CN111354916A - Electric connection method, electric connection structure and product of button cell pole shell and electrode lug - Google Patents
Electric connection method, electric connection structure and product of button cell pole shell and electrode lug Download PDFInfo
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- CN111354916A CN111354916A CN202010335480.2A CN202010335480A CN111354916A CN 111354916 A CN111354916 A CN 111354916A CN 202010335480 A CN202010335480 A CN 202010335480A CN 111354916 A CN111354916 A CN 111354916A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 111
- 238000003466 welding Methods 0.000 claims abstract description 59
- 239000000853 adhesive Substances 0.000 claims abstract description 18
- 230000001070 adhesive effect Effects 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 31
- 238000009413 insulation Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 9
- 239000012790 adhesive layer Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 7
- 239000004020 conductor Substances 0.000 description 16
- 238000003825 pressing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/216—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for button or coin 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
- 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
-
- 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
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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
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides an electric connection method, an electric connection structure and a product of a button battery pole shell and an electrode lug, wherein the electric connection method of the pole shell and the electrode lug comprises the following steps: firstly, preparing a metal sheet, welding one end of an electrode lug extending out of a battery core on the metal sheet, and forming a welding spot between the electrode lug and the metal sheet; and then coating a layer of conductive adhesive on the non-welding surface of the metal sheet, and bonding and fixing the surface of the metal sheet coated with the conductive adhesive with the inner surface of the pole shell, wherein the outer contour line of the metal sheet is positioned outside the outer contour line of the axial cavity covering area of the electric core, and the welding spot is positioned on the metal sheet outside the axial cavity covering area of the electric core. The invention also prepares the electric connection structure according to the method, and applies the structure to the button battery, which can keep the surface of the battery pole shell smooth and intact, and is not easy to have electrolyte leakage and surface bulge, and the metal sheet and the pole shell keep good electric contact.
Description
Technical Field
The invention relates to an electric connection method, a connection structure and a product of a button cell pole shell and an electrode lug.
Background
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.
Button cells include both laminate and wound. The basic structure of the winding type button cell is as follows: the button battery comprises a first pole shell, a second pole shell, an insulating seal ring and a battery cell, wherein the upper openings and the lower openings of the first pole shell and the second pole shell are oppositely buckled to form a cylindrical button battery shell; a gap is reserved between the first pole shell and the second pole shell, the gap is filled with an insulating sealing ring to electrically isolate the first pole shell from the second pole shell, and an accommodating cavity is formed among the first pole shell, the second pole shell and the insulating sealing ring; the electric core is located the holding intracavity, electric core include first pole piece, second pole piece and diaphragm, through the diaphragm interval between first pole piece and the second pole piece, first pole piece, second pole piece and diaphragm are convoluteed and are made electric core, and the center of electric core is formed with the axial cavity, is equipped with first output conductor on the first pole piece, and first output conductor stretches out and welds with first polar shell from electric core, is equipped with second output conductor on the second pole piece, and second output conductor stretches out and welds with second polar shell from electric core. When the conventional coiled button battery is manufactured, a first output conductor of a battery core is bent to enable the first output conductor to be tightly attached to the lower surface of the battery core, and the first output conductor extends to the position right below an axial cavity; then vertically arranging the battery cell into the first pole shell; then, the welding needle is vertically inserted downwards into the axial cavity, the first output conductor is tightly pressed on the first shell, and the first output conductor and the first polar shell are welded together in an electric resistance welding mode, or the first polar shell and the first output conductor are welded together in a laser welding mode by emitting laser from the lower part of the first polar shell opposite to the area of the first polar shell, which is vertically overlapped with the first output conductor; welding a second output conductor of the battery cell on a second pole shell, wherein an insulating sealing ring is sleeved outside the second pole shell; and finally, covering the opening at the upper end of the first polar shell together with the second polar shell and the insulating sealing ring, and sealing. One of the first pole shell and the second pole shell, the corresponding output conductor and the corresponding battery cell pole piece form a positive pole loop of the battery, and the other pole shell, the corresponding output conductor and the corresponding battery cell pole piece form a negative pole loop of the battery. Because first output conductor and first polar shell welding (second output conductor and second polar shell welding) time, the electric current that resistance welded and the laser beam of laser welding all can the straight line pierce through first polar shell (second polar shell) for the solder joint can run through first polar shell (second polar shell) setting, destroys roughness and the stability on polar shell surface, when interior pressure is too big, the solder joint breaks easily, thereby the phenomenon such as weeping and the surperficial swell that lead to the solder joint position electrolyte to appear easily.
Disclosure of Invention
The invention aims to provide an electric connection method for a button cell pole shell and an electrode lug, which can avoid the damage to the flatness and stability of the surface of the pole shell and is not easy to cause electrolyte leakage, surface bulge and the like.
The button cell pole shell and electrode lug electric connection method, the pole shell is cup-shaped, installs electric core in the pole shell, electric core mainly by positive plate, negative pole piece, diaphragm coiling form, the center of electric core forms an axial cavity, positive and negative pole piece are equallyd divide and are connected with an electrode lug electricity respectively, arbitrary electrode lug is connected with corresponding pole shell electricity again, the pole shell and electrode lug electric connection method includes the following steps:
s1: preparing a metal sheet, welding one end of an electrode lug extending out of the battery core on the metal sheet, and forming a welding spot between the electrode lug and the metal sheet;
s2: and coating conductive adhesive on the non-welding surface of the metal sheet, and adhering and fixing the surface of the metal sheet coated with the conductive adhesive and the inner surface of the pole shell together, wherein the outer contour line of the metal sheet is positioned outside the outer contour line of the covering area of the axial cavity of the battery cell, and the welding point formed in the step S1 is positioned on the metal sheet outside the covering area of the axial cavity of the battery cell.
Because the welded connection strength is high and is not influenced by external factors (such as temperature, humidity, corrosivity and other climatic environments), the stable connection between the electrode lug and the metal sheet is realized by welding one end of the electrode lug extending out of the battery core on the metal sheet before the metal sheet is arranged in the electrode shell, meanwhile, the conductive adhesive connection has the advantages of simple operation, no damage to a base material, high fatigue resistance of a joint and the like, and if the metal sheet is only in surface contact physical connection with the electrode shell, because a welding point between the electrode lug and the metal sheet usually penetrates through the metal sheet in a straight line, a 'bump' is formed on a non-welding surface of the metal sheet, the lower surface of the metal sheet is not smooth enough, and the electrical contact stability between the metal sheet and the electrode shell is poor; according to the invention, the conductive adhesive is coated on the non-welding surface of the metal sheet, so that not only can stable connection between the metal sheet and the polar shell be realized, but also the defect that the lower surface of the metal sheet is uneven is compensated through the flexibility of the conductive adhesive, the conductive adhesive is tightly attached to the polar shell, so that good electric contact between the metal sheet and the polar shell is ensured, meanwhile, the structure of the polar shell is kept complete, electrolyte leakage and surface bulge and other phenomena are not easy to occur, in addition, any contact between the welding point position of the tab and the electric core pole piece longitudinally expanded to the axial cavity of the electric core can be avoided, and the short circuit phenomenon is avoided.
In a specific implementation process, the steps S1 and S2 may be performed in an interchangeable order, and at least 1 pair of welding points is formed between the electrode tab and the metal sheet through resistance welding of parallel welding in step S1.
Preferably, in step S2, the non-soldering surface of the metal sheet is coated with the conductive adhesive uniformly and in all directions, so as to ensure that the metal sheet and the electrode shell have the largest contact area and improve the good electrical contact therebetween.
In the specific implementation process, in step S1, any one of laser welding and resistance welding is used to weld the metal sheets and the electrode tabs.
The invention also aims to provide an electrode shell and electrode lug electric connection structure of a button battery, which comprises the electrode shell and the electrode lug, wherein the electrode shell is in a cup shape, a battery cell is arranged in the electrode shell, the battery cell is mainly formed by winding a positive plate, a negative plate and a diaphragm, an axial cavity is formed in the center of the battery cell, the positive plate and the negative plate are respectively and electrically connected with the electrode lug, one end of any electrode lug extending out of the battery cell is fixedly connected with the outer surface of a metal sheet through a welding point, the metal sheet is fixedly arranged on the inner surface of the electrode shell corresponding to any electrode lug through a conductive adhesive layer, the outer contour line of the metal sheet is positioned outside the outer contour line of an axial cavity covering area of the battery cell, and the welding point is positioned on the metal sheet outside the.
Preferably, an insulating sheet is arranged between the metal sheet and the battery core, and the electrode lug penetrates or bypasses the insulating sheet and is fixed with the outer surface of the metal sheet in a welding mode. The arrangement of the insulating sheet can avoid the electrode lug from contacting with one of the positive plate and the negative plate which is not electrically connected with the electrode lug to form a short circuit.
Preferably, the metal sheet covers the battery core, and the outer edge of the metal sheet vertically extends towards the outside of the battery core to form an annular flange.
The invention also aims to provide a manufacturing method of the button battery, the button battery comprises a positive electrode shell, a negative electrode shell and a battery cell, the positive electrode shell and the negative electrode shell are both in a cup shape, the battery cell is firstly arranged in any one of the positive electrode shell and the negative electrode shell, then the upper opening and the lower opening of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell, the battery cell is wrapped in the button battery shell, the electric core is mainly formed by winding a positive plate, a negative plate and a diaphragm, an axial cavity is formed in the center of the electric core, a positive pole lug is arranged on the positive plate and is electrically connected with a positive shell, a negative pole lug is arranged on the negative plate and is electrically connected with a negative shell, and the button battery pole shell and the electrode lug are electrically connected in any one of an electric connection mode between the positive pole lug and the positive shell and an electric connection mode between the negative pole lug and the negative shell.
Preferably, after the upper openings and the lower openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form the cylindrical button battery shell, the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, and the cylindrical button battery shell is sealed by inwardly extruding the end wall of the opening of the positive electrode shell exposed outside. The extrusion sealing step has the technical effect that the metal sheet and the corresponding pole shell are attached more tightly to a certain extent.
The invention also provides a button battery, which is manufactured according to the manufacturing method of the button battery and comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery core, wherein the positive electrode shell and the negative electrode shell are both cup-shaped, and the upper openings and the lower openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and is mainly formed by winding a positive plate, a negative plate and a diaphragm, an axial cavity is formed in the center of the battery cell, the positive plate is electrically connected with a positive pole lug, the positive pole lug is further electrically connected with the positive shell, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is further electrically connected with the negative shell; at least one of the connection structure between the positive electrode shell and the positive electrode lug and the connection structure between the negative electrode shell and the negative electrode lug adopts the electrical connection structure between the button battery electrode shell and the electrode lug.
The positive and negative electrode shell structures of the button battery manufactured by the button battery manufacturing method are kept complete, electrolyte leakage, surface bulging and the like are not prone to occurring, connection between the positive and negative electrode lugs and the corresponding metal sheets is stable, the positive and negative electrode lugs are not prone to moving, meanwhile, any contact between the welding spot positions of the electrode lugs and the battery cell pole pieces longitudinally expanded and expanded into the axial cavity of the battery cell can be avoided, and the short circuit phenomenon is avoided.
Preferably, the connection structure between the positive electrode shell and the positive electrode tab adopts the structure for electrically connecting the positive electrode shell and the electrode tab of the button battery, and a positive electrode metal sheet and a positive electrode conductive adhesive layer are arranged between the positive electrode shell and the positive electrode tab, further, the positive electrode metal sheet covers the battery core, the outer edge of the positive electrode metal sheet vertically extends towards the outer side of the battery core to form an annular flange which can play a role of fixing the battery core, further, the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, the opening end wall of the negative electrode shell is positioned at the inner side of the opening end wall of the positive electrode shell, a gap is reserved between the opening end wall of the negative electrode shell and the opening end wall of the positive electrode shell, the insulating sealing ring is clamped in the gap, the lower end of the insulating sealing ring extends inwards to form a bent part which wraps the opening end wall of the negative electrode shell, the positive electrode shell, the battery core and the insulating sealing ring are formed into an annular cavity, the annular flange of the positive electrode metal sheet is embedded in the annular flange and is abutted to the bottom of the bent part of the insulating sealing ring, the annular flange, and the annular flange can play a role of pressing force for pressing the annular flange in the positive electrode shell, and the annular flange can be more preferably, and the annular flange can be pressed into the annular flange in the process of the annular cavity, so that the annular flange, and the annular flange, and "
And (4) shape.
Preferably, an anode insulating sheet is arranged between the anode shell and the battery core, and an anode tab penetrates or bypasses the anode insulating sheet and is electrically connected with the inner surface of the anode shell. The arrangement of the anode insulation sheet can avoid the contact of the anode tab and the cathode sheet of the battery cell to form a short circuit.
Preferably, a negative electrode insulation sheet is arranged between the negative electrode shell and the battery core, and a negative electrode tab penetrates or bypasses the negative electrode insulation sheet and is electrically connected with the inner surface of the negative electrode shell. The arrangement of the negative electrode insulation sheet can avoid the contact of a negative electrode tab and a positive electrode sheet of the battery cell to form a short circuit.
Drawings
Fig. 1 is a structural view of a weld between an electrode tab and a metal sheet of example 1, wherein the metal sheet is a cross-sectional view;
FIG. 2 is a diagram showing the connection structure between the metal sheet and the pole case of example 1;
FIG. 3 is a top view structural view of a pole case of embodiment 1;
FIG. 4 is a schematic sectional view of a button cell of example 1;
FIG. 5 is a schematic sectional view of a button cell of example 2;
FIG. 6 is a schematic sectional view of a button cell of embodiment 3; in fig. 2 to 6, the metal sheet, the pole case, and the insulating sheet are all cross-sectional views.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings:
example 1
With reference to fig. 1 to 4, a button battery pole shell and an electrode tab electrical connection method, where the pole shell 10 is cup-shaped, a battery cell 30 is installed in the pole shell 10, the battery cell 30 is mainly formed by winding a positive plate 31, a negative plate 32, and a diaphragm 33, an axial cavity 34 is formed at the center of the battery cell 30, the positive and negative plates (31, 32) are respectively electrically connected with an electrode tab 20, any electrode tab 20 is electrically connected with a corresponding pole shell 10, and the electrode shell 10 and the electrode tab 20 electrical connection method includes the following steps:
s1: preparing a metal sheet 40, welding one end of the electrode tab 20 extending out of the battery core 30 on the metal sheet 40, and forming a welding spot 50 between the electrode tab 20 and the metal sheet 40;
s2: and coating a conductive adhesive 80 on the non-welding surface of the metal sheet 40, and adhering and fixing the surface, coated with the conductive adhesive 80, of the metal sheet 40 to the inner surface of the pole shell 10, wherein the outer contour line 40 'of the metal sheet 40 is located outside the outer contour line 34' of the coverage area of the cell axial cavity 34, and the welding point 50 formed in the step S1 is located on the metal sheet 40 outside the coverage area 34 of the cell axial cavity.
According to the invention, the non-welding surface of the metal sheet 40 is coated with the conductive adhesive 80, so that the stable connection between the metal sheet 40 and the electrode shell 10 can be realized, meanwhile, the defect that the non-welding surface of the metal sheet 40 is uneven is made up through the flexibility of the conductive adhesive 80, the conductive adhesive 80 is tightly attached to the electrode shell 10, the good electrical contact between the metal sheet 40 and the electrode shell 10 is ensured, meanwhile, the structure of the electrode shell 10 is kept complete, electrolyte leakage and surface bulging and other phenomena are not easy to occur, in addition, the connection stability of the tab 20 and the corresponding metal sheet 40 is good, meanwhile, any contact between the welding point position of the tab 20 and a battery cell pole piece longitudinally expanded to the axial cavity 34 of the battery cell can be avoided, and the short circuit phenomenon is avoided.
With reference to fig. 1 to 4, the electrical connection structure manufactured by the method for electrically connecting the electrode shell and the electrode tab of the button cell comprises an electrode shell 10 and an electrode tab 20, the electrode shell 10 is cup-shaped, an electric core 30 is installed in the electrode shell 10, the electric core 30 is mainly formed by winding a positive plate 31, a negative plate 32 and a diaphragm 33, an axial cavity 34 is formed at the center of the electric core 30, the positive plate (31) and the negative plate (32) are respectively and electrically connected with an electrode tab 20, one end of any electrode tab 20 extending out of the electric core 30 is fixedly connected with the outer surface of a metal sheet 40 through a welding spot 50, the metal sheet 40 is fixedly disposed on the inner surface of the electrode shell 10 corresponding to any electrode tab 20 through a conductive adhesive layer 80, the outer contour line 40 'of the metal sheet 40 is located outside the outer contour line 34' of the covering region of the axial cavity 34 of the battery cell, and the welding point 50 is located on the metal sheet 40 outside the covering region 34 of the axial cavity of the battery cell.
With reference to fig. 1 to 4, embodiment 1 further provides a button battery, which is manufactured according to the method for manufacturing a button battery of embodiment 1, and includes a positive electrode case 11, a negative electrode case 12, an insulating seal ring 70, and an electric core 3, where the positive electrode case 11 and the negative electrode case 12 are both cup-shaped, and upper and lower openings of the positive electrode case 11 and the negative electrode case 12 are oppositely buckled to form a cylindrical button battery case; a gap is reserved between the positive electrode shell 11 and the negative electrode shell 12, the insulating sealing ring 70 is filled in the gap to electrically isolate the positive electrode shell 11 from the negative electrode shell 12, and an accommodating cavity is formed among the positive electrode shell 11, the negative electrode shell 12 and the insulating sealing ring 70; the battery cell 30 is arranged in the accommodating cavity, the battery cell 30 is mainly formed by winding a positive plate 31, a negative plate 32 and a diaphragm 33, an axial cavity 34 is formed in the center of the battery cell 30, the positive plate 31 is electrically connected with a positive pole tab 21, the positive pole tab 21 is electrically connected with the positive shell 11, the negative plate 32 is electrically connected with a negative pole tab 22, and the negative pole tab 22 is electrically connected with the negative shell 12; the connection structure between positive electrode shell 11 and positive electrode tab 21 and the connection structure between negative electrode shell 12 and negative electrode tab 22 all adopt the aforesaid button cell pole shell and electrode tab electric connection structure, specifically are: a positive pole metal sheet 41 is fixedly arranged on the inner surface of the positive pole shell 11 through a positive pole conductive adhesive layer 81, a positive pole tab 21 is fixedly connected with the outer surface of the positive pole metal sheet 41 through a positive pole welding spot 51, the outer contour line of the positive pole metal sheet 41 is positioned outside the outer contour line of the covering area of the axial cavity 34 of the battery core, and the positive pole welding spot 51 is positioned on the positive pole metal sheet 41 outside the covering area 34 of the axial cavity of the battery core; a negative pole metal sheet 42 is fixedly arranged on the inner surface of the negative pole shell 12 through a negative pole conductive adhesive layer 82, a negative pole tab 22 is fixedly connected with the outer surface of the negative pole metal sheet 42 through a negative pole welding point 52, the outer contour line of the negative pole metal sheet 42 is positioned outside the outer contour line of the covering area of the axial cavity 34 of the battery core, and the negative pole welding point 52 is positioned on the negative pole metal sheet 42 outside the covering area 34 of the axial cavity of the battery core;
the positive electrode metal sheet 41 and the negative electrode metal sheet 42 are both planar metal plate structures.
The positive and negative electrode shells (11, 12) of the invention keep complete structure, electrolyte leakage and surface bulge are not easy to occur, the connection stability between the positive and negative electrode tabs (21, 22) and the corresponding metal sheets (41, 42) is good, the positive and negative electrode tabs (21, 22) are not easy to move, and short circuit can be avoided.
Example 2
A method for manufacturing a button cell, which is different from the method for manufacturing the button cell of embodiment 1, is as follows: the only physical connection between the negative electrode metal sheet 42 and the negative electrode can 12 is direct bonding.
As shown in fig. 5, a button cell is manufactured according to the manufacturing method of the button cell of example 2, which is different from the button cell of example 1 in that a negative electrode metal sheet 42 is physically connected with a negative electrode casing 12 in a surface contact manner, a positive electrode metal sheet 41 is disposed to cover the battery cell 30, an outer edge of the positive electrode metal sheet 41 vertically extends towards the outer side of the battery cell 30 to form an annular rib 410, and the section of the annular rib 410 is in an "┐" shape.
Example 3
As shown in fig. 6, a button cell, which is manufactured according to the method for manufacturing the button cell of example 2, is different from the button cell of example 2 in that: the annular rib 410 has a cross-section of "
And (4) shape.
Of course, the negative electrode metal sheet 42 is disposed to cover the battery cell 30, and the outer edge of the negative electrode metal sheet 42 may also extend perpendicularly to the outer side of the battery cell 30 to form an annular rib, and in addition, the cross-sectional shape of the annular rib 410 of the present invention is not limited to the "┐" shape or "shape"
The shape of the Chinese character 'ji' can also be other common shapes such as T-shaped or special-shaped shapes.
The method for electrically connecting the button cell and the electrode tab in the embodiment 1 can be improved as follows: in step S2, the non-welding surface of the metal sheet 40 is coated with the conductive adhesive uniformly and in all directions, so as to ensure that the contact area between the metal sheet 40 and the electrode shell 10 is as large as possible, and improve the electrical contact effect. In the specific implementation process, in step S1, any one of laser welding and resistance welding is used to weld the metal sheets 40 and the electrode tabs 20.
The button cell and electrode tab electric connection structure of embodiment 1 can be improved as follows: as shown in fig. 5 and 6, an insulating sheet 90 is disposed between the metal sheet 40 and the battery cell 30, and the electrode tab 20 passes through or around the insulating sheet 90 and is welded and fixed to the outer surface of the metal sheet 40. The insulating sheet 90 is provided to prevent the electrode tab 20 from contacting a short circuit with one of the positive electrode sheet 31 and the negative electrode sheet 32 that is not electrically connected to the electrode tab 20. Certainly, the insulating sheet 90 may not be disposed between the metal sheet 40 and the battery cell 30 in the invention, and at this time, a short circuit may be avoided by wrapping a layer of insulating sleeve outside the electrode tab 20, or a pole piece not electrically connected to the electrode tab 20 and the electrode tab 20 extending out of the battery cell 30 are kept at a certain height distance by disposing the positive pole piece 31 and the negative pole piece 32 in the battery cell 30 in a vertically staggered manner, so as to avoid a short circuit.
The button cell manufacturing method of example 1 can be modified as follows: after the positive electrode shell 11 and the negative electrode shell 12 are oppositely buckled with each other at the upper and lower openings to form a cylindrical button cell shell, the positive electrode shell and the negative electrode shell (11, 12) are partially overlapped in the vertical direction, and the cylindrical button cell shell is sealed by inwardly pressing the end wall of the opening of the electrode shell exposed outside. The extrusion sealing step has the technical effect that the metal sheet and the corresponding pole shell are attached more tightly to a certain extent.
The button cells of embodiments 1-3 can be further improved as follows:
(1) as shown in fig. 4 to 6, a positive electrode insulation sheet 91 is disposed between the positive electrode casing 11 and the battery cell 30, and the positive electrode tab 21 passes through or bypasses the positive electrode insulation sheet 91 and is electrically connected to the inner surface of the positive electrode casing 11. The arrangement of the positive insulation sheet 91 can avoid the short circuit formed by the contact between the positive tab 21 and the negative tab 32 of the battery cell 30;
(2) as shown in fig. 4 to 6, a negative electrode insulation sheet 92 is respectively disposed between the negative electrode casing 12 and the battery cell 30, and the negative electrode tab 22 passes through or bypasses the negative electrode insulation sheet 92 and is electrically connected to the inner surface of the negative electrode casing 12. The negative insulation sheet 92 is provided to prevent the negative tab 22 from contacting the positive sheet 31 of the battery cell 30 to form a short circuit.
The button cell of example 2 and example 3 can be further modified as follows: as shown in fig. 5 and 6, when the connection structure between the positive electrode shell 11 and the positive electrode tab 21 adopts the above-mentioned button battery electrode shell and electrode tab electrical connection structure, the positive electrode shell and the negative electrode shell (11, 12) are partially overlapped in the vertical direction, the opening end wall of the negative electrode shell 12 is located inside the opening end wall of the positive electrode shell 11, a gap is left between the opening end wall of the negative electrode shell 12 and the opening end wall of the positive electrode shell 11, the insulating sealing ring 70 is clamped in the gap, the lower end of the insulating sealing ring 70 extends inward to form a bending portion 71, the bending portion 71 wraps the opening end wall of the negative electrode shell 12 in the gap, and an annular cavity is formed among the positive electrode shell 11, the battery cell 30 and the insulating sealing ring bending portion 71; the annular rib 410 of the positive electrode metal sheet 41 is embedded in the annular cavity, and the upper end of the annular rib 410 is abutted to the bottom of the bending part 71 of the insulating sealing ring. The contact area between the positive electrode metal sheet 41 and the positive electrode can 11 is large, which can achieve the function of collecting current, and meanwhile, when the conventional battery sealing operation is performed by pressing the opening end wall of the positive electrode can 11 inwards, the opening end wall of the positive electrode can 11 transmits downward pressing force to the annular rib 410 in the inward bending process, so that the physical contact between the positive electrode metal sheet 41 and the positive electrode can 11 is tighter.
The method for electrically connecting the electrode shell and the electrode tab of the button cell in example 1 is a preferred embodiment of the present invention, but the method for electrically connecting the electrode shell and the electrode tab of the button cell of the present invention may also be implemented by "replacing the sequence of the steps S1 and S2, and forming at least 1 pair of welding points (51; 52) between the electrode tab (21; 22) and the metal sheet (41; 42) by resistance welding in parallel welding in step S1" (the obtained welding structure is shown in fig. 4), and others.
It should be noted that the present invention is not limited to the connection method of the present invention for both the positive electrode case 11 and the positive electrode tab 21 and the negative electrode case 12 and the negative electrode tab 22 of the button cell in examples 1 to 3, and for example, when only one of the connection method of the positive electrode case 11 and the positive electrode tab 21 and the connection method of the negative electrode case 12 and the negative electrode tab 22 is the above-mentioned connection method, the other connection method may be any one of the existing connection methods that can achieve the electrical connection between the electrode tabs and the corresponding electrode cases, such as a resistance welding method that parallel welds the electrode tabs or a physical connection that only surface contacts the electrode tabs. In addition, the sealing step of the invention is not limited to sealing the cylindrical button cell shell by pressing the exposed end wall of the pole shell opening inwards, and any sealing method can be used. The structure of the battery cell 30 of the present invention is not limited to the specific structure shown in the drawings, and may be any battery cell structure.
Claims (16)
1. The button cell pole shell and electrode lug electric connection method, the pole shell is cup-shaped, installs electric core in the pole shell, electric core mainly is formed by positive plate, negative plate, diaphragm coiling, and the center of electric core forms an axial cavity, and positive and negative plate equally divide and do not be connected with an electrode lug electricity, and arbitrary electrode lug is connected with corresponding pole shell electricity again, its characterized in that, the pole shell and electrode lug electric connection method includes the following steps:
s1: preparing a metal sheet, welding one end of an electrode lug extending out of the battery core on the metal sheet, and forming a welding spot between the electrode lug and the metal sheet;
s2: and coating conductive adhesive on the non-welding surface of the metal sheet, and adhering and fixing the surface of the metal sheet coated with the conductive adhesive and the inner surface of the pole shell together, wherein the outer contour line of the metal sheet is positioned outside the outer contour line of the covering area of the axial cavity of the battery cell, and the welding point formed in the step S1 is positioned on the metal sheet outside the covering area of the axial cavity of the battery cell.
2. The button cell pole shell and electrode tab electrical connection method of claim 1, wherein: the sequence of the step S1 and the step S2 is changed, and at least 1 pair of welding points are formed between the electrode tab and the metal sheet through resistance welding of parallel welding in the step S1.
3. The button cell pole shell and electrode tab electrical connection method of claim 1, wherein: in step S2, a conductive adhesive is uniformly applied to the non-soldering surface of the metal sheet in all directions.
4. The button cell pole shell and electrode tab electrical connection method of claim 1, wherein: in step S1, any one of laser welding and resistance welding is used between the metal sheet and the electrode tab.
5. Button cell polar shell and electrode utmost point ear electricity connection structure, it includes polar shell and electrode utmost point ear, the polar shell is the cup, installs electric core in the polar shell, electric core mainly is formed by positive plate, negative pole piece, diaphragm coiling, and the center of electric core forms an axial cavity, just, the negative pole piece is equallyd divide and is do not connected with an electrode utmost point ear electricity, its characterized in that, the one end that arbitrary electrode utmost point ear stretches out electric core is passed through the weld and is connected with the surface fixity of a sheetmetal, and this sheetmetal sets up on the internal surface of the polar shell that arbitrary electrode utmost point ear corresponds through conductive adhesive layer is fixed, and the outer contour line of sheetmetal is located outside electric core axial cavity coverage area's outer contour line, the solder joint is located the sheetmetal outside electric core.
6. The button cell polar shell and electrode tab electric connection structure of claim 5, characterized in that: an insulating sheet is arranged between the metal sheet and the battery core, and the electrode lug penetrates or bypasses the insulating sheet and is fixedly welded with the outer surface of the metal sheet.
7. The button cell polar shell and electrode tab electric connection structure of claim 5, characterized in that: the metal sheet covers the battery core, and the outer edge of the metal sheet vertically extends towards the outside of the battery core to form an annular flange.
8. The utility model provides a button cell's preparation method, button cell includes anodal shell, negative pole shell and electric core, and anodal shell and negative pole shell all are the cup, pack into the electric core earlier in arbitrary utmost point shell in anodal shell and the negative pole shell, and the relative buckleing of opening forms cylindrical button cell shell in with anodal shell and negative pole shell again and wraps up electric core in it, electric core mainly is formed by positive plate, negative pole piece, diaphragm coiling, and the center of electric core forms an axial cavity, is equipped with anodal utmost point ear on the positive plate, and anodal utmost point ear is connected with anodal shell electricity again, is equipped with negative pole utmost point ear on the negative pole piece, and negative pole utmost point ear is connected its characterized in that with negative: the method for electrically connecting the button cell pole shell and the electrode lug is adopted in any one of the electrical connection modes of the anode lug and the anode shell and the electrical connection mode of the cathode lug and the cathode shell, and the method for electrically connecting the button cell pole shell and the electrode lug is adopted in any one of claims 1 to 4.
9. The method for manufacturing the button cell as claimed in claim 8, wherein: after the openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form the cylindrical button battery shell, the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, and the cylindrical button battery shell is sealed by the end wall of the opening of the pole shell exposed outside through inward extrusion.
10. A button battery comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery cell, wherein the positive electrode shell and the negative electrode shell are both cup-shaped, and the upper openings and the lower openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and is mainly formed by winding a positive plate, a negative plate and a diaphragm, an axial cavity is formed in the center of the battery cell, the positive plate is electrically connected with a positive pole lug, the positive pole lug is further electrically connected with the positive shell, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is further electrically connected with the negative shell; the method is characterized in that: at least one of the connection structure between the positive electrode shell and the positive electrode tab and the connection structure between the negative electrode shell and the negative electrode tab adopts the button cell pole shell and electrode tab electric connection structure of claim 5.
11. A button cell according to claim 10, wherein: the connecting structure between the positive electrode shell and the positive electrode lug adopts the button battery electrode shell and electrode lug electric connecting structure of claim 5, and a positive electrode metal sheet and a positive electrode conductive adhesive layer are arranged between the positive electrode shell and the positive electrode lug.
12. A button cell according to claim 11, wherein: the positive pole sheetmetal covers the electric core and is arranged, and the outer edge of the positive pole sheetmetal extends perpendicularly towards the outer side of the electric core to form an annular flange.
13. A button cell according to claim 12, wherein: the positive and negative electrode shells are partially overlapped in the vertical direction, the opening end wall of the negative electrode shell is positioned on the inner side of the opening end wall of the positive electrode shell, a gap is reserved between the opening end wall of the negative electrode shell and the opening end wall of the positive electrode shell, the insulating sealing ring is clamped in the gap, the lower end of the insulating sealing ring extends inwards to form a bent part, the opening end wall of the negative electrode shell is wrapped in the bent part, and an annular cavity is formed among the positive electrode shell, the battery cell and the bent part of the insulating sealing ring; the annular flange of the metal sheet of the anode is embedded in the annular cavity, and the upper end of the annular flange is abutted against the bottom of the bending part of the insulating sealing ring.
14. The button cell as claimed in claim 12, wherein the cross-section of the annular rib is ┐'
And (4) shape.
15. A button cell according to claim 10, wherein: and an anode insulating sheet is arranged between the anode shell and the battery core, and an anode tab penetrates or bypasses the anode insulating sheet and is electrically connected with the inner surface of the anode shell.
16. A button cell according to claim 10, wherein: and a negative electrode insulation sheet is arranged between the negative electrode shell and the battery core, and a negative electrode tab penetrates or bypasses the negative electrode insulation sheet and is electrically connected with the inner surface of the negative electrode shell.
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| CN111354916B (en) | 2024-07-05 |
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