CN111048730A - Internal connection structure of button cell and manufacturing method thereof - Google Patents
Internal connection structure of button cell and manufacturing method thereof Download PDFInfo
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- CN111048730A CN111048730A CN201911394407.6A CN201911394407A CN111048730A CN 111048730 A CN111048730 A CN 111048730A CN 201911394407 A CN201911394407 A CN 201911394407A CN 111048730 A CN111048730 A CN 111048730A
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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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
- H01M6/00—Primary cells; Manufacture thereof
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- 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
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- 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 an internal connection structure of a button cell and a manufacturing method thereof, which is characterized in that: the internal connection structure of the button cell comprises an upper shell and a lower shell which are covered, 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 structure is utilized to facilitate the connection of the tab of the button cell and the cell shell, the assembly efficiency is improved, and the manufacturing cost is saved by reducing welding equipment; and defective products caused by missing welding and incomplete welding can be avoided.
Description
The technical field is as follows:
the invention relates to an internal connection structure of a button cell and a manufacturing method thereof.
Background art:
the button cell is a cell with the external dimension like a small button, generally, the diameter is larger, the thickness is thinner (compared with a columnar cell such as a cell with No. 5 AA on the market), the button cell is divided from the external aspect, and the equivalent corresponding cells are classified into a columnar cell, a square cell, a special-shaped cell and the like.
The winding body in the button cell 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, wherein 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 a cell shell in 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 of the welding lug and the inner surface of the cell shell is limited, the condition of welding leakage or welding failure is easy to occur, in addition, the welding lug and the cell shell are welded, and the high-temperature and high-pressure phenomena such as short circuit and the like occur inside the cell, and the disconnection cannot be.
The invention content is as follows:
the invention aims to provide an internal connecting structure of a button cell and a manufacturing method thereof, wherein the internal connecting structure of the button cell is reasonable in design, and is beneficial to facilitating the assembly of the button cell, improving the work efficiency and saving the manufacturing cost.
The specific embodiment of the invention is as follows: the utility model provides an internal connection structure of button cell which 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 liquid metal layer or a low-temperature alloy layer; the pole ear and the liquid metal layer or the low-temperature alloy layer are flatly close to the inner face.
Furthermore, before assembling the upper shell, the lower shell and the winding body, the anode tab and the cathode tab are flatly attached to the end face of the winding body, at least one of the anode tab and the cathode tab on the winding body is firstly attached to the liquid metal layer or the low-temperature alloy layer, then the winding body is placed into the upper shell or the lower shell for liquid injection, the upper shell and the lower shell are pressed tightly, and then the anode tab or the cathode tab is electrically connected with the inner face of the upper shell or the lower shell through the liquid metal layer or the low-temperature alloy layer.
Furthermore, the viscosity of the liquid metal layer or the low-temperature alloy layer is gradually reduced or loses the viscosity along with the temperature inside the battery higher than 90 ℃, and the positive pole lug or the negative pole lug is 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.
Furthermore, the back of the liquid metal layer or the low-temperature alloy layer is provided with an insulating substrate layer, the length and/or the width of the liquid metal layer or the low-temperature alloy layer are/is larger than that of the tab, and the liquid metal layer or the low-temperature alloy layer is adhered to the tab and the extended part is adhered to 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.
Furthermore, the liquid metal layer or the low-temperature alloy layer is respectively adhered to the lug and the inner surface of the shell.
Furthermore, insulation plates are attached to the upper and lower surfaces of the winding body.
Furthermore, an insulating sleeve is sleeved on the outer peripheral wall of the upper shell, the lower part of the insulating sleeve is bent and coated on the lower part of the inner peripheral wall of the upper shell, and the inner peripheral wall of the lower shell is press-fitted on the outer periphery of the insulating sleeve; the positive pole lug and the negative pole lug are electrically connected with the inner surface of the upper shell or the lower shell through the liquid metal layer or the low-temperature alloy layer.
Furthermore, 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 groove which is not formed into a ring shape.
The invention relates to a method for manufacturing an internal connection structure of a button cell, which is characterized by comprising the following steps: the internal connection structure of the button cell comprises an upper shell and a lower shell which are covered, 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 liquid metal layer or a low-temperature alloy layer; the pole ear and the liquid metal layer or the low-temperature alloy layer are flatly adhered to the inner surface, and the manufacturing steps are as follows: 1) preparing an upper shell, a lower shell and a winding body, 2) flatly attaching a positive electrode tab and a negative electrode tab to the end face of the winding body, and attaching at least one of the positive electrode tab and the negative electrode tab on the winding body to a liquid metal layer or a low-temperature alloy layer, 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 liquid metal layer or the low-temperature alloy layer.
Furthermore, when only the first tab on the upper and lower end surfaces of the winding body is electrically connected by the inner surfaces of the liquid metal layer or the low-temperature alloy layer, firstly, the winding body is put into a second shell, then a second tab is welded and fixed with the inner surface of the second shell, then liquid is injected into the second shell, then the first pole ear and the liquid metal layer or the low temperature alloy layer are flatly close to the end face of the winding body (the liquid metal layer or the low temperature alloy layer is positioned between the pole ear and the inner surface of the shell, or the liquid metal layer and the low temperature alloy layer are arranged on the insulating base material layer and are attached to the back faces of the pole ear and the inner surface of the shell), after the two shells are covered, namely, the liquid metal layer or the low-temperature alloy layer can reach the melting point on the outer surface of the first shell through heat conduction and then is cooled, even if the tab is connected and fixed with the inner surface of the first shell through the liquid metal layer or the low-temperature alloy layer, the electrical connection between the tab and the shell is realized; when the first and second lugs on the upper and lower end faces of the winding body are both made of liquid metal layers or low-temperature alloy layers and the inner faces are electrically connected, the first and second lugs and the liquid metal layers or the low-temperature alloy layers are flatly close to the end faces of the winding body (the liquid metal layers or the low-temperature alloy layers are positioned between the lugs and the inner face of the shell, or the liquid metal layers and the low-temperature alloy layers are arranged on the insulating substrate layer and are attached to the back faces of the lugs and the inner face of the shell), then the winding body is placed into the first shell and then injected into the first shell, then the two shells are covered, namely the liquid metal layers or the low-temperature alloy layers can reach the melting point on the outer surfaces of the first and second shells through heat conduction, and then the two lugs are cooled again, even if the first and second lugs are fixedly connected with the inner.
Compared with the prior art, the invention has the following beneficial effects: the invention is beneficial to facilitating the connection of the tab of the button cell and the cell shell by utilizing the structure, improving the assembly efficiency and saving the manufacturing cost by reducing welding equipment; and defective products caused by missing welding and incomplete welding can be avoided.
Description of the drawings:
fig. 1 is a schematic cross-sectional structure of an embodiment of the present invention (only the positive electrode tab is connected to the inner surface of the case through the liquid metal layer or the low temperature alloy layer, and the liquid metal layer and the low temperature alloy layer are attached to the opposite surfaces of the tab and the inner surface of the case);
fig. 2 is a schematic view of a two-section configuration of an example of the invention (only the positive electrode tab is connected to the inside of the case by a liquid metal or low temperature alloy layer, the liquid metal or low temperature alloy layer being located between the tab and the inside of the case);
fig. 3 is a schematic diagram of a three-section structure of an example of the invention (a positive electrode tab and a negative electrode tab are connected with the inner surface of a shell through a liquid metal layer or a low-temperature alloy layer, and the liquid metal layer and the low-temperature alloy layer are attached to the opposite surfaces of the tabs and the inner surface of the shell);
fig. 4 is a schematic illustration of a four-section configuration of an example of the invention (positive and negative electrode tabs are connected to the inside of the casing by a liquid metal or low temperature alloy layer located between the tabs and the inside of the casing);
fig. 5 is a schematic perspective view of the connection structure of the wound body and the liquid metal layer or the low-temperature alloy layer (the liquid metal layer and the low-temperature alloy layer are attached to the opposite sides of the tab and the inner surface of the housing);
fig. 6 is a schematic perspective view of the connection of the jelly roll with the liquid metal layer or the low temperature alloy layer (the liquid metal layer or the low temperature alloy layer is located between the tab and the inner surface of the case);
FIG. 7 is a schematic view showing a three-dimensional structure of a connection structure of a wound body and a liquid metal layer or a low-temperature alloy layer in an assembled state (the wound body is sectioned);
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 internal connection structure of the button cell comprises an upper shell 1 and a lower shell 2 which are covered, a winding body 3 is arranged between the lower shell 2 and the upper shell 1, the winding body 3 is in a cylindrical shape, 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 tab 4 and a negative electrode tab 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 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 liquid metal layer or the low-temperature alloy 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 inner surface pole ear and the liquid metal layer or the low-temperature alloy layer are flatly close to the inner surface 7.
The liquid metal layer may be a gallium indium tin alloy, and the low temperature alloy layer may be some of the alloys having the following compositions, and may be selected to have a melting point of 50-100 degrees celsius.
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 90 ℃, 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 favorably ensured.
When the button cell is in short circuit or damaged, the temperature and pressure in the button cell are increased due to high current, when the internal temperature is gradually increased, the liquid metal layer or the low-temperature alloy layer is changed from solid to liquid, so that the connection between the tab and the inner surface of the shell is reduced or completely realized, a circuit in the button cell is disconnected, the upper shell and/or the lower shell are arched outwards under the action of internal pressure, the relative distance between the upper shell and the lower shell is increased under the condition that the internal pressure is continuously increased until the upper shell and the lower shell are completely separated or even exploded, and the position where the positive tab 4 and/or the negative tab 5 are connected with the inner surface 7 of the upper shell or the lower shell is relatively separated during incomplete separation, so as to further separate the tab from the inner surface of the shell, 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, after the internal temperature of the battery is higher than 90 ℃ (or at a certain temperature), the liquid metal layer or the low-temperature alloy layer gradually disconnects 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, so that the electrical connection of the button battery under the normal use condition is realized, the button battery is cut off and protected when abnormality occurs inside the button battery, and the use safety of the button battery is ensured.
When the button cell is assembled at present, the lug and the inner surface of the shell are fixed by welding, so that the length of the two lugs is required to be made longer (at least larger than the radius of a winding body) to ensure that a welding gun can extend into the lug and the inner surface of the shell to be welded.
The assembly process of the application:
when only the first tab on the upper and lower end surfaces of the winding body is electrically connected by using the inner surfaces of the liquid metal layer or the low-temperature alloy layer, firstly, the winding body is put into a second shell, then a second tab is welded and fixed with the inner surface of the second shell, then liquid is injected into the second shell, then the first pole ear and the liquid metal layer or the low temperature alloy layer are flatly close to the end face of the winding body (the liquid metal layer or the low temperature alloy layer is positioned between the pole ear and the inner surface of the shell, or the liquid metal layer and the low temperature alloy layer are arranged on the insulating base material layer and are attached to the back faces of the pole ear and the inner surface of the shell), after the two shells are covered, namely, the liquid metal layer or the low-temperature alloy layer can reach the melting point on the outer surface of the first shell through heat conduction and then is cooled, even if the tab is connected and fixed with the inner surface of the first shell through the liquid metal layer or the low-temperature alloy layer, the electrical connection between the tab and the shell is realized; when the first and second lugs on the upper and lower end faces of the winding body are both made of liquid metal layers or low-temperature alloy layers and the inner faces are electrically connected, the first and second lugs and the liquid metal layers or the low-temperature alloy layers are flatly close to the end faces of the winding body (the liquid metal layers or the low-temperature alloy layers are positioned between the lugs and the inner face of the shell, or the liquid metal layers and the low-temperature alloy layers are arranged on the insulating substrate layer and are attached to the back faces of the lugs and the inner face of the shell), then the winding body is placed into the first shell and then injected into the first shell, then the two shells are covered, namely the liquid metal layers or the low-temperature alloy layers can reach the melting point on the outer surfaces of the first and second shells through heat conduction, and then the two lugs are cooled again, even if the first and second lugs are fixedly connected with the inner.
In the above-mentioned assembly process of this application, all adopt liquid metal layer or low temperature alloy-layer and casing internal face to be connected for two sides utmost point ear when the winding body, need not welding equipment, welding frock and welded station promptly, be favorable to guaranteeing utmost point ear and casing or the internal face of casing down and be connected the fastness and avoid omitting the welding.
When one of the positive pole lug and the negative pole lug on the winding body is connected with the inner surface 7 of the shell through the liquid metal layer or the low-temperature alloy layer instead of the other one, the other one is connected with the inner surface of the shell through the liquid metal layer or the low-temperature alloy layer, and the assembly process is as follows: the method comprises the steps of connecting a liquid metal layer or a low-temperature alloy layer to one tab of a winding body, placing the winding body into a shell (wherein the tab which is not connected with the liquid metal layer or the low-temperature alloy layer faces the inner face of the shell), penetrating a central hole 11 of the winding body through a welding needle, welding the tab to the inner face of the shell, injecting liquid, covering another shell, and pressing, wherein the tab connected with the liquid metal layer or the low-temperature alloy layer is electrically connected with the inner face of the shell by adopting heat conduction from the outside of the shell.
The liquid metal layer or the low-temperature alloy layer can also be a sticky conductive adhesive layer, a sticky conductive adhesive tape layer and a sticky metal foil layer, the sticky conductive adhesive layer is conductive glue or conductive silver glue, such as 'Shenggelu' brand 8800 conductive adhesive, the conductive adhesive tape layer can be 'you sheng' brand conductive adhesive tape and the like, the sticky metal foil layer can be 'mie le qi' brand double-conductive copper thin adhesive tape or 'bao jia sheng' brand aluminum foil adhesive tape and the like, the liquid metal layer or the low-temperature alloy layer has good conductivity, and the resistance of the liquid metal layer or the low-temperature alloy layer is less than 0.002 omega/square millimeter.
The back of the liquid metal layer or the low-temperature alloy layer is provided with an insulating base material layer, the length and/or the width of the liquid metal layer or the low-temperature alloy layer is larger than that of the pole ear, the liquid metal layer or the low-temperature alloy layer is adhered to the pole ear, and meanwhile, the extended part is adhered to the inner face (shown in figures 1, 5 and 7) of the upper shell or the lower shell, which is opposite to the upper end face and the lower end face of the winding body, the insulating base material layer can be made of a plastic thin material, so that an insulating plate 8 with an isolating function is not needed, the material cost is further saved, and.
In one embodiment, the liquid metal layer or the low temperature alloy layer is located between the tab and the inner surface of the housing, and the size of the liquid metal layer or the low temperature alloy layer is not particularly required, and may be greater than, equal to or smaller than the tab (as shown in fig. 2 and 6), but the liquid metal layer or the low temperature alloy layer is slightly larger than the tab, preferably, the liquid metal layer or the low temperature alloy layer is schematically drawn and does not represent the actual size of the tab, the liquid metal layer or the low temperature alloy layer, and the insulating plate 8 is required when the liquid metal layer or the low temperature alloy layer is located between the tab and the.
Furthermore, the insulation plates 8 are arranged on the upper end surface and the lower end surface of the winding body 3, 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 pasted between the insulation plates 8 and the inner surface 7 of the shell, and the effect of pasting the electrode lugs with the inner surface of the shell for electrical connection is good under the condition that the inner surface of the shell is a plane.
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 liquid metal layer or the low-temperature alloy layer and the pole lug by the winding body in the compressing process, the heights of the winding body, the liquid metal layer or the low-temperature alloy layer, the pole lug and the insulating plate are slightly larger than the distance between the inner surfaces of the two shells.
Furthermore, 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 liquid metal layer or a low-temperature alloy layer; the upper or lower shell and the winding body have flat or concave or convex wall, but the flat surface is the common shape structure of button cell.
Further, in order to realize the explosion-proof 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 rectangle, circle or ellipse, 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 is arched outwards, the distance between the upper case and the lower case is increased until the upper case or the lower case is separated, even the button cell is exploded, when the button cell is exploded, the personnel can be damaged, therefore, the pressure relief is realized before the button cell is exploded, when the internal pressure of the button cell reaches 1.0-1.5Mpa through the concave engraved groove 10 which, 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 pole ear that has the connection liquid metal layer or low temperature alloy-layer 6, its position of connecting at the casing is close to concave notch 10, because concave notch 10 is comparatively close to the outer peripheral edge of casing relatively, the pole ear of connecting on the winding body is the edge that is close to the winding body usually, the pole ear of this application can make shorter, can save material, and the position that pole ear and casing inside are connected is also close to the edge, and is close to concave notch 10 inboard.
The invention relates to a manufacturing method of a button cell, wherein an internal connecting structure of the button cell comprises an upper shell and a lower shell which are covered, 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 liquid metal layer or a low-temperature alloy layer; the pole ear and the liquid metal layer or the low-temperature alloy layer are flatly adhered to the inner surface, and the manufacturing steps are as follows: 1) preparing an upper shell, a lower shell and a winding body, 2) flatly attaching a positive electrode tab and a negative electrode tab to the end face of the winding body, and attaching at least one of the positive electrode tab and the negative electrode tab on the winding body to a liquid metal layer or a low-temperature alloy layer, 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 liquid metal layer or the low-temperature alloy layer.
Furthermore, when only the first tab on the upper and lower end surfaces of the winding body is electrically connected by the inner surfaces of the liquid metal layer or the low-temperature alloy layer, firstly, the winding body is put into a second shell, then a second tab is welded and fixed with the inner surface of the second shell, then liquid is injected into the second shell, then the first pole ear and the liquid metal layer or the low temperature alloy layer are flatly close to the end face of the winding body (the liquid metal layer or the low temperature alloy layer is positioned between the pole ear and the inner surface of the shell, or the liquid metal layer and the low temperature alloy layer are arranged on the insulating base material layer and are attached to the back faces of the pole ear and the inner surface of the shell), after the two shells are covered, namely, the liquid metal layer or the low-temperature alloy layer can reach the melting point on the outer surface of the first shell through heat conduction and then is cooled, even if the tab is connected and fixed with the inner surface of the first shell through the liquid metal layer or the low-temperature alloy layer, the electrical connection between the tab and the shell is realized; when the first and second lugs on the upper and lower end faces of the winding body are both made of liquid metal layers or low-temperature alloy layers and the inner faces are electrically connected, the first and second lugs and the liquid metal layers or the low-temperature alloy layers are flatly close to the end faces of the winding body (the liquid metal layers or the low-temperature alloy layers are positioned between the lugs and the inner face of the shell, or the liquid metal layers and the low-temperature alloy layers are arranged on the insulating substrate layer and are attached to the back faces of the lugs and the inner face of the shell), then the winding body is placed into the first shell and then injected into the first shell, then the two shells are covered, namely the liquid metal layers or the low-temperature alloy layers can reach the melting point on the outer surfaces of the first and second shells through heat conduction, and then the two lugs are cooled again, even if the first and second lugs are fixedly connected with the inner.
Compared with the prior art, the invention has the following beneficial effects: the invention is beneficial to facilitating the connection of the tab of the button cell and the cell shell by utilizing the structure, improving the assembly efficiency and saving the manufacturing cost by reducing welding equipment; and defective products caused by missing welding and incomplete welding can be avoided.
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 (10)
1. The utility model provides an internal connection structure of button cell which 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 liquid metal layer or a low-temperature alloy layer; the pole ear and the liquid metal layer or the low-temperature alloy layer are flatly attached to the inner surface.
2. The internal connection structure of button cell battery according to claim 1, characterized in that: before assembling the upper shell, the lower shell and the winding body, the positive pole lug and the negative pole lug are flatly attached to the end face of the winding body, at least one of the positive pole lug and the negative pole lug on the winding body is attached to the liquid metal layer or the low-temperature alloy layer, then the winding body is placed into the upper shell or the lower shell and then injected with liquid, the upper shell and the lower shell are pressed tightly, and then the positive pole lug or the negative pole lug is electrically connected with the inner face of the upper shell or the lower shell through the liquid metal layer or the low-temperature alloy layer.
3. The internal connection structure of button cell battery according to claim 1, characterized in that: and after the internal temperature of the battery is higher than 90 ℃, the viscosity of the liquid metal layer or the low-temperature alloy layer is gradually reduced or loses the viscosity, and the positive pole lug or the negative pole lug is disconnected from 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.
4. The internal connection structure of button cell battery according to claim 1, characterized in that: the back of the liquid metal layer or the low-temperature alloy layer is provided with an insulating base material layer, the length and/or the width of the liquid metal layer or the low-temperature alloy layer are/is larger than that of the pole lug, and the liquid metal layer or the low-temperature alloy layer is adhered to the pole lug and the extended part is adhered to the inner face, opposite to the upper end face and the lower end face of the winding body, of the upper shell or the lower shell.
5. The internal connection structure of button cell battery according to claim 1, characterized in that: and the liquid metal layer or the low-temperature alloy layer is respectively adhered to the lug and the inner surface of the shell.
6. The internal connection structure of button cell battery according to claim 5, characterized in that: and insulation plates are attached to the upper surface and the lower surface of the winding body.
7. The internal connection structure of button cell battery according to claim 1, characterized in that: the outer peripheral wall of the upper shell is sleeved with an insulating sleeve, the lower part of the insulating sleeve is bent and coated on the lower part of the inner peripheral wall of the upper shell, and the inner peripheral wall of the lower shell is press-fitted on the outer periphery of the insulating sleeve; the positive pole lug and the negative pole lug are electrically connected with the inner surface of the upper shell or the lower shell through the liquid metal layer or the low-temperature alloy layer.
8. The internal connection structure of button cell battery according to claim 1, characterized in that: 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.
9. A manufacturing method of an internal connection structure of a button cell is characterized in that: the internal connection structure of the button cell comprises an upper shell and a lower shell which are covered, 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 liquid metal layer or a low-temperature alloy layer; the pole ear and the liquid metal layer or the low-temperature alloy layer are flatly adhered to the inner surface, and the manufacturing steps are as follows: 1) preparing an upper shell, a lower shell and a winding body, 2) flatly attaching a positive electrode tab and a negative electrode tab to the end face of the winding body, and attaching at least one of the positive electrode tab and the negative electrode tab on the winding body to a liquid metal layer or a low-temperature alloy layer, 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 liquid metal layer or the low-temperature alloy layer.
10. The internal connection structure of button cell battery according to claim 9, characterized in that: when only the first tab on the upper and lower end surfaces of the winding body is electrically connected by using the inner surfaces of the liquid metal layer or the low-temperature alloy layer, firstly, the winding body is put into a second shell, then a second tab is welded and fixed with the inner surface of the second shell, then liquid is injected into the second shell, then the first pole ear and the liquid metal layer or the low temperature alloy layer are flatly close to the end face of the winding body (the liquid metal layer or the low temperature alloy layer is positioned between the pole ear and the inner surface of the shell, or the liquid metal layer and the low temperature alloy layer are arranged on the insulating base material layer and are attached to the back faces of the pole ear and the inner surface of the shell), after the two shells are covered, namely, the liquid metal layer or the low-temperature alloy layer can reach the melting point on the outer surface of the first shell through heat conduction and then is cooled, even if the tab is connected and fixed with the inner surface of the first shell through the liquid metal layer or the low-temperature alloy layer, the electrical connection between the tab and the shell is realized; when the first and second lugs on the upper and lower end faces of the winding body are both made of liquid metal layers or low-temperature alloy layers and the inner faces are electrically connected, the first and second lugs and the liquid metal layers or the low-temperature alloy layers are flatly close to the end faces of the winding body (the liquid metal layers or the low-temperature alloy layers are positioned between the lugs and the inner face of the shell, or the liquid metal layers and the low-temperature alloy layers are arranged on the insulating substrate layer and are attached to the back faces of the lugs and the inner face of the shell), then the winding body is placed into the first shell and then injected into the first shell, then the two shells are covered, namely the liquid metal layers or the low-temperature alloy layers can reach the melting point on the outer surfaces of the first and second shells through heat conduction, and then the two lugs are cooled again, even if the first and second lugs are fixedly connected with the inner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911394407.6A CN111048730A (en) | 2019-12-30 | 2019-12-30 | Internal connection structure of button cell and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911394407.6A CN111048730A (en) | 2019-12-30 | 2019-12-30 | Internal connection structure of button cell and manufacturing method thereof |
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| CN111048730A true CN111048730A (en) | 2020-04-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111354912A (en) * | 2020-04-24 | 2020-06-30 | 福建南平延平区南孚新能源科技有限公司 | Electric connection method, electric connection structure and product of button cell pole shell and electrode lug |
| CN112952180A (en) * | 2021-01-13 | 2021-06-11 | 中银（宁波）电池有限公司 | Winding button cell with diaphragm as electrode substrate and manufacturing method |
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| CN103262288A (en) * | 2010-08-03 | 2013-08-21 | 瓦尔达微电池有限责任公司 | Button cell comprising a coil electrode with a thermal link |
| CN104919617A (en) * | 2012-11-09 | 2015-09-16 | 瓦尔达微电池有限责任公司 | Button cell with electrode coil |
| CN109786611A (en) * | 2019-02-02 | 2019-05-21 | 广东微电新能源有限公司 | Cell apparatus and electronic equipment |
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| CN103262288A (en) * | 2010-08-03 | 2013-08-21 | 瓦尔达微电池有限责任公司 | Button cell comprising a coil electrode with a thermal link |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111354912A (en) * | 2020-04-24 | 2020-06-30 | 福建南平延平区南孚新能源科技有限公司 | Electric connection method, electric connection structure and product of button cell pole shell and electrode lug |
| CN112952180A (en) * | 2021-01-13 | 2021-06-11 | 中银（宁波）电池有限公司 | Winding button cell with diaphragm as electrode substrate and manufacturing method |
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Application publication date: 20200421 |