cell

Abstract

The utility model relates to battery technical field provides a kind of battery, comprising: shell, is formed with accommodating cavity;Battery pole group, is arranged in accommodating cavity;Battery cover plate, is sealed at the opening of accommodating cavity;Insulating film, is covered in the outer surface of shell, is formed with the flanging portion extending to battery cover plate;Cover plate patch, the side surface of cover plate patch is equipped with not completely covering the adhesive layer of this side surface, and cover plate patch is pasted on flanging portion and battery cover plate by adhesive layer.The battery provided by the utility model, by arranging the adhesive layer of cover plate patch as not completely covering its to be pasted side surface, i.e. retaining part of no glue area, the cover plate patch is pressed to insulating film flanging portion and battery cover plate, so that adhesive layer has expandable buffer space when being extruded. The directional flow of colloid to uncoated area significantly reduces the risk of extrusion from the edge of cover plate patch, thereby fundamentally inhibiting the occurrence of overflow phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell. Background Technology

[0002] In existing battery cell packaging processes, the insulating film not only covers the main body of the casing, but its edges often extend upwards and partially cover or adhere to the upper surface or side edge area of ​​the battery cell cover. To meet specific functional or protective requirements (such as temperature sensing, impact protection, and label bearing), an additional independent cover patch (or cover protection sheet, temperature sensing substrate, etc.) is often attached to the battery cell cover. This cover patch is traditionally fixed to the cover surface by an adhesive layer (such as pressure-sensitive adhesive, hot melt adhesive, etc.) on its back.

[0003] However, this existing structure and bonding process has a significant drawback: the adhesive layer used on the back of the cover plate patch usually covers the entire surface to be bonded, or has a large coverage area. During the pressing and bonding process of the cover plate patch to the cover plate, the applied pressure can easily cause the adhesive in the adhesive layer to be squeezed out from the edges of the cover plate patch, forming the so-called "adhesive overflow" phenomenon. Adhesive overflow not only seriously affects the cleanliness of the cell's appearance and reduces product yield, but more importantly, the overflowing adhesive may contaminate critical areas on the cover plate (such as explosion-proof valves, electrode post areas, safety venting channels, etc.), interfering with the normal function of the cell, and may even cause serious safety hazards such as insulation failure or micro-short circuits due to the migration of conductive particles with the adhesive. Utility Model Content

[0004] This utility model provides a battery cell to solve the problem that in the existing battery cell packaging process, the pressure applied to the cover plate can easily cause the adhesive in the adhesive layer to be squeezed out from the edge of the cover plate, resulting in adhesive overflow, which seriously affects the cleanliness of the battery cell appearance and reduces the product yield.

[0005] This utility model provides a battery cell, comprising: The shell has a receiving cavity; The cell electrode assembly is disposed within the receiving cavity; A cell cover plate is installed at the opening of the receiving cavity; An insulating film is wrapped around the outer surface of the housing and has a flanged portion extending to the cell cover plate; A cover plate patch, wherein one side of the cover plate patch is provided with an adhesive layer that does not completely cover the side, and the cover plate patch is adhered to the flange and the cell cover plate through the adhesive layer.

[0006] According to the present invention, an insulating film has an open receiving space on one side for covering the housing, and at least one side of the open side is bent to form a flange portion arranged on the battery cell cover plate.

[0007] According to the present invention, the flanged portion includes: a first flange and a second flange; Both opposite ends of the opening are bent to form first flanges arranged opposite to each other along the length direction of the cell cover plate, and both other opposite ends of the opening are bent to form second flanges arranged opposite to each other along the width direction of the cell cover plate. The cover plate patch is attached to the first flange, the second flange, and the battery cell cover plate via the adhesive layer.

[0008] According to the present invention, the first flange and the second flange are bent to a length greater than or equal to 2 mm on the cell cover plate.

[0009] According to the present invention, the length of the first flange bonded to the adhesive layer is greater than or equal to 0.5 mm, and / or the length of the second flange bonded to the adhesive layer is greater than or equal to 0.5 mm.

[0010] According to the present invention, the adhesive layer is disposed at the center of the cover plate patch near the housing.

[0011] According to the present invention, the distance between the outer contour boundary of the adhesive layer and the corresponding edge of the cover plate patch is 0.2 mm to 1 mm. The distance is the minimum straight-line distance from the projection boundary of the adhesive layer on the plane corresponding to the cover plate patch to the edge of the cover plate patch.

[0012] According to the present invention, the adhesive layer thickness in the central region of the adhesive layer is greater than the adhesive layer thickness in the edge region.

[0013] According to the present invention, the thickness of the cover plate patch is 0.1 mm to 0.5 mm, and the thickness of the adhesive layer is 0.05 mm to 0.3 mm.

[0014] According to the present invention, the cover plate patch is one of PC plastic patch, PET plastic patch or PE plastic patch, and the insulating film is blue film.

[0015] The battery cell provided by this utility model arranges the adhesive layer of the cover plate patch to not completely cover the surface to be bonded, that is, to leave a part of the unbonded area, and presses the cover plate patch onto the flange of the insulating film and the battery cover plate, so that the adhesive layer has an expandable buffer space when it is squeezed. The directional flow of the adhesive to the unbonded area significantly reduces the risk of extrusion from the edge of the cover plate patch, thereby fundamentally suppressing the occurrence of adhesive overflow. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the 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.

[0017] Figure 1 This is a schematic diagram of the battery cell provided by this utility model.

[0018] Figure 2 This is a disassembly diagram of the battery cell provided by this utility model.

[0019] Figure 3 This is a front view of the battery cell provided by this utility model.

[0020] Figure 4 yes Figure 3 A schematic diagram of section AA.

[0021] Figure 5 yes Figure 4 An enlarged view of position B in the middle.

[0022] Figure label: 100, Housing; 200, Cell cover plate; 300, Cover plate patch; 310, Adhesive layer; 400, Insulating film; 410, Flanged edge; 420, Receiving space; 500, Cell electrode assembly. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. 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.

[0027] This utility model embodiment provides a battery cell, such as Figures 1 to 5 As shown, the battery cell includes: a housing 100, a battery cell electrode assembly 500, a battery cell cover plate 200, an insulating film 400, and a cover plate patch 300. The housing 100 forms a receiving cavity; the battery cell electrode assembly 500 is disposed within the receiving cavity; the battery cell cover plate 200 is sealed at the opening of the receiving cavity; the insulating film 400 covers the outer surface of the housing 100 and forms a flanged portion 410 extending to the battery cell cover plate 200; one side of the cover plate patch 300 is provided with an adhesive layer 310 that does not completely cover this side, and the cover plate patch 300 is adhered to the flanged portion 410 and the battery cell cover plate 200 through the adhesive layer 310.

[0028] Specifically, the housing 100 has a receiving cavity for accommodating the cell electrode assembly 500, which is fixed inside the receiving cavity to ensure the normal operation of the cell. The cell cover plate 200 is installed at the opening to seal and protect the internal cell electrode assembly 500, preventing external impurities from entering and internal substances from leaking out.

[0029] The insulating film 400 tightly and uniformly covers the outer surface of the housing 100, forming a flanged portion 410 extending to the cell cover 200. One side of the cover patch 300 has an adhesive layer 310 that does not completely cover that side. This unique adhesive layer 310 design ensures that the cover patch 300 has sufficient adhesion during bonding while retaining some unbonded areas. When compressed, the adhesive in the adhesive layer 310 flows towards the unbonded areas, filling these buffer spaces. This effectively prevents excessive adhesive from being squeezed out from the edges of the cover patch 300 during bonding, thus fundamentally suppressing adhesive overflow. The unbonded areas act like an "adhesive reservoir," providing a reasonable destination for the expansion and flow of the adhesive during bonding, making the bonding process more stable and controllable.

[0030] The battery cell provided by this utility model arranges the adhesive layer 310 of the cover plate patch 300 to not completely cover its surface to be bonded, that is, to retain a part of the unbonded area, and presses the cover plate patch 300 to the flange portion 410 of the insulating film 400 and the battery cover plate, so that the adhesive layer 310 has an expandable buffer space when it is squeezed. The directional flow of the adhesive to the unbonded area significantly reduces the risk of extrusion from the edge of the cover plate patch 300, thereby fundamentally suppressing the occurrence of adhesive overflow.

[0031] In some embodiments, such as Figures 1 to 5 As shown, the insulating film 400 has an open-sided receiving space 420, which is mainly used to cover the housing 100, allowing the insulating film 400 to fit tightly against the outer surface of the housing 100, providing all-round insulation protection for the battery cell. This covering method of the insulating film 400 not only enhances the overall structural stability of the battery cell, but also effectively prevents the potential impact of external environmental factors on the internal structure of the battery cell, such as the intrusion of impurities like moisture and dust, thereby extending the service life of the battery cell.

[0032] At least one side of the open portion is bent to form a flange 410 arranged on the cell cover 200, extending the edge of the insulating film 400 into the area of ​​the cell cover 200. The formation of the flange 410 not only provides additional bonding area for the cover patch 300, but also provides more stable support for the bonding process of the cover patch 300 through its structural characteristics. During the bonding process, the cover patch 300 can be more firmly bonded to the cell cover 200 and the flange 410 of the insulating film 400, thereby effectively avoiding glue overflow caused by poor bonding.

[0033] When the battery cell is a square battery cell, the flange portion 410 includes: a first flange and a second flange; the two opposite ends of the opening are bent to form the first flange, which is arranged opposite to each other along the length direction of the battery cell cover plate 200. The first flange can fit tightly against both sides of the battery cell cover plate 200 along the length direction, providing additional insulation protection for the short side of the battery cell cover plate 200. The other two opposite ends of the opening are bent to form the second flange, which is arranged opposite to each other along the width direction of the battery cell cover plate 200. The second flange is responsible for protecting both sides of the battery cell cover plate 200 along the width direction, ensuring that the long side of the battery cell cover plate 200 also receives good insulation protection.

[0034] The cover patch 300 is adhered to the first flange, the second flange, and the cell cover 200 via an adhesive layer 310. The first and second flanges together form a complete flange portion 410 structure, which not only enhances the insulation performance of the cell cover 200 area but also provides a wider adhesion area for the cover patch 300. This allows the cover patch 300 to adhere more firmly to the cell cover 200 and the flange portion 410 of the insulating film 400, effectively preventing adhesive overflow due to poor adhesion. Even if adhesive overflow occurs during adhesion, the presence of the first and second flanges effectively guides the overflowing adhesive to the outer surface of the insulating film 400. Specifically, the structural characteristics of the first and second flanges allow the adhesive to flow along the edges of the flanges when compressed, rather than overflowing directly from the edges of the cover patch 300. This not only prevents adhesive from overflowing into the cell interior or other sensitive areas but also ensures a clean appearance and stable performance of the cell.

[0035] To meet the bonding strength requirements of the insulating film 400, the bending length of both the first and second flanges on the cell cover 200 is greater than or equal to 2mm. This length ensures sufficient contact area between the flanges and the cell cover 200. Furthermore, the longer flange length makes the connection between the insulating film 400 and the cell cover 200 more secure. During the bonding process, the adhesive layer 310 adheres fully to both the flanges and the cell cover 200, providing sufficient bonding strength. This helps prevent the cover patch 300 from detaching due to external force or vibration during use, ensuring the long-term stable operation of the cell.

[0036] To enhance the bonding strength of the insulating film 400, the length of the first flange bonded to the adhesive layer 310 is greater than or equal to 0.5 mm. This length ensures sufficient contact area between the flange and the adhesive layer 310. During bonding, the adhesive layer 310 adheres fully to both the first flange and the cell cover plate 200, providing adequate bonding strength. This effectively prevents the insulating film 400 from detaching due to external force or vibration during use, ensuring the long-term stable operation of the cell.

[0037] Under normal circumstances, the length of the second flange bonded to the adhesive layer 310 is also greater than or equal to 0.5 mm. Sufficient contact area exists between the second flange and the adhesive layer 310, further enhancing the bonding strength of the insulating film 400. This prevents electrical short circuits or mechanical damage to the insulating film 400 due to weak bonding during the assembly and use of the battery cell.

[0038] To reduce adhesive overflow, in some embodiments, such as Figure 4 and Figure 5 As shown, the adhesive layer 310 is positioned at the center of the cover plate patch 300 on the side closest to the housing 100. This arrangement allows the adhesive layer 310 to be distributed more evenly during the bonding process, preventing excessive concentration of the adhesive layer 310 at the edges. Because the adhesive layer 310 is in the center, the pressure distribution during bonding is more uniform, thereby reducing the accumulation of adhesive at the edges and lowering the risk of adhesive overflow.

[0039] When the cover plate patch 300 is adhered to the cell cover plate 200 and the flanged portion 410 of the insulating film 400 via the adhesive layer 310, the design of the adhesive layer 310 at the center position allows the adhesive to spread evenly in all directions when pressure is applied. This uniform diffusion method allows the adhesive to better fill the tiny unevenness of the bonding surface, while avoiding excessive accumulation of adhesive in the edge areas.

[0040] In some embodiments, the distance between the outer contour boundary of the adhesive layer 310 and the corresponding edge of the cover plate patch 300 is 0.2 mm to 1 mm. This distance is the minimum straight-line distance from the projected boundary of the adhesive layer 310 on the corresponding plane of the cover plate patch 300 to the edge of the cover plate patch 300. Within this range, the adhesive strength between the adhesive layer 310 and the cover plate patch 300 is ensured, while avoiding adhesive overflow problems caused by excessive distance. The minimum distance of 0.2 mm can prevent the adhesive layer 310 from over-expanding during the bonding process, while the maximum distance of 1 mm ensures that the adhesive layer 310 has sufficient space for uniform diffusion.

[0041] In other embodiments, to reduce adhesive overflow, the adhesive layer thickness in the central region of the adhesive layer 310 can be set to be greater than that in the edge regions, thus creating a gradient in adhesive layer thickness. Because the adhesive layer is thicker in the central region and thinner at the edges, when the adhesive is compressed during bonding, the peripheral adhesive will not spread excessively towards the edges, effectively reducing adhesive overflow. Simultaneously, the thicker adhesive layer in the central region provides stronger adhesion, ensuring a tight bond between the cover plate patch 300 and the cell cover plate 200 and the flanged portion 410 of the insulating film 400. The thinner adhesive layer at the edges does not affect the overall bonding strength, as the adhesive force in the central region is sufficient to support the entire cover plate patch 300.

[0042] Based on the above embodiments, in some embodiments, such as Figures 1 to 5 As shown, the thickness of the cover plate patch 300 is between 0.1 mm and 0.5 mm. This thickness range ensures that the cover plate patch 300 provides sufficient protection and insulation performance without increasing the overall weight and volume of the battery cell due to excessive thickness, or affecting its mechanical strength and durability due to excessive thinness. The thickness of the cover plate patch 300 is preferably 0.15 mm. This thickness makes the cover plate patch 300 easy to process and install during production, and effectively resists the influence of external environments such as vibration and temperature changes during the use of the battery cell.

[0043] The adhesive layer 310 has a thickness of 0.05 mm to 0.3 mm. This range ensures that the adhesive layer 310 provides sufficient adhesive strength during the bonding process, while avoiding problems such as excess adhesive due to excessive thickness or poor bonding due to insufficient thickness. Preferably, the thickness of the adhesive layer 310 is 0.15 mm. This thickness allows for the formation of a uniform and firm adhesive layer between the cover plate patch 300, the cell cover plate 200, and the flanged portion 410 of the insulating film 400, ensuring the stability and reliability of the cell during use. This thickness of adhesive layer 310 not only effectively fills minor unevenness on the bonding surface but also buffers external stress to a certain extent, extending the lifespan of the cell.

[0044] Based on the above embodiments, in some embodiments, such as Figures 1 to 5 As shown, the cover plate patch 300 is one of PC plastic patch, PET plastic patch or PE plastic patch, and the insulating film 400 is blue film.

[0045] Polycarbonate (PC) plastic possesses high strength, high transparency, and good heat resistance. It can withstand significant mechanical stress and temperature changes while maintaining excellent electrical insulation properties. Using PC plastic patches in the battery cell effectively protects the cell cover 200 from external mechanical damage while providing good insulation. The heat resistance of PC material allows it to operate stably in high-temperature environments, extending the battery cell's lifespan.

[0046] Polyethylene terephthalate (PET) plastic possesses excellent electrical insulation properties, mechanical strength, and chemical resistance. It also exhibits low water absorption, enabling it to maintain stable performance in humid environments. PET plastic patches within the battery cell provide reliable insulation protection while resisting the corrosive effects of environmental chemicals. Its low water absorption allows the battery cell to maintain good performance even in humid environments, improving its environmental adaptability.

[0047] Polyethylene (PE) plastic possesses excellent flexibility, chemical resistance, and electrical insulation properties. It effectively cushions external mechanical impacts, protecting the internal structure of the battery cell. The flexibility of the PE plastic patch allows it to adapt to minor deformations of the battery cell during use, providing excellent cushioning protection. Simultaneously, its chemical resistance ensures the stability of the battery cell in various environments, extending its service life.

[0048] The insulating film 400 is preferably a blue film. Using a blue film as the insulating film 400 in the battery cell can effectively protect the internal structure of the cell from external environmental influences, such as moisture, dust, and chemical corrosion. The environmental resistance of the blue film allows it to maintain good insulation performance during the long-term use of the cell, ensuring the safety and reliability of the cell. The flexibility and mechanical strength of the blue film allow it to adapt to changes in the shape and size of the cell, providing comprehensive insulation protection.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell, characterized in that, include: The shell has a receiving cavity; The cell electrode assembly is disposed within the receiving cavity; A cell cover plate is installed at the opening of the receiving cavity; An insulating film is wrapped around the outer surface of the housing and has a flanged portion extending to the cell cover plate; A cover plate patch, wherein one side of the cover plate patch is provided with an adhesive layer that does not completely cover the side, and the cover plate patch is adhered to the flange and the cell cover plate through the adhesive layer.

2. The battery cell according to claim 1, characterized in that, The insulating film forms a receiving space with an opening on one side for covering the housing, and at least one side of the opening is bent to form the flange portion arranged on the cell cover plate.

3. The battery cell according to claim 2, characterized in that, The flanged portion includes: a first flange and a second flange; Both opposite ends of the opening are bent to form first flanges arranged opposite to each other along the length direction of the cell cover plate, and both other opposite ends of the opening are bent to form second flanges arranged opposite to each other along the width direction of the cell cover plate. The cover plate patch is attached to the first flange, the second flange, and the battery cell cover plate via the adhesive layer.

4. The battery cell according to claim 3, characterized in that, The bending lengths of both the first and second flanges on the cell cover plate are greater than or equal to 2 mm.

5. The battery cell according to claim 4, characterized in that, The first flange is bonded to the adhesive layer for a length greater than or equal to 0.5 mm, and / or the second flange is bonded to the adhesive layer for a length greater than or equal to 0.5 mm.

6. The battery cell according to claim 1, characterized in that, The adhesive layer is located at the center of the cover plate patch near the housing.

7. The battery cell according to claim 6, characterized in that, The distance between the outer contour boundary of the adhesive layer and the corresponding edge of the cover plate patch is 0.2 mm to 1 mm; The distance is the minimum straight-line distance from the projection boundary of the adhesive layer on the plane corresponding to the cover plate patch to the edge of the cover plate patch.

8. The battery cell according to claim 1, characterized in that, The adhesive layer thickness in the central region is greater than that in the edge region.

9. The battery cell according to any one of claims 1-8, characterized in that, The thickness of the cover plate patch is 0.1 mm to 0.5 mm, and the thickness of the adhesive layer is 0.05 mm to 0.3 mm.

10. The battery cell according to any one of claims 1-8, characterized in that, The cover plate patch is one of PC plastic patch, PET plastic patch or PE plastic patch, and the insulating film is blue film.

Images