CN217086817U

CN217086817U - Button cell and electronic equipment

Info

Publication number: CN217086817U
Application number: CN202220245576.4U
Authority: CN
Inventors: 陈志勇
Original assignee: Guangdong Mic Power New Energy Co Ltd
Current assignee: Guangdong Mic Power New Energy Co Ltd
Priority date: 2022-01-25
Filing date: 2022-01-29
Publication date: 2022-07-29
Anticipated expiration: 2032-01-29
Also published as: CN114744377A

Abstract

The utility model relates to a button cell and electronic equipment, button cell includes: a housing comprising a first half shell and a second half shell; the first half shell comprises a first end surface and a first side wall arranged around the first end surface; the second half shell comprises a second end face and a second side wall arranged around the second end face; the second side wall is sleeved on the outer side of the first side wall, and an insulating sealing ring is arranged between the first side wall and the second side wall; the winding core is arranged in the shell and is of a winding structure, two end faces of the winding core are respectively opposite to the first end face and the second end face, and two tabs are arranged on the winding core; at least one of the first end surface and the second end surface is provided with a protruding structure and is connected with a corresponding tab through the protruding structure, and the protruding structure protrudes towards the inner side of the shell.

Description

Button cell and electronic equipment

Technical Field

The utility model relates to a battery technology field, more specifically, the utility model relates to a button cell and electronic equipment.

Background

Button cells are widely used due to their small size, large capacity and good consistency. In the process of assembling the button cell, the shell and the lug need to be welded so as to meet the purpose that the shell is electrically connected with the winding core to form an electrode. In the related art, when the tab is welded with the shell, the tab is not easy to position, so that the shell and the tab are not welded or are welded infirm.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a button cell and electronic equipment's new technical scheme.

According to the utility model discloses a first aspect provides a button cell, button cell includes:

a housing comprising a first half shell and a second half shell;

the first half shell comprises a first end surface and a first side wall arranged around the first end surface;

the second half shell comprises a second end face and a second side wall disposed around the second end face;

the second side wall is sleeved on the outer side of the first side wall, and an insulating sealing ring is arranged between the first side wall and the second side wall;

the winding core is arranged in the shell and is of a winding structure, two end faces of the winding core are respectively opposite to the first end face and the second end face, and two tabs are arranged on the winding core;

at least one of the first end surface and the second end surface is provided with a protruding structure and is connected with the corresponding tab through the protruding structure, and the protruding structure protrudes towards the inner side of the shell.

Optionally, the middle part of the winding core is provided with a through hole, and at least part of the protruding structure is positioned in the through hole.

Optionally, in a radial direction of the through hole, a size of the protrusion structure is smaller than or equal to a size of the through hole.

Optionally, the middle part of the winding core is provided with a through hole, and a projection of the protruding structure on the end face of the winding core at least partially covers the through hole.

Optionally, the protrusion structure is a spherical protrusion, an annular protrusion, a strip-shaped protrusion, a radial protrusion, or the top of the protrusion structure is a planar structure.

Optionally, a core column is arranged in the through hole, and the core column is abutted against the electrode lug; or

The through hole is internally provided with a core column, an axial cavity is arranged in the core column, the core column is abutted against the lug, and at least part of the protruding structure is positioned in the axial cavity.

Optionally, at least one of the tabs is connected with the inner wall of the through hole.

Optionally, the height of the protrusion structure protruding towards the inner side of the shell is greater than or equal to 0.05 mm.

Optionally, the tab is provided with a caulking groove, the protruding structure is arranged in the caulking groove, and the top of the protruding structure is in contact with the bottom of the caulking groove.

Optionally, the tab includes a first portion and a second portion connected to the first portion, the first portion being connected to the winding core, one of the second portions of the tab being located the end face of the winding core with between the first end faces and connected to the first end faces, the second portion of the other tab being located the end face of the winding core with between the second end faces and connected to the second end faces.

Optionally, the first end face and the tab or the second end face and the tab are welded by a double-needle welding head.

Optionally, at least one of the first and second half shells is of integrally formed construction.

Optionally, the first end face or the second end face is provided with a plurality of the convex structures.

Optionally, a recessed structure is provided outside the first end face or the second end face and at a position corresponding to the plurality of raised structures, and welding is applied from the recessed structure.

Optionally, the plurality of protruding structures include a first protruding structure and a second protruding structure, and the first protruding structure and the second protruding structure are symmetrically arranged with respect to the center of the first end surface or the center of the second end surface.

Optionally, a double-needle welding head is used for welding at the recessed structures corresponding to the positions of the first raised structure and the second raised structure, and the two welding heads correspond to the two recessed structures one by one.

Optionally, a recessed structure is configured at a position outside the first end surface or the second end surface and opposite to the protruding structure.

Optionally, the protruding structure is an annular protrusion, and an annular groove is configured on the outer side of the first end face or the second end face and opposite to the annular protrusion.

Optionally, at least two welding points are formed on the annular protrusion.

Optionally, the tab and the annular protrusion are welded together using a two-pin welding head, which is applied in the annular groove.

Optionally, the width of the recessed structure gradually increases from the bottom to the open end of the recessed structure.

Optionally, the protruding structure is located at a position of the first end face or the second end face opposite to the through hole in the middle of the winding core.

Optionally, one of the two tabs is connected to the positive electrode of the winding core, the other tab is connected to the negative electrode of the winding core, the second end surface is provided with the protruding structure, one tab is connected to the protruding structure, and the other tab is connected to the first side wall.

Optionally, the two tabs extend from the same end face of the winding core; or one of the tabs extends out from one end face of the winding core, and the other tab extends out from the other end face of the winding core.

Optionally, the first side wall includes a first portion connected to the first end face and a second portion connected to the first portion, the second portion projecting radially outward relative to the first portion, a tab connected to the side wall being connected to the second portion.

Optionally, the second side wall is curled inwardly at the junction of the first portion and the second portion.

According to a second aspect of the present invention, there is provided an electronic device comprising a button cell as defined in any one of the first aspect.

The utility model has the advantages of, the setting makes utmost point ear be connected with the terminal surface at place through this protruding structure to the inboard convex protruding structure of casing. The protruding structure protruding towards the inside of the shell can be in close contact with the pole lug, so that the pole lug and the shell are more easily in contact and positioned, and the shell can be effectively connected with the pole lug by ensuring welding.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is one of the schematic structural diagrams of a button cell according to an embodiment of the present disclosure.

Fig. 2 is one of schematic cross-sectional structural diagrams of a button cell according to an embodiment of the present disclosure.

Fig. 3 is a second schematic cross-sectional view of a button cell according to an embodiment of the disclosure.

Fig. 4 is a third schematic cross-sectional view of a button cell according to an embodiment of the disclosure.

Fig. 5 is a fourth schematic cross-sectional view of a button cell according to an embodiment of the disclosure.

Fig. 6 is a schematic structural view of the button cell corresponding to fig. 5.

Fig. 7 is a fifth schematic sectional view of a button cell according to an embodiment of the disclosure.

Fig. 8 is a schematic structural diagram of the button cell corresponding to fig. 7.

Fig. 9 is a sixth schematic sectional view of a button cell according to an embodiment of the present disclosure.

Fig. 10 is a seventh cross-sectional structural schematic diagram of a button cell according to an embodiment of the disclosure.

Description of reference numerals:

11. a first end face; 12. a first side wall; 121. a first portion; 122. a second portion; 123. a connecting portion; 21. a second end face; 22. a second side wall; 3. an insulating seal ring; 4. a raised structure; 41. A first bump structure; 42. a second bump structure; 43. an annular projection; 44. a central bulge; 45. An annular groove; 46. a first recess structure; 47. a second recessed structure; 5. a winding core; 50. a through hole; 51. a stem; 52. an axial cavity; 6. a first tab; 61. a first connection portion; 62. a second connecting portion; 7. a second tab; 71. a third connecting portion; 72. a fourth connecting portion; 8. caulking grooves; 9. a horn.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to one embodiment of the present disclosure, a button cell is provided. As shown in fig. 1 to 4, the button cell includes:

the shell is provided with two shell end faces and a side wall arranged between the two shell end faces. The side wall is annular. The two housing end faces are connected with the side walls to enclose an accommodating space inside the housing. The shape of the housing may be a rectangular parallelepiped, a cylinder, or the like. For example, one of the two case end faces functions as a battery positive electrode, and the other functions as a battery negative electrode.

In one example, the housing includes a first half shell and a second half shell. The first half shell comprises a first end surface 11 and a first side wall 12 arranged around the first end surface 11. The second half shell includes a second end face 21 and a second side wall 22 disposed about the second end face 21. The second side wall 22 is sleeved on the outer side of the first side wall 12, and an insulating sealing ring 3 is arranged between the first side wall 12 and the second side wall 22.

In other examples, the first half shell includes a shell end face and a sidewall connected to the shell end face. The second half shell is a cap. The first half shell is a structure with one end open and the other end closed. A cap covers the open end of the first half shell. The cap serves as the other housing end face. An insulating sealing member is arranged between the cap and the first half shell.

Of course, the structure of the housing is not limited to the above-mentioned embodiments, and those skilled in the art can set the configuration according to actual needs.

Roll up core 5, roll up core 5 and locate inside the casing, roll up core 5 and be winding structure, two terminal surfaces that roll up core 5 are relative with first terminal surface 11 and second terminal surface 21 respectively, it is provided with two utmost points ears on core 5 to roll up.

For example, as shown in fig. 1-8, one of the tabs is connected to the first end face 11 and the other tab is connected 21 to the second end face; as shown in fig. 9 to 10, one tab may be connected to the first end surface 11 or the second end surface 21, and the other tab may be connected to the first side wall 12 or the second side wall 22.

For example, at least one of the first end surface 11 and the second end surface 21 is provided with a protruding structure 4 and is connected with the corresponding tab through the protruding structure 4, and the protruding structure 4 protrudes towards the inner side of the housing. The raised structure 4 protrudes towards the inside of the housing, forming a depression on the outside of the housing.

In this embodiment, a protruding structure 4 protruding toward the inside of the housing is provided, so that the tab is connected to the end surface through the protruding structure 4. The convex structure 4 protruding towards the inside of the shell can be in close contact with the pole lug, so that the pole lug and the shell are more easily in contact and location, and the shell can be effectively connected with the pole lug by ensuring welding.

The pole ear is connected with the shell through the bulge structure 4, so that the winding core 5 is conducted with the shell through the bulge structure 4. Under button cell operating condition, the current transmits through protruding structure 4 between utmost point ear and the casing, avoids utmost point ear and the regional contact outside protruding structure 4 on the casing to switch on, avoids shunting.

For example, one end of the tab is led out by the winding core 5, and part of the structure of the tab is overlapped with the bulge structure 4 to form contact. The protruding structure 4 supports the pole lug, so that the other end of the pole lug is suspended, and a gap is formed between the other end of the pole lug and the shell, so that shunting caused by contact with the shell is avoided.

Optionally, the two tabs include a first tab 6 and a second tab 7, the first tab 6 is connected to the first end surface 11, and the second tab 7 is connected to the second end surface 21.

The first end face 11 and the second end face 21 serve as two electrodes which can be externally connected with the button cell. The first tab 6 is connected to the winding core 5 such that the first end surface 11 forms one electrode. The second tab 7 is connected to the winding core 5 such that the second end face 21 forms the other electrode. For example, the first tab 6 is a positive tab, and the second tab 7 is a negative tab.

At least one of the first end surface 11 and the second end surface 21 is provided with a protruding structure 4, the protruding structure 4 protrudes towards the inner side of the shell and is in contact with the tab, the gap between the shell and the tab is eliminated, the effectiveness of the tab in contact with the shell is guaranteed, the situation that the shell and the tab are out of work in welding is avoided, and the effectiveness and the firmness of the connection between the tab and the shell are guaranteed.

Optionally, the first end face 11 and the second end face 21 are each provided with a protruding structure 4.

In one embodiment, the height of the protrusion 4 protruding towards the inner side of the housing is greater than or equal to 0.05 mm.

In this embodiment, the height of the protruding structure 4 is greater than or equal to 0.05mm, so that the protruding structure 4 can be effectively contacted with the tab, and the situation of insufficient soldering between the casing and the tab is further avoided.

In one embodiment, at least one of the first and second half shells is an integrally formed structure.

The first end face 11 and the first side wall 12 are of an integrally molded structure to form a first half-shell. The second end surface 21 and the second side wall 22 are integrally formed to form a second half-shell. The second half shell is sleeved on the outer side of the first half shell to form a shell of the button cell. The insulating sealing ring 3 plays the role of insulating sealing between the first side wall 12 and the second side wall 22.

In one embodiment, the first end surface 11 and the second end surface 21 are connected with the tab by welding. After the casing, the winding core 5 and the tabs of the button cell are assembled, the tabs are connected to the casing by welding on the outside of the casing.

For example, the welding may be laser welding, resistance welding, or ultrasonic welding.

Alternatively, as shown in fig. 4, one of the two-pin horn 9 is shown. The first end face 11 and the pole lug or the second end face 21 and the pole lug are welded through a double-needle welding head, and when welding is conducted, at least one of the double-needle welding heads abuts against the protruding structure 4 from the outer side of the shell on the end face, provided with the protruding structure 4, of the first end face 11 and the second end face 21.

In one embodiment, as shown in fig. 2-4, the core 5 has a through hole 50 in the middle, and at least part of the protruding structure 4 is located in the through hole 50.

In this embodiment, at least part of the structure of the protruding structure 4 is located in the through hole 50, so that the protruding structure 4 can be prevented from being extruded with the roll core 5, the protruding structure 4 is prevented from occupying the space of the roll core 5, and the capacity of the roll core 5 is ensured. This embodiment has avoided protruding structure 4 to occupy the space of rolling up core 5 under the prerequisite that has ensured utmost point ear and casing can weld firmly, has increased button cell's capacity.

At least a part of the structure of the projection structure 4 is located in the through hole 50, which means that at least a part of the structure of the portion of the projection structure 4 projecting toward the inside of the case is located in the through hole 50. A part of the structure of the projection structure 4 may pass through the opening of the through hole 50, or the whole structure of the projection structure 4 may pass through the opening of the through hole 50.

Optionally, the protruding structure 4 on the first end surface 11 protrudes from the first end surface 11 into the through hole 50. The convex structures 4 on the second end surface 21 protrude from the second end surface 21 into the through holes 50.

Alternatively, the protruding structure 4 and the through hole 50 may be coaxially disposed, or the axis of the protruding structure 4 and the axis of the through hole 50 may be offset.

In one embodiment, the size of the protruding structure 4 is smaller than or equal to the size of the through hole 50 in the radial direction of the through hole 50.

In this embodiment, the through hole 50 has a larger radial dimension than the protruding structure 4, so that the protruding structure 4 in the structure of the button cell can be prevented from contacting and abutting with the hole opening or the hole wall of the through hole 50.

For example, the projection structure 4 is coaxially disposed with the through hole 50, the projection structure 4 is in contact with the tab, and the projection structure 4 is smaller in size in the radial direction. When the distance between the end face of the shell and the roll core 5 is smaller than the distance that the protruding structure 4 extends towards the inner side, partial structure of the protruding structure 4 can be contained in the through hole 50, the edge of the protruding structure 4 is prevented from being abutted against the end face of the roll core 5, and structural damage is avoided.

In one embodiment, the core 5 has a through hole 50 in the middle, and the projection of the protruding structure 4 on the end face of the core 5 at least partially covers the through hole 50.

In this embodiment the tab is led out to the end face of the reeling core 5 and between the projection 4 and the end face. The raised structure 4 contacts and presses against the tab. The projection of the convex structure 4 on the end surface of the winding core 5 at least partially covers the through hole 50, and the convex structure 4 is positioned outside the through hole 50, so that at least part of the convex structure 4 covers the through hole 50. The lug is clamped by the end surfaces of the protruding structures 4 and the winding core 5, so that the protruding structures 4 are effectively contacted with the lug.

In one embodiment, as shown in fig. 1, 2, 4, the protrusion structure 4 is a spherical protrusion.

The convex structure 4 protrudes towards the inner side of the shell to form a spherical structure, and the spherical structure is in contact with the pole lug. In the welding process, welding is carried out at the vertex position of the spherical structure. The vertex position of spherical structure contacts with utmost point ear, has ensured the fastness of welding.

For example, the apex of the projection structure 4 on the first end surface 11 contacts the first tab 6, and the projection structure 4 on the first end surface 11 is connected to the first tab 6 by welding at the apex position of the projection structure 4. Likewise, the relief structures 4 on the second end face 21 are connected to the second pole lugs 7.

Alternatively, in the case of welding by means of a double-needle horn, one of the horns 9 is in contact with the raised structure 4, the other horn 9 may be in contact with an edge region of the raised structure 4, or the other horn 9 may be in contact with a region of the peripheral side of the raised structure 4.

In one embodiment, as shown in fig. 3, the top of the raised structure 4 is a planar structure.

In the embodiment, the top of the protruding structure 4 is a plane structure, a larger contact surface can be formed at the position where the protruding structure 4 contacts with the tab, and the contact area of the tab and the protruding structure 4 is increased. This can provide a larger welding area for welding. For example, the flat structure on the top of the protruding structure 4 is contacted with the tab, and the flat structure on the top of the protruding structure 4 is welded, so that the protruding structure 4 is connected with the tab.

For example, the top of the protruding structure 4 on the first end surface 11 is a planar structure, the protruding structure 4 protrudes towards the inner side of the casing to contact with the first tab 6, and the plane of the top of the protruding structure 4 contacts with the surface of the first tab 6 to form a contact surface. During the welding on the outside of the first end surface 11, the lug structure 4 is connected to the first tab 6 by welding on the outside of the top of the lug structure 4. The top of the protruding structure 4 is of a plane structure, so that a more welding point can be formed, the firm degree of connection between the protruding structure 4 and the first tab 6 is improved, and the problem that the tab is not connected with the shell is avoided. Likewise, the tops of the raised structures 4 on the second end face 21 are connected to the second pole ears 7.

The convex structure can also be annular convex, strip-shaped convex or radial convex. The annular bulge can be in a circular ring shape, a rectangular ring shape, an elliptical ring shape and the like. The strip-shaped bulges can be in a linear strip shape, a wave strip shape, an arc strip shape and the like. The radial projection means that the projection is in a shape radiating from the center to the edge of the end face of the housing. Alternatively, when welding by means of a double needle horn, one of the horns 9 is in contact with the central region of the planar structure on top of the raised structure 4, and the other horn 9 is in contact with the edge region of the planar structure on top.

Alternatively, the raised structures 4 may also be cylindrical structures, for example, cylindrical or prismatic structures.

In one embodiment, a core column 51 is disposed in the through hole 50, and the core column 51 abuts against the electrode tabs.

The core column 51 plays a supporting role for the pole lug, and the core column 51 is propped against the pole lug to clamp the pole lug between the core column 51 and the shell, so that the first end face and the second end face of the shell are ensured to be in close contact with the pole lug. The firmness of the welding of the shell and the pole lug is further improved, and the condition of insufficient welding between the shell and the pole lug is avoided. For example, the raised structure 4 forms a clamp with the stem 51 to the tab, enabling the raised structure 4 to be effectively welded with the tab.

Or, a core column 51 is arranged in the through hole 50, an axial cavity 52 is arranged in the core column 51, the core column 51 abuts against the electrode tabs, and at least part of the protruding structure 4 is located in the axial cavity 52.

The axial cavity 52 in the stem 51 forms a tubular structure. The core column 51 plays a supporting role for the pole lug, and the end surface of the core column 51 is propped against the pole lug. The lug is pressed by the convex structure 4 and deformed towards the core column 51 side. The part of the tab overlying the raised formation 4 is in intimate contact with the raised formation 4. The end of the tube wall of the core post 51 supports the tab, and the protruding structure 4 and at least a part of the tab enter the axial cavity 52, and the axial cavity 52 provides a space for accommodating the protruding structure 4 and the tab.

For example, the raised structure 4 on the first end surface 11 presses part of the structure of the first tab 6 into the axial cavity 52 of the core column 51, and the end of the tube wall of the core column 51 forms a support for the first tab 6. The raised structures 4 on the second end face 21 press part of the structure of the second pole ear 7 into the axial cavity 52 of the stem 51, and the end of the tube wall of the stem 51 forms a support for the second pole ear 7.

In one embodiment, as shown in fig. 2-4, the tab is provided with a caulking groove 8, the protruding structure 4 is arranged in the caulking groove 8, and the top of the protruding structure 4 is in contact with the bottom of the caulking groove 8.

In this embodiment, the structure of the caulking groove 8 on the tab is formed by being recessed from the outer side of the case to the inner side where the winding core 5 is located. The protruding structure 4 protrudes from the housing to the inner side, so that the protruding structure 4 is matched with the caulking groove 8. The bottom of the caulking groove 8 is contacted with the top of the protruding structure 4, so that the contact area of the protruding structure 4 and the pole lug can be increased. This provides a larger area for welding, making welding easier.

For example, the caulking groove 8 has the same structure as the protruding structure 4, and the caulking groove 8 forms a protruding structure with a larger volume towards the center direction of the winding core 5, so that the tab forms a groove on the side facing the housing, and the protruding structure 4 can be more easily arranged in the caulking groove 8.

For example, the protruding structure 4 on the first end surface 11 is located in the insertion groove 8 on the first tab 6, part of the structure of the insertion groove 8 on the first tab 6 is located in the axial cavity 52, and the end of the tube wall of the core column 51 supports the insertion groove 8 on the first tab 6. The convex structure 4 on the second end face 21 is positioned in the caulking groove 8 on the second pole lug 7, part of the structure of the caulking groove 8 on the second pole lug 7 is positioned in the axial cavity 52, and the end part of the tube wall of the core column 51 supports the caulking groove 8 on the second pole lug 7.

Optionally, the shell and the pole ear are welded by spot-bottom welding or double-pin resistance welding.

For example, spot welding is performed on the outer side of the projection structure 4 by spot-bottom welding, so that the projection structure 4 is connected with the tab. The projection 4 is recessed from the outside of the housing to the inside, which makes it easier to perform the tack welding.

For example, with two-pin resistance welding, the raised structure 4 provides a location for welding when welding from the outside of the housing after assembly, with a first horn 9 positioned in the center of the raised structure 4 and the other horn welding to the periphery of the location. In the structure of assembling the button cell, the protruding structure 4 is in contact with the tab, so that tight contact can be formed, and welding is facilitated.

In one embodiment, as shown in fig. 3 and 4, at least one of the tabs is connected to the inner wall of the through hole 50.

The pole lugs are led out from the inner wall of the through hole 50 and connected with the shell, so that the volume occupied by the pole lugs is reduced, and the pole lug material is saved.

For example, the first tab 6 is connected to the inner wall of the through hole 50 and led out to the side of the first end surface 11, so that the first tab 6 is connected to the protruding structure 4 on the first end surface 11. Likewise, the second tab 7 can also be connected to the inner wall of the through hole 50 and lead out to the side of the second end face 21.

Alternatively, the two tabs are connected to positions other than the inner wall of the through hole 50. For example, the tab is connected to the side wall of the winding core 5. The tab may be connected to one of the pole pieces located on a different layer in the wound structure of the jelly roll 5.

The pole ear can also be arranged outside the winding core 5 for connection. The tab is extended to the end face of the winding core 5 to be connected to the case.

In one embodiment, as shown in fig. 2-4, the tab includes a first portion connected to the winding core 5 and a second portion connected to the first portion, the second portion of one tab is located between the end surface of the winding core 5 and the first end surface 11 and connected to the first end surface 11, and the second portion of the other tab is located between the end surface of the winding core 5 and the second end surface 21 and connected to the second end surface 21.

Alternatively, the first tab 6 includes a first connection portion 61 and a second connection portion 62 connected to the first connection portion 61. The first portion is a first connecting portion 61, the first connecting portion 61 is connected to the winding core 5, the second portion is a second connecting portion 62, and the second connecting portion 62 is connected to the first end surface 11. The second connection portion 62 is connected to the first end face 11 through the projection structure 4.

For example, the second connection portion 62 is located between the end surface of the winding core 5 and the first end surface 11, and the projection structure 4 on the first end surface 11 is in contact with the second connection portion 62 and welded. For example, the second connecting portion 62 is provided with a caulking groove 8, and the projection structure 4 extends into the caulking groove 8.

Alternatively, the second tab 7 includes a third connection portion 71 and a fourth connection portion 72 connected to the third connection portion 71. The first portion is a third connecting portion 71, the third connecting portion 71 is connected to the core 5, and the fourth connecting portion 72 is connected to the second end surface 21. The fourth portion is a fourth connecting portion 72, and the fourth connecting portion 72 is connected to the second end face 21 through the protruding structure 4.

For example, the fourth connecting portion 72 is laid between the end face of the winding core 5 and the second end face 21, and the projection structures 4 on the second end face 21 are contacted and welded with the fourth connecting portion 72. For example, the fourth connecting portion 72 is provided with a caulking groove 8, and the projection structure 4 extends into the caulking groove 8.

In one example, the first end surface 11 or the second end surface 21 is partially formed into an uneven surface by providing a plurality of convex structures or the convex structures 4 having a set shape. Such a surface makes the positioning of the tab more accurate.

In a specific example, the first end surface 11 or the second end surface 21 is provided with a plurality of the convex structures 4. The lug can be effectively supported by the plurality of protruding structures 4, so that the lug is more accurately positioned, the lug is more firmly contacted with the shell, and the electric connection is favorably formed. For example, as shown in fig. 5 to 6, a plurality of the projection structures 4 are each located at a central portion of the second end surface 21 and at positions corresponding to the through holes 50 of the core 5. Welding is carried out at this position, and the welding spot can be avoided from damaging the winding core 5.

In one example, as shown in fig. 5 to 6, a concave structure is provided at a position outside the first end surface 11 or the second end surface 21 and corresponding to the plurality of convex structures 4. A weld is applied from the recessed features. The recessed structure enables to accurately identify the position at which the welding head 9 should be aligned during welding, thus enabling a more precise welding.

As shown in fig. 5 to 6, the bump structure 4 includes a first bump structure 41 and a second bump structure 42. The housing exterior forms a first recessed feature 46 and a second recessed feature 47. The first recessed feature 46 is located opposite the first raised feature 41. The second recessed feature 47 is located opposite the second raised feature 42. For example, when the housing is prepared, the first housing half or the second housing half is integrally formed by press molding or injection molding. The first concave structures 46 and the second concave structures 47 are formed on the outer side of the first end surface 11 or the second end surface 21, and the first convex structures 41 and the second convex structures 42 are formed on the inner side of the second end surface 21.

Of course, the preparation method of the housing is not limited to the above embodiment, and those skilled in the art can set the preparation method according to actual needs.

Optionally, the first protruding structures 41 and the second protruding structures 42 are symmetrically arranged with respect to the center of the first end surface 11 or the center of the second end surface 21. The position of the tab (e.g., the second tab 7) at the end face of the jellyroll 5 generally extends to the center position of the end face. The first raised structures 41 and the second raised structures 42 are symmetrically arranged in such a way that the first recessed structures 46 and the second recessed structures 47 are also symmetrically arranged with respect to the center of the end surface. This enables the first and

second projection structures

41 and 42 to more accurately contact the tab (e.g., the second tab 7).

Further, the through hole 50 of the winding core 5 is located at the center position of the winding core 5. This arrangement enables the first and second raised

structures

41, 42 to be located within the through-hole 50.

In one example, as shown in fig. 5, welding is performed with a two-needle welding head 9 at a recessed configuration corresponding to the position of the first raised structure 41 and the second raised structure 42, two welding heads 9 corresponding one-to-one to the two recessed configurations.

For example, during welding, the two welding heads 9 of the double-needle welding head are arranged parallel. One of the welding heads 9 bears against the first recess 46 and the other welding head 9 bears against the second recess 47. Due to the arrangement of the first concave structure 46 and the second concave structure 47, the positioning of the double-needle welding head 9 is more accurate, and the welding precision of the lug and the shell is higher.

Of course, the manner of welding is not limited to the two-pin resistance welding. Laser welding may also be employed. When laser welding is carried out, the welding head 9 is aligned with the first sunken structure 46 and the second sunken structure 47, and after a welding bead penetrates through the shell, the lug is fused, so that the first raised structure 41 is connected with the lug, and the second raised structure 42 is connected with the lug.

In one example, as shown in fig. 7-8, the protrusion structure is an annular protrusion 43, and an annular groove 45 is configured outside the first end surface 11 or the second end surface 21 and opposite to the annular protrusion 43. The annular projection 43 and the annular groove 45 are integrally formed by, for example, press molding or injection molding. The annular protrusion 43 and the annular groove 45 are circular, elliptical, rectangular, etc. For example, the annular projection 43 and the annular groove 45 are shaped to match. For example, the annular protrusion 43 and the annular groove 45 are each U-shaped or V-shaped in cross section. The annular groove 45 can identify the location of the weld from outside the housing.

The annular projection 43 makes the contact area of the tab and the housing larger, and the positioning of the tab and the housing is easier. The annular groove 45 has a larger operating space and positioning area, which makes welding easy.

In one example, a portion of the first end surface 11 or the second end surface 21 in a region surrounded by the annular protrusion 43 forms a central protrusion 44 opposite to a protruding direction of the annular protrusion 43. The conical surface of the surface layer of the central elevation 44 thus serves as a guide, the central elevation 44 guiding the welding head 9 to the bottom of the annular recess.

For example, a position inside the first and second end surfaces 11 and 21 and opposite to the central protrusion 44 forms a central groove. The central groove enables the annular bulge 43 to be more reliably supported with the pole lug.

In one example, as shown in fig. 7, at least two welding spots are formed on the annular protrusion 43. In this example, the weld spot is not continuous, but rather intermittent. In this way, it is possible to avoid the shape of the horn 9 being too complex to be conducive to the manufacture of the horn 9. The intermittent weld spot can be welded using an existing weld head 9 without the need to redesign the weld head 9. The welding yields of the pole lug and the shell are higher due to the at least two welding spots.

For example, the two welding spots are symmetrically arranged with respect to the center of the end face. This makes the connection of the tab to the housing more efficient.

In one example, as shown in fig. 7, the tab (e.g., the second tab 7) is welded to the annular projection 43 using a two-pin weld 9, the two-pin weld 9 being applied within the annular groove 45.

For example, when welding, the two welding heads 9 abut against the bottom of the annular groove 45, and since the annular groove 45 has a larger operating space than the point-shaped grooves (e.g., the first recessed

structures

4,6, and the second recessed structure 47), welding can be performed as long as the two-pin welding head 9 can enter the annular groove 45. Thus, even if the positions of the two welding heads 9 are deviated, the operational reliability of the double-needle resistance welding can be ensured.

In one example, as shown in fig. 7, the width of the recessed feature gradually increases from the bottom of the recessed feature to the open end. For example, the annular groove 45 is V-shaped in cross-section. This enables the twin needle horn 9 to enter the annular groove 45 more easily, reduces the possibility of welding errors, and further improves the positioning accuracy of the twin needle horn 9.

Of course, the welding method is not limited to the two-pin resistance welding, and laser welding, ultrasonic welding, or the like may be employed.

In one example, the projection structure 4 is located at a position of the first end surface 11 or the second end surface 21 opposite to the through hole 50 in the middle of the winding core 5. As shown in fig. 4, 5, and 7, the projection structures 4 are opposed to the through holes 50. Welding is carried out at this position, and the welding spot can be effectively prevented from damaging the roll core 5.

In one example, one of the tabs is connected to the projection 4 and the other tab is electrically connected to the side wall of the housing. For example, the connection is made by resistance welding, laser welding or ultrasonic welding. Resistance welding is as previously described. The tab connected with the side wall can be contacted with the side wall in a pressing manner to realize electric connection. This way the electrical connection of the reeling core 5 to the shell can be realised as well.

In a specific example, one of the two tabs is connected to the positive electrode of the winding core 5, and the other tab is connected to the negative electrode of the winding core 5. The second end face 21 is provided with the protruding structure. One of the tabs is connected to the protruding structure, and the other tab is connected to the first sidewall 12.

For example, as shown in fig. 9 to 10, the second tab 7 is connected to the positive electrode of the winding core 5, and the first tab 6 is connected to the negative electrode of the winding core 5. The first tab 6 is connected to the first side wall 12. For example by means of welding. The second lugs 7 are connected to a raised structure (e.g., annular projection 43) on the second end face 21. For example by means of welding.

In this way, the length of the tab connected to the first side wall 12 can be reduced, so that the electrical resistance of the button cell is reduced.

Furthermore, the tab does not take up space inside the casing in the axial direction, allowing greater manufacture of the reeling core 5. This makes the button cell have a greater capacity.

In one example, two tabs extend from the same end face of the winding core 5.

For example, as shown in fig. 9, the first tab 6 and the second tab 7 each extend from the lower end surface of the winding core 5. The second pole ear 7 is welded to a raised structure (e.g., annular boss 43). The first tab 6 is bent toward the first side wall 12 and welded to the first side wall 12. Since the two tabs extend from the same end face of the winding core 5, assembly of the button cell is facilitated.

In assembly, first, the first tab 6 is attached to the side wall of the winding core 5. Since the upper end face of the winding core 5 is free of tabs, this end face faces the first end face 11 and is placed into the first half shell. The first tab 6 is in contact with the first side wall 12. For example, the first tab 6 is welded to the first side wall 12 from the outside of the first half shell using double pin resistance welding (i.e., resistance welding with a double pin horn).

Then, the second half shell is sleeved outside the first half shell. The second tab 7 is located between the lower end surface of the winding core 5 and the second end surface 21.

Finally, the second lug 7 is welded to the second end face 21. For example, welding is performed by double-pin resistance welding.

One of the tabs may extend from one end surface of the winding core 5, and the other tab may extend from the other end surface of the winding core 5. For example, as shown in fig. 10, the first tab 6 extends from the upper end surface of the winding core 5, and the second tab 7 extends from the lower end surface of the winding core 5.

In assembly, first, the first tab 6 is attached to the side wall of the winding core 5. The upper end face of the reeling core 5 is directed towards the first end face 11 and placed into the first half-shell. The first tab 6 is in contact with the first sidewall 12. For example, the first tab 6 is welded to the first side wall 12 from the outside of the first half shell using double pin resistance welding (i.e., resistance welding with a double pin horn or parallel gap welding).

Of course, the welding method is not limited to the two-pin resistance welding, the double-sided electrode spot welding, and laser welding may be used.

In one example, the first side wall 12 includes a first portion 121 connected to the first end surface 11 and a second portion 122 connected to the first portion 121, the second portion 122 projects radially outward relative to the first portion 121, and a tab connected to the side wall is connected to the second portion 122.

As shown in fig. 9-10, the first electrode is bent and then extends to the second portion 122. Since the second portion 122 projects radially outward relative to the first portion 121, the gap between the second portion 122 and the winding core 5 is large. When welding, the heat can be prevented from damaging the winding core 5.

In addition, a heat insulation glue layer is arranged between the lug and the side wall of the winding core 5. The heat insulation glue layer is made of materials such as plastics, rubber, silica gel or glass fiber. The thermal-insulated glue film can further play thermal-insulated effect, prevents that battery roll core 5 from being damaged in welding process.

In one example, the second sidewall 22 is crimped inward at the junction of the first portion 121 and the second portion 122. As shown in fig. 9-10, the open end of the second sidewall 22 is crimped inwardly at the connecting portion 123. The crimping can be partial crimping or integral crimping. This way the connection of the first half-shell to the second half-shell is made more secure.

According to an embodiment of the present disclosure, an electronic device is provided, which includes a button cell according to any one of the embodiments of the present disclosure.

The electronic equipment has the technical effect brought by the button battery.

In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A button cell, comprising:

a housing comprising a first half shell and a second half shell;

2. The button cell as claimed in claim 1, wherein the winding core has a through hole in the middle, and at least part of the raised structure is located in the through hole.

3. The button cell according to claim 2, wherein the size of the projection structure is smaller than or equal to the size of the through hole in the radial direction of the through hole.

4. The button cell according to claim 1, wherein the winding core has a through hole in the middle, and the projection of the protruding structure on the end face of the winding core at least partially covers the through hole.

5. The button cell according to claim 2, wherein the raised structure is a spherical, annular, bar, radial or planar structure on top of the raised structure.

6. The button battery according to claim 2, wherein a stem is disposed in the through hole, and the stem abuts against the tab; or

7. The button cell according to claim 2, wherein at least one of the tabs is connected to an inner wall of the through hole.

8. The button cell according to claim 1, wherein the height of the protrusion protruding toward the inside of the case is greater than or equal to 0.05 mm.

9. The button cell as set forth in claim 1, wherein the tab is provided with a caulking groove, the protruding structure is provided in the caulking groove, and the top of the protruding structure is in contact with the bottom of the caulking groove.

10. The button cell according to claim 1, wherein the tab includes a first portion and a second portion connected to the first portion, the first portion being connected to the winding core, the second portion of one tab being located between the end face of the winding core and the first end face and being connected to the first end face, the second portion of the other tab being located between the end face of the winding core and the second end face and being connected to the second end face.

11. The button cell according to claim 1, wherein the first end face and the tab or the second end face and the tab are welded by a two-pin welding head.

12. The button cell of claim 1, wherein at least one of the first and second housing halves is a unitary structure.

13. The button cell according to claim 1, wherein the first end face or the second end face is provided with a plurality of the raised structures.

14. The button cell according to claim 13, wherein a recessed structure from which welding is applied is provided on an outer side of the first end face or the second end face and at a position corresponding to the plurality of raised structures.

15. The button cell according to claim 14, wherein the plurality of raised structures comprises a first raised structure and a second raised structure, and the first raised structure and the second raised structure are symmetrically disposed with respect to a center of the first end face or a center of the second end face.

16. The button cell as defined in claim 15, wherein a two-pin welding head is used to weld at the recessed structures corresponding to the positions of the first raised structure and the second raised structure, two welding heads corresponding to two recessed structures one to one.

17. Button cell according to one of claims 1 to 12, wherein a recess is formed on the outside of the first or second end face and opposite the raised structure.

18. The button cell according to claim 17, wherein the protrusion structure is an annular protrusion, and an annular groove is formed on the outer side of the first end face or the second end face and opposite to the annular protrusion.

19. The button cell as defined in claim 18, wherein at least two welding points are formed on the annular protrusion.

20. The button cell according to claim 18, wherein the tab is welded to the annular projection using a two-pin welding head, which is applied in the annular groove.

21. The button cell according to claim 17, wherein the width of the recessed structure increases from the bottom to the open end of the recessed structure.

22. The button cell according to claim 17, wherein the protruding structure is located at a position of the first end face or the second end face opposite to the through hole in the middle of the winding core.

23. The button cell according to claim 1, wherein one of the two tabs is connected to the positive electrode of the winding core and the other tab is connected to the negative electrode of the winding core, and the protruding structure is provided on the second end surface, wherein one tab is connected to the protruding structure and the other tab is connected to the first sidewall.

24. The button cell of claim 23, wherein two tabs extend from the same end face of the jellyroll; or

One of the pole lugs extends out from one end face of the winding core, and the other pole lug extends out from the other end face of the winding core.

25. The button cell according to claim 23, wherein the first sidewall comprises a first portion connected to the first end face and a second portion connected to the first portion, the second portion projecting radially outward relative to the first portion, a tab connected to the sidewall being connected to the second portion.

26. The button cell of claim 25, wherein the second sidewall is curled inward at a connection of the first portion and the second portion.

27. An electronic device, characterized in that it comprises a button cell according to any of claims 1 to 26.