Battery upper cover, battery and battery pack

Abstract

The utility model discloses a battery upper cover, a battery and a battery pack, the battery upper cover comprises a cover body and a foam part, the surface of the cover body is provided with a convex structure, and the foam part at least partially covers the convex structure; the foam piece comprises a main body part and extending parts arranged at the two ends of the main body part in the first direction, a first cutting line extending in the first direction is arranged in the main body part, and a second cutting line extending in the second direction is arranged at the connecting position between the main body part and the extending parts. The first cutting-off line is arranged on the main body part of the foam piece, the stress generated in the first direction when the foam piece is attached to the cambered surface of the protruding structure can be released, meanwhile, the second cutting-off line is arranged at the connecting position of the main body part and the extending part of the foam piece, the stress in the second direction when the foam piece is attached to the cambered surface of the protruding structure can be released, and the stress generated in the second direction can be released. In addition, combination points between the foam piece and the cambered surface of the protruding structure are increased, the bonding effect between the foam piece and the protruding structure is improved, and therefore the problem that the foam piece is prone to upwarp or bulge is effectively solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery packaging, and particularly relates to a battery upper cover, a battery and a battery pack. BACKGROUND

[0002] With the advent of the mobile terminal era, intelligent mobile products are constantly updated and iterated, and in recent years, intelligent electronic products such as tablets and notebooks have developed rapidly.

[0003] In the related art, the battery in the intelligent electronic product is prone to abnormal noise during the pressing test. In the related art, the purpose of noise reduction is achieved by attaching foam to the abnormal noise. However, when the foam is attached to the surface of a structure having an arc, it is prone to warping or bulging. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a battery upper cover, a battery and a battery pack, which can solve the problem that the foam piece is prone to warping or bulging when attached to the surface of a structure having an arc.

[0005] To solve the above technical problems, the application is implemented as follows:

[0006] In a first aspect, the application embodiment provides a battery upper cover, comprising: a cover body and a foam piece, the cover body surface is provided with a convex structure, and the foam piece is at least partially covered on the convex structure.

[0007] The foam piece comprises a main body part and an extension part provided at both ends of the main body part along a first direction, the main body part is provided with a first cutting line extending along the first direction, and the connection part between the main body part and the extension part is provided with a second cutting line extending along a second direction, and the first direction is perpendicular to the second direction.

[0008] The main body part is attached to the convex structure and at least partially extends to the cover body surface on both sides of the convex structure along the second direction; and the extension part is attached to both ends of the convex structure and at least partially extends to the cover body surface at both ends of the convex structure along the first direction.

[0009] Optionally, an edge at the junction between the extension part and the main body part is provided with an opening.

[0010] Optionally, the extension part comprises a first end and a second end arranged away from each other along the first direction, the first end is connected to the main body part, and the width of the second end along the second direction is greater than the width of the first end along the second direction.

[0011] Optionally, from the first end to the second end, the width of the extension part along the second direction gradually increases.

[0012] Optionally, the first cutting line is provided with a plurality of first cutting lines, and the plurality of first cutting lines are arranged at intervals along the second direction.

[0013] Optionally, the second cutting line comprises a plurality of sub-line segments, and the plurality of sub-line segments are arranged at intervals along the second direction to form the second cutting line.

[0014] Optionally, one side of the foam piece towards the cover is provided with an adhesive layer, and the first cutting line and the second cutting line both penetrate through the adhesive layer, and the adhesive layer is adhesively fixed with the protruding structure.

[0015] Optionally, the foam piece is axially symmetrical along the first direction; and / or, the foam piece is axially symmetrical along the second direction.

[0016] In a second aspect, an embodiment of the present application provides a battery upper cover.

[0017] In a third aspect, an embodiment of the present application provides a battery pack, comprising the battery described above.

[0018] In the embodiments of the present application, by arranging the first cutting line on the main body part of the foam piece, the stress generated along the first direction when the foam piece is attached to the curved surface of the protruding structure can be released, and by arranging the second cutting line at the connection position between the main body part and the extension part of the foam piece, the stress along the second direction when the foam piece is attached to the curved surface of the protruding structure can be released, so that when the foam piece is attached to the protruding structure, the problem of warping or falling off of the foam piece due to stress concentration between the foam piece and the protruding structure is reduced; and the first cutting line and the second cutting line can also increase the bonding points between the foam piece and the protruding structure, not only making the foam piece better attached to the protruding structure, but also further improving the adhesion between the foam piece and the protruding structure, thereby effectively solving the problem of easy warping or bulging of the foam piece.

[0019] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0021] Figure 1 is a structure schematic view of a battery upper cover to which a foam piece has been attached according to an embodiment of the present application;

[0022] Figure 2 is a structure schematic view of a battery upper cover to which a foam piece has not been attached according to an embodiment of the present application;

[0023] Figure 3 is a structural schematic view of a foam piece according to an embodiment of the present application;

[0024] Figure 4 is a cross-sectional schematic view of a cooperation structure of a foam piece and an adhesive layer according to an embodiment of the present application.

[0025] Reference Signs:

[0026] 100: cover body; 110: protruding structure; 200: foam piece; 210: main body part; 211: first cutting line; 212: second cutting line; 220: extension part; 221: opening; 222: first end; 223: second end; X: first direction; Y: second direction; C1: first center line; C2: second center line; 300: adhesive layer. DETAILED DESCRIPTION

[0027] Embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components have the same or similar reference numbers throughout the several views. The embodiments described below are examples in which the present application is applied, and are for the purpose of explanation only, and are not to be understood as limiting the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative work fall within the scope of the present application.

[0028] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0029] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] The battery cover, battery, and battery pack provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0032] like Figures 1 to 3 As shown, a battery cover according to some embodiments of this application includes: a cover body 100 and a foam component 200. The surface of the cover body 100 is provided with a protrusion structure 110, and the foam component 200 at least partially covers the protrusion structure 110. The foam component 200 includes a main body portion 210 and extension portions 220 provided at both ends of the main body portion 210 along a first direction X. A first cutting line 211 extending along the first direction X is provided in the main body portion 210, and a second cutting line 212 extending along a second direction Y is provided at the connection between the main body portion 210 and the extension portions 220. The first direction X is perpendicular to the second direction Y.

[0033] The main body 210 is attached to the raised structure 110 and extends at least partially to the surface of the cover 100 on both sides of the raised structure 110 along the second direction Y; the extension 220 is attached to both ends of the raised structure 110 and extends at least partially to the surface of the cover 100 on both ends of the raised structure 110 along the first direction X.

[0034] In the embodiments of this application, by providing a first cutting line 211 on the main body portion 210 of the foam component 200, the stress generated along the first direction X when the foam component 200 is attached to the arc surface of the protruding structure 110 can be released. At the same time, by providing a second cutting line 212 at the connection position between the main body portion 210 and the extension portion 220 of the foam component 200, the stress along the second direction Y when the foam component 200 is attached to the arc surface of the protruding structure 110 can be released. In this way, when the foam component 200 is attached to the protruding structure 110, the problem of lifting or falling off caused by stress concentration between the foam component 200 and the protruding structure 110 is reduced.

[0035] It can be understood that gaps are formed at the first cutting line 211 and the second cutting line 212, so that the foam piece 200 at the edge position of the gaps can increase the bonding points between the foam piece 200 and the convex structure 110, so that the foam piece 200 can be better attached to the convex structure 110, and the adhesion between the foam piece 200 and the convex structure 110 can be further improved, thereby effectively solving the problem that the foam piece 200 is easy to be warped or bulged.

[0036] In addition, according to the battery upper cover provided in the present application, the firmness of the adhesion between the foam piece 200 and the surface of the cover body 100 does not need to be improved by increasing the overall area of the foam piece 200, so that the surface area of the cover body 100 occupied by the foam piece 200 can be reduced, and the attachment of other components such as a battery trademark is facilitated, and the use cost of the foam piece 200 can be reduced.

[0037] In specific embodiments, the battery upper cover comprises a cover body 100 and a foam piece 200, the surface of the cover body 100 is provided with a convex structure 110, the foam piece 200 is attached to the convex structure 110, and the length of the foam piece 200 along the first direction X is greater than the length of the convex structure 110 along the first direction X, and the width of the foam piece 200 along the second direction Y is greater than the width of the convex structure 110 along the second direction Y, so that the foam piece 200 can completely cover the surface of the convex structure 110. The convex structure 110 comprises a first region and a second region, the main body part 210 of the foam piece 200 corresponds to the first region, the extension part 220 of the foam piece 200 corresponds to the second region, the length of the first cutting line 211 along the first direction X can be equal to the length of the first region of the convex structure 110 along the first direction X, and the width of the second cutting line 212 along the second direction Y is less than the width of the first region of the convex structure 110 along the second direction Y.

[0038] It can be understood that the gap formed at the first cutting line 211 should not be too large, when the gap is too large, the foam at the edge position of the gap is easy to be warped after the foam piece 200 is attached to the convex structure 110, so that the adhesion between the foam piece 200 and the convex structure 110 is reduced, and the strength of the foam piece 200 is also reduced, and the foam piece 200 is easy to be pulled apart if a large pulling force is applied during the attachment of the foam piece 200 to the convex structure 110. It should be noted that the lengths of the first cutting line 211 and the second cutting line 212 can be flexibly set according to actual needs, and the present embodiments do not limit them.

[0039] It should be noted that the convex structure 110 can be a reinforcing rib, which can improve the strength of the battery upper cover, and the convex structure 110 can also be other components with curvature, and the present embodiments do not limit them.

[0040] Optionally, as shown in Figure 3 The edge at the joint between the extension 220 and the main body 210 is provided with an opening 221.

[0041] In the embodiment of the present application, by providing the opening 221 at the edge at the joint between the extension 220 and the main body 210 of the foam piece 200, the extension 220 of the foam piece 200 can be prevented from being wrinkled during the process of being attached to the convex structure 110, so that the extension 220 of the foam piece 200 can better adapt to the arc surface of the convex structure 110, and the bonding stability and reliability between the extension 220 of the foam piece 200 and the convex structure 110 are enhanced, thereby effectively solving the problem of the extension 220 of the foam piece 200 being warped during the process of being attached to the convex structure 110.

[0042] It can be understood that the shape of the opening 221 at the joint between the extension 220 and the main body 210 can be flexibly set according to requirements, for example, the opening 221 can be provided in a U-shaped, V-shaped or L-shaped structure, and the present embodiment does not limit the same.

[0043] Optionally, as shown in Figure 3 The extension 220 includes a first end 222 and a second end 223 arranged away from each other along the first direction X, the first end 222 is connected to the main body 210, and the width of the second end 223 along the second direction Y is greater than the width of the first end 222 along the second direction Y.

[0044] In the embodiment of the present application, by setting the width of the second end 223 of the extension 220 along the second direction Y to be greater than the width of the first end 222 along the second direction Y, not only can the extension 220 of the foam piece 200 be more attached to the arc surface of the convex structure 110, but also when the second end 223 of the extension 220 is pasted to the surface of the cover 100, the width of the second end 223 is greater, which can increase the contact area between the second end 223 and the surface of the cover 100, so that the foam piece 200 and the cover 100 are bonded more firmly.

[0045] Specifically, the extension 220 of the foam piece 200 includes a first end and a second end 223 arranged away from each other along the first direction X, the first end 222 is connected to the main body 210 and completely covers the surface of the convex structure 110, and the second end 223 is at least partially connected to the surface of the cover 100. When the width of the second end 223 along the second direction Y is greater, the contact area between the foam piece 200 and the surface of the cover 100 can be increased, so that the bonding stability between the foam piece 200 and the convex structure 110 is improved, and the problem of the foam piece 200 being warped or separated is effectively reduced.

[0046] Optionally, as shown in Figure 3As shown, from the first end 222 to the second end 223, the width of the extension 220 gradually increases along the second direction Y.

[0047] In this embodiment, by setting the width of the extension 220 from the first end 222 to the second end 223 along the second direction Y to gradually increase, the extension 220 of the foam part 200 can better fit the arc surface of the protruding structure 110, avoiding wrinkles when the extension 220 of the foam part 200 is fitted to the protruding structure 110. Furthermore, when the width of the second end 223 is larger, the contact area between the extension 220 of the foam part 200 and the surface of the cover 100 increases, thereby strengthening the adhesion between the foam part 200 and the cover 100, further reducing the problem of the foam part 200 lifting or detaching. On the other hand, the gradual increase in width of the extension 220 of the foam part 200 from the first end 222 to the second end 223 along the second direction Y is a simple structural design that is easy to implement during processing, improving production efficiency and quality pass rate.

[0048] Optionally, such as Figure 3 As shown, there are multiple first cutting lines 211, and the multiple first cutting lines 211 are arranged at intervals along the second direction Y.

[0049] In this embodiment, by setting multiple first cutting lines 211, the arc surface where the foam component 200 and the raised structure 110 are attached can be divided into multiple relatively small areas along the second direction Y. This further releases the stress generated when the foam component 200 is attached to the arc surface of the raised structure 110, reduces stress concentration in areas with large curvature, and allows multiple smaller areas to better adapt to the arc surface of the raised structure 110, effectively reducing the problem of the foam component 200 easily lifting or detaching after being attached to the raised structure 110. In addition, by setting multiple first cutting lines 211, the multiple first cutting lines 211 can serve as additional support points between the foam component 200 and the raised structure 110. These support points can form the bonding points between the foam component 200 and the raised structure 110, thereby increasing the contact area between the foam component 200 and the raised structure 110, enhancing the adhesion between the foam component 200 and the raised structure 110, and allowing the foam component 200 to be more firmly attached to the arc surface of the raised structure 110.

[0050] Specifically, four first cutting lines 211 can be set, and the four first cutting lines 211 are arranged at intervals along the second direction Y. The four first cutting lines 211 are symmetrically arranged on both sides of the first direction X with two lines as a group. The interval between adjacent first cutting lines 211 can be flexibly set according to the actual size of the foam part 200. This embodiment does not limit it.

[0051] It can be understood that the number of the first cutting lines 211 cannot be too small. When the number of the first cutting lines 211 is too small, the stress generated when the foam piece 200 is attached to the curved surface of the protruding structure 110 cannot be effectively released, and more bonding points cannot be provided between the foam piece 200 and the protruding structure 110. In this way, the foam piece 200 and the protruding structure 110 cannot be well attached, and the adhesion between the foam piece 200 and the protruding structure 110 is also small, so that problems such as wrinkles or warping are easily generated.

[0052] Specifically, the number of the first cutting lines 211 cannot be too large. When the number of the first cutting lines 211 is too large, the gaps formed by the first cutting lines 211 are correspondingly increased, so that the contact area between the foam piece 200 and the protruding structure 110 is correspondingly reduced, thereby reducing the adhesion between the foam piece 200 and the protruding structure 110. At the same time, too many first cutting lines 211 can significantly reduce the strength of the foam piece 200, and the maximum tensile force that the foam piece 200 can withstand is reduced. During the process of attaching the foam piece 200 to the protruding structure 110, the foam piece 200 is easily torn and broken by the operator, which not only reduces the production efficiency of the product, but also increases the use cost of the foam piece 200.

[0053] Optionally, as shown in Figure 3 The second cutting line 212 includes a plurality of sub-line segments, and the plurality of sub-line segments are arranged at intervals along the second direction Y to form the second cutting line 212.

[0054] According to some embodiments of the present application, by arranging a plurality of sub-line segments to form the second cutting line 212, the curved surface of the foam piece 200 and the protruding structure 110 attached along the second direction Y can be divided into a plurality of relatively small areas, the stress generated when the foam piece 200 and the protruding structure 110 are attached along the second direction Y is further released, and the bonding points of the curved surface of the foam piece 200 and the protruding structure 110 are further increased, so that the foam piece 200 can be better attached to the curved surface of the protruding structure 110 along the second direction Y, thereby improving the adhesion between the foam piece 200 and the protruding structure 110, and making the foam piece 200 and the protruding structure 110 more firmly bonded.

[0055] It should be noted that the number of sub-line segments cannot be too large. When the number of sub-line segments is too large, the strength of the foam piece 200 will be significantly reduced, which will cause the foam piece 200 to be torn and broken by the operator during operation, thereby affecting the production efficiency of the product and increasing the material cost of the foam piece 200.

[0056] Optionally, as shown in Figure 4As shown, the foam piece 200 is provided with an adhesive layer 300 on the side facing the cover 100, and the first cutting line 211 and the second cutting line 212 both penetrate the adhesive layer 300, and the adhesive layer 300 is fixedly attached to the convex structure 110.

[0057] In the embodiments of the present application, by providing the adhesive layer 300 on the side of the foam piece 200 facing the cover 100, the foam piece 200 can be fixedly attached to the surface of the convex structure 110, and by providing the first cutting line 211 and the second cutting line 212 both penetrating the adhesive layer 300, stress concentration caused when the adhesive layer 300 is attached to the curved surface of the convex structure 110 can be avoided, thereby affecting the attachment effect of the foam piece 200 and the convex structure 110.

[0058] It can be understood that the adhesive layer 300 can be double-sided tape or an adhesive, the double-sided tape has good flatness, which can further improve the attachment effect of the foam piece 200 and the convex structure 110, and the adhesive has good adhesive effect and low cost. Of course, the specific type of the adhesive layer 300 can be flexibly selected according to actual process requirements, and the embodiments are not limited thereto.

[0059] Optionally, as shown in Figure 3 The foam piece 200 is axially symmetrical along the first direction X.

[0060] According to some embodiments of the present application, the foam piece 200 has a first center line C1 along the first direction X, and the foam piece 200 is axially symmetrical with the first center line C1 as the axis of symmetry.

[0061] Optionally, as shown in Figure 3 The foam piece 200 is axially symmetrical along the second direction Y.

[0062] According to some embodiments of the present application, the foam piece 200 has a second center line C2 along the second direction Y, and the foam piece 200 is axially symmetrical with the second center line C2 as the axis of symmetry. Specifically, when the first cutting line 211, the second cutting line 212 and the cutout are provided on the foam piece 200, the foam piece 200 which is axially symmetrical with the first center line C1, or / and the second center line C2 as the axis of symmetry still has good structural stability. In the actual production operation process, the foam piece 200 will not be locally broken due to uneven stress, thereby reducing the use cost of the foam piece 200; in addition, the axial symmetrical structure design makes the operator not need to spend extra time to distinguish the pasting direction of the foam piece 200, which provides convenience for the work of the operator, and further improves the production efficiency of the product.

[0063] Optionally, the embodiments of the present application also provide a battery comprising the battery cover in the above embodiments.

[0064] In the embodiment of the present application, by arranging the first cutting line 211 on the main body part 210 of the foam piece 200, the stress generated along the first direction X when the arc surface of the foam piece 200 is attached to the convex structure 110 can be released, and by arranging the second cutting line 212 at the connection position of the main body part 210 and the extension part 220 of the foam piece 200, the stress along the second direction Y when the arc surface of the foam piece 200 is attached to the convex structure 110 can be released, so that when the foam piece 200 is attached to the convex structure 110, the problem of warping or falling off between the foam piece 200 and the convex structure 110 due to stress concentration is reduced; and the first cutting line 211 and the second cutting line 212 can also increase the bonding points between the foam piece 200 and the convex structure 110, so that the foam piece 200 can be better attached to the convex structure 110, and the adhesion between the foam piece 200 and the convex structure 110 is further improved, thereby effectively solving the problem of easy warping or bulging of the foam piece 200.

[0065] Specifically, the battery comprises a battery cell, a battery shell and a battery upper cover. The battery shell is provided with a receiving cavity having a cavity opening. The battery cell is loaded into the receiving cavity from the cavity opening. The battery upper cover covers the cavity opening and is detachably connected with the battery shell, so that the battery upper cover and the battery shell protect the battery cell and prevent external impurities from entering the receiving cavity to affect the performance of the battery. In addition, the convex structure 110 in the cover body 100 can improve the strength of the battery upper cover, thereby improving the safety of the battery and prolonging the service life of the battery.

[0066] Optionally, the embodiment of the present application further provides a battery pack comprising the battery upper cover in the above embodiment or the battery in the above embodiment.

[0067] In the embodiment of the present application, by arranging the first cutting line 211 on the main body part 210 of the foam piece 200, the stress generated along the first direction X when the arc surface of the foam piece 200 is attached to the convex structure 110 can be released, and by arranging the second cutting line 212 at the connection position of the main body part 210 and the extension part 220 of the foam piece 200, the stress along the second direction Y when the arc surface of the foam piece 200 is attached to the convex structure 110 can be released, so that when the foam piece 200 is attached to the convex structure 110, the problem of warping or falling off between the foam piece 200 and the convex structure 110 due to stress concentration is reduced; and the first cutting line 211 and the second cutting line 212 can also increase the bonding points between the foam piece 200 and the convex structure 110, so that the foam piece 200 can be better attached to the convex structure 110, and the adhesion between the foam piece 200 and the convex structure 110 is further improved, thereby effectively solving the problem of easy warping or bulging of the foam piece 200.

[0068] In some embodiments, the battery pack comprises a box, a plurality of battery cells and the battery upper cover in the above embodiments, the box has a cavity, the cavity has an opening, the plurality of battery cells can be loaded into the cavity from the opening, and the battery upper cover covers the opening, and the battery upper cover is detachably connected with the box, so that the battery upper cover and the box form a protective effect on the battery cells, and external impurities are prevented from entering the cavity to affect the safety of the battery pack.

[0069] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery upper cover, characterized in that, The battery upper cover comprises: a cover body and a foam piece, the cover body is provided with a protruding structure, and the foam piece at least partially covers the protruding structure; the foam piece comprises a main body part and extension parts arranged at both ends of the main body part along a first direction, the main body part is provided with a first cutting line extending along the first direction, and the connection part between the main body part and the extension part is provided with a second cutting line extending along a second direction, the first direction being perpendicular to the second direction; the main body part is attached to the protruding structure and at least partially extends to the surface of the cover body on both sides of the protruding structure along the second direction; and the extension parts are attached to both ends of the protruding structure and at least partially extend to the surface of the cover body at both ends of the protruding structure along the first direction.

2. The battery upper cover according to claim 1, characterized in that, an opening is arranged at the edge of the connection part between the extension part and the main body part.

3. The battery upper cover according to claim 1, wherein, the extension part comprises a first end and a second end arranged away from each other along the first direction, the first end is connected to the main body part, and the width of the second end along the second direction is greater than the width of the first end along the second direction.

4. The battery upper cover according to claim 3, characterized in that, from the first end to the second end, the width of the extension part along the second direction gradually increases.

5. The battery upper cover according to claim 1, wherein, the first cutting line is provided with a plurality of first cutting lines arranged at intervals along the second direction.

6. The battery upper cover according to claim 1, wherein, the second cutting line comprises a plurality of sub-line segments, and the plurality of sub-line segments are arranged at intervals along the second direction to form the second cutting line.

7. The battery upper cover according to any one of claims 1-6, characterized in that, the foam piece is provided with an adhesive layer on the side facing the cover body, the first cutting line and the second cutting line penetrate the adhesive layer, and the adhesive layer is adhered and fixed to the protruding structure.

8. The battery upper cover according to claim 7, characterized in that, the foam piece is axially symmetrical along the first direction; and / or, the foam piece is axially symmetrical along the second direction.

9. A battery comprising the battery upper cover according to any one of claims 1-8.

10. A battery pack comprising the battery upper cover according to any one of claims 1-8; or, comprising the battery according to claim 9.

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