CN216928724U - Button cell - Google Patents

Abstract

The utility model discloses a button battery, which comprises a shell assembly and a battery assembly, wherein the shell assembly comprises a bottom shell, an upper cover and an insulating ring, the upper cover is covered on the bottom shell and forms an accommodating cavity, and the insulating ring is positioned between the bottom shell and the upper cover; the electric core component is located and holds the intracavity, and the electric core component has first utmost point ear and second utmost point ear, first utmost point ear and upper cover electric connection, and at least partly of second utmost point ear supports and presses between drain pan and insulating circle to make second utmost point ear and drain pan electric connection. Insulating ring makes casing and upper cover insulating and form and holds the chamber, and the electric core subassembly is established and is holding the intracavity, and first utmost point ear and second utmost point ear are drawn forth to the electric core subassembly, and first utmost point ear and upper cover electric connection can regard as the negative pole, and at least some clamp of second utmost point ear is established between insulating ring and drain pan to make second utmost point ear and drain pan tightly contradict through the mode that supports pressing, not only make to connect more reliably, can improve the contact surface through the mode of establishing of pressing from both sides moreover, reduce the internal resistance of contact between second utmost point ear and the drain pan.

Description

Button cell

Technical Field

The utility model relates to the technical field of battery manufacturing, in particular to a button battery.

Background

Button cells, also commonly referred to as Button cells, refer to a type of battery that resembles a Button in shape. Button cells are typically relatively larger in diameter and relatively thinner in thickness. Button cell includes casing and electric core subassembly, and the casing includes drain pan and upper cover, and drain pan and upper cover insulation cooperation form and hold the chamber, and electric core subassembly is installed and is being held the intracavity.

The battery pack assembly is provided with a positive tab and a negative tab, the positive tab is welded with the bottom shell, the negative tab is welded with the upper cover, and the battery pack assembly is usually welded by laser welding, spot welding or ultrasonic welding. However, this structure makes it difficult to ensure reliable welding, resulting in a large contact internal resistance.

SUMMERY OF THE UTILITY MODEL

Based on this, there is a need to provide a button cell; this button cell carries out the electric connection of utmost point ear and drain pan through the mode of butt, compares traditional welding mode, not only connects more reliably, can reduce moreover because the contact internal resistance great problem that the contact is not enough to lead to.

The technical scheme is as follows:

one embodiment provides a button cell, comprising:

the shell assembly comprises a bottom shell, an upper cover and an insulating ring, the upper cover is covered on the bottom shell and forms an accommodating cavity, and the insulating ring is positioned between the bottom shell and the upper cover;

the electric core assembly, the electric core assembly is located hold the intracavity, the electric core assembly has first utmost point ear and second utmost point ear, first utmost point ear with upper cover electric connection, at least some of second utmost point ear support press in the drain pan with between the insulating circle, so that the second utmost point ear with drain pan electric connection.

Above-mentioned button cell, insulating ring makes casing and upper cover insulating and form and holds the chamber, electric core subassembly is established and is holding the intracavity, first utmost point ear and second utmost point ear are drawn forth to electric core subassembly, first utmost point ear and upper cover electric connection can regard as the negative pole, at least some clamp of second utmost point ear is established between insulating ring and drain pan, thereby make second utmost point ear and drain pan tightly contradict through the mode that supports to press, not only make to connect more reliably, and can improve the contact surface through the mode of establishing of pressing from both sides, reduce the internal resistance of contact between second utmost point ear and the drain pan.

The technical solution is further explained below:

in one embodiment, the bottom case has a bottom wall, a side wall, and a fitting wall, the side wall and the fitting wall are both annularly disposed, one end of the side wall is connected to the bottom wall, the other end of the side wall is connected to the fitting wall, the fitting wall is in insulation fit with the upper cover through the insulating ring to form the accommodating cavity, and at least a portion of the second tab is pressed between the fitting wall and the insulating ring.

In one embodiment, the matching wall has a first abutting wall, a second abutting wall and a third abutting wall which are all annularly arranged, the second abutting wall is connected between the first abutting wall and the third abutting wall to form an abutting groove, and the outer edge of the upper cover abuts against and presses the insulating ring in the abutting groove; the first abutting wall is connected between the side wall and the second abutting wall, and at least one part of the second tab abuts against and is pressed between the first abutting wall and the insulating ring.

In one embodiment, the first abutting wall extends from the side wall to the outer annular side of the side wall, the second abutting wall extends from the first abutting wall to the side far away from the bottom wall, the third abutting wall extends to the inner annular side of the side wall, and the first abutting wall and the third abutting wall are respectively positioned at two opposite sides of the outer edge of the upper cover; the second pole lug is provided with a butting part which is butted between the first butting wall and the insulating ring.

In one embodiment, the cell body includes a first pole piece, a second pole piece, and an isolator, the isolator is disposed between the first pole piece and the second pole piece, one end of the first tab is connected to the first pole piece and located on one side of the cell body facing the upper cover, one end of the second tab is connected to the second pole piece and located on one side of the cell body facing the bottom wall, and the abutting portion is disposed at the other end of the second tab.

In one embodiment, the middle part of the second tab extends along the side wall towards one side of the upper cover, and the abutting part extends towards the outer ring side of the side wall.

In one embodiment, the second electrode tab includes a tab body and a tab abutting body, one end of the tab body is electrically connected to the second electrode plate and located on one side of the battery cell body facing the bottom wall, the other end of the tab body is electrically connected to the tab abutting body, and the tab abutting body has the abutting portion.

In one embodiment, the tab abutting body includes a connecting portion, an extending portion, and an abutting portion, the connecting portion is electrically connected to the other end of the tab body and is located on one side of the battery cell body facing the bottom wall, the extending portion is connected to the connecting portion and is located between the side portion of the battery cell body and the side wall, the extending portion extends toward one side of the upper cover, and the abutting portion extends toward the outer ring side of the side wall.

In one embodiment, the upper cover is arranged in a circular shape, the insulating ring and the matching wall are arranged corresponding to the upper cover, the abutting portion is an abutting sheet, and the abutting sheet is provided with an arc-shaped edge corresponding to the insulating ring.

In one embodiment, the first tab is made of nickel or copper or nickel-copper alloy; or/and the second tab is made of nickel or copper or nickel-copper alloy.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Furthermore, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements in the drawings are drawn only by way of example, and not necessarily to true scale.

Fig. 1 is a schematic view of the overall structure of a button cell in the embodiment of the utility model;

FIG. 2 is a structural cross-sectional view of a button cell in one embodiment;

FIG. 3 is an enlarged view of a portion of the abutment, the first abutment wall and the insulating collar of the embodiment of FIG. 2;

FIG. 4 is a cross-sectional view of the structure of the embodiment of FIG. 2 when the mating wall is not mated with the upper cover;

FIG. 5 is an enlarged partial assembled cross-sectional view of the abutment and mating wall of the embodiment of FIG. 4;

FIG. 6 is a sectional view showing the structure of a button cell in another embodiment;

FIG. 7 is an enlarged, partially assembled, cross-sectional view of the abutment and mating wall of the embodiment of FIG. 6;

fig. 8 is a first perspective view of the tab engaging member assembled with the electric core assembly in the embodiment of fig. 6;

fig. 9 is a second perspective view of the tab engaging member assembled with the electric core assembly in the embodiment of fig. 6;

fig. 10 is an assembly view of the tab abutment and core assembly of the embodiment of fig. 6 with the insulating ring removed;

fig. 11 is a schematic view of the overall structure of the tab abutting body in the embodiment of fig. 6.

Reference is made to the accompanying drawings in which:

110. a bottom case; 111. a bottom wall, 112, a side wall; 113. a mating wall; 1131. a first abutment wall; 1132. a second abutment wall; 1133. a third abutment wall; 1134. a butt joint groove; 120. an upper cover; 130. an insulating ring; 140. an accommodating chamber; 200. an electrical core assembly; 210. a first tab; 220. a second tab; 221. a tab body; 222. a tab abutting body; 2221. a connecting portion; 2222. an extension portion; 2223. an abutting portion; 2224. and (4) an arc-shaped edge.

Detailed Description

Embodiments of the present invention are described in detail below with reference to the accompanying drawings:

in order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 to 5, one embodiment provides a button cell, which includes a housing assembly and a cell assembly 200. Wherein:

as shown in fig. 1, 2 and 4, the housing assembly includes a bottom housing 110, an upper cover 120, and an insulating ring 130, the upper cover 120 is covered on the bottom housing 110 and forms a receiving cavity 140, and the insulating ring 130 is located between the bottom housing 110 and the upper cover 120.

In the embodiment shown in fig. 1, the bottom case 110 may be a circular steel case, and the upper cover 120 may be a circular cover corresponding to the bottom case 110.

Alternatively, the insulating ring 130 may be a sealing ring, and the insulating ring 130 is disposed between the bottom case 110 and the upper cover 120 to seal and insulate between the bottom case 110 and the upper cover 120.

As shown in fig. 2 to 5, the electric core assembly 200 is located in the accommodating cavity 140, the electric core assembly 200 has a first tab 210 and a second tab 220, the first tab 210 is electrically connected to the upper cover 120, and at least a portion of the second tab 220 is pressed between the bottom shell 110 and the insulating ring 130, so that the second tab 220 is electrically connected to the bottom shell 110.

This button cell, insulating ring 130 makes casing and upper cover 120 insulating and form and hold chamber 140, electric core subassembly 200 is established in holding chamber 140, electric core subassembly 200 draws out first utmost point ear 210 and second utmost point ear 220, first utmost point ear 210 and upper cover 120 electric connection, can regard as the negative pole, at least some clamp of second utmost point ear 220 is established between insulating ring 130 and drain pan 110, thereby make second utmost point ear 220 tightly contradict with drain pan 110 through the mode of pressing, not only make to connect more reliable, and can improve the contact surface through the mode of establishing of pressing from both sides, reduce the internal resistance of contact between second utmost point ear 220 and the drain pan 110.

As shown in fig. 3, since the insulating ring 130 is located between the bottom case 110 and the upper cover 120, the insulating ring 130 is pressed by the bottom case 110 and the upper cover 120 to achieve sealing, and thus a pressing force between the insulating ring 130 and the bottom case 110 is sufficiently large. Compared with the structure of the traditional welding mode, the end part of the second pole lug 220 is clamped between the insulating ring 130 and the bottom shell 110, so that the reliable contact between the second pole lug 220 and the bottom shell 110 is ensured through enough large extrusion acting force, and meanwhile, the surface contact can be realized due to the extrusion action, so that the problem of large contact internal resistance between the second pole lug 220 and the bottom shell 110 caused by insufficient contact is solved; in addition, the problems that more space in the accommodating cavity 140 needs to be occupied, welding points are torn and the like during welding are avoided.

In one embodiment, referring to fig. 2 to 5, the bottom housing 110 has a bottom wall, a side wall and a matching wall 113, the side wall and the matching wall 113 are both annularly disposed, one end of the side wall is connected to the bottom wall, the other end of the side wall is connected to the matching wall 113, the matching wall 113 is in insulation fit with the upper cover 120 through the insulating ring 130 to form the accommodating cavity 140, and at least a portion of the second tab 220 is pressed between the matching wall 113 and the insulating ring 130.

As shown in fig. 3 and 4 and known from fig. 1, the bottom wall, the side wall and the mating wall 113 may be integrally formed, and the mating wall 113 is bent to abut against the outer edge of the upper cover 120 and is engaged with the insulating ring 130 for sealing and insulating.

In one embodiment, referring to fig. 3, the matching wall 113 has a first abutting wall 1131, a second abutting wall 1132 and a third abutting wall 1133 which are all annularly arranged, the second abutting wall 1132 is connected between the first abutting wall 1131 and the third abutting wall 1133 to form an abutting groove 1134, and the outer edge of the upper cover 120 presses the insulating ring 130 against the abutting groove 1134.

In one embodiment, referring to fig. 3, the first abutting wall 1131 is connected between the side wall and the second abutting wall 1132, and at least a portion of the second tab 220 is pressed between the first abutting wall 1131 and the insulating ring 130.

In the embodiment shown in fig. 3, the first abutment wall 1131, the second abutment wall 1132 and the third abutment wall 1133 cooperate to form an abutment groove 1134, the notch of the abutment groove 1134 faces the inner side of the annular fitting wall 113 to cooperate with the outer edge of the upper cover 120, and the insulating ring 130 is pressed against the abutment groove 1134 by the outer edge of the upper cover 120 to achieve an insulating function.

In the embodiment shown in fig. 3, the end of the second pole ear 220 is pressed between the first abutment wall 1131 and the insulating ring 130, so that the end of the second pole ear 220 is dead-pressed on the first abutment wall 1131 by the insulating ring 130, and the second pole ear 220 is electrically connected to the bottom case 110.

In one embodiment, referring to fig. 3, the first abutment wall 1131 extends from the side wall toward the outer ring side of the side wall, the second abutment wall 1132 extends from the first abutment wall 1131 toward the side away from the bottom wall, the third abutment wall 1133 extends toward the inner ring side of the side wall, and the first abutment wall 1131 and the third abutment wall 1133 are respectively located at two opposite sides of the outer edge of the upper cover 120.

As shown in fig. 3 and 5, the first abutment wall 1131 of the fitting wall 113 extends toward the left (i.e., the outer ring side of the side wall or the outer ring side of the bottom housing 110), and the end of the second pole ear 220 abuts against and fits with the upper wall surface of the first abutment wall 1131. As in the perspective shown in fig. 5, the second abutment wall 1132 and the third abutment wall 1133 are both disposed vertically, and at this time, the upper cover 120 is not yet assembled with the bottom cover 110; as shown in fig. 3, the third abutment wall 1133 extends towards the right side (i.e. the inner ring side of the side wall or the inner ring side of the bottom shell 110), and at this time, the first abutment wall 1131, the second abutment wall 1132 and the third abutment wall 1133 cooperate to form the abutment groove 1134, it can be understood that, since the first abutment wall 1131, the second abutment wall 1132 and the third abutment wall 1133 are all annular, the abutment groove 1134 is also an annular groove corresponding to the outer edge of the upper cover 120, so that the outer edge of the upper cover 120 is covered with the bottom shell 110 through the abutment groove 1134 and is sealed and insulated by the insulating ring 130.

In one embodiment, referring to fig. 3, the second pole ear 220 has an abutting portion 2223, and the abutting portion 2223 is pressed between the first abutting wall 1131 and the insulating ring 130.

As shown in fig. 3, in the embodiment, the abutting portion 2223 is disposed at the end of the second pole ear 220, and the abutting portion 2223 is sandwiched between the first abutting wall 1131 and the insulating ring 130, so that the abutting portion 2223 and the first abutting wall 1131 are fully contacted and electrically connected, thereby achieving the electrical connection between the second pole ear 220 and the bottom case 110.

In one embodiment, the cell body includes a first pole piece, a second pole piece, and a separator, the separator is disposed between the first pole piece and the second pole piece, one end of the first tab 210 is connected to the first pole piece and located on one side of the cell body facing the upper cover 120, one end of the second tab 220 is connected to the second pole piece and located on one side of the cell body facing the bottom wall, and the abutting portion 2223 is disposed at the other end of the second tab 220.

Optionally, the first pole piece may be a negative pole piece, the second pole piece is a positive pole piece, the first pole piece and the second pole piece are isolated by an isolator, and the first pole piece and the second pole piece are wound to form a winding core, that is, the cell body.

The first tab 210 may be a leading-out portion of a first pole piece, or may be a separately arranged first tab 210, so that the first tab 210 is electrically connected (for example, connected by conductive adhesive or welded) with a leading-out end of the first pole piece, thereby making the first tab 210 a negative tab; similarly, the second tab 220 may be a lead-out portion of the second pole piece, or may be a separately disposed second tab 220, such that the second tab 220 is electrically connected with a lead-out end of the second pole piece (for example, may be connected by a conductive adhesive or welded), so as to make the second tab 220 a positive tab.

Since the second tab 220 is located on the side of the cell body facing the bottom wall, and a part of the second tab 220 needs to be pressed against the position of the insulation fit between the bottom case 110 and the upper cover 120, the second tab 220 needs to reach the position of the insulation ring 130 of the insulation fit between the bottom case 110 and the upper cover 120, which provides two ways:

in one embodiment, referring to fig. 2 and 4, the middle portion of the second tab 220 extends along the side wall toward one side of the upper cover 120, and the abutting portion 2223 extends toward the outer ring side of the side wall.

As shown in fig. 2 and 4, the second tab 220 is drawn out from the lower side of the cell body, extends along the side wall toward the upper side until reaching a position corresponding to the first abutment wall 1131, and then extends toward the left side of the first abutment wall 1131 to form an abutment portion 2223, and the abutment portion 2223 abuts against the upper surface of the first abutment wall 1131.

In this case, the second tab 220 may be a part of the second tab, which is directly led out from the second tab and extends along the side wall toward the position of the first abutment wall 1131, and finally abuts between the first abutment wall 1131 and the insulating ring 130.

In another embodiment, referring to fig. 6 to 10, the second tab 220 includes a tab body 221 and a tab abutting body 222, one end of the tab body 221 is electrically connected to the second tab and located on one side of the cell body facing the bottom wall, the other end of the tab body 221 is electrically connected to the tab abutting body 222, and the tab abutting body 222 has the abutting portion 2223.

In the embodiment shown in fig. 6 and 8, the tab body 221 is directly led out from the second pole piece or the tab body 221 is separately disposed and electrically connected to the lead-out end of the second pole piece, the tab abutting body 222 is connected to the tab body 221, and the abutting portion 2223 is disposed on the tab abutting body 222, so that the abutting portion 2223 abuts against and is pressed between the first abutting wall 1131 and the insulating ring 130.

It should be noted that:

the tab body 221 and the tab abutting body 222 are made of conductive material.

In one embodiment, referring to fig. 8 to 11, the tab abutting body 222 includes a connecting portion 2221, an extending portion 2222, and an abutting portion 2223, the connecting portion 2221 is electrically connected to the other end of the tab body 221 and is located on one side of the cell body facing the bottom wall, the extending portion 2222 is connected to the connecting portion 2221 and is located between the side portion of the cell body and the side wall, the extending portion 2222 extends toward one side of the upper cover 120, and the abutting portion 2223 extends toward the outer ring side of the side wall.

In the embodiment shown in fig. 11, the connecting portion 2221, the extending portion 2222 and the abutting portion 2223 are all provided in a sheet shape, the connecting portion 2221 can be connected to the tab body 221 by welding, the extending portion 2222 extends along the side portion of the side wall, and the abutting portion 2223 extends toward the first abutting wall 1131, so that the abutting portion 2223 can be interposed between the first abutting wall 1131 and the insulating ring 130.

In one embodiment, referring to fig. 11, the upper cover 120 is circular, the insulating ring 130 and the matching wall 113 are both disposed corresponding to the upper cover 120, and the abutting portion 2223 is an abutting piece having an arc-shaped edge 2224 corresponding to the insulating ring 130.

In the embodiment shown in fig. 11, the abutting portion 2223 is a plate-like structure, and since the abutting portion 2223 is compressed between the first abutting wall 1131 and the insulating ring 130, for better fitting, the edge of the abutting portion 2223 has an arc-shaped edge 2224 to fit with the arc-shaped edge of the insulating ring 130 and the edge of the first abutting wall 1131, and to avoid interference.

It should be noted that:

since the abutting portion 2223 is provided in a sheet shape, the abutting portion 2223 is tightly pressed between the first abutting wall 1131 and the insulating ring 130, so that the contact reliability between the second pole piece 220 and the bottom case 110 is further greatly increased, and the increase of the contact area greatly reduces the contact internal resistance between the second pole piece 220 and the bottom case 110.

In addition, the extending portion 2222 is disposed in a sheet shape, and more or less contact will inevitably exist between the extending portion 2222 and the side wall, so that the contact area between the second tab 220 and the bottom case 110 is further increased, and the contact internal resistance between the second tab 220 and the bottom case 110 is reduced.

Since the extension portion 2222 is located between the sidewall and the outer side of the cell body, the outer ring side of the cell body should be the second pole piece to avoid the second pole piece 220 from contacting the first pole piece, which is not described in detail.

In one embodiment, the first tab 210 is made of nickel or copper or nickel-copper alloy.

In one embodiment, the second tab 220 is made of nickel or copper or nickel-copper alloy.

The material of the second tab 220, particularly the abutting portion 2223, may be nickel (Ni), copper (Cu), or nickel-copper (NiCu), and the thickness thereof is controlled to be 10 μm or less. The purpose of this is: since the abutting portion 2223 needs to be compressed between the first abutting wall 1131 and the insulating ring 130, on one hand, the abutting portion 2223 needs to have certain compressive strength and anti-breaking capability, and on the other hand, the abutting portion needs not to be too thick, and therefore, nickel (Ni) or copper (Cu) or nickel-copper alloy (NiCu) is selected to meet the requirement of abutting.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (10)

1. A button cell, comprising:

the shell assembly comprises a bottom shell, an upper cover and an insulating ring, the upper cover is covered on the bottom shell and forms an accommodating cavity, and the insulating ring is positioned between the bottom shell and the upper cover;

the electric core assembly, the electric core assembly is located hold the intracavity, the electric core assembly has first utmost point ear and second utmost point ear, first utmost point ear with upper cover electric connection, at least some of second utmost point ear support press in the drain pan with between the insulating circle, so that the second utmost point ear with drain pan electric connection.

2. The button cell according to claim 1, wherein the bottom case has a bottom wall, a side wall, and a mating wall, the side wall and the mating wall are both arranged in a ring shape, one end of the side wall is connected to the bottom wall, the other end of the side wall is connected to the mating wall, the mating wall is in insulation fit with the upper cover through the insulating ring to form the accommodating cavity, and at least a portion of the second tab is pressed between the mating wall and the insulating ring.

3. The button cell according to claim 2, wherein the mating wall has a first abutting wall, a second abutting wall and a third abutting wall, all of which are annularly arranged, the second abutting wall is connected between the first abutting wall and the third abutting wall to form an abutting groove, and the outer edge of the upper cover abuts against the insulating ring against the abutting groove; the first abutting wall is connected between the side wall and the second abutting wall, and at least one part of the second tab abuts against and is pressed between the first abutting wall and the insulating ring.

4. The button cell according to claim 3, wherein the first abutting wall extends from the side wall toward an outer circumferential side of the side wall, the second abutting wall extends from the first abutting wall toward a side away from the bottom wall, the third abutting wall extends toward an inner circumferential side of the side wall, and the first abutting wall and the third abutting wall are respectively located on opposite sides of an outer edge of the upper cover; the second pole lug is provided with a butting part which is butted between the first butting wall and the insulating ring.

5. The button cell according to claim 4, wherein the cell body includes a first pole piece, a second pole piece, and an isolator, the isolator is disposed between the first pole piece and the second pole piece, one end of the first tab is connected to the first pole piece and is located on a side of the cell body facing the upper cover, one end of the second tab is connected to the second pole piece and is located on a side of the cell body facing the bottom wall, and the abutting portion is disposed at the other end of the second tab.

6. The button cell according to claim 5, wherein the middle portion of the second tab extends along the side wall toward one side of the upper cover, and the abutting portion extends toward the outer circumferential side of the side wall.

7. The button cell according to claim 5, wherein the second tab comprises a tab body and a tab abutting body, one end of the tab body is electrically connected to the second tab and located on one side of the cell body facing the bottom wall, the other end of the tab body is electrically connected to the tab abutting body, and the tab abutting body has the abutting portion.

8. The button battery according to claim 7, wherein the tab abutting body includes a connecting portion, an extending portion, and an abutting portion, the connecting portion is electrically connected to the other end of the tab body and located on one side of the cell body facing the bottom wall, the extending portion is connected to the connecting portion and located between the side portion of the cell body and the side wall, the extending portion extends toward one side of the upper cover, and the abutting portion extends toward the outer ring side of the side wall.

9. The button cell according to any one of claims 4 to 8, wherein the upper cover is arranged in a circular shape, the insulating ring and the mating wall are arranged corresponding to the upper cover, and the abutting portion is an abutting piece having an arc-shaped edge corresponding to the insulating ring.

10. The button battery according to any one of claims 1-8, wherein the first tab is made of nickel or copper or nickel-copper alloy; or/and the second tab is made of nickel or copper or nickel-copper alloy.

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