CN218919081U

CN218919081U - Button cell

Info

Publication number: CN218919081U
Application number: CN202223316356.5U
Authority: CN
Inventors: 周金勇; 罗功起; 谢继春; 席阳; 覃亲涵
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-04-25
Anticipated expiration: 2032-12-09

Abstract

The application provides a button cell, which comprises a shell, a winding core, a shell cover assembly and a switching assembly, wherein a containing cavity is formed in the shell, one end of the containing cavity is provided with an opening, and the winding core is contained in the containing cavity through the opening; the winding core comprises a winding core body, a first tab and a second tab, wherein the first tab and the second tab are connected to the winding core body, and a shell cover assembly with opposite polarities of the first tab and the second tab is covered on the opening, the shell cover assembly comprises a first shell cover and a first insulating layer, and the first shell cover is provided with a sinking platform part; the first insulating layer is arranged on the sinking platform part; the switching subassembly includes first switching piece and second switching piece, and first switching piece is connected in first cap to communicate with first utmost point ear, and the second switching piece is located one side of first insulating layer's deviating from the core body of rolling up, and communicates with the second utmost point ear. The volumetric energy density of the button cell of the present application is higher.

Description

Button cell

Technical Field

The application relates to the technical field of batteries, in particular to a button cell.

Background

With development of science and technology, wearable electronic products are becoming more and more popular in life of people, and lithium ion batteries are a main power supply source of the wearable electronic products.

Button cell generally includes casing, electric core, cap and insulating gummed paper etc. the one end of casing has the opening, and the electric core sets up in the casing through the opening, and the cap is connected with electric core electricity, is provided with the change piece on the cap, and the change piece is used for drawing forth the positive pole or the negative pole of electric core for electronic equipment power supply, insulating gummed paper is used for avoiding positive pole change piece and negative pole change piece contact and causes the short circuit.

However, the button cell in the related art has a high height, resulting in a low volumetric energy density of the button cell.

Disclosure of Invention

Based on this, the present application provides a button cell to solve the deficiencies in the related art.

The button cell comprises a shell, a winding core, a shell cover assembly and a switching assembly, wherein an accommodating cavity is formed in the shell, one end of the accommodating cavity is provided with an opening, and the winding core is accommodated in the accommodating cavity through the opening; the winding core comprises a winding core body, a first tab and a second tab, wherein the first tab and the second tab are connected to the winding core body, and the polarities of the first tab and the second tab are opposite;

the shell cover assembly is arranged on the opening and comprises a first shell cover and a first insulating layer, and the first shell cover is provided with a sinking platform part; the first insulating layer is arranged on the sinking platform part; the switching subassembly includes first switching piece and second switching piece, and first switching piece is connected in first cap to communicate with first utmost point ear, and the second switching piece is located one side of first insulating layer's deviating from the core body of rolling up, and communicates with the second utmost point ear.

As an optional embodiment, the button cell that this application provided, the structure that is not in heavy bench portion of first cap forms the boss, and the core body one side is rolled up in deviating from of boss has first terminal surface, and core body one side is rolled up in deviating from of first insulating layer has the second terminal surface, and first terminal surface flushes with the second terminal surface.

As an optional embodiment, the button cell provided by the application, the first cap is arc-shaped, and the ratio of the central angle of the boss to the central angle of the sinking platform part is 1:1-1:3.

as an optional implementation manner, the button cell that this application provided, first cap orientation holds chamber one side and is equipped with the location mounting groove, and the tank bottom of location mounting groove and the terminal surface butt of casing to make first cap orientation hold chamber one end and sink into and hold the intracavity.

As an alternative embodiment, the button cell provided by the application, the first switching piece comprises a first sheet body and a first pin which are connected with each other, the first sheet body is connected to the first end face, and the first pin is bent towards the outer side of the opening;

and/or the second switching piece comprises a second sheet body and a second pin which are mutually connected, the second sheet body is connected with the second shell cover, and the second pin is bent towards the outer side of the opening. As an alternative embodiment, the button cell provided herein, the cap assembly further includes a second cap, the second cap is located on a side of the first cap facing the winding core, and the second tab is electrically connected to the second switching piece through the second cap.

As an alternative embodiment, the button cell provided herein, the end face of the first sheet body facing away from the winding core body and the end face of the second sheet body facing away from the winding core body are flush.

As an optional implementation manner, in the button cell provided by the application, the first pin and the first sheet body are arranged at an included angle, and the included angle ranges from 80 degrees to 120 degrees; the second pin and the first pin are arranged in parallel.

As an optional embodiment, the projection of the first pin and the projection of the second pin along the radial direction of the winding core body of the button cell provided by the application are both located in the first insulating layer.

As an alternative embodiment, the button cell provided herein has the end of the first lead and the end of the second lead disposed at equal heights with respect to the first insulating layer.

As an optional embodiment, the button cell that this application provided still includes the shutoff piece, and the one end that deviates from the opening of casing is equipped with annotates the liquid hole, and the shutoff piece is configured to seal annotates the liquid hole, and the terminal surface that deviates from of shutoff piece is flushly with the outer wall of casing.

As an alternative embodiment, the button cell provided by the application, the plugging piece comprises a body and a positioning boss connected with the body, wherein the positioning boss protrudes towards the winding core;

the liquid injection hole comprises a first communication section and a second communication section which are communicated with each other from the inner side of the shell to the outer side of the shell in sequence, the aperture of the second communication section is larger than that of the first communication section, the positioning boss is inserted into the first communication section, and the body is arranged on the second communication section.

As an optional implementation manner, the button cell that this application provided, second cap deviate from and roll up core body one side and be equipped with the conductive column, first cap is equipped with dodges the hole of dodging of conductive column, and the second switching piece is connected in the conductive column.

As an alternative embodiment, the button cell provided herein, the cap assembly further includes an annular adhesive layer, and opposite sides of the annular adhesive layer are respectively connected to the first cap and the second cap.

As an optional embodiment, the button cell that this application provided still includes first adhesive linkage, and first adhesive linkage lid is located and is rolled up core body one side facing away from of adapting assembly, and the end of first pin and second pin all is located outside the first adhesive linkage.

The button cell that this application embodiment provided, casing, book core, cap subassembly and switching subassembly, the casing is including holding the chamber, and book core is including rolling up core body, first utmost point ear and second ear, and cap subassembly includes first cap and first insulating layer, and switching subassembly includes first change-over piece and second change-over piece. Through setting up the chamber that holds at the casing and be used for holding the core, be used for providing the contact point of charge and discharge for the core body through setting up first utmost point ear and second ear, be used for leading out first utmost point ear and second ear through setting up first cap, be used for intercommunication first utmost point ear and first switching piece, be used for insulating isolation first switching piece and second switching piece through setting up first insulating layer, through setting up heavy bench portion at first cap, and set up first insulating layer in heavy bench portion, so that whole or partial high overlap of first insulating layer and first cap, thereby reduce the overall height of button cell, from this, the volumetric energy density of the button cell of this application is higher.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a button cell provided in an embodiment of the present application;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic view of the internal structure of FIG. 1;

FIG. 4 is a schematic view of the housing of FIG. 2;

FIG. 5 is an enlarged view of a portion of FIG. 3 at A;

FIG. 6 is an enlarged view of a portion of FIG. 3 at B;

FIG. 7 is a schematic view of the first cover in FIG. 2;

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a C-C cross-sectional view of FIG. 8;

FIG. 10 is a schematic view of the first tab of FIG. 2;

FIG. 11 is a schematic view of the second cover in FIG. 2;

FIG. 12 is a schematic view of the second switch plate of FIG. 2;

FIG. 13 is a top view of FIG. 4;

FIG. 14 is a schematic view of the closure of FIG. 2;

FIG. 15 is an enlarged view of a portion of FIG. 4 at D;

fig. 16 is a schematic view of the structure of the annular adhesive layer in fig. 2.

Reference numerals illustrate:

100-a housing; 110-a receiving cavity; 120-liquid injection holes; 121-a first communication section; 122-a second communication section;

200-winding the core; 210-winding core body; 220-a first tab; 230-second pole ear; 240-a second insulating layer; 250-a third insulating layer;

300-a housing cover assembly;

310-a first cover; 311-sinking platform part; 312-boss; 313-positioning the mounting groove; 314-avoiding holes;

320-a first insulating layer;

330-a second cover; 331-conductive pillars;

340-an annular adhesive layer;

400-switching assembly; 410-a first tab; 411-a first sheet; 412-a first pin; 420-a second switching piece; 421-a second sheet; 422-second pin;

500-plugging piece; 510-a body; 520-positioning a boss;

600-a first adhesive layer;

700-a second adhesive layer.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Embodiments of the present application are described in detail below with reference to the accompanying drawings.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected through an intermediary, in communication between two elements, or in an interaction relationship between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on the drawings, which are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The terms "first," "second," "third" (if any) in the description and claims of the present application and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of operation in sequences other than those illustrated or described herein, for example.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or display that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or display.

However, the button cell in the related art has a high height, resulting in a low volumetric energy density of the button cell. This is because the high piece that will lead to of insulating adhesive tape lifts to lead to button cell's high increase, and because the reason of insulating adhesive tape thickness, need make conductive post surface be higher than electric core surface, the piece that also need do the bending structure and dodge insulating adhesive tape, thereby leads to button cell high increase, increases spare part processing degree of difficulty increase cost simultaneously.

Secondly, the sealing piece of button cell is a flat piece, and the sealing piece welds behind the casing outer wall, and the sealing piece is outstanding state, leads to button cell overall height to increase, influences button cell volume energy density to this kind of sealing piece location is inconvenient when welding, leads to the weeping probability to increase after welding easily.

In view of the foregoing, an embodiment of the present application provides a button cell, in which a sinking platform portion is disposed on a first casing cover, and a first insulating layer is disposed on the sinking platform portion, so as to reduce the occupied height of the first insulating layer, thereby reducing the overall height of the button cell, and improving the volumetric energy density of the button cell.

The following describes in detail the technical solution of the button cell provided in the embodiments of the present application with reference to the accompanying drawings.

Referring to fig. 1 to 7, the button cell provided in the embodiments of the present application includes a housing 100, a winding core 200, a housing cover assembly 300 and a switching assembly 400, wherein a receiving cavity 110 is provided in the housing 100, one end of the receiving cavity 110 has an opening, and the winding core 200 is received in the receiving cavity 110 through the opening. The winding core 200 includes a winding core body 210, a first tab 220 and a second tab 230, wherein the first tab 220 and the second tab 230 are connected to the winding core body 210, and polarities of the first tab 220 and the second tab 230 are opposite.

The cover assembly 300 is disposed in the opening, and the cover assembly 300 includes a first cover 310 and a first insulating layer 320, the first cover 310 is provided with a sinking platform portion 311, and the first insulating layer 320 is disposed on the sinking platform portion 311. The switching assembly 400 includes a first switching piece 410 and a second switching piece 420, the first switching piece 410 is connected to the first housing cover 310 to communicate with the first tab 220, and the second switching piece 420 is located on a side of the first insulating layer 320 facing away from the winding core body 210 and communicates with the second tab 230.

In this application, the case 100 is used to accommodate the winding core 200 and the electrolyte, the winding core 200 is a main functional structure of the button cell for generating current together with the electrolyte, the case cover assembly 300 is used to close the case 100, and the positive electrode or the negative electrode of the winding core 200 is drawn out together with the switching assembly 400, so that the electronic device is electrically connected with the button cell.

The housing 100 may be made of stainless steel, and the material of the housing 100 is not limited in this embodiment. The case 100 may include a bottom wall and a side wall, the bottom wall may be circular, oval, etc., the side wall of the case 100 surrounds the outer edge of the bottom wall, and the side wall meets the outer edge of the bottom wall, so that a receiving chamber 110 is defined between the side wall and the bottom wall for receiving the winding core 200 and the electrolyte. Meanwhile, the top of the case 100 may be provided with an opening, which communicates with the receiving chamber 110.

The winding core 200 includes a winding core body 210, a first tab 220 and a second tab 230 with opposite polarities, wherein one of the first tab 220 and the second tab 230 is an anode, the other is a cathode, and the first tab 220 and the second tab 230 can be disposed at two ends of the winding core body 210 in the axial direction.

The adapter assembly 400 includes a first adapter tab 410 in communication with the first tab 220 and a second adapter tab 420 in communication with the second tab 230. For example, the first tab 220 is a negative electrode, the second tab 230 is a positive electrode, the first tab 220 is disposed at an end of the winding core body 210 facing away from the opening, and the second tab 230 is disposed at an end of the winding core body 210 facing toward the opening. Thus, the first tab 410 may draw out the negative electrode of the button cell, and the second tab 420 may draw out the positive electrode of the button cell.

The cap assembly 300 includes a first cap 310 and a first insulating layer 320, the first switching tab 410 communicates with the first tab 220 through the first cap 310, the first insulating layer 320 is connected to the first cap 310, and the first insulating layer 320 is disposed between the second switching tab 420 and the first cap 310, so that the first insulating layer 320 can be used to isolate the first switching tab 410 from the second switching tab 420, so as to insulate the first switching tab 410 from the second switching tab 420, and prevent a short circuit caused by the positive and negative electrode communication of the button cell. For example, the first insulating layer 320 may be polypropylene adhesive, and the first insulating layer 320 may be thermally fused with the first cover 310.

The first cover 310 is provided with the sinking platform 311, and the first insulating layer 320 is adhered to the sinking platform 311, so that the first insulating layer 320 and the first cover 310 can share a part of height, so that the part of the first insulating layer, which is adhered to and protrudes out of the first cover 310, is fewer, and the overall height of the button cell is reduced, thereby improving the volume energy density of the button cell. Wherein, the recess depth of the countersunk land portion 311 may be less than, equal to, or greater than the thickness of the first insulating layer 320.

For example, when the recess depth of the countersunk portion 311 is greater than or equal to the thickness of the first insulating layer 320, the first insulating layer does not protrude out of the first housing cover 310, the first insulating layer 320 overlaps the height of the first housing cover 310, and the first insulating layer 320 does not occupy the height of the button cell additionally. When the recess depth of the countersunk portion 311 is smaller than the thickness of the first insulating layer 320, the first insulating layer 320 partially protrudes out of the first housing cover 310, the first insulating layer 320 partially overlaps the height of the first housing cover 310, and the first insulating layer 320 occupies a smaller height of the button cell.

It should be understood that the height direction of the button cell described in the embodiments of the present application is the axial direction of the winding core 200.

The embodiment of the application provides a button cell, a housing 100, a winding core 200, a housing cover assembly 300 and a switching assembly 400, wherein the housing 100 comprises a housing cavity 110, the winding core 200 comprises a winding core body 210, a first tab 220 and a second tab 230, the housing cover assembly 300 comprises a first housing cover 310 and a first insulating layer 320, and the switching assembly 400 comprises a first switching piece 410 and a second switching piece 420. The overall height of the button cell is reduced by providing the housing 100 with the receiving cavity 110 for receiving the winding core 200, providing the first tab 220 and the second tab 230 for providing the contact points for charging and discharging the winding core body 210, providing the first tab 410 and the second tab 420 for guiding out the first tab 220 and the second tab 230, providing the first cover 310 for communicating the first tab 220 and the first tab 410, providing the first insulating layer 320 for insulating the first tab 410 and the second tab 420, providing the first cover 310 with the sink stand portion 311, and providing the first insulating layer 320 at the sink stand portion 311, so that the first insulating layer 320 and the first cover 310 share at least a part of the height, whereby the volumetric energy density of the button cell of the present application is high.

Referring to fig. 2 and 7, in some embodiments, the structure of the first cover 310 that is not located at the countersunk portion 311 forms a boss 312, a side of the boss 312 facing away from the winding core body 210 has a first end surface, and a side of the first insulating layer 320 facing away from the winding core body 210 has a second end surface, where the first end surface is flush with the second end surface.

In this way, after the first cover 310 of the first insulating layer 320 is connected, the first end surface of the first insulating layer 320 is in the same plane with the second end surface of the boss 312, so that the first insulating layer 320 does not need to occupy the height of the button cell additionally, and the first tab 410 does not need to bend to avoid the first insulating layer 320, so that the processing difficulty of the first tab 410 can be reduced, the processing cost can be reduced, and the height of the button cell occupied by the first tab 410 can be reduced, thereby reducing the overall height of the button cell.

In some embodiments, the first insulating layer 320 matches the shape of the countersink 311. In this way, the first insulating layer 320 can be made to entirely cover the countersunk portion 311 so as to facilitate connection of the two and to insulate the first and

second switching pieces

410 and 420.

In some embodiments, the first housing cover 310 has an arc shape, for example, the first housing cover 310 has a circular shape, and the ratio of the central angle of the boss 312 to the central angle of the countersink 311 is 1:1-1:3, that is, the boss 312 occupies one-fourth to one-half of the area on the first cover 310, and the land 311 occupies one-half to three-fourths of the area on the first cover 310, so that the first cover 310 has a sufficient area for connecting the first insulating layer 320 and a sufficient area for connecting the first tab 410.

Referring to fig. 4, 8 and 9, in one possible implementation, a positioning and mounting groove 313 is formed on a side of the first housing cover 310 facing the accommodating cavity 110, and a groove bottom of the positioning and mounting groove 313 abuts against an end surface of the housing 100, so that the end surface of the first housing cover 310 facing the accommodating cavity 110 is sunk into the accommodating cavity 110. Therefore, when the first housing cover 310 is connected with the housing 100, the first housing cover 310 can be initially positioned through the positioning mounting groove 313, so that the assembly difficulty is reduced, and after the mounting groove is formed on the side, facing the accommodating cavity 110, of the first housing cover 310, the protrusion is formed on the side, facing the accommodating cavity 110, of the first housing cover 310 and is accommodated in the accommodating cavity 110, so that the height of the first housing cover 310 occupied the button cell can be reduced, and the overall height of the button cell is reduced.

Referring to fig. 7 and 10, in the embodiment, the first tab 410 includes a first sheet 411 and a first pin 412 that are connected to each other, the first sheet 411 is connected to the first end surface, and the first pin 412 is bent to the outside of the opening. In this way, the first tab 220, the first housing cover 310, the first tab 411 and the first pin 412 are sequentially connected to each other, so as to supply power, and the first pin 412 extends out of the housing 100 to be connected to an electronic device.

As an alternative embodiment, the cover assembly 300 further includes a second cover 330, the second cover 330 being located on a side of the first cover 310 facing the winding core 200, and the second tab 230 being electrically connected to the second adapter 420 through the second cover 330. Thus, the second lug 230, the second cover 330 and the second switching piece 420 communicate in order to supply electricity. Wherein, the surface of the first tab 220 facing away from the winding core body 210 and the surface of the second tab 230 facing away from the winding core body 210 may be provided with welding marks, so that the first tab 220 is welded to the inner bottom wall of the accommodating cavity 110, and the second tab 230 is welded to the surface of the second housing cover 330 facing the accommodating cavity 110. The solder marks may be square, circular, etc., which is not limited in the embodiment of the present application, as long as the solder marks do not exceed the first tab 220 or the second tab 230.

Referring to fig. 11 and 12, in a specific implementation, the second adapter piece 420 includes a second sheet 421 and a second pin 422 that are connected to each other, the second sheet 421 is connected to the second housing cover 330, and the second pin 422 is bent toward the outside of the opening. In this way, the second tab 230, the second cover 330, the second sheet 421 and the second pin 422 are sequentially connected to each other, so as to supply power, and the second pin 422 extends out of the housing 100 to connect with an electronic device.

In one possible implementation, the end face of the first sheet 411 facing away from the winding core body 210 is flush with the end face of the second sheet 421 facing away from the winding core body 210. In this way, when the first sheet 411 is connected to the first end surface, and the second sheet 421 is connected to the second casing cover 330 on the side facing away from the winding core 200, the end surface of the first sheet 411 facing away from the winding core body 210 and the end surface of the second sheet 421 facing away from the winding core body 210 are in the same plane, so that the heights of the first sheet 411 and the second sheet 421 occupied by the button cell are partially overlapped, so that the heights of the first sheet 411 and the second sheet 421 are prevented from being higher or lower, and the overall height of the button cell is reduced.

It will be appreciated that, when the first sheet 411 is connected to the first end surface and the second sheet 421 is connected to the second cover 330 on the side facing away from the winding core 200, the first pin 412 and the second pin 422 should be kept at a certain distance, and the first pin 412 and the second pin 422 should be parallel to avoid short-circuiting the button cell, and to facilitate connection with an electronic device.

The first pin 412 may form an included angle with the first sheet 411, where the included angle ranges from 80 ° to 120 °, so that the first pin 412 maintains a reasonable inclination angle range with respect to the first sheet 411, so as to be connected with an electronic device. It can be appreciated that if the angle between the first pin 412 and the first sheet 411 is smaller than 80 ° or larger than 120 °, the first pin 412 is too inclined relative to the first sheet 411, which is not beneficial for the first pin 412 to pass through the assembly hole of the electronic device.

In addition, in order to facilitate the simultaneous soldering of the first and

second pins

412 and 422 with the pads of the electronic device, the ends of the first and

second pins

412 and 422 may be disposed at the same height with respect to the first insulating layer 320.

In some embodiments, the projections of the first pin 412 and the second pin 422 along the radial direction of the winding core body 210 are located in the first insulating layer 320, so that the first insulating layer 320 can insulate the first pin 412 from the second pin 422 after the assembled button cell. Referring to fig. 13 and 14, as an alternative implementation manner, the button cell provided in this embodiment of the present application further includes a blocking member 500, where the end of the housing 100 facing away from the opening is provided with the liquid injection hole 120, the blocking member 500 is configured to close the liquid injection hole 120, and an end surface of the blocking member 500 facing away from the winding core body 210 is flush with an outer wall of the housing 100.

It will be appreciated that after the winding core 200, the cover assembly 300 and the case 100 are assembled, electrolyte can be injected into the interior of the button cell through the injection hole 120, and then the injection hole 120 is blocked by the blocking member 500 to prevent leakage of the electrolyte.

In order to further reduce the overall height of the button cell, after the plugging piece 500 is connected with the housing 100, the end surface of the plugging piece 500 facing away from the winding core body 210 is in the same plane with the outer wall of the housing 100, and compared with the mode that the sealing piece protrudes from the outer wall of the housing 100 in the related art, the plugging piece 500 can overlap with the housing 100 in terms of occupied height and cannot protrude out of the outer wall of the housing 100, so that the plugging piece 500 does not occupy the height of the button cell additionally, and the overall height of the button cell is reduced.

Referring to fig. 14 and 15, in a specific implementation, the plugging member 500 includes a body 510 and a positioning boss 520 connected to the body 510, where the positioning boss 520 protrudes toward the winding core 200. The liquid injection hole 120 comprises a first communication section 121 and a second communication section 122 which are sequentially communicated from the inside of the shell 100 to the outside of the shell 100, the aperture of the second communication section 122 is larger than that of the first communication section 121, the positioning boss 520 is inserted into the first communication section 121, and the body 510 is arranged on the second communication section 122.

Thus, the positioning boss 520 and the body 510 form a step columnar structure, the first communication section 121 and the second communication section 122 form a step hole-shaped structure, the positioning boss 520 is matched with the first communication section 121, the body 510 is matched with the second communication section 122, when the plugging piece 500 is made to seal the liquid injection hole 120, the positioning boss 520 can be inserted into the first communication section 121 at first so as to preliminarily position the plugging piece 500, so that the assembly difficulty of the plugging piece 500 is reduced, the liquid leakage probability of the plugging piece 500 is reduced, then the body 510 is made to face the end face of the accommodating cavity 110 and the end face of the second communication section 122 to abut against, and finally the end face of the body 510 deviating from the accommodating cavity 110 is made to be welded with the outer wall of the shell 100, so that the plugging piece 500 completely seals the liquid injection hole 120.

Referring to fig. 11 and 12, in one possible implementation manner, a conductive post 331 is disposed on a side of the second housing cover 330 facing away from the winding core body 210, the first housing cover 310 is provided with a avoiding hole 314 for avoiding the conductive post 331, and the second sheet 421 is connected to the conductive post 331. Thus, the conductive post 331 may extend through the avoidance hole 314, so that the second sheet 421 is connected to the conductive post 331, and thus, the current flows to the electronic device through the second tab 230, the conductive post 331, the second sheet 421 and the second pin 422 in sequence.

Since the first insulating layer 320 is disposed on the countersunk portion 311, the end surface of the conductive post 331 may be flush with the first end surface of the boss 312, so that the end surface of the conductive post 331 does not need to be higher than the first end surface of the boss 312, and the overall height of the button cell may be reduced. And when the first sheet 411 is connected to the boss 312 and the second sheet 421 is connected to the conductive post 331, the thicknesses of the first sheet 411 and the second sheet 421 can be made uniform, so that the end surface of the first sheet 411 facing away from the winding core body 210 is flush with the end surface of the second sheet 421 facing away from the winding core body 210, thereby further reducing the overall height of the button cell and facilitating the connection of the first pin 412 and the second pin 422 with the electronic device.

Referring to fig. 2 and 16, as an alternative embodiment, the cover assembly 300 further includes an annular adhesive layer 340, and opposite sides of the annular adhesive layer 340 are respectively connected to the first cover 310 and the second cover 330. Since the polarities of the first cover 310 and the second cover 330 are opposite, the polarities of the first cover 310, the first tab 410 and the second tab 330 are the same as those of the first tab 220, and the polarities of the second cover 330, the second tab 420 and the second tab 230 are the same as those of the first tab 230, and thus, an annular adhesive layer 340 is disposed between the first cover 310 and the second cover 330 to insulate the first cover 310 and the second cover 330 by the annular adhesive layer 340, so as to avoid a short circuit caused by contact between the first cover 310 and the second cover 330.

Referring to fig. 5 and 6, in one possible implementation, the winding core 200 further includes a second insulating layer 240 and a third insulating layer 250, the second insulating layer 240 is connected between the winding core body 210 and the first tab 220, and the third insulating layer 250 is connected between the winding core body 210 and the second tab 230.

It can be understood that the first tab 220 is connected to the inner bottom wall of the accommodating cavity 110, that is, the polarity of the housing 100 is the same as that of the first tab 220, the second tab 230 is connected to the end face of the second housing cover 330 facing the accommodating cavity 110, and in order to prevent the winding core body 210 from contacting the first housing cover 310, the second insulating layer 240 is disposed between the winding core body 210 and the first tab 220, so as to prevent the winding core body 210 from contacting the inner bottom wall of the accommodating cavity 110, thereby preventing the first housing cover 310 from contacting the winding core body 210 through the housing 100 to cause a short circuit. In order to prevent the core body 210 from contacting the second cover 330, a third insulating layer 250 is disposed between the core body 210 and the second tab 230 to prevent a short circuit caused by the contact of the second cover 330 with the core body 210.

Referring to fig. 2, in some embodiments, the button cell provided in this application further includes a first adhesive layer 600 and a second adhesive layer 700, where the first adhesive layer 600 covers a surface of the adapter assembly 400 facing away from the winding core body 210, and the ends of the first pin 412 and the second pin 422 are located outside the first adhesive layer 600, and the second adhesive layer 700 is enclosed on a side wall of the housing 100. Thus, the first and second

adhesive layers

600 and 700 may be used to fix the internal structure of the button cell and waterproof the button cell. In the following, a brief description will be given of an assembling process of the button cell, firstly, the annular adhesive layer 340 is attached between the first casing cover 310 and the second casing cover 330, the first casing cover 310, the annular adhesive layer 340 and the second casing cover 330 are adhered into a whole by hot pressing, then the second insulating layer 240 and the third insulating layer 250 are attached to two ends of the winding core body 210, after assembling, the winding core 200 is placed into the accommodating cavity 110, the casing 100 and the first tab 220 are connected by welding, and the second tab 230 and the second casing cover 330 are connected, then the positioning mounting groove 313 is matched with the end face of the casing 100, the first casing cover 310 and the casing 100 are connected by welding, after electrolyte is injected into the accommodating cavity 110 by the injection hole 120, the positioning boss 520 of the blocking member 500 is inserted into the first connecting section 121 to position, the second connecting section 122 is blocked by the body 510 of the blocking member 500, and one face of the body 510 facing away from the accommodating cavity 110 is connected with the outer wall of the casing 100 by welding, so as to complete the battery package. Then, the first insulating layer 320 is adhered to the countersunk portion 311, the second sheet 421 is welded to the conductive post 331, the first sheet 411 is welded to the boss 312, and finally the first adhesive layer 600 is adhered to the first sheet 411 and the second sheet 421, and the second adhesive layer 700 is adhered to the sidewall of the housing 100.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The button cell is characterized by comprising a shell, a winding core, a shell cover assembly and an adapter assembly, wherein a containing cavity is arranged in the shell, one end of the containing cavity is provided with an opening, and the winding core is contained in the containing cavity through the opening; the winding core comprises a winding core body, a first tab and a second tab, wherein the first tab and the second tab are connected to the winding core body, and the polarities of the first tab and the second tab are opposite;

the shell cover assembly is covered on the opening and comprises a first shell cover and a first insulating layer, the first shell cover is provided with a sinking platform part, and the first insulating layer is arranged on the sinking platform part; the switching subassembly includes first switching piece and second switching piece, first switching piece connect in first cap, with first utmost point ear intercommunication, the second switching piece is located first insulating layer deviate from roll up one side of core body, and with second utmost point ear intercommunication.

2. The button cell of claim 1, wherein the structure of the first cover that is not in the countersink forms a boss, a side of the boss facing away from the winding core body has a first end face, a side of the first insulating layer facing away from the winding core body has a second end face, and the first end face is flush with the second end face.

3. The button cell of claim 2, wherein the first housing cover is arc-shaped, and the ratio of the central angle of the boss to the central angle of the countersink is 1:1-1:3.

4. the button cell battery of claim 1, wherein a positioning and mounting groove is formed in one side of the first shell cover, which faces the accommodating cavity, and the groove bottom of the positioning and mounting groove is abutted to the end face of the shell, and one end of the first shell cover, which faces the accommodating cavity, is sunk into the accommodating cavity.

5. The button cell of claim 2, wherein the first tab comprises a first tab and a first pin connected to each other, the first tab is connected to the first end face, and the first pin is bent outward of the opening;

and/or, the second adapter piece comprises a second sheet body and a second pin which are mutually connected, the second sheet body is communicated with the second lug, and the second pin is bent towards the outer side of the opening.

6. The coin cell of claim 5 wherein the end face of the first sheet facing away from the jellyroll body is flush with the end face of the second sheet facing away from the jellyroll body.

7. The button cell of claim 5, wherein the first pin and the first plate are disposed at an included angle ranging from 80 ° to 120 °; the second pin and the first pin are arranged in parallel.

8. The coin cell of claim 5 wherein the projections of the first and second leads along the radial direction of the jellyroll body are each located within the first insulating layer.

9. The button cell of claim 5, wherein the ends of the first pin and the ends of the second pin are disposed at equal heights relative to the first insulating layer.

10. The button cell of any one of claims 1-9, further comprising a blocking member, wherein an end of the housing facing away from the opening is provided with a liquid injection hole, the blocking member closes the liquid injection hole, and an end surface of the blocking member facing away from the winding core body is flush with an outer wall of the housing.

11. The button cell of claim 10, wherein the closure comprises a body and a positioning boss connected to the body, the positioning boss protruding toward the winding core;

the liquid injection hole comprises a first communication section and a second communication section which are sequentially communicated from the inner side of the shell to the outer side of the shell, the aperture of the second communication section is larger than that of the first communication section, the positioning boss is inserted into the first communication section, and the body is arranged in the second communication section.

12. The button cell of any one of claims 1-9, wherein the cap assembly further comprises a second cap, the second cap being located on a side of the first cap facing the core, the second tab being electrically connected to the second rotation tab through the second cap.

13. The button cell of claim 12, wherein a side of the second cover facing away from the winding core body is provided with a conductive post, the first cover is provided with a hole for avoiding the conductive post, and the second adapter piece is connected to the conductive post.

14. The button cell of claim 13, wherein the cap assembly further comprises an annular adhesive layer, opposite sides of the annular adhesive layer being connected to the first cap and the second cap, respectively.

15. The button cell of any one of claims 5-9, further comprising a first adhesive layer covering a face of the adapter assembly facing away from the winding core body, wherein the ends of the first pin and the second pin are both located outside the first adhesive layer.