CN111082156B - Button cell and manufacturing method thereof - Google Patents

Button cell and manufacturing method thereof Download PDF

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Publication number
CN111082156B
CN111082156B CN201911397125.1A CN201911397125A CN111082156B CN 111082156 B CN111082156 B CN 111082156B CN 201911397125 A CN201911397125 A CN 201911397125A CN 111082156 B CN111082156 B CN 111082156B
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Prior art keywords
shell
winding body
negative electrode
positive electrode
upper shell
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CN111082156A (en
Inventor
吴建平
黄子欣
周开礼
吴永文
王雁斌
吴劲贤
刘双飞
吴荣鑫
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Zhangzhou Wanbao Energy Technology Co ltd
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Zhangzhou Wanbao Energy Technology Co ltd
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Priority to CN201911397125.1A priority Critical patent/CN111082156B/en
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Priority to PCT/CN2020/140108 priority patent/WO2021136163A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/005—Devices for making primary cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/04—Cells with aqueous electrolyte
    • H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
    • H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention provides a button cell and a manufacturing method thereof, which is characterized in that: the button cell comprises an upper shell and a lower shell which are covered, wherein a winding body is arranged between the lower shell and the upper shell, the winding body comprises a positive electrode plate, a negative electrode plate and an isolating body which is positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the winding body is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the winding body; the positive pole lug is connected with the positive pole piece, the negative pole lug is connected with the negative pole piece, at least one of the positive pole lug and the negative pole lug is electrically connected with the inner surface of the upper shell or the lower shell opposite to the upper end surface and the lower end surface of the winding body through a viscous conducting layer. The structure is beneficial to facilitating the connection of the lug of the button battery and the battery shell, the assembly efficiency is improved, and the manufacturing cost is saved by reducing welding equipment; but also can avoid the defective products caused by welding leakage and infirm welding.

Description

Button cell and manufacturing method thereof
The technical field is as follows:
the invention relates to a button cell and a manufacturing method thereof.
Background art:
button cells (button cells) are also called button cells, and refer to cells with the overall dimensions like a small button, generally speaking, the button cells have a larger diameter and a thinner thickness (compared with cylindrical cells such as a cell with a size of 5 AA on the market), the button cells are classified from the aspect of the appearance, and the equivalent corresponding cells are classified into cylindrical cells, square cells, special-shaped cells and the like.
The winder winding body in the button cell comprises a positive electrode plate, a negative electrode plate and an isolating body positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, the winding body is provided with a positive electrode lug and a negative electrode lug which extend above and below the winding body respectively, the positive electrode lug and the negative electrode lug are connected with the outer shell of the cell in the prior art by adopting a welding mode, the welding mode can play the aim of firm connection, but the welding is high in equipment cost, the design of an installation station and a tool occupies a certain space, the space between the welding lug and the inner surface of the outer shell of the cell is limited, the condition of welding leakage or infirm welding is easy to occur, in addition, the welding of the connected lug and the outer shell of the cell is realized, and the high temperature such as short circuit and the like are generated.
The invention content is as follows:
the invention aims to provide a button battery and a manufacturing method thereof, the button battery is reasonable in design, the connection between a lug of the button battery and a battery shell is facilitated, and the manufacturing cost is saved.
The specific embodiment of the invention is as follows: a button cell is characterized in that: the winding body comprises a positive electrode plate, a negative electrode plate and an isolating body positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the winding body is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the winding body; the positive pole lug is connected with the positive pole piece, the negative pole lug is connected with the negative pole piece, at least one of the positive pole lug and the negative pole lug is electrically connected with the inner surface of the upper shell or the lower shell opposite to the upper end surface and the lower end surface of the winding body through a viscous conducting layer.
Furthermore, the viscosity of the conductive layer with viscosity is gradually reduced along with the temperature in the battery is higher than 100 ℃, and the electrical connection between the positive electrode lug or the negative electrode lug and the inner surface of the upper shell or the lower shell is gradually disconnected.
Further, before assembling the upper case, the lower case and the winding body, at least one of the positive electrode tab and the negative electrode tab on the winding body is connected to the adhesive conductive layer, and then the winding body is placed inside the upper case or the lower case, and then the upper case and the lower case are compressed, i.e., the positive electrode tab or the negative electrode tab is electrically connected to the inner surface of the upper case or the lower case through the adhesive conductive layer.
Further, the adhesive conductive layer is an adhesive conductive adhesive layer, an adhesive conductive adhesive tape layer, an adhesive metal foil layer, a liquid metal layer or a low-temperature alloy layer.
Furthermore, the sticky conductive layer is sticky on one side, the length and/or width of the sticky conductive layer is larger than that of the tab, the sticky side is adhered with the tab, and the extended part is adhered to the inner surface of the upper shell or the lower shell.
Furthermore, the adhesive conductive layer is double-sided adhesive, and two adhesive surfaces are respectively adhered to the lug and the inner surface of the shell.
Furthermore, the upper surface and the lower surface of the winding body are provided with insulation plates in an attached mode, an insulation sleeve is sleeved on the outer peripheral wall of the upper shell, the lower portion of the insulation sleeve is bent and wrapped on the lower portion of the inner peripheral wall of the upper shell, and the inner peripheral wall of the lower shell is in press fit with the outer periphery of the insulation sleeve; the positive electrode tab and the negative electrode tab are electrically connected with the inner surface of the upper shell or the lower shell through a viscous conducting layer; at least one of the inner surfaces of the upper shell or the lower shell, which is opposite to the upper end surface and the lower end surface of the winding body, is provided with a concave notch groove which is not formed into a ring shape.
The invention discloses a manufacturing method of a button battery, which is characterized by comprising the following steps: the button cell comprises an upper shell and a lower shell which are covered, wherein a winding body is arranged between the lower shell and the upper shell, the winding body comprises a positive electrode plate, a negative electrode plate and an isolating body which is positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the winding body is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the winding body; the positive electrode tab is connected with the positive electrode plate, the negative electrode tab is connected with the negative electrode plate, and at least one of the positive electrode tab and the negative electrode tab is electrically connected with the inner surface of the upper shell or the lower shell through a viscous conducting layer; the manufacturing steps are as follows: 1) preparing an upper shell, a lower shell and a winding body, 2) bonding a sticky conductive layer with a positive electrode tab and/or a negative electrode tab, 3) placing the winding body into the upper shell or the lower shell, and injecting liquid into the upper shell or the lower shell; 4) and the upper shell and the lower shell are relatively covered and compressed, so that the positive pole lug or the negative pole lug is electrically connected with the inner surface of the upper shell or the lower shell through the viscous conducting layer.
When the tab is connected with the sticky conductive layer, the sticky side is firstly adhered with the tab, and then the part of the sticky conductive layer, which grows out, is adhered to the inner surface of the upper shell or the lower shell.
Further, when the conductive layer having adhesiveness is double-sided adhesive, the two adhesive surfaces are respectively adhered to the tab and the inner surface of the case.
Compared with the prior art, the invention has the following beneficial effects: the structure is beneficial to facilitating the connection of the lug of the button battery and the battery shell, the assembly efficiency is improved, and the manufacturing cost is saved by reducing welding equipment; but also can avoid the defective products caused by welding leakage and infirm welding.
Description of the drawings:
fig. 1 is a schematic view showing a sectional configuration of an example of the present invention (only a positive electrode tab is connected to the inner face of a case through an adhesive conductive layer, and the adhesive conductive layer is adhesive on one side);
FIG. 2 is a schematic view of a second cross-sectional configuration of an embodiment of the present invention (only the positive electrode tab is connected to the inside of the case through the adhesive conductive layer, both sides of which are adhesive);
fig. 3 is a schematic diagram of a three-section configuration of an example of the present invention (positive and negative electrode tabs are connected to the inside of a case through an adhesive conductive layer, and the adhesive conductive layer is adhesive on one side);
FIG. 4 is a schematic diagram of a four-section configuration of an example of the invention (positive and negative electrode tabs are attached to the inside of the casing by an adhesive conductive layer that is adhesive on both sides);
fig. 5 is a schematic perspective view of the connection structure of the roll body and the conductive layer with viscosity (the conductive layer with viscosity is on one side);
FIG. 6 is a perspective view of the connection of the wound body and the conductive layer having adhesive properties (the conductive layer having adhesive properties on both sides);
FIG. 7 is a schematic view showing a three-dimensional structure of a connection in an assembled state of a roll and a conductive layer having adhesiveness (a cross section of the roll);
FIG. 8 is a schematic cross-sectional configuration of one embodiment of the housing;
FIG. 9 is a top view of FIG. 8;
fig. 10 is an enlarged view of a portion K of fig. 8.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The button cell comprises an upper shell 1 and a lower shell 2 which are covered, wherein a winding body 3 is arranged between the lower shell 2 and the upper shell 1, the winding body 3 comprises a positive electrode plate 301, a negative electrode plate 302 and an isolating body 303 which is positioned between the positive electrode plate 301 and the negative electrode plate 302 and used for isolating the positive electrode plate and the negative electrode plate, and the winding body 3 is provided with a positive electrode lug 4 and a negative electrode lug 5 which respectively extend towards the upper part and the lower part of the winding body; the positive electrode tab 4 is connected with the positive electrode plate 301, the negative electrode tab 5 is connected with the negative electrode plate 302, and at least one of the positive electrode tab and the negative electrode tab is electrically connected with the inner surface 7, opposite to the upper end surface and the lower end surface of the winding body, of the upper shell or the lower shell through the viscous conducting layer 6.
The wall bodies of the upper shell and the lower shell opposite to the upper end surface and the lower end surface of the winding body are plane bodies, and the pole lugs and the sticky conducting layer are flatly attached to the inner surface 7.
When the button cell is in short circuit or damaged, the temperature and pressure in the button cell can be increased greatly due to high current and other reasons, when this internal temperature is increased gradually, the viscosity of the conductive layer 6 having viscosity is decreased (which is a property of hot melt glue having a softening point of 110 c plus or minus 10 c), meanwhile, under the action of internal pressure, the upper shell and/or the lower shell can be arched outwards, under the condition that the internal pressure continues to rise, the relative distance between the upper shell and the lower shell is increased until the upper shell and the lower shell are completely separated and even burst, during incomplete separation, the positive electrode tab 4 and/or the negative electrode tab 5 is relatively separated from the inner surface 7 of the upper case or the lower case, thereby generating open circuit in the button cell and avoiding the continuous rise of the temperature and the pressure in the cell; the separation at the connecting position of the positive electrode tab 4 and/or the negative electrode tab 5 and the inner surface 7 of the upper shell or the lower shell is a gradual process (the internal pressure is slowly increased), namely, the tab is electrically contacted with the inner surface of the shell in a large area to be electrically contacted in a small area, the section of the circuit connection is reduced in the process, the resistance is increased, the current is reduced under the same voltage condition, and the increase of the internal pressure and the temperature of the battery is reduced; therefore, this application has sticky conducting layer and progressively reduces along with the battery inside temperature is higher than behind 100 degrees centigrade viscidity, progressively breaks off anodal utmost point ear or negative pole utmost point ear and last casing or the inner face's of lower casing electric connection, has realized button cell electric connection under the normal use condition, and the protection of cutting off when button cell is inside to appear unusually is favorable to guaranteeing the security that button cell used.
When the button battery is assembled at present, the lugs and the inner surface of the shell are fixed by welding, so that the lengths of the two lugs are required to be made longer (at least larger than the radius of a winding body) so as to enable a welding needle to extend into the lug and the inner surface of the shell to weld the lugs; this application is at the equipment casing, casing and winding body before, at least one of anodal utmost point ear and the negative pole utmost point ear on the winding body is connected with having sticky conducting layer earlier (anodal utmost point ear and negative pole utmost point ear also can have sticky conducting layer with two respectively), put into the winding body after the internal portion of casing or inferior valve and annotate the liquid, will go up casing and inferior valve body compression, even anodal utmost point ear or negative pole utmost point ear through having sticky conducting layer and the internal face electric connection of casing or inferior valve body, the assembly method of this application, need not welding equipment, welding frock and welded station, be favorable to guaranteeing the fastness of utmost point ear and casing or the internal face of casing down being connected and avoid omitting the welding.
When one of the positive electrode tab and the negative electrode tab on the winding body is not connected with the inner surface 7 of the shell through the sticky conducting layer, and the other one is connected with the inner surface of the shell through the sticky conducting layer, the assembly process is as follows: a pole lug of a winding body is connected with a viscous conductive layer, the winding body is placed in a shell (wherein the pole lug which is not connected with the viscous conductive layer faces the inner surface of the shell), a welding pin penetrates through a central hole 11 of the winding body, the pole lug is welded on the inner surface of the shell, then liquid is injected, the other shell is covered and pressed, and the pole lug connected with the viscous conductive layer is electrically connected with the inner surface of the shell.
For reliable connection, the conductive layer with viscosity is a conductive adhesive layer with viscosity, a conductive adhesive tape layer with viscosity, a metal foil layer with viscosity, a liquid metal layer or a low-temperature alloy layer, the conductive adhesive layer with viscosity is conductive glue or conductive silver glue, such as 'Shenggelu' brand 8800 conductive glue, the conductive adhesive tape layer can be 'you sheng' brand conductive adhesive tape and the like, the metal foil layer with viscosity can be 'mioleqi' brand double-conductive copper thin adhesive tape or 'baojiasheng' brand aluminum foil adhesive tape and the like, the conductive layer with viscosity has better conductivity, and the resistance of the conductive layer with viscosity is less than 0.002 omega/square millimeter.
The viscosity of the conductive layer with viscosity in the present application is not completely realized by glue, and may be the viscosity of the substance itself, or the viscosity of the substance itself in different states, and the conductive adhesive layer, the conductive adhesive tape layer, and the metal foil layer may have viscosity due to the glue, and the conductive adhesive layer itself has viscosity, and the liquid metal layer and the low temperature alloy layer have viscosity or do not have viscosity in different states.
The liquid metal layer may be a modified gallium indium tin alloy, and the low-temperature alloy layer may be some alloy with the following components, and the alloy with the melting point of 50-100 ℃ may be selected.
Figure DEST_PATH_IMAGE002
The liquid metal layer or the low-temperature alloy layer is solid and flaky at normal temperature, and is connected between the lug and the inner surface of the shell body in the use process, or the liquid metal layer and the low-temperature alloy layer are arranged on the insulating base material layer (non-conductive plastic layer) and are attached to the opposite surfaces of the lug and the inner surface of the shell body; and after the internal fault of the button battery generates high temperature higher than 100 ℃, the liquid metal layer or the low-temperature alloy layer can be melted to form liquid, the electric connection between the lug and the outer shell can be disconnected, the electric connection of the button battery under the normal use condition is realized, the button battery is cut off and protected when abnormal conditions occur inside, and the use safety of the button battery is ensured.
In one embodiment, when the conductive layer with adhesiveness is single-sided adhesive, the length and/or width of the conductive layer with adhesiveness is greater than that of the tab, when the tab is connected with the conductive layer with adhesiveness, the tab is adhered to the adhesive side, and then the part of the conductive layer with adhesiveness is adhered to the inner surface of the upper shell or the lower shell (as shown in fig. 1, 5 and 7).
In one embodiment, when the above-mentioned adhesive conductive layer is double-sided adhesive, the electrode tab and the inner surface 7 of the case are respectively adhered to both adhesive surfaces, and the size of the adhesive conductive layer side is not particularly limited, and may be larger than, equal to or smaller than the electrode tab (as shown in fig. 2 and 6), but the adhesive conductive layer is preferably slightly larger than the electrode tab, and is schematically shown in the drawings, but the size of the electrode tab, the adhesive conductive layer, and the like actually used is not shown, and when the double-sided adhesive conductive layer is used, the insulating plate 8 is used.
The above-mentioned single-sided adhesive is an embodiment in which the liquid metal layer or the low-temperature alloy layer is disposed on the insulating substrate layer (non-conductive plastic layer) and attached to the opposite surfaces of the tab and the inner surface of the outer case, and the double-sided adhesive is an embodiment in which the liquid metal layer or the low-temperature alloy layer is disposed between the tab and the inner surface of the outer case.
Furthermore, the upper surface and the lower surface of the winding body 3 are provided with insulation plates 8 in an adhering mode, the insulation plates 8 are used for preventing the winding body 3 from being conducted with the inner surface 7 of the shell, the electrode lugs are flatly adhered between the insulation plates 8 and the inner surface 7 of the shell, and under the condition that the inner surface of the shell is a plane, the effect of adhering the electrode lugs to the inner surface of the shell for electrical connection is good.
The peripheral wall of the upper shell is sleeved with an insulating sleeve 9, the lower part of the insulating sleeve is bent and coated on the lower part of the peripheral wall of the upper shell, the peripheral wall of the lower shell 2 is pressed on the periphery of the insulating sleeve 9 in a press fit mode, and the insulating sleeve 9 is used for electrically insulating and sealing the upper shell and the lower shell.
In order to apply a certain pressure on the sticky conductive layer and the pole lug by the winding body in the pressing process, the heights of the winding body, the sticky conductive layer, the pole lug and the insulating plate are slightly larger than the distance between the inner surfaces of the two shells.
Further, the positive electrode tab and the negative electrode tab can be electrically connected with the inner surface 7 of the upper shell or the lower shell through a sticky conductive layer; the upper or lower shell and the winding body have flat or concave or convex arc surfaces relative to the upper or lower surface, but adopt a shape structure with a flat surface commonly used by button batteries.
Further, in order to realize the explosion prevention of the button cell, at least one of the inner surfaces 7 of the upper case or the lower case opposite to the upper end surface and the lower end surface of the winding body is provided with a concave engraved groove 10 which is not formed into a ring shape, the concave engraved groove 10 forms an unclosed curve on the case, the curve can form a ring shape after extending, the ring shape can be rectangular, circular or elliptical, the ring area formed after extending the curve accounts for 80-90% of the inner surface area of the cross section of the upper case or the lower case, when the pressure in the button cell is increased and reaches a certain value, the upper case or the lower case can be arched, then the distance between the upper case and the lower case is increased until the upper case or the lower case is separated, even burst, and when burst, the personnel can be damaged, therefore, the pressure relief is realized before burst, when the internal pressure of the button cell reaches 1.0-1.5MPa through the unclosed annular concave engraved groove 10, the button cell can be flushed locally, the internal pressure is discharged, and because the concave notch 10 is not closed to form a ring, the punched piece is connected to the shell, so that the personnel injury is avoided; for the tab connected with the conductive layer 6 with viscosity, the position of the tab connected with the conductive layer is close to the concave notch 10, because the concave notch 10 is relatively close to the outer periphery of the shell, the tab connected with the winding body is generally close to the edge of the winding body, the tab can be made shorter, the material can be saved, and the position of the tab connected with the inner surface of the shell is also close to the edge and is close to the inner side of the concave notch 10.
The invention relates to a manufacturing method of a button battery, which comprises an upper shell and a lower shell which are covered, wherein a winding body is arranged between the lower shell and the upper shell, the winding body comprises a positive electrode plate, a negative electrode plate and an isolating body which is positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the winding body is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the winding body; the positive electrode tab is connected with the positive electrode plate, the negative electrode tab is connected with the negative electrode plate, and at least one of the positive electrode tab and the negative electrode tab is electrically connected with the inner surface 7 of the upper shell or the lower shell through a viscous conducting layer; the manufacturing steps are as follows: 1) preparing an upper shell, a lower shell and a winding body, 2) bonding a sticky conductive layer with a positive electrode tab and/or a negative electrode tab, 3) placing the winding body into the upper shell or the lower shell, and injecting liquid into the upper shell or the lower shell; 4) the upper shell and the lower shell are relatively covered and compressed, so that the positive pole lug or the negative pole lug is electrically connected with the inner surface 7 of the upper shell or the lower shell through the viscous conducting layer.
When the tab is connected with the sticky conductive layer, the sticky side is firstly adhered with the tab, and then the part of the sticky conductive layer, which grows out, is adhered to the inner surface of the upper shell or the lower shell.
Further, when the conductive layer having adhesiveness is double-sided adhesive, the two adhesive surfaces are respectively adhered to the tab and the inner surface of the case.
Compared with the prior art, the invention has the following beneficial effects: the structure is beneficial to facilitating the connection of the lug of the button battery and the battery shell, the assembly efficiency is improved, and the manufacturing cost is saved by reducing welding equipment; but also can avoid the defective products caused by welding leakage and infirm welding.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (4)

1. A button cell is characterized in that: the winding body comprises a positive electrode plate, a negative electrode plate and an isolating body positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the winding body is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the winding body; the positive electrode tab is connected with the positive electrode plate, the negative electrode tab is connected with the negative electrode plate, and at least one of the positive electrode tab and the negative electrode tab is electrically connected with the inner surface of the upper shell or the lower shell opposite to the upper end surface and the lower end surface of the winding body through a viscous conducting layer; the sticky conductive layer is single-sided sticky, the length and/or the width of the sticky conductive layer are/is larger than those of the tabs, the sticky side is adhered with the tabs, and meanwhile, the grown part is adhered to the inner surface of the upper shell or the lower shell, which is opposite to the upper end surface and the lower end surface of the winding body; before assembling the upper shell, the lower shell and the winding body, respectively connecting a positive electrode tab and a negative electrode tab on the winding body with two sticky conductive layers, then placing the winding body into the upper shell or the lower shell and injecting liquid, and pressing the upper shell and the lower shell tightly, namely electrically connecting the positive electrode tab and the negative electrode tab with the inner surface of the upper shell or the lower shell through the sticky conductive layers; the viscosity of the conductive layer with viscosity is gradually reduced along with the temperature in the battery is higher than 100 ℃, and the positive electrode lug or the negative electrode lug is gradually disconnected from the inner surface of the upper shell or the lower shell opposite to the upper end surface and the lower end surface of the winding body; the conductive layer with viscosity is a conductive adhesive layer with viscosity, a conductive adhesive tape layer with viscosity, a metal foil layer with viscosity, a liquid metal layer or a low-temperature alloy layer; insulation plates are attached to the upper surface and the lower surface of the winding body, an insulation sleeve is sleeved on the outer peripheral wall of the upper shell, the lower portion of the insulation sleeve is bent and coated on the lower portion of the inner peripheral wall of the upper shell, and the inner peripheral wall of the lower shell is in press fit with the periphery of the insulation sleeve; the positive electrode tab and the negative electrode tab are electrically connected with the inner surface of the upper shell or the lower shell through a viscous conducting layer; at least one of the inner surfaces of the upper shell or the lower shell, which is opposite to the upper end surface and the lower end surface of the winding body, is provided with a concave notch groove which is not formed into a ring shape.
2. The button cell of claim 1, wherein: the conductive layer with viscosity is double-sided tape viscosity, and two surfaces with viscosity are respectively adhered to the lug and the inner surface of the shell.
3. A manufacturing method of a button battery is characterized by comprising the following steps: the button cell comprises an upper shell and a lower shell which are covered, wherein a winding body is arranged between the lower shell and the upper shell, the winding body comprises a positive electrode plate, a negative electrode plate and an isolating body which is positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the winding body is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the winding body; the positive electrode tab is connected with the positive electrode plate, the negative electrode tab is connected with the negative electrode plate, and at least one of the positive electrode tab and the negative electrode tab is electrically connected with the inner surface of the upper shell or the lower shell opposite to the upper end surface and the lower end surface of the winding body through a viscous conducting layer; the sticky conductive layer is single-sided sticky, the length and/or the width of the sticky conductive layer are/is larger than those of the tabs, the sticky side is adhered with the tabs, and meanwhile, the grown part is adhered to the inner surface of the upper shell or the lower shell, which is opposite to the upper end surface and the lower end surface of the winding body; before assembling the upper shell, the lower shell and the winding body, respectively connecting a positive electrode tab and a negative electrode tab on the winding body with two sticky conductive layers, then placing the winding body into the upper shell or the lower shell and injecting liquid, and pressing the upper shell and the lower shell tightly, namely electrically connecting the positive electrode tab and the negative electrode tab with the inner surface of the upper shell or the lower shell through the sticky conductive layers; the viscosity of the conductive layer with viscosity is gradually reduced along with the temperature in the battery is higher than 100 ℃, and the positive electrode lug or the negative electrode lug is gradually disconnected from the inner surface of the upper shell or the lower shell opposite to the upper end surface and the lower end surface of the winding body; the conductive layer with viscosity is a conductive adhesive layer with viscosity, a conductive adhesive tape layer with viscosity, a metal foil layer with viscosity, a liquid metal layer or a low-temperature alloy layer; insulation plates are attached to the upper surface and the lower surface of the winding body, an insulation sleeve is sleeved on the outer peripheral wall of the upper shell, the lower portion of the insulation sleeve is bent and coated on the lower portion of the inner peripheral wall of the upper shell, and the inner peripheral wall of the lower shell is in press fit with the periphery of the insulation sleeve; the positive electrode tab and the negative electrode tab are electrically connected with the inner surface of the upper shell or the lower shell through a viscous conducting layer; at least one of the inner surfaces of the upper shell or the lower shell, which are opposite to the upper end surface and the lower end surface of the winding body, is provided with a concave notch which is not formed into a ring shape; the manufacturing steps are as follows: 1) preparing an upper shell, a lower shell and a winding body, 2) bonding a viscous conductive layer with a positive electrode tab and a negative electrode tab, 3) placing the winding body into the upper shell or the lower shell, and injecting liquid into the upper shell or the lower shell; 4) the upper shell and the lower shell are relatively covered and compressed, so that the positive pole lug or the negative pole lug is electrically connected with the inner surface of the upper shell or the lower shell, which is opposite to the upper end surface and the lower end surface of the winding body, through the viscous conducting layer.
4. The manufacturing method of the button cell as claimed in claim 3, wherein: and when the conductive layer with viscosity is double-sided tape viscosity, two surfaces with viscosity are respectively adhered with the lug and the inner surface of the shell.
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