Top cover assembly and battery

Abstract

This application discloses a top cover assembly and a battery, relating to the field of battery technology. The top cover assembly includes an end cover plate, an electrical connector, and a seal. The end cover plate has a first surface and a second surface spaced apart along its thickness direction. The electrical connector is disposed on the second surface. The end cover plate has an injection hole extending along its thickness direction. The end cover plate also has a groove coaxially disposed with the injection hole, located on the first surface and communicating with the injection hole. The end cover also includes a boss coaxially disposed with the injection hole, protruding from the second surface. The injection hole passes through the boss. The seal is disposed within the injection hole and seals it. The top cover assembly provided in this application, by providing a groove and a boss at both ends of the injection hole, causes the entire injection hole structure to sink, forming a "reinforcing rib" effect, thereby enhancing the structural strength and deformation resistance of the injection hole area and reducing the deformation of the injection hole caused by end cover deformation.

Description

Technical Field

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

[0002] In the structure of a lithium-ion battery, the cell is the core component. The chemical reaction inside the cell produces gas, causing the internal pressure of the cell to rise. To prevent the end cap from deforming during gas generation or pressurization, a liquid injection hole is usually provided on the end cap, and the battery's airtightness is ensured by sealing with steel balls.

[0003] When the internal pressure of the battery cell increases, the end cap may deform due to the stress, which in turn causes a change in the shape of the injection hole. This change in the diameter of the injection hole affects the fit accuracy between the steel ball and the injection hole, thus reducing the effectiveness and reliability of the seal. Utility Model Content

[0004] In view of this, this application provides a top cover assembly and a battery, with the aim of solving one of the technical problems in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, this application provides a top cover assembly, including an end cover plate, an electrical connector, and a seal. The end cover plate has a first surface and a second surface spaced apart along its thickness direction. The electrical connector is disposed on the second surface. The end cover plate has an injection hole that extends through the thickness direction of the end cover plate. The end cover plate also has a groove coaxially disposed with the injection hole. The groove is disposed on the first surface and communicates with the injection hole. The end cover also includes a boss coaxially disposed with the injection hole. The boss protrudes from the second surface. The injection hole extends through the boss. The seal is disposed inside the injection hole and seals the injection hole.

[0006] In an optional embodiment, in the thickness direction of the end cover plate, the thickness of the end cover plate is D1, the recess depth of the groove is D2, and the height of the boss protruding from the second surface is D3, satisfying: D2≤D3<D1.

[0007] In an optional embodiment, the edge of the orthographic projection of the groove coincides with the edge of the boss portion in the thickness direction of the end cap.

[0008] In optional embodiments, the cross-section of the groove is one of the following: circular, elliptical, rectangular, or slotted; and / or The cross-section of the boss portion is one of the following: circular, elliptical, rectangular, or slotted.

[0009] In an optional embodiment, the top cover assembly further includes a sealing element disposed within the groove and not protruding from the first surface.

[0010] In an optional embodiment, at least a portion of the plugging member is located within the injection hole, and the plugging member covers the end of the injection hole near the first surface.

[0011] In an optional embodiment, the end of the injection hole near the first surface is chamfered; and / or The end of the groove near the first surface has a chamfer.

[0012] In an optional embodiment, the top cover assembly further includes two spaced-apart poles protruding from the first surface, and two electrical connectors, one of which is electrically connected to one pole, with the injection hole disposed between the two poles.

[0013] In an optional embodiment, the seal is spherical and is interference-fitted with the injection hole.

[0014] Secondly, this application provides a battery including the top cover assembly described in any of the foregoing embodiments.

[0015] Compared to existing technologies, the beneficial effects of this application are as follows: This application proposes a top cover assembly, including an end cover plate, an electrical connection piece, and a seal. The end cover plate has a first surface and a second surface spaced apart along its thickness direction. The electrical connection piece is disposed on the second surface. The end cover plate has an injection hole extending along its thickness direction. The end cover plate also has a groove coaxially disposed with the injection hole, located on the first surface and communicating with the injection hole. The end cover also includes a boss coaxially disposed with the injection hole, protruding from the second surface. The injection hole passes through the boss. The seal is disposed within the injection hole and seals it. By providing a groove (recessed structure) and a boss (protruding structure) at both ends of the injection hole, this application causes the entire injection hole structure to sink, forming a "reinforcing rib" effect. This enhances the structural strength and deformation resistance of the injection hole area, reduces the deformation of the injection hole caused by end cover deformation, improves the effectiveness and reliability of the steel ball seal, and enhances the overall safety and service life of the battery. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The present application shows schematic diagrams of the battery structure in some embodiments; Figure 2 An exploded structural diagram of a battery in some embodiments of this application is shown; Figure 3 A schematic diagram of the cross-sectional structure of the battery in some embodiments of this application is shown; Figure 4 It shows Figure 3 A magnified structural diagram of point I in the middle.

[0018] Key component symbols: 100-Battery; 110-Top cover assembly; 120-Cell; 130-Housing; 111-End cover plate; 112-Electrical connector; 113-Seal; 1111-First surface; 1112-Second surface; 1113-Injection hole; 1114-Groove; 1115-Boss; 114-Sealing component; 11131-Injection hole chamfer; 11141-Groove chamfer; 115-Terminal post. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of the 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 application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0021] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] In related technologies, during charging, discharging, high temperature, aging, etc., the battery cell may generate gas or increase internal pressure, causing deformation of the end cap, which in turn affects the structural stability of the injection hole area, thereby causing the failure of the seal (such as steel ball), resulting in electrolyte leakage or gas escape, affecting the safety and service life of the battery.

[0025] In response to the above problems, such as Figure 1 and Figure 2 As shown, an embodiment of this application provides a top cover assembly 110, which is mainly used to reduce the deformation of the injection hole 1113 and improve the sealing performance of the steel ball.

[0026] See also Figure 3 and Figure 4The top cover assembly 110 includes an end cover plate 111, an electrical connector 112, and a seal 113. The end cover plate 111 has a first surface 1111 and a second surface 1112 spaced apart along its thickness direction. The electrical connector 112 is disposed on the second surface 1112. The end cover plate 111 has an injection hole 1113 that extends through the thickness direction of the end cover plate 111. The end cover plate 111 also has a groove 1114 coaxially disposed with the injection hole 1113. The groove 1114 is disposed on the first surface 1111 and communicates with the injection hole 1113. The end cover also includes a boss portion 1115 coaxially disposed with the injection hole 1113. The boss portion 1115 protrudes from the second surface 1112. The injection hole 1113 passes through the boss portion 1115. The seal 113 is disposed inside the injection hole 1113 and seals the injection hole 1113. This application provides grooves 1114 (recessed structure) and bosses 1115 (protruding structure) at both ends of the injection hole 1113, causing the entire injection hole 1113 structure to sink as a whole, forming a "reinforcing rib" effect. When the end cover plate 111 arches towards the first surface 1111 or towards the second surface 1112, the grooves 1114 and bosses 1115 can suppress the deformation of the injection hole 1113 area located in the center, thereby enhancing the structural strength and deformation resistance of the injection hole 1113 area, reducing the deformation of the injection hole 1113 caused by the deformation of the end cover, improving the effectiveness and reliability of the steel ball seal, and improving the overall safety and service life of the battery 100.

[0027] like Figure 2 The groove 1114 is annular. In one embodiment, the longitudinal section of the groove 1114 is trapezoidal, and the cross-sectional area of ​​the groove 1114 gradually decreases in the direction from the first surface 1111 to the second surface 1112.

[0028] In one embodiment, in the direction of the first surface 1111 near the second surface 1112, the groove 1114 includes a plurality of segments of different diameters, and the connection of the plurality of segments is in a stepped structure to enhance the deformation resistance of the injection hole 1113 region.

[0029] In one embodiment, the boss portion 1115 is annular. In another embodiment, the longitudinal section of the boss portion 1115 is trapezoidal, and the cross-sectional area of ​​the groove 1114 gradually decreases in the direction from the first surface 1111 to the second surface 1112.

[0030] In one embodiment, in the direction of the first surface 1111 near the second surface 1112, the boss portion 1115 includes multiple segments of different diameters, and the connection of the multiple segments is in a stepped structure to enhance the deformation resistance of the injection hole 1113 area.

[0031] In some embodiments, in the thickness direction of the end cover plate 111, the thickness of the end cover plate 111 is D1, the recess depth of the groove 1114 is D2, and the height of the boss portion 1115 protruding from the second surface 1112 is D3, satisfying: D2 ≤ D3 < D1. Figure 4 As shown, part of the injection hole 1113 is located in the end cover plate 111 and part is located in the boss portion 1115. By setting the depth of the groove 1114 to be no greater than the height of the boss, the thickness of the injection hole 1113 area is not too thin, which would reduce the internal force of deformation resistance. It also provides a longer space in the thickness direction of the end cover plate 111, reducing the possibility of the seal 113 separating from the wall of the injection hole 1113.

[0032] In some embodiments, the edge of the orthographic projection of the groove 1114 coincides with the edge of the boss portion 1115 in the thickness direction of the end cover plate 111. For example, the groove 1114 and the boss portion 1115 are symmetrically arranged at both ends of the injection hole 1113, so that the injection hole 1113 area is subjected to uniform force and the structural stability is improved.

[0033] In some embodiments, the cross-section of the groove 1114 is one of a circle, an ellipse, a rectangle, or a slot.

[0034] In some embodiments, the cross-section of the boss portion 1115 is one of a circle, an ellipse, a rectangle, or a slot.

[0035] In some embodiments, the boss portion 1115 and the end cover plate 111 are integrally formed, which improves manufacturing efficiency and reduces assembly complexity.

[0036] In some embodiments, such as Figure 4 As shown, the top cover assembly 110 also includes a sealing element 114.

[0037] The sealing element 114 is disposed within the groove 1114 and does not protrude from the first surface 1111. By fully accommodating the sealing element 114 within the groove 1114, the sealing element 114 is reduced from falling off due to impact, thus protecting the sealing element 114 and improving its service life.

[0038] In some embodiments, at least a portion of the sealing member 114 is located within the injection hole 1113, and the sealing member 114 covers the end of the injection hole 1113 near the first surface 1111. By providing the sealing member 114 at the port of the injection hole 1113, with the sealing member 114 partially extending into the injection hole 1113, the range of motion of the sealing member 113 within the injection hole 1113 is reduced, and the possibility of the sealing member 113 detaching from the injection hole 1113 is reduced. Furthermore, by simultaneously providing the sealing member 114 and the sealing member 113 to seal the injection hole 1113, the reliability and stability of the seal are improved.

[0039] In one embodiment, the sealing element 114 is formed by curing UV adhesive. After the UV adhesive is dripped into the injection hole 1113, it is cured by irradiation with ultraviolet light. After the UV adhesive enters the injection hole 1113, some of it remains in the groove 1114. After the UV adhesive cures, the injection hole 1113 is filled, and the cured UV adhesive is tightly connected to the groove 1114, making it difficult for the sealant to detach from the injection hole 1113.

[0040] In some embodiments, such as Figure 4 As shown, the end of the injection hole 1113 near the first surface 1111 has a chamfer, which is inclined towards the material dropping direction of the seal 113, forming a guide surface. This guide surface guides the seal 113 during its descent, automatically aligning it and entering the straight hole. This improves the positioning accuracy of the seal 113 during material dropping; avoids the steel ball from getting stuck or shifting, and enhances assembly efficiency and sealing reliability.

[0041] In some embodiments, such as Figure 4 As shown, the end of the groove 1114 near the first surface 1111 is chamfered, and a chamfer is formed around the perimeter of the groove 1114, with the chamfer angle inclined towards the injection hole 1113 at the center of the groove 1114, forming a guide surface. During the injection process, when the electrolyte overflows or splashes onto the settling platform, the chamfer structure can guide the electrolyte to flow towards the injection hole 1113, facilitating cleaning, reducing manual intervention, improving production efficiency, and reducing the risk of contamination caused by electrolyte residue.

[0042] In some embodiments, such as Figure 1 As shown, the top cover assembly 110 also includes two spaced-apart poles 115, each protruding from the first surface 1111. Two electrical connecting pieces 112 are provided, with each piece corresponding to one pole 115. An injection port 1113 is located between the two poles 115. Increasing the number of injection ports 1113 improves injection efficiency; it also utilizes the larger space between the two poles 115 to facilitate electrolyte injection, reducing the impact of electrolyte overflow or splashing on the poles 115 and connecting pieces 112, optimizing the overall layout of the top cover assembly 110, and improving production efficiency and product quality.

[0043] In some embodiments, such as Figure 4 As shown, the seal 113 is spherical and is interference-fitted with the injection hole 1113. In one embodiment, the seal 113 is made of steel ball, the diameter of which is slightly larger than the diameter of the straight hole of the injection hole 1113, to seal by interference fit, simplifying the manufacturing process and reducing production costs.

[0044] like Figure 1 and Figure 2As shown, this application also provides a battery 100, including a top cover assembly 110, a housing 130, and a battery cell 120 housed within the housing 130, as described in any of the above embodiments. The top cover assembly 110 covers the top of the housing 130, and the conductive connecting piece 112 is electrically connected to the battery cell 120. The battery 100 has all the beneficial effects of the top cover assembly 110 in any of the above embodiments, which will not be described in detail here.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A cap assembly, characterized by, The device includes an end cap, an electrical connector, and a seal. The end cap has a first surface and a second surface spaced apart along its thickness direction. The electrical connector is disposed on the second surface. The end cap has an injection hole that extends through the thickness direction of the end cap. The end cap also has a groove coaxially disposed with the injection hole. The groove is disposed on the first surface and communicates with the injection hole. The end cap also includes a boss coaxially disposed with the injection hole. The boss protrudes from the second surface and the injection hole passes through the boss. The seal is disposed inside the injection hole and seals the injection hole.

2. The roof assembly of claim 1, wherein, In the thickness direction of the end cover plate, the thickness of the end cover plate is D1, the recess depth of the groove is D2, and the height of the boss protruding from the second surface is D3, satisfying: D2≤D3<D1.

3. The roof assembly of claim 1, wherein, In the thickness direction of the end cover plate, the edge of the orthographic projection of the groove coincides with the edge of the boss portion.

4. The roof assembly of claim 1, wherein, The cross-section of the groove is one of the following: circular, elliptical, rectangular, or slotted; and / or The cross-section of the boss portion is one of the following: circular, elliptical, rectangular, or slotted.

5. The roof assembly of claim 1, wherein, The top cover assembly also includes a sealing element disposed within the groove and not protruding from the first surface.

6. The roof assembly of claim 5, wherein, At least a portion of the plugging member is located within the injection hole, and the plugging member covers the end of the injection hole near the first surface.

7. The roof assembly of any one of claims 1 to 6, wherein, The end of the injection hole near the first surface is chamfered; and / or The end of the groove near the first surface has a chamfer.

8. The top cover assembly according to any one of claims 1 to 6, characterized in that, The top cover assembly also includes two spaced-apart poles that protrude from the first surface. There are two electrical connectors, one of which is electrically connected to one pole. The injection hole is located between the two poles.

9. The top cover assembly according to any one of claims 1 to 6, characterized in that, The seal is spherical and is interference-fitted with the injection hole.

10. A battery, characterized in that, Includes the top cover assembly as described in any one of claims 1 to 9.

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