CN111354910A - 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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- CN111354910A CN111354910A CN202010334035.4A CN202010334035A CN111354910A CN 111354910 A CN111354910 A CN 111354910A CN 202010334035 A CN202010334035 A CN 202010334035A CN 111354910 A CN111354910 A CN 111354910A
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- 238000003466 welding Methods 0.000 title claims abstract description 301
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000002184 metal Substances 0.000 claims abstract description 200
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 31
- 238000004804 winding Methods 0.000 claims description 15
- 238000005452 bending Methods 0.000 claims description 8
- 238000010030 laminating Methods 0.000 claims description 6
- 239000004020 conductor Substances 0.000 description 16
- 238000009413 insulation Methods 0.000 description 7
- 229910000679 solder Inorganic materials 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 1
- 238000004519 manufacturing process 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/216—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for button or coin cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
- H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides 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, arranging a metal sleeve cup capable of containing a battery cell on the inner surface of a cup-shaped pole shell, pressing the bottom of the metal sleeve cup against the inner surface of the pole shell, arranging an insulating sheet between the bottom of the metal sleeve cup and the pole shell, wherein the width of the insulating sheet is smaller than that of the bottom of the metal sleeve cup; then welding the metal sleeve cup on the inner surface of the pole shell in a parallel welding resistance welding mode, forming at least 1 pair of first welding points between the pole shell and the metal sleeve cup, wherein the first welding points are all positioned on the cup bottom of the metal sleeve cup outside the coverage area of the insulating sheet; and then, welding an electrode lug on the inner surface of the bottom of the metal sleeve cup through resistance welding equipment, forming a second welding point between the electrode lug and the metal sleeve cup, wherein the second welding point is positioned on the bottom of the metal sleeve cup in the coverage area of the insulating sheet. The welding structure is manufactured by the method and is applied to button batteries.
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 them polar shell and the output conductor that corresponds and the battery negative pole return circuit that the electric core pole piece that corresponds in first polar shell and the second polar shell constitutes the battery of battery, another polar shell and the output conductor that corresponds and the battery negative pole return circuit that the electric core pole piece that corresponds constitutes the battery, because first output conductor when welding with first polar shell, the electric current of resistance welding and the laser beam of laser welding all can pierce through first polar shell, the solder joint of connecting first polar shell and first output conductor is run through first polar shell setting, the surface smoothness and the stability of first polar shell have been destroyed, in the battery use, electrolyte's weeping and surface swell phenomenons appear easily in the solder joint position of first polar shell.
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 traceless 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 stacking or winding a positive plate, a negative plate and a diaphragm layer, 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: firstly, arranging a metal sleeve cup capable of containing a battery cell on the inner surface of a cup-shaped pole shell, pressing the bottom of the metal sleeve cup against the inner surface of the pole shell, arranging an insulating sheet between the bottom of the metal sleeve cup and the pole shell, wherein the width of the insulating sheet is smaller than that of the bottom of the metal sleeve cup;
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 pressed on different positions on the inner surface of the bottom of the metal cup, the contact positions of the two first welding electrodes and the metal cup are both positioned on the bottom of the metal cup outside the coverage area of the insulating sheet, then the two first welding electrodes are electrified to realize the welding and fixing connection of the polar shell and the metal cup, the welding of the step S2 is continuously carried out for more than 1 time, at least 1 pair of first welding points are formed between the polar shell and the metal cup, and the welding positions of the metal cup and the polar shell can be overlapped in different steps S2;
s3: and then pressing the electrode lug on the inner surface of the bottom of the metal sleeve cup in a jacking manner to prepare second resistance welding equipment, wherein the second resistance welding equipment comprises two second welding electrodes, the electrode lug is welded on the inner surface of the bottom of the metal sleeve cup through the two second welding electrodes, a second welding spot is formed between the electrode lug and the metal sleeve cup, and the second welding spot is positioned on the bottom of the metal sleeve cup in the coverage area of the insulating sheet.
The metal sleeve cup capable of containing the battery cell is arranged on the inner surface of the electrode shell, the cup bottom of the metal sleeve cup is pressed against the inner surface of the electrode shell, the two first welding electrodes are respectively pressed against different positions on the inner surface of the cup bottom of the metal sleeve cup, and the metal sleeve cup and the electrode shell are welded and fixed in a parallel welding resistance welding mode; meanwhile, an insulating sheet is arranged between the bottom of the metal sleeve cup and the electrode shell, so that two second welding electrodes form annular welding current on the metal sleeve cup side of the insulating sheet, and a second welding spot is formed on the metal sleeve cup side of the insulating sheet, or the welding current of second resistance welding equipment bypasses the insulating sheet and penetrates through the first welding spot to realize current connection between the electrode shell and the metal sleeve cup, and at the moment, because the resistance at the first welding spot is lower, resistance heat is not easy to generate and a new molten pool is formed, and resistance heat can be generated at the connecting position of an electrode lug and the metal sleeve cup and a new molten pool and a welding spot (namely, the second welding spot) are formed; therefore, the welding method can keep the appearance of the pole shell complete, and avoid the risk of battery leakage caused by the fracture of the welding point; at least 1 pair of first welding points are formed between the metal sleeve cup and the pole shell, the connection stability between the metal sleeve cup and the pole shell is better, and meanwhile, the number of the welding points between the metal sleeve cup and the pole shell is large, so that the integral contact internal resistance between the pole shell and the metal sleeve cup is smaller and the battery discharge is more beneficial due to the fact that the internal resistance of the welding position between the pole shell and the metal sleeve cup is generally smaller than the internal resistance of the physical contact position between the pole shell and the metal sleeve cup; meanwhile, the metal sleeve cup can play a role in increasing current collection and fixing the battery cell.
Preferably, in step S3, one of the two second welding electrodes presses against the outer surface of the electrode shell outside the electrode shell, the other second welding electrode presses against the outer surface of the electrode tab inside the metal cup, the top pressure position of the second welding electrode is positioned on the bottom of the metal cup-covered cup in the coverage area of the insulating sheet, then electrifying the two second welding electrodes to realize the welding and fixing connection of the electrode lugs and the metal sleeve cup, the operation mode is that the welding current between the two second welding electrodes bypasses the insulation sheet and passes through the first welding point to realize the current connection between the pole shell and the metal sleeve cup, because the resistance at the first welding point is low, resistance heat is not easy to generate and a new molten pool is not easy to form, and the resistance heat can be generated at the connecting position of the electrode lug and the metal sleeve cup and a new molten pool and a welding point (namely a second welding point) are formed. Furthermore, a second welding electrode tightly pressed with the outer surface of the pole shell is a columnar electrode, an opening of the pole shell is upwards placed on the columnar electrode, and the columnar electrode is in surface contact with the outer surface of the pole shell, so that the second welding electrode is tightly pressed with the pole shell. The second welding electrode can play a role in supporting the polar shell, and is beneficial to the welding operation. Furthermore, the outer contour of the cylindrical electrode covering area on the metal sleeve cup is located outside the outer contour of the insulating sheet covering area, and the welding current path between the electrode shell and the second welding electrode (i.e. the cylindrical 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, the electrode tabs are firstly attached to the lower end face of the battery cell and located in the lower end face area of the axial cavity of the battery cell, the battery cell is then placed into the metal sleeve cup in the battery case, the second welding electrode is inserted into the axial cavity of the battery cell from top to bottom to weld the electrode tabs on the inner surface of the bottom of the metal sleeve cup, and at the moment, the length of the electrode tabs does not need to be too long and the operation is easy.
Preferably, step S2 is performed continuously for 1-3 times, so as to form 1-3 pairs of first welding points between the metal cup and the electrode shell, thereby reducing the operation cost and improving the working efficiency as much as possible while ensuring that the metal cup and the electrode shell are reliably welded together.
Preferably, the contact positions of the two first welding electrodes and the metal sleeve cup in the different steps S2 are not overlapped, so as to avoid that the molten pool is enlarged when the first welding points in the different steps S2 are overlapped, which causes the first welding electrodes and the metal sleeve cup to be bonded together and brings about the trouble of needle poking.
In the specific implementation process, the second welding electrode can be pressed on the outer surface of the electrode lug on the inner side of the metal sleeve cup, and then the cup bottom of the metal sleeve cup is pressed on the inner surface of the pole shell.
In the specific implementation process, the following steps are also included: step S3 is performed first, and then steps S1 and S2 are performed in sequence, and at least 1 pair of second welding points are formed between the electrode tab and the metal cup through resistance welding of parallel welding in step S3. Alternatively, it is also possible: the sequence of the step S2 is changed from that of the step S3, and at least 1 pair of second welding points are formed between the electrode tab and the metal sleeve cup in the step S3 by resistance welding of parallel welding.
The invention also aims to provide a button cell pole shell and electrode tab seamless welding structure, which comprises a pole shell and an electrode tab, the electrode shell is cup-shaped, an electric core is arranged in the electrode shell, the electric core 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 an electrode lug, a metal sleeve cup is fixedly arranged on the inner surface of any one electrode shell through a first welding spot, the bottom of the metal sleeve cup is pressed against the inner surface of the pole shell, the electric core is sleeved in the metal sleeve cup, an insulating sheet is arranged between the bottom of the metal cup and the polar shell, the width of the insulating sheet is smaller than that of the metal cup, 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 bottom of the metal cup outside the coverage area of the insulating sheet; and an electrode tab corresponding to any one of the electrode shells is fixedly connected with the inner surface of the bottom of the metal sleeve cup through a second welding point, and the second welding point is positioned on the bottom of the metal sleeve cup in the coverage area of the insulating sheet.
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 first welding points between the pole shell and the metal sleeve cup is large, the connection between the pole shell and the metal sleeve cup is firmer, the contact internal resistance is smaller, and the discharge efficiency of the battery is favorably improved.
Preferably, all the first welding points are uniformly distributed around the circumference by taking the center of the polar shell as a circle center. The connection between the metal sleeve cup and the pole shell is the most firm. More preferably, the first welding points of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is more 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 point is located in a vertical projection area of the axial cavity of the battery cell on the bottom of the metal cup. At the moment, after the battery core is placed in the metal sleeve ring in the electrode shell, the second welding electrode is inserted into the axial cavity of the battery core to press the electrode lug to the top of the metal sleeve cup bottom for welding, the operation is more convenient, at the moment, the length of the electrode lug does not need to be too long, and the cost is saved. Furthermore, the insulating sheet is located in the end surface area of the axial cavity of the battery cell, so that after the battery cell is placed in the metal sleeve ring in the electrode shell, when a second welding electrode is inserted into the axial cavity of the battery cell to perform welding operation between the electrode lug and the metal sleeve cup, the second welding spot is only located in the insulating sheet covering area of the bottom of the metal sleeve cup.
Preferably, the insulating sheet is fixed to be set up in the outside of metal set cup bottom of cup, better avoid the insulating sheet to shift.
Preferably, the cross-sectional shape of the cup wall of the positive electrode metal sleeve cup is ┐ "
And (4) shape.
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 adopts the button battery electrode shell and electrode lug traceless 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 button cell electrode shell and electrode tab traceless welding structure, the other connection structure is as follows: and directly welding electrode lugs on the inner surface of the corresponding pole shell in a resistance welding mode of parallel welding on the inner side of the pole shell, namely fixedly connecting the inner surface of the pole shell and the electrode lugs through third welding spots, wherein the number of the third welding spots is more than or equal to 1 pair, and two third welding spots of the same pair are arranged in a staggered mode. Compared with the connecting structure between the positive electrode shell and the positive electrode lug and the connecting structure between the negative electrode shell and the negative electrode lug which adopt the button battery electrode shell and electrode lug traceless welding structure, the button battery electrode shell and electrode lug traceless welding structure is simpler, and the production efficiency is effectively improved.
Preferably, the connecting structure between the positive electrode shell and the positive electrode lug adopts the seamless welding structure of the button battery electrode shell and the electrode lug. Preferably, the positive and negative electrode shells are partially overlapped in the vertical direction, the opening end wall of the negative electrode shell is positioned on the inner side of the opening end wall of the positive electrode shell, a gap is reserved between the opening end wall of the negative electrode shell and the opening end wall of the positive electrode shell, the insulating sealing ring is clamped in the gap, the lower end of the insulating sealing ring extends inwards to form a bending part, the opening end wall of the negative electrode shell is wrapped in the bending part, and an annular cavity is formed among the positive electrode shell, the battery core and the bending part of the insulating sealing ring; the cup wall of the metal sleeve cup is embedded in the annular cavity, and the upper end of the cup wall of the metal sleeve cup is abutted to the bottom of the bending part of the insulating sealing ring. Generally, after the positive casing, the negative casing and the insulating sealing ring of the button cell are assembled, a final sealing process is performed by pressing the open end wall of the positive casing inwards. In the sealing procedure, the opening end wall of the positive electrode shell transmits downward pressing force to the cup wall of the positive metal sleeve cup in the inward bending process, so that the physical contact between the cup bottom of the metal sleeve cup and the positive electrode shell is tighter, and the electrical contact stability is improved.
Drawings
Fig. 1 is a schematic view of a welding operation between a pole shell and a metal sleeve in example 1, wherein the pole shell, the metal sleeve and an insulating sheet are in cross-sectional views;
FIG. 2 is a schematic view showing a welding operation between an electrode tab and a metal cup in example 1, in which a pole shell, the metal cup and an insulating sheet are cross-sectional views;
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 reference numeral 50' in fig. 3, 5, 6 indicates the point of the first welding point.
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, wherein 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 laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate and the negative plate (31, 32) are respectively electrically connected with an electrode tab 20, and any electrode tab 20 is welded with the corresponding pole shell 10 to realize electrical connection, and the welding method comprises the following steps:
s1: firstly, arranging a metal sleeve cup 40 capable of containing the battery cell 30 on the inner surface of a cup-shaped pole shell 10, wherein the cup bottom 40a of the metal sleeve cup 40 is pressed against the inner surface of the pole shell 10, an insulating sheet 80 is arranged between the cup bottom 40a of the metal sleeve cup and the pole shell, and the width D of the insulating sheet 80 is smaller than the width D' of the cup bottom 40a of the metal sleeve cup;
s2: then preparing a first resistance welding device, wherein the first resistance welding device comprises two first welding electrodes (100 and 200), the two first welding electrodes (100 and 200) are respectively pressed on different positions on the inner surface of the bottom 40a of the metal sleeve cup, the contact positions of the two first welding electrodes (100 and 200) and the metal sleeve cup 40 are both positioned on the bottom 40a of the metal sleeve cup outside the coverage area of the insulating sheet 80, then the two first welding electrodes (100 and 200) are electrified to realize the welding fixed connection of the pole shell 10 and the metal sleeve cup 40, the welding of the step S2 is continuously carried out for more than 1 time, at least 1 pair of first welding points 50 are formed between the pole shell 10 and the metal sleeve cup 40, and the welding positions of the metal sleeve cup 40 and the pole shell 10 in the step S2 in different times can be overlapped;
s3: then pressing the electrode tab 20 against the inner surface of the bottom 40a of the metal sleeve cup to prepare a second resistance welding device, wherein the second resistance welding device comprises two second welding electrodes (300, 400), one second welding electrode 400 is a cylindrical electrode, the opening of the electrode shell 10 is upwards placed on the cylindrical electrode 400, the cylindrical electrode 400 is in surface contact with the outer surface of the electrode shell 10, the outer contour line 400 'of the area covered by the cylindrical electrode 400 on the bottom 40a of the metal sleeve cup is positioned outside the outer contour line 80' of the area covered by the insulating sheet 80, the other second welding electrode 300 is pressed against the outer surface of the electrode tab 20 on the inner side of the metal sleeve cup 40, and the pressing position of the second welding electrode 300 is positioned on the bottom 40a of the metal sleeve cup in the area covered by the insulating sheet 80; then electrifying the two second welding electrodes (300, 400) to form a second welding point 60 between the electrode lug 20 and the metal sleeve cup 40;
the welding of step S2 is performed only once, and the number of first welding points 50 is 1 pair.
The outer contour line 400' of the coverage area of the columnar electrode 400 on the metal sleeve cup bottom 40a in the embodiment refers to the outer contour line of the vertical projection area of the columnar electrode 400 on the metal sleeve cup bottom 40 a; the outer contour line 80' of the area covered by the insulating sheet 80 on the metal sleeve cup bottom 40a refers to the outer contour line of the vertical projection area of the insulating sheet 80 on the metal sleeve cup bottom 40 a.
With reference to fig. 1 to 3, a welded structure manufactured by a button battery pole case and electrode tab seamless welding method according to embodiment 1 includes a pole case 10 and an electrode tab 20, the pole case 10 is cup-shaped, an electrical core 30 is installed in the pole case 10, the electrical core 30 is mainly formed by stacking or winding a positive plate 31, a negative plate 32 and a diaphragm 33 in a layer shape, the positive and negative plates (31, 32) are respectively electrically connected to an electrode tab 20, a metal cup 40 is fixedly disposed on an inner surface of any one of the pole cases 10 through a first welding point 50, a cup bottom 40a of the metal cup is pressed against the inner surface of the pole case 10, the electrical core 30 is sleeved in the metal cup 40, an insulating sheet 80 is disposed between the cup bottom 40a of the metal cup and the pole case 10, the insulating sheet 80 has a width smaller than that of the cup bottom 40a of the metal cup, the number of the first welding points 50 is 1 pair, and different pairs of the first welding points 50 can be overlapped, the two first welding spots 50 of the same pair are arranged in a staggered manner, and all the first welding spots 50 are positioned on the cup bottom 40a of the metal cup set outside the coverage area of the insulating sheet 80; the electrode tab 20 corresponding to any one of the electrode shells 10 is fixedly connected with the inner surface of the metal sleeve cup bottom 40a through a second welding point 60, and the second welding point 60 is located on the metal sleeve cup bottom 40a in the coverage area of the insulating sheet 80.
According to the invention, only the molten pool and the welding spot are formed on the inner side of the pole shell 10, so that the appearance of the pole shell 10 is kept complete, and the risk of battery leakage caused by welding spot fracture is avoided; and, 1 pair of first welding spot is formed between metal retainer cup 40 and the utmost point shell 10, and the connection stability between metal retainer cup 40 and the utmost point shell 10 is better, and simultaneously, the welding spot quantity is many between metal retainer cup 40 and the utmost point shell 10, also can reduce the contact internal resistance between metal retainer cup 40 and the utmost point shell 10, does benefit to the discharge performance who promotes the battery.
In the button cell pole shell and electrode tab seamless welding method and welding structure of embodiment 1, the pole shell 10 is a positive pole shell 11, and the electrode tab 20 electrically connected with the pole shell correspondingly is a positive pole tab 21 electrically connected with a positive pole piece 31; of course, if the button cell electrode shell and the electrode tab are welded in a seamless manner and in a seamless manner, when the electrode shell 10 is the negative electrode shell 12, the electrode tab 20 electrically connected with the electrode shell correspondingly is the negative electrode tab 22 electrically connected with the negative electrode sheet 32.
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 laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate 31 is electrically connected with a positive pole tab 21, the positive pole tab 21 is electrically connected with the positive shell 11, the negative plate 32 is electrically connected with a negative pole tab 22, and the negative pole tab 22 is electrically connected with the negative shell 12; in 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, only the connection structure between the positive electrode shell 11 and the positive electrode tab 21 adopts the button battery electrode shell and electrode tab seamless welding structure of embodiment 1, which is specifically as follows:
the connection structure between the positive electrode shell 11 and the positive electrode tab 21 is as follows: an anode metal sleeve cup 41 is fixedly arranged on the inner surface of the anode shell 11 through an anode first welding point 51, the anode metal sleeve cup 41 is provided with a cup bottom 41a and a cup wall 41b, the cup bottom 41a of the anode metal sleeve cup is pressed against the inner surface of the anode shell 11, an anode insulating sheet 81 is arranged between the cup bottom 41a of the anode metal sleeve cup and the anode shell 11, the width of the anode insulating sheet 81 is smaller than that of the cup bottom 41a of the anode metal sleeve cup, the number of the anode first welding points 51 is 1 pair, different pairs of anode first welding points 51 can be overlapped, two anode first welding points 51 of the same pair are arranged in a staggered mode, and all the anode first welding points 51 are positioned on the anode metal sleeve cup bottom 41a outside the coverage area of the anode insulating sheet 81; the anode tab 21 is fixedly connected with the outer surface of the anode metal sleeve cup 41 through an anode second welding point 61, and the anode second welding point 61 is positioned on the bottom 41a of the cathode metal sleeve cup in the coverage area of the anode insulating sheet 81;
the connection structure between the negative electrode shell 12 and the negative electrode tab 22 is as follows: and welding the negative electrode tab 22 on the inner surface of the negative electrode shell 12 in the manner of resistance welding by parallel welding on the inner side of the negative electrode shell 12, namely, fixedly connecting the inner surface of the negative electrode shell 12 and the negative electrode tab 22 through a third welding point 300, wherein the number of the third welding points 300 is 1 pair, and the adjacent third welding points 300 are arranged in a staggered manner.
Example 2
As shown in fig. 5, embodiment 2 provides a seamless welding method for a button cell pole shell and an electrode tab, which is different from the seamless welding method for the button cell pole shell and the electrode tab of embodiment 1 in that: the welding of step S2 was performed 2 times, and two welding positions of the metal cup 40 and the pole shell 10 of step S2 were overlapped, and the rest of the steps were the same as those of embodiment 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 first pads 50 is 2 pairs, and two of the first pads 50 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, embodiment 3 provides a seamless welding method for a button cell pole shell and an electrode tab, which is different from the seamless welding method for the button cell pole shell and the electrode tab of embodiment 1 in that: the welding of step S2 is performed 3 times to form 3 pairs of first welding points 50 between the metal cup 40 and the pole shell 10, and there is no overlap between the welding positions of the metal cup 40 and the pole shell 10 in step S2, and the rest steps are the same as those of 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 first welding points 50 is 3 pairs, and the first welding points 50 of different pairs are not overlapped, and the rest of the structure is the same as that of the embodiment 1.
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 negative pole shell 12 and negative pole utmost point ear 22 and the connection structure between positive pole shell 11 and the positive pole utmost point ear 21 all adopt the button cell utmost point shell of embodiment 1 and the no trace welded structure of electrode utmost point ear, the connection structure between negative pole shell 12 and the negative pole utmost point ear 22 is:
a negative electrode metal sleeve 42 is fixedly arranged on the inner surface of the negative electrode shell 12 through a negative electrode first welding point 52, the negative electrode metal sleeve 42 is provided with a cup bottom 42a and a cup wall 42b, the cup bottom 42a of the negative electrode metal sleeve is pressed against the inner surface of the negative electrode shell 12, a negative electrode insulation sheet 82 is arranged between the cup bottom 42a of the negative electrode metal sleeve and the negative electrode shell 12, the width of the negative electrode insulation sheet 82 is smaller than that of the cup bottom 42a of the negative electrode metal sleeve, the number of the negative electrode first welding points 52 is 1, different pairs of negative electrode first welding points 52 can be overlapped, two negative electrode first welding points 52 of the same pair are arranged in a staggered mode, and all the negative electrode first welding points 52 are positioned on the cup bottom 42a of the negative electrode metal sleeve outside the coverage area of the negative electrode insulation sheet 82; the cathode tab 22 is fixedly connected to the inner surface of the cathode metal cup 42 via a cathode second welding point 62, and the cathode second welding point 62 is located on the cathode metal cup bottom 42a in the coverage area of the cathode insulation sheet 82.
Generally, the electrode tab 20 is a metal foil that can be bent at will.
Of course, in step S3 of the button cell and electrode tab seamless welding method according to the present invention, the two second welding electrodes (300, 400) are not limited to "one second welding electrode 400 is pressed against the outer surface of the electrode shell 10 outside the electrode shell 10, and the other second welding electrode 300 is pressed against the outer surface of the electrode tab 20 inside the metal cup 40" in the embodiment, but the two second welding electrodes (300, 400) may also be resistance-welded in parallel inside the electrode shell 10 to fixedly weld the electrode tab 20 and the metal cup 40. Similarly, the second welding electrode 400 of the present invention, which is pressed against the outer surface of the pole case 10, is not limited to a cylindrical electrode, and may be a needle electrode or other common electrode types. Similarly, when the second welding electrode 400 of the present invention is a cylindrical electrode, the outer contour line 400 ' of the coverage area of the cylindrical electrode 400 of the present invention is not limited to be located outside the outer contour line 80 ' of the coverage area of the insulating sheet 80, and may be located inside the outer contour line 80 ' of the coverage area of the insulating sheet 80. In addition, the number of times of repeating 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 times of repeating the step S2 may be optionally adjusted as needed.
In the specific implementation process, the second welding electrode (300, 400) can be pressed against the outer surface of the electrode tab 20 on the inner side of the metal sleeve 40, and then the bottom 40a of the metal sleeve is pressed against the inner surface of the electrode shell 10.
Preferably, as shown in fig. 2, in the button battery pole case and electrode tab traceless welding method of the present invention, the battery cell 30 is mainly formed by winding a positive plate 31, a negative plate 32, and a separator 33, an axial cavity 34 is formed in the center of the battery cell 30, in step S3, the electrode tab 20 is first attached to the lower end surface of the battery cell 30, the electrode tab 20 is located in the lower end surface area of the axial cavity 34 of the battery cell 30, the battery cell 30 is then placed in the metal cup 40 in the pole case 10, a second welding electrode is inserted into the axial cavity 34 of the battery cell 30 from top to bottom to weld the electrode tab 2 to the inner surface of the metal cup 40, and at this time, the length of the electrode tab 20 does not need 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 inner surface of the metal cup 40, and then the battery cell 30 may be installed in the metal cup 40 in the electrode casing 10.
The button cell pole shell and electrode tab traceless welding structure of embodiments 1-3 can be improved as follows:
(1) as shown in fig. 2, 5 and 6, all the first welding points 50 are uniformly distributed around the center of the pole shell 10, and at this time, the connection between the metal cup 40 and the pole shell 10 is the most secure. More preferably, the first welding points 50 of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is more 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. Further preferably, as shown in fig. 3, the second welding point 60 is located in a vertical projection area of the cell axial cavity 34 on the metal cup 40. At this time, after the battery cell 30 is placed in the metal cup 40 in the electrode shell 10, the second welding electrode 300 is inserted into the axial cavity 34 of the battery cell to press the electrode tab 20 against the metal cup 40 for welding, so that the operation is more convenient, and at this time, the length of the electrode tab 20 does not need to be too long, thereby saving the cost. Of course, the second welding point 60 may also be located on the metal cup 40 outside the vertical projection area of the cell axial cavity 34, and at this time, it is necessary to weld the electrode tab 20 on the metal cup 40 before the cell 30 is installed in the electrode shell 10, and then turn the cell 30 into the metal cup 40 in the electrode shell 10. Further, as shown in fig. 3, the insulation sheet 80 is located in the end surface area of the axial cavity 34 of the battery cell, so as to ensure that when the second welding electrode 300 is inserted into the axial cavity 34 of the battery cell to press the electrode tab 20 against the metal cup 40 for welding after the battery cell 30 is placed in the metal cup 40 in the electrode casing 10, the second welding point 60 is only located in the coverage area of the insulation sheet 80 on the metal cup 40;
(3) the insulating sheet 80 is fixedly arranged on the outer side of the cup bottom 40a of the metal sleeve cup, so that the insulating sheet is better prevented from shifting;
(4) as shown in fig. 4 and 7, the cross-sectional shape of the wall 40b of the metal sleeve 40 is "┐" or "
Of course, the sectional shape of the wall 40b of the positive electrode metal cup 40 is not limited to the shape of "┐" or "
The shape of the Chinese character 'ji' can also be other common shapes such as T-shaped or special-shaped shapes.
The button cells of example 1 and example 4 were modified as follows: as shown in fig. 4 and 7, the connection structure between the positive electrode shell 11 and the positive electrode tab 21 adopts the seamless welding structure between the button battery electrode shell and the electrode tab. More preferably, as shown in fig. 4 and 7, the positive and negative electrode cases (11, 12) are partially overlapped in the vertical direction, the opening end wall of the negative electrode case 12 is located inside the opening end wall of the positive electrode case 11, a gap is left between the opening end wall of the negative electrode case 12 and the opening end wall of the positive electrode case 11, the insulating sealing ring 70 is clamped in the gap, the lower end of the insulating sealing ring 70 extends inward to form a bent portion 71, the bent portion 71 wraps the opening end wall of the negative electrode case 12, and an annular cavity 500 is formed among the positive electrode case 11, the battery cell 30, and the bent portion 71 of the insulating sealing ring; the cup wall 41b of the positive metal sleeve 41 is embedded in the annular cavity 500, and the upper end of the cup wall 41b of the positive metal sleeve 41 is abutted against the bottom of the bending part 71 of the insulating sealing ring. Generally, after the positive electrode can 11, the negative electrode can 12, and the insulating sealing ring 70 of the button cell are assembled, a final sealing process is performed by pressing the open end wall of the positive electrode can 11 inward. In the sealing process, a downward pressing force is transmitted to the cup wall 41b of the positive metal sleeve 41 in the process of bending the opening end wall of the positive shell 11 inwards, so that the physical contact between the cup bottom 41a of the metal sleeve 41 and the positive shell 11 is tighter, and the electrical contact stability is improved.
The coin cell electrode case and electrode tab seamless welding method in example 1 is a preferred embodiment of the present invention, however, the coin cell electrode case and electrode tab seamless welding method of the present invention can be performed in the sequence of "step S2-step S1-step S3" or "step S3-step S1-step S2" and others, wherein when the sequence of "step S3-step S1-step S2" is performed, and at least 1 pair of second welding points 62 "are formed between the electrode tab 22 and the metal cup 42 by resistance welding in parallel welding in step S3 (the resulting welded structure is shown in fig. 8), among others.
It should be noted that, when 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 be any one of the existing connection methods that can achieve the electrical connection between the electrode tab and the corresponding electrode shell, such as welding the electrode tab on the metal sleeve cup first, and then fixing the metal sleeve cup on the inner side of the electrode shell by a parallel welding resistance welding method or a conductive adhesive coating method, or directly fixing the electrode tab on the inner surface of the corresponding electrode shell by a parallel welding resistance welding method or a conductive adhesive coating method. In addition, the first solder joint 50 of the present invention is not limited to 1 solder joint in the drawings, and may be 2 or more than 2 solder joints. 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 (22)
1. A button battery pole shell and electrode lug seamless welding method is characterized in that the welding method comprises the following steps:
s1: firstly, arranging a metal sleeve cup capable of containing a battery cell on the inner surface of a cup-shaped pole shell, pressing the bottom of the metal sleeve cup against the inner surface of the pole shell, arranging an insulating sheet between the bottom of the metal sleeve cup and the pole shell, wherein the width of the insulating sheet is smaller than that of the bottom of the metal sleeve cup;
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 pressed on different positions on the inner surface of the bottom of the metal cup, the contact positions of the two first welding electrodes and the metal cup are both positioned on the bottom of the metal cup outside the coverage area of the insulating sheet, then the two first welding electrodes are electrified to realize the welding and fixing connection of the polar shell and the metal cup, the welding of the step S2 is continuously carried out for more than 1 time, at least 1 pair of first welding points are formed between the polar shell and the metal cup, and the welding positions of the metal cup and the polar shell can be overlapped in different steps S2;
s3: and then pressing the electrode lug on the inner surface of the bottom of the metal sleeve cup in a jacking manner to prepare second resistance welding equipment, wherein the second resistance welding equipment comprises two second welding electrodes, the electrode lug is welded on the inner surface of the bottom of the metal sleeve cup through the two second welding electrodes, a second welding spot is formed between the electrode lug and the metal sleeve cup, and the second welding spot is positioned on the bottom of the metal sleeve cup in the coverage area of the insulating sheet.
2. The button cell pole shell and electrode tab seamless welding method according to claim 1, characterized in that: in step S3, one of the two second welding electrodes is pressed against the outer surface of the electrode shell outside the electrode shell, the other second welding electrode is pressed against the outer surface of the electrode tab inside the metal sleeve, the pressing position of the second welding electrode is located on the bottom of the metal sleeve in the coverage area of the insulating sheet, and then the two second welding electrodes are energized to realize the welding and fixing connection of the electrode tab and the metal sleeve.
3. The button cell pole shell and electrode tab seamless welding method according to claim 2, characterized in that: the second welding electrode tightly pressed with the outer surface of the polar shell is a cylindrical electrode, the opening of the polar shell is upwards placed on the cylindrical electrode, and the cylindrical electrode is in surface contact with the outer surface of the polar shell, so that the second welding electrode is tightly pressed with the polar shell.
4. The button cell pole shell and electrode tab seamless welding method according to claim 3, characterized in that: the outer contour line of the cylindrical electrode covering area on the metal sleeve cup is positioned outside the outer contour line of the insulating sheet covering area.
5. The button cell pole shell and electrode tab seamless welding method according to claim 1, characterized in that: 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 lug is firstly attached to the lower end face of the battery cell and is located in the lower end face area of the axial cavity of the battery cell, the battery cell is then arranged in a metal sleeve cup in a battery shell, and a second welding electrode is inserted into the axial cavity of the battery cell from top to bottom to weld the electrode lug on the inner surface of the bottom of the metal sleeve cup.
6. 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.
7. The button cell pole shell and electrode tab seamless welding method according to claim 1, characterized in that: the contact positions of the two first welding electrodes and the metal sleeve cup in different sub-steps S2 are not overlapped.
8. The button cell pole shell and electrode tab seamless welding method according to claim 1, characterized in that: the second welding electrode is firstly pressed on the outer surface of the electrode lug on the inner side of the metal sleeve cup, and then the cup bottom of the metal sleeve cup is pressed on the inner surface of the pole shell.
9. The button cell pole shell and electrode tab traceless welding method according to any one of claims 1 to 8, characterized in that: step S3 is performed first, and then steps S1 and S2 are performed in sequence, and at least 1 pair of second welding points are formed between the electrode tab and the metal cup through resistance welding of parallel welding in step S3.
10. The button cell pole shell and electrode tab traceless welding method according to any one of claims 1 to 8, characterized in that: the sequence of the step S2 is changed from that of the step S3, and at least 1 pair of second welding points are formed between the electrode tab and the metal sleeve cup in the step S3 by resistance welding of parallel welding.
11. A button cell pole shell and electrode lug seamless welding structure comprises a pole shell and an electrode lug, the electrode shell is cup-shaped, an electric core is arranged in the electrode shell, the electric core 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 an electrode lug, it is characterized in that a metal cup sleeve is fixedly arranged on the inner surface of any polar shell through a first welding point, the bottom of the metal sleeve cup is pressed against the inner surface of the pole shell, the electric core is sleeved in the metal sleeve cup, an insulating sheet is arranged between the bottom of the metal cup and the polar shell, the width of the insulating sheet is smaller than that of the metal cup, 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 bottom of the metal cup outside the coverage area of the insulating sheet; and an electrode tab corresponding to any one of the electrode shells is fixedly connected with the inner surface of the bottom of the metal sleeve cup through a second welding point, and the second welding point is positioned on the bottom of the metal sleeve cup in the coverage area of the insulating sheet.
12. The button cell pole shell and electrode tab seamless welding structure of claim 11, wherein: all the first welding points are uniformly distributed around the circumference by taking the center of the polar shell as a circle center.
13. The button cell pole shell and electrode tab seamless welding structure of claim 12, wherein: the first welding points of each pair are symmetrically distributed.
14. The button cell pole shell and electrode tab seamless welding structure of 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 shell and electrode tab seamless welding structure of claim 14, wherein: the second welding spot is positioned in a vertical projection area of the axial cavity of the battery cell on the bottom of the metal sleeve cup.
16. The button cell pole shell and electrode tab seamless welding structure of claim 15, wherein: the insulating sheet is located in the end face area of the axial cavity of the battery core.
17. The button cell pole shell and electrode tab seamless welding structure of claim 11, wherein: the insulating sheet is fixedly arranged on the outer side of the bottom of the metal sleeve cup.
18. The button cell pole shell and electrode tab seamless welding structure of claim 11, wherein the cross-sectional shape of the cup wall of the positive electrode metal sleeve cup is "┐" or "
And (4) shape.
19. 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; characterized in that at least one of the connection structure between the positive electrode shell and the positive electrode tab and the connection structure between the negative electrode shell and the negative electrode tab adopts the button cell pole shell and electrode tab seamless welding structure of any one of claims 11 to 18.
20. The button cell according to claim 19, wherein 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 coin cell electrode shell and electrode tab traceless welding structure of any one of claims 11 to 18, the other connection structure is: and directly welding electrode lugs on the inner surface of the corresponding pole shell in a resistance welding mode of parallel welding on the inner side of the pole shell, namely fixedly connecting the inner surface of the pole shell and the electrode lugs through third welding spots, wherein the number of the third welding spots is more than or equal to 1 pair, and two third welding spots of the same pair are arranged in a staggered mode.
21. A button cell according to claim 19 wherein: the connecting structure between the positive electrode shell and the positive electrode lug adopts the button cell pole shell and electrode lug traceless welding structure of any one of claims 11 to 18.
22. A button cell according to claim 21 wherein: the positive and negative electrode shells are partially overlapped in the vertical direction, the opening end wall of the negative electrode shell is positioned on the inner side of the opening end wall of the positive electrode shell, a gap is reserved between the opening end wall of the negative electrode shell and the opening end wall of the positive electrode shell, the insulating sealing ring is clamped in the gap, the lower end of the insulating sealing ring extends inwards to form a bent part, the opening end wall of the negative electrode shell is wrapped in the bent part, and an annular cavity is formed among the positive electrode shell, the battery cell and the bent part of the insulating sealing ring; the cup wall of the metal sleeve cup is embedded in the annular cavity, and the upper end of the cup wall of the metal sleeve cup is abutted to the bottom of the bending part of the insulating sealing ring.
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| CN111354910B (en) | 2023-12-05 |
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