CN108023037B

CN108023037B - Button cell

Info

Publication number: CN108023037B
Application number: CN201711352494.XA
Authority: CN
Inventors: 黄凯; 韩建国; 周超; 唐晶莹
Original assignee: Zhuhai Micromatrix Industry Co ltd
Current assignee: Zhuhai Juneng New Energy Co ltd
Priority date: 2017-12-15
Filing date: 2017-12-15
Publication date: 2024-06-25
Anticipated expiration: 2037-12-15
Also published as: CN108023037A

Abstract

The invention relates to a button cell, which comprises a shell and an electrode isolation assembly arranged in the shell, wherein the electrode isolation assembly comprises at least one positive electrode and at least one negative electrode; the shell comprises a lower shell with an opening at the top and a conductive top cover matched with the lower shell, wherein the top cover is electrically connected with one of the at least one positive electrode and the at least one negative electrode; the top cover comprises a leading-out hole, a conductor is arranged in the leading-out hole, an insulating sealing body used for insulating the top cover is arranged between the hole wall of the leading-out hole and the conductor, and the conductor is electrically connected with the other of the at least one positive electrode and the at least one negative electrode; the middle part of the top cover sinks to form a sinking part, and the leading-out hole is positioned on the sinking part.

Description

Button cell

Technical Field

The present invention relates to a battery, and more particularly, to a button battery.

Background

Button cells in the prior art generally comprise a housing consisting of two electrically conductive housing halves, a lower housing and a top cover. Typically, the lower case has a positive polarity and the top cover has a negative polarity, with the positive and negative poles being located at the ends of the coin cell. When the protective plate is required to be installed in some application occasions, the positive input interface and the negative input interface of the protective plate are respectively electrically connected with the positive electrode and the negative electrode of the button cell, so that the negative input interface is led out from the top cover, the positive input interface is led out from the lower shell and wound above the top cover along the shell, and the space utilization rate is low.

In chinese patent application No. 201710901425.3, a button cell is provided, the casing of which comprises an electrically conductive end wall, the end wall comprising at least one outlet hole, an electrical conductor being provided in the at least one outlet hole, an insulating seal being provided between the wall of the at least one outlet hole and the electrical conductor for insulation with the end wall. The positive electrode and the negative electrode of the button cell are respectively and electrically connected with the end wall and the electric conductor positioned on the end wall, so that the positive electrode and the negative electrode are positioned on the same side of the button cell. However, the conductor and the insulating sealing body of the button cell protrude outside the top cover, and the space utilization rate is reduced when the protective plate is not required to be mounted.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an improved button cell aiming at the defects in the prior art.

The technical scheme adopted for solving the technical problems is as follows: a button cell is constructed, comprising a case and an electrode separation assembly disposed within the case, the electrode separation assembly comprising at least one positive electrode and at least one negative electrode; the shell comprises a lower shell with an opening at the top and a conductive top cover matched with the lower shell; the top cover is electrically connected with one of the at least one positive electrode and the at least one negative electrode; the top cover comprises a leading-out hole, a conductor is arranged in the leading-out hole, an insulating sealing body used for insulating the top cover is arranged between the hole wall of the leading-out hole and the conductor, and the conductor is electrically connected with the other of the at least one positive electrode and the at least one negative electrode; the middle part of the top cover sinks to form a sinking part, and the leading-out hole is positioned on the sinking part.

In some embodiments, the countersink includes a cylindrical side wall and an inwardly projecting bottom wall connected to a lower peripheral edge of the side wall, the exit hole being formed in the bottom wall, the peripheral edge of the exit hole extending downwardly to form a circumferential wall.

In some embodiments, the electrode isolation assembly is placed in the housing in the form of a spiral winding, the electrode isolation assembly including a receiving space into which the sink extends.

In some embodiments, the central axis of the receiving space coincides with the central axis of the electrode isolation assembly.

In some embodiments, the insulating sealing body is hermetically plugged in the lead-out hole, the electric conductor longitudinally penetrates through the insulating sealing body, and two ends of the electric conductor are respectively exposed from two ends of the insulating sealing body.

In some embodiments, the electrical conductor is flexible.

In some embodiments, the positive electrode is electrically connected to the top cover and the negative electrode is electrically connected to the electrical conductor.

In some embodiments, the lower shell is cylindrical, and the periphery of the top cover is hermetically combined with the opening edge of the lower shell through a laser welding mode.

In some embodiments, the button cell further comprises a fixing plate disposed above the insulating seal for fixing the insulating seal in the lead-out hole.

In some embodiments, the top surface of the securing plate is flush with the top surface of the top cover.

The implementation of the invention has at least the following beneficial effects: according to the button cell, the top cover is sunk to form the sunk part, and the lead-out hole is formed in the sunk part, so that the insulating sealing body is sunk below the top surface of the top cover, the insulating sealing body is prevented from protruding above the top cover, and the space utilization rate is improved.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic view of a longitudinal sectional structure of a button cell in some embodiments of the present invention.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It should be noted that, the terms "inner," "outer," "upper," "lower," "top," "bottom," and the like indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings or the orientation or position relationship conventionally put in use of the inventive product, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "vertical," "horizontal," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Fig. 1 illustrates a button cell in some embodiments of the invention, which includes a sealed housing 1, an electrode separator assembly 2, an insulating seal 3, and an electrical conductor 4. The housing 1 comprises a lower shell 11 with an opening at the top and a matched conductive top cover 12, wherein the top cover 12 is sunk to form a sunk part 121, and a lead-out hole 123 is formed in the sunk part 121. The insulating sealing body 3 is sealingly plugged into the lead-out hole 123, the conductor 4 is longitudinally inserted into the insulating sealing body 3, and both ends of the conductor are exposed from both ends of the insulating sealing body 3. The insulating seal 3 insulates the electrical conductor 4 from the top cover 12. In some embodiments, the top cover 12 may further be provided with a filling hole (not shown) for filling the electrolyte into the casing 1. The button cell may further comprise a blocking member (not shown) for blocking the liquid injection hole after the completion of the liquid injection.

The electrode separator assembly 2 includes at least one positive electrode 21 and at least one negative electrode 22, and a separator 23 between the positive electrode 21 and the negative electrode 22, the positive electrode 21 being electrically connected to the top cover 12, the negative electrode 22 being electrically connected to the electrical conductor 4. It will be appreciated that in some embodiments, the negative electrode 22 may be electrically connected to the top cover 12, and the positive electrode 21 may be electrically connected to the electrical conductor 4. The electrode separator assembly 2 may take the form of a spiral winding or may take the form of a laminate. In some embodiments, electrode separator assembly 2 includes a receiving space 24, and a countersink 121 extends into receiving space 24.

As further shown in fig. 1, in some embodiments, the countersink 121 includes a vertical cylindrical side wall 1211 and a horizontally inwardly extending bottom wall 1212 connected to the lower periphery of the side wall 1211, with an exit aperture 123 disposed in the bottom wall 1212, the periphery of the exit aperture 123 extending vertically downwardly to form an annular wall 1213. The upper periphery of the side wall 1211 is connected in combination with the top cover 12.

In the embodiment shown in fig. 1, the electrode separator 2 is disposed in the case 1 in the form of a spiral winding, and after winding is completed, the winding core is withdrawn to form an axial cavity. The receiving space 24 is located in the axial cavity. Preferably, the central axis of the electrode isolation assembly 2 coincides with the central axis of the case 1. Preferably, the central axis of the receiving space 24 coincides with the central axis of the electrode separation assembly 2. As can be appreciated, the button cell can make the insulating sealing body 3 sink below the top surface of the top cap 12 by disposing the receiving space 24 in the axial cavity of the electrode isolation assembly 2, thereby preventing the insulating sealing body 3 from protruding above the top cap 12 and improving the space utilization.

The housing 1 may in some embodiments be in the shape of a flattened cylinder comprising a flattened bottom area and a flattened top area parallel thereto. The lower shell 11 may in some embodiments be a cylindrical structure with an opening at the top. In some embodiments, the periphery of the top cover 12 may be sealingly bonded to the open edge of the lower shell 11 by means of laser welding.

In some embodiments, the conductive body 4 may be made of a rigid conductive material to enhance the resistance to compression, and may be elongated, T-shaped, or i-shaped. In other embodiments, the electrical conductor 4 may be made of a flexible conductive material, and when the protective plate needs to be mounted, the electrical conductor 4 may be directly connected to the protective plate or the load without additional welding wires. In some embodiments, the insulating sealing body 3 and the electric conductor 4 may be integrally injection molded, and at this time, the liquid injection hole and the lead-out hole 123 may be the same, and after the liquid injection is completed, the insulating sealing body 3 and the electric conductor 4 after the integral injection molding are plugged for sealing.

In some embodiments, the button cell further comprises a fixing plate 5 disposed above the insulating sealing body 3 for fixing the insulating sealing body 3 in the outlet hole 123. The fixing plate 5 is also provided with a through hole for the electric conductor 4 to pass through. In some embodiments, the top surface of the securing plate 5 is flush with the top surface of the top cover 12. In some embodiments, the periphery of the securing plate 5 may be joined to the top cover 12 by means of laser welding.

It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A button cell comprising a housing and an electrode isolation assembly disposed within the housing, the electrode isolation assembly comprising at least one positive electrode and at least one negative electrode; the shell comprises a lower shell with an opening at the top and a conductive top cover matched with the lower shell; the top cover is electrically connected with one of the at least one positive electrode and the at least one negative electrode; the top cover comprises a leading-out hole, a conductor is arranged in the leading-out hole, an insulating sealing body used for insulating the top cover is arranged between the hole wall of the leading-out hole and the conductor, and the conductor is electrically connected with the other of the at least one positive electrode and the at least one negative electrode; the novel insulating sealing device is characterized in that the top cover is sunk to form a sunk part, the leading-out hole is positioned on the sunk part, and the insulating sealing body does not protrude above the top cover.

2. The button cell of claim 1, wherein the countersink comprises a cylindrical side wall and an inwardly projecting bottom wall connected to a lower peripheral edge of the side wall, the lead-out hole being formed in the bottom wall, a peripheral edge of the lead-out hole extending downward to form a circumferential wall.

3. The button cell of claim 1 or 2, wherein the electrode separator assembly is placed in the case in the form of a spiral winding, the electrode separator assembly comprising a receiving space into which the sink protrudes.

4. The button cell of claim 3, wherein the central axis of the receiving space coincides with the central axis of the electrode isolation assembly.

5. The button cell of claim 1 or 2, wherein the insulating sealing body is sealingly plugged in the lead-out hole, the electric conductor is longitudinally penetrating through the insulating sealing body, and both ends of the electric conductor are respectively exposed from both ends of the insulating sealing body.

6. The button cell defined in claim 5 wherein the electrical conductor is flexible.

7. The button cell of claim 1 or 2, wherein the positive electrode is electrically connected to the top cap and the negative electrode is electrically connected to the electrical conductor.

8. The button cell of claim 1 or 2, wherein the lower case is cylindrical, and the periphery of the top cover is sealingly bonded to the opening edge of the lower case by laser welding.

9. The button cell of claim 1 or 2, further comprising a fixing plate disposed above the insulating seal for fixing the insulating seal in the outlet hole.

10. The button cell of claim 9, wherein the top surface of the securing plate is flush with the top surface of the top cover.