Cover assembly, button battery and electronic device

Abstract

The utility model relates to the technical field of batteries, and in particular to a cover plate assembly, a button battery and an electronic device. The cover plate assembly includes a cover sheet, a pole, an insulating layer and a metal layer. The cover sheet is provided with a through hole. The pole includes a first column and a second column. The second column extends outward from the first column. The first column is arranged on one side of the cover sheet. The second column is penetrated through the through hole, and the end of the second column away from the first column is arranged as an arc end protruding outward. The insulating layer is arranged on the second column, and there is a connection gap between the insulating layer and the second column. Along the thickness direction of the cover plate assembly, the outer edge of the insulating layer does not exceed the edge of the arc end, and the metal layer is arranged in the connection gap. The button battery includes the above-mentioned cover plate assembly. The electronic device includes the above-mentioned button battery. The internal structure of the cover plate assembly, the button battery and the electronic device using the cover plate assembly are compact and have high energy density.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate assembly, a button battery and an electronic device. Background Art

[0002] Button cells, also known as button cells, refer to batteries with a button-like appearance. Compared with cylindrical batteries, button cells have a larger diameter and a thinner thickness. Button cells generally include a shell and a cell. The cell is located in the shell. The shell includes a cover assembly and an outer shell. The outer shell is connected to the cover assembly. The cover assembly includes a pole and a cover sheet. While ensuring that the pole and the cover sheet are insulated, the pole and the cover sheet are generally connected by riveting.

[0003] At present, when button batteries are designed for covers, the covers are usually flat, that is, the end faces of the poles on the cover are generally designed to be flat. During the post-production of button batteries, it is necessary to paste insulating tape on the poles. If the end faces of the poles are designed to be flat, after the insulating tape is pasted on the poles, a certain gap will be generated inside the button battery, making the overall thickness of the button battery thicker, thereby reducing the overall energy density of the button battery. Utility Model Content

[0004] The main purpose of the utility model is to provide a cover plate assembly, a button battery and an electronic device, aiming to solve the technical problems of the existing button battery having a loose internal structure and low overall energy density of the button battery.

[0005] To achieve the above purpose, the utility model provides a cover assembly for a button battery, comprising:

[0006] A cover plate, wherein the cover plate is provided with a through hole;

[0007] A pole, the pole comprising a first column and a second column, the second column extending outward from the first column, the first column being arranged on one side of the cover plate, the second column passing through the through hole, and an end of the second column away from the first column being arranged as an arc end protruding outward;

[0008] an insulating layer, wherein the insulating layer is disposed on the second column, and a connecting gap exists between the insulating layer and the second column, and along the thickness direction of the cover plate assembly, an outer edge of the insulating layer does not exceed an edge of the arc end;

[0009] A metal layer is disposed in the connection gap.

[0010] In some embodiments, along the thickness direction of the cover plate assembly, a distance L1 between an outer edge of the insulating layer and an edge of the arc end portion satisfies: 0 mm ≤ L1 ≤ 0.075 mm.

[0011] In some embodiments, an adhesive layer is provided between the cover plate and the pole.

[0012] In some embodiments, along the radial direction of the cover plate assembly, a circumferential edge of the adhesive layer exceeds a circumferential edge of the first column.

[0013] In some embodiments, the total thickness D1 of the cover sheet, the adhesive layer and the first column satisfies: 0.45mm≤D1≤0.5mm, the thickness D2 of the insulating layer satisfies: 0.035mm≤D2≤0.04mm, and the thickness D3 of the outward protrusion of the arc end satisfies: D2≤D3≤1 / 10(D1-D2).

[0014] In some embodiments, along the radial direction of the cover plate assembly, a circumferential edge of the cover plate exceeds a circumferential edge of the first column.

[0015] In some embodiments, along the radial direction of the cover plate assembly, a length L2 of the circumferential edge of the cover plate beyond the circumferential edge of the first column satisfies: 2 mm ≤ L2 ≤ 2.5 mm.

[0016] Correspondingly, the utility model also proposes a button battery, comprising the cover assembly described in any of the above embodiments.

[0017] In some embodiments, the button battery further comprises:

[0018] A shell, wherein the shell is connected to the cover plate in the cover plate assembly so that a closed accommodating cavity is formed between the shell and the cover plate, and the arc end of the second cylinder in the cover plate assembly faces a side away from the accommodating cavity;

[0019] A battery cell is arranged in the accommodating cavity.

[0020] Correspondingly, the utility model also proposes an electronic device, comprising the button battery described in any of the above embodiments.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] In the technical solution of the utility model, the end face of the pole at the through hole of the cover is designed as an arc end face to form an outwardly protruding arch structure. When the insulating layer (the insulating layer can be an insulating tape) is pasted on the pole, the insulating layer can be closely attached to the pole along the arc edge of the arc end, and the top of the arc end of the pole is exposed in the connection gap, so that the metal layer can be welded to the connection gap in subsequent production, thereby realizing the conduction of current. In addition, since the pole at the connection gap is a protruding arc structure, it is conducive to maintaining good contact between the pole and the metal layer, ensuring the welding reliability between the pole and the metal layer, and improving the safety of button batteries.

[0023] In the cover plate assembly provided by the utility model, one end of the pole passing through the through hole of the cover plate is designed to be an outwardly protruding arc end structure. On the one hand, when the insulating layer is pasted on the pole, the gap between the insulating layer and the cover plate can be eliminated, and the compactness of the internal structure of the cover plate assembly can be improved, thereby improving the overall energy density of the button battery. On the other hand, when the metal layer is welded on the pole, the pole and the metal layer can maintain good contact, ensuring the reliability of the metal layer welding, thereby improving the safety of the button battery.

[0024] The button cell using the cover plate assembly has higher energy density and structural reliability. The electronic device using the button cell has longer battery life and operation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A front view of a cover plate assembly provided in one embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the structure of a cover plate assembly provided in one embodiment of the utility model;

[0028] Figure 3 A bottom schematic diagram of a cover plate assembly provided in one embodiment of the utility model;

[0029] Figure 4 A front view of a cover plate assembly provided in another embodiment of the utility model;

[0030] Figure 5 A front view of a button battery provided in accordance with an embodiment of the present utility model.

[0031] Description of Figure Numbers:

[0032] 100-cover plate assembly;

[0033] 110-cover plate; 120-pole; 130-insulating layer; 140-metal layer; 150-adhesive layer;

[0034] 111-through hole; 121-first column; 122-second column; 123-arc end; 131-connection gap;

[0035] 200-housing;

[0036] 210-accommodating chamber;

[0037] 300-battery cells.

[0038] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or", "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0042] Button cells, also known as button cells, refer to batteries with a button-like appearance. Compared with cylindrical batteries, button cells have a larger diameter and a thinner thickness. Button cells generally include a shell and a cell. The cell is located in the shell. The shell includes a cover assembly and an outer shell. The outer shell is connected to the cover assembly. The cover assembly includes a pole and a cover sheet. While ensuring that the pole and the cover sheet are insulated, the pole and the cover sheet are generally connected by riveting.

[0043] At present, when button batteries are designed for covers, the covers are usually flat, that is, the end faces of the poles on the cover are generally designed to be flat. During the post-production of button batteries, it is necessary to paste insulating tape on the poles. If the end faces of the poles are designed to be flat, after the insulating tape is pasted on the poles, a certain gap will be generated inside the button battery, making the overall thickness of the button battery thicker, thereby reducing the overall energy density of the button battery.

[0044] In order to solve the technical problems of the existing button battery with a non-compact internal structure and low overall energy density of the button battery, Figures 1 to 3The utility model provides a cover plate assembly 100 for a button battery in an embodiment. The cover plate assembly 100 includes a cover sheet 110, a pole 120, an insulating layer 130 and a metal layer 140. The cover sheet 110 may be a circular sheet structure. The cover sheet 110 is provided with a through hole 111. Specifically, the through hole 111 may be provided at the center of the cover sheet 110. The pole 120 includes a first column 121 and a second column 122. The second column 122 extends outward from the first column 121, so that the pole 120 is T-shaped as a whole. Structure, the first column 121 is arranged on one side of the cover plate 110, the second column 122 is passed through the through hole 111, and the end of the second column 122 away from the first column 121 is arranged as an arc end 123 protruding outward, the insulating layer 130 is arranged on the second column 122, and there is a connecting gap 131 between the insulating layer 130 and the second column 122, along the thickness direction of the cover plate assembly 100, the outer edge of the insulating layer 130 does not exceed the edge of the arc end 123, and the metal layer 140 is arranged in the connecting gap 131.

[0045] Specifically, in order to improve the compactness of the internal structure of the cover plate assembly 100, and thus improve the overall energy density of the button battery, in the present embodiment, the end face of the pole 120 at the through hole 111 of the cover plate 110 is designed as an arc end face to form an outwardly protruding arch height structure (the arch height structure is the height from the protruding apex of the pole 120 to the vertical point of the protruding edge of the pole 120), and when the insulating layer 130 is pasted on the pole 120 (the insulating layer 130 can be an insulating tape, and the insulating layer 130 can prevent the cover plate 110 from directly contacting the pole 120 and causing a short circuit in the button battery, which helps to improve the safety and reliability of the cover plate assembly 100 and the button battery.), the insulating layer 130 can be tightly attached to the pole 120 along the arc edge of the arc end 123, and the top end of the arc end 123 of the pole 120 is exposed in the connection gap 131, so that in subsequent production, the metal layer 140 can be welded to the connection gap 131, thereby realizing current conduction. In addition, since the pole 120 at the connection gap 131 is an arc structure protruding outward, it is beneficial to maintain good contact between the pole 120 and the metal layer 140, ensure the welding reliability between the pole 120 and the metal layer 140, and improve the safety of button battery use.

[0046] In the cover plate assembly 100 provided in this embodiment, one end of the pole 120 passing through the through hole 111 of the cover plate 110 is designed as an outwardly protruding arc end 123 structure. On the one hand, when the insulating layer 130 is pasted on the pole 120, the gap between the insulating layer 130 and the cover plate 110 can be eliminated, and the compactness of the internal structure of the cover plate assembly 100 is improved, thereby improving the overall energy density of the button battery. On the other hand, when the metal layer 140 is welded on the pole 120, the pole 120 and the metal layer 140 can maintain good contact, ensure the reliability of the welding of the metal layer 140, and thus improve the safety of the button battery.

[0047] In some embodiments, the metal layer 140 may be a nickel sheet, or the metal layer 140 may be an aluminum sheet. The material of the metal layer 140 may be adaptively selected according to the polarity of the pole 120 .

[0048] In some embodiments, reference Figure 4 In addition to setting the end of the second column 122 away from the first column 121 as an outwardly protruding arc end 123, the end of the first column 121 away from the second column 122 can also be set as an outwardly protruding arc end 123. In this case, the insulating layer 130 needs to be pasted to the first column 121, and there is a connecting gap 131 between the insulating layer 130 and the first column 121. Along the thickness direction of the cover assembly 100, the outer edge of the insulating layer 130 does not exceed the edge of the arc end 123. Similarly, the metal layer 140 is set in the connecting gap 131.

[0049] The design of "setting one end of the first column 121 away from the second column 122 as an outwardly protruding arc end 123" in this embodiment and the design of "setting one end of the second column 122 away from the first column 121 as an outwardly protruding arc end 123" in the above embodiment have the same energy density and structural effect. However, compared with the design of "setting one end of the first column 121 away from the second column 122 as an outwardly protruding arc end 123" in this embodiment, the design of "setting one end of the second column 122 away from the first column 121 as an outwardly protruding arc end 123" in the above embodiment is beneficial to increase the area of ​​the first column 121. When the cover plate assembly 100 and the winding core are connected, the winding core ear will be welded to the first column 121. The larger the area of ​​the first column 121, the more conducive it is to reducing the difficulty of welding, and the less likely it is to have cold welding, welding offset and the like.

[0050] In some embodiments, the through hole 111 may be a circular hole, a square hole, etc. Correspondingly, when the through hole 111 is a circular hole, the second column 122 is designed to be cylindrical, so that the second column 122 and the through hole 111 can be plugged together. When the through hole 111 is a square hole, the second column 122 is designed to be prismatic, so that the second column 122 and the through hole 111 can be plugged together. Compared with designing the through hole 111 as a circular hole, designing the through hole 111 as a square hole is conducive to improving the matching stability between the second column 122 and the through hole 111, and can effectively avoid the relative rotation between the second column 122 and the through hole 111 in the circumferential direction due to the circumferential torque of the pole 120, which affects the structural stability of the button battery.

[0051] In some embodiments, reference Figure 2 , along the thickness direction of the cover assembly 100, the distance L1 between the outer edge of the insulating layer 130 and the edge of the arc end portion 123 satisfies: 0mm≤L1≤0.075mm. Exemplarily, for example, the value of L1 can be 0mm, 0.01mm, 0.025mm, 0.03mm, 0.05mm, 0.075mm, etc.

[0052] Specifically, since the outer edge of the insulating layer 130 does not exceed the edge of the arc end 123 along the thickness direction of the cover assembly 100, that is, along the thickness direction of the cover assembly 100, the edge of the arc end 123 can be flush with the outer edge of the insulating layer 130, or, the edge of the arc end 123 can be higher than the outer edge of the insulating layer 130. In this embodiment, when the value of L1 is 0 mm, the edge of the arc end 123 is flush with the outer edge of the insulating layer 130, and when the value of L1 is not 0 mm, the edge of the arc end 123 is higher than the outer edge of the insulating layer 130.

[0053] By arranging the edge of the arc end 123 flush with the outer edge of the insulating layer 130, or extending the edge of the arc end 123 beyond the outer edge of the insulating layer 130, the overall energy density of the button battery can be effectively improved, and the structural stability of the button battery can be improved.

[0054] In some embodiments, reference Figures 1 to 3 An adhesive layer 150 is disposed between the cover sheet 110 and the pole 120. Exemplarily, for example, the adhesive layer 150 may be PP adhesive (polypropylene).

[0055] Specifically, in order to further improve the structural stability of the cover plate assembly 100 and prevent the pole 120 from shaking, in the present embodiment, an adhesive layer 150 is provided between the cover plate 110 and the first column 121, and the first column 121 is stably bonded to the cover plate 110 by the adhesive layer 150, thereby ensuring the reliability of the connection between the pole 120 and the cover plate 110.

[0056] Furthermore, in order to ensure the connection stability of the second column 122 in the through hole 111, in some embodiments, an adhesive layer 150 may also be provided between the second column 122 and the side wall of the through hole 111, so that an L-shaped adhesive layer 150 is formed between the pole 120 and the cover plate 110, which is beneficial to improving the structural stability of the cover plate assembly 100 and the sealing performance of the cover plate assembly 100.

[0057] In some embodiments, reference Figures 1 to 3 , along the radial direction of the cover assembly 100 , the outer peripheral edge of the adhesive layer 150 exceeds the outer peripheral edge of the first column 121 .

[0058] Specifically, in order to ensure the bonding stability between the pole 120 and the cover plate 110, in the present embodiment, a sufficient amount of adhesive layer 150 is arranged between the first column 121 of the pole 120 and the cover plate 110, so that each position of the first column 121 can be bonded to the cover plate 110 through the adhesive layer 150, thereby preventing the edge of the first column 121 from warping, etc., and ensuring the structural stability of the button battery.

[0059] In addition, the adhesive layer 150 is a non-conductive structure. The first column 121 of the pole 120 and the cover plate 110 are blocked by the adhesive layer 150, which can avoid direct contact between the cover plate 110 and the pole 120 and cause a short circuit in the button battery, which helps to improve the safety and reliability of the cover assembly 100 and the button battery.

[0060] In some embodiments, reference Figure 2, the total thickness D1 of the cover sheet 110, the adhesive layer 150 and the first column 121 satisfies: 0.45mm≤D1≤0.5mm, the thickness D2 of the insulating layer 130 satisfies: 0.035mm≤D2≤0.04mm, and the thickness D3 of the outward protrusion of the arc end portion 123 satisfies: D2≤D3≤1 / 10(D1-D2). Exemplarily, for example, the value of D1 can be 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, etc. The value of D2 can be 0.035mm, 0.036mm, 0.037mm, 0.038mm, 0.039mm, 0.04mm, etc. The value of the thickness D3 of the outward protrusion of the arc end 123 can be adaptively designed according to the value of the total thickness D1 of the cover sheet 110, the adhesive layer 150 and the first column 121 and the value of the thickness D2 of the insulating layer 130. For example, when the value of D1 is 0.5 mm and the value of D2 is 0.035 mm, according to D2≤D3≤1 / 10(D1-D2), it can be known that the value range of D3 at this time satisfies: 0.035 mm≤D3≤0.0465 mm, that is, the thickness of the outward protrusion of the arc end 123 is between 0.035 mm and 0.0465 mm (including the end value). Specifically, the value of D3 can be 0.035 mm, 0.04 mm, 0.045 mm, 0.0465 mm, etc.

[0061] Specifically, in order to ensure the structural stability of the button battery while taking into account the overall thickness of the button battery to improve the energy density of the button battery, in the present embodiment, the total thickness of the cover sheet 110, the adhesive layer 150 and the first column 121, the thickness of the insulating layer 130 and the thickness of the outward protrusion of the arc end 123 are specifically limited in value range. The cover plate assembly 100 of the button battery adopts the above-mentioned structural design, which can reduce the overall thickness of the button battery and improve the energy density of the button battery.

[0062] Furthermore, when D1>0.5mm, the overall cover assembly 100 occupies too much thickness space, resulting in capacity loss; when D1<0.45mm, each structure in the cover assembly 100 needs to be thinned, the composite effect of the cover assembly 100 deteriorates, and deformation and leakage failure are prone to occur.

[0063] Furthermore, the following calculation is based on 1154 (10.8*5.45) battery cells. When D1=0.40mm, the capacity is 62mAh, high temperature and high humidity 35 / 60pass, when D1=0.45mm, the capacity is 61mAh, high temperature and high humidity 60 / 60pass, when D1=0.50mm, the capacity is 60mAh, high temperature and high humidity 60 / 60pass, when D1=0.55mm, the capacity is 59mAh, high temperature and high humidity 60 / 60pass.

[0064] Furthermore, D2≤D3≤1 / 10(D1-D2), and D2 / D3≤1 can effectively ensure that the insulating layer 130 is embedded in the arc end portion 123 and does not occupy a thickness space alone.

[0065] Furthermore, the following calculation is based on 1154 (10.8*5.45) battery cells. When D1=0.045mm, D2=0.030mm, and D3=0.035mm, the maximum thickness of the battery cell (total thickness) is 5.45mm, and the surface insulating glue is too thin, resulting in wrinkles; when D1=0.045mm, D2=0.035mm, and D3=0.035mm, the maximum thickness of the battery cell is 5.45mm, and the insulating glue is not wrinkled; when D1=0.045mm, D2=0.04mm, and D3=0.035mm, the maximum thickness of the battery cell is 5.46mm, the battery cell is too thick, and the insulating glue is not wrinkled.

[0066] In some embodiments, reference Figures 1 to 3 , along the radial direction of the cover plate assembly 100 , the circumferential edge of the cover plate 110 exceeds the circumferential edge of the first column 121 .

[0067] Specifically, in this embodiment, along the radial direction of the cover plate assembly 100, the circumferential outer edge of the cover plate 110 is extended to the outside of the circumferential outer edge of the first column 121, which can ensure that the cover plate 110 covers the first column 121, prevents the first column 121 from being exposed, and ensures the safety performance of the pole 120.

[0068] In some embodiments, reference Figure 2 , along the radial direction of the cover plate assembly 100, the length L2 of the circumferential edge of the cover plate 110 beyond the circumferential edge of the first column 121 satisfies: 2mm≤L2≤2.5mm. Exemplarily, for example, the value of L2 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

[0069] Specifically, in the present embodiment, a specific numerical limit is imposed on the length range in which the circumferential edge of the cover sheet 110 exceeds the circumferential edge of the first column 121. The above-mentioned dimension design can ensure that the cover sheet 110 completely covers the first column 121 while avoiding increasing the overall volume of the cover plate assembly 100, thereby facilitating the button battery to develop in the direction of miniaturization and lightweight, and ensuring the overall energy density of the button battery.

[0070] Correspondingly, another embodiment of the present invention further provides a button battery, referring to Figure 5 The button battery includes the cover assembly 100 in any of the above embodiments.

[0071] In some embodiments, reference Figure 5 The button battery also includes a shell 200 and a battery cell 300. The shell 200 is connected to the cover plate 110 in the cover plate assembly 100 to form a closed accommodating cavity 210 between the shell 200 and the cover plate 110. The arc end 123 of the second column 122 in the cover plate assembly 100 faces the side away from the accommodating cavity 210, and the battery cell 300 is arranged in the accommodating cavity 210.

[0072] Among them, the battery cell 300 is provided with a positive electrode tab and a negative electrode tab, and the two tabs are respectively located at the upper and lower ends of the battery cell 300 to meet the insulation requirements inside the outer shell 200. The positive electrode tab at the upper end is welded to the lower end surface of the first column 121 of the pole 120, and the negative electrode tab at the lower end is welded to the bottom wall of the outer shell 200.

[0073] Specifically, in this embodiment, the button battery can be a lithium-ion button battery, etc. The button battery using the above-mentioned cover assembly 100 has higher energy density and structural reliability. Thanks to the improvement of the above-mentioned cover assembly 100, the button battery of this embodiment has the same technical effect as the above-mentioned cover assembly 100, which will not be repeated here.

[0074] Correspondingly, another embodiment of the present invention further provides an electronic device, which includes the button battery in any of the above embodiments.

[0075] Specifically, in this embodiment, the electronic device can be an electronic watch, an electronic toy, a calculator, a computer motherboard, etc. The electronic device using the button battery has a longer battery life and operation stability. Thanks to the improvement of the button battery, the electronic device of this embodiment has the same technical effect as the button battery, which will not be described in detail here.

[0076] It should be noted that the cover assembly 100, button battery and other contents of the electronic device disclosed in the present invention can be found in the prior art and will not be described in detail here.

[0077] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cover assembly for a button battery, characterized in that: include: A cover plate, wherein the cover plate is provided with a through hole; A pole, the pole comprising a first column and a second column, the second column extending outward from the first column, the first column being arranged on one side of the cover plate, the second column passing through the through hole, and an end of the second column away from the first column being arranged as an arc end protruding outward; an insulating layer, wherein the insulating layer is disposed on the second column, and a connecting gap exists between the insulating layer and the second column, and along the thickness direction of the cover plate assembly, an outer edge of the insulating layer does not exceed an edge of the arc end; A metal layer is disposed in the connection gap.

2. The cover plate assembly according to claim 1, characterized in that: Along the thickness direction of the cover plate assembly, a distance L1 between the outer edge of the insulating layer and the edge of the arc end portion satisfies: 0 mm ≤ L1 ≤ 0.075 mm.

3. The cover plate assembly according to claim 1, characterized in that: An adhesive layer is arranged between the cover plate and the pole.

4. The cover plate assembly according to claim 3, characterized in that: Along the radial direction of the cover plate assembly, the circumferential edge of the adhesive layer exceeds the circumferential edge of the first column.

5. The cover plate assembly according to claim 3, characterized in that: The total thickness D1 of the cover sheet, the adhesive layer and the first column satisfies: 0.45mm≤D1≤0.5mm, the thickness D2 of the insulating layer satisfies: 0.035mm≤D2≤0.04mm, and the thickness D3 of the outward protrusion of the arc end satisfies: D2≤D3≤1 / 10(D1-D2).

6. The cover plate assembly according to claim 1, characterized in that: Along the radial direction of the cover plate assembly, the circumferential edge of the cover plate exceeds the circumferential edge of the first column.

7. The cover plate assembly according to claim 6, characterized in that: Along the radial direction of the cover plate assembly, a length L2 of the circumferential edge of the cover plate exceeding the circumferential edge of the first column satisfies: 2mm≤L2≤2.5mm.

8. Button battery, characterized in that: A cover plate assembly comprising any one of claims 1 to 7.

9. The button cell according to claim 8, characterized in that: Also includes: A shell, wherein the shell is connected to the cover plate in the cover plate assembly so that a closed accommodating cavity is formed between the shell and the cover plate, and the arc end of the second cylinder in the cover plate assembly faces a side away from the accommodating cavity; A battery cell is arranged in the accommodating cavity.

10. An electronic device, characterized in that Including the button battery as described in claim 8 or 9.

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