CN111354910B - 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 PDF

Info

Publication number
CN111354910B
CN111354910B CN202010334035.4A CN202010334035A CN111354910B CN 111354910 B CN111354910 B CN 111354910B CN 202010334035 A CN202010334035 A CN 202010334035A CN 111354910 B CN111354910 B CN 111354910B
Authority
CN
China
Prior art keywords
electrode
welding
shell
metal sleeve
tab
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010334035.4A
Other languages
Chinese (zh)
Other versions
CN111354910A (en
Inventor
常海涛
苏盛
叶永锋
张志明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Original Assignee
Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian filed Critical Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Priority to CN202010334035.4A priority Critical patent/CN111354910B/en
Publication of CN111354910A publication Critical patent/CN111354910A/en
Application granted granted Critical
Publication of CN111354910B publication Critical patent/CN111354910B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Landscapes

  • 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 electrode 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 accommodating a battery cell on the inner surface of a cup-shaped electrode shell, pressing the bottom of the metal sleeve cup against the inner surface of the electrode shell, and arranging an insulating sheet between the bottom of the metal sleeve cup and the electrode 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 manner, and forming at least 1 pair of first welding spots between the pole shell and the metal sleeve cup, wherein the first welding spots are positioned on the bottom of the metal sleeve cup outside the coverage area of the insulating sheet; and then, welding the electrode lug on the inner surface of the metal sleeve cup bottom through resistance welding equipment, and forming a second welding spot between the electrode lug and the metal sleeve cup, wherein the second welding spot is positioned on the metal sleeve cup bottom in the coverage area of the insulating sheet. The welding structure is manufactured by the method and is applied to a button cell.

Description

Button cell electrode shell and electrode lug traceless welding method, welding structure and product
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, arranging a metal sleeve cup capable of accommodating a battery cell on the inner surface of a cup-shaped electrode shell, pressing the bottom of the metal sleeve cup against the inner surface of the electrode shell, and arranging an insulating sheet between the bottom of the metal sleeve cup and the electrode 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 propped against different positions on the inner surface of the metal sleeve cup bottom, the contact positions of the two first welding electrodes and the metal sleeve cup are positioned on the metal sleeve cup bottom outside the coverage area of the insulating sheet, then electrifying the two first welding electrodes to realize the welding fixed connection of the pole shell and the metal sleeve cup, 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 pole shell and the metal sleeve cup, and the welding positions of the metal sleeve cup and the pole shell can be overlapped in different steps S2;
S3: and then the electrode lug is jacked on the inner surface of the metal sleeve cup bottom, a second resistance welding device is prepared, the second resistance welding device comprises two second welding electrodes, the electrode lug is welded on the inner surface of the metal sleeve cup bottom 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 metal sleeve cup bottom in the coverage area of the insulating sheet.
According to the invention, the metal sleeve cup capable of containing the battery cell is arranged on the inner surface of the pole shell, the bottom of the metal sleeve cup is pressed against the inner surface of the pole shell, and the two first welding electrodes are respectively pressed against different positions on the inner surface of the bottom of the metal sleeve cup, so that the welding fixation between the metal sleeve cup and the pole shell is realized in a parallel welding resistance welding mode, and an annular welding current channel is formed between the two first welding electrodes, so that 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 bottom of the metal sleeve cup and the electrode shell, two second welding electrodes form annular welding current on the metal sleeve cup side of the insulating sheet, so that second welding spots are 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 passes through the first welding spots to realize current connection between the electrode shell and the metal sleeve cup, 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 and a new molten pool and welding spots (namely second welding spots) are formed at the connection position of the electrode lugs and the metal sleeve cup; 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; meanwhile, the number of the first welding spots between the metal sleeve and the electrode shell is large, and in view of the fact that the internal resistance of a welding position between the electrode shell and the metal sleeve is generally smaller than the internal resistance of a physical contact position between the electrode shell and the metal sleeve, the overall contact internal resistance between the electrode shell and the metal sleeve is smaller, and the smaller the contact internal resistance is, the more favorable is for discharging the battery; 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 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 on the inner side of the metal sleeve cup, the pressing position of the second welding electrode is located on the bottom of the metal sleeve cup 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 tab and the metal sleeve cup. 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 sleeve cup is located outside the outer contour of the insulation sheet coverage area, and at this time, 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 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 metal sleeve cup in a pole shell, a second welding electrode is inserted from top to bottom into the axial cavity of the battery cell to weld the electrode tab on the inner surface of the bottom of the metal sleeve cup, and at this time, the length of the electrode tab is not 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 sleeve cup and the pole shell, and the operation cost is reduced as much as possible and the working efficiency is improved while the metal sleeve cup 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 sleeve cup 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 sleeve cup is avoided.
In the specific implementation process, the second welding electrode can be propped against the outer surface of the electrode lug on the inner side of the metal sleeve cup, and then the bottom of the metal sleeve cup is propped 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 sleeve cup in 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 sleeve cup in the step S3 in a parallel welding manner.
The invention aims at providing a button battery electrode shell and electrode tab seamless welding structure, which comprises an electrode shell and an electrode tab, wherein the electrode shell is cup-shaped, a battery cell is arranged in the electrode shell, the battery cell 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 one electrode tab, a metal sleeve cup is fixedly arranged on the inner surface of any electrode shell through a first welding spot, the bottom of the metal sleeve cup is pressed against the inner surface of the electrode shell, the battery cell is sleeved in the metal sleeve cup, an insulating sheet is arranged between the bottom of the metal sleeve cup and the electrode shell, the width of the insulating sheet is smaller than the width of the metal sleeve 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 sleeve cup outside the coverage area of the insulating sheet; the electrode lug corresponding to any electrode shell is fixedly connected with the inner surface of the metal sleeve cup bottom through a second welding spot, and the second welding spot is positioned on the metal sleeve cup bottom 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 sleeve cup is large, the connection between the electrode shell and the metal sleeve cup 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 sleeve cup and the polar shell are most firmly connected. 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 positive plate, a negative plate 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 bottom of the metal sleeve cup. At this time, can place the electric core after the metal sleeve ring in the polar shell, through inserting the second welding electrode in the axial cavity of electric core with electrode tab roof pressure weld on the metal sleeve cup bottom of cup, 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 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 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 sleeve cup, the second welding point is only located in the covering area of the insulating sheet at the bottom of the metal sleeve cup.
Preferably, the insulating sheet is fixedly arranged on the outer side of the bottom of the metal sleeve cup, so that the displacement of the insulating sheet is better avoided.
Preferably, the cross-section of the wall of the positive electrode metal sleeve cup is L-shaped or L-shaped.
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.
Preferably, the connection structure between the positive electrode shell and the positive electrode tab adopts the button cell tab shell and electrode tab seamless welding structure. Further 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 at 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 electric 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 electrode case, the negative electrode case, and the insulating seal ring of the button cell are assembled, the final sealing process is performed by pressing the open end wall of the positive electrode case inward. In the sealing process, the downward pressing force is transmitted to the cup wall of the metal sleeve cup of the positive electrode in the inward bending process of the opening end wall of the positive electrode shell, 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 diagram of a welding operation between a pole casing and a metal sleeve in embodiment 1, wherein the pole casing, the metal sleeve and an insulating sheet are cross-sectional views;
fig. 2 is a schematic diagram of a welding operation between an electrode tab and a metal sleeve in embodiment 1, wherein a pole case, the metal sleeve and an 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 to 3, in the method for welding a button cell electrode shell and an electrode tab without any trace, the electrode shell 10 is cup-shaped, a battery cell 30 is installed in the electrode shell 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 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, arranging a metal sleeve cup 40 capable of accommodating a battery cell 30 on the inner surface of a cup-shaped electrode shell 10, pressing a cup bottom 40a of the metal sleeve cup 40 against the inner surface of the electrode shell 10, arranging an insulating sheet 80 between the cup bottom 40a of the metal sleeve cup and the electrode shell, and enabling the width D of the insulating sheet 80 to be smaller than the width D' of the cup bottom 40a of the metal sleeve cup;
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 inner surface of the metal sleeve cup bottom 40a, the contact positions of the two first welding electrodes (100, 200) and the metal sleeve cup 40 are positioned on the metal sleeve cup bottom 40a 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 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 spots 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 different steps S2 can be overlapped;
s3: then, the electrode lug 20 is propped against the inner surface of the metal sleeve cup bottom 40a, a second resistance welding device is prepared, the second resistance welding device comprises two second welding electrodes (300 and 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 sleeve cup bottom 40a 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 metal sleeve cup 40, and the propping position of the second welding electrode 300 is positioned on the metal sleeve cup bottom 40a 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 sleeve cup 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 cup bottom 40a in the embodiment described refers to the outer contour of the vertical projection area of the columnar electrode 400 on the metal cup bottom 40 a; the outer contour 80' of the area covered by the insulating sheet 80 on the metal sleeve bottom 40a refers to the outer contour of the vertical projection area of the insulating sheet 80 on the metal sleeve bottom 40 a.
Referring to fig. 1 to 3, a welding structure manufactured by a method for welding a button cell electrode shell and an electrode tab according to embodiment 1 includes a electrode shell 10 and an electrode tab 20, the electrode shell 10 is cup-shaped, a battery cell 30 is installed in the electrode shell 10, the battery cell 30 is mainly formed by stacking or winding a positive electrode sheet 31, a negative electrode sheet 32 and a diaphragm 33 in layers, the positive electrode sheet and the negative electrode sheet (31, 32) are respectively electrically connected with the electrode tab 20, a metal sleeve cup 40 is fixedly arranged on the inner surface of any electrode shell 10 through a first welding point 50, a cup bottom 40a of the metal sleeve cup is pressed against the inner surface of the electrode shell 10, the battery cell 30 is sleeved in the metal sleeve cup 40, the width of the insulation sheet 80 is smaller than the width of the cup bottom 40a of the metal sleeve cup, the number of the first welding points 50 is 1 pair, the first welding points 50 of different pairs can be overlapped, all the first welding points 50 of the same pair are arranged in a staggered manner, and all the first welding points 50 of the first welding points of the first pair are arranged outside the metal sleeve cup bottom 80; the electrode tab 20 corresponding to any one of the electrode cases 10 is fixedly connected to the inner surface of the metal cup bottom 40a through a second welding point 60, and the second welding point 60 is located on the metal cup bottom 40a in 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 metal sleeve cup 40 and the utmost point shell 10, the connection stability between metal sleeve cup 40 and the utmost point shell 10 is better, simultaneously, the solder joint quantity between metal sleeve cup 40 and the utmost point shell 10 is many, also can reduce the contact internal resistance between metal sleeve cup 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 positive electrode tab 11, and the electrode tab 20 electrically connected to the tab is the positive electrode tab 21 electrically connected to the positive electrode tab 31; of course, in the case of the button cell tab and electrode tab seamless welding method and welding structure, when the tab 10 is the negative electrode tab 12, the electrode tab 20 electrically connected to the tab is the negative electrode tab 22 electrically connected to the negative electrode tab 32.
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; among the connection structure between the negative electrode case 12 and the negative electrode tab 22 and the connection structure between the positive electrode case 11 and the positive electrode tab 21, only 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, specifically as follows:
The connection structure between the positive electrode shell 11 and the positive electrode tab 21 is as follows: the positive metal sleeve cup 41 is fixedly arranged on the inner surface of the positive shell 11 through positive first welding spots 51, the positive metal sleeve cup 41 is provided with a cup bottom 41a and a cup wall 41b, the cup bottom 41a of the positive metal sleeve cup is pressed against the inner surface of the positive shell 11, a positive insulating sheet 81 is arranged between the cup bottom 41a of the positive metal sleeve cup and the positive shell 11, the width of the positive insulating sheet 81 is smaller than that of the cup bottom 41a of the positive metal sleeve cup, the number of the positive first welding spots 51 is 1 pair, the positive first welding spots 51 of different pairs can be overlapped, the two positive first welding spots 51 of the same pair are arranged in a staggered mode, and all the positive first welding spots 51 are positioned on the positive metal sleeve cup bottom 41a outside the coverage area of the positive insulating sheet 81; the positive electrode tab 21 is fixedly connected with the outer surface of the positive electrode metal sleeve cup 41 through a positive electrode second welding point 61, and the positive electrode second welding point 61 is positioned on the negative electrode metal sleeve cup bottom 41a in the coverage area of the positive electrode insulating sheet 81;
the connection structure between the negative electrode shell 12 and the negative electrode tab 22 is as follows: inside the negative electrode shell 12, the negative electrode tab 22 is welded on the inner surface of the negative electrode shell 12 by a parallel welding resistance welding mode, namely, the inner surface of the negative electrode shell 12 and the negative electrode tab 22 are fixedly connected by third welding spots 300, the number of the third welding spots 300 is 1 pair, and adjacent third welding spots 300 are arranged in a staggered manner.
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 cup 40 and the pole case 10 of the two welding positions of step S2 were overlapped, and the other steps were the same as in 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 is performed 3 times, 3 pairs of first welding spots 50 are formed between the metal sleeve 40 and the pole case 10, and in the different steps S2, there is no overlap between the welding positions of the metal sleeve 40 and the pole case 10, and the other steps are 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 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 both adopt the button cell tab and electrode tab seamless welding structure of embodiment 1, and the connection structure between the negative electrode shell 12 and the negative electrode tab 22 is as follows:
the negative electrode metal sleeve cup 42 is fixedly arranged on the inner surface of the negative electrode shell 12 through negative electrode first welding spots 52, the negative electrode metal sleeve cup 42 is provided with a cup bottom 42a and a cup wall 42b, the cup bottom 42a of the negative electrode metal sleeve cup is pressed against the inner surface of the negative electrode shell 12, a negative electrode insulating sheet 82 is arranged between the cup bottom 42a of the negative electrode metal sleeve cup and the negative electrode shell 12, the width of the negative electrode insulating sheet 82 is smaller than that of the cup bottom 42a of the negative electrode metal sleeve cup, 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 sleeve cup bottom 42a outside the coverage area of the negative electrode insulating sheet 82; the negative electrode tab 22 is fixedly connected with the inner surface of the negative electrode metal sleeve cup 42 through a negative electrode second welding point 62, and the negative electrode second welding point 62 is positioned on the negative electrode metal sleeve cup bottom 42a in the coverage area of the negative electrode insulating sheet 82.
Generally, the electrode tab 20 is a metal foil that can be bent at will.
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 metal sleeve 40", and the welding and fixing connection of the electrode tab 20 and the metal sleeve 40 may be realized by parallel welding of the two second welding electrodes (300, 400) in 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, the second welding electrode (300, 400) may be pressed against the outer surface of the electrode tab 20 on the inner side of the metal sleeve cup 40, and then the bottom 40a of the metal sleeve cup may be pressed against the inner surface of the electrode case 10.
Preferably, as shown in fig. 2, in the button cell electrode case and electrode tab traceless welding method of the present invention, the electric core 30 is mainly formed by winding the positive electrode tab 31, the negative electrode tab 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 lower end surface area of the axial cavity 34 of the electric core 30, then the electric core 30 is placed in the metal sleeve 40 in the electrode case 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 inner surface of the metal sleeve 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 inner surface of the metal cup 40, and then the battery cell 30 may be mounted in the metal cup 40 in the electrode case 10.
The seamless welding structure of the button cell electrode case and the electrode tab of each of embodiments 1 to 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 sleeve 40 and the pole casing 10 are most firmly connected. 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 positive electrode sheet 31, a negative electrode sheet 32 and a separator 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 the vertical projection area of the axial cavity 34 of the cell on the metal cup 40. At this time, after the battery cell 30 is placed in the metal sleeve cup 40 in the electrode shell 10, the electrode tab 20 is pressed against the metal sleeve cup 40 to be welded 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 sleeve 40 outside the vertical projection area of the core cavity 34, where the electrode tab 20 needs to be welded on the metal sleeve 40 before the core 30 is assembled into the electrode case 10, and then the core 30 is turned into the metal sleeve 40 in 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 metal sleeve 40 in the electrode shell 10, when the electrode tab 20 is pressed against the metal sleeve 40 to be welded by inserting the second welding electrode 300 into the axial cavity 34 of the cell, the second welding point 60 is only located within the coverage area of the insulating sheet 80 on the metal sleeve 40;
(3) The insulating sheet 80 is fixedly arranged on the outer side of the bottom 40a of the metal sleeve cup, so that the displacement of the insulating sheet is better avoided;
(4) As shown in fig. 4 and 7, the cross-sectional shape of the cup wall 40b of the metal cup 40 is a "l" shape or a "l" shape. Of course, the cross-sectional shape of the wall 40b of the positive electrode cup 40 is not limited to be a "l" shape or a "h" shape, and may be any other common shape or special shape such as a T shape.
The button cells of example 1 and example 4 can each be modified as follows: as shown in fig. 4 and 7, the connection structure between the positive electrode case 11 and the positive electrode tab 21 adopts the above-mentioned button cell case and electrode tab seamless welding structure. Further preferably, as shown in fig. 4 and 7, the positive and negative electrode cases (11, 12) are partially overlapped in the vertical direction, the open end wall of the negative electrode case 12 is located inside the open end wall of the positive electrode case 11, a gap is left between the open end wall of the negative electrode case 12 and the open end wall of the positive electrode case 11, the insulating seal ring 70 is clamped in the gap, the lower end of the insulating seal ring 70 extends inwards to form a bending part 71, the bending part 71 wraps the open end wall of the negative electrode case 12 therein, and an annular cavity 500 is formed among the positive electrode case 11, the battery cell 30 and the insulating seal ring bending part 71; the cup wall 41b of the positive metal cup 41 is embedded in the annular cavity 500, and the upper end of the cup wall 41b of the positive metal cup 41 abuts against the bottom of the insulating seal ring bending part 71. Generally, after the positive electrode case 11, the negative electrode case 12, and the insulating seal 70 of the button cell are assembled, a final sealing process is performed by pressing the open end wall of the positive electrode case 11 inward. In this sealing process, the downward pressing force is transmitted to the cup wall 41b of the positive metal sleeve 41 during the inward bending process of the opening end wall of the positive electrode can 11, so that the physical contact between the cup bottom 41a of the metal sleeve 41 and the positive electrode can 11 is tighter, and the electrical contact stability is improved.
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 the welding is performed in the sequence of "step S3-step S1-step S2", and at least 1 pair of second welding spots 62 "are formed between the electrode tab 22 and the metal cup 42 in the step S3 by means of parallel welding (the obtained welding structure is shown in fig. 8), 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 any existing connection manner capable of realizing electrical connection between the electrode tab and the corresponding electrode case, such as welding the electrode tab on the metal sleeve cup, fixing the metal sleeve cup on the inner surface of the corresponding electrode case by means of parallel welding resistance welding or coating conductive adhesive on the inner side of the electrode case, or directly fixing the electrode tab on the inner surface of the corresponding electrode case by means of parallel welding resistance welding or coating conductive adhesive. In addition, the first welding point 50 of the present invention is not limited to 1 welding point in the drawings, and may be 2 or more than 2 welding points. The structure of the battery cell 30 of the present invention is not limited to the specific structure shown in the drawings, and any battery cell structure may be used.

Claims (22)

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, arranging a metal sleeve cup capable of accommodating a battery cell on the inner surface of a cup-shaped electrode shell, pressing the bottom of the metal sleeve cup against the inner surface of the electrode shell, and arranging an insulating sheet between the bottom of the metal sleeve cup and the electrode 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 propped against different positions on the inner surface of the metal sleeve cup bottom, the contact positions of the two first welding electrodes and the metal sleeve cup are positioned on the metal sleeve cup bottom outside the coverage area of the insulating sheet, then electrifying the two first welding electrodes to realize the welding fixed connection of the pole shell and the metal sleeve cup, 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 pole shell and the metal sleeve cup, and the welding positions of the metal sleeve cup and the pole shell can be overlapped in different steps S2;
S3: and then the electrode lug is jacked on the inner surface of the metal sleeve cup bottom, a second resistance welding device is prepared, the second resistance welding device comprises two second welding electrodes, the electrode lug is welded on the inner surface of the metal sleeve cup bottom 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 metal sleeve cup bottom 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 against the outer surface of the electrode lug on the inner side of the metal sleeve cup, the propping position of the second welding electrode is positioned on the cup bottom of the metal sleeve cup 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 sleeve cup.
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 sleeve cup 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, an electrode lug is attached to the lower end face of the battery cell, the electrode lug is located in the area of the lower end face of the axial cavity of the battery cell, the battery cell is placed in a metal sleeve cup 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 lug on the inner surface of the cup bottom of the metal sleeve cup.
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 sleeve cup 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: the second welding electrode is firstly propped against the outer surface of the electrode lug at the inner side of the metal sleeve cup, and then the bottom of the metal sleeve cup 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 sleeve cup in 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 sleeve cup in the step S3 in a parallel welding manner.
11. The button battery electrode shell and electrode tab seamless welding structure 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 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 lug corresponding to any electrode shell is fixedly connected with the inner surface of the metal sleeve cup bottom through a second welding spot, and the second welding spot is positioned on the metal sleeve cup bottom 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 positive plate, a negative plate 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 cup bottom of the metal sleeve cup.
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 outer side of the bottom of the metal sleeve cup.
18. The button cell pole case and electrode tab traceless welding structure according to claim 11, wherein: the cross section shape of the cup wall of the positive electrode metal sleeve cup is L-shaped or L-shaped ""shape".
19. 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 button cell is characterized in that at least one of a connecting structure between the positive electrode shell and the positive electrode lug and a connecting structure between the negative electrode shell and the negative electrode lug adopts the button cell electrode shell and electrode lug seamless welding structure as claimed in any one of claims 11-18.
20. The button cell of claim 19, 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 button cell tab and electrode tab seamless welding structure of any one of claims 11 to 18, 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.
21. The button cell as defined in claim 19, wherein: the connecting structure between the positive electrode shell and the positive electrode lug adopts the button cell electrode shell and electrode lug seamless welding structure of any one of claims 11-18.
22. The button cell as defined in claim 21, wherein: the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, the opening end wall of the negative electrode shell is positioned at 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 electric 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.
CN202010334035.4A 2020-04-24 2020-04-24 Button cell electrode shell and electrode lug traceless welding method, welding structure and product Active CN111354910B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010334035.4A CN111354910B (en) 2020-04-24 2020-04-24 Button cell electrode shell and electrode lug traceless welding method, welding structure and product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010334035.4A CN111354910B (en) 2020-04-24 2020-04-24 Button cell electrode shell and electrode lug traceless welding method, welding structure and product

Publications (2)

Publication Number Publication Date
CN111354910A CN111354910A (en) 2020-06-30
CN111354910B true CN111354910B (en) 2023-12-05

Family

ID=71197784

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010334035.4A Active CN111354910B (en) 2020-04-24 2020-04-24 Button cell electrode shell and electrode lug traceless welding method, welding structure and product

Country Status (1)

Country Link
CN (1) CN111354910B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111834558B (en) * 2020-08-10 2024-05-07 惠州亿纬锂能股份有限公司 Electronic device and manufacturing method thereof
JP7434695B2 (en) * 2020-09-25 2024-02-21 エルジー エナジー ソリューション リミテッド button type secondary battery
CN114937855B (en) * 2022-03-30 2024-05-14 江苏正力新能电池技术有限公司 Preparation method of cylindrical battery and cylindrical battery

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102117895A (en) * 2010-11-19 2011-07-06 广州市鹏辉电池有限公司 Positive steel shell of button lithium battery and button lithium battery
JP2017130435A (en) * 2016-01-15 2017-07-27 セイコーインスツル株式会社 Electrochemical cell
CN206639838U (en) * 2017-04-01 2017-11-14 深圳市秸川材料科技有限公司 Button cell with afflux ring support
CN110336065A (en) * 2019-05-15 2019-10-15 广东微电新能源有限公司 Button-type battery and its manufacturing method
CN211957776U (en) * 2020-04-24 2020-11-17 福建南平延平区南孚新能源科技有限公司 Button cell pole shell and electrode lug seamless welding structure
CN211957808U (en) * 2020-04-24 2020-11-17 福建南平延平区南孚新能源科技有限公司 Button cell with no trace welded structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102117895A (en) * 2010-11-19 2011-07-06 广州市鹏辉电池有限公司 Positive steel shell of button lithium battery and button lithium battery
JP2017130435A (en) * 2016-01-15 2017-07-27 セイコーインスツル株式会社 Electrochemical cell
CN206639838U (en) * 2017-04-01 2017-11-14 深圳市秸川材料科技有限公司 Button cell with afflux ring support
CN110336065A (en) * 2019-05-15 2019-10-15 广东微电新能源有限公司 Button-type battery and its manufacturing method
CN211957776U (en) * 2020-04-24 2020-11-17 福建南平延平区南孚新能源科技有限公司 Button cell pole shell and electrode lug seamless welding structure
CN211957808U (en) * 2020-04-24 2020-11-17 福建南平延平区南孚新能源科技有限公司 Button cell with no trace welded structure

Also Published As

Publication number Publication date
CN111354910A (en) 2020-06-30

Similar Documents

Publication Publication Date Title
CN111354910B (en) Button cell electrode shell and electrode lug traceless welding method, welding structure and product
CN111370635B (en) Production method of button cell without welding trace and prepared button cell
JP2010511992A (en) Cylindrical secondary battery and manufacturing method thereof
JP2010511992A6 (en) Cylindrical secondary battery and manufacturing method thereof
CN111354914B (en) Button cell electrode shell and electrode lug traceless welding method, welding structure and product
CN111354912B (en) Electric connection method, electric connection structure and product of button cell pole shell and electrode lug
CN111370637B (en) Production method of button cell without welding trace and prepared button cell
CN111463371B (en) Anti-seepage welding method and welding structure of button battery and application of anti-seepage welding method and welding structure
US11850673B2 (en) Button cell and method for welding electrode tabs to a pole shell of the button cell
CN111354909B (en) Button cell electrode shell and electrode lug traceless welding method, welding structure and product
CN112054236A (en) Storage battery and manufacturing method thereof
CN111354911B (en) Button cell electrode shell and electrode lug traceless welding method, welding structure and product
CN211578865U (en) Button cell pole shell and electrode lug seamless welding structure
CN211578867U (en) Button cell without welding trace
CN111370638B (en) Production method of button cell without welding trace and prepared button cell
CN111354916A (en) Electric connection method, electric connection structure and product of button cell pole shell and electrode lug
CN211957808U (en) Button cell with no trace welded structure
CN211957776U (en) Button cell pole shell and electrode lug seamless welding structure
CN211578868U (en) Button cell pole shell and electrode lug seamless welding structure
CN211789242U (en) Button cell pole shell and electrode lug seamless welding structure
CN211789307U (en) Button cell with no trace welded structure
CN111354915B (en) Button cell electrode shell and electrode lug traceless welding method, welding structure and product
CN211578866U (en) Button cell pole shell and electrode lug seamless welding structure
CN111354913B (en) Button cell electrode shell and electrode lug traceless welding method, welding structure and product
CN111370636B (en) Production method of button cell without welding trace and prepared button cell

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant