Cover plate and battery

Abstract

Provided in the present application are a cover plate and a battery. The cover plate is applied to the battery. The cover plate comprises: the cover plate being provided with a plurality of ribs, wherein the plurality of ribs all extend outward from the center of the cover plate in the radial direction of the cover plate and are distributed in the circumferential direction of the cover plate; and the cover plate being further provided with a plurality of indented grooves, wherein an indented groove is provided between every two adjacent ribs, and the indented grooves are configured to rupture when the internal pressure of the battery exceeds a preset value.

Description

Cover plate and battery

[0001]

[0002] The present application claims priority to the Chinese patent application No. 202422412896.6, filed on September 30, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a cover plate and a battery. BACKGROUND

[0004] The battery is generally provided with a cover plate as a seal. In the related art, the cover plate is generally flat or has a reinforcing rib added on the basis of the flat structure. To cope with the situation of continuous increase of the internal pressure of the battery during use of the battery, the cover plate of some batteries is also provided with a valve opening structure. The valve opening structure can tear the cover plate when the internal pressure of the battery exceeds the pressure bearing capacity of the cover plate, so that the inside of the battery can be communicated with the outside. SUMMARY

[0005] However, the valve opening structure of the cover plate of some batteries in the related art is arranged on the reinforcing rib, which greatly reduces the strength of the cover plate.

[0006] The present application provides a cover plate applied to a battery, comprising:

[0007] The cover plate is provided with a plurality of ribs, each of the plurality of ribs extending outward along the radial direction of the cover plate from the center of the cover plate, and the plurality of ribs are distributed along the circumferential direction of the cover plate.

[0008] The cover plate is also provided with a plurality of score grooves, each of the score grooves being arranged between two adjacent ribs, and the score groove is arranged to be broken under the action of the internal pressure of the battery.

[0009] The present application also provides a battery, comprising:

[0010] A shell is provided with a receiving chamber;

[0011] A winding core is arranged in the receiving chamber; and

[0012] The cover plate is arranged on the shell to seal the receiving chamber, as described in the possible implementation manners of the present application. ADVANTAGEOUS EFFECTS

[0013] The cover plate provided by the application can effectively improve the structural strength of the cover plate in the radial direction and the circumferential direction by arranging a plurality of radially extending ribs in the radial direction of the cover plate and distributing the plurality of ribs in the circumferential direction of the cover plate. The cover plate region between the adjacent two ribs is provided with a score groove, and a plurality of score grooves are distributed in the circumferential direction of the cover plate. The thickness of the cover plate part corresponding to the score groove is smaller than the thickness of other parts of the cover plate. Therefore, the cover plate can be torn along the score groove when the internal pressure of the battery exceeds the allowable strength value of the cover plate without reducing the strength of the ribs, which is beneficial to the stable release of the internal pressure.

[0014] The battery provided by the application adopts the cover plate described above. When the cover plate is assembled in the shell, the side of the cover plate provided with the score groove faces the roll core, and the cover plate is arranged in the shell to close the accommodation chamber. Therefore, at least part of the internal pressure of the battery can be concentrated in the score groove. As the internal pressure of the battery increases, the internal pressure of the battery can cause the cover plate to crack in the direction of the score groove, thereby playing a pressure relief protection role. BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a structural schematic diagram of one side of a cover plate provided by a possible implementation manner of the application.

[0016] FIG. 2 is a structural schematic diagram of the other side of the cover plate provided by the possible implementation manner of the application.

[0017] FIG. 3 is a front projection structural schematic diagram of one side of the cover plate provided by the possible implementation manner of the application.

[0018] FIG. 4 is a sectional view schematic diagram of the cover plate cut along the A-A direction in FIG. 3.

[0019] FIG. 5 is an enlarged schematic diagram of the B part in FIG. 4.

[0020] FIG. 6 is a structural schematic diagram of the cover plate provided by a possible implementation manner of the application.

[0021] FIG. 7 is a structural schematic diagram of a battery provided by the possible implementation manner of the application.

[0022] FIG. 8 is a block diagram of the battery provided by the possible implementation manner of the application.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 100, battery; 10, cover plate; x, center of the cover plate; y, radial direction of the cover plate; z, circumferential direction of the cover plate; 11, rib; 111, side wall; 112, end wall; 113, top wall; 12, score groove; 120, groove wall; 121, first score groove; 122, second score groove; 123, third score groove; 124, fourth score groove; 125, fifth score groove; 13, cover body; 14, annular protrusion; 20, shell; 21, accommodation chamber; 30, roll core. Embodiments of the present application

[0025] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of the present embodiment, the terms "up", "down", "left", "right", "front", "back" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does 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 a limitation on the present application. In addition, the terms "first" and "second" are used to distinguish the description and have no special meaning.

[0028] The battery is generally provided with a cover plate as a seal. In the related art, the cover plate is generally a flat plate type or a structure based on the addition of a reinforcing rib to the flat plate type. In order to cope with the situation of continuous increase of the internal pressure of the battery during use of the battery, the cover plate of some batteries is also provided with a valve opening structure. The valve opening structure can tear the cover plate when the internal pressure of the battery exceeds the pressure bearing capacity of the cover plate, so that the inside of the battery can communicate with the outside. However, in the related art, the cover plate of some batteries has the valve opening structure arranged on the reinforcing rib, which greatly reduces the strength of the cover plate.

[0029] Please refer to FIG. 1 and FIG. 2, FIG. 1 is a structural schematic diagram of one side of the cover plate provided by the embodiment of the present application, and FIG. 2 is a structural schematic diagram of the other side of the cover plate provided by the embodiment of the present application.

[0030] The cover plate 10 provided by the embodiment of the present application can be applied to a battery, and the cover plate 10 comprises: the cover plate 10 is provided with a plurality of rib bodies 11, the plurality of rib bodies 11 all extend outward along the radial direction y of the cover plate 10 from the center x of the cover plate 10, and the plurality of rib bodies 11 are distributed along the circumferential direction z of the cover plate 10. The cover plate 10 is also provided with a plurality of score grooves 12, and each of the score grooves 12 is arranged between two adjacent rib bodies 11, and the score groove 12 is arranged to be capable of being broken under the action of the internal pressure of the battery. The cover plate 10 provided by the embodiment of the present application is provided with a plurality of rib bodies 11 extending along the radial direction y, and the plurality of rib bodies 11 are distributed along the circumferential direction z of the cover plate 10. One of the advantages of this design is that the structural strength of the cover plate 10 in the radial direction y and the circumferential direction z can be effectively improved. The score groove 12 is arranged in the region of the cover plate 10 between the two adjacent rib bodies 11, that is, the plurality of score grooves 12 are distributed along the circumferential direction z of the cover plate 10. The thickness of the part of the cover plate 10 corresponding to the score groove 12 is smaller than the thickness of other parts of the cover plate 10. Therefore, the cover plate 10 can be torn along the score groove 12 when the internal pressure of the battery 100 exceeds the allowable strength value of the cover plate 10 without reducing the strength of the rib body 11, which is conducive to the stable release of the internal pressure of the battery.

[0031] Referring to FIG. 1, the cover plate 10 can comprise a cover body 13, and the rib body 11 is connected to the cover body 13. At least one rib body 11 can comprise two oppositely arranged side walls 111. It should be noted that at least one rib body 11 can comprise two oppositely arranged side walls 111. It can be understood that only one of the plurality of rib bodies 11 can be provided with two oppositely arranged side walls 111, or several of the plurality of rib bodies 11 can be provided with two oppositely arranged side walls 111, or all of the plurality of rib bodies 11 can be provided with two oppositely arranged side walls 111.

[0032] In some embodiments of the present application, at least one side wall 111 can be inclined to the cover body 13, so that the distance between the two side walls 111 gradually decreases from the cover body 13 to the direction away from the cover body 13. For example, one side wall 111 of the rib body 11 can be inclined to the cover body 13, or both side walls 111 of the rib body 11 can be inclined to the cover body 13. Compared with the design scheme in the prior art in which the two side walls 111 are perpendicular to the cover body 13, the rib body 11 designed in this way has better structural strength. Referring to FIG. 1, the rib body 11 can further comprise an end wall 112 and a top wall 113. The end wall 112 is connected to one end of the two side walls 111 away from the center x of the cover plate 10, and the top wall 113 is connected to one side of the two side walls 111 away from the cover body 13. In some embodiments of the present application, the end wall 112 can be curvedly connected to the two side walls 111 to improve the strength of the rib body 11.

[0033] In some embodiments, the top wall 113 can be curvedly connected to the two side walls 111 to improve the strength of the rib body 11.

[0034] For example, the end wall 112 can be curvedly connected with the two side walls 111 to improve the strength of the rib body 11; or the top wall 113 can be curvedly connected with the two side walls 111 to improve the strength of the rib body 11; or the end wall 112 can be curvedly connected with the two side walls 111 and the top wall 113 can be curvedly connected with the two side walls 111 to improve the strength of the rib body 11.

[0035] It can be understood that in some other embodiments, the cover body 13 can be the cover plate 10 itself, and the rib body 11 can be a part of the cover plate 10, that is, the rib body 11 is an integral structure with the cover plate 10, and the rib body 11 can be formed by stamping at least part of the cover plate 10.

[0036] Please refer to FIG. 1, FIG. 3, FIG. 4 and FIG. 5, FIG. 3 is a structure schematic diagram of the front projection of one side of the cover plate provided by the embodiment of the present application, FIG. 4 is a structure schematic diagram of the section of the cover plate cut along the direction of A-A in FIG. 3, and FIG. 5 is an enlarged schematic diagram of part B in FIG. 4.

[0037] The score groove 12 can be obtained by stamping or subtractive process, and the score groove 12 can be a V-shaped groove or a U-shaped groove. The V-shaped groove refers to that the cover plate 10 can have two groove walls 120 intersecting at an angle, and the distance between the two groove walls 120 gradually decreases from the groove opening to the groove bottom, or the V-shaped groove can be formed by concave surface, and the opening of the V-shaped groove gradually decreases from the groove opening to the groove bottom. The U-shaped groove refers to that the cover plate 10 has two oppositely arranged groove walls 120 and a groove bottom connecting the two groove walls 120, and the groove bottom can be a straight surface or a curved surface, and the distance between the two groove walls 120 is constant or changes little from the groove opening to the groove bottom.

[0038] Please continue to refer to FIG. 1. In some embodiments, the at least one score groove 12 includes a first score groove 121 and a second score groove 122, and the first score groove 121 and the second score groove 122 both extend from the edge of the cover plate 10 towards the center x of the cover plate 10, and the distance between the first score groove 121 and the second score groove 122 gradually decreases in the direction close to the center x of the cover plate 10. One of the advantages of this design is that the stress is more concentrated at the end of the first score groove 121 and the second score groove 122 close to each other, and the end close to each other can preferentially break when the internal pressure of the battery is large, and the first score groove 121 and the second score groove 122 will crack in the direction of the edge of the cover plate 10 under the continuous action of the internal pressure of the battery.

[0039] As an optional implementation, the end of the first groove 121 near the center x of the cover plate 10 can be connected to the end of the second groove 122 near the center x of the cover plate 10. When the internal pressure of the battery is large, the connection between the first groove 121 and the second groove 122 will break first to form a crack, and the internal pressure of the battery can be released through the crack. When the internal pressure of the battery is too large, the crack will expand along the edge of the cover plate 10 along the first groove 121 and the second groove 122 under the action of the internal pressure of the battery. At the same time, the part of the cover plate 10 between the first groove 121 and the second groove 122 will bend and deform in the direction away from the battery, and finally a through hole connecting the inner cavity of the battery will be formed between the first groove 121 and the second groove 122.

[0040] As another optional implementation, to reduce stress concentration and improve the internal pressure resistance of the cover plate 10, the scoring groove 12 may further include a third scoring groove 123. One end of the third scoring groove 123 is connected to the end of the first scoring groove 121 near the center x of the cover body 13, and the other end of the third scoring groove 123 is connected to the end of the second scoring groove 122 near the center x of the cover body 13. This design makes the two ends of the third scoring groove 123 the stress concentration points. When the internal pressure of the battery exceeds the cover plate... When the allowable value is 10, the two ends of the third groove 123 will break first. Under the continuous action of the internal pressure of the battery, at one end of the third groove 123, a crack will open along the second groove 122 and the third groove 123. At the same time, at the other end of the third groove 123, another crack will open along the first groove 121 and the third groove 123, thereby forming a through hole between the first groove 121 and the second groove 122 that can communicate with the internal cavity of the battery to release the internal pressure of the battery.

[0041] As another alternative implementation, the groove 12 may also include a fourth groove 124, which is connected to the end of the first groove 121 away from the center x of the cover plate 10. The fourth groove 124 extends toward the second groove 122 so that the portion of the cover plate 10 between the first groove 121 and the second groove 122 can be bent toward the outside of the battery cavity to form a larger opening.

[0042] In some embodiments, the groove 12 may further include a fifth groove 125, which is connected to the end of the second groove 122 away from the third groove 123. The fifth groove 125 extends toward the first groove 121 so that the portion of the cover plate 10 between the first groove 121 and the second groove 122 can be bent toward the outside of the battery cavity to form a larger opening.

[0043] For example, the score groove 12 can further comprise a fourth score groove 124 connected to an end of the first score groove 121 away from the center x of the cover plate 10, and the fourth score groove 124 is arranged to extend towards the second score groove 122.

[0044] In another embodiment, the score groove 12 can further comprise a fifth score groove 125 connected to an end of the second score groove 122 away from the third score groove 123, and the fifth score groove 125 is arranged to extend towards the first score groove 121.

[0045] In another embodiment, the score groove 12 can further comprise a fourth score groove 124 connected to an end of the first score groove 121 away from the center x of the cover plate 10, and the fourth score groove 124 is arranged to extend towards the second score groove 122. The fifth score groove 125 is connected to an end of the second score groove 122 away from the third score groove 123, and the fifth score groove 125 is arranged to extend towards the first score groove 121.

[0046] The advantage of the above design is that it can make the part of the cover plate 10 between the first score groove 121 and the second score groove 122 more easily bend away from the battery, thereby forming a larger hole between the first score groove 121 and the second score groove 122 that can release the pressure inside the battery.

[0047] In some embodiments, the third score groove 123 can extend along the circumferential direction z of the cover plate 10, which can better disperse stress, improve the strength of the cover plate 10, and make the score groove 12 of the cover plate 10 be torn within the desired range of the internal pressure of the battery, avoiding the functional failure of the cover plate 10 due to premature tearing.

[0048] In some embodiments, the fourth score groove 124 can extend along the circumferential direction z of the cover plate 10, which can also better disperse stress, improve the strength of the cover plate 10, and make the score groove 12 of the cover plate 10 be torn within the desired range of the internal pressure of the battery, avoiding the functional failure of the cover plate 10 due to premature tearing.

[0049] In some embodiments, the fifth score groove 125 can extend along the circumferential direction z of the cover plate 10, which can also better disperse stress, improve the strength of the cover plate 10, and make the score groove 12 of the cover plate 10 be torn within the desired range of the internal pressure of the battery, avoiding the functional failure of the cover plate 10 due to premature tearing.

[0050] For example, any one of the third score groove 123, the fourth score groove 124 and the fifth score groove 125 can be arranged along the circumferential direction z of the cover plate 10; in another embodiment, the third score groove 123 is arranged along the circumferential direction z of the cover plate 10, and the fourth score groove 124 is arranged along the circumferential direction z of the cover plate 10; in still another embodiment, the third score groove 123 is arranged along the circumferential direction z of the cover plate 10, the fourth score groove 124 is arranged along the circumferential direction z of the cover plate 10, and the fifth score groove 125 is arranged along the circumferential direction z of the cover plate 10. In the actual implementation process, the corresponding design or adjustment can be made according to the actual demand or actual working condition.

[0051] Some embodiments of the present application can better disperse stress by arranging one or more of the third score groove 123, the fourth score groove 124 and the fifth score groove 125 along the circumferential direction z of the cover plate 10, thereby improving the strength of the cover plate 10 and enabling the score groove 12 of the cover plate 10 to be torn within the desired internal pressure range of the battery, avoiding the functional failure of the cover plate 10 due to premature tearing.

[0052] Please continue to refer to FIG. 1. In some embodiments, the cover plate 10 can also be provided with an annular protrusion 14 located at the center x of the cover plate 10, and each rib body 11 is connected to the annular protrusion 14 at the end close to the center of the cover body 13. By arranging the annular protrusion 14 at the center x of the cover plate 10 and connecting each rib body 11 to the annular protrusion 14, one of the advantages of this design is that it can make the structural strength of the cover plate 10 along the circumferential direction z more uniform, thereby facilitating the reduction of stress concentration along the circumferential direction z of the cover plate 10.

[0053] Please refer to FIG. 2 and FIG. 4. The cover plate 10 provided by the embodiments of the present application has two sides away from each other in the thickness direction, and the rib body 11 and the annular protrusion 14 can be designed integrally, for example, the rib body 11 and the annular protrusion 14 can be obtained by stamping at least part of the cover plate 10 from one side of the cover plate 10 to the other side of the cover plate 10, or in another embodiment, the rib body 11 and the annular protrusion 14 can also be obtained by deep drawing. The forming method is simple and reliable, and can improve the structural strength of itself without adding materials. Of course, the rib body 11 and the annular protrusion 14 can also be designed separately.

[0054] Please refer to FIG. 5 and FIG. 6. FIG. 6 is a structural schematic diagram of the cover plate provided by an embodiment of the present application. In the process of implementing the embodiments of the present application, the inventors have found that if the rib body 11 is less, for example, there is only one rib body 11, then the cover plate 10 does not have good strength to resist the gravity extrusion of the battery roll core, and if the rib body 11 is more, the planar space of the cover plate 10 will be occupied by the rib body 11, resulting in that the strength of each rib body 11 is too small and there is not enough planar space for designing the score groove 12.

[0055] In the process of implementing the embodiments of the present application, the inventors have also found that if the groove depth of the score groove 12 is small, the cover plate 10 is not easy to break and release pressure within the preset internal pressure range of the battery, and if the groove depth of the score groove 12 is large, the cover plate 10 is easy to break before reaching the preset internal pressure of the battery.

[0056] After repeated calculations and experiments, the inventors have found that when the number of the rib body 11 is set to 2-10, the cover plate 10 can have better structural strength. For example, the number of the rib body 11 can be any value of 3, 4, 5, 6, 7, 8, 9, and any integer value within the range can be considered for selection.

[0057] After repeated calculations and experiments, the inventors have found that when the ratio of the groove depth of the score groove 12 to the thickness of the cover plate 10 is 50%-97%, the cover plate 10 can have better structural strength. For example, the ratio of the groove depth of the score groove 12 to the thickness of the cover plate 10 can be any value of 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, and any integer value within the range can be considered for selection.

[0058] In the specific implementation process, the designer can flexibly select the number of the rib body 11 and / or the ratio of the groove depth of the score groove 12 to the thickness of the cover plate 10 according to the internal pressure of the battery, the working conditions of the battery, and other situations.

[0059] It can be understood that the plurality of rib bodies 11 can be designed to be distributed at equal angular intervals along the circumference of the cover plate 10, and of course can not be designed to be distributed at equal angular intervals. The actual situation can be adjusted and set during specific design.

[0060] Referring to FIG. 7, FIG. 7 is a structural schematic diagram of a battery provided by the embodiments of the present application. The battery 100 provided by the embodiments of the present application can be a cylindrical battery, such as a cylindrical battery or a square battery, and of course can be any other suitable cylindrical battery. The battery 100 includes a shell 20, a winding core (not shown in the figure), and the cover plate 10 provided by the embodiments of the present application. The shell 20 is provided with a receiving chamber 21, the winding core 30 is arranged in the receiving chamber 21, and the cover plate 10 is arranged on the shell 20 to close the receiving chamber 21.

[0061] Please refer to FIG. 8, the rib body 11 and the score groove 12 provided by the embodiments of the present application can be arranged on the same side of the cover plate 10. When the cover plate 10 is assembled on the shell 20, the side of the cover plate 10 provided with the score groove 12 faces the winding core 30 and is arranged on the shell 20 to close the receiving chamber 21. In this way, at least part of the internal pressure of the battery 100 can be concentrated in the score groove 12. As the internal pressure of the battery 100 increases, the internal pressure of the battery 100 can cause the cover plate 10 to crack along the direction of the score groove 12, thereby playing a pressure relief protection role.

[0062] In summary, the cover plate and the battery provided by the embodiments of the present application have the following advantages: on the one hand, by arranging the score groove in the cover plate region between the two adjacent ribs, the cover plate can be torn along the score groove without reducing the strength of the ribs, which is conducive to the stable release of the internal pressure; on the other hand, by arranging the first score groove and the second score groove to be close to each other at one end and to be away from each other at the other end, the one end close to each other can be preferentially broken when the internal pressure of the battery is large, and the first score groove and the second score groove will be cracked in the direction of the edge of the cover plate under the continuous action of the internal pressure of the battery; finally, by arranging one or more of the third score groove, the fourth score groove and the fifth score groove to extend along the circumference of the cover plate, the stress can be better dispersed, the strength of the cover plate is improved, the score groove of the cover plate can be torn within the expected range of the internal pressure of the battery, and the functional failure of the cover plate caused by premature tearing is avoided.

Claims

1. A cover plate (10) applied to a battery (100), comprising: a plurality of ribs (11) extending outward from a center (x) of the cover plate along a radial direction (y) of the cover plate, the ribs (11) being distributed along a circumferential direction (z) of the cover plate; a plurality of score grooves (12) being arranged between two adjacent ribs (11), the score grooves (12) being arranged to be broken under the internal pressure of the battery (100).

2. The cover plate (10) according to claim 1, wherein At least one of the score grooves (12) comprises a first score groove (121) and a second score groove (122), the first score groove (121) and the second score groove (122) extending from the center of the cover plate (10) to the edge; and the distance between the first score groove (121) and the second score groove (122) gradually increases along the center (x) of the cover plate to the edge.

3. The cover plate (10) according to claim 2, wherein An end of the first score groove (121) close to the center of the cover plate (10) is connected to an end of the second score groove (122) close to the center of the cover plate (10). 4.The cover plate (10) of claim 2, wherein the score groove (12) further comprises a third score groove (123), one end of the third score groove (123) being connected to an end of the first score groove (121) close to the center (x) of the cover plate, and the other end of the third score groove (123) being connected to an end of the second score groove (122) close to the center (x) of the cover plate. 5.The cover plate (10) of claim 3 or 4, wherein the score groove (12) further comprises a fourth score groove (124), the fourth score groove (124) being connected to an end of the first score groove (121) away from the center (x) of the cover plate, the fourth score groove (124) extending towards the second score groove (122) ; and / or, the score groove (12) further comprises a fifth score groove (125), the fifth score groove (125) being connected to an end of the second score groove (122) away from the third score groove (123), the fifth score groove (125) extending towards the first score groove (121).

6. The cover plate (10) according to claim 5, wherein the third score groove (123) extends along the circumferential direction (z) of the cover plate; and / or, the fourth score groove (124) extends along the circumferential direction (z) of the cover plate; and / or, the fifth score groove (125) extends along the circumferential direction (z) of the cover plate. 7.The cover plate (10) of claim 5, wherein the cover plate (10) further comprises a ring-shaped protrusion (14) in the center of the cover plate (10), and each rib (11) has an end close to the center (x) of the cover plate connected to the ring-shaped protrusion (14).

8. The cover sheet (10) according to any one of claims 1 to 4, wherein The number of the ribs (11) is 2-10.

9. The cover sheet (10) according to any one of claims 1 to 4, wherein The ratio of the groove depth of the score groove (12) to the thickness of the cover plate (10) is 50%-97%.

10. A battery (100) comprising: a housing (20) provided with a receiving chamber (21); a roll core (30) disposed in the receiving chamber (21); and a cover plate (10) as claimed in any one of claims 1-9, the cover plate (10) being disposed on the housing (20) to close the receiving chamber (21).

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