Lithium battery top cover with multi-stage sealing structure and lithium battery

Abstract

The invention relates to a lithium battery top cover with a multi-stage sealing structure and a lithium battery, the lithium battery top cover with the multi-stage sealing structure comprises a polished aluminum sheet, a pole and a sealing ring, the polished aluminum sheet is provided with a through hole, the pole is installed in the through hole, and the sealing ring is clamped between the polished aluminum sheet and the pole; an embedded structure is arranged on the surface, abutting against the sealing ring, of the light aluminum sheet and / or the surface, abutting against the sealing ring, of the pole column, and the embedded structure comprises at least one convex rib and at least one groove; the convex rib is configured to be embedded into the material of the sealing ring under the action of pressure, and meanwhile, the sealing ring deforms and is embedded into the groove, so that multi-stage sealing is formed. The sealing device is reasonable in structure, and the sealing stability and reliability can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more specifically, to a lithium battery top cover with a multi-level sealing structure and a lithium battery. Background Technology

[0002] In the lithium battery manufacturing industry, the sealing performance of the top cover is one of the key factors determining battery safety and lifespan. Currently, common lithium battery top cover sealing structures typically employ a sealing ring between the terminal post and the aluminum sheet. Sealing is achieved through the deformation of the sealing ring caused by the mutual compression of multiple components. However, this traditional compression sealing method relies on the uniform compression of the sealing ring, resulting in a seal at only a single interface. In practical applications, insufficient surface smoothness or uneven compression can easily create leakage paths at this single interface. Furthermore, to ensure reliable sealing, a large amount of compression is often required, which may lead to excessive deformation and extrusion of the sealing ring, causing dimensional inconsistencies in the height of the top cover assembly. Summary of the Invention

[0003] The purpose of this invention is to provide a lithium battery top cover and a lithium battery with a multi-level sealing structure, which can ensure the stability and reliability of the seal.

[0004] A lithium battery top cover with a multi-level sealing structure includes an aluminum sheet, an electrode post, and a sealing ring. The aluminum sheet has a through hole, the electrode post is installed in the through hole, and the sealing ring is sandwiched between the aluminum sheet and the electrode post. The surface of the aluminum sheet that abuts against the sealing ring and / or the surface of the pole that abuts against the sealing ring are provided with an embedded structure, the embedded structure including at least one rib and at least one groove; The ribs are configured to embed into the material of the sealing ring under pressure, while the sealing ring deforms and embeds itself into the groove, thereby forming a multi-stage seal.

[0005] In the above technical solution, by setting the embedded structure of ribs and grooves on the surface of the component in contact with the sealing ring, the ribs can be squeezed into the body of the sealing ring during assembly and pressing, while the grooves provide space for the deformation of the sealing ring. This interlocking structure forms multiple continuous physical isolation barriers on a single pressing surface, thereby forming a multi-level seal, which significantly improves the overall sealing reliability of the top cover and effectively reduces the risk of air leakage.

[0006] Furthermore, the ribs and the grooves are arranged at intervals.

[0007] In the above technical solution, the ribs and grooves are arranged at intervals, so that the sealing ring can undergo continuous wave-shaped deformation when under pressure, making the sealing pressure more evenly distributed in the contact area, avoiding stress concentration, thereby making the deformation of the sealing ring sufficient and stable, and further enhancing the independence of each sealing barrier and the tightness of the overall sealing interface.

[0008] Furthermore, the ribs and grooves are formed into annular shapes that match the shape of the sealing ring.

[0009] In the above technical solution, the ribs and grooves are constructed into annular rings that match the shape of the sealing ring, forming a completely closed and uninterrupted annular sealing band in the circumferential direction. This structure ensures that a consistent and continuous squeezing and embedding action is generated on the entire contact circumference of the sealing ring, thereby achieving a reliable seal in all directions.

[0010] Furthermore, the aluminum sheet has a supporting portion formed on the outer periphery of the through hole, the pole post has an extension portion on its outer periphery, the extension portion is disposed opposite to the supporting portion, and the sealing ring includes a first sealing portion sandwiched between the extension portion and the supporting portion.

[0011] In the above technical solution, by setting the bearing part and the extension part opposite to each other and sandwiching the first sealing part of the sealing ring between them, a stable and aligned axial compression sealing interface is formed, ensuring that the embedded structure can play an effective role.

[0012] Furthermore, the sealing ring also includes a second sealing part, which is sandwiched between the hole wall of the through hole and the outer peripheral surface of the pole post.

[0013] In the above technical solution, the sealing ring is provided with a second sealing part and sandwiched between the through hole wall and the pole post, adding an independent sealing interface in the through hole. Together with the first sealing part, it forms an L-shaped sealing structure, which works in concert to prevent leakage paths from two vertical directions, further enhancing the sealing capability.

[0014] Furthermore, the embedded structure is disposed on the surface of the extension portion that contacts the first sealing portion and / or the surface of the support portion that contacts the first sealing portion.

[0015] In the above technical solution, the embedded structure is specifically set on the contact surface between the extension part and the bearing part, which can directly apply the embedding effect of the rib and the accommodating deformation effect of the groove to the main sealing area, thereby improving the sealing effect.

[0016] Furthermore, the outer periphery of the bearing portion is provided with an upwardly extending enclosure.

[0017] In the above technical solution, the enclosure wall on the outer periphery of the bearing part not only serves to position and contain the internal components, but its inner circumferential surface can also serve as a sealing surface, further improving the sealing effect.

[0018] Furthermore, the outer periphery of the extension is fitted with a rubber-coated component, and the outer peripheral surface of the rubber-coated component abuts against the inner peripheral surface of the enclosure.

[0019] In the above technical solution, by setting a rubber-coated part in the extension part and having its outer peripheral surface abut against the inner peripheral surface of the enclosure, a sealing structure is added between the enclosure and the rubber-coated part, thereby improving the sealing performance.

[0020] Furthermore, the upper end of the enclosure is provided with a bendable fixing part, which presses the rubber-coated part tightly after bending.

[0021] In the above technical solution, the upper end of the enclosure is set as a bendable fixing part, which directly presses the rubber-coated part by bending and deforming, ensuring that the entire sealing assembly will not deform due to vibration or material creep during use, thereby maintaining the durability and stability of the sealing pressure.

[0022] A lithium battery includes the aforementioned lithium battery top cover with a multi-level sealing structure.

[0023] In the above technical solution, the lithium battery with the multi-level sealed top cover structure has good top cover sealing performance, which can effectively prevent electrolyte leakage and external moisture intrusion, thereby ensuring the long-term stability of the internal environment of the cell and improving the overall service life and safety performance of the lithium battery.

[0024] Compared with the prior art, the beneficial effects of the present invention are: by setting the embedded structure of ribs and grooves on the surface of the component in contact with the sealing ring, the ribs can be squeezed into the interior of the sealing ring body during assembly and pressing, while the grooves provide a space to accommodate the deformation of the sealing ring. This interlocking structure forms multiple continuous physical isolation barriers on a single pressing surface, thereby forming a multi-level seal, which significantly improves the overall sealing reliability of the top cover and effectively reduces the risk of air leakage. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the lithium battery top cover with a multi-stage sealing structure according to the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the first embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the embedded structure of the present invention.

[0029] Explanation of icon numbers: 1. Aluminum sheet, 11. Through hole, 12. Supporting part, 2. Pole post, 21. Extension part, 3. Sealing ring, 31. First sealing part, 32. Second sealing part, 4. Embedded structure, 41. Raised rib, 42. Groove, 5. Enclosure, 51. Fixing part, 6. Rubber-coated part. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] Please refer to Figures 1 to 4 The lithium battery top cover with a multi-level sealing structure of the present invention mainly includes an aluminum sheet 1, an electrode post 2, and a sealing ring 3. The aluminum sheet 1 has a through hole 11, the electrode post 2 is installed in the through hole 11, and the sealing ring 3 is sandwiched between the aluminum sheet 1 and the electrode post 2. An embedding structure 4 is provided on the surface of the aluminum sheet 1 abutting against the sealing ring 3 and / or the surface of the electrode post 2 abutting against the sealing ring 3. The embedding structure 4 includes at least one rib 41 and at least one groove 42. The rib 41 is configured to embed into the material of the sealing ring 3 under pressure, while the sealing ring 3 deforms and embeds into the groove 42, thereby forming a multi-level seal.

[0033] It should be noted that the core innovation of this invention lies in establishing a multi-layer sealing structure based on the traditional planar seal through the cooperation of the rib 41 and the groove 42. The rib 41 is embedded in the sealing ring 3 material to form the first seal, while the sealing ring 3 material is embedded in the groove 42 to form the second seal. This multi-layer embedding structure effectively enhances the sealing reliability.

[0034] For example, the aluminum sheet 1 is flat and has a through hole 11. The electrode post 2 is made of conductive metal and is installed at the through hole 11 to achieve electrical connection between the inside and outside of the battery. The sealing ring 3 is made of an existing elastic sealing material, such as fluororubber, and is sandwiched between the aluminum sheet 1 and the electrode post 2. The embedded structure 4 can be provided on one of the aluminum sheet 1 or the electrode post 2, or on both. In this embodiment, the embedded structure 4 includes a rib 41 and two grooves 42, with the two grooves 42 located on both sides of the rib 41. It can be understood that in other possible embodiments, different numbers of grooves 42 and ribs 41 can be provided according to the width of the sealing ring 3.

[0035] As can be seen from the above technical solution, by setting the embedded structure 4 of rib 41 and groove 42 on the surface of the component in contact with the sealing ring 3, the rib 41 can be squeezed into the body of the sealing ring 3 during assembly and pressing, while the groove 42 provides a space to accommodate the deformation of the sealing ring 3. This mutually embedded structure forms multiple continuous physical isolation barriers on a single pressing surface, thereby forming a multi-level seal, which significantly improves the overall sealing reliability of the top cover and effectively reduces the risk of air leakage.

[0036] The ribs 41 and grooves 42 are arranged alternately. By setting the ribs 41 and grooves 42 to be arranged alternately, the sealing ring 3 can undergo continuous wave-shaped deformation when under pressure, so that the sealing pressure is distributed more evenly in the contact area, avoiding stress concentration. This makes the deformation of the sealing ring 3 sufficient and stable, further enhancing the independence of each sealing barrier and the tightness of the overall sealing interface.

[0037] The rib 41 and groove 42 are formed into an annulus that matches the shape of the sealing ring 3. By constructing the rib 41 and groove 42 into an annulus that matches the shape of the sealing ring 3, a completely closed and uninterrupted annular sealing band can be formed in the circumferential direction. This structure ensures that a consistent and continuous compression and embedding action is generated throughout the entire contact circumference of the sealing ring 3, thereby achieving a reliable seal in all directions.

[0038] The aluminum sheet 1 has a supporting portion 12 formed on the outer periphery of the through hole 11, and the pole post 2 has an extension portion 21 on its outer periphery. The extension portion 21 is arranged opposite to the supporting portion 12. The sealing ring 3 includes a first sealing portion 31, which is sandwiched between the extension portion 21 and the supporting portion 12. By arranging the supporting portion 12 and the extension portion 21 opposite to each other and sandwiching the first sealing portion 31 of the sealing ring 3 between them, a stable and aligned axially compressed sealing interface is formed, ensuring that the embedded structure 4 can function effectively.

[0039] The sealing ring 3 also includes a second sealing part 32, which is sandwiched between the wall of the through hole 11 and the outer peripheral surface of the pole post 2. The sealing ring 3, with its second sealing part 32 sandwiched between the wall of the through hole 11 and the pole post 2, adds an independent sealing interface within the through hole 11. Together with the first sealing part 31, it forms an L-shaped sealing structure, collaboratively preventing leakage paths from two perpendicular directions and further enhancing the sealing capability.

[0040] Please refer to Figure 2 and Figure 3 The embedded structure 4 is disposed on the surface of the extension portion 21 that contacts the first sealing portion 31 and / or the surface of the support portion 12 that contacts the first sealing portion 31. By specifically disposing the embedded structure 4 on the contact surface of the extension portion 21 and the support portion 12, the embedding effect of the rib 41 and the accommodating deformation effect of the groove 42 can be directly applied to the main sealing area, thereby improving the sealing effect.

[0041] in, Figure 2 In the first embodiment of the present invention, the embedded structure 4 is disposed on the extension portion 21 of the pole post 2. Figure 3 In a second embodiment of the present invention, the embedded structure 4 is disposed on the support portion 12 of the aluminum sheet 1. It is understood that in other embodiments, there may be two embedded structures 4, respectively disposed on the extension portion 21 and the support portion 12, to further improve the reliability of the seal.

[0042] It should be noted that the existing top cover increases the thickness of the aluminum sheet 1 at certain locations to improve the compression of the sealing ring 3, thereby achieving reliable sealing. This structure makes it difficult to stamp and extrude the aluminum sheet 1. In this embodiment, by setting the embedded structure 4 in the extension part 21 and / or the bearing part 12, the thickness of the aluminum sheet 1 does not need to be changed, thereby reducing the processing difficulty.

[0043] The outer periphery of the support portion 12 is provided with an upwardly extending enclosure 5. The enclosure 5 on the outer periphery of the support portion 12 not only serves to position and contain the internal components, but its inner circumferential surface can also serve as a sealing surface, further improving the sealing effect.

[0044] An overmolded part 6 is fitted around the outer periphery of the extension portion 21, and the outer peripheral surface of the overmolded part 6 abuts against the inner peripheral surface of the enclosure wall 5. For example, the overmolded part 6 can be made of existing insulating rubber material, which has deformable elasticity. By providing the overmolded part 6 in the extension portion 21 and having its outer peripheral surface abut against the inner peripheral surface of the enclosure wall 5, a sealing structure is added between the enclosure wall 5 and the overmolded part 6, thereby improving the sealing performance.

[0045] In addition, the rubber-coated part 6 not only provides an extra sealing function, but also serves as insulation between the pole 2 and the aluminum sheet 1, preventing short circuits. Its elastic properties allow it to adapt to assembly tolerances and maintain stable sealing pressure during long-term use.

[0046] The upper end of the enclosure 5 is provided with a bendable fixing part 51, which presses the rubber-coated part 6 after bending. By setting the upper end of the enclosure 5 as a bendable fixing part 51, the rubber-coated part 6 is directly pressed by its bending deformation, ensuring that the entire sealing assembly will not deform due to vibration or material creep during use, thereby maintaining the durability and stability of the sealing pressure.

[0047] It should be noted that the fixing part 51 is bent through a riveting process. This mechanical fixing method provides a reliable preload, ensuring that each component is always pressed and effectively preventing the sealing performance from deteriorating due to material aging or temperature changes.

[0048] The present invention also provides a lithium battery, including the lithium battery top cover with the above-described multi-stage sealing structure. By adopting the above-described multi-stage sealing top cover structure, the top cover of the lithium battery has good sealing performance, which can effectively prevent electrolyte leakage and external moisture intrusion, thereby ensuring the long-term stability of the internal environment of the cell and improving the overall service life and safety performance of the lithium battery.

[0049] In the description of this invention, it should be understood that terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery top cover with a multi-stage sealing structure, characterized in that, It includes a light aluminum sheet, an electrode post, and a sealing ring. The light aluminum sheet has a through hole, the electrode post is installed in the through hole, and the sealing ring is sandwiched between the light aluminum sheet and the electrode post. The surface of the aluminum sheet that abuts against the sealing ring and / or the surface of the pole that abuts against the sealing ring are provided with an embedded structure, the embedded structure including at least one rib and at least one groove; The ribs are configured to embed into the material of the sealing ring under pressure, while the sealing ring deforms and embeds itself into the groove, thereby forming a multi-stage seal.

2. The lithium battery top cover with a multi-stage sealing structure according to claim 1, characterized in that, The raised ribs and the grooves are arranged at intervals.

3. The lithium battery top cover with a multi-stage sealing structure according to claim 1, characterized in that, The ribs and grooves are formed into an annular shape that matches the shape of the sealing ring.

4. The lithium battery top cover with a multi-stage sealing structure according to claim 1, characterized in that, The aluminum sheet has a supporting portion formed on the outer periphery of the through hole, and the pole has an extension portion on the outer periphery. The extension portion is disposed opposite to the supporting portion. The sealing ring includes a first sealing portion, which is sandwiched between the extension portion and the supporting portion.

5. The lithium battery top cover with a multi-stage sealing structure according to claim 4, characterized in that, The sealing ring further includes a second sealing part, which is sandwiched between the hole wall of the through hole and the outer peripheral surface of the pole post.

6. The lithium battery top cover with a multi-stage sealing structure according to claim 4, characterized in that, The embedded structure is disposed on the surface of the extension portion that contacts the first sealing portion and / or the surface of the support portion that contacts the first sealing portion.

7. The lithium battery top cover with a multi-stage sealing structure according to claim 4, characterized in that, The outer periphery of the bearing portion is provided with an upwardly extending enclosure.

8. The lithium battery top cover with a multi-stage sealing structure according to claim 7, characterized in that, The outer periphery of the extension is fitted with a rubber-coated component, and the outer peripheral surface of the rubber-coated component abuts against the inner peripheral surface of the enclosure.

9. The lithium battery top cover with a multi-stage sealing structure according to claim 8, characterized in that, The upper end of the enclosure is provided with a bendable fixing part, which presses the rubber-coated part tightly after bending.

10. A lithium battery, characterized in that, The lithium battery top cover having a multi-level sealing structure as described in any one of claims 1 to 9.

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