Sealing element, top cover assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a sealing element, a top cover assembly and a battery. The sealing element comprises a sealing element body and a partition part, the sealing element body comprises a first surface, the first surface faces the outer side of the battery, an annular groove is formed in the first surface in the circumferential direction, and the circle center of the annular groove coincides with the center of the first surface; the multiple partition parts are arranged at intervals with the center of the first surface as the circle center, the extending direction of the partition parts is parallel to the radial direction of the first surface, at least part of the partition parts are arranged in the annular groove and connected to the two opposite side walls of the annular groove, and the positions of the partition parts are configured to correspond to the positions of pre-welding points of the sealing element one to one. And a connecting line of a connecting point between the partition part and the battery as well as the sealing element body is overlapped with a welding line of the pre-welding point. According to the sealing element, the positioning precision of the pre-welding point can be improved through the partition part, and the sealing element is reinforced, so that the tilting of the sealing element during pre-welding is effectively weakened or avoided, and the welding quality is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a sealing element, a top cover assembly, and a battery. Background Technology

[0002] During the manufacturing process of power batteries, after the electrolyte injection process is completed, the injection hole on the top cover needs to be sealed to prevent the electrolyte from overflowing.

[0003] Current technology uses sealing components to achieve sealing. After the sealing components are assembled, laser welding is performed to ensure a good seal and prevent leakage, foreign liquids, or gases from entering the battery, thus avoiding affecting battery quality. Pre-welding is performed before full laser welding; however, during pre-welding of the sealing components, issues such as misalignment of the screws and misalignment of the sealing components frequently occur, causing the periphery of the sealing components to lift. This leads to weld leaks and insufficient penetration after welding, resulting in poor sealing performance and a significantly compromised weld appearance. Welding quality is difficult to guarantee, and it can even lead to welding failure and battery failure.

[0004] Therefore, there is an urgent need for a seal, a top cover assembly, and a battery to solve the above problems. Utility Model Content

[0005] One objective of this invention is to provide a sealing element that can improve the positioning accuracy at the pre-welding point through the partition portion and reinforce the sealing element, thereby effectively reducing or preventing the sealing element from lifting during pre-welding and ensuring welding quality.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A sealing element, used to seal the electrolyte filling port on the battery, includes:

[0008] The sealing body includes a first surface facing the outside of the battery, and an annular groove is provided on the first surface in a circumferential direction, the center of the annular groove coinciding with the center of the first surface.

[0009] The partition is provided in multiple parts, which are spaced apart with the center of the first surface as the center. The extension direction of the partition is parallel to the radial direction of the first surface. At least some of the partitions are disposed in the annular groove and connected to the opposite side walls of the annular groove. The positions of the multiple partitions are configured to correspond one-to-one with the positions of the pre-weld points of the seal. Along the radial direction of the first surface, the line connecting the partition to the connection point between the battery and the seal body coincides with the weld line of the pre-weld point.

[0010] Optionally, a portion of the partition is disposed within the annular groove, and another portion of the partition extends radially along the first surface and is flush with the edge of the sealing body.

[0011] Optionally, a portion of the partition is disposed within the annular groove, and another portion of the partition extends radially along the first surface and protrudes beyond the edge of the sealing body to form a protruding limiting portion, the protruding limiting portion being in contact with the outer surface of the battery.

[0012] Optionally, a through hole is provided on the protruding limiting part, and a limiting post is provided on the outer surface of the battery at a position corresponding to the through hole, and the limiting post can be inserted into the through hole.

[0013] Optionally, the top surface of the partition is flush with the top surface of the sealing body; or, the top surface of the partition protrudes from the top surface of the sealing body.

[0014] Optionally, the sealing body further includes a second surface, which is disposed opposite to and spaced apart from the first surface. The second surface is closer to the electrode assembly of the battery than the first surface. The diameter of the second surface is smaller than the diameter of the first surface. The second surface can abut against the stepped surface protruding from the inner wall of the injection hole.

[0015] Optionally, one of the second surface and the stepped surface has a positioning hole, and the other has a positioning protrusion that mates with the positioning hole. When the second surface abuts against the stepped surface, the positioning protrusion can be inserted into the positioning hole.

[0016] Another objective of this utility model is to provide a top cover assembly, including a top cover plate and the aforementioned sealing element, wherein a liquid injection hole is provided through the top cover plate, and the sealing element is in a sealing fit with the liquid injection hole.

[0017] Optionally, the top cover assembly further includes a rubber stud, and the injection hole includes a first hole segment and a second hole segment arranged sequentially along the insertion direction of the seal into the injection hole, the seal blocking the first hole segment and the rubber stud blocking the second hole segment.

[0018] Another objective of this utility model is to provide a battery, including a housing, an electrode assembly, and the aforementioned top cover assembly, wherein the housing is hollow and has an opening, the electrode assembly is disposed inside the housing, and the top cover assembly is fastened to the opening of the housing.

[0019] The beneficial effects of this utility model are:

[0020] The sealing element provided by this utility model has its body housed within an injection hole to achieve a preliminary seal. Multiple partitions are spaced apart around the center of a first surface, with each partition corresponding to a pre-weld point on the sealing element for more precise positioning. The partitions extend radially parallel to the first surface, with at least a portion located within an annular groove and connected to opposite side walls of the groove. The line connecting the partitions to the connection points between the battery and the sealing element body along the radial direction of the first surface coincides with the weld line of the pre-weld point. In other words, the partitions are at least located within the annular groove, or extend from the groove towards the edge of the sealing element body. The weld line of the pre-weld point extends from the partitions to the edge of the connection between the sealing element body and the battery, increasing the weld line length. The partitions also provide reinforcement on the surface of the sealing element body, thereby enhancing the structural strength at the pre-weld point and effectively reducing or preventing the sealing element from lifting during pre-welding, ensuring welding quality.

[0021] The top cover assembly provided by this utility model achieves the sealing of the injection hole through the above-mentioned sealing element. The weld structure between the sealing element and the top cover plate has high strength and good sealing effect.

[0022] The battery provided by this utility model uses the above-mentioned top cover assembly to fasten to the opening of the shell, which effectively protects the electrode assembly and electrolyte inside the shell from the outside and ensures the safety of the battery during use. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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 the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of the top cover assembly in an exploded state according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the sealing element provided in Embodiment 1 of this utility model;

[0026] Figure 3 This is a top view of the sealing element provided in Embodiment 1 of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the sealing element provided in Embodiment 2 of this utility model;

[0028] Figure 5 This is a top view of the sealing element provided in Embodiment 2 of this utility model;

[0029] Figure 6 This is a schematic diagram of the sealing element provided in Embodiment 3 of this utility model;

[0030] Figure 7 This is a top view of the sealing element provided in Embodiment 3 of this utility model.

[0031] In the picture:

[0032] 10. Top cover plate; 20. Injection hole; 201. First hole section; 202. Second hole section; 203. Stepped surface; 2031. Positioning protrusion; 30. Adhesive nail;

[0033] 1. Sealing body; 11. First surface; 111. Annular groove; 12. Second surface; 121. Locating hole;

[0034] 2. Partition; 21. Protruding limiting part. Detailed Implementation

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present 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 present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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 limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this utility model, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this utility model, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0043] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0044] Example 1

[0045] Figure 1 A cross-sectional view showing the top cover assembly in an exploded state according to an embodiment of the present invention is shown; Figure 2 This diagram shows the structure of the sealing element provided in Embodiment 1 of the present invention; Figure 3 A top view of the sealing element provided in Embodiment 1 of this utility model is shown, as follows: Figures 1-3 As shown, this embodiment provides a seal, a top cover assembly, and a battery.

[0046] like Figure 1 As shown, the sealing element provided in this embodiment is used to seal the injection hole 20 on the top cover assembly. Specifically, the top cover assembly includes a top cover plate 10 and the aforementioned sealing element. The injection hole 20 is formed through the top cover plate 10, and the sealing element is sealed to the injection hole 20 to prevent electrolyte leakage.

[0047] More specifically, the top cover assembly also includes a rubber stud 30. The injection hole 20 includes a first hole segment 201 and a second hole segment 202 sequentially arranged along the insertion direction of the sealing member into the injection hole 20. In this embodiment, the diameter of the first hole segment 201 is larger than the diameter of the second hole segment 202, and the rubber stud 30 is interference-fitted with the second hole segment 202 to achieve a seal for the second hole segment 202. The sealing member is welded and fixed to the hole wall of the injection hole 20 to complete the seal of the first hole segment 201. The sealing member blocks the first hole segment 201, and the rubber stud 30 blocks the second hole segment 202. The sealing member and the rubber stud 30 work together to further improve the sealing effect.

[0048] The battery provided in this embodiment includes a casing (not shown), an electrode assembly (not shown), and the aforementioned top cover assembly. The casing is hollow and has an opening. The electrode assembly is disposed inside the casing, and the top cover assembly is snap-fitted to the opening of the casing. The top cover assembly can isolate the electrode assembly and electrolyte inside the casing from the outside, ensuring the safety of the battery during use.

[0049] Reference Figure 2 and Figure 3 The sealing element provided in this embodiment includes a sealing element body 1 and partition portions 2. The sealing element body 1 includes a first surface 11 facing the outer side of the battery. An annular groove 111 is provided on the first surface 11 along the circumferential direction, and the center of the annular groove 111 coincides with the center of the first surface 11. Multiple partition portions 2 are provided, and the multiple partition portions 2 are spaced apart with the center of the first surface 11 as the center. The extending direction of the partition portions 2 is parallel to the radial direction of the first surface 11. At least a portion of the partition portions 2 is disposed within the annular groove 111 and connected to the opposite side walls of the annular groove 111. The positions of the multiple partition portions 2 are configured to correspond one-to-one with the positions of the pre-welding points of the sealing element. Along the radial direction of the first surface 11, the line connecting the partition portion 2 to the connection point between the battery and the sealing element body 1 coincides with the weld line of the pre-welding point.

[0050] In this embodiment, the sealing body 1 is housed within the first hole segment 201 of the injection hole 20 to achieve a preliminary seal on the first hole segment 201. The partition portion 2 is at least disposed within the annular groove 111, or extends from the annular groove 111 to the edge of the sealing body 1. The weld line of the pre-weld point extends from the partition portion 2 to the edge of the connection between the sealing body 1 and the top cover plate 10, thereby increasing the weld line length and achieving a pre-welded connection between the sealing body 1 and the top cover plate 10. The partition portion 2 also serves as a reinforcement on the surface of the sealing body 1, thereby increasing the structural strength at the pre-weld point and effectively reducing or preventing the sealing element from lifting during pre-welding, ensuring welding quality.

[0051] For example, the number of partitions 2 can be selected as 4, 6 or 8, etc., and there is no limitation here. The partitions 2 are evenly distributed with the center of the first surface 11 as the center. Multiple partitions 2 serve as pre-welding points, which can effectively improve the structural strength of the seal and ensure the reliability of the connection between the seal and the top cover plate 10 during pre-welding.

[0052] Optionally, the top surface of the partition portion 2 is flush with the top surface of the sealing body 1; or, the top surface of the partition portion 2 protrudes beyond the top surface of the sealing body 1. This configuration can provide reinforcement to the surface of the sealing element, thereby effectively reducing or preventing the sealing element from warping during pre-welding, and thus ensuring the subsequent welding quality.

[0053] Continue to refer to Figure 2 and Figure 3 The sealing body 1 also includes a second surface 12. The second surface 12 is disposed opposite to and spaced apart from the first surface 11. The second surface 12 is closer to the battery electrode assembly than the first surface 11, and its diameter is smaller than that of the first surface 11. The second surface 12 can abut against the protruding stepped surface 203 of the inner wall of the injection hole 20. In other words, the sealing body 1 has an inverted frustum structure, and its diameter gradually decreases along the direction in which it is inserted into the injection hole 20. This arrangement forms a guide slope between the second surface 12 and the first surface 11 to facilitate the insertion of the sealing body 1.

[0054] Specifically, one of the second surface 12 and the stepped surface 203 has a positioning hole 121, and the other has a positioning protrusion 2031 that mates with the positioning hole 121. When the second surface 12 abuts against the stepped surface 203, the positioning protrusion 2031 can be inserted into the positioning hole 121 to achieve positioning and fixing between the sealing body 1 and the top cover plate 10.

[0055] More specifically, multiple positioning holes 121 are provided, and the multiple positioning holes 121 are evenly arranged along the circumference of the second surface 12. Multiple positioning protrusions 2031 are provided accordingly, so as to enhance the reliability of positioning and the stability of connection between the sealing body 1 and the top cover plate 10.

[0056] Optionally, in this embodiment, the depth of the annular groove 111 is 0.1mm-5mm; or, the depth of the annular groove 111 is 1 / 8-2 / 3 of the thickness of the sealing body 1.

[0057] Example 2

[0058] Figure 4 This diagram shows the structure of the sealing element provided in Embodiment 2 of the present invention; Figure 5 This is a top view of the sealing element provided in Embodiment 2 of the present invention, with reference to... Figure 4 and Figure 5 This embodiment provides a sealing element that is basically the same as the sealing element provided in Embodiment 1. The difference between this embodiment and Embodiment 1 lies in the specific structure of the partition part 2.

[0059] In this embodiment, a portion of the partition 2 is disposed within the annular groove 111, and another portion of the partition 2 extends radially along the first surface 11 and is flush with the edge of the sealing body 1.

[0060] In other words, during pre-welding, the welding can start directly from the partition 2 and continue along the partition 2 to the connection between the sealing body 1 and the top cover plate 10. The partition 2 serves directly as the welding line, avoiding the offset of the welding head during welding and effectively ensuring the welding quality.

[0061] Example 3

[0062] Figure 6 This diagram shows the structure of the sealing element provided in Embodiment 3 of the present invention; Figure 7 This is a top view of the sealing element provided in Embodiment 3 of the present invention, with reference to... Figure 6 and Figure 7 This embodiment provides a sealing element that is basically the same as the sealing element provided in Embodiment 1. The difference between this embodiment and Embodiment 1 lies in the specific structure of the partition part 2.

[0063] In this embodiment, a portion of the partition 2 is disposed within the annular groove 111, and another portion of the partition 2 extends radially along the first surface 11 and protrudes from the edge of the sealing body 1 to form a protruding limiting portion 21, which is in contact with the outer surface of the battery.

[0064] This configuration allows the partition 2 to be used directly as the welding line during pre-welding, effectively preventing the welding head from shifting during welding and ensuring welding quality. Simultaneously, the partition 2 protrudes from the edge of the sealing body 1, extending the welding line to the top cover plate 10, further enhancing the connection strength between the sealing body 1 and the top cover plate 10.

[0065] Optionally, a through hole is provided on the protruding limiting part 21, and a limiting post is provided on the top cover plate 10 at a position corresponding to the through hole. The limiting post can be inserted into the through hole to limit the sealing body 1 during assembly and to prevent the sealing body 1 from rotating during welding.

[0066] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sealing element, characterized in that, For sealing the electrolyte filling hole (20) on the battery, including: The sealing body (1) includes a first surface (11) facing the outside of the battery. An annular groove (111) is provided on the first surface (11) along the circumferential direction, and the center of the annular groove (111) coincides with the center of the first surface (11). The partition (2) is provided in multiple ways. The multiple partitions (2) are arranged at intervals with the center of the first surface (11) as the center. The extension direction of the partitions (2) is parallel to the radial direction of the first surface (11). At least a portion of the partitions (2) are disposed in the annular groove (111) and connected to the opposite side walls of the annular groove (111). The positions of the multiple partitions (2) are configured to correspond one-to-one with the positions of the pre-welding points of the seal. Along the radial direction of the first surface (11), the line connecting the partition (2) to the connection point between the battery and the seal body (1) coincides with the welding line of the pre-welding point.

2. The seal according to claim 1, characterized in that, Part of the partition (2) is disposed in the annular groove (111), and another part of the partition (2) extends radially along the first surface (11) and is flush with the edge of the sealing body (1).

3. The seal according to claim 1, characterized in that, Part of the partition (2) is disposed in the annular groove (111), and another part of the partition (2) extends radially along the first surface (11) and protrudes from the edge of the sealing body (1) to form a protruding limiting part (21), which is in contact with the outer surface of the battery.

4. The seal according to claim 3, characterized in that, A through hole is provided on the protruding limiting part (21), and a limiting post is provided on the outer surface of the battery at a position corresponding to the through hole, and the limiting post can be inserted into the through hole.

5. The seal according to claim 1, characterized in that, The top surface of the partition (2) is flush with the top surface of the sealing body (1); or, the top surface of the partition (2) protrudes from the top surface of the sealing body (1).

6. The seal according to claim 1, characterized in that, The sealing body (1) further includes a second surface (12), which is disposed opposite to and spaced apart from the first surface (11). The second surface (12) is closer to the electrode assembly of the battery than the first surface (11). The diameter of the second surface (12) is smaller than the diameter of the first surface (11). The second surface (12) can abut against the stepped surface (203) protruding from the inner wall of the injection hole (20).

7. The seal according to claim 6, characterized in that, One of the second surface (12) and the stepped surface (203) has a positioning hole (121), and the other has a positioning protrusion (2031) that cooperates with the positioning hole (121). When the second surface (12) abuts against the stepped surface (203), the positioning protrusion (2031) can be inserted into the positioning hole (121).

8. A top cover assembly, characterized in that, It includes a top cover plate (10) and a seal as described in any one of claims 1-7, wherein the top cover plate (10) has a through-hole (20) for injection, and the seal is sealed to the injection hole (20).

9. The top cover assembly according to claim 8, characterized in that, The top cover assembly also includes a rubber nail (30), and the injection hole (20) includes a first hole section (201) and a second hole section (202) arranged sequentially along the insertion direction of the seal into the injection hole (20). The seal blocks the first hole section (201), and the rubber nail (30) blocks the second hole section (202).

10. A battery, characterized in that, It includes a housing, an electrode assembly, and a top cover assembly as described in claim 8 or 9, wherein the housing is hollow and has an opening, the electrode assembly is disposed within the housing, and the top cover assembly is snap-fitted to the opening of the housing.

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