Cover assemblies, batteries, and electronic equipment

Abstract

To provide a cover assembly, a battery, and am electronic device having an external conductor member with improved reliability.SOLUTION: The present invention provides a cover assembly, a battery, and an electronic device. The electronic device includes a battery, and the battery includes a cover assembly. The cover assembly includes a cover body 1 and an electrode lead-out member. The cover body includes a cover through-hole. The electrode lead-out member 2 has an external conductor member 21 and an internal conductive member 22. The internal conductive member is installed while being inserted into the cover through-hole, electrically connected to a tab drawn out from an electrode assembly 2000, electrically connected to the external conductor member, and electrically connected to the external conductor member. The external conductor member includes a first metal layer 211 and a second metal layer 212 made from different materials, and a connection layer is disposed between the first metal layer and the second metal layer, thereby ensuring connection strength between the first metal layer and the second metal layer.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to the field of batteries, and particularly to a cover assembly, a battery, and an electronic device.

Background Art

[0002] Currently, commercially available electrode lead members are generally manufactured by soldering a copper plate and an aluminum plate. The copper plate is used for electrical connection to a tab drawn from an electrode assembly in a battery, and the aluminum plate is used for connection to an external aluminum bus bar.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In the prior art, since the copper plate and the aluminum plate are different metals, the connection reliability is poor, and the reliability of the external conductor member is reduced.

[0004] The present invention solves the above technical problems and provides a cover assembly, a battery, and an electronic device that overcome the drawback of low reliability of conventional external conductive members.

Means for Solving the Problems

[0005] The present invention solves the above technical problems by the following technical solutions. The cover assembly includes a cover body and an electrode lead member. The cover body has a cover through hole. The electrode lead member has an external conductor member and an inner conductive member. The inner conductive member is installed while being inserted into the cover through hole, is electrically connected to a tab drawn from an electrode assembly, and is electrically connected to the external conductor member. The external conductive member includes a first metal layer and a second metal layer having different materials, and a connection layer is disposed between the first metal layer and the second metal layer.

[0006] In this technical solution, the external conductive member includes a first metal layer and a second metal layer, and these two are connected via a connecting layer, thereby ensuring the strength of the connection between them and ensuring the reliability of the external conductive member.

[0007] Preferably, the first metal layer has a first through-hole, and at least a portion of the second metal layer is located within the first through-hole.

[0008] In this technical solution, since at least a portion of the second metal layer is located within the first through-hole of the first metal layer, the dimensions of the second metal layer are reduced, and the material cost of the second metal layer is reduced.

[0009] Preferably, a second through-hole is provided in the second metal layer, and at least a portion of the internal conductive member is located within the second through-hole and connected to the second metal layer at the second through-hole.

[0010] In this technical solution, the arrangement of the second through-hole allows the internal conductive member to extend into the second through-hole and connect to the second metal layer. In this way, an electrical connection is achieved between the outer conductive member and the inner conductive member, and the weight of the second metal layer can also be reduced.

[0011] Preferably, the first through-hole includes a through-hole portion and a recessed base portion. The recessed base portion is located on one side away from the electrode assembly of the first metal layer. The through-hole portion is located in the middle of the recessed base portion, and together with the through-hole portion, the recessed base portion forms a step. At least a portion of the second metal layer is connected to the side of the recessed base portion closer to the electrode assembly.

[0012] In this technical solution, the first through-hole is stepped, and one side of the recessed base closest to the electrode assembly can support the second metal layer, thus ensuring a secure connection between the first and second metal layers.

[0013] Preferably, the connecting layer is solder IncludesAt least a portion of the first metal layer and at least a portion of the second metal layer are connected by solder.

[0014] Alternatively, the second metal layer and the internal conductive material may be made of the same metal material. Includes The second metal layer and the internal conductive material are electrically connected.

[0015] In this technical solution, the second metal layer and the internal conductive member are made of the same metal material, and thus the second metal layer and the internal conductive member are connected.

[0016] Preferably, in the axial direction of the external conductive member, the first metal layer and the second metal layer overlap at least partially. One side of the connecting layer closer to the electrode assembly extends to the side of the overlapping portion of the first and second metal layers that is closer to the electrode assembly. One side of the connecting layer further away from the electrode assembly extends to the side of the overlapping portion of the first and second metal layers that is further away from the electrode assembly.

[0017] In this technical solution, the first metal layer and the second metal layer form an overlapping region in the axial direction of the external conductive member. Both ends of the connecting layer extend to both ends of the overlapping region, completely covering the overlapping region, thereby enhancing the connection effect between the first and second metal layers and improving the connection strength.

[0018] Preferably, a accommodating groove is formed between the opposing side walls of the first metal layer and the second metal layer, and the connecting layer extends at least partially into the accommodating groove.

[0019] In this technical solution, at least a portion of the connecting layer extends to the receiving groove. In this way, when the first metal layer and the second metal layer are connected via the connecting layer, it is prevented that the material of the connecting layer overflows and contaminates the surfaces of the first and second metal layers. The material of the connecting layer is contained in the receiving groove.

[0020] Preferably, in the axial direction of the outer conductive member, one side of the housing groove away from the electrode assembly does not extend beyond the one side of the first metal layer away from the electrode assembly.

[0021] Alternatively, in the axial direction of the outer conductive member, one side away from the electrode assembly of the connection layer extends to one side close to the electrode assembly of the accommodation groove.

[0022] In the technical solution of the present invention, since one side away from the electrode assembly of the accommodation groove does not exceed one side away from the electrode assembly of the first metal layer, when the first metal layer and the second metal layer are connected, it is possible to prevent the material of the connection layer from overflowing and contaminating the upper surface of the first metal layer.

[0023] One side away from the electrode assembly of the connection layer extends to one side close to the electrode assembly of the accommodation groove, so the connection strength between the first metal layer and the second metal layer is improved. Further, when the upper part of the connection layer does not exceed the accommodation groove, the accommodation groove can sufficiently accommodate the overflow of the material of the connection layer, so it is possible to prevent the material of the connection layer from overflowing.

[0024] Preferably, the connection layer and the accommodation groove are annular and surround the axis of the external conductive member.

[0025] In the technical solution of the present invention, since the connection layer is annular, the connection area between the first metal layer and the second metal layer becomes larger, the connection strength is improved, and the connection effect is improved. Since the shape of the accommodation groove conforms to the shape of the connection layer, the accommodation groove can well accommodate the overflowed material of the connection layer.

[0026] Preferably, the accommodation groove is formed in such a manner that an accommodation opening is arranged on the side wall of the first metal layer and / or the second metal layer.

[0027] In the technical solution, when a stepped accommodation opening is arranged only in one of the two metal layers, namely the first metal layer and the second metal layer, the surface of the other metal layer can be smoothed to facilitate processing. By arranging the accommodation opening on the metal layer, on the one hand, the weight of the metal layer is reduced, and on the other hand, the accommodation opening on the metal layer can also be conveniently used as a positioning part for the tool. When accommodation openings are arranged in both metal layers to integrally form an accommodation groove, since the connection joint of the two metal layers is located in the middle of the accommodation groove, the accommodation groove can well accommodate the material of the connection layer that overflows into the connection joint of the two metal layers.

[0028] Preferably, the width of the accommodation opening is 0.05 mm to 8 mm, and the depth is 0.05 mm to 4 mm.

[0029] In the technical solution, such an arrangement prevents the dimensions of the accommodation groove from being excessively small, thus preventing processing inconveniences and preventing adverse effects on the accommodation of the material of the connection layer. Furthermore, since the dimensions of the accommodation groove are prevented from being excessively large, the strength of the first metal layer and / or the second metal layer is also prevented from being excessively reduced.

[0030] Preferably, the first metal layer and the second metal layer are provided with concavo-convex structures that match each other.

[0031] In the technical solution, the arrangement of the concavo-convex structures that match each other achieves positioning and prevents rotation. The reliability of the electrical connection between the first metal layer and the second metal layer is improved, thereby improving the overcurrent reliability of the external conductive member.

[0032] Preferably, a first convex portion is arranged on one of the first metal layer and the second metal layer, and a first concave portion is arranged on the other of the first metal layer and the second metal layer, and the first convex portion and the first concave portion are adapted to form a concavo-convex structure.

[0033] The width of the first convex portion and the first concave portion is 0.2 mm to 8 mm, and the height is 0.1 mm to 4 mm.

[0034] In this technical solution, this arrangement prevents the dimensions of the first recess from becoming excessively large, thus preventing an excessive reduction in the strength of the first or second metal layer. Furthermore, since the dimensions of the first recess and the first protrusion are prevented from becoming excessively small, problems such as a decrease in the anti-rotation effect or inconvenience in processing are prevented.

[0035] Preferably, at least a portion of the first metal layer and at least a portion of the second metal layer are arranged sequentially in the axial direction of the outer conductive member, and the uneven structure is arranged along the axial direction of the outer conductive member.

[0036] In this technical solution, the uneven structure is arranged axially, resulting in a simple structure and easy assembly.

[0037] Preferably, one of the first metal layer and the second metal layer has a fitting recess, and at least a portion of the other of the first metal layer and the second metal layer is fitted into the fitting recess.

[0038] In this technical solution, the mating of the first metal layer and the second metal layer improves the connection reliability between them, thereby improving the overcurrent reliability of the external conductive member.

[0039] Preferably, the mating width between the first metal layer and the second metal layer is 0.2 mm to 15 mm.

[0040] In this technical solution, such an arrangement prevents the mating width from becoming excessively small, thus preventing mating failures. Furthermore, since the mating width is also prevented from becoming excessively large, the dimensions of the first and second metal layers are prevented from becoming excessively large.

[0041] The battery includes a housing, a cover assembly, and an electrode assembly. The cover assembly covers the housing and, together with the housing, defines the housing space. The electrode assembly is housed within the housing space.

[0042] Electronic devices include batteries. [Effects of the Invention]

[0043] The advantageous effects of this invention include the following:

[0044] The arrangement of the connecting layer between the first and second metal layers reduces the difficulty of connecting the first and second metal layers, while ensuring the connection strength between them, thereby ensuring the reliability of the external conductive member. [Brief explanation of the drawing]

[0045] [Figure 1] This is a schematic diagram showing the structure of the cover assembly provided by Embodiment 1 of the present invention. [Figure 2] This is a cross-sectional view AA in Figure 1. [Figure 3] This is an enlarged view of section B in Figure 2. [Figure 4] This is a schematic diagram showing the structure of the external conductor member provided by Embodiment 1 of the present invention. [Figure 5] This is a schematic diagram showing the connection structure between the first metal layer and the second metal layer provided by Embodiment 1 of the present invention. [Figure 6] This is a schematic exploded view of the structure of the external conductor member provided by Embodiment 1 of the present invention. [Figure 7] This is a schematic diagram showing the structure of the external conductor member provided by Embodiment 2 of the present invention. [Figure 8] Figure 7 is a cross-sectional view of CC. [Figure 9] This is a schematic diagram showing the connection structure between the first metal layer and the second metal layer provided by Embodiment 2 of the present invention. [Figure 10] This is a schematic exploded view of the structure of the external conductor member provided by Embodiment 2 of the present invention. [Figure 11] This is a schematic exploded view of the structure of the external conductor member provided by Embodiment 2 of the present invention. [Figure 12]This is a schematic diagram showing the structure of the external conductor member provided by Embodiment 3 of the present invention. [Figure 13] Figure 12 is a cross-sectional view of the DD. [Figure 14] This is a schematic exploded view of the structure of the external conductor member provided by Embodiment 3 of the present invention. [Figure 15] This is a schematic diagram showing the structure of the external conductor member provided by Embodiment 4 of the present invention. [Figure 16] Figure 15 is a cross-sectional view of EE. [Figure 17] This is a schematic exploded view of the structure of the external conductor member provided by Embodiment 4 of the present invention. [Figure 18] This is a schematic diagram showing the structure of the external conductor member provided by Embodiment 5 of the present invention. [Figure 19] Figure 18 is a cross-sectional view of EE. [Modes for carrying out the invention]

[0046] The following are preferred embodiments and, together with the accompanying drawings, provide a clearer and more complete description of the present invention.

[0047] The following points should be noted.

[0048] The dotted and dashed lines in the drawings are auxiliary lines placed to make the placement of parts and the boundaries between parts easier to understand and to facilitate display, and are not intended to represent the actual structure of the components.

[0049] In the axial direction, the thickness of the connecting layer is much thinner than the thickness of the first metal layer and also much thinner than the thickness of the second metal layer. To show the positional relationship of the connecting layer with respect to the first metal layer, the second metal layer and the housing groove, and to facilitate the representation of the connecting layer, Figure 1 shows the positional relationship of the connecting layer. In Figures 5 and 9, the radial thickness of the connecting layer increases, and the radial thickness of the second metal layer decreases. These do not represent the actual thickness of the connecting layer and the actual thickness of the second metal layer, and the illustration of the connecting layer is omitted in other figures.

[0050] Unless otherwise specified, the axial direction H refers to the axial direction of the external conductive member. Unless otherwise specified, the radial direction R refers to the radial direction of the external conductive member. If the outer conductive member is non-circular, the radial direction refers to the direction passing through the axis of the outer conductive member and perpendicular to the axis of the outer conductive member. Unless otherwise specified, the circumferential direction W refers to the circumferential direction of the external conductive member. In embodiments 1 to 5, the axial direction is parallel to the vertical direction, the external conductive member and the electrode lead member are coaxial, and the radial and axial directions of the external conductive member correspond to the radial and axial directions of the electrode lead member, respectively.

[0051] The two values ​​must be in the range of an extreme value (for example, 1 to 2, or 1 and 2 must be in the range of 1 and 2).

[0052] Embodiment 1

[0053] This embodiment provides an electronic device, which includes a battery, comprising a housing, a cover assembly, and cells. The cover assembly covers the housing and, together with the housing, defines a housing space. The battery is housed in the housing space and connected to an electrode assembly.

[0054] Electronic devices include, but are not limited to, laptop computers, pen-input computers, mobile computers, e-book players, mobile phones, portable fax machines, portable copiers, portable printers, stereo headphones, VCRs, LCD televisions, portable cleaners, portable CD players, MiniDiscs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, power-assisted bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, energy storage devices, or sodium-ion capacitors.

[0055] Here, Figures 1 to 6 are schematic diagrams showing the structure of the cover assembly 10000 provided by Embodiment 1 of the present invention. Other structures of the battery, excluding the cover assembly 10000, are published in numerous documents in the relevant art. For details, please refer to the relevant art.

[0056] As shown in Figures 1 to 6, the cover assembly 10000 includes a cover body 1 and an electrode lead member 2.

[0057] The cover body 1 has a cover through hole.

[0058] The electrode lead member 2 has an outer conductor member 21 and an inner conductive member 22.

[0059] The internal conductive member 22 is installed by being inserted into the cover through-hole, electrically connected to a tab pulled out from the electrode assembly 2000, and electrically connected to the external conductive member 21.

[0060] The external conductive member 21 includes a first metal layer 211 and a second metal layer 212 made of different materials, with a connecting layer 3 positioned between the first metal layer 211 and the second metal layer 212. By connecting the first metal layer 211 and the second metal layer 212 via the connecting layer 3, the difficulty in connecting the first metal layer 211 and the second metal layer 212 is reduced, and the connection strength between the first metal layer 211 and the second metal layer 212 is ensured, thereby ensuring the reliability of the external conductive member 21.

[0061] Optionally, as shown in Figure 6, a first through-hole 2111 is provided in the first metal layer 211. As shown in Figure 4, the second metal layer 212 is located within the first through-hole 2111, thus reducing the dimensions of the second metal layer 212 and lowering the material cost of the second metal layer 212.

[0062] Optionally, as shown in Figure 6, a second through-hole 2121 is provided in the second metal layer 212. As shown in Figure 3, a portion of the internal conductive member 22 is located within the second through-hole 2121 and connected to the second metal layer 212 at the second through-hole 2121. The arrangement of the second through-hole 2121 allows the internal conductive member 22 to extend into the second through-hole 2121 and be connected to the second metal layer 212. In this way, an electrical connection is achieved between the outer conductive member 21 and the inner conductive member 22, and the weight of the second metal layer 212 can also be reduced.

[0063] Specifically, in this embodiment, the first metal layer 211 is made of aluminum, and the second metal layer 212 is made of copper. The connecting layer 3 is made of solder, and the first metal layer 211 and the second metal layer 212 are connected by solder. The internal conductive member 22 is made of copper, and the tabs drawn out from the electrode assembly 2000 are also made of copper. Through holes are provided in the second metal layer 212, and the internal conductive member 22 is soldered through the second metal layer 212 at the through holes in the second metal layer 212.

[0064] Optionally, as shown in Figure 6, the first through-hole 2111 includes a through-hole portion 21111 and a recessed base portion 21112. As shown in Figure 3, the recessed base portion 21112 is located on one side of the first metal layer 211 away from the electrode assembly 2000. The through-hole portion 21111 is located in the middle of the recessed base portion 21112. The recessed base portion 21112 is The through-hole 21111 forms a step together with the through-hole 21111. At least a portion of the second metal layer 212 is connected to one side of the recessed base 21112 that is close to the electrode assembly 2000. Because the first through-hole 2111 is stepped, and one side of the recessed base 21112 that is close to the electrode assembly 2000 can support the second metal layer 212, the connection between the first metal layer 211 and the second metal layer 2212 is ensured.

[0065] As shown in Figures 3 and 5, the first metal layer 211 and the second metal layer 212 overlap at least partially in the axial direction of the external conductive member 21. One side of the connecting layer 3 closest to the electrode assembly 2000 extends to the side of the overlapping portion of the first metal layer 211 and the second metal layer 212 that is closest to the electrode assembly 2000. The other side of the connecting layer 3 furthest from the electrode assembly 2000 extends to the side of the overlapping portion of the first metal layer 211 and the second metal layer 212 that is furthest from the electrode assembly 2000. In other words, the first metal layer 211 and the second metal layer 212 form an overlapping region in the axial direction of the external conductive member 21. Both ends of the connecting layer 3 extend to both ends of the overlapping region, completely covering the overlapping region, thereby enhancing the connection effect between the first metal layer 211 and the second metal layer 212 and improving the connection strength.

[0066] Embodiment 2

[0067] Figures 7 to 11 are schematic diagrams showing the structure provided by Embodiment 2 of the present invention. In this embodiment, only the differences from Embodiment 1 will be described in detail. For other configurations in this embodiment, please refer to Embodiment 1 and other embodiments.

[0068] As shown in Figures 7 to 9, a accommodating groove 4 is formed between the opposing side walls of the first metal layer 211 and the second metal layer 212. As shown in Figure 9, the connecting layer 3 extends to the bottom of the accommodating groove 4. When the first metal layer 211 and the second metal layer 212 are connected via the connecting layer 3, the accommodating groove 4 can prevent the material of the connecting layer 3 from overflowing and contaminating the surfaces of the first metal layer 211 and the second metal layer 212. The material of the connecting layer 3 is contained in the accommodating groove 4.

[0069] As shown in Figure 9, in the axial direction of the outer conductor member 21, one side of the housing groove 4 away from the electrode assembly 2000 does not exceed the one side of the first metal layer 211 away from the electrode assembly 2000. In other words, the upper surface of the housing groove 4 is below the upper surface of the first metal layer 211. In this way, when the first metal layer 211 and the second metal layer 212 are connected, it is prevented that the material of the connecting layer 3 overflows and contaminates the upper surface of the first metal layer 211.

[0070] As shown in Figure 9, in the axial direction of the external conductive member 21, one side of the connecting layer 3 away from the electrode assembly 2000 extends to the side of the housing groove 4 closer to the electrode assembly 2000. In other words, the upper part of the connecting layer 3 extends to the bottom of the housing groove 4, thereby improving the connection strength between the first metal layer 211 and the second metal layer 212. Furthermore, if the upper part of the connecting layer 3 does not exceed the housing groove 4, the housing groove 4 can adequately accommodate any overflow of the connecting layer 3 material, thus preventing the material from overflowing.

[0071] As shown in Figure 9, since the connecting layer 3 and the housing groove 4 are annular in shape surrounding the axis of the external conductive member 21, the connection area between the first metal layer 211 and the second metal layer 212 is increased, improving the connection strength and enhancing the connection effect. Since the shape of the housing groove 4 matches the shape of the connecting layer 3, the housing groove 4 can effectively accommodate any excess material from the connecting layer 3.

[0072] As shown in Figures 10 and 11, receiving openings 41 are provided on both side walls of the first metal layer 211 and the second metal layer 212, together forming a receiving groove 4. In this way, the joint connecting the two metal layers is located in the middle of the receiving groove 4, so that the receiving groove 4 can effectively accommodate the material of the connecting layer 3 that overflows into the joint connecting the two metal layers. On the one hand, by providing the receiving openings 41 on the metal layers, the weight of the metal layers is reduced, and on the other hand, the receiving openings 41 on the metal layers can be conveniently used as tool positioning parts.

[0073] In other embodiments, the receiving opening 41 may be located in only one of the two metal layers, the first metal layer 211 and the second metal layer 212. In this case, the surface of the other metal layer can be smoothed to facilitate processing.

[0074] As shown in Figure 10, the width of the receiving opening 41 of the first metal layer 211 and the second metal layer 212 is both X1, X1 = 0.5 mm, and the depth is both X2, X2 = 0.5 mm. In other embodiments, the first metal layer and the second metal layer may have different widths and different depths. In other embodiments, X1 may be other values ​​such as 0.04 mm, 0.05 mm, 0.2 mm, 1 mm, 8 mm, and 10 mm, and X2 may be other values ​​such as 0.04 mm, 0.05 mm, 0.2 mm, 1 mm, 4 mm, and 5 mm. When X1 is between 0.05 mm and 8 mm and X2 is between 0.05 mm and 4 mm, it is possible to prevent the dimensions of each receiving opening 41 from becoming excessively small, thereby preventing inconvenience in processing. Furthermore, it is possible to prevent the dimensions of the receiving opening 41 from becoming excessively small, thereby preventing the formed receiving groove 4 from becoming excessively small and reducing the receiving effect. Furthermore, since the dimensions of the receiving opening 41 are prevented from becoming excessively large, the strength of the first metal layer 211 and the second metal layer 212 is also prevented from being excessively reduced. A more favorable effect can be obtained if X1 is 0.2 mm to 1 mm and X2 is 0.2 mm to 1 mm.

[0075] Embodiment 3

[0076] Figures 12 to 14 are schematic diagrams showing the structure provided by Embodiment 3 of the present invention. In this embodiment, only the differences from Embodiment 1 will be described in detail. For other configurations in this embodiment, please refer to Embodiment 1 and other embodiments.

[0077] As shown in Figures 12 to 14, a first protrusion 51 is positioned on the first metal layer 211, and a first recess is positioned on the second metal layer 212. The first protrusion 51 is inserted into the first recess and conforms to it to form a grooved structure, thereby achieving positioning and preventing rotation. In this way, the reliability of the electrical connection between the first metal layer 211 and the second metal layer 212 is improved, thereby improving the overcurrent reliability of the external conductive member 21. In other embodiments, the first protrusion 51 may be positioned on the second metal layer 212, and the first recess may be positioned on the first metal layer 211. The first protrusion 51 is inserted into the first recess and conforms to it to form a grooved structure.

[0078] In this embodiment, a portion of the first metal layer 211 and the second metal layer 212 are sequentially arranged in the axial direction of the external conductive member 21, and the uneven structure consisting of the first convex portion 51 and the first concave portion is arranged along the axial direction of the external conductive member 21, so the uneven structure is simple and easy to assemble.

[0079] Specifically, the first protrusion 51 is cylindrical. The width, i.e., diameter, of the first protrusion 51 is 0.5 mm, and the height of the portion of the first protrusion 51 that protrudes from the surface of the first metal layer 211 is 0.2 mm. The width and height of the first recess are the same as those of the first protrusion 51. The width of the first protrusion 51 refers to the width in the direction perpendicular to the axial direction of the first protrusion 51. The height of the first protrusion 51 refers to the height that protrudes axially from the surface of the first metal layer 211. In other embodiments, the widths of the first protrusion 51 and the first recess 52 may be other values ​​such as 0.1 mm, 0.2 mm, 0.5 mm, 2 mm, 8 mm, 10 mm, etc. The heights of the first protrusion 51 and the first recess 52 may be other values ​​such as 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 4 mm, 5 mm, etc. If the width and height of the first protrusion 51 and the first recess are 0.2 mm to 8 mm and 0.1 mm to 4 mm, the dimensions of the first recess are prevented from becoming excessively large, thereby preventing an excessive decrease in the strength of the first metal layer 211 and the second metal layer 212. Furthermore, since the dimensions of the first recess and the first protrusion 51 are prevented from becoming excessively small, problems such as a decrease in the anti-rotation effect or inconvenience in processing are prevented. A more favorable effect can be obtained if the width and height of the first protrusion 51 and the first recess 54 are 0.5 mm to 2 mm and 0.5 mm to 1 mm, respectively.

[0080] Embodiment 4

[0081] Figures 15 to 17 are schematic diagrams showing the structure provided by Embodiment 4 of the present invention. In this embodiment, only the differences from Embodiment 1 will be described in detail. For other configurations in this embodiment, please refer to Embodiment 1 and other embodiments.

[0082] As shown in Figures 15 to 17, the first metal layer 211 has a mating recess, and the second metal layer 212 is mated into the mating recess 2112 of the first metal layer 211. The mating of the first metal layer 211 and the second metal layer 212 improves the connection reliability between them and improves the overcurrent reliability of the external conductive member 21. In other embodiments, the mating recess 2112 may be located on the second metal layer 212. At least a portion of the first metal layer 211 is mated into the mating recess 2112, thereby achieving mating of the two metal layers. The method for mating the two structures is prior art.

[0083] As shown in Figure 16, let Y be the mating width between the first metal layer 211 and the second metal layer 212, and let Y = 1 mm. In other embodiments, Y may be other values ​​such as 0.1 mm, 0.2 mm, 1 mm, 5 mm, 15 mm, or 20 mm. If the value of Y is between 0.2 mm and 15 mm, the mating width will not become excessively small, thus preventing mating defects. Furthermore, since the mating width will not become excessively large, the dimensions of the first metal layer 211 and the second metal layer 212 will not become excessively large. Furthermore, the strength of the metal layer on which the mating recess 2112 is placed will not become excessively weak. A more favorable effect can be obtained when Y is between 1 mm and 5 mm.

[0084] Embodiment 5

[0085] Figures 18-19 are schematic diagrams showing the structure provided by Embodiment 4 of the present invention. In this embodiment, only the differences from Embodiment 1 will be described in detail. For other configurations in this embodiment, please refer to Embodiment 1 and other embodiments.

[0086] As shown in Figures 18 to 19, in this embodiment, the receiving opening 41 is located only on the side surface of the first metal layer 211 to form the receiving groove 4, so the side surface structure of the metal layer is smooth and easy to process. The first metal layer 211 has a first protrusion 51, and the second metal layer 212 has a first groove. The first protrusion 51 is inserted into the first groove to prevent rotation of the first metal layer 211 and the second metal layer 212. The first metal layer 211 has a fitting recess 2112. When the first metal layer 211 is fitted into the fitting recess 2112, the connection between the first metal layer 211 and the second metal layer 212 becomes more secure.

[0087] In this embodiment, the receiving opening 41 can be referenced to Embodiment 2, the first protrusion 51 and the first recess can be referenced to Embodiment 3, and the fitting recess 2112 can be referenced to Embodiment 4. Specifically, in this embodiment, the receiving opening 41 of the first metal layer 211 is located within the fitting recess 2112.

[0088] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely examples. The scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, all of which fall within the scope of protection of this disclosure. [Industrial applicability]

[0089] The cover assembly, battery, and electronic device of the present invention can be applied to the field of batteries. [Explanation of Symbols]

[0090] 10000: Cover Assembly 1: Cover body 2: Electrode extraction member 21: External conductor member 211: First metal layer 2111: First through hole 21111: Through hole section 21112: Recessed base 2112: Mating recess 212: Second metal layer 2121: Second through hole 22: Internal conductive material 3: Connectivity Layer 4: Storage groove 41: Containment opening 51: First convex part 2000: Electrode Assembly

Claims

1. A cover body having a cover through hole, An electrode extraction member having an external conductive member and an internal conductive member, Includes, The internal conductive member is installed while being inserted into the cover through-hole, electrically connected to a tab pulled out from the electrode assembly, and electrically connected to the external conductive member. The external conductive member is a plate-like structure having a through hole in its central region, and the external conductive member includes a first metal layer, a second metal layer, and a connecting layer made of different materials, the connecting layer being positioned between the first metal layer and the second metal layer in the radial direction of the external conductive member. The first metal layer has a first through hole, and a portion of the second metal layer is located within the first through hole. The second metal layer has a second through-hole, and at least a portion of the internal conductive member is located within the second through-hole and connected to the second metal layer within the second through-hole. Cover assembly.

2. The first through-hole includes a through-hole portion and a recessed base portion, the recessed base portion being located on one side of the first metal layer away from the electrode assembly, the through-hole portion being positioned in the middle of the recessed base portion, the recessed base portion together with the through-hole portion forming a step, and at least a portion of the second metal layer being connected to the side of the recessed base portion closer to the electrode assembly. The cover assembly according to claim 1.

3. The connecting layer is made of solder, and at least a portion of the first metal layer and at least a portion of the second metal layer are connected by solder. The second metal layer and the internal conductive member are made of the same metal material, and the second metal layer and the internal conductive member are electrically connected. The cover assembly according to claim 1.

4. In the axial direction of the external conductive member, the first metal layer and the second metal layer overlap at least partially, one side of the connecting layer closer to the electrode assembly extends to the side of the overlapping portion of the first metal layer and the second metal layer closer to the electrode assembly, and one side of the connecting layer away from the electrode assembly extends to the side of the overlapping portion of the first metal layer and the second metal layer away from the electrode assembly. The cover assembly according to claim 2.

5. A accommodating groove is formed between the opposing side walls of the first metal layer and the second metal layer, and the connecting layer extends at least partially into the accommodating groove. The cover assembly according to claim 1.

6. In the axial direction of the external conductive member, one side of the housing groove away from the electrode assembly does not extend beyond one side of the first metal layer away from the electrode assembly, or In the axial direction of the external conductive member, one side of the connecting layer away from the electrode assembly extends to the side of the housing groove closer to the electrode assembly. The cover assembly according to claim 5.

7. The receiving groove is formed in the side wall of the first metal layer and / or the second metal layer such that a receiving opening is provided. The cover assembly according to claim 5.

8. A first convex portion is provided on one of the first metal layer and the second metal layer, and a first concave portion is provided on the other of the first metal layer and the second metal layer, and the first convex portion and the first concave portion fit together to form an uneven structure. The width of the first protrusion and the first recess is 0.2 mm to 8 mm, and the height is 0.1 mm to 4 mm. The cover assembly according to claim 1.

9. At least a portion of the first metal layer and at least a portion of the second metal layer are arranged sequentially in the axial direction of the external conductive member, and the uneven structure is arranged along the axial direction of the external conductive member. The cover assembly according to claim 8.

10. One of the first metal layer and the second metal layer has a fitting recess, and at least a portion of the other of the first metal layer and the second metal layer is fitted into the fitting recess. The cover assembly according to claim 1.

11. The casing and A cover assembly according to any one of claims 1 to 10, the cover assembly covering the housing and defining a housing space together with the housing, The electrode assembly housed in the aforementioned accommodation space, A battery containing a battery.

12. An electronic device comprising the battery described in claim 11.

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