CN111354912B - 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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- CN111354912B CN111354912B CN202010334087.1A CN202010334087A CN111354912B CN 111354912 B CN111354912 B CN 111354912B CN 202010334087 A CN202010334087 A CN 202010334087A CN 111354912 B CN111354912 B CN 111354912B
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- 239000002184 metal Substances 0.000 claims abstract description 104
- 238000003466 welding Methods 0.000 claims abstract description 67
- 230000001070 adhesive Effects 0.000 claims abstract description 25
- 239000000853 adhesive Substances 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 32
- 230000000875 corresponding Effects 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000009413 insulation Methods 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 238000010030 laminating Methods 0.000 claims description 6
- 230000005611 electricity Effects 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
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 229910000679 solder Inorganic materials 0.000 description 3
- 206010011469 Crying Diseases 0.000 description 1
- 238000010586 diagram Methods 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
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- 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 of a single cell or a single battery
- H01M50/183—Sealing members
-
- 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
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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
- 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
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 adhering and fixing the surface of the metal sheet coated with the conductive adhesive and the inner surface of the pole shell together. 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 stratiform stack or convolute and form, 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.
Because the welded connection strength is high and is not influenced by external factors (such as temperature, humidity, corrosivity and other climatic environments), the invention welds the outer end of the electrode lug on the metal sheet before the metal sheet is arranged in the pole shell, so as to realize the stable connection between the electrode lug and the metal sheet, 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 and the pole shell are only in surface contact physical connection, because a welding point between the electrode lug and the metal sheet usually passes through the metal sheet in a straight line, a 'bump' is formed on a non-welding surface of the metal sheet, so that the lower surface of the metal sheet is not smooth enough, and the electrical contact stability between the metal sheet and the pole 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 made up 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, and the phenomena of electrolyte leakage, surface bulge and the like are not easy to occur.
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 electrode lugs, 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 laminating or winding a positive plate, a negative plate and a diaphragm in a layered manner, the positive plate and the negative plate are respectively and electrically connected with one 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, and the metal sheet is fixedly arranged on the inner surface of the electrode shell corresponding to any electrode lug through a conductive adhesive layer.
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.
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, wherein 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, and the battery cell is wrapped in the button battery 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. Preferably, one of the connection mode between the positive electrode tab and the positive electrode shell and the connection mode between the negative electrode tab and the negative electrode shell adopts the button battery electrode shell and the electrode tab electric connection mode, and the connection mode of the other electrode tab and the electrode shell is as follows: the electrode lugs are directly welded and fixed on the inner surface of the corresponding pole shell, and compared with the connection mode of the positive and negative electrode lugs and the corresponding pole shell by adopting the button battery pole shell and electrode lug electric connection structure, the structure is simpler and the operation is more efficient. Furthermore, when the positive electrode shell and the negative electrode shell are not buckled, the electrode tabs are directly welded and fixed on the inner surface of the corresponding electrode shell in a resistance welding mode of parallel welding on the inner side of the electrode shell, and the outer surface of the corresponding electrode shell can be kept intact.
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 mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, wherein 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 manufacturing method of the button battery are kept complete, electrolyte leakage, surface bulging and the like are not easy to occur, the connection between the positive and negative electrode lugs and the corresponding metal sheets is stable, the positive and negative electrode lugs are not easy to move, and short circuit is avoided.
Preferably, the connection structure of one of the connection structure between the positive electrode tab and the positive electrode shell and the connection structure between the negative electrode tab and the negative electrode shell adopts the above-mentioned button cell pole shell and electrode tab electric connection structure, and the connection structure of another tab and the pole shell is: the electrode tabs are directly welded with the corresponding electrode shells. Furthermore, the electrode tabs are directly welded and connected with the corresponding electrode shells through a pair of welding points.
Preferably, the connection structure between the positive electrode shell and the positive electrode lug adopts the electrical connection structure between the positive electrode shell and the positive electrode lug of the button cell, so that a positive electrode metal sheet and a positive electrode conductive adhesive layer are arranged between the positive electrode shell and the positive electrode lug. Further preferably, the positive pole metal sheet covers the battery core, and the outer edge of the positive pole metal sheet vertically extends towards the outside of the battery core to form an annular flange, and the annular flange can play a role in fixing the battery core. Furthermore, the positive and negative electrode cases are partially overlapped in the vertical direction, the opening end wall of the negative electrode case is positioned inside the opening end wall of the positive electrode case, and the opening end wall of the negative electrode case is positioned inside the opening end wall of the positive electrode caseA gap is reserved between the opening end walls of the 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. The contact area of the metal sheet of the positive electrode and the positive electrode shell is large, the current collecting effect can be achieved, meanwhile, when the conventional battery sealing operation is carried out by inwards extruding the opening end wall of the positive electrode shell, the opening end wall of the positive electrode shell can transmit downward pressing force to the annular retaining edge in the inwards bending process, and the metal sheet of the positive electrode and the positive electrode shell are in closer physical contact. Preferably, the cross section of the annular rib is L-shaped or "
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 the welding of an electrode tab with a metal sheet in accordance with example 1, wherein the metal sheet is a cross-sectional view;
fig. 2 is a schematic view of a connection structure between a metal sheet and a pole shell in embodiment 1, wherein the metal sheet and the pole shell are in a cross-sectional view;
FIG. 3 is a schematic sectional view of a button cell in accordance with example 1;
FIG. 4 is a schematic sectional view of a button cell in accordance with example 2;
FIG. 5 is a sectional structural view of a positive electrode metal sheet of example 3;
fig. 6 is a schematic cross-sectional structure diagram of a button cell of the present invention.
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 3, 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 stacking or winding a positive plate 31, a negative plate 32, and a diaphragm 33 in a layered manner, the positive and negative plates (31, 32) are respectively electrically connected to an electrode tab 20, and any electrode tab 20 is electrically connected to a corresponding pole shell 10, and the electrical connection method between the pole shell 10 and the electrode tab 20 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 between the electrode tab 20 and the metal sheet 40;
s2: and coating the conductive adhesive 80 on the non-welding surface of the metal sheet 40, and adhering and fixing the surface of the metal sheet 40 coated with the conductive adhesive 80 and the inner surface of the pole shell 10 together.
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 polar shell 10 can be realized, meanwhile, the defect of uneven non-welding surface of the metal sheet 40 is made up through the flexibility of the conductive adhesive 80, the conductive adhesive 80 is tightly attached to the polar shell 10, the good electrical contact between the metal sheet 40 and the polar shell 10 is ensured, meanwhile, the structure of the polar shell 10 is kept complete, and the phenomena of electrolyte leakage, surface bulging and the like are not easy to occur.
The electrical connection structure manufactured by the button battery pole shell and electrode tab electrical connection method comprises a pole shell 10 and electrode tabs 20, wherein 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 laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate 31 and the negative plate 32 are respectively electrically connected with one electrode tab 20, one end of any electrode tab 20 extending out of the battery cell 30 is fixedly connected with the outer surface of a metal sheet 40 through a welding spot 50, and the metal sheet 40 is fixedly arranged on the inner surface of the pole shell 10 corresponding to any electrode tab 20.
A button battery is manufactured according to the manufacturing method of the button battery in embodiment 1, and comprises a positive electrode shell 11, a negative electrode shell 12, an insulating seal ring 70 and a battery cell 3, wherein the positive electrode shell 11 and the negative electrode shell 12 are both cup-shaped, and the upper openings and the lower openings of the positive electrode shell 11 and the negative electrode shell 12 are oppositely buckled to form a cylindrical button battery shell; 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 laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, 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 button cell pole shell and the electrode tab electric connection structure of embodiment 1 are adopted by the connection structure between the positive pole shell 11 and the positive pole tab 21 and the connection structure between the negative pole shell 12 and the negative pole tab 22, specifically: a positive electrode metal sheet 41 is fixedly arranged on the inner surface of the positive electrode shell 11, and a positive electrode tab 21 is fixedly connected with the outer surface of the positive electrode metal sheet 41 through a positive electrode welding spot 51; a negative electrode metal sheet 42 is fixedly arranged on the inner surface of the negative electrode shell 12, and the negative electrode tab 22 is fixedly connected with the outer surface of the negative electrode metal sheet 42 through a negative electrode welding point 52;
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 is 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 button battery case and electrode tab electrical connection method of embodiment 1 is adopted for the electrical connection mode between the positive electrode tab 21 and the positive electrode case 11 and the electrical connection mode between the negative electrode tab 22 and the negative electrode case 12, and meanwhile, the connection mode between the negative electrode tab 22 and the negative electrode case 12 is as follows: when the positive electrode can 11 and the negative electrode can 12 are not joined, the negative electrode tab 22 is directly welded and fixed to the inner surface of the negative electrode can 12 by resistance welding using parallel welding inside the negative electrode can 12.
As shown in fig. 4, 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 1 in that: the negative pole tab 22 and the negative pole shell 13 are directly welded and connected through a pair of welding points 300;
meanwhile, the positive electrode metal sheet 41 is disposed to cover the battery cell 30, and an outer edge of the positive electrode metal sheet 41 vertically extends toward an outer side of the battery cell 30 to form an annular flange 410, wherein a cross section of the annular flange 410 is "l" shaped.
Example 3
A method for manufacturing a button cell is the same as the method for manufacturing the button cell in the embodiment 1.
As shown in fig. 5, a button cell, which is manufactured according to the method for manufacturing the button cell of example 1, is similar to the button cell of example 1The batteries are different: the positive electrode metal sheet 41 covers the battery core 30, the outer edge of the positive electrode metal sheet 41 vertically extends towards the outer side of the battery core 30 to form an annular rib 410, and the section of the annular rib 410 is "
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 outside direction of the battery cell 30 to form an annular rib. In addition, the cross-sectional shape of the ring-shaped rib 410 of the present invention is not limited to the L-shape or "
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. 2 to 4, an insulating sheet 90 is disposed between the metal sheet 40 and the battery cell 30, and the electrode tab 20 passes through or bypasses 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 can be improved 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 the 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 exposed end wall of the opening of the electrode shell. 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 cell of the invention can be further improved as follows:
(1) as shown in fig. 4, 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, and 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, 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 shell 11 is large, so that the current collection effect can be achieved, and meanwhile, when the conventional battery sealing operation is performed by pressing the opening end wall of the positive electrode shell 11 inwards, the downward pressing force can be transmitted to the annular flange 410 in the inward bending process of the opening end wall of the positive electrode shell 11, so that the physical contact between the positive electrode metal sheet 41 and the positive electrode shell 11 is tighter;
(2) as shown in fig. 3 and 4, a positive electrode insulation sheet 91 is disposed between the positive electrode can 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 can 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;
(3) as shown in fig. 3 and 4, a negative electrode insulation sheet 92 is respectively disposed between the negative electrode casing 12 and the battery core 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 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. 6), and others.
It should be noted that the present invention is not limited to the above-described embodiments, and when only one of the connection method between the positive electrode can 11 and the positive electrode tab 21 and the connection method between the negative electrode can 12 and the negative electrode tab 22 is the above-described electrical connection method, the other connection method may be any connection method that can achieve electrical connection between an electrode tab and a corresponding electrode can, such as a physical connection method in which the electrode tab is directly connected by a conductive adhesive or is merely surface-contacted. 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 (12)
1. 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 by positive plate, negative pole piece, diaphragm layer form stack or coiling form, 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 pole shell electricity again: any one of the electric connection mode between the positive electrode lug and the positive electrode shell and the electric connection mode between the negative electrode lug and the negative electrode shell comprises the following steps:
s1: preparing a metal sheet, wherein one surface of the metal sheet is a welding surface, and the other surface of the metal sheet is a non-welding surface, coating 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 and the inner surface of the pole shell together;
s2: and welding one end of the electrode tab extending out of the battery cell on the welding surface of the metal sheet to form a welding spot between the electrode tab and the metal sheet, and forming at least 1 pair of welding spots between the electrode tab and the metal sheet in the step S1 by a resistance welding mode of parallel welding.
2. The method for manufacturing the button cell according to claim 1, wherein: in step S1, a conductive adhesive is uniformly applied to the non-soldering surface of the metal sheet in all directions.
3. The method for manufacturing the button cell as claimed in claim 1, wherein the method comprises the following steps: 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.
4. The method for manufacturing the button cell according to claim 1, wherein one of the connection mode between the positive electrode tab and the positive electrode shell and the connection mode between the negative electrode tab and the negative electrode shell comprises the following steps:
s1: preparing a metal sheet, wherein one surface of the metal sheet is a welding surface, and the other surface of the metal sheet is a non-welding surface, coating 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 and the inner surface of the pole shell together;
s2: welding one end of the electrode tab, which extends out of the battery cell, on the welding surface of the metal sheet, forming a welding spot between the electrode tab and the metal sheet, and forming at least 1 pair of welding spots between the electrode tab and the metal sheet in the step S1 in a resistance welding mode of parallel welding;
the other tab and the pole shell are connected in the following mode: and the electrode tabs are directly welded and fixed on the inner surface of the corresponding pole shell.
5. The manufacturing method of the button cell as claimed in claim 4, wherein: when the positive electrode shell and the negative electrode shell are not buckled, the electrode tabs are directly welded and fixed on the inner surface of the corresponding electrode shell by the resistance welding mode of parallel welding on the inner side of the electrode shell.
6. 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 mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, wherein 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; its characterized in that, connection structure between positive shell and the anodal utmost point ear and connection structure between negative pole shell and the negative pole utmost point ear in at least anodal shell and the anodal connection structure between utmost point ear do: one end of the electrode lug extending out of the battery cell is fixedly connected with the outer surface of a metal sheet through a welding point, and the metal sheet is fixedly arranged on the inner surface of the electrode shell corresponding to the electrode lug through a conductive adhesive layer, so that a positive metal sheet and a positive conductive adhesive layer are arranged between the positive electrode shell and the positive electrode lug; and the positive pole metal sheet covers the battery core, and the outer edge of the positive pole metal sheet vertically extends towards the outside direction of the battery core to form an annular flange.
7. The button cell according to claim 6, wherein the connection structure between the negative electrode tab and the negative electrode case is as follows: the electrode tabs are directly welded with the corresponding electrode shells.
8. A button cell according to claim 7, wherein: the electrode tabs are directly welded and connected with the corresponding electrode shells through a pair of welding points.
9. A button cell according to claim 6, 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.
10. A button cell according to claim 6, wherein: the section of the annular flange is L-shaped or I-shaped.
11. A button cell according to claim 6, 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.
12. A button cell according to claim 6, 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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| CN113013527B (en) * | 2021-02-25 | 2022-10-14 | 东莞小锂新能源科技有限公司 | Novel button battery and manufacturing and mounting method of shell sealing element structure |
| CN113381132B (en) * | 2021-06-03 | 2023-03-14 | 珠海冠宇电池股份有限公司 | Multi-tab battery cell and battery |
| CN114122632A (en) * | 2021-10-26 | 2022-03-01 | 上海道赢实业有限公司 | Conductive connection structure replacing tab welding, full-tab battery and preparation process thereof |
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| JP2015088376A (en) * | 2013-10-31 | 2015-05-07 | 日立マクセル株式会社 | Battery unit and charging system |
| CN210224213U (en) * | 2019-08-23 | 2020-03-31 | 重庆市紫建电子有限公司 | Winding type button battery with integrated insulation tabs |
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| CN101728574A (en) * | 2009-12-04 | 2010-06-09 | 王昉 | Buckled lithium-ion storage battery with single-wall structure |
| CN102117895A (en) * | 2010-11-19 | 2011-07-06 | 广州市鹏辉电池有限公司 | Positive steel shell of button lithium battery and button lithium battery |
| CN206250307U (en) * | 2016-11-29 | 2017-06-13 | 珠海市至力电池有限公司 | A kind of chargeable lithium ion button cell |
| CN206516715U (en) * | 2017-02-10 | 2017-09-22 | 东莞市鹏威能源科技有限公司 | A kind of button cell of new winding electrode |
| CN210006779U (en) * | 2019-05-15 | 2020-01-31 | 广东微电新能源有限公司 | Button type battery |
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| CN111048730A (en) * | 2019-12-30 | 2020-04-21 | 漳州万宝能源科技股份有限公司 | Internal connection structure of button cell and manufacturing method thereof |
| CN210379131U (en) * | 2020-02-27 | 2020-04-21 | 比亚迪股份有限公司 | Button cell |
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| JP2015088376A (en) * | 2013-10-31 | 2015-05-07 | 日立マクセル株式会社 | Battery unit and charging system |
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