Cover plate and battery

Abstract

The utility model provides a cover plate and a battery, the cover plate is applied to the battery, the cover plate is provided with a plurality of rib bodies, the plurality of rib bodies extend outwards from the center of the cover plate along the radial direction of the cover plate, and the plurality of rib bodies are distributed along the circumferential direction of the cover plate; the cover plate is also provided with a plurality of nick grooves, the nick grooves are formed between every two adjacent rib bodies, and the nick grooves are set to be broken when the internal pressure of the battery exceeds a preset value. The nick grooves are formed in the cover plate area between the two adjacent ribs, so that the cover plate can be torn along the nick grooves when the internal pressure of the battery exceeds the allowable strength value of the cover plate under the condition that the strength of the ribs is not reduced, and the stable release of the internal pressure is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a cover plate and battery. BACKGROUND

[0002] The battery is generally provided with a cover plate as a seal, and the cover plate in the related art is generally flat or is additionally provided with a reinforcing rib on the basis of the flat structure, in order to cope with the situation that the internal pressure of the battery continuously increases during use of the battery, the cover plate of some batteries is further provided with an opening valve structure, the opening valve 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, but the cover plate of some batteries in the related art has the opening valve structure arranged on the reinforcing rib, so that the strength of the cover plate is greatly reduced. SUMMARY

[0003] The embodiment of the utility model provides a cover plate and battery, can improve the technical problem of insufficient strength of cover plate in related art.

[0004] In a first aspect, the embodiment of the utility model provides a cover plate applied to a battery, comprising:

[0005] The cover plate is provided with a plurality of ribs, the plurality of ribs all extend 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.

[0006] The cover plate is further provided with a plurality of score grooves, the score grooves are arranged between the adjacent two ribs, and the score grooves are arranged to be broken under the action of the internal pressure of the battery.

[0007] In an embodiment, at least one score groove comprises a first score groove and a second score groove, the first score groove and the second score groove both extend from the center of the cover plate to the edge, and the distance between the first score groove and the second score groove gradually increases in the direction from the center of the cover plate to the edge.

[0008] In an embodiment, one end of the first score groove close to the center of the cover plate is connected to one end of the second score groove close to the center of the cover plate.

[0009] In an embodiment, the score groove further comprises a third score groove, one end of the third score groove is connected to one end of the first score groove close to the center of the cover plate, and the other end of the third score groove is connected to one end of the second score groove close to the center of the cover plate.

[0010] In an embodiment, the score groove further comprises a fourth score groove connected to an end of the first score groove away from the center of the cover plate, the fourth score groove extending in a direction towards the second score groove; and / or, the score groove further comprises a fifth score groove connected to an end of the second score groove away from the third score groove, the fifth score groove extending in a direction towards the first score groove.

[0011] In an embodiment, the third score groove extends along the circumference of the cover plate; and / or, the fourth score groove extends along the circumference of the cover plate; and / or, the fifth score groove extends along the circumference of the cover plate.

[0012] In an embodiment, the cover plate further comprises a ring-shaped protrusion at the center of the cover plate, each of the rib bodies being connected to the ring-shaped protrusion at an end close to the center of the cover plate.

[0013] In an embodiment, the number of the rib bodies is 2-10.

[0014] In an embodiment, the ratio of the depth of the score groove to the thickness of the cover plate is 50%-97%.

[0015] In a first aspect, the embodiments of the utility model further provide a battery, comprising:

[0016] A shell, the shell is equipped with receiving chamber;

[0017] A roll core, the roll core is arranged in the receiving chamber; and,

[0018] The cover plate as described in the embodiments of the application is arranged on the shell to close the receiving chamber.

[0019] The embodiments of the utility model have the beneficial effects that: a plurality of radially extending rib bodies are arranged on the cover plate in the radial direction, and the plurality of rib bodies are distributed along the circumference of the cover plate, so that the structural strength of the cover plate in the radial direction and the circumferential direction is effectively improved; score grooves are arranged in the regions of the cover plate between adjacent two rib bodies, and the plurality of score grooves are distributed along the circumference of the cover plate, the thickness of the cover plate at the positions corresponding to the score grooves is smaller than the thickness of other positions of the cover plate, so that the cover plate can be torn along the score grooves when the internal pressure of the battery exceeds the allowable strength value of the cover plate without reducing the strength of the rib body, which is beneficial to the stable release of the internal pressure. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 is a structural schematic view of one side of the cover plate provided by an embodiment of the present application;

[0022] Figure 2 is a structural schematic view of the other side of the cover plate provided by an embodiment of the present application;

[0023] Figure 3 is a front projection structural schematic view of one side of the cover plate provided by an embodiment of the present application;

[0024] Figure 4 is Figure 3 is a sectional view of the cover plate obtained by cutting along the A-A direction in the above-mentioned cover plate;

[0025] Figure 5 is Figure 4 is an enlarged schematic view of the B part in the above-mentioned cover plate;

[0026] Figure 6 is a structural schematic view of the cover plate provided by an embodiment of the present application;

[0027] Figure 7 is a structural schematic view of the battery provided by an embodiment of the present application.

[0028] Explanation of reference signs:

[0029] 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 body; 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. DETAILED DESCRIPTION

[0030] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is merely used for illustrating and explaining the present application, and is not used for limiting the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing in the drawing; and "inner" and "outer" refer to the contour of the device.

[0031] The battery is generally provided with a cover plate as a seal, and the cover plate in the related art is generally a flat plate type or is additionally provided with a reinforcing rib on the basis of the structure of the flat plate type. In order to cope with the situation that the internal pressure of the battery continues to increase during use of the battery, the cover plate of some batteries is also provided with an opening valve structure. The opening valve 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. However, the cover plate of some batteries in the related art has the opening valve structure arranged on the reinforcing rib, so that the strength of the cover plate is greatly reduced.

[0032] Please refer to Figure 1 and Figure 2 , Figure 1 the structure schematic view of one side of the cover plate provided by the embodiment of the present application, Figure 2 the structure schematic view of the other side of the cover plate provided by the embodiment of the present application.

[0033] 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 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, and one of the advantages of the 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, and thus the design can make the cover plate 10 tear 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 beneficial to the stable release of the internal pressure of the battery.

[0034] Please refer to Figure 1 , the cover plate 10 can comprise a cover body 13, the rib body 11 is connected to the cover body 13, and 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, which can be understood as 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.

[0035] 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 that the two side walls 111 are perpendicular to the cover body 13 in the related art, the rib body 11 designed in this way has better structural strength. Please continue to refer to Figure 1 The rib body 11 can also 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 between the two side walls 111 to improve the strength of the rib body 11.

[0036] In some embodiments, the top wall 113 can be curvedly connected with the two side walls 111 to improve the strength of the rib body 11.

[0037] 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.

[0038] 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, i.e., the rib body 11 and the cover plate 10 are in an integral structure, and the rib body 11 can be formed by stamping at least part of the cover plate 10.

[0039] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 , Figure 3 a front projection structure diagram of one side of the cover plate provided in the embodiments of the present application, Figure 4 a sectional view diagram of the cover plate along the direction A-A in Figure 3 , Figure 5 an enlarged diagram of the B part in Figure 4 .

[0040] 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 a 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.

[0041] Please continue to refer to Figure 1In some embodiments, the at least one score groove 12 includes a first score groove 121 and a second score groove 122, both of which extend from the edge of the cover plate 10 towards the center x of the cover plate 10 and gradually decrease in spacing between the first score groove 121 and the second score groove 122 as they approach the center x of the cover plate 10. One advantage of this design is that the stress is concentrated at the end of the first score groove 121 and the second score groove 122 that is closer to the center x of the cover plate 10, and when the internal pressure of the battery is high, the end closer to the center x of the cover plate 10 will break first, and under the continued action of the internal pressure of the battery, the first score groove 121 and the second score groove 122 will crack in the direction of the edge of the cover plate 10.

[0042] As an optional embodiment, the end of the first score groove 121 closer to the center x of the cover plate 10 can be connected to the end of the second score groove 122 closer to the center x of the cover plate 10, and when the internal pressure of the battery is high, the connection between the first score groove 121 and the second score groove 122 will break first to form a crack, through which the internal pressure of the battery is released, and when the internal pressure of the battery is too high, the crack will expand along the first score groove 121 and the second score groove 122 in the direction of the edge of the cover plate 10, and at the same time, the part of the cover plate 10 between the first score groove 121 and the second score groove 122 will bend and deform in the direction away from the battery, eventually forming a through hole that connects the internal cavity of the battery.

[0043] As another optional embodiment, to reduce stress concentration and improve the internal pressure resistance of the cover plate 10, the score groove 12 can also include a third score groove 123, one end of the third score groove 123 being connected to the end of the first score groove 121 closer to the center x of the cover body 13, and the other end of the third score groove 123 being connected to the end of the second score groove 122 closer to the center x of the cover body 13. With this design, the two ends of the third score groove 123 become stress concentration points, and when the internal pressure of the battery exceeds the allowable value of the cover plate 10, the two ends of the third score groove 123 will break first, and under the continued action of the internal pressure of the battery, at one end of the third score groove 123, a crack will expand along the second score groove 122 and the third score groove 123, and at the same time, at the other end of the third score groove 123, another crack will expand along the first score groove 121 and the third score groove 123, thereby forming a through hole between the first score groove 121 and the second score groove 122 that can communicate with the internal cavity of the battery to release the internal pressure of the battery.

[0044] As a further optional 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, the fourth score groove 124 extending in a direction towards the second score groove 122, so as to enable the portion of the cover plate 10 between the first score groove 121 and the second score groove 122 to bend outwards of the battery chamber to form a larger opening.

[0045] In some embodiments, 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, the fifth score groove 125 extending in a direction towards the first score groove 121, so as to enable the portion of the cover plate 10 between the first score groove 121 and the second score groove 122 to bend outwards of the battery chamber to form a larger opening.

[0046] For example, the score groove 12 can comprise the fourth score groove 124 and not the fifth score groove 125, the fourth score groove 124 connected to an end of the first score groove 121 away from the center x of the cover plate 10, the fourth score groove 124 extending in a direction towards the second score groove 122.

[0047] In another embodiment, the score groove 12 can comprise the fifth score groove 125 and not the fourth score groove 124, the fifth score groove 125 connected to an end of the second score groove 122 away from the third score groove 123, the fifth score groove 125 extending in a direction towards the first score groove 121.

[0048] In a further embodiment, the score groove 12 can comprise both the fourth score groove 124 and the fifth score groove 125, the fourth score groove 124 connected to an end of the first score groove 121 away from the center x of the cover plate 10, the fourth score groove 124 extending in a direction towards the second score groove 122, the fifth score groove 125 connected to an end of the second score groove 122 away from the third score groove 123, the fifth score groove 125 extending in a direction towards the first score groove 121.

[0049] An advantage of the above design is that it enables the portion of the cover plate 10 between the first score groove 121 and the second score groove 122 to more easily bend in a direction away from the battery, thereby forming a larger opening between the first score groove 121 and the second score groove 122 that is in communication with the battery chamber and that can release the pressure inside the battery.

[0050] 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 enable the score groove 12 of the cover plate 10 to be torn within a desired range of pressure inside the battery, thereby avoiding functional failure of the cover plate 10 due to premature tearing.

[0051] In some embodiments, the fourth score groove 124 can be arranged along the circumferential direction z of the cover plate 10, which can better disperse stress and improve the strength of the cover plate 10, so that the score groove 12 of the cover plate 10 can 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] In some embodiments, the fifth score groove 125 can be arranged along the circumferential direction z of the cover plate 10, which can better disperse stress and improve the strength of the cover plate 10, so that the score groove 12 of the cover plate 10 can be torn within the desired internal pressure range of the battery, avoiding the functional failure of the cover plate 10 due to premature tearing.

[0053] 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 specific implementation process, corresponding design or adjustment can be made according to actual needs or actual working conditions.

[0054] Some embodiments of the present application can better disperse stress and improve the strength of the cover plate 10 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, so that the score groove 12 of the cover plate 10 can be torn within the desired internal pressure range of the battery, avoiding the functional failure of the cover plate 10 due to premature tearing.

[0055] Please continue to refer to Figure 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 the structural strength of the cover plate 10 in the circumferential direction z can be more uniform, thereby facilitating the reduction of stress concentration in the circumferential direction z of the cover plate 10.

[0056] Please refer to Figure 2 and Figure 4The cover plate 10 provided by the embodiment of the present application has two sides away from each other in the thickness direction, 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 forming 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, in another embodiment, the rib body 11 and the annular protrusion 14 can also be obtained by drawing, the forming mode is simple and reliable, and the structural strength of the cover plate 10 can be improved without adding materials. Of course, the rib body 11 and the annular protrusion 14 can also be designed separately.

[0057] Please refer to Figure 5 and Figure 6 , Figure 6 The structural schematic diagram of the cover plate provided by the embodiment of the present application is shown in the figure. In the process of implementing the embodiment of the present application, the inventor finds that if the number of the rib body 11 is small, for example, the rib body 11 is only one, the cover plate 10 cannot have good strength to resist the extrusion of the gravity of the battery roll core, and if the number of the rib body 11 is large, the planar space of the surface of the cover plate 10 will be occupied by the rib body 11, so that the strength of each rib body 11 is too small, and there is not enough planar space for designing the score groove 12.

[0058] In the process of implementing the embodiment of the present application, the inventor also finds 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.

[0059] After repeated calculation and repeated tests, the inventor finds that when the number of the rib body 11 is set to 2-10, the cover plate 10 can have good structural strength. For example, the number of the rib body 11 can be any value of 3, 4, 5, 6, 7, 8, 9, and as long as the integer value in the range is selected, it can be considered to be applicable.

[0060] After repeated calculation and repeated tests, the inventor finds 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 good 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 as long as the integer value in the range is selected, it can be considered to be applicable.

[0061] 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 condition of the battery and the like.

[0062] It can be understood that the plurality of ribs 11 can be designed to be equiangularly distributed along the circumference of the cover plate 10, and of course can not be designed to be equiangularly distributed, and the specific design can be adjusted and set according to the actual situation.

[0063] Please refer to Figure 7 , Figure 7 A structural schematic diagram of a battery is provided for the embodiments of the present application. The battery 100 provided by the embodiments of the present application can be a cylindrical battery, for example, a cylindrical battery or a square battery, and of course can also be any other suitable cylindrical battery. The battery 100 comprises 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, the winding core is arranged in the receiving chamber, and the cover plate 10 is arranged on the shell 20 to close the receiving chamber.

[0064] The cover plate 10 provided by the embodiments of the present application, the ribs 11 and the score groove 12 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 and is arranged on the shell 20 to close the receiving chamber. 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.

[0065] In summary, the beneficial effects of the cover plate and the battery provided by the embodiments of the present application are as follows. 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 end close to each other can be preferentially broken when the internal pressure of the battery is large, and under the continuous action of the internal pressure of the battery, the first score groove and the second score groove will crack in the direction of the edge of the cover plate. 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 internal pressure range of the battery, and the functional failure of the cover plate caused by premature tearing is avoided.

[0066] The embodiments of the present application are described in detail above, and specific examples are applied in this paper to describe the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A cover plate for use in a battery, characterized by The cover plate is provided with a plurality of ribs, each of the ribs extending radially outward from the center of the cover plate, and the ribs are distributed circumferentially along the cover plate. The cover plate is further provided with a plurality of score grooves, each of the score grooves being arranged between two adjacent ribs, and the score grooves are arranged to be broken under the internal pressure of the battery. At least one of the score grooves comprises a first score groove and a second score groove, each of the first score groove and the second score groove extending from the center of the cover plate towards the edge; and the distance between the first score groove and the second score groove gradually increases in the direction from the center of the cover plate towards the edge.

2. The cover sheet of claim 1, wherein The end of the first score groove close to the center of the cover plate is connected to the end of the second score groove close to the center of the cover plate.

3. The cover sheet of claim 2, wherein, The score grooves further comprise a third score groove, one end of the third score groove being connected to the end of the first score groove close to the center of the cover plate, and the other end of the third score groove being connected to the end of the second score groove close to the center of the cover plate.

4. The cover sheet of claim 2, wherein, The score grooves further comprise a fourth score groove, the fourth score groove being connected to the end of the first score groove away from the center of the cover plate, and the fourth score groove extending towards the second score groove; and / or, 5. The cover plate according to claim 3 or 4, characterized in that The score grooves further comprise a third score groove, one end of the third score groove being connected to the end of the first score groove close to the center of the cover plate, and the other end of the third score groove being connected to the end of the second score groove close to the center of the cover plate, the score grooves further comprise a fifth score groove, the fifth score groove being connected to the end of the second score groove away from the third score groove, and the fifth score groove extending towards the first score groove. The third score groove extends circumferentially along the cover plate; and / or, 6. The cover sheet of claim 5, wherein, The fourth score groove extends circumferentially along the cover plate; and / or, The fifth score groove extends circumferentially along the cover plate. The cover plate is further provided with an annular protrusion at the center of the cover plate, and each of the ribs is connected to the annular protrusion at the end close to the center of the cover plate.

7. The cover sheet of claim 5, wherein The number of the ribs is 2-10.

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

9. The cover sheet according to any one of claims 1-4, wherein, The shell is provided with a receiving chamber; 10. A battery, characterized by The roll core is arranged in the receiving chamber; and The cover plate according to any one of claims 1-9 is arranged on the shell to close the receiving chamber. ​ ​ ​

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