Patch assembly of battery cell top cover, battery cell top cover assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, and discloses a patch assembly of a battery cell top cover, a battery cell top cover assembly and a battery cell. The patch assembly comprises a patch body which is used for being pasted on the surface of one side, far away from a battery core inner core, of a battery core top cover; the patch body is provided with at least one convex hull structure, the convex hull structure is used for wrapping a boss on a battery cell top cover, and the convex hull structure corresponds to the boss on the battery cell top cover in position and is matched with the boss on the battery cell top cover in size. According to the utility model, the convex hull structure corresponding to the boss in position and matched with the boss in size is arranged on the patch body, so that the boss is accurately wrapped, and an external conductive path is thoroughly isolated. Meanwhile, the matching of positions and sizes can ensure that the convex hulls are tightly attached to the bosses, and insulation loopholes caused by gaps and dislocation are eliminated. In addition, the convex hull structure covers the side wall and the top (except the necessary functional opening) of the boss, the contact between the metal exposed area and the external conductive part is blocked, and the short circuit risk is fundamentally eliminated.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a patch assembly for a cell top cover, a cell top cover assembly, and a cell. Background Technology

[0002] In related technologies, the insulating patch design for the top cover of power battery cells generally adopts a planar patch structure. This type of patch only covers the outer surface of the top cover, but cannot handle raised boss structures on the top cover (such as aluminum sheet protrusions). Specifically, the planar patch cannot cover the sidewalls and top of the boss, causing the metal portion of the boss to be directly exposed to the external environment. The top and sidewalls of the boss may come into contact with other metal components of the top cover (such as rivet blocks or metal frames), forming potential conductive paths. Utility Model Content

[0003] In view of this, the present invention provides a patch assembly for a battery cell top cover, a battery cell top cover assembly, and a battery cell, to solve the problem of incomplete insulation performance of insulating patches in related technologies.

[0004] In a first aspect, this utility model provides a patch assembly for a battery cell top cover, comprising:

[0005] The patch body is used to attach to the surface of the top cover of the battery cell that is away from the inner core of the battery cell;

[0006] The patch body is provided with at least one convex hull structure, which is used to wrap the boss on the top cover of the battery cell, wherein the position of the convex hull structure corresponds to the boss on the top cover of the battery cell and their sizes match.

[0007] Beneficial Effects: This utility model provides a patch assembly for a battery cell top cover. By setting a raised bulge structure on the patch body that corresponds to the position and matches the size of the raised bulge, precise wrapping of the raised bulge is achieved, completely isolating external conductive paths. Simultaneously, the matching position and size ensures a tight fit between the bulge and the raised bulge, eliminating insulation gaps caused by misalignment. Furthermore, the bulge structure covers the sidewalls and top of the raised bulge (except for necessary functional openings), blocking contact between the exposed metal area and external conductive components, fundamentally eliminating the risk of short circuits.

[0008] In one optional embodiment, the top of the convex structure is provided with a through mounting hole, the mounting hole being for the passage of the upper plastic of the cell top cover, and the size of the mounting hole is larger than the size of the upper plastic of the cell top cover.

[0009] Beneficial effects: This embodiment, by designing the mounting hole to be larger than the upper plastic, allows for smooth installation of the upper plastic while ensuring insulation protection of the boss's sidewalls, avoiding assembly difficulties caused by insufficient size. Furthermore, it exposes only the non-conductive upper plastic, completely isolating the boss's metal area from external conductive paths. Simultaneously, the gap between the mounting hole and the upper plastic reduces friction between the upper plastic and the boss structure, extending its service life.

[0010] In one optional embodiment, the top of the convex structure is provided with a wrapping surface extending toward the mounting hole. The wrapping surface is used to wrap around the top edge of the boss, and the width of the wrapping surface is greater than 0.5 mm and less than or equal to 30 mm.

[0011] Beneficial effects: This utility model solves the problem of weak insulation at the top edge of the boss by extending the wrapping surface. Specifically, the wrapping surface covers the top edge of the boss, eliminating the short circuit risk caused by edge exposure in traditional designs. The design with a width greater than 0.5mm enhances the mechanical strength of the edge area, reducing the probability of failure due to stress concentration. Furthermore, the dimensions of the wrapping surface and the mounting hole are designed to be independent, ensuring proper exposure of the upper plastic while reinforcing the insulation boundary.

[0012] In one optional embodiment, the number of the convex hull structures is two, and the two convex hull structures are respectively located on both ends of the patch body. The two convex hull structures are respectively used to wrap the two protrusions located at both ends of the top cover of the battery cell.

[0013] Beneficial effects: The symmetrical design of the two-end convex structure ensures that the protrusions at both ends of the cell top cover are fully covered, avoiding insulation imbalance caused by unilateral protection. Simultaneously, since each convex structure only covers its corresponding protrusion, structural complexity is reduced, and assembly accuracy is improved. Furthermore, the layout of the two-end convex structures can also distribute the stress on the patch body, reducing the risk of stress concentration in the central area.

[0014] In one optional embodiment, the patch body is further provided with an explosion-proof valve hole, which is located between the two convex structures. The explosion-proof valve hole is used to avoid the explosion-proof valve, and the position of the explosion-proof valve hole corresponds to that of the explosion-proof valve on the top cover of the battery cell and their sizes are matched.

[0015] Beneficial effect: The explosion-proof valve hole can provide an installation or working channel for the explosion-proof valve on the top cover of the battery cell, avoiding the blockage of the explosion-proof valve's normal function by the patch body.

[0016] In one optional embodiment, the thickness of the patch body is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0017] Beneficial effects: This embodiment achieves a balance between lightweight, mechanical strength, and functional compatibility by limiting the thickness of the patch body to 0.1mm-1mm. This design directly optimizes the overall performance of the patch assembly, meeting the high requirements of power battery cells for compactness, safety, and reliability.

[0018] In one alternative implementation, the patch assembly further includes release paper;

[0019] The patch assembly has a used state and an idle state; in the used state, the patch body is attached to the surface of the top cover of the battery cell away from the battery cell; in the idle state, the patch body is attached to the release paper.

[0020] Beneficial effects: The patch assembly of this utility model, through the protective design of the release paper, can prevent contamination or tack decay of the adhesive surface, ensuring that the bonding strength meets the requirements after long-term storage, thereby ensuring reliable adhesion of the patch body during use. At the same time, the above-mentioned patch assembly supports manual or automated quick installation, thus simplifying the operation process and reducing the rework rate caused by contamination of the adhesive surface.

[0021] In one optional embodiment, the thickness of the release paper is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0022] And / or, in the idle state, the edge distance between the patch body and the release paper is less than 1.5 mm, and the release paper is provided with a tear handle extending away from the patch body.

[0023] Beneficial effects: This embodiment strikes a balance between protective function, space constraints, and cost by limiting the thickness range of the release liner, ensuring that the release liner protects the patch assembly without interfering with its final adhesion and performance. Furthermore, during manual installation, the user can easily peel off the release liner by simply grasping the tear handle and pulling, without needing to touch the patch itself.

[0024] Secondly, this utility model also provides a battery cell top cover assembly, comprising:

[0025] The patch assembly for the top cover of the battery cell as described in the first aspect of the present invention;

[0026] The top cover of the battery cell has a patch body attached to the surface of the top cover away from the inner core of the battery cell, and the protrusion structure on the patch body wraps around the protrusion on the top cover of the battery cell.

[0027] Thirdly, this utility model also provides a battery cell, comprising:

[0028] The cell top cover assembly as described in the second aspect embodiment of this utility model;

[0029] The battery cell inner core and the battery cell housing are provided, wherein the battery cell inner core is installed inside the battery cell housing, and the battery cell top cover assembly is placed on the battery cell housing. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is one of the structural schematic diagrams of the patch assembly of the battery cell top cover according to an embodiment of the present utility model;

[0032] Figure 2 This is a second schematic diagram of the structure of the patch assembly of the battery cell top cover according to an embodiment of the present utility model;

[0033] Figure 3 This is one of the structural schematic diagrams of the patch assembly of the battery cell top cover in an idle state according to an embodiment of this utility model;

[0034] Figure 4 This is the second schematic diagram of the patch assembly of the battery cell top cover in an idle state according to an embodiment of the present utility model;

[0035] Figure 5 This is one of the structural schematic diagrams of the battery cell top cover assembly according to an embodiment of the present utility model;

[0036] Figure 6 For along Figure 5 Sectional view of line AA in the middle;

[0037] Figure 7 This is the second structural schematic diagram of the battery cell top cover assembly according to an embodiment of the present utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Patch body; 11. Explosion-proof valve hole; 12. QR code hole;

[0040] 2. Convex bulge structure; 21. Mounting hole; 22. Wrapping surface; 3. Release paper; 31. Tear handle;

[0041] 4. Battery cell top cover; 41. Boss; 5. Top plastic. Detailed Implementation

[0042] 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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 limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0045] In this embodiment of the utility model, unless otherwise explicitly 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.

[0046] The following description, with reference to the accompanying drawings, illustrates a patch assembly for a battery cell top cover 4, a battery cell top cover assembly, and a battery cell according to this invention. The patch assembly is used on the battery cell top cover assembly and the battery cell to wrap and protect the battery cell top cover 4.

[0047] like Figures 1 to 7As shown, the patch assembly of the battery cell top cover 4 according to the first aspect embodiment of the present utility model includes a patch body 1, which is used to be attached to the side surface of the battery cell top cover 4 away from the battery cell core. The patch body 1 is provided with at least one convex structure 2, which is used to wrap the boss 41 on the battery cell top cover 4. The convex structure 2 corresponds to the boss 41 on the battery cell top cover 4 in position and their sizes are matched.

[0048] The specific structure of the patch assembly of the battery cell top cover 4 according to an embodiment of the present utility model is described below:

[0049] The patch body 1 is an insulating substrate covering the outer surface of the cell top cover 4 (the side away from the inner core of the cell), and its shape is adapted to the contour of the cell top cover 4. The patch body 1 can serve as a basic support layer, providing overall insulation protection for the cell top cover 4, and providing a mounting carrier for the convex structure 2.

[0050] The patch body 1 has at least one raised bulge structure 2, the shape of which matches the shape of the protrusion 41 on the cell top cover 4. The raised bulge structure 2 is directly formed or fixed to the patch body 1, forming an integral structure with the patch body 1. Each raised bulge structure 2 corresponds one-to-one with the protrusion 41 on the cell top cover 4 in spatial position, ensuring that the raised bulge structure 2 can accurately wrap the protrusion 41. At the same time, the dimensions (such as height and width) of the raised bulge structure 2 are completely matched with the dimensions of the protrusion 41 to achieve a tight wrap. In this way, the raised bulge structure 2 tightly wraps the protrusion 41 of the cell top cover 4 through the matching of position and size, forming a local insulation barrier.

[0051] Specifically, the working principle of the patch assembly of this utility model is as follows: The convex hull structure 2 tightly wraps around the protrusion 41, forming a physical barrier to prevent external conductive components (such as metal foreign objects or tools) from directly contacting the protrusion 41, thereby avoiding the risk of short circuits. Simultaneously, the matching of position and size ensures a complete fit between the convex hull structure 2 and the protrusion 41, eliminating insulation gaps. Furthermore, the dimensions of the convex hull structure 2 perfectly match the protrusion 41, ensuring precise protection can be achieved without additional adjustments during assembly.

[0052] Based on the above working principle, the working process of the patch assembly of this utility model is as follows:

[0053] The patch body 1 is attached to the outer surface of the cell top cover 4, and the convex structure 2 automatically aligns with and wraps around the boss 41. The convex structure 2 fits tightly against the boss 41 through size matching, forming an insulating layer. When an external conductive component comes into contact with the patch body 1, the wrapping design of the convex structure 2 prevents current from being conducted through the boss 41, avoiding short circuits. The precise matching between the convex structure 2 and the boss 41 ensures the stability and reliability of the protection.

[0054] In related technologies, the insulating patch design for the top cover of power battery cells generally adopts a planar patch structure. This type of patch only covers the outer surface of the top cover, but cannot handle raised boss structures on the top cover (such as aluminum sheet protrusions). Specifically, the planar patch cannot cover the sidewalls and top of the boss, causing the metal portion of the boss to be directly exposed to the external environment. The top and sidewalls of the boss may come into contact with other metal components of the top cover (such as rivet blocks or metal frames), forming potential conductive paths.

[0055] Therefore, to address the technical deficiencies in the aforementioned related technologies, this utility model provides a patch assembly for the top cover 4 of a battery cell. By setting a convex structure 2 on the patch body 1 that corresponds to and matches the size of the protrusion 41, precise wrapping of the protrusion 41 is achieved, completely isolating external conductive paths. Simultaneously, the matching of position and size ensures a tight fit between the convex structure and the protrusion 41, eliminating insulation gaps and misalignments. Furthermore, the convex structure 2 covers the sidewalls and top of the protrusion 41 (except for necessary functional openings), blocking contact between the exposed metal area and external conductive components, fundamentally eliminating the risk of short circuits.

[0056] like Figure 1 As shown, according to some embodiments of the present invention, the top of the convex structure 2 is provided with a through mounting hole 21, the mounting hole 21 is used for the upper plastic 5 of the battery cell top cover 4 to pass through, and the size of the mounting hole 21 is larger than the size of the upper plastic 5 of the battery cell top cover 4.

[0057] In this embodiment, a mounting hole 21 is provided at the top of the convex structure 2, extending from the top to the bottom of the convex structure 2. The size (e.g., diameter or side length) of the mounting hole 21 is larger than the size of the plastic 5 on the top cover 4 of the battery cell. For example, if the diameter of the plastic 5 (e.g., an insulating cap or seal) on the top of the protrusion 41 is 4.0 mm, then the diameter of the mounting hole 21 is designed to be 4.2 mm to 4.5 mm. Simultaneously, the shape of the mounting hole 21 matches the shape of the plastic 5, such as a circular, square, or irregular shape. Furthermore, the mounting hole 21 is integrally formed with the convex structure 2 to ensure structural integrity and sealing.

[0058] It is understood that the upper plastic 5 is typically installed on the top of the boss 41 of the cell top cover 4 to achieve insulation, sealing, or electrical connection functions (such as riveting fixation, electrode connection). The upper plastic 5 is exposed on the top of the patch assembly through the mounting hole 21 and cooperates with external structures (such as electrode connection pieces, riveting blocks).

[0059] The specific functions of the mounting hole 21 are as follows: The mounting hole 21, designed to be larger than the upper plastic 5, ensures that the upper plastic 5 can pass smoothly through it, avoiding installation difficulties or deformation of the upper plastic 5 due to insufficient size. The mounting hole 21 only allows the upper plastic 5 to be exposed, while the metal portion of the boss 41 is enclosed by the protrusion structure 2, blocking external conductive paths. Furthermore, the reserved dimensional gap (e.g., 0.1mm to 0.3mm) prevents friction between the upper plastic 5 and the edge of the protrusion structure 2, reducing the risk of wear. Thus, the mounting hole 21 and the protrusion sidewall together form a "top opening + sidewall enclosure" structure, ensuring the functionality of the upper plastic 5 while achieving lateral insulation of the boss 41.

[0060] Specifically, the working process based on the aforementioned mounting hole 21 is as follows: The upper plastic 5 (such as an insulating cap) is installed on the top of the boss 41 of the cell top cover 4, exposed through the mounting hole 21 on the top of the boss. The size clearance of the mounting hole 21 ensures that the upper plastic 5 passes smoothly without additional adjustment. When an external conductive component (such as a riveting block) contacts the upper plastic 5, the insulating material on the side wall of the boss prevents current from being conducted through the side wall of the boss 41; the size design of the mounting hole 21 ensures that the upper plastic 5 works normally (such as sealing and electrical connection), while avoiding damage to the upper plastic 5 due to interference fit.

[0061] In summary, this embodiment, by designing the mounting hole 21 to be larger than the upper plastic 5, ensures both insulation protection of the boss 41's sidewalls and allows for smooth installation of the upper plastic 5, avoiding assembly difficulties caused by excessively small dimensions. Furthermore, by exposing only the non-conductive upper plastic 5, it completely isolates the metal area of ​​the boss 41 from external conductive paths. Simultaneously, the pre-reserved gap between the mounting hole 21 and the upper plastic 5 reduces friction between the upper plastic 5 and the raised structure 2, extending its service life.

[0062] like Figure 1 As shown, according to some embodiments of the present invention, the top of the convex structure 2 is provided with a wrapping surface 22 extending toward the mounting hole 21. The wrapping surface 22 is used to wrap around the top edge of the boss 41, and the width of the wrapping surface 22 is greater than 0.5 mm and less than or equal to 30 mm.

[0063] In this embodiment, the wrapping surface 22 extends from the top edge of the convex structure 2 toward the center of the mounting hole 21, covering the edge area of ​​the top of the boss 41. Simultaneously, the extension width of the wrapping surface 22 (the distance from the edge of the convex structure 2 to the end of the wrapping surface 22) is greater than 0.5 mm, for example, 0.6 mm to 2 mm. The wrapping surface 22 can be designed as a bevel, arc, or right angle structure to ensure a tight fit with the top edge of the boss 41.

[0064] It is understandable that the edge area of ​​the top of the boss 41 (such as the exposed connection between the boss 41 and the upper plastic 5) may have exposed metal or sharp edges due to process reasons, requiring further insulation and protection through the wrapping surface 22. In this embodiment, the wrapping surface 22 can closely fit the edge area of ​​the top of the boss 41, forming a partial covering layer to prevent this area from being directly exposed. For example, if there is a 0.3mm wide exposed metal at the top edge of the boss 41, the wrapping surface 22 is designed to be 0.8mm wide to completely cover the exposed area.

[0065] It should be noted that the maximum width of the aforementioned wrapping surface 22 can be 30mm. Therefore, the width of the wrapping surface 22 can be within the range of 0.5mm to 30mm. For example, the width of the wrapping surface 22 can be 0.7mm, 1.0mm, 1.5mm, 4mm, 8mm, 12mm, 15mm, 20mm, 25mm, 28mm, or 30mm. The specific width of the wrapping surface 22 needs to be selected according to the specific application scenario. When the battery cell size is small, the wrapping surface 22 can use a smaller width; while when the battery cell size is large, the wrapping surface 22 can use a larger width to ensure that the top edge area of ​​the protrusion 41 is covered.

[0066] In this way, the present invention solves the problem of weak insulation at the top edge of the boss 41 by extending and covering the top edge of the boss 41. Specifically, the covering surface 22 covers the top edge of the boss 41, eliminating the risk of short circuits caused by edge exposure in traditional designs. The design with a width greater than 0.5mm enhances the mechanical strength of the edge area and reduces the probability of failure due to stress concentration. In addition, the dimensions of the covering surface 22 and the mounting hole 21 do not interfere with each other, ensuring that the upper plastic 5 is properly exposed while strengthening the insulation boundary.

[0067] like Figure 6 As shown, according to some embodiments of this utility model, the height of the top inner wall of the convex structure 2 on the patch body 1 is the same as the height of the boss 41 on the top cover 4 of the battery cell. In this way, the height of the top inner wall of the convex structure is the same as that of the boss 41, which can eliminate gaps, prevent external electrolyte, metal debris or moisture from entering, and improve insulation and sealing performance.

[0068] like Figures 5 to 7 As shown, according to some embodiments of the present invention, there are two convex structures 2, which are located at both ends of the patch body 1, and are used to wrap the two protrusions 41 located at both ends of the top cover 4 of the battery cell.

[0069] In this embodiment, the patch body 1 is typically elongated or rectangular, adapting to the contour of the battery cell top cover 4. Two protrusion structures 2 are provided at both ends (e.g., the beginning and end ends) of the patch body 1. Each protrusion structure 2 corresponds one-to-one with the protrusions 41 (e.g., aluminum sheet protrusions) at both ends of the battery cell top cover 4, forming a symmetrical or asymmetrical layout.

[0070] Each convex structure 2 has a mounting hole 21 (larger than the upper plastic 5) and a wrapping surface 22 on its top. The size of each convex structure perfectly matches the corresponding boss 41, ensuring precise wrapping. The mounting hole 21 on the top of each convex structure allows the upper plastic 5 of the corresponding boss 41 to be exposed, while ensuring insulation at both ends.

[0071] In this way, the symmetrical design of the two-end protrusion structure 2 ensures that the protrusions 41 at both ends of the cell top cover 4 are fully covered, avoiding insulation imbalance caused by unilateral protection. At the same time, since each protrusion is only responsible for covering its corresponding protrusion 41, structural complexity is reduced and assembly accuracy is improved. Furthermore, the layout of the two-end protrusions can also distribute the stress on the patch body 1, reducing the risk of stress concentration in the central area.

[0072] like Figure 1 As shown, the patch body 1 is further provided with an explosion-proof valve hole 11. The explosion-proof valve hole 11 is located between two convex structures 2. The explosion-proof valve hole 11 is used to avoid the explosion-proof valve. The explosion-proof valve hole 11 corresponds to the position of the explosion-proof valve on the top cover 4 of the battery cell and their sizes match.

[0073] It is understood that the explosion-proof valve hole 11 is located in the central area of ​​the patch body 1, between the two convex structures 2 (located at both ends of the patch). The shape of the explosion-proof valve hole 11 is basically consistent with the shape of the explosion-proof valve on the top cover 4 of the battery cell (such as circular, elliptical, or irregular shape). At the same time, the size of the explosion-proof valve hole 11 is slightly larger than the size of the explosion-proof valve, for example, its diameter or side length exceeds that of the explosion-proof valve by 0.1mm to 0.5mm, ensuring that the explosion-proof valve can pass through smoothly without interference.

[0074] In this way, the explosion-proof valve hole 11 can provide an installation or working channel for the explosion-proof valve of the cell top cover 4, avoiding the patch body 1 from blocking the normal function of the explosion-proof valve.

[0075] like Figure 1 As shown, a QR code hole 12 is further provided on the outer side of the explosion-proof valve hole 11. The QR code hole 12 is used to display the QR code of the battery cell recorded on the top cover 4 of the battery cell.

[0076] The shape of the QR code hole 12 matches the shape of the QR code on the top cover 4 of the battery cell (usually square or circular). Meanwhile, the size of the QR code hole 12 is slightly larger than the QR code area on the top cover 4 of the battery cell, for example, exceeding it by 0.2mm to 1mm in both length and width, to ensure the QR code is fully exposed. It is understood that the battery cell QR code typically contains information such as the battery cell batch, specifications, and production date, used for traceability and management.

[0077] In this way, the QR code hole 12 provides a visible window for the QR code on the top cover 4 of the battery cell, making it easy to scan and identify.

[0078] According to some embodiments of the present invention, the thickness of the patch body 1 is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0079] In this embodiment, the thickness of the patch body 1 is between 0.1 mm and 1 mm, for example, 0.2 mm, 0.5 mm, 0.8 mm, or 1.0 mm. Common materials for the patch body 1 include polycarbonate (PC), which can meet the requirements for insulation, flexibility, and mechanical strength.

[0080] It's understandable that a thickness range of 0.1mm to 1mm significantly reduces the weight of surface mount components while maintaining mechanical strength (e.g., a 0.5mm thickness is 70% lighter than a traditional 1.6mm PCB). For example, 0.2mm thick PC material can withstand 10N / m. 2 The bending force meets the requirements of cell vibration testing. Furthermore, a thickness ≥0.1mm can meet the minimum breakdown voltage requirements of the insulation material (e.g., ≥15kV / mm breakdown voltage for 0.2mm PC material). A thickness ≤1mm can avoid gaps between the patch body 1 and the cell top cover 4 due to excessive thickness, which would affect the sealing performance.

[0081] Thus, by limiting the thickness of the patch body 1 to 0.1mm-1mm, this embodiment achieves a balance between lightweight, mechanical strength, and functional compatibility. This design directly optimizes the overall performance of the patch assembly, meeting the high requirements of power battery cells for compactness, safety, and reliability.

[0082] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the patch assembly of the battery cell top cover 4 further includes release paper 3. The patch assembly has a used state and an idle state; in the used state, the patch body 1 is attached to the surface of the battery cell top cover 4 away from the battery cell; in the idle state, the patch body 1 is attached to the release paper 3.

[0083] It should be explained that the release paper 3 is a peelable protective layer used to protect the adhesive surface of the patch body 1 when the patch assembly is not in use (idle state). It is commonly made of silicone-coated paper or PET film, with a low-adhesion surface that is easy to peel off without leaving any residue. Furthermore, the release paper 3 must meet high-temperature resistance (e.g., 120℃) and moisture-proof requirements to ensure that its adhesiveness does not decrease after long-term storage.

[0084] Understandably, in the idle state, the release paper 3 is in direct contact with the adhesive surface of the patch body 1, and is fixed by weak adhesion, forming a protective state that can be stored or transported. When in use, the release paper 3 is completely peeled off, exposing the adhesive surface of the patch body 1 to achieve adhesion to the top cover 4 of the battery cell. In the use state, the patch body 1 forms a permanent bond to the surface of the top cover 4 of the battery cell through an adhesive material (such as pressure-sensitive adhesive).

[0085] The core functions of the release paper 3 are as follows: (1) Protecting the adhesive surface: Preventing the adhesive surface of the patch body 1 from contacting dust, moisture or impurities before storage, transportation or installation, ensuring adhesive performance. (2) Preventing mis-application: Preventing the patch body 1 from accidentally adhering to the surface of other objects when not in use. (3) Regional protection: If the release paper 3 is designed in regions, it can protect the edge of the convex structure 2 or the explosion-proof valve hole 11 separately, which is convenient for accurate installation. (4) Optimized installation process: Users only need to peel off the release paper 3 to directly attach the patch body 1 to the top cover 4 of the battery cell, simplifying the operation steps. (5) Compatible with automated assembly: The release paper 3 is designed to be compatible with automated mounting equipment (such as pick and place machines), improving production line efficiency.

[0086] Specifically, the working process of the patch assembly is as follows: In the idle state, release paper 3 covers the adhesive surface of the patch body 1, forming a complete protective layer, suitable for storage, transportation, or temporary storage on the production line. During the installation and use stage, the user peels off the release paper 3 from one end, gradually exposing the adhesive surface of the patch body 1; aligns the patch body 1 with the cell top cover 4, and applies uniform pressure to ensure that the adhesive surface is completely adhered to the top cover surface; after the adhesive material cures (usually requiring 5-10 minutes or accelerated by heating), the patch assembly enters the use state. In the use state, the patch body 1 continuously provides insulation protection (through the convex structure 2), and provides passage for the explosion-proof valve hole 11 and the QR code hole 12 on the cell top cover 4, while the release paper 3 has been completely removed.

[0087] Thus, the patch assembly of this invention, through the protective design of the release paper 3, can prevent contamination or tack reduction of the adhesive surface, ensuring that the bonding strength meets requirements after long-term storage, thereby ensuring reliable adhesion of the patch body 1 during use. At the same time, the patch assembly supports manual or automated quick installation, thereby simplifying the operation process and reducing rework rates caused by adhesive surface contamination.

[0088] Furthermore, the thickness of the release paper 3 is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0089] It is understandable that 0.1mm is the minimum thickness of the release liner 3 that can effectively protect the adhesive surface of the patch body 1. A thinner release liner 3 (such as 0.05mm) may not be able to withstand slight compression or dust contamination during transportation, leading to adhesive layer failure. 1mm is the maximum thickness of the release liner 3 while ensuring flexibility and adhesion. A thicker release liner 3 (such as 1.2mm) may cause its edges to curl, making it difficult to accurately peel off the patch body 1, and increasing the overall thickness, which may exceed the space limitations of the battery cell design.

[0090] Thus, by limiting the thickness range of the release paper 3, this embodiment strikes a balance between protective function, space constraints, and cost, ensuring that the release paper 3 can protect the patch assembly without interfering with its final bonding and performance.

[0091] like Figure 3 and Figure 4 As shown, further, in the idle state, the edge distance between the patch body 1 and the release paper 3 is less than 1.5 mm, and the release paper 3 is provided with a tear handle 31 extending away from the patch body 1.

[0092] It should be explained that the edge gap between the patch body 1 and the release paper 3 is controlled within 1.5mm to ensure complete adhesion between the two, preventing the patch body 1 from shifting or its edges from being exposed during storage (such as contamination due to exposed adhesive surface). At the same time, the compact design reduces storage and transportation space requirements, making it particularly suitable for high-density packaging in battery cell production lines. Furthermore, the small margin design reduces the amount of dust or impurities entering the gap between the patch body 1 and the release paper 3, protecting the adhesive surface. For example, the margin design is 0.5mm-1.2mm (e.g., 0.8mm).

[0093] In this embodiment, the release paper 3 is also provided with a tear handle 31. The tear handle 31 is a protrusion or strip-shaped structure (such as a triangle or trapezoid) extending outward from the edge of the release paper 3, making it convenient for the user to grasp and tear the release paper 3 with their fingers. The tear handle 31 extends away from the patch body 1 to avoid pulling on the patch body 1 during tearing, preventing displacement or damage. The dimensions of the tear handle 31 are typically: width ≥ 5mm, length ≥ 10mm, ensuring easy gripping and resistance to breakage. Thus, during manual installation, the user only needs to grasp the tear handle 31 and pull to easily peel off the release paper 3 without contacting the patch body 1.

[0094] like Figures 5 to 7As shown, the battery cell top cover assembly according to the second aspect embodiment of the present invention includes a patch assembly of the battery cell top cover 4 as in the first aspect embodiment of the present invention, and also includes the battery cell top cover 4. The patch body 1 is attached to the side surface of the battery cell top cover 4 away from the battery cell core, and the protrusion structure 2 on the patch body 1 covers the protrusion 41 on the battery cell top cover 4.

[0095] It is understood that the boss 41 of the top cover assembly of the battery cell is used to support and pass through the electrode post, on which the upper plastic 5 component is installed. The upper plastic 5 tightly wraps the outer periphery of the electrode post to achieve insulation isolation between the electrode and the external environment. The boss 41 and the upper plastic 5 together constitute the fixing and sealing structure of the electrode post, and the convex structure 2 of the patch assembly further wraps the outer side of the boss 41, forming double protection. This ensures a stable connection between the electrode and the top cover, and prevents electrolyte leakage or contact with external conductive materials through the insulating layer of the patch body 1 and the sealing design of the convex structure. At the same time, it maintains the normal operation of functional areas such as the explosion-proof valve, QR code and sealing nail hole.

[0096] like Figures 5 to 7 As shown, the battery cell according to the third aspect embodiment of the present invention includes the battery cell top cover assembly as in the second aspect embodiment of the present invention, and also includes a battery cell inner core and a battery cell housing. The battery cell inner core is installed inside the battery cell housing, and the battery cell top cover assembly is disposed on the battery cell housing.

[0097] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A patch assembly for a battery cell top cover, characterized in that, include: The patch body is used to attach to the surface of the top cover of the battery cell that is away from the inner core of the battery cell; The patch body is provided with at least one convex hull structure, which is used to wrap the boss on the top cover of the battery cell, wherein the position of the convex hull structure corresponds to the boss on the top cover of the battery cell and their sizes match.

2. The patch assembly for the cell top cover according to claim 1, characterized in that, The top of the convex structure is provided with a through mounting hole, and the upper plastic of the cell top cover is used to pass through the mounting hole, and the size of the mounting hole is larger than the size of the upper plastic of the cell top cover.

3. The patch assembly for the cell top cover according to claim 2, characterized in that, The top of the convex structure is provided with a wrapping surface extending toward the mounting hole. The wrapping surface is used to wrap around the top edge of the boss, and the width of the wrapping surface is greater than 0.5 mm and less than or equal to 30 mm.

4. The patch assembly for the cell top cover according to claim 2, characterized in that, The number of the convex hull structures is two, and the two convex hull structures are respectively located on both ends of the patch body. The two convex hull structures are used to wrap the two protrusions located at both ends of the top cover of the battery cell.

5. The patch assembly for the cell top cover according to claim 4, characterized in that, The patch body is also provided with an explosion-proof valve hole, which is located between the two convex structures. The explosion-proof valve hole is used to avoid the explosion-proof valve. The position of the explosion-proof valve hole corresponds to that of the explosion-proof valve on the top cover of the battery cell and their sizes are matched.

6. The patch assembly for the cell top cover according to claim 2, characterized in that, The thickness of the patch body is greater than or equal to 0.1 mm and less than or equal to 1 mm.

7. The patch assembly for the cell top cover according to any one of claims 1 to 6, characterized in that, It also includes release paper; The patch assembly has a used state and an idle state; in the used state, the patch body is attached to the surface of the top cover of the battery cell away from the battery cell; in the idle state, the patch body is attached to the release paper.

8. The patch assembly for the cell top cover according to claim 7, characterized in that, The thickness of the release paper is greater than or equal to 0.1 mm and less than or equal to 1 mm. And / or, in the idle state, the edge distance between the patch body and the release paper is less than 1.5 mm, and the release paper is provided with a tear handle extending away from the patch body.

9. A battery cell top cover assembly, characterized in that, include: The patch assembly of the cell top cover as described in any one of claims 1 to 8; The top cover of the battery cell has a patch body attached to the surface of the top cover away from the inner core of the battery cell, and the protrusion structure on the patch body wraps around the protrusion on the top cover of the battery cell.

10. A battery cell, characterized in that, include: The cell top cover assembly as described in claim 9; The battery cell inner core and the battery cell housing are provided, wherein the battery cell inner core is installed inside the battery cell housing, and the battery cell top cover assembly is placed on the battery cell housing.

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