CN114069115A

CN114069115A - Button cell

Info

Publication number: CN114069115A
Application number: CN202111524359.5A
Authority: CN
Inventors: 曹志锋; 胡江波; 李东亮; 李红军
Original assignee: Shenzhen Heyi New Energy Technology Co ltd
Current assignee: Shenzhen Heyi New Energy Technology Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-02-18

Abstract

The invention discloses a button battery, which comprises a shell assembly and an electric core assembly, wherein the shell assembly comprises a shell, a cover plate and a polar plate, the cover plate is electrically connected with the shell and covers the shell to form an electric core cavity, the cover plate is provided with a matching through hole, and the polar plate covers or fills the matching through hole and is arranged on the cover plate in an insulating way; the electric core component comprises a first pole piece and a second pole piece, wherein the first pole piece and the second pole piece are arranged in an insulating mode and wound to form a winding core structure, the first pole piece is electrically connected with the pole plates, and the second pole piece is electrically connected with the shell or the cover plate. The cover plate is electrically connected with the shell to be used as a shell of one pole, the polar plate is used as a shell of the other pole, the polar plate and the cover plate are in insulation fit to avoid short circuit, the first polar plate is electrically connected with the polar plate, and the second polar plate is electrically connected with the shell or the cover plate to be conducted; compare the mode that traditional apron and shell insulation set up, the polar plate is changeed through the cooperation through-hole and is realized reliable insulating cooperation with the apron to guarantee button cell's performance and safety.

Description

Button cell

Technical Field

The invention relates to the technical field of button batteries, 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 box hat, upper cover and electric core subassembly, and the upper cover lid is established and is formed the electricity core chamber on the box hat, and the electricity core subassembly is established at the electricity core intracavity.

Since insulation is required between the upper cover and the steel can, an insulating ring is usually provided between the upper cover and the steel can to insulate and seal between the edges of the steel can and the upper cover. However, this structure tends to cause poor insulation and sealing effects, which may cause short-circuiting between the upper cover and the steel can, which may affect the performance and safety of the button cell.

Disclosure of Invention

Based on this, there is a need to provide a button cell; the button cell reduces the insulation difficulty of the positive and negative electrode shells, and ensures the performance and safety of the button cell.

The technical scheme is as follows:

one embodiment provides a button cell, comprising:

the shell assembly comprises a shell, a cover plate and a polar plate, wherein the cover plate is electrically connected with the shell and covers the shell to form a core cavity, the cover plate is provided with a matching through hole, and the polar plate covers or fills the matching through hole and is arranged on the cover plate in an insulating manner;

the battery core assembly, the battery core assembly establishes the electricity core intracavity, the battery core assembly includes first pole piece and second pole piece, first pole piece with insulating setting and the coiling form roll core structure between the second pole piece, first pole piece with polar plate electric connection, the second pole piece with shell or/and apron electric connection.

In the button cell, the cover plate is electrically connected with the shell to be used as a shell of one pole, the cover plate is provided with a matching through hole to install the polar plate, the polar plate is used as a shell of the other pole, the polar plate and the cover plate are in insulating matching to avoid short circuit, the first polar plate is electrically connected with the polar plate, and the second polar plate is electrically connected with the shell or the cover plate to be conducted; compare the mode that traditional apron and shell insulation set up, the polar plate is changeed through the cooperation through-hole and is realized reliable insulating cooperation with the apron to guarantee button cell's performance and safety.

The technical solution is further explained below:

in one embodiment, the housing assembly further includes an insulating ring, an outer ring of the insulating ring has an annular groove, the insulating ring is sleeved on the cover plate through the annular groove, a groove wall of the annular groove is in abutting fit with an edge of the fitting through hole, and the pole plate is in insulating fit with the cover plate through the insulating ring.

In one embodiment, the polar plate is fixed with the insulating ring, and the polar plate is positioned on one side of the insulating ring far away from the shell; the first pole piece penetrates through the inner ring of the insulating ring and is electrically connected with the pole plate.

In one embodiment, the pole plate has a main body portion and a connecting portion, the main body portion is fixed to the insulating ring, at least a portion of the main body portion is located in an inner ring of the insulating ring, the connecting portion is located on a side of the insulating ring facing the housing, and the first pole piece is electrically connected to the connecting portion.

In one embodiment, the pole plate is anchored on the cover plate, so that the pole plate is formed with a stressed portion, the stressed portion is located on one side of the insulating ring far away from the shell, and the stressed portion and the connecting portion are respectively located on two opposite sides of the main body portion.

In one embodiment, the projected outline of the outer edge of the pole plate is positioned within the projected outline of the outer edge of the insulating ring when projected along the winding axis direction of the winding core structure, and the projected outline of the outer edge of the pole plate and the projected outline of the outer edge of the insulating ring have a preset distance.

In one of them embodiment, the shell has diapire and lateral wall, the lateral wall is cyclic annular setting and establishes on the diapire, keeping away from of lateral wall the one end of diapire is equipped with the annular channel, the annular channel is the ladder groove and sets up the internal face of lateral wall, the outward flange of apron with the annular channel corresponds, the apron passes through the cell wall of annular channel with the shell welding.

In one embodiment, the portion of the side wall corresponding to the opening position of the annular groove is a welding wall, the welding wall is provided with a bending part and a straight welding part which are both annularly arranged, the bending part is obtained by bending one end of the welding wall far away from the bottom wall towards the inner side of the side wall, and the straight welding part is connected with the bending part and is positioned on one side of the welding wall towards the bottom wall;

the end face of the cover plate is welded with the straight welding part, and the side face, far away from the bottom wall, of the cover plate is welded with the bending part.

In one of the embodiments, the height of the welding wall is no greater than 1/5 the height of the side wall; the thickness of the welding wall is 1/6 to 1/3 of the thickness of the side wall.

In one embodiment, the core assembly further comprises a membrane disposed between the first and second pole pieces;

at least one first tab is led out of the first pole piece and is electrically connected with the pole plate;

at least one second tab is led out of the second pole piece, and the second tab is electrically connected with the shell.

Drawings

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

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 invention;

FIG. 2 is a sectional view showing the overall structure of a button cell in one embodiment;

FIG. 3 is an exploded view of the cover plate, pole plate and insulating collar of the embodiment of FIG. 2;

FIG. 4 is a sectional view of the embodiment of FIG. 3, assembled without riveting the plates;

FIG. 5 is an assembly view of the cover plate, pole plate and insulator ring of the embodiment of FIG. 2;

FIG. 6 is a cross-sectional view of the embodiment of FIG. 5 with the plates riveted to the cover plate;

FIG. 7 is a sectional view showing the overall structure of a button cell in another embodiment;

FIG. 8 is an assembly view of the cover plate, pole plate and insulator ring of the embodiment of FIG. 7;

FIG. 9 is a cross-sectional view of the cover plate, pole plate and insulator ring of the embodiment of FIG. 8;

FIG. 10 is a schematic view of a welding structure of the welding wall and the cover plate in the embodiment;

FIG. 11 is a schematic view showing the overall structure of the casing in the embodiment;

FIG. 12 is a cross-sectional structural view of the housing in the embodiment of FIG. 11;

FIG. 13 is a schematic view of a first electric core assembly in the embodiment;

FIG. 14 is a schematic view of a second electric core assembly according to an embodiment;

FIG. 15 is a schematic view of a third core assembly according to an embodiment;

FIG. 16 is a schematic view of a fourth core assembly according to an embodiment;

fig. 17 is a schematic view of a fifth electric core assembly in the embodiment.

Reference is made to the accompanying drawings in which:

110. a housing; 111. a bottom wall; 112. a side wall; 1121. an annular groove; 1122. welding the wall; 1122a, a bending part; 1122b, a straight welding part; 120. a cover plate; 130. a polar plate; 131. a main body portion; 132. a connecting portion; 133. a force receiving portion; 140. an insulating ring; 200. a roll core structure; 210. a first tab; 220. and a second tab.

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 comprehensible, embodiments accompanied with 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, 2 and 7, one embodiment provides a button cell, which includes a housing assembly and a cell assembly. Wherein:

as shown in fig. 2 and 7, the housing assembly includes a housing 110, a cover plate 120, and a pole plate 130, wherein the cover plate 120 is electrically connected to the housing 110 and covers the housing 110 to form a core cavity, the cover plate 120 is provided with a through hole, and the pole plate 130 covers or fills the through hole and is insulated from the cover plate 120.

In the conventional housing structure, the housing 110 and the cover plate 120 are sealed and insulated by a rubber ring, and the outer edge of the cover plate 120 is pressed against the rubber ring by a pressing force to seal and insulate the housing 110. However, in the installation process, due to reasons such as insufficient abutting force, the shell 110 and the cover plate 120 are easily conducted, and then a short circuit is caused, which affects the use safety and performance of the button battery.

As shown in fig. 2 and fig. 7, the embodiment eliminates the structure of the conventional cover plate 120 that needs to be insulated from the housing 110, so that the cover plate 120 and the housing 110 are electrically connected to serve as a housing of one pole, and the cover plate 120 is provided with a matching through hole to mount a housing of another pole, that is, the pole plate 130 serves as a housing of another pole.

As shown in fig. 13 to 17, the cell assembly is disposed in the cell cavity, the cell assembly includes a first pole piece and a second pole piece, the first pole piece and the second pole piece are disposed in an insulating manner and wound to form a winding core structure 200, the first pole piece is electrically connected to the pole plate 130, and the second pole piece is electrically connected to the housing 110 or/and the cover plate 120.

One of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece.

If the positive plate is electrically connected to the polar plate 130, the polar plate 130 serves as a positive casing, the negative plate is electrically connected to the casing 110 or the cover plate 120, and the casing 110 and the cover plate 120 serve as a negative casing.

If the positive electrode tab is electrically connected to the housing 110 or the cover plate 120, the housing 110 and the cover plate 120 serve as a positive electrode case, the negative electrode tab is electrically connected to the electrode plate 130, and the electrode plate 130 serves as a negative electrode case.

In the button cell, the cover plate 120 is electrically connected with the shell 110 to serve as a shell of one pole, the cover plate 120 is provided with a matching through hole to mount the pole plate 130, the pole plate 130 serves as a shell of the other pole, the pole plate 130 and the cover plate 120 are in insulating matching to avoid short circuit, the first pole piece is electrically connected with the pole plate 130, and the second pole piece is electrically connected with the shell 110 or the cover plate 120 to be conducted; compared with the traditional mode that the cover plate 120 and the shell 110 are arranged in an insulating mode, the pole plate 130 is easier to realize reliable insulating matching with the cover plate 120 through the matching through hole, and therefore the performance and the safety of the button cell are guaranteed.

In one embodiment, referring to fig. 2 and fig. 7, the housing assembly further includes an insulating ring 140, an outer ring of the insulating ring 140 has an annular groove 1121, the insulating ring 140 is sleeved on the cover plate 120 through the annular groove 1121, a groove wall of the annular groove 1121 is abutted and matched with an edge of the matching through hole, and the pole plate 130 is in insulating fit with the cover plate 120 through the insulating ring 140.

As shown in fig. 2 and 7, the outer ring of the insulating ring 140 has an annular groove 1121, and a notch of the annular groove 1121 is disposed corresponding to the cover plate 120, so that the insulating ring 140 is engaged with the cover plate 120 through the annular groove 1121, and the pole plate 130 is fixed to the insulating ring 140 and insulated from the cover plate 120 through the insulating ring 140.

Optionally, the housing 110 and the cover plate 120 are both circular, the matching through hole is a circular through hole formed in the cover plate 120, the insulating ring 140 is circular, and the insulating ring 140 is engaged with the cover plate 120 through the annular groove 1121. The plate 130 can be fixed to the insulating ring 140 in at least two ways as shown in fig. 2 and 7, and the plate 130 is insulated from the cover plate 120.

In one embodiment, referring to fig. 7 to 9, the pole plate 130 is fixed to the insulating ring 140, and the pole plate 130 is located on a side of the insulating ring 140 away from the housing 110; the first pole piece passes through the inner ring of the insulating ring 140 and is electrically connected with the pole plate 130.

In the embodiment shown in fig. 8, the plate 130 is arranged in a circular shape, and the diameter of the plate 130 is smaller than the outer diameter of the insulating ring 140, so that the outer edge of the plate 130 does not contact with the cover plate 120, thereby achieving reliable insulation.

As shown in the cross-sectional view of fig. 9, the plate 130 is located on the upper side of the cover plate 120, i.e. on the side of the cover plate 120 away from the housing 110 or on the side of the insulating ring 140 away from the housing 110, and the plate 130 is fixed to the upper surface of the insulating ring 140, since the diameter of the plate 130 is smaller than the outer diameter of the insulating ring 140, and the hole wall portions of the matching through holes of the cover plate 120 are separated by the insulating ring 140, the plate 130 and the cover plate 120 are reliably insulated.

Alternatively, the plate 130 is fixed to the insulating ring 140 by bonding or heat fusion.

In one embodiment, referring to fig. 2 to 6, the pole plate 130 has a main body portion 131 and a connecting portion 132, the main body portion 131 is fixed to the insulating ring 140, at least a portion of the main body portion 131 is located in an inner ring of the insulating ring 140, the connecting portion 132 is located on a side of the insulating ring 140 facing the housing 110, and the first pole piece is electrically connected to the connecting portion 132.

As shown in fig. 3 and 4, the plate 130 includes a main body 131 and a connecting portion 132, the main body 131 is disposed in a cylindrical shape, the connecting portion 132 is disposed at a lower end of the main body 131 in a cylindrical or disc shape, the connecting portion 132 and the main body 131 are coaxially disposed, and the diameter of the main body 131 is equal to or comparable to the inner ring diameter of the insulating ring 140.

As shown in fig. 4, the main portion 131 of the plate 130 is located in the inner ring of the insulating ring 140, the connecting portion 132 is located at the lower side of the cover plate 120 and located in the cell cavity, and the first plate is electrically connected to the connecting portion 132. The first pole piece and the connecting portion 132 may be electrically connected by welding or the like.

As shown in fig. 4, the upper portion of the body 131 extends beyond the upper surface of the insulating ring 140.

As shown in fig. 4, the diameter of the connecting portion 132 is larger than that of the main body portion 131, and the diameter of the connecting portion 132 is smaller than the outer ring diameter of the insulating ring 140, so that on one hand, the upper surface of the connecting portion 132 is tightly attached to the lower surface of the insulating ring 140 to position the plate 130, and on the other hand, the connecting portion 132 does not contact the cover plate 120, thereby ensuring the insulating fit between the plate 130 and the cover plate 120.

In one embodiment, referring to fig. 3 to 6, the pole plate 130 is anchored on the cover plate 120, so that the pole plate 130 is formed with a force-bearing portion 133, the force-bearing portion 133 is located on a side of the insulating ring 140 away from the housing 110, and the force-bearing portion 133 and the connecting portion 132 are respectively located on two opposite sides of the main body portion 131.

Fig. 4 is a sectional view showing the structure of the plate 130, the insulating ring 140, and the cap plate 120 when the plate 130 is not anchored, and fig. 6 is a sectional view showing the structure in which the plate 130 is anchored to the cap plate 120 after a force is applied to the upper surface of the plate 130.

As shown in fig. 4, the upper end of the main body 131 of the plate 130 protrudes above the insulating ring 140 more, and the force-receiving portion 133 is not formed. As can be seen from fig. 6, after the anchoring force is applied to the upper end of the main body 131 of the plate 130, the upper end of the main body 131 compresses downward to form the force-receiving portion 133, the height of the main body 131 decreases to form the force-receiving portion 133, and the lower surface of the force-receiving portion 133 abuts against the upper surface of the insulating ring 140, so that the plate 130 is reliably fixed in the insulating ring 140, and the plate 130 and the cover plate 120 are reliably coupled in an insulating manner.

It can be understood that:

the outer edge of the stress part 133 formed after the upper end of the main body part 131 is stressed is still in the range of the outer ring of the insulating ring 140, so that the stress part 133 anchoring the rear pole plate 130 is not contacted with the cover plate 120, and the possibility of short circuit is avoided. Therefore, this places dimensional requirements on the outer diameter of the outer circle of the insulator ring 140.

Alternatively, the cover plate 120 and the base plate are insulated and matched to form an upper cover in a conventional structure, and the cover plate 120 and the base plate can be assembled in advance. During production, the electric core assembly is placed in the outer shell 110, then liquid injection is performed, after the liquid injection is completed, an upper cover formed by the cover plate 120 and the substrate is covered on the outer shell 110, and the electric connection between the cover plate 120 and the outer shell 110 is completed. Compare the tradition and need set up notes liquid hole and need weld upper cover and shell 110 earlier on covering, later annotate the operation of liquid, annotate liquid efficiency higher, and need not to set up and annotate the liquid hole.

In addition, the pole plate 130 and the cover plate 120 are insulated by the insulating ring 140, and the pole plate 130 is fixed by the anchoring of fig. 2 or the bonding of fig. 7, so that compared with the conventional welding mode, the problems of poor battery performance, unstable performance and the like caused by unstable welding and the like are solved.

In one embodiment, referring to fig. 5 and 8, when projected along the winding axis direction of the winding core structure 200, the projected contour of the outer edge of the plate 130 is located within the projected contour of the outer edge of the insulating ring 140, and there is a predetermined distance between the projected contour of the outer edge of the plate 130 and the projected contour of the outer edge of the insulating ring 140.

As shown in fig. 5 and 8 in combination with fig. 1, 2 and 7, the winding axis direction of the core structure 200 is perpendicular to the plane of the cover plate 120, that is, the winding axis direction of the core structure 200 can be simply understood as the direction of a straight line perpendicular to the plane of the cover plate 120. The projected contour of the outer edge of the plate 130 is always located inside the projected contour of the outer edge of the insulating ring 140, so that the outer edge of the plate 130 is always hard to contact the cap plate 120, thereby ensuring insulation between the plate 130 and the cap plate 120.

Optionally, the preset distance between the outer edge of the plate 130 and the outer edge of the insulating ring 140 is above 1 mm.

For example, if the pole plate 130 and the insulating ring 140 are both circular, the diameter of the pole plate 130 is smaller than the outer ring diameter of the insulating ring 140 by at least 1mm, and details thereof are not repeated.

In one embodiment, referring to fig. 11 and 12, the housing 110 has a bottom wall 111 and a side wall 112, the side wall 112 is annularly disposed on the bottom wall 111, an annular groove 1121 is disposed at an end of the side wall 112 away from the bottom wall 111, the annular groove 1121 is a stepped groove and is disposed on an inner wall surface of the side wall 112, an outer edge of the cover plate 120 corresponds to the annular groove 1121, and the cover plate 120 is welded to the housing 110 through a groove wall of the annular groove 1121.

As shown in the sectional structure of the housing 110 shown in fig. 12, it can be seen that the groove bottom of the annular groove 1121 corresponds to the formation of a support portion. As shown in fig. 10, the supporting portion is in interference fit with the lower surface of the cover plate 120 to support the cover plate 120. The outer edge of the cover plate 120 is welded to the groove wall of the annular groove 1121, so that the electrical connection between the cover plate 120 and the housing 110 is achieved.

Alternatively, the outer shell 110 may be a steel shell, with the bottom wall 111 and the side wall 112 being integrally formed.

In an embodiment, referring to fig. 10 to 12, a portion of the side wall 112 corresponding to an opening position of the annular groove 1121 is a welding wall 1122, the welding wall 1122 has a bent portion 1122a and a straight welding portion 1122b both arranged in a ring shape, the bent portion 1122a is obtained by bending one end of the welding wall 1122 away from the bottom wall 111 toward an inner side of the side wall 112, and the straight welding portion 1122b is connected to the bent portion 1122a and is located on one side of the welding wall 1122 toward the bottom wall 111.

As shown in fig. 10, an end surface of the cover plate 120 is welded to the straight welded portion 1122b, and a side surface of the cover plate 120 away from the bottom wall 111 is welded to the bent portion 1122 a.

In the embodiment shown in fig. 12, the annular groove 1121 is opened, so that the region of the side wall 112 corresponding to the annular groove 1121 is thinner, and the region is the welding wall 1122.

In the embodiment shown in fig. 10, the welding wall 1122 is divided into two parts, one part is a bent part 1122a formed by bending the upper end of the welding wall 1122 toward the inside of the housing 110, the welding wall 1122 is actually in an annular wall structure, so the bent part 1122a is also in an annular structure, the lower surface of the bent part 1122a is welded to the upper surface of the edge position of the cover plate 120, and the welding can be completed by laser welding or the like through a plurality of welding points; the other part is a lower half part of the welding wall 1122, and a part connecting the bent part 1122a and the non-open annular groove 1121 of the side wall 112, that is, the straight welding part 1122b in fig. 10, the straight welding part 1122b directly corresponds to the end surface of the cover plate 120, and is directly welded to the end surface of the cover plate 120 by laser welding or the like without bending.

Because the bent portion 1122a and the straight welding portion 1122b are welded by welding points, compared with a traditional structure in which the shell 110 and the upper cover are in insulating contact, the problem of fire explosion caused by residual electrolyte on the wall surface of the shell 110 is avoided.

In one embodiment, referring to fig. 12, the height of the welding wall 1122 is not greater than 1/5, which is the height of the side wall 112.

In one embodiment, the thickness of the welding wall 1122 is 1/6-1/3 of the thickness of the side wall 112.

It can be understood that:

the height of welding wall 1122 is appropriate, and the thickness of welding wall 1122 is not too thin, so that the structural reliability of case 110 can be ensured.

In one embodiment, the core assembly further comprises a membrane disposed between the first and second pole pieces.

In one embodiment, referring to fig. 13 to 17, at least one first tab 210 is led out of the first pole piece, and the first tab 210 is electrically connected to the pole plate 130.

In one embodiment, referring to fig. 13 to 17, at least one second tab 220 is led out from the second tab, and the second tab 220 is electrically connected to the housing 110.

The number of the first tab 210 and the second tab 220 in the core assembly can be determined according to actual conditions. As shown in fig. 13, in the core assembly, there is one of the first tab 210 and the second tab 220; as shown in fig. 14, in the core assembly, there are one first tab 210 and two second tabs 220; in the core assembly shown in fig. 15, there are one first tab 210 and three second tabs 220; as shown in fig. 16, in the core assembly, there are two first tabs 210 and two second tabs 220; as shown in fig. 17, the core assembly has two first tabs 210 and three second tabs 220.

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 invention 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 invention.

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 implicitly indicating 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 otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate 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 invention. 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 shall be subject to the appended claims.

Claims

1. A button cell, comprising:

2. The button cell according to claim 1, wherein the housing assembly further comprises an insulating ring, an outer ring of the insulating ring has an annular groove, the insulating ring is sleeved on the cover plate through the annular groove, a groove wall of the annular groove is in abutting fit with an edge of the fitting through hole, and the pole plate is in insulating fit with the cover plate through the insulating ring.

3. The button cell according to claim 2, wherein the pole plate is fixed with the insulating ring, and the pole plate is positioned on one side of the insulating ring away from the shell; the first pole piece penetrates through the inner ring of the insulating ring and is electrically connected with the pole plate.

4. The button cell according to claim 2, wherein the pole plate has a main body portion and a connecting portion, the main body portion is fixed to the insulating ring, at least a portion of the main body portion is located in an inner ring of the insulating ring, the connecting portion is located on a side of the insulating ring facing the housing, and the first pole piece is electrically connected to the connecting portion.

5. The button cell according to claim 4, wherein the pole plate is anchored to the cover plate, such that the pole plate is formed with a force-receiving portion, the force-receiving portion is located on a side of the insulating ring away from the housing, and the force-receiving portion and the connecting portion are located on two opposite sides of the main body portion.

6. The button cell according to claim 2, wherein the projected contour of the outer edge of the plate when projected in the winding axis direction of the winding core structure is located inside the projected contour of the outer edge of the insulating ring, and the projected contour of the outer edge of the plate and the projected contour of the outer edge of the insulating ring have a preset distance therebetween.

7. The button cell according to any one of claims 1 to 6, wherein the housing has a bottom wall and a side wall, the side wall is disposed in an annular shape and is disposed on the bottom wall, an annular groove is disposed at an end of the side wall away from the bottom wall, the annular groove is a stepped groove and is disposed on an inner wall surface of the side wall, an outer edge of the cover plate corresponds to the annular groove, and the cover plate is welded to the housing through a groove wall of the annular groove.

8. The button cell according to claim 7, wherein the portion of the side wall corresponding to the opening position of the annular groove is a welding wall, the welding wall has a bending portion and a straight welding portion, the bending portion and the straight welding portion are both annularly arranged, the bending portion is obtained by bending one end of the welding wall away from the bottom wall towards the inner side of the side wall, and the straight welding portion is connected with the bending portion and located on one side of the welding wall towards the bottom wall;

9. The button cell of claim 8, wherein the height of the weld wall is no greater than 1/5 the height of the side wall; the thickness of the welding wall is 1/6 to 1/3 of the thickness of the side wall.

10. The button cell of claim 7 wherein the core assembly further comprises a separator disposed between the first and second pole pieces;