CN111354911A - Button battery pole shell and electrode lug traceless welding method, welding structure and product - Google Patents
Button battery pole shell and electrode lug traceless welding method, welding structure and product Download PDFInfo
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- CN111354911A CN111354911A CN202010334059.XA CN202010334059A CN111354911A CN 111354911 A CN111354911 A CN 111354911A CN 202010334059 A CN202010334059 A CN 202010334059A CN 111354911 A CN111354911 A CN 111354911A
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- 238000003466 welding Methods 0.000 title claims abstract description 207
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 123
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 13
- 238000004804 winding Methods 0.000 claims description 9
- 238000010030 laminating Methods 0.000 claims description 3
- 239000004020 conductor Substances 0.000 description 16
- 241000237983 Trochidae Species 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 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
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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 button cell pole shell and electrode tab traceless welding method, a welding structure and a product, wherein the welding method 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, forming a first welding point between the electrode lug and the metal sheet, and then horizontally placing the metal sheet in a pole shell; and then, pressing the metal sheet on the inner surface of the electrode shell, respectively pressing two needle-shaped electrodes of resistance welding at different positions on the outer surface of the metal sheet outside the welding position of the metal sheet and the electrode lug, electrifying the two needle-shaped electrodes in the step to realize the fixed connection of the electrode shell and the metal sheet, wherein the outer contour line of the metal sheet covering area on the electrode shell is positioned outside the outer contour line of the axial cavity covering area of the electric core, and the second welding point is positioned on the metal sheet outside the axial cavity covering area of the electric core. The welding structure manufactured by the welding method is complete in surface with the pole shell of the button cell product, and welding is convenient.
Description
Technical Field
The invention relates to a button cell pole shell and electrode tab traceless welding method, a welding structure and a product.
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 battery positive pole loop of the battery, and the other pole shell, the corresponding output conductor and the corresponding battery cell pole piece form a battery negative pole loop of the battery. Because first output conductor and first utmost point shell welding time, the electric current that resistance welded and the laser beam of laser welding all can pierce through first utmost point shell, and the solder joint of connecting first utmost point shell and first output conductor runs through first utmost point shell setting, has destroyed the surface smoothness and the stability of first utmost point shell, and in the battery use, the solder joint position of first utmost point shell appears the weeping and the surface swell phenomenons such as electrolyte easily.
Disclosure of Invention
The invention aims to provide a button battery pole shell and electrode lug traceless welding method, which can avoid the damage to the flatness and stability of the surface of the pole shell, and further avoid electrolyte leakage, surface bulging and the like caused by the damage.
A button battery pole shell and electrode lug seamless welding method is characterized in that the pole shell is cup-shaped, a battery cell is installed in the pole shell and mainly formed by winding a positive plate, a negative plate and a diaphragm, an axial cavity is formed in the center of the battery cell, the positive plate and the negative plate are respectively electrically connected with an electrode lug, and any electrode lug is welded with a corresponding pole shell to realize electrical connection, wherein the welding method comprises 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, forming a first welding point between the electrode lug and the metal sheet, and horizontally placing the metal sheet in a pole shell;
s2: the method comprises the following steps of pressing a metal sheet on the inner surface of a polar shell, respectively pressing two needle-shaped electrodes of resistance welding at different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and an electrode lug, and then electrifying the two needle-shaped electrodes in the step to realize the fixed connection of the polar shell and the metal sheet, wherein the welding step of 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 polar shell, the welding positions of the metal sheet and the polar shell in the step S2 in different times can be overlapped, the outer contour line of the metal sheet covering area on the polar shell is positioned outside the outer contour line of the battery cell axial cavity covering area, and the second welding spots are positioned on the metal sheet outside the battery cell axial cavity covering area.
The invention welds one end of the electrode tab extending out of the electric core on the metal sheet before the metal sheet is arranged in the electrode shell, and welds the metal sheet on the electrode shell in a parallel welding resistance welding mode after the metal sheet is arranged in the electrode shell, and simultaneously limits two needle-shaped electrodes of the resistance welding to respectively perform welding operation on the outer surface of the metal sheet outside the welding position of the metal sheet and the electrode tab, when the two needle-shaped electrodes are electrified, an annular welding current channel can be formed between the two needle-shaped electrodes, the welding current can not penetrate through the electrode shell, so that a molten pool and a welding spot can be formed only on the inner side of the electrode shell, thereby keeping the appearance of the electrode shell complete, avoiding the risk of battery leakage caused by the fracture of the welding spot, 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, and simultaneously, the welding points between the metal sheets and the pole shell are large in number, and because the internal resistance of the welding position between the pole shell and the metal sheets is generally smaller than the internal resistance of the physical contact position between the pole shell and the metal sheets, the overall contact internal resistance between the pole shell and the metal sheets is smaller, and the smaller the contact internal resistance is, the more beneficial to battery discharge is; in addition, the welding quality between the electrode lug and the metal sheet and between the metal sheet and the electrode shell can be conveniently detected, and the insufficient welding is avoided; the outer contour line of the metal sheet covering area on the pole shell is positioned outside the outer contour line of the electric core axial cavity covering area, the second welding spot is positioned on the metal sheet outside the electric core axial cavity covering area, and the welding operation between the metal sheet and the pole shell is more convenient.
Preferably, step S2 is performed continuously for 1-3 times, so as to form 1-3 pairs of second welding points between the metal sheet and the electrode shell, thereby reducing the operation cost and improving the working efficiency as much as possible while ensuring reliable welding between the metal sheet and the electrode shell.
Preferably, the contact positions of the two needle electrodes and the metal sheet in the step S2 in different times are not overlapped, so as to avoid the trouble of needle poking caused by the needle electrodes and the metal sheet being adhered together due to the expansion of the molten pool when the second welding points in the step S2 in different times are overlapped.
In the specific implementation process, in step S2, the two needle-shaped electrodes in the resistance welding may be pressed against different positions on the outer surface of the metal sheet except for 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 step S1, any one of laser welding and resistance welding is used to weld the metal sheets and the electrode tabs.
In a specific implementation process, the sequence of the step S1 and the step S2 may be changed, and at least 1 pair of first welding points is formed between the electrode tab and the metal sheet in the step S1 by resistance welding of parallel welding.
The invention also aims to provide a button battery pole shell and electrode lug traceless welding structure, which comprises a pole shell and an electrode lug, wherein the pole shell is cup-shaped, a battery cell is arranged in the pole shell, the battery cell is mainly formed by winding a positive plate, a negative plate and a diaphragm, an axial cavity is formed in the center of the battery cell, the positive plate and the negative plate are respectively and electrically connected with the electrode lug, one end of any electrode lug, which extends out of the battery cell, is fixedly connected with the outer surface of a metal sheet through a first welding spot, the inner surface of the pole shell corresponding to the any electrode lug is horizontally and fixedly provided with the metal sheet through a second welding spot, 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 spot and the second; the outer contour line of the metal sheet covering area on the pole shell is positioned outside the outer contour line of the battery core axial cavity covering area, and the second welding spot is positioned on the metal sheet outside the battery core axial cavity covering area.
In the button battery pole shell and electrode lug traceless welding structure, the first welding points and the second welding points are positioned on the inner side of the pole shell, the outer surface of the pole shell is kept flat and intact, the number of the second welding points between the pole shell and the metal sheet is large, the connection between the pole shell and the metal sheet is firmer, the contact internal resistance is smaller, the discharge efficiency of the battery is favorably improved, and in addition, the welding operation between the metal sheet and the pole shell is more convenient.
Preferably, all the second welding points are uniformly distributed around the circumference by taking the center of the polar shell as a circle center. More preferably, the second welding points of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is more facilitated.
The invention also aims to provide a button battery, which 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 is a welding structure manufactured by the button battery electrode shell and electrode lug traceless welding method.
Preferably, the connecting structure between the negative electrode shell and the negative electrode lug adopts a welding structure manufactured by the button battery electrode shell and electrode lug traceless welding method. Because most of the existing button battery manufacturing processes use the negative electrode shell as a bottom shell and the positive electrode shell as a top shell, the battery core is firstly arranged in the bottom shell, and then the top shell is arranged corresponding to the cover to assemble the battery, the welding structure manufactured by the button battery pole shell and pole lug seamless welding method between the negative electrode shell and the negative pole lug has stronger operability.
Drawings
FIG. 1 is a schematic view of a welding structure of an electrode tab and a metal sheet according to any one of embodiments 1 to 3, wherein the metal sheet is a cross-sectional structural view;
FIG. 2 is a schematic view of a welding structure of the pole shell and the metal sheet according to any one of embodiments 1 to 3, wherein both the pole shell and the metal sheet are cross-sectional structural diagrams;
FIG. 3 is a top view structural view of a pole case in embodiment 1;
FIG. 4 is a schematic sectional view of a button cell in example 1;
FIG. 5 is a top view structural view of a pole case in embodiment 2;
FIG. 6 is a top view structural view of a pole case in embodiment 3;
FIG. 7 is a schematic sectional view showing a button cell according to example 4;
FIG. 8 is a schematic cross-sectional view of a button cell of the present invention;
wherein the dashed circles 60 in fig. 3, 5, 6 indicate the location of the second weld spot.
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 electrode tab seamless welding method is provided, in which the pole shell 10 is cup-shaped, an electric core 30 is installed in the pole shell 10, the electric core 30 is mainly formed by winding a positive plate 31, a negative plate 32, and a diaphragm 33, an axial cavity 34 is formed at the center of the electric core 30, the positive plate 31 and the negative plate 32 are respectively electrically connected with an electrode tab (21, 22), and any electrode tab 22 is welded with the pole shell 10 to realize electrical connection, and the welding method includes the following steps:
s1: preparing a metal sheet 40, welding one end of the electrode tab 20 extending out of the battery core on the metal sheet 40, forming a first welding point 50 between the electrode tab 20 and the metal sheet 40, and then horizontally placing the metal sheet 40 in the electrode shell 10;
s2: pressing a metal sheet 40 on the inner surface of the electrode shell 10, respectively pressing two needle-shaped electrodes (100, 200) of resistance welding on different positions on the outer surface of the metal sheet 40 except the welding position of the metal sheet 40 and the electrode lug 20, and then electrifying the two needle-shaped electrodes in the step to realize the fixed connection of the electrode shell 10 and the metal sheet 40, wherein the welding step of the step S2 is carried out for 1 time or more, at least 1 pair of second welding points 60 are formed between the metal sheet 40 and the electrode shell 10, and the welding positions of the metal sheet 40 and the electrode shell 10 in different steps S2 can be overlapped; the outer contour line 40 'of the coverage area of the metal sheet 40 on the pole shell 10 is located outside the outer contour line 34' of the coverage area of the cell axial cavity 34, and the second welding point 60 is located on the metal sheet 40 outside the coverage area of the cell axial cavity 34;
step S2 is performed only once, and the number of second welding points 60 is 1 pair.
In the invention, only a molten pool and welding spots are formed on the inner side of the polar shell 10, so that the appearance of the polar shell 10 is kept complete, and the risk of battery leakage caused by welding spot fracture is avoided, at least 1 pair of second welding spots 60 are formed between the metal sheet 40 and the polar shell 10, the connection stability between the metal sheet 40 and the polar shell 10 is better, meanwhile, the number of welding spots between the metal sheet 40 and the polar shell 10 is large, the contact internal resistance between the metal sheet 40 and the polar shell 10 can be reduced, and the discharge efficiency of the battery is increased; moreover, the welding quality between the electrode tab 20 and the metal sheet 40 and between the metal sheet 40 and the electrode shell 10 can be detected conveniently, the cold joint can be avoided, and in addition, the welding operation between the metal sheet 40 and the electrode shell 10 is more convenient.
With reference to fig. 1 to 3, a welded structure manufactured by the button battery pole case and the electrode tab seamless welding method according to embodiment 1 includes a pole case 10 and electrode tabs 20, the pole case 10 is cup-shaped, a battery cell 30 is installed in the pole case 10, the battery cell 30 is mainly formed by winding a positive plate 31, a negative plate 32, and a diaphragm 33, an axial cavity 34 is formed at the center of the battery cell 30, the positive and negative plates (31, 32) are respectively electrically connected to one electrode tab 20, one end of any electrode tab 20 extending out of the battery cell 30 is fixedly connected to an outer surface of a metal sheet 40 through a first welding point 50, the inner surface of the pole case 10 corresponding to any electrode tab 20 is horizontally and fixedly provided with the metal sheet 40 through second welding points 60, the number of the second welding points 60 is 1 pair, different pairs of the second welding points 60 can be overlapped, and two second welding points 60 of the same pair are arranged in a staggered manner, meanwhile, the first welding points 50 and the second welding points 60 are arranged in a staggered manner; the outer contour line 40 'of the area covered by the metal sheet 40 on the pole casing 10 is located outside the outer contour line 34' of the area covered by the cell axial cavity 34, and the second welding point 60 is located on the metal sheet 40 outside the area covered by the cell axial cavity 34.
In the invention, only a molten pool and welding spots are formed on the inner side of the polar shell 10, so that the appearance of the polar shell 10 is kept complete, and the risk of battery leakage caused by welding spot fracture is avoided, moreover, 1 pair of second welding spots 60 are formed between the metal sheet 40 and the polar shell 10, the connection stability between the metal sheet 40 and the polar shell 10 is better, meanwhile, the number of welding spots between the metal sheet 40 and the polar shell 10 is large, the contact internal resistance between the metal sheet 40 and the polar shell 10 can be reduced, the discharge efficiency of the battery is increased, and in addition, the welding operation between the metal sheet 40 and the polar shell 10 is more convenient.
In the button cell electrode shell and electrode tab seamless welding method and welding structure of embodiment 1, the electrode shell 10 is a negative electrode shell, and the electrode tab 20 electrically connected to the electrode shell correspondingly is a negative electrode tab 22 electrically connected to a negative electrode sheet 32; of course, if the button cell electrode shell and the electrode tab have no trace welding method and welding structure, when the electrode shell is a positive electrode shell, the electrode tab 20 electrically connected with the electrode shell correspondingly is the positive electrode tab 21 electrically connected with the positive electrode sheet 31.
As shown in fig. 4, embodiment 1 further provides a button battery, which includes a positive electrode case 11, a negative electrode case 12, an insulating seal ring 70, and a battery cell 30, where the positive electrode case 11 and the negative electrode case 12 are both cup-shaped, and the upper and lower openings of the positive electrode case 11 and the negative electrode case 12 are oppositely buckled to form a cylindrical button battery case; a gap is reserved between the positive electrode shell 11 and the negative electrode shell 12, the insulating sealing ring 70 is filled in the gap to electrically isolate the positive electrode shell 11 from the negative electrode shell 12, and an accommodating cavity is formed among the positive electrode shell 11, the negative electrode shell 12 and the insulating sealing ring 70; the battery cell 30 is arranged in the accommodating cavity, the battery cell 30 is mainly formed by winding a positive plate 31, a negative plate 32 and a diaphragm 33, an axial cavity 34 is formed in the center of the battery cell 30, the positive plate 31 is electrically connected with a positive pole tab 21, the positive pole tab 21 is electrically connected with the positive shell 11, the negative plate 32 is electrically connected with a negative pole tab 22, and the negative pole tab 22 is electrically connected with the negative shell 12; the connection structure between the negative electrode shell 12 and the negative electrode tab 22 adopts a welding structure manufactured by the button cell pole shell and electrode tab traceless welding method according to embodiment 1; the connection structure between the positive electrode shell 11 and the positive electrode tab 21 adopts a welding structure formed by directly welding the positive electrode tab 21 on the inner surface of the positive electrode shell 11 in the inner side of the positive electrode shell 11 in a resistance welding mode of parallel welding, namely, the fixed connection is realized between the inner surface of the positive electrode shell 11 and the positive electrode tab 21 through a third welding point 300, the number of the third welding points 300 is 1 pair, and two third welding points 300 of the same pair are arranged in a staggered mode. Of course, the number of the third solder joints 300 is not limited to 1 pair, and may be 2 pairs or more than 2 pairs.
Example 2
As shown in fig. 5, the coin cell electrode shell and electrode tab seamless welding method of example 2 is different from that of example 1 in that: step S2 was performed 2 times in succession, 2 pairs of second welding points 60 were formed between the metal sheet 40 and the pole case 10, and there was an overlap of two of the welding positions of the metal sheet 40 and the pole case 10 in the different sub-step S2, and the rest of the steps were the same as in example 1.
As shown in fig. 5, the welded structure obtained by the button cell pole case and electrode tab seamless welding method of example 2 is different from the welded structure of example 1 in that: the number of the second pads 60 is 2 pairs, and two of the second pads 60 of different pairs overlap, and the rest of the structure is the same as that of embodiment 1.
Example 3
As shown in fig. 6, the coin cell electrode shell and electrode tab seamless welding method of example 3 is different from that of example 1 in that: step S2 is continuously performed 3 times to form 3 pairs of second welding points 60 between the metal sheet 40 and the pole shell 10, and there is no overlap between the welding positions of the metal sheet 40 and the pole shell 10 in step S2 in different steps, and the rest steps are the same as those in embodiment 1.
As shown in fig. 6, the welded structure obtained by the button cell pole case and electrode tab seamless welding method of example 3 is different from the welded structure of example 1 in that: the number of the second welding points 60 is 3 pairs, and the second welding points 60 of different pairs are not overlapped, and the rest of the structure is the same as that of the embodiment 1.
The welding method and the welding structure of the embodiment 2 and the embodiment 3 only form a molten pool and a welding spot on the inner side of the pole shell 10, so that the appearance of the pole shell 10 is kept complete, the risk of battery leakage caused by welding point fracture is avoided, in addition, 2-3 pairs of second welding spots 60 are formed between the metal sheet 40 and the pole shell 10, the connection stability between the metal sheet 40 and the pole shell 10 is better, meanwhile, the contact internal resistance between the metal sheet 40 and the pole shell 10 is small, the discharge efficiency of the battery is favorably improved, and in addition, the welding operation between the metal sheet 40 and the pole shell 10 is more convenient.
Example 4
As shown in fig. 7, embodiment 4 provides a button battery, which is different from the button battery of embodiment 1 in that: the connection structure between the positive electrode shell 11 and the positive electrode tab 21 also adopts a welding structure manufactured by the button battery pole shell and electrode tab traceless welding method according to embodiment 1.
Generally, the electrode tabs are metal foils that can be bent at will.
In the specific implementation process, in step S2, the two needle-shaped electrodes (100, 200) of the resistance welding may be 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 shell 10. In the specific implementation process, in step S1 of the button cell electrode shell and electrode tab traceless welding method, any one of laser welding and resistance welding is adopted between the metal sheet 40 and the electrode shell 10.
Preferably, as shown in fig. 3, 5 and 6, in the button cell electrode shell and electrode tab traceless welding structure of the present invention, all the second welding points 60 are uniformly distributed around the circumference with the center of the electrode shell 10 as the center of a circle. More preferably, the second welding points of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is more facilitated.
The button cell of the present invention is further preferably: the connecting structure between the negative electrode shell 12 and the negative electrode tab 22 adopts the button cell electrode shell and electrode tab seamless welding structure. Because the negative electrode shell 12 is mostly used as a bottom shell and the positive electrode shell 11 is mostly used as a top shell in the existing button battery manufacturing process, the battery core 30 is firstly installed in the bottom shell, and then the top shell is correspondingly covered to assemble the battery, the welding structure manufactured by the button battery pole shell and electrode pole lug seamless welding method between the negative electrode shell 12 and the negative pole lug 22 is higher in operability.
The coin cell electrode shell and electrode tab seamless welding method in example 1 is a preferred embodiment of the present invention, however, the coin cell electrode shell and electrode tab seamless welding method of the present invention may also be "the sequence of step S1 and step S2 is changed, and at least 1 pair of first welding points 50" is formed between the electrode tab 22 and the metal sheet 40 by resistance welding in parallel welding in step S1 (the resulting welding structure is shown in fig. 8), and others.
It should be noted that, when only one of the connection structure between the positive electrode shell 11 and the positive electrode tab 21 and the connection structure between the negative electrode shell 12 and the negative electrode tab 22 adopts the button cell electrode shell and electrode tab seamless welding structure, the other connection structure may also adopt any one of the existing connection modes that can realize the electrical connection between the electrode tab and the corresponding electrode shell, such as directly gluing the electrode tab on the corresponding electrode shell through conductive adhesive, or physically contacting the electrode tab with the corresponding electrode shell. In addition, the first welding point of the present invention is not limited to 1 welding point in the drawings, and may be 2 or more than 2 welding points. 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 (11)
1. A button battery pole shell and electrode lug seamless welding method is characterized in that the welding method comprises 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, forming a first welding point between the electrode lug and the metal sheet, and horizontally placing the metal sheet in a pole shell;
s2: the method comprises the following steps of pressing a metal sheet on the inner surface of a polar shell, respectively pressing two needle-shaped electrodes of resistance welding at different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and an electrode lug, and then electrifying the two needle-shaped electrodes in the step to realize the fixed connection of the polar shell and the metal sheet, wherein the welding step of 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 polar shell, the welding positions of the metal sheet and the polar shell in the step S2 in different times can be overlapped, the outer contour line of the metal sheet covering area on the polar shell is positioned outside the outer contour line of the battery cell axial cavity covering area, and the second welding spots are positioned on the metal sheet outside the battery cell axial cavity covering area.
2. The button cell pole shell and electrode tab seamless welding method according to claim 1, characterized in that: step S2 is continuously performed for 1-3 times.
3. The button cell pole shell and electrode tab seamless welding method according to claim 1, characterized in that: the contact positions of the two needle electrodes and the metal sheet in the different sub-steps S2 do not overlap.
4. The button cell pole shell and electrode tab seamless welding method according to claim 1, characterized in that: in step S2, the two needle electrodes of the resistance welding are respectively pressed against different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and the electrode tab, and then the metal sheet is pressed against the inner surface of the electrode shell.
5. The button cell pole shell and electrode tab seamless welding method according to claim 1, characterized in that: in step S1, any one of laser welding and resistance welding is used between the metal sheet and the electrode tab.
6. The button cell pole shell and electrode tab traceless welding method according to any one of claims 1 to 4, characterized in that: the sequence of the step S1 is changed from that of the step S2, and at least 1 pair of first welding points are formed between the electrode tab and the metal sheet in the step S1 by resistance welding of parallel welding.
7. A button battery pole shell and electrode lug seamless welding structure comprises a pole shell and an electrode lug, wherein the pole shell is cup-shaped, a battery cell is arranged in the pole 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 the electrode lug, the button battery pole shell is characterized in that one end of any electrode lug, which extends out of the battery cell, is fixedly connected with the outer surface of a metal sheet through a first welding point, the inner surface of the pole shell corresponding to the electrode lug is horizontally and fixedly provided with the metal sheet through a second welding point, the number of the second welding points is more than or equal to 1, different pairs of second welding points can be overlapped, two second welding points of the same pair are arranged in a staggered manner, meanwhile, the first welding point and the second welding points are arranged in a staggered manner, and the outline of the metal sheet covering area on the pole shell is positioned outside the outline of the axial, the second welding spot is positioned on the metal sheet outside the covering area of the axial cavity of the battery core.
8. The button cell pole shell and electrode tab traceless welding structure of claim 7, wherein: all the second welding points are uniformly distributed around the circumference by taking the center of the polar shell as a circle center.
9. The button cell pole shell and electrode tab traceless welding structure of claim 8, wherein: the second welding points of each pair are symmetrically distributed.
10. A button battery comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery cell, wherein the positive electrode shell and the negative electrode shell are both cup-shaped, and the upper openings and the lower openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and 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; the method is characterized in that: 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 button cell pole shell and electrode lug traceless welding structure of any one of claims 7 to 9.
11. A button cell according to claim 10, wherein: the connecting structure between the negative electrode shell and the negative electrode lug adopts the button cell pole shell and electrode lug traceless welding structure according to any one of claims 7-9.
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| CN113497296A (en) * | 2020-08-04 | 2021-10-12 | 珠海冠宇电池股份有限公司 | Button cell and preparation method thereof |
| CN113708021A (en) * | 2021-08-02 | 2021-11-26 | 惠州锂威新能源科技有限公司 | Manufacturing method of multi-tab battery and multi-tab battery |
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| CN111354911B (en) | 2023-10-27 |
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