CN111354915B - Button cell electrode shell and electrode lug traceless welding method, welding structure and product - Google Patents
Button cell electrode shell and electrode lug traceless welding method, welding structure and product Download PDFInfo
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- CN111354915B CN111354915B CN202010335172.XA CN202010335172A CN111354915B CN 111354915 B CN111354915 B CN 111354915B CN 202010335172 A CN202010335172 A CN 202010335172A CN 111354915 B CN111354915 B CN 111354915B
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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
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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
- H01M6/04—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 electrode shell and electrode tab seamless welding method, a welding structure and a product, wherein the welding method of the electrode shell and the electrode tab comprises the following steps: firstly, paving a metal sheet on the inner surface of a cup-shaped polar shell, and arranging an insulating sheet between the metal sheet and the polar shell, wherein the width of the insulating sheet is smaller than that of the metal sheet; then welding the metal sheet on the inner surface of the pole shell in a parallel welding manner, and forming first welding spots between the pole shell and the metal sheet, wherein the first welding spots are positioned on the metal sheet outside the coverage area of the insulating sheet; and then welding the electrode tab on the outer surface of the metal sheet in a resistance welding mode, and forming a second welding point between the electrode tab and the metal sheet, wherein the second welding point is positioned on the metal sheet in the coverage area of the insulating sheet. The invention provides a welding structure manufactured according to the welding method and a button cell adopting the structure. The welding method, the welding structure and the button cell can keep the surface of the polar shell intact.
Description
Technical Field
The invention relates to a button cell electrode shell and electrode lug seamless welding method, a welding structure and a product.
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 electrode shell and the second electrode shell forms a battery positive electrode loop with a corresponding output conductor and a corresponding battery cell pole piece, the other electrode shell forms a battery negative electrode loop with a corresponding output conductor and a corresponding battery cell pole piece, and when the first output conductor is welded with the first electrode shell, the current of resistance welding and the laser beam of laser welding penetrate through the first electrode shell, and welding spots for connecting the first electrode shell and the first output conductor are arranged through the first electrode shell, so that the surface flatness and stability of the first electrode shell are damaged, and phenomena such as electrolyte leakage and surface bulge easily occur at the welding spot position of the first electrode shell in the use process of the battery.
Disclosure of Invention
The invention aims to provide a button cell electrode shell and electrode lug traceless welding method, which can avoid damaging the flatness and stability of the electrode shell surface and further avoid the phenomena of electrolyte leakage, surface bulge and the like caused by the welding method.
The button cell electrode shell and electrode tab traceless welding method, the electrode shell is cup-shaped, an electric core is arranged in the electrode shell, the electric core is mainly formed by overlapping 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 an electrode tab, any electrode tab is welded with a corresponding electrode shell to realize electric connection, and the welding method comprises the following steps:
s1: firstly, paving a metal sheet on the inner surface of a cup-shaped polar shell, and arranging an insulating sheet between the metal sheet and the polar shell, wherein the width of the insulating sheet is smaller than that of the metal sheet;
s2: then preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first welding electrodes, the two first welding electrodes are respectively propped against different positions on the outer surface of a metal sheet, the contact positions of the two first welding electrodes and the metal sheet are positioned on the metal sheet outside the coverage area of an insulating sheet, then electrifying the two first welding electrodes to realize the welding fixed connection of the electrode shell and the metal sheet, the welding in the step S2 is continuously carried out for more than 1 time, at least 1 pair of first welding spots are formed between the electrode shell and the metal sheet, and the welding positions of the metal sheet and the electrode shell in different steps S2 can be overlapped;
s3: and then the electrode lug is jacked on the outer surface of the metal sheet, a second resistance welding device is prepared, the second resistance welding device comprises two second welding electrodes, the electrode lug is welded on the outer surface of the metal sheet through the two second welding electrodes, a second welding spot is formed between the electrode lug and the metal sheet, and the second welding spot is positioned on the metal sheet in the coverage area of the insulating sheet.
According to the invention, the metal sheet is paved on the inner surface of the pole shell, the two first welding electrodes are respectively propped against different positions on the outer surface of the metal sheet, and the welding fixation between the metal sheet and the pole shell is realized in a parallel welding resistance welding mode, and as the annular welding current channel is formed between the two first welding electrodes, the welding current does not penetrate the pole shell, and only a welding spot molten pool and a first welding spot are formed on the inner side of the pole shell; meanwhile, by arranging the insulating sheet between the metal sheet and the electrode shell, two second welding electrodes form annular welding current on the metal sheet side of the insulating sheet, so that second welding spots are formed on the outer side of the metal sheet corresponding to the coverage area of the insulating sheet, or the welding current of second resistance welding equipment bypasses the insulating sheet and passes through the first welding spots to realize current connection between the electrode shell and the metal sheet, at the moment, resistance heat is not easy to generate and a new molten pool is not easy to form at the first welding spots, and resistance heat is generated at the connection position of the electrode lugs and the metal sheet and a new molten pool and welding spot (namely the second welding spots) are formed; therefore, the welding method can keep the appearance of the electrode shell intact, and avoid the risk of battery leakage caused by the rupture of the welding point; and at least 1 pair of first welding spots are formed between the metal sheet and the pole shell, so that the connection stability between the metal sheet and the pole shell is better, meanwhile, the number of the welding spots between the metal sheet and the pole shell is more, and in view of the fact that the internal resistance of a welding position between the pole shell and the metal sheet is generally smaller than the internal resistance of a physical contact position between the pole shell and the metal sheet, the overall contact internal resistance between the pole shell and the metal sheet is smaller, and the smaller contact internal resistance is more beneficial to discharging the battery.
Preferably, in step S3, one of the two second welding electrodes is pressed on the outer surface of the electrode shell outside the electrode shell, the other second welding electrode is pressed on the outer surface of the electrode tab in the electrode shell, the pressing position of the second welding electrode is located on the metal sheet in the coverage area of the insulating sheet, then the two second welding electrodes are electrified to realize the welding and fixing connection of the electrode tab and the metal sheet, so that the welding current between the two second welding electrodes bypasses the insulating sheet and passes through the first welding spot to realize the current connection between the electrode shell and the metal sheet, and because the resistance at the first welding spot is lower, resistance heat is not easy to generate and a new molten pool is not easy to generate, and resistance heat is generated at the connection position of the electrode tab and the metal sheet and a new molten pool and welding spot (namely, the second welding spot) are formed. Further, the second welding electrode pressed with the outer surface of the electrode shell is a columnar electrode, the electrode shell opening is upwards placed on the columnar electrode, and the columnar electrode is in surface contact with the outer surface of the electrode shell, so that the second welding electrode is pressed with the electrode shell. The second welding electrode can play a role of supporting the electrode shell, and is beneficial to the welding operation. Further, the outer contour of the columnar electrode coverage area on the metal sheet is located outside the outer contour of the insulating sheet coverage area, and the welding current path between the electrode shell and the second welding electrode (i.e., the columnar electrode) located outside the electrode shell is shortest.
Preferably, 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, in the step S3, an electrode tab is attached to the lower end face of the battery cell, the electrode tab is located in the lower end face area of the axial cavity of the battery cell, the battery cell is installed in a pole shell, a second welding electrode is inserted into the axial cavity of the battery cell from top to bottom to weld the electrode tab on the outer surface of the metal plate, and at this time, the length of the electrode tab is not required to be too long and the operation is easy.
Preferably, the step S2 is continuously performed for 1-3 times, so that 1-3 pairs of first 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 welding electrodes in the different sub-steps S2 and the metal sheet are not overlapped, so that the trouble of needle pulling caused by the fact that the molten pool is enlarged when the first welding spots in the different sub-steps S2 are overlapped and the first welding electrodes are bonded with the metal sheet is avoided.
In the specific implementation process, in step S2, the second welding electrode may be pressed against the outer surface of the electrode tab in the electrode shell, and then the metal sheet may be pressed against the inner surface of the electrode shell.
In the specific implementation process, the method can also comprise the following steps: step S3 is firstly carried out, then steps S1 and S2 are sequentially carried out, and at least 1 pair of second welding spots are formed between the electrode lugs and the metal sheets in the step S3 in a parallel welding mode. Alternatively, it is also possible to: the sequence of the step S2 is changed with that of the step S3, and at least 1 pair of second welding spots are formed between the electrode lugs and the metal sheets in the step S3 in a parallel welding manner.
The invention aims at providing a seamless welding structure of a button battery electrode shell and an electrode tab, which comprises a electrode shell and an electrode tab, wherein the electrode shell is cup-shaped, a battery core is arranged in the electrode shell, the battery core is mainly formed by overlapping 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 tab, a metal plate is fixedly arranged on the inner surface of any electrode shell through a first welding spot, an insulating plate is arranged between the metal plate and the electrode shell, the width of the insulating plate is smaller than the width of the metal plate, the number of the first welding spots is more than or equal to 1 pair, the first welding spots of different pairs can be overlapped, the two first welding spots of the same pair are arranged in a staggered manner, and all the first welding spots are positioned on the metal plate outside the coverage area of the insulating plate; the electrode tab corresponding to any electrode shell is fixedly connected with the outer surface of the metal sheet through a second welding spot, and the second welding spot is positioned on the metal sheet in the coverage area of the insulating sheet.
The first welding spots and the second welding spots in the non-trace welding structure of the button battery electrode shell and the 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 first welding spots between the electrode shell and the metal sheets is large, the connection between the electrode shell and the metal sheets is firmer, the contact internal resistance is smaller, and the improvement of the discharge efficiency of the battery is facilitated.
Preferably, all the first welding spots are uniformly distributed around the circumference by taking the center of the pole shell as the center of the circle. The metal sheet is most firmly connected with the pole shell. More preferably, the first welding spots of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is facilitated.
Preferably, the battery cell is mainly formed by winding a first pole piece, a second pole piece and a diaphragm, and an axial cavity is formed in the center of the battery cell. Further preferably, the second welding spot is located in the vertical projection area of the axial cavity of the battery cell on the metal sheet. At this time, can place in the polar shell after the electric core, through inserting the axial cavity of electric core with the second welding electrode in with electrode tab roof pressure weld on the sheetmetal, the operation is more convenient, and at this moment, the length of electrode tab also need not too long, practices thrift the cost. Further, the insulating sheet is located in the end face area of the axial cavity of the battery cell, so that after the battery cell is placed in the electrode shell, when the second welding electrode is inserted into the axial cavity of the battery cell to perform welding operation between the electrode tab and the metal sheet, the second welding point is only located in the covering area of the insulating sheet of the metal sheet.
Preferably, the insulating sheet is fixedly arranged on the pole shell side of the metal sheet, so that displacement of the insulating sheet is better avoided.
The invention further aims to provide a button cell, 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; at least one of the connection structure between the positive electrode shell and the positive electrode tab and the connection structure between the negative electrode shell and the negative electrode tab adopts the button cell tab shell and electrode tab seamless welding structure.
Preferably, when one of the connection structure between the positive electrode shell and the positive electrode tab and the connection structure between the negative electrode shell and the negative electrode tab adopts the above button cell tab and electrode tab seamless welding structure, the other connection structure is: and the electrode lugs are directly welded on the inner surfaces of the corresponding electrode shells in a parallel welding manner on the inner sides of the electrode shells, namely, the inner surfaces of the electrode shells and the electrode lugs are fixedly connected through third welding spots, the number of the third welding spots is more than or equal to 1 pair, and the two third welding spots of the same pair are arranged in a staggered manner. Compared with 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, the button cell electrode shell and the electrode lug seamless welding structure is simpler, and the production efficiency is effectively improved. Further preferably, the battery cell is mainly formed by winding a first pole piece, a second pole piece and a diaphragm, an axial cavity is formed in the center of the battery cell, and the third welding spot is located outside the coverage area of the axial cavity of the battery cell of the pole shell where the third welding spot is located, so that the welding is more convenient.
Preferably, the connection structure between the negative electrode shell and the negative electrode tab adopts the button cell electrode shell and electrode tab seamless welding structure. In the existing manufacturing process of the button battery, the negative electrode shell is used as the bottom shell, the positive electrode shell is used as the top shell, the battery core is firstly arranged in the bottom shell, and then the top shell is correspondingly covered to assemble the battery, so that the operability of the seamless welding structure of the negative electrode shell and the electrode tab of the button battery is stronger.
Drawings
Fig. 1 is a schematic diagram of a welding operation between a pole case and a metal sheet in embodiment 1, wherein the pole case, the metal sheet, and the insulating sheet are cross-sectional views;
fig. 2 is a schematic diagram of a welding operation between the electrode tab and the metal sheet in embodiment 1, wherein the electrode case, the metal sheet, and the insulating sheet are cross-sectional views;
FIG. 3 is a top view of the pole housing of example 1;
fig. 4 is a schematic cross-sectional structure of the button cell of example 1;
FIG. 5 is a top view of the pole housing of example 2;
FIG. 6 is a top view of the pole case of example 3;
fig. 7 is a schematic cross-sectional structure of a button cell of example 4;
fig. 8 is a schematic cross-sectional structure of the button cell of the present invention;
wherein reference numeral 50' in fig. 3, 5 and 6 indicates the point location of the first 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. 1-3, the electrode shell 10 is cup-shaped, a battery core 30 is installed in the electrode shell 10, the battery core 30 is mainly formed by stacking or winding a positive electrode plate 31, a negative electrode plate 32 and a diaphragm 33 in a layered manner, the positive electrode plate and the negative electrode plate (31, 32) are respectively electrically connected with one electrode tab 20, and any electrode tab 20 is welded with the corresponding electrode shell 10 to realize electrical connection, and the welding method comprises the following steps:
s1: firstly, paving a metal sheet 40 on the inner surface of a cup-shaped pole shell 10, arranging an insulating sheet 80 between the metal sheet 40 and the pole shell, wherein the width D of the insulating sheet 80 is smaller than the width D' of the metal sheet 40;
s2: then preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first welding electrodes (100, 200), the two first welding electrodes (100, 200) are respectively propped against different positions on the outer surface of the metal sheet 40, the contact positions of the two first welding electrodes (100, 200) and the metal sheet 40 are positioned on the metal sheet 40 outside the coverage area of the insulating sheet 80, then electrifying the two first welding electrodes (100, 200) to realize the welding fixed connection of the pole shell 10 and the metal sheet 40, welding in the step S2 is continuously carried out for more than 1 time, at least 1 pair of first welding spots 50 are formed between the pole shell 10 and the metal sheet 40, and the welding positions of the metal sheet 40 and the pole shell 10 in the different steps S2 can be overlapped;
s3: then, the electrode lug is propped against the outer surface of the metal sheet, a second resistance welding device is prepared, the second resistance welding device comprises two second welding electrodes (300, 400), one second welding electrode 400 is a columnar electrode, the electrode shell 10 is upwards placed on the columnar electrode 400, the columnar electrode 400 is in surface contact with the outer surface of the electrode shell 10, the outer contour line 400 'of the coverage area of the columnar electrode 400 on the metal sheet 40 is positioned outside the outer contour line 80' of the coverage area of the insulating sheet 80, the other second welding electrode 300 is propped against the outer surface of the electrode lug 20 on the inner side of the electrode shell, and the propping position of the second welding electrode 300 is positioned on the metal sheet in the coverage area of the insulating sheet 80; then, the two second welding electrodes (300, 400) are electrified, and a second welding spot 60 is formed between the electrode lug 20 and the metal sheet 40;
the welding of step S2 is performed only once, and the number of the first welding spots 50 is 1 pair.
The outer contour 400' of the coverage area of the columnar electrode 400 on the metal sheet 40 in the embodiment described refers to the outer contour of the vertical projection area of the columnar electrode 400 on the metal sheet 40; the outer contour 80' of the area covered by the insulating sheet 80 on the metal sheet 40 refers to the outer contour of the perpendicular projected area of the insulating sheet 80 on the metal sheet 40.
Referring to fig. 1-3, the welding structure manufactured by the button cell electrode case and electrode tab seamless welding method according to embodiment 1 includes a electrode case 10 and an electrode tab 20, the electrode case 10 is cup-shaped, a battery cell 30 is installed in the electrode case 10, the battery cell 30 is mainly formed by stacking or winding a positive electrode plate 31, a negative electrode plate 32 and a diaphragm 33 in layers, the positive electrode plate and the negative electrode plate (31, 32) are respectively electrically connected with one electrode tab 20, a metal sheet 40 is fixedly arranged on the inner surface of any electrode case 10 through a first welding point 50, an insulating sheet 80 is arranged between the metal sheet 40 and the electrode case 10, the width of the insulating sheet 80 is smaller than the width of the metal sheet 40, the number of the first welding points 50 is 1 pair, the first welding points 50 of different pairs can be overlapped, two first welding points 50 of the same pair are arranged in a dislocation manner, and all the first welding points 50 are located on the metal sheet 40 outside the coverage area of the insulating sheet 80; the electrode tab 20 corresponding to any one of the electrode cases 10 is fixedly connected to the outer surface of the metal sheet 40 through a second welding point 60, and the second welding point 60 is located on the metal sheet 40 within the coverage area of the insulating sheet 80.
The invention only forms a molten pool and welding spots on the inner side of the electrode shell 10, thereby keeping the appearance of the electrode shell 10 intact and avoiding the risk of battery leakage caused by welding spot rupture; and, form 1 pair of first solder joint between sheetmetal 40 and the utmost point shell 10, the connection stability between sheetmetal 40 and the utmost point shell 10 is better, simultaneously, the solder joint quantity between sheetmetal 40 and the utmost point shell 10 is many, also can reduce the contact internal resistance between sheetmetal 40 and the utmost point shell 10, does benefit to the discharge performance that promotes the battery.
In the button cell tab and electrode tab traceless welding method and welding structure of example 1, the tab 10 is the negative electrode tab 12, and the electrode tab 20 electrically connected to the tab is the negative electrode tab 22 electrically connected to the negative electrode tab 32; of course, in the case of the button cell tab and tab seamless welding method and welding structure, when the tab 10 is the positive electrode tab 11, the tab 20 electrically connected to the tab is the positive electrode tab 21 electrically connected to the positive electrode tab 31.
As shown in fig. 4, embodiment 1 further provides a button cell, which comprises a positive electrode shell 11, a negative electrode shell 12, an insulating sealing ring 70 and an electric core 30, wherein the positive electrode shell 11 and the negative electrode shell 12 are cup-shaped, and the upper opening and the lower opening of the positive electrode shell 11 and the lower opening of the negative electrode shell 12 are oppositely buckled to form a cylindrical button cell shell; 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 layering and stacking or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate 31 is electrically connected with a positive electrode tab 21, the positive electrode tab 21 is electrically connected with the positive electrode shell 11, the negative plate 32 is electrically connected with a negative electrode tab 22, and the negative electrode tab 22 is electrically connected with the negative electrode shell 12; only the connection structure between the negative electrode case 12 and the negative electrode tab 22 in the connection structure between the positive electrode case 11 and the positive electrode tab 21 adopts the button cell tab and electrode tab seamless welding structure of embodiment 1, and the specific steps are as follows:
the connection structure between the negative electrode shell 12 and the negative electrode tab 22 is as follows: the negative electrode metal sheet 42 is fixedly arranged on the inner surface of the negative electrode shell 12 through negative electrode first welding spots 52, a negative electrode insulating sheet 82 is arranged between the negative electrode metal sheet 42 and the electrode shell 12, the width of the negative electrode insulating sheet 82 is smaller than that of the negative electrode metal sheet 42, the number of the negative electrode first welding spots 52 is 1 pair, the negative electrode first welding spots 52 of different pairs can be overlapped, the two negative electrode first welding spots 52 of the same pair are arranged in a staggered manner, and all the negative electrode first welding spots 52 are positioned on the negative electrode metal sheet 42 outside the coverage area of the negative electrode insulating sheet 82; the negative electrode tab 22 is fixedly connected with the outer surface of the negative electrode metal sheet 42 through a negative electrode second welding point 62, and the negative electrode second welding point 62 is positioned on the negative electrode metal sheet 42 in the coverage area of the negative electrode insulating sheet 82;
the connection structure between the positive electrode shell 11 and the positive electrode tab 21 is as follows: inside positive electrode shell 11, through the resistance welding mode of parallel welding with positive electrode tab 21 weld on the internal surface of positive electrode shell 11, realize fixed connection through third solder joint 90 between the internal surface of positive electrode shell 11 and the positive electrode tab 21, the quantity of third solder joint 90 is 1 pair, and adjacent third solder joint 90 dislocation set.
Example 2
As shown in fig. 5, embodiment 2 provides a method for welding a button cell electrode case and an electrode tab without mark, which is different from the method for welding a button cell electrode case and an electrode tab of embodiment 1 in that: the welding of step S2 was performed 2 times, and two welding positions of the metal sheet 40 and the pole case 10 in the two steps S2 overlap each other, and the other steps are the same as those of example 1.
As shown in fig. 5, the welded structure according to the button cell can and electrode tab traceless welding method of example 2 is different from the welded structure of example 1 in that: the number of the first welding spots 50 is 2 pairs, and two second welding spots 50 are overlapped in the first welding spots 50 of different pairs, and the rest of the structure is the same as that of embodiment 1.
Example 3
As shown in fig. 6, embodiment 3 provides a method for welding a button cell electrode case and an electrode tab without mark, which is different from the method for welding a button cell electrode case and an electrode tab of embodiment 1 in that: the welding of step S2 was performed 3 times to form 3 pairs of first welding spots 50 between the metal sheet 40 and the pole case 10, and in the different steps S2, there was no overlap in the welding positions of the metal sheet 40 and the pole case 10, and the other steps were the same as in example 1.
As shown in fig. 6, the welded structure according to the button cell can and electrode tab traceless welding method of example 3 is different from the welded structure of example 1 in that: the number of the first welding spots 50 is 3 pairs, and the first welding spots 50 of different pairs are not overlapped, and the rest of the structure is the same as that of embodiment 1.
Example 4
As shown in fig. 7, example 4 provides a button cell, which is different from the button cell of example 1 in that: the button cell electrode shell and electrode tab seamless welding structure of embodiment 1 is adopted by the connection structure between the negative electrode shell 12 and the negative electrode tab 22 and the connection structure between the positive electrode shell 11 and the positive electrode tab 21, and the connection structure between the positive electrode shell 11 and the positive electrode tab 21 is as follows: the positive electrode metal sheet 41 is fixedly arranged on the inner surface of the positive electrode shell 11 through positive electrode first welding spots 51, a positive electrode insulating sheet 81 is fixedly arranged on the inner surface of the positive electrode metal sheet 41, the width of the positive electrode insulating sheet 81 is smaller than that of the positive electrode metal sheet 41, the number of the positive electrode first welding spots 51 is 1, the positive electrode first welding spots 51 of different pairs can be overlapped, the two positive electrode first welding spots 51 of the same pair are arranged in a staggered mode, and all the positive electrode first welding spots 51 are positioned on the positive electrode metal sheet 41 outside the coverage area of the positive electrode insulating sheet 81; the positive electrode tab 21 is fixedly connected with the outer surface of the positive electrode metal sheet 81 through a positive electrode second welding point 61, and the positive electrode second welding point 61 is positioned on the positive electrode metal sheet 41 in the coverage area of the positive electrode insulating sheet 81.
Of course, in step S3 of the method for welding a button cell and an electrode tab of the present invention, the two second welding electrodes (300, 400) are not limited to the embodiment, "one of the second welding electrodes 400 is pressed on the outer surface of the electrode case 10 outside the electrode case 10, and the other second welding electrode 300 is pressed on the outer surface of the electrode tab 20 inside the electrode case 10", and the welding and fixing connection between the electrode tab 20 and the metal sheet 40 may be realized by parallel welding of the two second welding electrodes (300, 400) inside the electrode case 10. Likewise, the second welding electrode 400 pressed against the outer surface of the pole case 10 is not limited to be a cylindrical electrode, and may be a needle electrode or other common electrode types. Similarly, when the second welding electrode 400 pressed against the outer surface of the pole case 10 is a cylindrical electrode, the outer contour 400' of the covering region of the cylindrical electrode 400 of the present invention is not limited to the outer contour 80' of the covering region of the insulating sheet 80, and may be located within the outer contour 80' of the covering region of the insulating sheet 80. In addition, the number of repetitions of the step S2 in the present invention is not limited to 1, 2 and 3 in the embodiment, and may be more than 3, and the number of repetitions of the step S2 may be optionally adjusted according to the need.
In the specific implementation process, in step S2, the second welding electrode (300, 400) may be pressed against the outer surface of the electrode tab 20 in the electrode case 10, and then the metal sheet 40 may be pressed against the inner surface of the electrode case 10.
Preferably, in the button cell electrode shell and electrode tab traceless welding method of the present invention, the electric core 30 is mainly formed by winding the positive electrode plate 31, the negative electrode plate 32 and the separator 33, the axial cavity 34 is formed at the center of the electric core 30, in step S3, the electrode tab 20 is attached to the lower end surface of the electric core 30, the electrode tab 20 is located in the area of the lower end surface of the axial cavity 34 of the electric core 30, the electric core 30 is then installed in the electrode shell 10, the second welding electrode is inserted into the axial cavity 34 of the electric core 30 from top to bottom to weld the electrode tab 2 on the outer surface of the metal plate 40, at this time, the length of the electrode tab 20 is not required to be too long, and the operation is easy. Of course, in step S3 of the present invention, the electrode tab 20 may be welded to the outer surface of the metal sheet 40, and then the battery cell 30 may be mounted in the electrode case 10.
The button cell electrode shell and electrode tab seamless welding structure of embodiments 1-3 can be improved as follows:
(1) As shown in fig. 2, 5 and 6, all the first welding spots 50 are uniformly distributed around the center of the pole casing 10, and at this time, the metal sheet 40 is most firmly connected with the pole casing 10. More preferably, the first welding spots 50 of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is facilitated;
(2) As shown in fig. 3, the battery cell 30 is formed by winding a first pole piece 31, a second pole piece 32 and a diaphragm 33, and an axial cavity 34 is formed in the center of the battery cell 30. It is further preferred that the second weld 60 is located within the vertical projection area of the cell axial cavity 34 on the metal plate 40, as shown in fig. 3. At this time, after the battery cell 30 is placed in the electrode shell 10, the electrode tab 20 is pressed against the metal sheet 40 for welding by inserting the second welding electrode 300 into the axial cavity 34 of the battery cell, so that the operation is more convenient, and at this time, the length of the electrode tab 20 is not required to be too long, thereby saving the cost. Of course, the second welding point 60 may also be located on the metal sheet 40 outside the vertical projection area of the core cavity 34, where the electrode tab 20 needs to be welded to the metal sheet 40 before the core 30 is assembled into the electrode case 10, and then the core 30 is turned into the electrode case 10. Further, as shown in fig. 3, the insulating sheet 80 is located at the end surface area of the axial cavity 34 of the cell, so that after the cell 30 is placed in the electrode shell 10, the second welding point 60 is only located within the coverage area of the insulating sheet 80 on the metal sheet 40 when the electrode tab 20 is pressed against the metal sheet 40 for welding by inserting the second welding electrode 300 into the axial cavity 34 of the cell. Further, as shown in fig. 4, the third welding point 90 is located outside the coverage area of the axial cavity 34 of the battery cell of the electrode shell 11, so that welding is more convenient.
The button cells of example 1 and example 4 can each be modified as follows: the connecting structure between the negative electrode shell and the negative electrode lug adopts the button cell electrode shell and electrode lug seamless welding structure. In the conventional manufacturing process of the button cell, the negative electrode shell 12 is mostly taken as a bottom shell, the positive electrode shell 11 is taken as a top shell, and the battery cell 30 is firstly arranged in the bottom shell, and then the top shell is correspondingly covered to assemble the battery, so that the operability of the seamless welding structure of the negative electrode shell 12 and the electrode tab 22 by adopting the button cell is stronger.
The button cell tab and electrode tab traceless welding method in example 1 is a preferred embodiment of the present invention, however, the button cell tab and electrode tab traceless welding method of the present invention may be performed in the sequence of "step S2-step S1-step S3" or "step S3-step S1-step S2", wherein at least 1 pair of second welding spots 62 (the welded structure is shown in fig. 8) are formed between the electrode tab 22 and the metal sheet 42 in the step S3 by means of parallel welding resistance welding in the sequence of "step S3-step S1-step S2", and others.
It should be noted that, when one of the connection structures between the positive electrode case 11 and the positive electrode tab 21 and the connection structure between the negative electrode case 12 and the negative electrode tab 22 adopts the above-mentioned button cell tab and electrode tab seamless welding structure, the other connection structure may be that the electrode tab is welded on the metal sheet first, then the metal sheet is fixed on the inner surface of the corresponding electrode case by means of parallel welding or by means of applying conductive adhesive on the inner side of the electrode case, or the electrode tab is directly fixed on the inner surface of the corresponding electrode case by means of parallel welding or by means of applying conductive adhesive. 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 (20)
1. The button battery electrode shell and electrode tab traceless welding method is characterized in that the electrode shell is cup-shaped, an electric core is arranged in the electrode shell, the electric core is mainly formed by overlapping or winding a positive plate, a negative plate and a diaphragm in a layered mode, the positive plate and the negative plate are respectively and electrically connected with one electrode tab, and any electrode tab is welded with the corresponding electrode shell to realize electric connection, and the welding method is characterized by comprising the following steps:
s1: firstly, paving a metal sheet on the inner surface of a cup-shaped polar shell, and arranging an insulating sheet between the metal sheet and the polar shell, wherein the width of the insulating sheet is smaller than that of the metal sheet;
s2: then preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first welding electrodes, the two first welding electrodes are respectively propped against different positions on the outer surface of a metal sheet, the contact positions of the two first welding electrodes and the metal sheet are positioned on the metal sheet outside the coverage area of an insulating sheet, then electrifying the two first welding electrodes to realize the welding fixed connection of the electrode shell and the metal sheet, the welding in the step S2 is continuously carried out for more than 1 time, at least 1 pair of first welding spots are formed between the electrode shell and the metal sheet, and the welding positions of the metal sheet and the electrode shell in different steps S2 can be overlapped;
s3: and then the electrode lug is jacked on the outer surface of the metal sheet, a second resistance welding device is prepared, the second resistance welding device comprises two second welding electrodes, the electrode lug is welded on the outer surface of the metal sheet through the two second welding electrodes, a second welding spot is formed between the electrode lug and the metal sheet, and the second welding spot is positioned on the metal sheet in the coverage area of the insulating sheet.
2. The button cell tab and tab traceless welding method of claim 1, wherein the method comprises the steps of: in the step S3, one of the two second welding electrodes is tightly pressed on the outer surface of the electrode shell outside the electrode shell, the other second welding electrode is propped on the outer surface of the electrode lug in the electrode shell, the propping position of the second welding electrode is positioned on the metal sheet in the coverage area of the insulating sheet, and then the two second welding electrodes are electrified to realize the welding fixed connection of the electrode lug and the metal sheet.
3. The button cell tab and tab traceless welding method according to claim 2, wherein: the second welding electrode tightly pressed with the outer surface of the electrode shell is a columnar electrode, the electrode shell opening is upwards placed on the columnar electrode, and the columnar electrode is in surface contact with the outer surface of the electrode shell, so that the second welding electrode is tightly pressed with the electrode shell.
4. The button cell casing and electrode tab traceless welding method according to claim 3, wherein: the outer contour line of the columnar electrode coverage area on the metal sheet is positioned outside the outer contour line of the insulation sheet coverage area.
5. The button cell tab and tab traceless welding method of claim 1, wherein the method comprises the steps of: 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, in the step S3, electrode lugs are attached to the lower end face of the battery cell, the electrode lugs are located in the area of the lower end face of the axial cavity of the battery cell, the battery cell is installed in a pole shell, and a second welding electrode is inserted into the axial cavity of the battery cell from top to bottom to weld the electrode lugs on the outer surface of the metal sheet.
6. The button cell tab and tab traceless welding method of claim 1, wherein the method comprises the steps of: step S2 is continuously performed for 1-3 times.
7. The button cell tab and tab traceless welding method of claim 1, wherein the method comprises the steps of: the contact positions of the two first welding electrodes and the metal sheet in the different sub-steps S2 are not overlapped.
8. The button cell tab and tab traceless welding method of claim 1, wherein the method comprises the steps of: in the step S2, the second welding electrode is firstly propped against the outer surface of the electrode lug in the electrode shell, and then the metal sheet is propped against the inner surface of the electrode shell.
9. The button cell casing and electrode tab traceless welding method according to any one of claims 1 to 8, wherein: step S3 is firstly carried out, then steps S1 and S2 are sequentially carried out, and at least 1 pair of second welding spots are formed between the electrode lugs and the metal sheets in the step S3 in a parallel welding mode.
10. The button cell casing and electrode tab traceless welding method according to any one of claims 1 to 8, wherein: the sequence of the step S2 is changed with that of the step S3, and at least 1 pair of second welding spots are formed between the electrode lugs and the metal sheets in the step S3 in a parallel welding manner.
11. The button battery electrode shell and electrode tab seamless welding structure prepared by the button battery electrode shell and electrode tab seamless welding method according to claim 1 comprises an electrode shell and an electrode tab, wherein the electrode shell is cup-shaped, an electric core is arranged in the electrode shell and is mainly formed by overlapping or winding a positive plate, a negative plate and a diaphragm in a layered manner, and the positive plate and the negative plate are respectively and electrically connected with one electrode tab; the electrode tab corresponding to any electrode shell is fixedly connected with the outer surface of the metal sheet through a second welding spot, and the second welding spot is positioned on the metal sheet in the coverage area of the insulating sheet.
12. The button cell pole case and electrode tab traceless welding structure according to claim 11, wherein: all the first welding spots are uniformly distributed around the circumference by taking the center of the pole shell as the center of the circle.
13. The button cell pole case and electrode tab traceless welding structure according to claim 12, wherein: the first pads of each pair are symmetrically distributed.
14. The button cell pole case and electrode tab traceless welding structure according to claim 11, wherein: the battery cell is mainly formed by winding a first pole piece, a second pole piece and a diaphragm, and an axial cavity is formed in the center of the battery cell.
15. The button cell pole case and electrode tab traceless welding structure according to claim 14, wherein: and the second welding spot is positioned in the vertical projection area of the axial cavity of the battery cell on the metal sheet.
16. The button cell pole case and electrode tab traceless welding structure according to claim 15, wherein: the insulating sheet is positioned in the end surface area of the axial cavity of the electric motor.
17. The button cell pole case and electrode tab traceless welding structure according to claim 11, wherein: the insulating sheet is fixedly arranged on the pole shell side of the metal sheet.
18. A button cell 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: at least one of the connection structure between the positive electrode shell and the positive electrode tab and the connection structure between the negative electrode shell and the negative electrode tab adopts the button cell tab and electrode tab seamless welding structure as claimed in any one of claims 11 to 17.
19. The button cell of claim 18, wherein when one of the connection structure between the positive electrode case and the positive electrode tab and the connection structure between the negative electrode case and the negative electrode tab adopts the seamless welding structure between the positive electrode case and the electrode tab of any one of claims 11 to 17, the other connection structure is: and the electrode lugs are directly welded on the inner surfaces of the corresponding electrode shells in a parallel welding manner on the inner sides of the electrode shells, namely, the inner surfaces of the electrode shells and the electrode lugs are fixedly connected through third welding spots, the number of the third welding spots is more than or equal to 1 pair, and the two third welding spots of the same pair are arranged in a staggered manner.
20. The button cell as defined in claim 19, wherein: the battery cell is mainly formed by winding a first pole piece, a second pole piece and a diaphragm, an axial cavity is formed in the center of the battery cell, and the third welding spot is located outside the coverage area of the axial cavity of the battery cell of the pole shell where the third welding spot is located.
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