CN111370635B - Production method of button cell without welding trace and prepared button cell - Google Patents
Production method of button cell without welding trace and prepared button cell Download PDFInfo
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- CN111370635B CN111370635B CN202010334725.XA CN202010334725A CN111370635B CN 111370635 B CN111370635 B CN 111370635B CN 202010334725 A CN202010334725 A CN 202010334725A CN 111370635 B CN111370635 B CN 111370635B
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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
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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
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a production method of a button cell without welding marks and the button cell manufactured by the production method, wherein the welding method between one electrode lug of positive and negative electrode lugs and a corresponding electrode shell comprises the following steps: firstly preparing a metal sheet, welding one end of an electrode tab extending out of a battery core on the metal sheet, forming a first welding spot between the electrode tab and the metal sheet, then horizontally placing the metal sheet in a pole shell, then preparing first resistance welding equipment which comprises two first needle electrodes, jacking the metal sheet on the inner surface of the pole shell, respectively jacking the two first needle electrodes at different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and the electrode tab, and electrifying the two first needle electrodes in the step to realize the fixed connection of the pole shell and the metal sheet; and the other electrode lug of the positive electrode lug and the negative electrode lug is directly welded with the inner surface of the corresponding electrode shell through a third welding point to realize electric connection.
Description
Technical Field
The invention relates to the field of button cells, in particular to a production method of a button cell without welding marks and the prepared button cell.
Background
Button cells (button cells) are also called button cells, and are cells having a larger outer dimension like a small button, and generally have a larger diameter and a thinner thickness (compared with cylindrical cells such as 5 AA on the market), the button cells are classified from the outer dimension into cylindrical cells, prismatic cells, and shaped cells.
Button cells include stacked and wound cells. The basic structure of the winding button cell is as follows: the battery comprises a first pole shell, a second pole shell, an insulating sealing ring and an electric core, wherein the upper opening and the lower opening of the first pole shell are oppositely buckled with each other 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 a containing cavity is formed among the first pole shell, the second pole shell and the insulating sealing ring; the electric core is located in the holding chamber, the electric core includes 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 the electric core, the center of electric core is formed with axial cavity, be equipped with first output conductor on the first pole piece, first output conductor stretches out and welds with first utmost point shell from the electric core, be equipped with the second output conductor on the second pole piece, the second output conductor stretches out and welds with the second utmost point shell from the electric core. When the existing winding type button battery is manufactured, the first output conductor of the battery core is bent to enable the first output conductor to be closely attached to the lower surface of the battery core, and the first output conductor extends to the position right below the axial cavity; then vertically loading the battery cell into the first pole shell; welding the first output conductor and the first pole shell together by means of electric resistance welding by vertically inserting a welding pin downwards into the axial cavity and pressing the first output conductor on the first shell, or welding the first pole shell and the first output conductor together by means of laser welding by emitting laser from below the first pole shell to the area of the first pole shell, which is overlapped with the first output conductor up and down; welding a second output conductor of the battery core on a second electrode shell, wherein an insulating sealing ring is sleeved outside the second electrode shell; and finally, covering the second pole shell and the insulating sealing ring at the opening of the upper end of the first pole shell together for sealing. One of the first pole shell and the second pole shell forms a battery positive pole loop with the corresponding output conductor and the corresponding battery cell pole piece, and the other pole shell forms a battery negative pole loop with the corresponding output conductor and the corresponding battery cell pole piece. Because the first output conductor and the first polar shell are welded, the current of resistance welding and the laser beam of laser welding can penetrate through the first polar shell, and the welding spots for connecting the first polar shell and the first output conductor are arranged through the first polar shell, the surface flatness and stability of the first polar shell are damaged, and the phenomena of electrolyte leakage, surface bulge and the like are easy to occur at the welding spot position of the first polar shell in the use process of the battery.
Disclosure of Invention
The invention aims to provide a production method of a button cell without welding marks, which can keep the surface of a pole shell smooth and intact, and further avoid the phenomena of electrolyte leakage, surface bulge and the like.
The button cell comprises two electrode shells which are cup-shaped, wherein the two electrode shells can be oppositely buckled with each other through upper and lower openings to form a cylindrical button cell shell; the battery cell is packaged in the cylindrical button battery shell in a matching way, 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 is electrically connected with a positive electrode tab, the positive electrode tab is welded with a positive electrode shell to be electrically connected, the negative plate is electrically connected with a negative electrode tab, the negative electrode tab is welded with a negative electrode shell to be electrically connected, and the welding method between one electrode tab of the positive electrode tab and the negative electrode tab and the corresponding electrode shell comprises the following steps:
s1: preparing a metal sheet, welding one end of an electrode tab extending out of the battery core on the metal sheet, forming a first welding spot between the electrode tab and the metal sheet, and then horizontally placing the metal sheet in the electrode shell;
s2: preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first needle electrodes, a metal sheet is propped against the inner surface of a pole shell, the two first needle electrodes are respectively propped against different positions on the outer surface of the metal sheet except for the welding positions of the metal sheet and an electrode lug in the step S1, then the two first needle electrodes in the step are electrified to realize the fixed connection of the pole shell and the metal sheet, the welding step in the step S2 is carried out for 1 time or more, at least 1 pair of second welding spots are formed between the metal sheet and the pole shell, and the welding positions of the metal sheet and the pole shell in the step S2 can be overlapped in different times;
and the other electrode lug of the positive electrode lug and the negative electrode lug is directly welded with the inner surface of the corresponding electrode shell through a third welding point to realize electric connection.
According to the welding method between one electrode tab and the corresponding electrode shell in the positive electrode tab and the negative electrode tab, before the metal sheet is installed in the electrode shell, one end of the electrode tab, which extends out of the battery core, is welded on the metal sheet, after the metal sheet is installed in the electrode shell, the metal sheet is welded on the electrode shell from the inside of the electrode shell in a parallel welding resistance welding mode, meanwhile, two first needle electrodes which limit resistance welding are welded on the outer surface of the metal sheet outside the welding positions of the metal sheet and the electrode tab respectively, after the two first needle electrodes are electrified, an annular welding current channel is formed between the two first needle electrodes, welding current does not penetrate through the electrode shell, so that a molten pool and welding spots are formed only on the inner side of the electrode shell, the appearance of the electrode shell is kept complete, the risk of battery leakage caused by the rupture of the welding spots is avoided, and at least 1 pair of second welding spots are formed between the metal sheet and the electrode shell, the connection stability between the metal sheet and the electrode shell is better, meanwhile, the number of the welding spots between the metal sheet and the electrode shell is high, and the overall contact between the metal sheet and the electrode shell is better in view of the internal resistance between the electrode shell and the metal sheet and the electrode shell is smaller than the internal resistance between the electrode shell and the electrode shell, and the battery is more in the overall contact between the internal resistance and the battery is smaller than the internal resistance between the electrode shell and the internal resistance is more in the overall contact between the internal resistance and the battery; in addition, the welding quality between the electrode lug and the electrode shell is also conveniently detected, and the cold joint is avoided; and the other electrode tab is directly welded and fixed with the corresponding electrode shell, so that the welding operation is simple and efficient.
Preferably, the welding method of the other electrode tab and the corresponding electrode shell comprises the following steps: preparing a second resistance welding device, wherein the second resistance welding device comprises two second needle-shaped electrodes, the electrode lugs are propped against the inner surface of the electrode shell, then the two second needle-shaped electrodes are respectively propped against different positions of the outer surface of the electrode lugs, then the two second needle-shaped electrodes in the step are electrified, the electrode lugs are welded on the inner surface of the corresponding electrode shell, and a pair of third welding spots are formed between the electrode lugs and the corresponding electrode shell. The other electrode tab and the corresponding electrode shell are directly welded together in a parallel welding resistance welding mode, the welding operation is more convenient, the third welding spot cannot penetrate the corresponding electrode shell, and the outer surface of the electrode shell is smooth and intact. The production method of the button cell of the invention can also be as follows: the two second needle-shaped electrodes are respectively propped against the outer surface of the electrode lug, and then the electrode lug is propped against the inner surface of the electrode shell.
Preferably, the step S2 is continuously performed for 1-3 times, so that 1-3 pairs of second welding spots are formed between the metal sheet and the pole shell, and the operation cost is reduced as much as possible and the working efficiency is improved while the metal sheet and the pole shell are reliably welded together.
Preferably, the contact positions of the two first needle electrodes and the metal sheet in the different sub-steps S2 are not overlapped, so that the trouble of needle pulling caused by the fact that the needle electrodes are bonded with the metal sheet due to expansion of a molten pool when the second welding spots in the different sub-steps S2 are overlapped is avoided.
In the specific implementation process, in step S2, the two first needle electrodes of the resistance welding may be pressed against different positions on the outer surface of the metal sheet except the welding position of the metal sheet and the electrode tab, and then the metal sheet may be pressed against the inner surface of the electrode shell.
In the specific implementation process, in the step S1, any one of laser welding or resistance welding is adopted between the metal sheet and the electrode tab.
In the specific implementation process, the sequence of the step S1 is changed with that of the step S2, and at least 1 pair of first welding spots are formed between the electrode tab and the metal sheet in the step S1 in a parallel welding manner.
The second object of the invention is to provide a button cell without welding trace, which 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 cup-shaped, and the upper opening and the lower opening of the positive electrode shell and the lower opening of the negative electrode shell are oppositely buckled to form a cylindrical button cell 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 a containing 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 layering or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive electrode tab, the positive electrode tab is electrically connected with a positive electrode shell, the negative plate is electrically connected with a negative electrode tab, and the negative electrode tab is electrically connected with a negative electrode shell; the connection structure between one of the positive electrode tab and the negative electrode tab and the corresponding electrode shell is as follows: one end of the electrode lug, which extends out of the battery core, is fixedly connected with the outer surface of a metal sheet through a first welding spot, the metal sheet is horizontally and fixedly arranged on the inner surface of the corresponding electrode shell through second welding spots, the number of the second welding spots is more than or equal to 1 pair, the second welding spots of different pairs can be overlapped, the two second welding spots of the same pair are arranged in a staggered manner, and meanwhile, the first welding spots and the second welding spots are arranged in a staggered manner; the connection structure between the other electrode tab and the corresponding electrode shell in the positive electrode tab and the negative electrode tab is as follows: the electrode lugs are directly and fixedly connected with the inner surfaces of the corresponding electrode shells through a pair of third welding spots.
In the button battery, the first welding spots and the second welding spots in the welding structure between one electrode lug and the corresponding electrode shell in the positive electrode lug and the negative electrode lug are positioned on the inner side of the electrode shell, the outer surface of the electrode shell is kept smooth and intact, the number of the second welding spots between the metal sheet and the corresponding electrode shell is large, the connection between the electrode shell and the metal sheet is firmer, the contact internal resistance is smaller, meanwhile, the number of the third welding spots between the electrode lug and the corresponding electrode shell is large, the connection between the electrode lug and the electrode shell is firmer, the contact internal resistance is small, and the contact internal resistance is small, thereby being beneficial to improving the discharge efficiency of the battery; meanwhile, the other electrode lug of the positive electrode lug and the negative electrode lug is directly welded and fixed with the corresponding electrode shell, and the welding operation is convenient and efficient.
Preferably, all the second welding spots are uniformly distributed around the circumference by taking the center of the pole shell as the center of the circle. More preferably, the second welding spots of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is facilitated.
Preferably, 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, the second welding spot is positioned on the metal sheet outside the covering area of the axial cavity of the battery cell, and the welding operation between the metal sheet and the pole shell is more convenient;
preferably, the third welding spot is positioned on the corresponding electrode shell outside the coverage area of the axial cavity of the battery cell, and the welding operation is more convenient.
Drawings
Fig. 1 is a schematic diagram of a welding structure between a negative electrode tab and a metal sheet in any one of embodiments 1 to 3, wherein the metal sheet is a cross-sectional structure diagram;
fig. 2 is a schematic diagram of a welded structure of a negative electrode case and a metal sheet according to any one of embodiments 1 to 3, wherein the negative electrode case and the metal sheet are both cross-sectional structure diagrams;
fig. 3 is a schematic diagram of a welding structure of a positive electrode tab and a positive electrode shell in any one of embodiments 1 to 3, wherein the positive electrode shell, the negative electrode shell and the metal sheet are all cross-sectional structure diagrams;
FIG. 4 is a top view of the pole housing of example 1;
fig. 5 is a schematic cross-sectional structure of the button cell without weld mark of either of examples 1 and 2;
FIG. 6 is a top view of the pole case of example 2;
FIG. 7 is a top view of the pole case of example 3;
FIG. 8 is a schematic cross-sectional structure of a button cell without weld marks in example 3; wherein the dotted circle 60 in fig. 4, 6, 7 indicates the point location of the second solder joint.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings:
example 1
Referring to fig. 1-5, a method for producing a button cell without welding marks comprises two electrode shells (11, 12), wherein the electrode shells (11, 12) are cup-shaped, and the electrode shells (11, 12) can be oppositely buckled with each other through upper and lower openings to form a cylindrical button cell shell; the battery cell 30 is packaged in the cylindrical button battery shell in a matching way, 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 tab 21, the positive tab 21 is welded with a positive shell 11 to realize electrical connection, the negative plate 32 is electrically connected with a negative tab 22, the negative tab 22 is welded with a negative shell 12 to realize electrical connection, and the welding method between the negative tab 22 and the negative shell 12 comprises the following steps:
s1: preparing a metal sheet 40, welding one end of the negative electrode tab 22 extending out of the battery cell on the metal sheet 40, forming a first welding spot 50 between the negative electrode tab 22 and the metal sheet 40, and then horizontally placing the metal sheet 40 in the negative electrode shell 11;
s2: pressing the metal sheet 40 on the inner surface of the negative electrode shell 11, preparing a first resistance welding device, wherein the first resistance welding device comprises two first needle electrodes (100, 200), pressing the two first needle electrodes (100, 200) on different positions on the outer surface of the metal sheet 40 except for the welding position of the metal sheet 40 and the negative electrode tab 22 in the step S1 respectively, then electrifying the two first needle electrodes (100, 200) in the step to realize the fixed connection of the negative electrode shell 12 and the metal sheet 40, performing the welding step in the step S2 for 1 time or more, forming at least 1 pair of second welding spots 60 between the metal sheet 40 and the negative electrode shell 11, and overlapping the welding positions of the metal sheet 40 and the negative electrode shell in the step S2; the outer contour line 40 'of the coverage area of the metal sheet 40 on the negative electrode shell is positioned outside the outer contour line 34' of the coverage area of the axial cavity 34 of the cell, and the second welding spot 60 is positioned on the metal sheet 40 outside the coverage area of the axial cavity 34 of the cell;
step S2 is performed only once, and the number of second welding spots 60 is 1 pair;
the welding method between the positive electrode tab 21 and the positive electrode shell 11 is as follows: preparing a second resistance welding device, wherein the second resistance welding device comprises two second needle-shaped electrodes (400 and 500), the positive electrode lug 21 is propped against the inner surface of the positive electrode shell 11, then the two second needle-shaped electrodes (400 and 500) are respectively propped against different positions of the outer surface of the positive electrode lug 21, then the two second needle-shaped electrodes (400 and 500) in the step are electrified, the positive electrode lug 21 is welded on the inner surface of the positive electrode shell 11, a pair of third welding spots 300 are formed between the positive electrode lug 21 and the positive electrode shell 11, and the positive electrode lug 21 and the positive electrode shell 11 are directly welded to realize electric connection.
The invention only forms a molten pool and welding spots on the inner side of the cathode shell 12, thereby keeping the appearance of the cathode shell 12 complete, avoiding the risk of battery leakage caused by welding spot breakage, forming at least 1 pair of second welding spots 60 between the metal sheet 40 and the cathode shell 12, ensuring better connection stability between the metal sheet 40 and the cathode shell 12, simultaneously, ensuring more welding spots between the metal sheet 40 and the cathode shell 12, reducing the contact internal resistance between the metal sheet 40 and the cathode shell 12 and increasing the discharge efficiency of the battery; in addition, the welding quality between the cathode tab 22 and the metal sheet 40 and between the metal sheet 40 and the cathode shell 12 is conveniently detected, the cold joint is avoided, in addition, the direct welding between the anode tab 21 and the anode shell 11 is also more convenient and efficient in welding operation.
Referring to fig. 1 to 5, the button cell without weld mark manufactured by the method for manufacturing the button cell without weld mark according to embodiment 1 comprises a positive electrode case 11, a negative electrode case 12, an insulating seal ring 70 and a battery cell 30, wherein the positive electrode case 11 and the negative electrode case 12 are cup-shaped, and the upper opening and the lower opening of the positive electrode case 11 and the lower opening of the negative electrode case 12 are opposite to each other to form a cylindrical button cell housing; a gap is reserved between the positive electrode shell 11 and the negative electrode shell 12, the gap is filled with an insulating sealing ring 70 to electrically isolate the positive electrode shell 11 from the negative electrode shell 12, and a containing 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 tab 21, the positive tab 21 is electrically connected with the positive shell 11, the negative plate 32 is electrically connected with a negative tab 22, and the negative tab 22 is electrically connected with the negative shell 12; the connection structure between the negative electrode tab 22 and the negative electrode case 12 is: one end of the negative electrode tab 22 extending out of the battery core 30 is fixedly connected with the outer surface of a metal sheet 40 through a first welding spot 50, the metal sheet 40 is horizontally and fixedly arranged on the inner surface of the negative electrode shell 12 through second welding spots 60, the number of the second welding spots 60 is more than or equal to 1 pair, the second welding spots 60 of different pairs can be overlapped, the two second welding spots 60 of the same pair are arranged in a staggered mode, and meanwhile, the first welding spot 50 and the second welding spot 60 are arranged in a staggered mode; the connection structure between the other positive electrode tab 21 and the positive electrode case 11 is: the positive electrode tab 21 is fixedly connected to the inner surface of the positive electrode can 11 through a pair of third welding spots 300.
Example 2
As shown in fig. 6, the production method of the weld mark-free button cell of example 2 is different from that of example 1 in that: step S2 of the welding method between the anode tab 22 and the anode casing 12 is continuously performed 2 times, 2 pairs of second welding spots 60 are formed between the metal sheet 40 and the anode casing 12, and two welding positions among the welding positions of the metal sheet 40 and the anode casing 12 in different steps S2 are overlapped; in the welding method between the positive electrode tab 21 and the positive electrode case 11, the positive electrode tab 21 was welded to the positive electrode case 11 by means of resistance welding by butt welding, and 2 third welding spots 300 were formed between the positive electrode tab 21 and the positive electrode case 11, and the other steps were the same as in example 1.
As shown in fig. 6, the weld mark-free button cell according to example 2 is different from the weld mark-free button cell of example 1 in that: the number of the second welding spots 60 is 2 pairs, and two second welding spots 60 among the second welding spots 60 of different pairs are overlapped, and the rest of the structure is the same as that of embodiment 1.
Example 3
Referring to fig. 7 and 8, the method for producing the weld mark-free button cell of example 3 is different from the method for producing the weld mark-free button cell of example 1 in that: step S2 is continuously performed 3 times in the welding method between the cathode tab 22 and the cathode casing 12, 3 pairs of second welding spots 60 are formed between the metal sheet 40 and the cathode casing 12, and the welding positions of the metal sheet 40 and the cathode casing 12 in different steps S2 are not overlapped; in the welding method between the positive electrode tab 21 and the positive electrode case 11, the positive electrode tab 21 was welded to the positive electrode case 11 by means of resistance welding by butt welding, and 1 third welding spot 300 was formed between the positive electrode tab 21 and the positive electrode case 11, and the other steps were the same as in example 1.
Referring to fig. 7 and 8, the weld mark-free button cell according to example 3 is different from the weld mark-free button cell of example 1 in that: the number of the second welding spots 60 is 3 pairs, and the second welding spots 60 of different pairs are not overlapped, the positive electrode tab 21 is fixedly connected with the inner surface of the positive electrode case 11 through one third welding spot 300, and the rest of the structure is the same as that of embodiment 1.
The button cells without welding traces in the embodiment 2 and the embodiment 3 only form a molten pool and a welding spot on the inner side of the negative electrode shell 12, so that the appearance of the negative electrode shell 12 is kept complete, the risk of battery leakage caused by welding spot breakage is avoided, 2-3 pairs of second welding spots 60 are formed between the metal sheet 40 and the negative electrode shell 12, the connection stability between the metal sheet 40 and the negative electrode shell 12 is better, meanwhile, the contact internal resistance between the metal sheet 40 and the negative electrode shell 12 is small, the discharge efficiency of the battery is improved, meanwhile, a third welding spot 300 of 1 pair is formed between the positive electrode tab 21 and the positive electrode shell 11 in the embodiment 2, the connection stability between the positive electrode tab 21 and the positive electrode shell 11 is better, and meanwhile, the contact internal resistance between the positive electrode tab 21 and the positive electrode shell 11 is smaller; in addition, the welding operation between the positive electrode tab and the positive electrode case in example 2 and example 3 is more convenient and efficient.
The positive electrode tab 21 and the positive electrode case 11 of embodiment 1 may be electrically connected by direct welding by other common welding methods such as laser welding.
The present invention is not limited to the production method of the weld mark-free button cell and the method of the weld mark-free button cell of examples 1 to 3, and the "negative electrode is provided with the metal sheet 40, the negative electrode tab 22 is indirectly welded to the negative electrode case 12 through the metal sheet 40, the positive electrode is not provided with the metal sheet, the positive electrode tab 21 is directly welded to the positive electrode case 11", but may also be the "positive electrode is provided with the metal sheet, the positive electrode tab 21 is indirectly welded to the positive electrode case 11 through the metal sheet, the negative electrode is not provided with the metal sheet, and the negative electrode tab 22 is directly welded to the negative electrode case 12".
In general, the positive electrode tab and the negative electrode tab are metal foils capable of being bent at will.
In the method for producing the button cell without welding trace of embodiments 1 to 3, in step S2, two needle electrodes (100, 200) of the resistance welding may be respectively pressed against different positions on the outer surface of the metal sheet 40 except the welding position of the metal sheet 40 and the electrode tab, and then the metal sheet 40 may be pressed against the inner surface of the electrode case 10. In a specific implementation process, in step S1 of the method for welding the button cell electrode shell and the electrode tab in a seamless manner, any one of laser welding or resistance welding is adopted between the metal sheet 40 and the electrode shell 10.
The production method of the button cell without welding trace and the button cell without welding trace of examples 1 to 3 can be improved as follows:
(1) As shown in fig. 3, 5 and 6, in the seamless welding structure of the button cell electrode case and the electrode tab of the present invention, all the second welding spots 60 are uniformly distributed around the circumference with the center of the electrode case 10 as the center. More preferably, the second welding spots of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is facilitated;
(2) The outer contour line 40 'of the metal sheet 40 is located outside the outer contour line 34' of the coverage area of the axial cavity 34 of the battery cell, the second welding point 60 is located on the metal sheet 40 outside the coverage area of the axial cavity 34 of the battery cell, and the welding operation between the metal sheet 40 and the polar shell is more convenient;
(4) The third welding spot 300 is located on the corresponding electrode shell outside the coverage area of the axial cavity 34 of the electric motor, so that the welding operation is more convenient.
The method for welding the button cell electrode case and the electrode tab in example 1 is a preferred embodiment of the present invention, however, the method for welding the button cell electrode case and the electrode tab in the present invention may also be "the sequence of step S1 and step S2 is changed, and at least 1 pair of first welding spots 50" (the manufactured welding structure is shown in fig. 8) are formed between the electrode tab 22 and the metal sheet 40 in step S1 by a parallel welding resistance welding method, and others.
It should be noted that, the number of repetitions of step S2 in the method for producing a button cell without solder marks according to the present invention is not limited to the specific number of repetitions in the embodiment, and the number of repetitions of step S2 may be adjusted according to the setting of the soldering position and the requirement of soldering firmness. Meanwhile, the first welding spot 50 of the present invention is not limited to 1 welding spot in the drawings, and may be 2 or more than 2 welding spots. The structure of the battery cell 30 of the present invention is not limited to the specific structure shown in the drawings, and any battery cell structure may be used.
Claims (12)
1. The button cell comprises two electrode shells which are cup-shaped, wherein the two electrode shells can be oppositely buckled with each other through upper and lower openings to form a cylindrical button cell shell; the battery cell is packaged in the cylindrical button battery shell in a matching way, 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 is electrically connected with a positive electrode lug, the positive electrode lug is welded with a positive electrode shell to be electrically connected, the negative plate is electrically connected with a negative electrode lug, and the negative electrode lug is welded with a negative electrode shell to be electrically connected, and the welding method between one electrode lug of the positive electrode lug and the negative electrode lug and the corresponding electrode shell comprises the following steps:
s1: preparing a metal sheet, welding one end of an electrode tab extending out of the battery core on the metal sheet, forming a first welding spot between the electrode tab and the metal sheet, and then horizontally placing the metal sheet in the electrode shell;
s2: preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first needle electrodes, a metal sheet is propped against the inner surface of a pole shell, the two first needle electrodes are respectively propped against different positions on the outer surface of the metal sheet except for the welding positions of the metal sheet and an electrode lug in the step S1, then the two first needle electrodes in the step are electrified to realize the fixed connection of the pole shell and the metal sheet, the welding step in the step S2 is carried out for 1 time or more, at least 1 pair of second welding spots are formed between the metal sheet and the pole shell, and the welding positions of the metal sheet and the pole shell in the step S2 can be overlapped in different times;
and the other electrode lug of the positive electrode lug and the negative electrode lug is directly welded with the inner surface of the corresponding electrode shell through a third welding point to realize electric connection.
2. The method for producing a button cell without weld marks according to claim 1, wherein the welding method of the other electrode tab and the corresponding electrode case is as follows: preparing a second resistance welding device, wherein the second resistance welding device comprises two second needle-shaped electrodes, the electrode lugs are propped against the inner surface of the electrode shell, then the two second needle-shaped electrodes are respectively propped against different positions of the outer surface of the electrode lugs, then the two second needle-shaped electrodes in the step are electrified, the electrode lugs are welded on the inner surface of the corresponding electrode shell, and a pair of third welding spots are formed between the electrode lugs and the corresponding electrode shell.
3. The method for producing a button cell without weld marks according to claim 1, wherein: step S2 is continuously performed for 1-3 times.
4. The method for producing a button cell without weld marks according to claim 1, wherein: the contact positions of the two first needle electrodes and the metal sheet in the different sub-steps S2 are not overlapped.
5. The method for producing a button cell without weld marks according to claim 1, wherein: in the step S2, the two first needle electrodes of the resistance welding are respectively propped against different positions on the outer surface of the metal sheet except the welding position of the metal sheet and the electrode lug, and then the metal sheet is propped against the inner surface of the electrode shell.
6. The method for producing a button cell without weld marks according to claim 1, wherein: in the step S1, the metal sheet and the electrode tab are welded by adopting any one of laser welding or resistance welding.
7. The production method of the button cell without welding marks according to any one of claims 1 to 5, wherein the production method is characterized by comprising the following steps: the sequence of the step S1 is changed with that of the step S2, and at least 1 pair of first welding spots are formed between the electrode lugs and the metal sheets in the step S1 in a parallel welding manner.
8. A button cell without welding trace comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a cell, wherein the positive electrode shell and the negative electrode shell are cup-shaped, and the upper opening and the lower opening of the positive electrode shell and the lower opening of the negative electrode shell are oppositely buckled to form a cylindrical button cell 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 a containing 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 layering or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive electrode tab, the positive electrode tab is electrically connected with a positive electrode shell, the negative plate is electrically connected with a negative electrode tab, and the negative electrode tab is electrically connected with a negative electrode shell; the method is characterized in that the connection between one electrode tab and the corresponding electrode shell in the positive electrode tab and the negative electrode tab is performed by adopting the welding method of the one electrode tab and the metal sheet in the production method of the button cell without welding trace in any one of claims 1-6, and the connection structure between the one electrode tab and the corresponding electrode shell is as follows: one end of the electrode lug, which extends out of the battery core, is fixedly connected with the outer surface of a metal sheet through a first welding spot, the metal sheet is horizontally and fixedly arranged on the inner surface of the corresponding electrode shell through second welding spots, the number of the second welding spots is more than or equal to 1 pair, the second welding spots of different pairs can be overlapped, the two second welding spots of the same pair are arranged in a staggered manner, and meanwhile, the first welding spots and the second welding spots are arranged in a staggered manner; the connection structure between the other electrode tab and the corresponding electrode shell in the positive electrode tab and the negative electrode tab is as follows: the electrode lugs are directly and fixedly connected with the inner surfaces of the corresponding electrode shells through a pair of third welding spots.
9. The weld mark free button cell defined in claim 8, wherein: all the second welding spots are uniformly distributed around the circumference by taking the center of the pole shell as the center of the circle.
10. The weld mark free button cell defined in claim 9, wherein: the second pads of each pair are symmetrically distributed.
11. The weld mark free button cell defined in claim 8, 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 second welding spot is positioned on the metal sheet outside the covering area of the axial cavity of the battery cell.
12. The weld mark free button cell defined in claim 8, wherein: and the third welding spot is positioned on the corresponding electrode shell outside the coverage area of the axial cavity of the battery cell.
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| CN111900274A (en) * | 2020-08-04 | 2020-11-06 | 珠海冠宇电池股份有限公司 | Button cell and preparation method thereof |
| CN111922497A (en) * | 2020-08-10 | 2020-11-13 | 广东维都利新能源有限公司 | External butt-welding method and button battery |
| CN112881922A (en) * | 2020-12-30 | 2021-06-01 | 天津国安盟固利新材料科技股份有限公司 | Button lithium battery and method for detecting assembling quality of button lithium battery |
| CN113809482A (en) * | 2021-09-15 | 2021-12-17 | 珠海冠宇电池股份有限公司 | Battery and method for producing battery |
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