CN114730952B

CN114730952B - Button cell and electronic equipment

Info

Publication number: CN114730952B
Application number: CN202180006453.3A
Authority: CN
Inventors: 张弛; 林礼清; 陈梦鹤; 刘常胜
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2024-03-12
Anticipated expiration: 2041-03-31
Also published as: CN114730952A; WO2022205188A1

Abstract

The application provides a battery comprising an electrode assembly, a first electrode, a second electrode and a first component, wherein the electrode assembly comprises a first conductive part with a first surface and a second surface; the first electrode comprises a first concave part with a first opening, the first concave part comprises a first wall and a second wall, and the electrode assembly is accommodated in the first concave part; the second electrode is arranged at the first opening; the first surface comprises a first area connected with the first electrode or the second electrode; the first component comprises an insulating material, and comprises a first end face, and the first end face is connected with the second face. The application also relates to an electronic device. By arranging the first component, when the battery is impacted externally, the impact of other parts in the electrode assembly to the first conductive part can be buffered, and the connection reliability between the first conductive part and the electrode is improved, so that the battery with longer service life and the electronic equipment are provided.

Description

Button cell and electronic equipment

Technical Field

The application relates to the technical field of button cells, in particular to a button cell and electronic equipment.

Background

As the consumer electronics industry enters a fast growth phase, such as the rapid growth of the bluetooth headset market, the demand for lithium ion button cells is rapidly increasing. In the face of intense industry competition, improving the reliability of button cells is critical to rapidly occupying market share.

The existing lithium ion button cell is usually welded with a pole post or a shell after a pole lug or a pole lug and a switching piece are welded, so that the electric connection between a pole piece and an electrode is ensured, the connection reliability between the pole lug or the switching piece and the shell or the pole post is difficult to ensure, and particularly, the risk of detachment exists in the external impact process such as falling.

Disclosure of Invention

In view of the above, it is necessary to provide a button cell and an electronic device, which can ensure connection between a tab or a tab and an electrode, reduce the risk of disconnection of the tab or the tab from the electrode when an external impact is applied, and provide a button cell and an electronic device having a longer lifetime.

Embodiments of the present application provide a button cell comprising an electrode assembly, a first electrode, a second electrode, and a first member, the electrode assembly comprising a first conductive portion having a first face and a second face; the first electrode comprises a first concave part with a first opening, the first concave part comprises a first wall and a second wall, and the electrode assembly is accommodated in the first concave part; the second electrode is arranged at the first opening; the first surface includes a first region in contact with the first electrode or the second electrode, the first member includes an insulating material, and the first member includes a first end surface in contact with the second surface.

Through adopting foretell button cell, first electrically conductive portion has the first face that meets with the electrode, simultaneously, sets up first material at the second face of first electrically conductive portion, when button cell receives external impact, can cushion the impact of other parts in the electrode assembly to first electrically conductive portion, improves the connection reliability between first electrically conductive portion and the electrode.

In some embodiments, the first region has a portion that coincides with the first member when viewed in a first direction perpendicular to the first region.

In some embodiments, the first member further comprises a second end surface opposite the first end surface, the second end surface interfacing with the electrode assembly.

In some embodiments, at least a portion of the first member meets the second wall.

In some embodiments, at least a portion of the first member is bonded to the second wall.

In some embodiments, the first opening is provided in the second wall.

In some embodiments, the first face includes a first region contiguous with the second electrode, the first member having a portion that does not overlap the first opening when viewed in a first direction perpendicular to the first region.

In some embodiments, the first member is disposed at a position farther from the first wall than a center portion of the second wall in a second direction perpendicular to the first wall.

In some embodiments, the first member has a portion that does not overlap the first opening, as viewed in a first direction perpendicular to the first region.

In some embodiments, the button cell further comprises a first cover covering the first recess.

In some embodiments, the second wall includes a curved second region and a flat third region, the first opening being provided in the third region.

In some embodiments, the electrode assembly further comprises a second conductive portion having a third face and a fourth face, the third face comprising a fourth region contiguous with an electrode of the first electrode and the second electrode that is distal from the first conductive portion; the button cell further comprises a second component, the second component comprises an insulating material, the second component comprises a third end face, and the third end face is connected with the fourth face.

In some embodiments, the fourth region has a portion that coincides with the second member, as viewed in a third direction perpendicular to the fourth region.

In some embodiments, the second component further comprises a fourth end face opposite the third end face, the fourth end face interfacing with the electrode assembly.

In some embodiments, at least a portion of the second member meets the second wall.

In some embodiments, at least a portion of the second member is bonded to the second wall. In some embodiments, the second member is bonded to the second wall on opposite sides of the second conductive portion.

In some embodiments, the second member has a portion that does not overlap the fourth region, as viewed in a third direction perpendicular to the fourth region.

In some embodiments, the second member is disposed at a position farther from the first wall than a center portion of the second wall in a second direction perpendicular to the first wall.

The embodiment of the application also provides electronic equipment, which comprises the button cell.

The button cell and the electronic equipment provided by the application reduce the impact received by the first conductive part by arranging the first part between the first conductive part and the electrode assembly, and improve the connection reliability, thereby obtaining the button cell and the electronic equipment with longer service life.

Drawings

Fig. 1 is a schematic perspective view of a button cell according to a first embodiment of the present application.

Fig. 2 is a schematic front view of the button cell shown in fig. 1.

Fig. 3 is a schematic cross-sectional view of the button cell shown in fig. 1 taken along the A-A direction.

Fig. 4 is a schematic cross-sectional view of another button cell shown in fig. 1 taken along the A-A direction.

Fig. 5 is a perspective schematic view of the button cell shown in fig. 2.

Fig. 6 is a perspective schematic view of the button cell shown in fig. 2 in another embodiment.

Fig. 7 is a schematic perspective view of the button cell shown in fig. 2 at another angle.

Fig. 8 is a schematic perspective view of the button cell shown in fig. 2 at another angle in another embodiment.

Fig. 9 is a schematic perspective view of the button cell shown in fig. 1 with the first cover removed.

Fig. 10 is a schematic top view of the button cell shown in fig. 9 with the first cover removed.

Fig. 11 is a schematic perspective view of a button cell in a second embodiment of the present application.

Fig. 12 is a schematic cross-sectional view of the button cell shown in fig. 11 taken along the B-B direction.

Fig. 13 is a schematic cross-sectional view of a button cell in a third embodiment of the present application.

Fig. 14 is a schematic perspective view of a button cell in a fourth embodiment of the present application.

Fig. 15 is a schematic cross-sectional view of the button cell shown in fig. 14 in the C-C direction.

Fig. 16 is a perspective schematic view of the button cell shown in fig. 14.

Fig. 17 is a schematic top view of the button cell shown in fig. 14 with the first cover removed.

Fig. 18 is a schematic perspective view of an electronic device according to a fifth embodiment of the present application.

Description of the main reference signs

Button cell 100

Housing (first electrode) 10

Bottom case 11

First wall 111

Second wall 112

Second region 1121

Third region 1122

First opening 113

First recess 114

First cover 12

Third wall 121

Second opening 1211

Second cover 122

Electrode assembly 20

First pole piece 21

Second pole piece 22

First conductive part 23

First face 231

First region 2311

Second face 232

First metal portion 233

First transfer portion 234

Second conductive part 24

Third face 241

Fourth region 2411

Fourth face 242

Second metal portion 243

Second adapter 244

Isolation film 25

Second electrode 30

First section material 40

First end face 41

Second end face 42

Second section bar 50

Third end face 51

Fourth end face 52

First layer 60

Insulating spacer 70

Electronic device 200

Body 80

Detailed Description

The following description of the embodiments of the present application will provide a clear and detailed description of the technical solutions of the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. Unless defined otherwise, 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 of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Hereinafter, embodiments of the present application will be described in detail. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and detailed to those skilled in the art.

In addition, the dimensions or thicknesses of various components, layers may be exaggerated in the drawings for brevity and clarity. Like numbers refer to like elements throughout. As used herein, the term "and/or," "and/or" includes any and all combinations of one or more of the associated listed items. In addition, it should be understood that when element a is referred to as "connecting" element B, element a may be directly connected to element B, or intermediate element C may be present and element a and element B may be indirectly connected to each other.

Further, the use of "may" when describing embodiments of the present application refers to "one or more embodiments of the present application.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting of the application. As used herein, the singular is intended to include the plural as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, values, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, values, steps, operations, elements, components, and/or groups thereof.

Spatially relative terms, such as "upper" and the like, may be used herein for convenience of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that spatially relative terms are intended to encompass different orientations of the device or apparatus in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other elements or features would then be oriented "below" or "beneath" the other elements or features. Thus, the exemplary term "upper" may include both upper and lower directions. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

Embodiments of the present application provide a button cell comprising an electrode assembly, a first electrode, a second electrode, and a first member, the electrode assembly comprising a first conductive portion having a first face and a second face; the first electrode comprises a first concave part with a first opening, the first concave part comprises a first wall and a second wall, and the electrode assembly is accommodated in the first concave part; the second electrode is arranged at the first opening; the first face includes a first region that meets the first electrode or the second electrode, the first member includes an insulating material, and the first member includes an opposing first end face that meets the second face.

Through adopting foretell button cell, first electrically conductive portion has the first face that meets with the electrode, simultaneously, sets up first material at the second face of first electrically conductive portion, when button cell receives external impact, can cushion the impact of other parts in the electrode assembly to first electrically conductive portion, improves the connection reliability between first electrically conductive portion and the electrode. In addition, in order to ensure the connection reliability during the preparation of the button cell, the tab or the switching piece of the bare cell after being inserted into the shell is required to be closely attached to the shell or the pole, and for this problem, a pressing knife is usually adopted to insert the shell, and the pressing knife is inserted between the bare cell and the tab or the switching piece, and presses the tab or the switching piece during welding, so that the tab or the switching piece is closely attached to the shell or the pole. But the cutter is difficult to debug and control in shell entering precision and stroke, and in the welding process, because the cutter needs to compress the lug or the switching piece, the cutter is easy to weld with the lug or the switching piece together, thereby lead to the reduction of the surface evenness of the cutter, the lug or the switching piece is difficult to ensure the close fit between the shell or the pole in the subsequent welding process, and the first component is arranged on the second surface of the first conductive part, so that the first component is positioned between the first conductive part and the cutter, the cutter is convenient to compress the first conductive part and the electrode, the welding reliability between the first conductive part and the electrode is ensured, in addition, the cutter is prevented from being damaged in the welding process due to the isolation effect of the first component, thereby simplifying the production process and reducing the production cost.

The embodiment of the application also provides electronic equipment, which comprises the button cell. By adopting the button cell, the electronic equipment improves the reliability of the electronic equipment, and reduces the cost of the electronic equipment as a whole due to the reduction of the cost of the button cell.

Some embodiments will be described below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Referring to fig. 1, 2 and 3, for better description of the structure of the button cell 100, the coordinate axes of X, Y, Z will be described, wherein the coordinate axes of X, Y, Z are perpendicular to each other, and the direction perpendicular to the plane of the first region 2311 is the X-axis direction. The button cell 100 provided in the first embodiment of the present application includes a case 10 (first electrode), an electrode assembly 20, a second electrode 30 and a first member 40, the electrode assembly 20 is contained in the case (first electrode) 10, the electrode assembly 20 includes a first conductive portion 23 having a first face 231 and a second face 232, the second electrode 30 is disposed on the case 10, the first member 40 is located on the second face 232 of the first conductive portion 23, wherein the first member 40 can protect the first conductive portion 23, and when the button cell is impacted externally, impact of other portions of the electrode assembly to the first conductive portion 23 is buffered, so that connection reliability between the first conductive portion 23 and the electrode is improved. In addition, during the preparation of the button cell, the first region 2311 of the first surface 231 can be closely attached to the case (first electrode) 10 or the second electrode 30, so that the welding between the first region 2311 and the case (first electrode) 10 or the second electrode 30 is facilitated.

Referring to fig. 1, 2 and 3, the case (first electrode) 10 includes a bottom case 11 and a first cover 12, and the first cover 12 is fixed on the bottom case 11 to protect the electrode assembly 20. A second conductive portion 24 is connected to the bottom case 11 to enable electrical communication between the bottom case 11 and the electrode assembly 20.

The bottom shell 11 includes a first wall 111 and a second wall 112, and the second wall 112 is disposed on a peripheral side of the first wall 111 and is perpendicular to the first wall 111, where a deviation between the second wall 112 and the first wall 111 is within ±5°. The housing 10 is further provided with a first opening 113, the first opening 113 is formed on the second wall 112, and the second electrode 30 is disposed at the first opening 113. The first wall 111 and the second wall 112 together define a first recess 114, and the electrode assembly 20 is accommodated in the first recess 114. The first cover 12 is fixed to an end of the second wall 112 away from the first wall 111, and covers the first recess 114, so that the electrode assembly 20 is accommodated in the case 10. The materials of the bottom shell 11 and the first cover 12 may include at least one of steel, copper, aluminum, nickel, and plastic; the material of the second electrode 30 may include at least one of copper, nickel, and aluminum.

Referring to fig. 1 and 2, the second wall 112 includes a curved second region 1121 and a flat third region 1122, and the second region 1121 and the third region 1122 meet. Further, the first opening 113 is provided in the third region 1122, so that the housing 10 can better fix the second electrode 30, and the assembly efficiency between the housing 10 and the second electrode 30 is improved, and it is also possible to provide the first opening 113 in a curved region such as the second region 1121, and provide the second electrode 30 in the first opening 113. The second wall 112 includes a curved second region 1121, and in order to further adapt to the electrode assembly 20, the curved second region 1121 is provided, so that the accommodating space of the case 10 is increased, a larger volume of the electrode assembly 20 can be accommodated, and the overall energy density of the button cell 100 is improved.

Referring to fig. 1 and 3, the first cover 12 includes a third wall 121, and the first cover 12 is fixed on the second wall 112 to cover the first recess 114. In an embodiment, the third wall 121 is provided with a second opening 1211, and the second opening 1211 is disposed closer to the first opening 113 than the geometric center of the third wall 121, and the electrolyte may be injected into the bottom case 11 through the second opening 1211. In order to cover the second opening 1211, the first cover 12 further includes a second cover 122, where the second cover 122 is disposed at the position of the second opening 1211 and extends toward the inside of the housing 10 to cover the second opening 1211, so as to prevent liquid, such as water, from flowing into the housing 10 from the second opening 1211 and electrolyte from flowing out from the second opening 1211. Providing the second opening 1211 near the first opening 113 can improve the filling efficiency.

In one embodiment, the first wall 111, the second wall 112, and the first opening 113 are integrally formed. The first cover 12 is disposed on the housing 10, and the second cover 122 is disposed on the third wall 121.

Referring to fig. 3, the electrode assembly 20 includes a first electrode sheet 21, a second electrode sheet 22, and a separator 25, wherein the separator 25 is disposed between the first electrode sheet 21 and the second electrode sheet 22.

Lamination of the first electrode sheet 21, the separator 25, and the second electrode sheet 22 forms a laminated electrode assembly 20. The formation of the electrode assembly 20 is common in the field of manufacturing the button cell 100, and will not be described here.

The electrode assembly 20 further includes a first conductive portion 23 having a first face 231 and a second face 232, the first face 231 and the second face 232 being opposite surfaces of the first conductive portion 23. In this embodiment, the first conductive portion 23 is connected to the first pole piece 21. In some embodiments, the first conductive portion 23 may also be part of the first pole piece 21. The electrode assembly 20 is connected to the second electrode 30 through the first conductive part 23, thereby achieving electrical communication between the electrode assembly 20 and the second electrode 30. The first conductive part 23 and the second electrode 30 may be connected by welding and/or an adhesive material having conductivity.

In this embodiment, after the electrode assembly 20 is disposed in the case 10, the first surface 231 of the first conductive part 23 is closer to the second electrode 30 than the second surface 232, and the first surface 231 includes a first region 2311 connected to the second electrode 30, and the first region 2311 and the second electrode 30 may be connected by welding and/or an adhesive material having conductivity to achieve electrical communication between the electrode assembly 20 and the second electrode 30.

In some embodiments, the first conductive portion 23 includes a plurality of first metal portions 233 and a first transfer portion 234, the first metal portions 233 are connected to the first pole piece 21, in some embodiments, the first metal portions 233 are a portion extending from the first pole piece 21, the plurality of first metal portions 233 are stacked to form a whole and are connected by welding, the first transfer portion 234 is welded to the plurality of first metal portions 233 formed to form a whole, and the first face 231 is a face corresponding to the second electrode 30 of the first transfer portion 234.

In one embodiment, the first electrode sheet 21 is a positive electrode sheet, and the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector. The positive electrode active material layer may be located on one side or both sides of the positive electrode current collector. In some embodiments, the positive current collector may be aluminum foil, although other positive current collectors commonly used in the art may be used. In some embodiments, the positive electrode active material may include at least one of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium iron manganese phosphate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate, or lithium nickel manganate, and the positive electrode active material may be subjected to doping and/or cladding treatment. The first metal portion 233 is a positive electrode tab. The connection content between the positive electrode tab and the positive electrode sheet is common in the technical field of manufacturing the button cell 100, and will not be described herein.

By providing the first adapter 234, the connection between the electrode assembly 20 and the second electrode 30 is facilitated. It will be appreciated that in other embodiments, the first adaptor 234 may be omitted, and the first metal portion 233 may be extended, so that the first metal portion 233 is directly connected to the second electrode 30.

Referring to fig. 3, the electrode assembly 20 further includes a second conductive portion 24 having a third face 241 and a fourth face 242, wherein the third face 241 and the fourth face 242 are opposite surfaces of the second conductive portion 24. In this embodiment, the second conductive portion 24 is connected to the second pole piece 22. In some embodiments, the second conductive portion 24 may also be part of the second pole piece 22. The electrode assembly 20 is connected to the case 10 through the second conductive part 24, thereby achieving electrical communication between the electrode assembly 20 and the case 10. The second conductive portion 24 and the case 10 may be connected by welding and/or an adhesive material having conductivity.

In this embodiment, after the electrode assembly 20 is disposed in the case 10, the third face 241 of the second conductive portion 24 is closer to the case 10 than the fourth face 242, and the third face 241 includes a fourth region 2411 that is connected to the case 10, and the fourth region 2411 and the case 10 may be connected by welding and/or an adhesive material having conductivity to achieve electrical communication between the electrode assembly 20 and the case 10.

In some embodiments, the second conductive portion 24 includes a plurality of second metal portions 243 and a second transfer portion 244, where the second metal portions 243 are connected to the second pole piece 22, and in some embodiments, the second metal portions 243 are a part extending from the second pole piece 22, and the plurality of second metal portions 243 are stacked to form a whole and connected by welding, and the second transfer portion 244 is welded to the plurality of second metal portions 243 formed to form a whole, and the third surface 241 is a surface of the second transfer portion 244 corresponding to the housing 10.

In an embodiment, the second electrode tab 22 is a negative electrode tab, which may include a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector. The anode active material layer may be disposed on one side or both sides of the anode current collector. In some embodiments, the negative electrode current collector may employ at least one of a copper foil, a nickel foil, or a carbon-based current collector. In some embodiments, the anode active material layer may include an anode active material. In some embodiments, the negative electrode active material includes at least one of a carbon material or a silicon-based material. In some embodiments, the carbon material comprises at least one of graphite, hard carbon, soft carbon; the silicon-based material includes at least one of silicon, a silicon oxygen compound, a silicon carbon compound, or a silicon alloy. The second metal portion 243 is a negative electrode tab. The connection content between the negative electrode tab and the negative electrode tab is common in the technical field of manufacturing the button cell 100, and will not be described herein.

By providing the second transfer part 244, connection between the electrode assembly 20 and the case 10 is more facilitated. It will be appreciated that in other embodiments, the second adapter 244 may be omitted and the second metal portion 243 may be extended so that the second metal portion 243 is directly connected to the housing 10.

Referring to fig. 3, the second electrode 30 is disposed at the first opening 113, and the second electrode 30 is fastened to an outer wall forming the first opening 113. An insulating spacer 70 is disposed between the second electrode 30 and the second wall 112, and is used for isolating the second electrode 30 from the second wall 112, so as to avoid the situation that electrical communication occurs between the two to cause short circuit of the button cell 100.

The second electrode 30 is a pole, and the first conductive portion 23 is welded to the pole, so as to achieve electrical conduction between the electrode assembly 20 and the pole. It will be appreciated that in other embodiments, the second electrode 30 is not limited thereto, and may be replaced with other structures having equivalent efficacy or function.

Referring to fig. 3, when the electrode assembly 20 is disposed in the case 10, the first member 40 is disposed on the second surface 232 of the first conductive portion 23, and the first end surface 41 thereof is in contact with the second surface 232. In an embodiment, the first member 40 has a sheet structure, and the first member 40 contains an insulating material to isolate the second electrode 22 from the first conductive portion 23, so as to reduce the occurrence of short circuit of the button cell 100 caused by electrical communication between the two. The first member 40 also protects the first conductive portion 23, and when the button cell is subjected to external impact, the impact of other parts of the electrode assembly on the first conductive portion 23 is buffered, thereby improving the connection reliability between the first conductive portion 23 and the electrode. The insulating material may comprise a polymer which has excellent insulation and low hardness, and is capable of deforming when impacted, thereby providing a cushioning effect. In some embodiments, the polymer comprises at least one of polyethylene, polypropylene, polyurethane, styrene-butadiene rubber, acrylate elastomers. In some embodiments, the first member 40 has a higher elasticity than the housing 10, the second electrode 30, or the first conductive portion 23. In some embodiments, the first member 40 has an elastic modulus in the range of 0.2-2N/mm.

Referring to fig. 4, the first member 40 further includes a second end face 42 opposite to the first end face 41, where the second end face 42 is connected to the main body of the electrode assembly 20, and the main body of the electrode assembly 20 includes a first pole piece 21, a second pole piece 22, a separator 25, and an integral structure formed by adjacent portions of the pole tabs and the pole pieces, when an external impact is applied, the second end face 42 of the first member 40 is connected to the main body of the electrode assembly 20, so as to inhibit the electrode assembly 20 from shaking in the case 10, reduce the pulling of the first conductive portion 23, reduce the risk of connection between the first conductive portion 23 and the electrode, and further increase the service life of the button cell. In one embodiment, the first member 40 comprises a square block structure, a rectangular block structure, a cylindrical structure, and the first member 40 comprises an insulating material. In some embodiments, the first member 40 is an insulating foam.

It is to be understood that in other embodiments, the shape of the first member 40 is not limited thereto. For example, other columnar shapes such as elliptic columns may be substituted. The insulating material of the first member 40 is not limited to the insulating foam, and may be replaced by other structures having equivalent functions or actions.

In some embodiments, the first member 40 is disposed between the first conductive portion 23 and the main body of the electrode assembly 20 by adopting an interference fit, so that the first conductive portion 23 is pressed by the first member 40 to be tightly attached to the second electrode 30, thereby replacing the original knife pressing process and improving the convenience of welding between the second electrode 30 and the first conductive portion 23.

Referring to fig. 3, at least a portion of the first member 40 may be connected to the second wall 112. At this time, the first member 40 can protect the edge of the connection region between the first conductive portion 23 and the electrode, and ensure the connection reliability. In some embodiments, at least a portion of the first member 40 may be bonded to the second wall 112. Through the bonding effect between the first component 40 and the second wall 112, the first conductive part 23 can be tightly attached to the second electrode 30, so that the shaking of the first conductive part when external impact is received can be further suppressed, the reliability of connection is ensured, the original knife pressing process can be replaced in the preparation process of the button cell, and the convenience of connection between the second electrode 30 and the first conductive part 23 is improved. In some embodiments, the first member 40 is adhered to the second wall 112 at two opposite sides of the first conductive portion 23, so as to further ensure a close contact effect and improve the reliability of welding. In some embodiments, the surface of the first member 40 has an adhesive material, for example, the first member 40 may be an insulating tape.

Referring to fig. 4 and 5, fig. 5 is a perspective schematic view of the button cell 100, wherein broken lines indicate structures disposed inside the case 10, specifically the electrode assembly 20 and the first member 40. The first region 2311 has a portion overlapping with the first member 40, as viewed in a first direction perpendicular to the first region 2311. Wherein the first direction is along the X-axis direction.

As shown in fig. 5, the dashed lines indicate the electrode assembly 20 and the first member 40, and it can be observed that the portion where the first member 40 overlaps the first region 2311, that is, the surface of the connection region between the first conductive portion 23 and the electrode has the first member 40, so that the impact of other portions of the electrode assembly 20 directly on the connection region can be buffered, and the connection reliability between the first conductive portion 23 and the electrode can be improved; in addition, during the process of preparing the button cell, the first region 2311 on the first surface 231 is better adhered to the second electrode 30 when the first member 40 presses the first conductive portion 23, so that the welding between the first region 2311 and the second electrode 30 is facilitated, and the stability of the welding between the first conductive portion 23 and the second electrode 30 is improved.

Referring to fig. 5, in an embodiment, the first member 40 has a portion not overlapping with the first opening 113 when viewed along the X-axis direction. That is, the first member 40 has a portion exceeding the first opening 113, and is disposed such that the first member 40 has a portion larger than the first opening 113 in the other direction, and the first member 40 can better protect the connection structure between the first conductive portion 23 and the second electrode 30 and/or between the second electrode 30 and the case 10 at the first opening 113, buffer the impact received thereat, and improve the stability of the connection; in the preparation process of the button cell, the first component 40 can better compress the first conductive part 23, so that the first conductive part 23 with a larger area is attached to the second electrode 30 positioned at the first opening 113, thereby fully ensuring that the first conductive part 23 has enough area to be connected with the second electrode 30, and ensuring the stability of connection between the two parts.

Referring to fig. 4, in an embodiment, the first member 40 is disposed at a position farther from the first wall 111 than a center portion of the second wall 112 in a second direction perpendicular to the first wall 111. Wherein the second direction is along the Z-axis direction. The first member 40 is disposed above the center portion of the second wall 112 with respect to the center portion of the second wall 112 in the direction along the Z-axis, so that the first member 40 is away from the first wall 111. Wherein the center of the second wall 112 is at a midpoint position.

The first member 40 is disposed at a position farther from the first wall 111, so that the first member 40 can better press the first transfer portion 234 in the first conductive portion 23, avoiding interference between the first member 40 and the stacked plurality of first metal portions 233, thereby affecting connection between the first metal portions 233 and the first transfer portion 234.

Referring to fig. 6, in an embodiment, along the Y-axis direction in fig. 6, there is a case where the length of the first member 40 is smaller than the length of the first conductive portion 23.

Referring to fig. 3, the button cell 100 further includes a second member 50, wherein the second member 50 is disposed on a fourth surface 242 of the second conductive portion 24, and the third end surface 51 thereof is connected to the fourth surface 242 when the electrode assembly 20 is disposed in the case 10. In an embodiment, the second member 50 has a substantially sheet-like structure, and the second member 50 contains an insulating material to isolate the first electrode sheet 21 from the second conductive portion 24, so as to reduce the occurrence of short circuit of the button cell 100 caused by electrical communication between the two. The second member 50 also protects the second conductive portion 24, and when the button cell is subjected to an external impact, the impact of other parts of the electrode assembly 20 on the second conductive portion 24 is buffered, thereby improving the connection reliability between the second conductive portion 24 and the electrode. The insulating material may comprise a polymer which has excellent insulation and low hardness, and is capable of deforming when impacted, thereby providing a cushioning effect. In some embodiments, the polymer comprises at least one of polyethylene, polypropylene, polyurethane, styrene-butadiene rubber, acrylate elastomers. In some embodiments, the second member 50 is more resilient than the housing 10 or the second conductive portion 24. In some embodiments, the second member 50 has an elastic modulus in the range of 0.2-2N/mm.

Referring to fig. 4, the second member 50 further includes a fourth end surface 52 opposite to the third end surface 51, the fourth end surface 52 is in contact with the main body portion of the electrode assembly 20, and when an external force is applied, the fourth end surface 52 of the second member 50 is in contact with the main body portion of the electrode assembly 20, so as to inhibit the electrode assembly 20 from shaking in the case 10, reduce the pulling of the second conductive portion 24, and reduce the risk of detachment of the second conductive portion 24 from the electrode, thereby increasing the life of the button cell. In one embodiment, the second member 50 has a substantially square block structure, and the second member 50 comprises an insulating material. In some embodiments, the second member 50 is an insulating foam.

It is understood that in other embodiments, the shape of the second member 50 is not limited thereto. For example, other shapes such as cylindrical may be substituted. The insulating material of the second member 50 is not limited to the insulating foam, and may be replaced by other structures having equivalent functions or actions.

In some embodiments, the second member 50 is disposed between the second conductive portion 24 and the main body of the electrode assembly 20 by using an interference fit, so that the second conductive portion 24 is pressed by the second member 50 to be tightly attached to the second wall 112 of the button cell 100, thereby replacing the original pressing process and improving the convenience of welding between the second wall 112 and the second conductive portion 24.

Referring to fig. 3, at least a portion of the second member 50 may be connected to the second wall 112. At this time, the second member 50 can sufficiently protect the edge of the electrode connection region with the second conductive portion 24, and ensure the connection reliability. In some embodiments, at least a portion of the second member 50 may be bonded to the second wall 112. Through the bonding effect between the second member 50 and the second wall 112, the second conductive portion 24 can be tightly attached to the second wall 112, so that the shaking of the second conductive portion 24 when external impact is received can be further suppressed to ensure the reliability of connection, and the original knife pressing process can be replaced, so that the convenience of welding between the second wall 112 and the second conductive portion 24 is improved. In some embodiments, the second member 50 is adhered to the second wall 112 at two opposite sides of the second conductive portion 24, so as to further ensure a close contact effect and improve the reliability of welding. In some embodiments, the surface of the second member 50 has an adhesive material, for example, the second member 50 may be an insulating tape.

In one embodiment, the coin cell 100 includes a first electrode that includes a second wall 112 of the coin cell 100, the second wall 112 being made of an electrically conductive material so that it can act as the first electrode of the coin cell 100. The second conductive portion 24 is pressed by the second member 50 to be tightly attached to the first electrode, so as to improve the reliability and convenience of welding between the first electrode and the second conductive portion 24.

Referring to fig. 4 and 7, fig. 7 is a perspective schematic view of another view of the button cell 100, wherein broken lines indicate structures disposed inside the casing 10. In one embodiment, at least a portion of the second member 50 is in contact with the second wall 112. When the distance that the second member 50 extends along the Y axis is greater than the distance that the second conductive portion 24 extends along the Y axis, the portion of the second member 50 that exceeds the second conductive portion 24 is connected to the second wall 112, so that the second conductive portion 24 along the Y axis can be tightly attached to the first electrode when the second member 50 presses the second conductive portion 24 during the preparation process of the button cell, thereby facilitating the connection between the second conductive portion 24 and the first electrode and improving the stability of the connection.

In an embodiment, the fourth region 2411 has a portion overlapping the second member 50, as viewed in a third direction perpendicular to the fourth region 2411. Wherein the third direction is the opposite direction of the X-axis.

As shown in fig. 7, the dashed lines indicate the electrode assembly 20 and the second member 50, and it can be observed that the portion where the second member 50 overlaps the fourth region 2411, that is, the surface of the connection region between the second conductive portion 24 and the electrode has the second member 50, so that the impact of other portions in the electrode assembly directly on the connection region can be buffered, and the connection reliability between the second conductive portion 24 and the electrode can be improved; in the process of preparing the button cell, the fourth area 2411 on the third surface 241 is better adhered to the first electrode when the second component 50 presses the second conductive part 24, so that the connection between the fourth area 2411 and the first electrode is facilitated, and the stability of the connection between the second conductive part 24 and the first electrode is improved.

In some embodiments, the second wall 112 of the first electrode is formed as a flat area, so that the second member 50 better abuts the second conductive portion 24 on the flat first electrode, and the stability of the connection between the second conductive portion 24 and the first electrode is improved.

Referring to fig. 4, in an embodiment, the second member 50 is disposed at a position farther from the first wall 111 than a center portion of the second wall 112 in a second direction perpendicular to the first wall 111. Wherein the second direction is along the Z-axis direction. The second member 50 is disposed above the center portion of the second wall 112 with respect to the center portion of the second wall 112 in the direction along the Z axis, so that the second member 50 is away from the first wall 111. Wherein the center of the second wall 112 is at a midpoint position.

The second member 50 is disposed at a position further away from the first wall 111, so that the second member 50 can better press the second adapting portion 244 in the second conductive portion 24, so as to avoid interference between the second member 50 and the stacked plurality of second metal portions 243, thereby affecting connection between the second metal portions 243 and the second adapting portion 244.

In this embodiment, the first and second members 40 and 50 are identical in structure and function. The first member 40 abuts against the first conductive portion 23, the second member 50 abuts against the second conductive portion 24, so that the first conductive portion 23 and the second electrode 30 are tightly attached to each other, and the second conductive portion 24 and the first electrode are tightly attached to each other, thereby improving the reliability of connection.

Referring to fig. 8, in an embodiment, along the Y-axis direction in fig. 8, there is a case where the length of the second member 50 is smaller than the length of the second conductive portion 24.

Referring to fig. 9 and 10, fig. 9 is a schematic perspective view of the button cell 100 with the first cover 12 removed, and fig. 9 is a schematic top view of the button cell 100 with the first cover 12 removed shown in fig. 7. It can be seen that the first and second members 40, 50 are located at opposite ends of the button cell 100.

In some embodiments, when the first member 40 and the second member 50 are both insulating foam, the insulating foam has a porous structure, so that a sufficient buffering effect can be provided, and the impact on the first conductive portion or the second conductive portion is reduced, thereby improving the reliability of connection and prolonging the service life of the button cell. The material of the insulating foam can be at least one of polypropylene (PP) and Polyurethane (PU). It is to be understood that in other embodiments, the material of the insulating foam is not limited thereto.

When the first member 40 and the second member 50 are provided, the electrode assembly 20 may be first provided in the case 10, and then the first member 40 and the second member 50 may be placed, or the first member 40, the second member 50 and the electrode assembly 20 may be assembled and then placed in the case 10.

Referring to fig. 4 again, in another embodiment, the arrangement of the first conductive portion 23 and the first member 40 is opposite to the first embodiment. Specifically, the button cell 100 includes a case 10, an electrode assembly 20, a second electrode 30, and a first member 40, and the arrangement and connection relationship between the respective structures are substantially the same as those of the button cell 100 in the first embodiment, except that: the second conductive portion 24 in the first embodiment is the first conductive portion 23 in this embodiment, and the second member 50 in the first embodiment is the first member 40 in this embodiment.

Specifically, the first member 40 is disposed at a position farther from the first wall 111 than the center portion of the second wall 112 in the second direction perpendicular to the first wall 111. Further, at least a portion of the first member 40 is in contact with the second wall 112. Wherein the second wall 112 forms a first electrode of the coin cell 100. That is, the first member 40 is disposed on the first conductive part 23, and the first conductive part 23 is connected to the second wall 112 forming the first electrode, thereby achieving electrical communication between the electrode assembly 20 and the case 10.

The first conductive portion 23 in this embodiment is the second conductive portion 24 in the first embodiment, and the first member 40 is the second member 50 in the first embodiment.

The button cell 100 further includes a second electrode 30, where the second electrode 30 is disposed at the first opening 113. The second conductive portion 24 is pressed by the second member 50 to be closely attached to the second electrode 30. In this embodiment, the second conductive portion 24 is the first conductive portion 23 in the first embodiment, and the second member 50 is the first member 40 in the first embodiment.

Referring to fig. 11 and 12, fig. 11 is a schematic perspective view of a button cell 100 according to a second embodiment of the present application, and fig. 12 is a schematic cross-sectional view of the button cell 100 shown in fig. 11 along the B-B direction. The structure of the button cell 100 in the second embodiment is substantially the same as that of the button cell 100 in the first embodiment, except that in the second embodiment, the second opening 1211 in the first cover 12 is provided at a substantially central position of the third wall 121. The second opening 1211 is provided at this position, so that the connection between the first conductive portion 23 and the first pole piece 21 is affected during the flow of the electrolyte when the electrolyte is injected into the housing 10, and the connection stability between the first conductive portion 23 and the first pole piece 21 is ensured.

In the second embodiment, the first conductive portion 23 eliminates the first transfer portion 234, the second conductive portion 24 eliminates the second transfer portion 244, the first metal portion 233 is directly pressed against the first member 40, the first metal portion 233 is welded to the second electrode 30, the second member 50 is pressed against the second metal portion 243, and the second metal portion 243 is welded to the first electrode.

In some embodiments, the first member 40 extends substantially the same distance as the first conductive portion 23 between the first member 40 and the second electrode 30, and the second member 50 extends substantially the same distance as the second conductive portion 24 between the second member 50 and the first electrode, in the Z-axis direction, wherein "substantially the same" should be understood to include the same, as well as a slight distance difference. The arrangement is such that when the first member 40 presses the first conductive portion 23 against the second electrode 30 and the second member 50 presses the second conductive portion 24 against the first electrode, the ends of the first conductive portion 23 and the second conductive portion 24 can be welded, so as to improve the influence of the extending portions of the ends of the first conductive portion 23 and the second conductive portion 24 on the welded electrode assembly 20, for example, the extending portions may drive the first conductive portion 23 and the second conductive portion 24 to move, thereby causing unstable welding.

Referring to fig. 13, fig. 13 is a schematic cross-sectional view of a button cell 100 according to a third embodiment of the present application. The structure of the button cell 100 in the third embodiment is substantially the same as that of the button cell 100 in the first embodiment, except that in the third embodiment, the first and second electrode sheets 21 and 22 included in the electrode assembly 20 are formed in a winding manner.

Referring to fig. 14 and 15, fig. 14 is a schematic perspective view of a button cell 100 according to a fourth embodiment of the present application, and fig. 15 is a schematic cross-sectional view of the button cell 100 along the C-C square shown in fig. 14. The button cell 100 of the fourth embodiment has a structure substantially identical to that of the button cell 100 of the first embodiment, except that the electrode assembly 20 has a wound structure, the second electrode 30 is disposed on the surface of the first cover 12 adjacent to the electrode assembly 20, the first conductive part 23 is connected to the second electrode 30, the first conductive part 23 is not pressed by the first member 40, but the electrode assembly 20 is fixed by the second wall 112, and the second member 50 is pressed against the second conductive part 24 so that the second conductive part 24 is closely attached to the first electrode.

A first layer 60 is disposed between the first cover 12 and the bottom shell 11, and the first layer 60 is used for sealing the first cover 12 and the bottom shell 11 from liquid, such as water, flowing into the bottom shell 11.

In some embodiments, the first layer 60 is a sealant. It will be appreciated that in other embodiments, the first layer 60 is not so limited, and may be replaced with other structures having equivalent efficacy or function.

Referring to fig. 16, fig. 16 is a perspective schematic view of the button cell 100 shown in fig. 14. The dashed line indicates the electrode assembly 20 and the second member 50, where a portion between the second member 50 and the second conductive portion 24 is overlapped, and the second conductive portion 24 is already adhered to the first electrode, so that the second conductive portion 24 is convenient to be welded to the first electrode.

Referring to fig. 17, fig. 17 is a schematic top view of the button cell 100 shown in fig. 14 with the first cover 12 removed. As in the first embodiment, in the fourth embodiment, the dimensions of the second member 50 need to be adapted to the second conductive part 24 and the main body portion of the electrode assembly 20 to ensure smooth assembly of the electrode assembly 20 into the case 10 and to ensure that the second member 50 can press against the second conductive part 24. In addition, it is desirable to reduce interference of the second member 50 during assembly of the first cover 12.

Referring to fig. 18, fig. 18 is a schematic perspective view of an electronic device 200 according to a fifth embodiment of the present disclosure. The electronic device 200 includes a body 80 and the button cell 100 described in any of the above embodiments, where the button cell 100 is accommodated in the body 80 to provide electric energy to the body 80. The electronic device 200 adopts the button cell 100 in any of the above embodiments, so that the button cell 100 has all the advantages, and will not be described herein.

In some embodiments, the electronic device 200 may be a smart wearable device, such as a bluetooth headset, and may also be a small lighting device. It is understood that the specific type of the electronic device 200 is not limited thereto and other configurations are possible.

When the electronic device 200 is a bluetooth headset, the body 80 is in a headset structure, and the button cell 100 is used for providing power to the headset. When the electronic device 200 has other structures, the body 80 is replaced accordingly.

In summary, in the button cell 100 and the electronic device 200 provided in the embodiments of the present application, the first member 40 is disposed on the second surface 232 of the first conductive portion 23, so that when the button cell is subjected to an external impact, the impact of other parts of the electrode assembly 20 on the first conductive portion 23 can be buffered, and the connection reliability between the first conductive portion 23 and the electrode can be improved; in addition, in the process of preparing the button cell, the first component 40 is positioned between the first conductive part 23 and the pressing knife, so that the pressing knife is beneficial to tightly pressing the first conductive part 23 and the electrode, the welding reliability between the first conductive part 23 and the electrode is ensured, and the damage to the pressing knife in the welding process is avoided due to the isolation effect of the first component 40. In addition, by the extrusion of the first member 40 and/or the adhesion between the first member 40 and the second wall 112, the first conductive portion 23 is tightly adhered to the first electrode, so that the shaking of the first conductive portion 23 when external impact is applied can be further suppressed, the connection reliability between the first conductive portion 23 and the electrode is improved, and in the preparation process of the button cell, the original pressing tool process can be replaced, and the convenience of welding between the electrode assembly 20 and the electrode is improved. Meanwhile, the stability of welding is ensured.

In addition, those of ordinary skill in the art will recognize that the above embodiments are presented for purposes of illustration only and are not intended to be limiting, and that suitable modifications and variations of the above embodiments are within the scope of the disclosure of the present application.

Claims

1. A button cell comprises an electrode assembly, a first electrode, a second electrode and a first component, wherein,

the electrode assembly includes a first conductive portion having a first face and a second face;

the first electrode comprises a first concave part with a first opening, the first concave part comprises a first wall and a second wall, and the electrode assembly is accommodated in the first concave part;

the second electrode is arranged at the first opening;

the first face includes a first region contiguous with the second electrode;

the first component comprises an insulating material, and comprises a first end face, and the first end face is connected with the second face; the first end surface comprises a first connecting area connected with the second surface;

the first component further comprises a second end surface opposite to the first end surface, and the second end surface is connected with the electrode assembly; the second end surface comprises a second connection region connected with the electrode assembly, and the second connection region is opposite to the first connection region along the direction from the first end surface to the second end surface;

The first opening is formed in the second wall;

the electrode assembly further includes a second conductive portion having a third face and a fourth face, the third face including a fourth region contiguous with the first electrode; the button cell further comprises a second component, wherein the second component contains an insulating material and comprises a third end face, and the third end face is connected with the fourth face; the third end face comprises a third joint area connected with the fourth face;

the second component further comprises a fourth end surface opposite to the third end surface, and the fourth end surface is connected with the electrode assembly;

the fourth end face comprises a fourth connecting region connected with the electrode assembly, and the fourth connecting region is opposite to the third connecting region along the direction from the third end face to the fourth end face;

the first member is disposed between the first conductive portion and a main body portion of the electrode assembly by interference fit; the second member is disposed between the second conductive portion and the main body portion of the electrode assembly by interference fit.

2. The button cell of claim 1, wherein the first region has a portion that coincides with the first member when viewed in a first direction perpendicular to the first region.

3. The button cell of claim 1, wherein at least a portion of the first member meets the second wall.

4. The button cell of claim 1, wherein the first face comprises a first region contiguous with the second electrode, the first member having a portion that does not overlap the first opening, as viewed in a first direction perpendicular to the first region.

5. The button cell battery of claim 1, satisfying at least one of the following conditions:

i) The first member is provided at a position farther from the first wall than a center portion of the second wall in a second direction perpendicular to the first wall;

ii) viewed in a first direction perpendicular to the first region, the first member having a portion that does not overlap the first region;

iii) At least a portion of the first member is bonded to the second wall;

iv) the button cell further comprises a first cover covering the first recess.

6. The button cell of claim 1, wherein the second wall comprises a curved second region and a flat third region, the first opening being provided in the third region.

7. The button cell of claim 1, wherein the fourth region has a portion that coincides with the second member, as viewed in a third direction perpendicular to the fourth region.

8. The button cell of claim 1, wherein at least a portion of the second member meets the second wall.

9. The button cell battery of claim 1, satisfying at least one of the following conditions:

a) The second member has a portion that does not overlap with the fourth region, as viewed in a third direction perpendicular to the fourth region;

b) At least a portion of the second member is bonded to the second wall;

c) The second member is disposed at a position farther from the first wall than a center portion of the second wall in a second direction perpendicular to the first wall.

10. The button cell of claim 1, wherein the second conductive portion is connected to the second wall.

11. The button cell of claim 1, wherein the first conductive portion and the second conductive portion are located on opposite sides of the electrode assembly.

12. An electronic device comprising the button cell of any one of claims 1 to 11.