Collecting plate, battery, battery pack and electric equipment

Abstract

The invention discloses a current collecting plate, a battery, a battery pack and electric equipment. The current collecting plate comprises a base part, a first convex part and a second convex part, the first protruding part is arranged in the center area of the base part and extends in the thickness direction of the base part. The second protruding part is arranged on the base part, and the extending direction of the second protruding part is the same as or opposite to the extending direction of the first protruding part. According to the collector plate, the first convex part arranged in the central area of the base part is convenient for welding and connecting the shell, and the second convex part is additionally arranged, so that the surface of the base part forms an irregular shape, and when a plurality of collector plates are stacked, the risk of mutual nesting among different collector plates can be reduced; and the influence of nesting of the current collecting plates on the quality and the energy density of the battery is reduced.

Description

Current collector plate, battery, battery pack and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a current collector plate, a battery, a battery pack and an electric device. BACKGROUND

[0002] At present, in order to improve the output power of the traditional cylindrical battery, a sheet-shaped current collector plate is usually welded to the electrode assembly and the shell. At the same time, in order to ensure the fit of the current collector plate and the shell, a boss is arranged at the center of the current collector plate to improve the welding reliability.

[0003] SUMMARY

[0004] The inventor found that when multiple current collector plates are stacked, they are prone to mutual nesting, and the nested current collector plates are prone to vacuum adsorption, which causes the device to easily pick up the current collector plate, thereby causing quality risks and space utilization losses of the battery.

[0005] In view of the above situation, it is necessary to provide a current collector plate to improve the mutual nesting problem of the current collector plate when stacked.

[0006] Embodiments of the present application provide a current collector plate, which comprises a base, a first protruding portion and a second protruding portion. The first protruding portion is arranged at the center region of the base and extends along the thickness direction of the base. The second protruding portion is arranged on the base and extends along the thickness direction of the base, and the extending direction of the second protruding portion is the same as or opposite to that of the first protruding portion.

[0007] The first protruding portion at the center region of the base of the current collector plate is used for welding connection with the shell, and the second protruding portion is additionally arranged to form an irregular shape on the surface of the base. When multiple current collector plates are stacked, this is conducive to reducing the risk of mutual nesting between different current collector plates, thereby reducing the influence of the nesting of the current collector plates on the quality and energy density of the battery.

[0008] In one or more embodiments of the present application, the extending direction of the first protruding portion is the same as that of the second protruding portion, the first protruding portion and the second protruding portion are connected to each other to form a third protruding portion, and the projection of the third protruding portion on a projection plane perpendicular to the thickness direction of the base is not circular. By connecting the first protruding portion and the second protruding portion to each other to form a non-circular third protruding portion, when multiple current collector plates are stacked, this is conducive to reducing the risk of mutual nesting between different current collector plates, thereby reducing the influence of the nesting of the current collector plates on the quality and energy density of the battery.

[0009] In one or more embodiments of the present application, the shape of the projection of the first protrusion on a projection plane perpendicular to the thickness direction of the base is circular; the second protrusion is arranged on the circumference of the first protrusion. By arranging the second protrusion on the circumference of the first protrusion, the third protrusion is formed into a non-circular special-shaped structure, which is conducive to reducing the risk of mutual nesting between different current collectors when a plurality of current collectors are stacked, thereby reducing the influence of current collector nesting on battery quality and energy density.

[0010] In one or more embodiments of the present application, the current collector includes n second protrusions, n≥2; the included angle between the line connecting the centers of any two adjacent second protrusions and the center of the first protrusion is α, α≤180°.

[0011] In one or more embodiments of the present application, n≥3, and any two included angles are not equal. By arranging any two clamps to be unequal, it is conducive to reducing the risk of mutual nesting between different current collectors when a plurality of current collectors are stacked, thereby reducing the influence of current collector nesting on battery quality and energy density.

[0012] In one or more embodiments of the present application, n≥3; among the n included angles, the largest included angle is α max , and the smallest included angle is α min , α max -α min ≥5°.

[0013] In one or more embodiments of the present application, the diameter of the base is d1, and the diameter of the circumscribed circle of the third protrusion is d2, 10%≤d2 / d1≤70%, which is conducive to balancing the welding strength between the first protrusion and the shell and the welding strength between the base and the electrode assembly.

[0014] In one or more embodiments of the present application, the diameter of the base and the diameter d2 of the circumscribed circle of the third protrusion satisfy 20%≤d2 / d1≤40%, which is conducive to further balancing the welding strength between the first protrusion and the shell and the welding strength between the base and the electrode assembly.

[0015] In one or more embodiments of the present application, the diameter of the circumscribed circle of the third protrusion is d2, and the diameter of the first protrusion is d3, 103%≤d2 / d3≤200%, which is conducive to balancing the welding strength between the first protrusion and the shell and reducing the influence of the second protrusion on the welding strength between the base and the electrode assembly.

[0016] In one or more embodiments of the present application, the diameter d3 of the first protrusion and the diameter of the circumscribed circle of the third protrusion 34 satisfy 110%≤d2 / d3≤150%, which is conducive to further balancing the welding strength between the first protrusion and the shell and reducing the influence of the second protrusion on the welding strength between the base and the electrode assembly.

[0017] In one or more embodiments of the present application, the shape of the projection of the third protrusion on the projection plane perpendicular to the thickness direction of the base is any one of an ellipse, a triangle, or a quadrilateral.

[0018] In one or more embodiments of the present application, the projection of the first protrusion and the projection of the second protrusion are separated on the projection plane perpendicular to the thickness direction of the base.

[0019] In one or more embodiments of the present application, the projection of the second protrusion is located within the projection of the first protrusion on the projection plane perpendicular to the thickness direction of the base.

[0020] Embodiments of the present application also provide a battery comprising the current collector plate of any one of the preceding embodiments.

[0021] In the battery described above, by additionally providing the second protrusion on the current collector plate, the surface of the base of the current collector plate forms an irregular shape, which is conducive to reducing the risk of mutual nesting between different current collector plates when multiple current collector plates are stacked during the preparation of the battery, thereby reducing the impact of the nesting of the current collector plates on the quality and energy density of the battery.

[0022] Embodiments of the present application also provide a battery pack comprising the battery described above.

[0023] In the battery pack described above, by additionally providing the second protrusion on the current collector plate of the battery, the surface of the base of the current collector plate forms an irregular shape, which is conducive to reducing the risk of mutual nesting between different current collector plates when multiple current collector plates are stacked during the preparation of the battery, thereby reducing the impact of the nesting of the current collector plates on the quality and energy density of the battery, and reducing the impact of the quality and energy density of the battery on the battery pack.

[0024] Embodiments of the present application also provide an electrical device comprising the battery described above or the battery pack described above.

[0025] In the electrical device described above, by additionally providing the second protrusion on the current collector plate of the battery, the surface of the base of the current collector plate forms an irregular shape, which is conducive to reducing the risk of mutual nesting between different current collector plates when multiple current collector plates are stacked during the preparation of the battery, thereby reducing the impact of the nesting of the current collector plates on the quality and energy density of the battery, and reducing the impact of the quality and energy density of the battery on the electrical device. BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 is a view of a current collector plate along the thickness direction of the base in one embodiment of the present application.

[0027] FIG. 2 is a view of a current collector plate perpendicular to the thickness direction of the base in one embodiment of the present application.

[0028] FIG. 3 is a structural diagram of a battery in one embodiment of the present application.

[0029] FIG. 4 is a cross-sectional view of a battery in one embodiment of the present application.

[0030] FIG. 5 is a view of a current collector plate in the direction of the thickness of a base in one embodiment of the present application.

[0031] FIG. 6 is a view of a current collector plate in the direction of the thickness of a base in one embodiment of the present application.

[0032] FIG. 7 is a view of a current collector plate in the direction of the thickness of a base in one embodiment of the present application.

[0033] FIG. 8 is a view of a current collector plate in the direction of the thickness of a base in one embodiment of the present application.

[0034] FIG. 9 is a view of a current collector plate in the direction of the thickness of a base in one embodiment of the present application.

[0035] FIG. 10 is a cross-sectional view of a current collector plate in the direction perpendicular to the thickness of a base in one embodiment of the present application.

[0036] FIG. 11 is a cross-sectional view of a current collector plate in the direction perpendicular to the thickness of a base in one embodiment of the present application.

[0037] FIG. 12 is a view of a current collector plate in the direction of the thickness of a base in one embodiment of the present application.

[0038] FIG. 13 is a cross-sectional view of a current collector plate in the direction perpendicular to the thickness of a base in one embodiment of the present application.

[0039] FIG. 14 is a structural diagram of a battery pack in one embodiment of the present application.

[0040] FIG. 15 is a structural diagram of an electric device in one embodiment of the present application.

[0041] Main element symbol explanation collector plate 30 base 31 first surface 311 second surface 312 first protrusion 32 second protrusion 33 third protrusion 34 battery 100 housing 10 bottom wall 11 electrode assembly 20 battery pack 200 electric device 300

[0042] The following detailed description will further describe the present application with reference to the above mentioned figures. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0044] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an element disposed in the middle. When an element is considered to be "disposed on" another element, it can be directly disposed on the other element or there can be an element disposed in the middle.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0047] In the description of the embodiments of the present application, the term "vertical" is used to describe the ideal state between two components. In the actual production or use state, there can be an approximate vertical state between the two components. For example, in combination with numerical description, vertical can refer to the included angle between two straight lines in the range of 90±10°, vertical can also refer to the dihedral angle between two planes in the range of 90°±10°, and vertical can also refer to the included angle between a straight line and a plane in the range of 90±10°. The two components described as "vertical" can not be absolute straight lines or planes, but can be approximately straight lines or planes, and as a whole, the overall extension direction is a straight line or a plane, which can be considered as a "straight line" or a "plane".

[0048] Reference to "embodiments" herein means that the specific features, structures, or characteristics described in combination with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor are they necessarily mutually exclusive or alternative embodiments to each other. In the case of no conflict, each embodiment in the present application can be combined with each other.

[0049] It should be noted that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0050] The inventors found that during the preparation of cylindrical batteries, the multiple current collecting plates are prone to nesting with each other, and the nested current collecting plates have a phenomenon of vacuum adsorption, which causes the device to easily pick up multiple current collecting plates when grabbing the current collecting plates, thereby causing the battery to have a quality risk and a risk of loss of space utilization.

[0051] Embodiments of the present application provide a current collecting plate, which includes a base, a first protruding portion and a second protruding portion. The first protruding portion is arranged at the center region of the base and extends along the thickness direction of the base. The second protruding portion is arranged at the base and extends along the thickness direction of the base, and the extending direction of the second protruding portion is the same as or opposite to that of the first protruding portion.

[0052] The first protrusion of the base center area of the current collector plate is used for welding connection with the shell. By additionally arranging the second protrusion, the surface of the base is formed into an irregular shape, which is beneficial to reduce the risk of mutual nesting between different current collector plates when a plurality of current collector plates are stacked, and further reduce the influence of the nesting of the current collector plates on the quality and energy density of the battery.

[0053] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0054] As shown in FIGS. 1-4, the embodiments of the present application provide a current collector plate 30, which includes a base 31 and a first protrusion 32 arranged at a center area of the base 31 and extending along the thickness direction of the base 31. The upward or downward direction along the thickness of the base 31 can be understood as the thickness direction of the base 31.

[0055] When the current collector plate 30 is assembled in the battery 100, the current collector plate 30 is located between the electrode assembly 20 and the bottom wall 11 of the shell 10, and the current collector plate 30 connects the electrode assembly 20 and the bottom wall 11. The first protrusion 32 extends towards the bottom wall 11 and is welded to the bottom wall 11. By arranging the first protrusion 32 on the current collector plate 30, the current collector plate 30 is facilitated to be welded to the bottom wall 11.

[0056] In an embodiment, the projection of the first protrusion 32 on a projection plane perpendicular to the thickness direction of the base 31 is circular in shape, which is beneficial to the processing and manufacturing of the current collector plate 30, reduces the risk of damage of the current collector plate 30 due to stress concentration, and improves the structural strength of the current collector plate 30.

[0057] In an embodiment, the current collector plate 30 further includes a second protrusion 33 arranged on the base 31 and extending along the thickness direction of the base 31, and the extending direction of the second protrusion 33 is the same as or opposite to that of the first protrusion 32. By arranging the second protrusion 33 on the base 31, the surface of the base 31 along the thickness direction is formed into an irregular shape. When a plurality of current collector plates 30 are stacked, in two adjacent current collector plates 30, the second protrusion 33 of one current collector plate 30 is connected to the base 31 of the other current collector plate 30, so that the first protrusions 32 of the two current collector plates 30 are separated or partially in contact, which is beneficial to reduce the risk of mutual nesting between different current collector plates 30, and further reduce the influence of the nesting of the current collector plates 30 on the quality and energy density of the battery 100.

[0058] In an embodiment, the base 31 has a first surface 311 and a second surface 312 facing away from each other, and the first protrusion 32 is arranged on the first surface 311. When the current collector plate 30 is assembled in the battery 100, the first surface 311 faces the bottom wall 11, and the second surface 312 faces the electrode assembly 20.

[0059] In an embodiment, the second protrusion 33 protrudes from the first surface 311, and the extending direction of the second protrusion 33 is the same as the extending direction of the first protrusion 32, facilitating the processing and manufacturing of the current collector plate 30 and improving the processing efficiency of the current collector plate 30. In addition, when the current collector plate 30 is assembled in the battery 100, the extending directions of the first protrusion 32 and the second protrusion 33 are the same, and both extend toward the bottom wall 11. Compared with the second protrusion 33 protruding from the first surface 311 and extending toward the electrode assembly 20, the second surface 312 of the current collector plate 30 in the embodiment is relatively flat, which is conducive to reducing the influence of the current collector plate 30 on the electrode assembly 20.

[0060] In an embodiment, the first protrusion 32 and the second protrusion 33 are connected with each other to form a third protrusion 34, and the projection of the third protrusion 34 on a projection plane perpendicular to the thickness direction of the base 31 is not circular. By connecting the first protrusion 32 and the second protrusion 33 with each other to form the third protrusion 34 in a non-circular shape, in the stacking of multiple current collector plates 30, the second protrusion 33 on one of the two adjacent current collector plates 30 is connected with the second surface 312 of the base 31 of the other current collector plate 30, so that the first protrusions 32 of the two current collector plates 30 are separated or partially in surface contact, which is conducive to reducing the risk of mutual nesting between different current collector plates 30, and further reducing the influence of the nesting of the current collector plates 30 on the quality and energy density of the battery 100.

[0061] In an embodiment, the second protrusion 33 is arranged on the circumference of the first protrusion 32, so that the third protrusion 34 is formed in a non-circular special-shaped structure, which is conducive to reducing the risk of mutual nesting between different current collector plates 30 in the stacking of multiple current collector plates 30, and further reducing the influence of the nesting of the current collector plates 30 on the quality and energy density of the battery 100.

[0062] As shown in FIGS. 5 and 6, in an embodiment, the projection of the third protrusion 34 on a projection plane perpendicular to the thickness direction of the base 31 is in any one of an elliptical shape, a triangular shape, or a quadrilateral shape.

[0063] In an embodiment, the current collector plate 30 includes n second protrusions 33, and n = 1.

[0064] As shown in FIGS. 4, 7, and 8, in an embodiment, the number n of the second protrusions 33 satisfies n ≥ 2.

[0065] In an embodiment, the included angle between the line connecting the centers of any two adjacent second protrusions 33 and the center of the first protrusion 32 is α, and α ≤ 180°.

[0066] In an embodiment, the number n of the second protrusions 33 is 2, and the included angle a is 180°, facilitating the manufacturing of the current collecting plate 30, improving the manufacturing efficiency of the current collecting plate 30, and also being conducive to improving the stability of mutual support between adjacent current collecting plates 30, reducing the risk of overturning of the stacked current collecting plates 30, and improving the preparation efficiency and quality of the battery 100.

[0067] In an embodiment, the number n of the second protrusions 33 satisfies n≥3 and a<180°. By designing the number of the second protrusions 33 as n≥3, the number of the second protrusions 33 is increased. When a plurality of current collecting plates 30 are stacked, among the two adjacent current collecting plates 30, the number of the mutual connection fulcrums (i.e., the second protrusions 33) is increased, which is not only conducive to reducing the risk of mutual nesting between different current collecting plates 30, but also conducive to improving the stability of mutual support between adjacent current collecting plates 30, reducing the risk of overturning of the stacked current collecting plates 30, and improving the preparation efficiency and quality of the battery 100.

[0068] As an exemplary example, a can be one of 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150°, or 165°.

[0069] As an exemplary example, n can be one of 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12.

[0070] In an embodiment, the number n of the second protrusions 33 satisfies n≥3, and any two included angles a are not equal. By setting any two included angles a to be unequal, when a plurality of current collecting plates 30 are stacked, it is conducive to reducing the risk of mutual nesting between different current collecting plates 30, and further reducing the influence of the nesting of the current collecting plates 30 on the quality and energy density of the battery 100.

[0071] In an embodiment, the number n of the second protrusions 33 satisfies n≥3, the maximum included angle among the n included angles a is a max , and the minimum included angle is a min , and a max -a min ≥5°. When a plurality of current collecting plates 30 are stacked, it is conducive to reducing the risk of mutual nesting between different current collecting plates 30, further reducing the influence of the nesting of the current collecting plates 30 on the quality and energy density of the battery 100, improving the stability of mutual support between adjacent current collecting plates 30, and reducing the risk of overturning of the stacked current collecting plates 30.

[0072] In an embodiment, the number n of the second protrusions 33 is 3, and the sizes of the three included angles are 90°, 120°, and 150°, respectively, facilitating the manufacturing of the current collecting plate 30, improving the manufacturing efficiency of the current collecting plate 30, and also being conducive to reducing the risk of mutual nesting between different current collecting plates 30.

[0073] As an example, the number n of the second protrusions 33 is taken as 3 for further illustration.

[0074] In an embodiment, the diameter of the base 31 is d1, the diameter of the circumscribed circle of the third protrusion 34 is d2, and 10%≤d2 / d1≤70%, which is beneficial to balance the welding strength between the first protrusion 32 and the shell 10 and the welding strength between the base 31 and the electrode assembly 20.

[0075] The circumscribed circle of the third protrusion 34 refers to a circle with the center of the first protrusion 32 as the center and the distance between the farthest point on the third protrusion 34 from the center and the center as the radius.

[0076] In an embodiment, the diameter d1 of the base 31 and the diameter d2 of the circumscribed circle of the third protrusion 34 satisfy 20%≤d2 / d1≤40%, which is beneficial to further balance the welding strength between the first protrusion 32 and the shell 10 and the welding strength between the base 31 and the electrode assembly 20.

[0077] As an example, d2 / d1 can be one of 20%, 25%, 30%, 35%, or 40%.

[0078] In an embodiment, the diameter of the first protrusion 32 is d3, and the diameter d3 of the first protrusion 32 and the diameter d2 of the circumscribed circle of the third protrusion 34 satisfy 103%≤d2 / d3≤200%, which is beneficial to balance the welding strength between the first protrusion 32 and the shell 10 and reduce the impact of the second protrusion 33 on the welding strength between the base 31 and the electrode assembly 20.

[0079] In an embodiment, the diameter d3 of the first protrusion 32 and the diameter d2 of the circumscribed circle of the third protrusion 34 satisfy 110%≤d2 / d3≤150%, which is beneficial to further balance the welding strength between the first protrusion 32 and the shell 10 and reduce the impact of the second protrusion 33 on the welding strength between the base 31 and the electrode assembly 20.

[0080] As an example, d2 / d3 can be one of 110%, 120%, 130%, 140%, or 150%.

[0081] In an embodiment, the diameter d2 of the circumscribed circle of the third protrusion 34 satisfies 10mm≤d2≤35mm.

[0082] In an embodiment, the height of the first protrusion 32 protruding from the first surface 311 is equal to the height of the second protrusion 33 protruding from the first surface 311, which is convenient for processing and manufacturing the current collector plate 30 and improves the processing and manufacturing efficiency of the current collector plate 30.

[0083] As an exemplary example, d2 can be one of 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, or 35 mm.

[0084] In an embodiment, the first protrusion 32 protrudes from the first surface 311 by a height h1, 0.02 mm≤h1≤2 mm.

[0085] As an exemplary example, h1 can be one of 0.02 mm, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm.

[0086] In an embodiment, the second protrusion 33 protrudes from the first surface 311 by a height h2, 0.02 mm≤h2≤2 mm.

[0087] As an exemplary example, h2 can be one of 0.02 mm, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm.

[0088] In an embodiment, the height h1 at which the first protrusion 32 protrudes from the first surface 311 and the height h2 at which the second protrusion 33 protrudes from the first surface 311 satisfy h1=h2=0.1 mm, facilitating the manufacture of the current collector plate 30 and improving the manufacturing efficiency of the current collector plate 30.

[0089] In an embodiment, the second protrusion 33 is a fan-shaped structure with a certain point on the first protrusion 32 as the center, facilitating the manufacture of the current collector plate 30 and improving the manufacturing efficiency of the current collector plate 30.

[0090] In an embodiment, the radius of the second protrusion 33 is r, and 0.2mm≤r≤5mm. When multiple current collectors 30 are stacked, the radius r of the second protrusion 33 is in the range, which is conducive to improving the stability of mutual support between adjacent current collectors 30, and reducing the risk of overturning of the stacked current collectors 30. In addition, the radius r of the second protrusion 33 is in the range, which is also conducive to reducing the influence of the second protrusion 33 on the welding strength between the base 31 and the electrode assembly 20.

[0091] As shown in FIGS. 9-11, in an embodiment, the projection of the first protrusion 32 and the projection of the second protrusion 33 are separated on the projection plane perpendicular to the thickness direction of the base 31.

[0092] In an embodiment, the second protrusion 33 is protruded on the first surface 311 and separated from the first protrusion 32 (as shown in FIG. 10). When multiple current collectors 30 are stacked, among two adjacent current collectors 30, the second protrusion 33 on one current collector 30 connects the second surface 312 of the base 31 of the other current collector 30, the second protrusion 33 as a fulcrum is separated from the first protrusion 32 located in the central region, and the fulcrum is away from the central region of the current collector 30, which is conducive to improving the stability of mutual support between adjacent current collectors 30, and reducing the risk of overturning of the stacked current collectors 30.

[0093] In an embodiment, the second protrusion 33 is protruded on the second surface 312 and separated from the first protrusion 32 (as shown in FIG. 11). When multiple current collectors 30 are stacked, among two adjacent current collectors 30, the second protrusion 33 on one current collector 30 connects the first surface 311 of the base 31 of the other current collector 30, the second protrusion 33 as a fulcrum is separated from the first protrusion 32 located in the central region, and the fulcrum is away from the central region of the current collector 30, which is conducive to improving the stability of mutual support between adjacent current collectors 30, and reducing the risk of overturning of the stacked current collectors 30.

[0094] As shown in FIGS. 12 and 13, in an embodiment, the projection of the second protrusion 33 is located within the projection of the first protrusion 32 on the projection plane perpendicular to the thickness direction of the base 31. When the current collector 30 is assembled in the battery 100, the current collector 30 of the embodiment is conducive to reducing the influence on the energy density of the battery 100.

[0095] In an embodiment, the extension direction of the second protrusion 33 is opposite to the extension direction of the first protrusion 32, which is conducive to reducing the influence of the second protrusion 33 on the total thickness of the current collector 30, and reducing the influence of the current collector 30 on the energy density of the battery 100.

[0096] In an embodiment, the second protrusion 33 does not protrude beyond the second surface 312 along the thickness direction of the base 31, which is beneficial to reduce the influence of the second protrusion 33 on the total thickness of the current collector plate 30 and the influence of the current collector plate 30 on the energy density of the battery 100.

[0097] In summary, in the current collector plate 30 of the present application, the first protrusion 32 arranged in the central region of the base 31 facilitates the welding connection of the shell 10, and the second protrusion 33 is additionally arranged to form an irregular shape on the surface of the base 31, which is beneficial to reduce the risk of mutual nesting between different current collector plates 30 when a plurality of current collector plates 30 are stacked, thereby reducing the influence of the nesting of the current collector plates 30 on the quality and energy density of the battery 100.

[0098] As shown in FIGS. 3 and 4, the embodiments of the present application also provide a battery 100, which comprises a shell 10, an electrode assembly 20, and the current collector plate 30 of any one of the preceding embodiments, the electrode assembly 20 and the current collector plate 30 are arranged in the shell 10, the shell 10 comprises a bottom wall 11, the electrode assembly 20, the current collector plate 30, and the bottom wall 11 are arranged, and the current collector plate 30 connects the electrode assembly 20 and the bottom wall 11. Among them, the first protrusion 32 extends towards the bottom wall 11 and connects the bottom wall 11.

[0099] In the above-mentioned battery 100, the second protrusion 33 is additionally arranged on the current collector plate 30 to form an irregular shape on the surface of the base 31 of the current collector plate 30, which is beneficial to reduce the risk of mutual nesting between different current collector plates 30 when a plurality of current collector plates 30 are stacked during the preparation of the battery 100, thereby reducing the influence of the nesting of the current collector plates 30 on the quality and energy density of the battery 100.

[0100] In an embodiment, the first protrusion 32 and the bottom wall 11 are welded.

[0101] In an embodiment, the base 31 and the electrode assembly 20 are welded.

[0102] In an embodiment, the battery 100 is a cylindrical battery, such as a cylindrical battery or a square cylindrical battery, and the like, which are not listed one by one.

[0103] As shown in FIG. 14, the embodiments of the present application also provide a battery pack 200, which comprises the battery 100 described above.

[0104] In the above-mentioned battery pack 200, the second protrusion 33 is additionally arranged on the current collector plate 30 of the battery 100 to form an irregular shape on the surface of the base 31 of the current collector plate 30, which is beneficial to reduce the risk of mutual nesting between different current collector plates 30 when a plurality of current collector plates 30 are stacked during the preparation of the battery 100, thereby reducing the influence of the nesting of the current collector plates 30 on the quality and energy density of the battery 100, and reducing the influence of the quality and energy density of the battery 100 on the battery pack 200.

[0105] As shown in FIG. 15, the embodiments of the present application also provide a power-using device 300 comprising the aforementioned battery 100 or the aforementioned battery pack 200.

[0106] In the aforementioned power-using device 300, by additionally arranging the second protruding part 33 on the current collector 30, the surface of the base part 31 of the current collector 30 is formed into an irregular shape, which is conducive to reducing the risk of mutual nesting between different current collectors 30 when the current collectors 30 are stacked during the preparation of the battery 100, thereby reducing the influence of the nesting of the current collectors 30 on the quality and energy density of the battery 100, and reducing the influence of the quality and energy density of the battery 100 on the power-using device 300.

[0107] In addition, those skilled in the art can make other changes within the spirit of the present application, of course, these changes made according to the spirit of the present application should be included in the scope disclosed by the present application.

Claims

1. A current collector plate, characterized by, The collector plate comprises: a base; a first protrusion provided in a central region of the base, the first protrusion extending in a thickness direction of the base; a second protrusion provided in the base, the second protrusion extending in the thickness direction of the base, the extending direction of the second protrusion being the same as or opposite to the extending direction of the first protrusion.

2. The collector plate according to claim 1, wherein the extending direction of the first protrusion is the same as the extending direction of the second protrusion; the first protrusion and the second protrusion are connected to each other to form a third protrusion; a projection of the third protrusion on a projection plane perpendicular to the thickness direction is not circular.

3. The collector plate according to claim 1 or 2, wherein a projection of the first protrusion on a projection plane perpendicular to the thickness direction is circular; the second protrusion is provided on a circumference of the first protrusion.

4. The collector plate according to any one of claims 1 to 3, wherein the collector plate comprises n second protrusions, n≥2; an included angle between a line connecting centers of any two adjacent second protrusions and a center of the first protrusion is a, a≤180°.

5. The collector plate according to claim 4, wherein n≥3； any two of the included angles are not equal.

6. The collector plate according to claim 4, wherein n≥3； in the n included angles, a largest included angle is a max, a smallest included angle is a min, a max-a min≥5°.

7. The current plate of claim 2, wherein a diameter of the base is d1, a diameter of a circumscribed circle of the third protrusion is d2, 10%≤d2 / d1≤70%.

8. The current plate of claim 7, wherein 20%≤d2 / d1≤40%.

9. The current plate of claim 2, wherein a diameter of the circumscribed circle of the third protrusion is d2, a diameter of the first protrusion is d3, 103%≤d2 / d3≤200%.

10. The current plate of claim 9, wherein 110%≤d2 / d3≤150%.

11. The current collector plate of any one of claims 2 to 9, wherein a projection of the third protrusion on a projection plane perpendicular to the thickness direction is any one of an ellipse, a triangle or a quadrilateral.

12. The current plate of claim 1, wherein a projection of the first protrusion and a projection of the second protrusion are apart from each other on a projection plane perpendicular to the thickness direction.

13. The current plate of claim 1, wherein a projection of the second protrusion is located within a projection of the first protrusion on a projection plane perpendicular to the thickness direction.

14. A battery, characterized by The battery pack according to claim 15.

15. A battery pack, characterized by The battery according to claim 14.

16. An electrical device, characterized by The battery according to claim 14 or the battery pack according to claim 15.

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