liquid injection hole is Φf, which satisfies 0<Φf-Φe≤0.5mm.

6. The sealing structure according to any one of claims 1 to 4, characterized in that: The diameter of the injection hole at the edge of the step structure is Φc, which satisfies 1mm≤Φc≤10mm.

7. The sealing structure according to any one of claims 1 to 4, characterized in that: The thickness of the sealing cover is b, which satisfies 0.3 mm ≤ b ≤ 2 mm.

8. A battery, characterized in that: The sealing structure comprises the sealing structure according to any one of claims 1 to 7.

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