CN111370638B - Production method of button cell without welding trace and prepared button cell - Google Patents
Production method of button cell without welding trace and prepared button cell Download PDFInfo
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- CN111370638B CN111370638B CN202010391092.6A CN202010391092A CN111370638B CN 111370638 B CN111370638 B CN 111370638B CN 202010391092 A CN202010391092 A CN 202010391092A CN 111370638 B CN111370638 B CN 111370638B
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- 238000003466 welding Methods 0.000 title claims abstract description 149
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 90
- 239000002184 metal Substances 0.000 claims abstract description 90
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 22
- 238000005452 bending Methods 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims 1
- 229910001416 lithium ion Inorganic materials 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Classifications
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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
-
- 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
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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 production method of a button cell without welding marks and the button cell manufactured by the production method, wherein the electric connection method between a negative electrode tab and a negative electrode shell is as follows: firstly, welding one end of a negative electrode tab extending out of a battery core on a metal sheet, and then welding the metal sheet on the inner surface of a negative electrode shell in a parallel welding resistance welding mode, so that electric connection between the negative electrode tab and the negative electrode shell is realized; the electric connection method between the positive electrode lug and the positive electrode shell comprises the following steps: an annular sleeve in a through hole shape is sleeved outside the end part of the battery cell, which is close to one end of the positive electrode shell, the annular sleeve is positioned in the positive electrode shell, a tab clamping interval is formed between the outer side wall of the annular sleeve and the opening end wall of the positive electrode shell, one end of the positive electrode tab, which extends out of the battery cell, is bent upwards from the lower part of the annular sleeve along the outer side wall of the annular sleeve and extends into the tab clamping interval, so that electric connection between the positive electrode tab and the positive electrode shell is realized, and the surface of the prepared button battery is smooth and intact.
Description
Technical Field
The invention relates to the field of button cells, in particular to a production method of a button cell without welding marks and the prepared button cell.
Background
Button cells (button cells) are also called button cells, and are cells having a larger outer dimension like a small button, and generally have a larger diameter and a thinner thickness (compared with cylindrical cells such as 5 AA on the market), the button cells are classified from the outer dimension into cylindrical cells, prismatic cells, and shaped cells.
Button cells include stacked and wound cells. The basic structure of the winding button cell is as follows: the battery comprises a first pole shell, a second pole shell, an insulating sealing ring and an electric core, wherein the upper opening and the lower opening of the first pole shell are oppositely buckled with each other to form a cylindrical button battery shell; a gap is reserved between the first pole shell and the second pole shell, the gap is filled with an insulating sealing ring to electrically isolate the first pole shell from the second pole shell, and a containing cavity is formed among the first pole shell, the second pole shell and the insulating sealing ring; the electric core is located in the holding chamber, the electric core includes first pole piece, second pole piece and diaphragm, through the diaphragm interval between first pole piece and the second pole piece, first pole piece, second pole piece and diaphragm are convoluteed and are made the electric core, the center of electric core is formed with axial cavity, be equipped with first output conductor on the first pole piece, first output conductor stretches out and welds with first utmost point shell from the electric core, be equipped with the second output conductor on the second pole piece, the second output conductor stretches out and welds with the second utmost point shell from the electric core. When the existing winding type button battery is manufactured, the first output conductor of the battery core is bent to enable the first output conductor to be closely attached to the lower surface of the battery core, and the first output conductor extends to the position right below the axial cavity; then vertically loading the battery cell into the first pole shell; welding the first output conductor and the first pole shell together by means of electric resistance welding by vertically inserting a welding pin downwards into the axial cavity and pressing the first output conductor on the first shell, or welding the first pole shell and the first output conductor together by means of laser welding by emitting laser from below the first pole shell to the area of the first pole shell, which is overlapped with the first output conductor up and down; welding a second output conductor of the battery core on a second electrode shell, wherein an insulating sealing ring is sleeved outside the second electrode shell; and finally, covering the second pole shell and the insulating sealing ring at the opening of the upper end of the first pole shell together for sealing. One of the first pole shell and the second pole shell forms a battery positive pole loop with the corresponding output conductor and the corresponding battery cell pole piece, and the other pole shell forms a battery negative pole loop with the corresponding output conductor and the corresponding battery cell pole piece. Because the first output conductor and the first polar shell are welded, the current of resistance welding and the laser beam of laser welding can penetrate through the first polar shell, and the welding spots for connecting the first polar shell and the first output conductor are arranged through the first polar shell, the surface flatness and stability of the first polar shell are damaged, and the phenomena of electrolyte leakage, surface bulge and the like are easy to occur at the welding spot position of the first polar shell in the use process of the battery.
Disclosure of Invention
The invention aims to provide a production method of a button cell without welding marks, which can keep the surface of a pole shell smooth and intact, and further avoid the phenomena of electrolyte leakage, surface bulge and the like.
The button cell comprises a positive electrode shell and a negative electrode shell which are cup-shaped, wherein the positive electrode shell and the negative electrode shell can be oppositely buckled with each other through upper and lower openings to form a cylindrical button cell shell; the battery cell is packaged in the cylindrical button battery shell in a matching way, the battery cell is mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, 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, the negative electrode tab is electrically connected with a negative electrode shell, and the electric connection method between the positive electrode tab, the negative electrode tab and the corresponding electrode shell comprises the following steps:
s1: preparing a metal sheet, welding one end of a negative electrode tab extending out of the battery core on the metal sheet, forming a first welding spot between the negative electrode tab and the metal sheet, and then horizontally placing the metal sheet in a negative electrode shell;
s2: preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first needle electrodes, a metal sheet is propped against the inner surface of a negative electrode shell, the two first needle electrodes are respectively propped against different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and a negative electrode tab in the step S1, then the two first needle electrodes in the step are electrified to realize the fixed connection of the negative electrode shell and the metal sheet, the welding step in the step S2 is carried out for 1 time or more, at least 1 pair of second welding spots are formed between the metal sheet and the negative electrode shell, and the welding positions of the metal sheet and the negative electrode shell in the different steps S2 can be overlapped;
s3: the positive electrode tab and the positive electrode shell are electrically connected in the following manner: an annular sleeve in a through hole shape is sleeved outside the end part of the battery cell, which is close to one end of the positive electrode shell, the annular sleeve is positioned in the positive electrode shell, a tab clamping interval is formed between the outer side wall of the annular sleeve and the opening end wall of the positive electrode shell, and one end of the positive electrode tab, which extends out of the battery cell, is bent upwards from the lower part of the annular sleeve along the outer side wall of the annular sleeve and extends into the tab clamping interval.
According to the welding method between the negative electrode tab and the negative electrode shell, before the metal sheet is arranged in the negative electrode shell, one end of the negative electrode tab, which extends out of the battery core, is welded on the metal sheet, after the metal sheet is arranged in the negative electrode shell, the metal sheet is welded on the negative electrode shell from the inside of the negative electrode shell in a parallel welding resistance welding mode, meanwhile, two first needle electrodes which limit resistance welding are welded on the outer surface of the metal sheet outside the welding position of the metal sheet and the negative electrode tab respectively, after the two first needle electrodes are electrified, an annular welding current channel is formed between the two first needle electrodes, welding current does not penetrate through the negative electrode shell, so that a molten pool and welding spots are formed only on the inner side of the negative electrode shell, the appearance of the negative electrode shell is kept complete, the risk of battery leakage caused by welding spots is avoided, and at least 1 pair of second electrodes are formed between the metal sheet and the negative electrode shell, the connection stability between the welding spots is better, meanwhile, the number of welding spots between the metal sheet and the negative electrode shell is more, and the internal resistance between the welding positions between the metal sheet are generally smaller than that between the welding positions between the negative electrode shell and the metal sheet are in physical contact with the metal sheet, and the whole battery is more advantageous in that the internal resistance between the battery is in contact with the whole battery, and the battery is smaller; in addition, the welding quality between the cathode tab and the cathode shell is also conveniently detected, and the cold joint is avoided; and, the one end that stretches out the electric core of anodal utmost point ear upwards buckles along this annular sleeve's lateral wall from this annular sleeve's below and extends to in the utmost point ear clamping section for the one end that stretches out the electric core of anodal utmost point ear presss from both sides tightly in the utmost point ear clamping section, realizes the electricity through being connected between the opening end wall of anodal utmost point ear and anodal shell and connects, keeps the anodal shell intact, and in addition, annular sleeve still plays the effect of fixed electric core.
In order to make the contact between the positive electrode tab and the open end wall of the positive electrode case more compact, it is preferable that, after step S3, a recess is formed in the open end wall of the positive electrode case by pressing the open end wall of the positive electrode case inward in the radial direction of the positive electrode case, the recess abuts against the positive electrode tab in the tab clamping section, and the annular sleeve is further provided to protect the battery cell from damage during the formation of the recess.
Preferably, the step S2 is continuously performed for 1-3 times, so that 1-3 pairs of second welding spots are formed between the metal sheet and the cathode shell, and the operation cost is reduced as much as possible and the working efficiency is improved while the metal sheet and the cathode shell are reliably welded together.
Preferably, the contact positions of the two first needle electrodes and the metal sheet in the different sub-steps S2 are not overlapped, so that the trouble of needle pulling caused by the fact that the needle electrodes are bonded with the metal sheet due to expansion of a molten pool when the second welding spots in the different sub-steps S2 are overlapped is avoided.
In the specific implementation process, in step S2, the two first needle electrodes of the resistance welding may be pressed against different positions on the outer surface of the metal sheet except the welding position of the metal sheet and the negative electrode tab, and then the metal sheet may be pressed against the inner surface of the negative electrode shell.
In the specific implementation process, in the step S1, any one of laser welding or resistance welding is adopted between the metal sheet and the negative electrode tab.
In a specific implementation process, step S3 may be performed first, and then steps S1 and S2 may be performed sequentially.
Whether the step S3 is performed first, the steps S1 and S2 are performed later, or the steps S1 and S2 are performed first, and the step S3 is performed later, the order of the steps S1 and S2 can be changed, and at this time, at least 1 pair of first welding spots are formed between the negative electrode tab and the metal sheet in the step S1 by a parallel welding resistance welding mode.
The second object of the invention is to provide a button cell without welding trace, which comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery cell, wherein the positive electrode shell and the negative electrode shell are cup-shaped, and the upper opening and the lower opening of the positive electrode shell and the lower opening of the negative electrode shell are oppositely buckled to form a cylindrical button cell shell; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring to electrically isolate the positive electrode shell from the negative electrode shell, and a containing cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and is mainly formed by layering or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive electrode tab, the positive electrode tab is electrically connected with a positive electrode shell, the negative plate is electrically connected with a negative electrode tab, and the negative electrode tab is electrically connected with a negative electrode shell; the connection structure between the negative electrode tab and the negative electrode shell is as follows: one end of the negative electrode tab, which extends out of the battery core, is fixedly connected with the outer surface of a metal sheet through a first welding spot, the metal sheet is horizontally and fixedly arranged on the inner surface of the negative electrode shell through a second welding spot, the number of the second welding spots is more than or equal to 1 pair, the second welding spots of different pairs can be overlapped, the two second welding spots of the same pair are arranged in a staggered manner, and meanwhile, the first welding spot and the second welding spot are arranged in a staggered manner; the connection structure between the positive electrode lug and the positive electrode shell is as follows: the end part of the battery cell, which is close to one end of the positive electrode shell, is sleeved with a through-hole-shaped annular sleeve, the annular sleeve is positioned in the positive electrode shell, a tab clamping interval is formed between the outer side wall of the annular sleeve and the opening end wall of the positive electrode shell, and one end of the positive electrode tab, which extends out of the battery cell, is bent upwards from the lower part of the annular sleeve along the outer side wall of the annular sleeve and extends into the tab clamping interval.
In the button battery, the first welding spots and the second welding spots are positioned on the inner side of the electrode shell in the welding structure between the negative electrode tab and the negative electrode shell, the outer surface of the negative electrode shell is kept smooth and intact, the number of the second welding spots between the metal sheets and the negative electrode shell is large, the connection between the negative electrode shell and the metal sheets is firmer, the contact internal resistance is smaller, meanwhile, the number of the third welding spots between the negative electrode tab and the negative electrode shell is large, the connection between the negative electrode tab and the negative electrode shell is firmer, the contact internal resistance is small, and the contact internal resistance is small, thereby being beneficial to improving the discharge efficiency of the battery; meanwhile, one end of the positive electrode tab, which extends out of the battery core, is bent upwards from the lower side of the annular sleeve along the outer side wall of the annular sleeve and extends into the tab clamping section, so that one end of the positive electrode tab, which extends out of the battery core, is clamped in the tab clamping section, and electric connection is realized through physical contact connection between the positive electrode tab and the opening end wall of the positive electrode shell, so that the positive electrode shell is kept intact.
In order to make the contact between the positive electrode tab and the open end wall of the positive electrode case tighter, it is preferable that a recessed portion recessed inward in the radial direction of the positive electrode case is provided on the open end wall of the positive electrode case, and the recessed portion abuts against the positive electrode tab in the tab clamping section. Further preferably, an annular concave part is arranged on the end wall of the opening of the positive electrode shell along the circumferential direction of the end wall, so that the manufacturing is convenient.
Preferably, all the second welding spots are uniformly distributed around the circumference by taking the center of the cathode shell as the center of the circle. More preferably, the second welding spots of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is facilitated.
Preferably, the 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 edge of 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 annular sleeve is embedded in the annular cavity, and the end face of one end of the annular sleeve, which is far away from the positive electrode shell, is abutted with the bottom of the bending part of the insulating sealing ring. This structure allows for better overall stability of the battery.
Drawings
Fig. 1 is a schematic diagram of a welding structure between a negative electrode tab and a metal sheet in any one of embodiments 1 to 3, wherein the metal sheet is a cross-sectional structure diagram;
fig. 2 is a schematic diagram of a welded structure of a negative electrode case and a metal sheet according to any one of embodiments 1 to 3, wherein the negative electrode case and the metal sheet are both cross-sectional structure diagrams;
fig. 3 is a top view of the negative electrode case of example 1;
FIG. 4 is a schematic cross-sectional view of a button cell without weld marks according to any one of embodiments 1 to 3;
FIG. 5 is an enlarged view of portion A of FIG. 4;
fig. 6 is a top view of the negative electrode case of example 2;
fig. 7 is a top view of the negative electrode case of example 3;
wherein the dashed circle 60 in fig. 3, 5 and 6 indicates the point location of the second weld spot.
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. 1-4, a method for producing a button cell without welding marks includes a positive electrode shell 11 and a negative electrode shell 12, wherein the positive electrode shell 11 and the negative electrode shell 12 are cup-shaped, and the positive electrode shell 11 and the negative electrode shell 12 can be oppositely buckled with each other through upper and lower openings to form a cylindrical button cell shell; the battery cell 30 is packaged in the cylindrical button battery shell in a matching way, the battery cell 30 is mainly formed by 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 a positive electrode shell 11, the negative plate 32 is electrically connected with a negative electrode tab 22, the negative electrode tab 22 is electrically connected with a negative electrode shell 12, and the electrical connection method between the positive electrode tab (21; 22) and the negative electrode tab (22) and the corresponding electrode shell (11; 12) comprises the following steps:
s1: preparing a metal sheet 40, welding one end of the negative electrode tab 22 extending out of the battery cell 30 on the metal sheet 40, forming a first welding spot 50 between the negative electrode tab 22 and the metal sheet 40, and then horizontally placing the metal sheet 40 in the negative electrode shell 11;
s2: pressing the metal sheet 40 on the inner surface of the negative electrode shell 11, preparing a first resistance welding device, wherein the first resistance welding device comprises two first needle electrodes (100, 200), pressing the two first needle electrodes (100, 200) on different positions on the outer surface of the metal sheet 40 except for the welding position of the metal sheet 40 and the negative electrode tab 22 in the step S1 respectively, then electrifying the two first needle electrodes (100, 200) in the step to realize the fixed connection of the negative electrode shell 12 and the metal sheet 40, performing the welding step in the step S2 for 1 time or more, forming at least 1 pair of second welding spots 60 between the metal sheet 40 and the negative electrode shell 11, and overlapping the welding positions of the metal sheet 40 and the negative electrode shell 11 in the step S2;
step S2 is performed only once, and the number of second welding spots 60 is 1 pair;
and S3, electrically connecting the positive electrode tab 21 and the positive electrode shell 11 in the following way: an annular sleeve 80 in a through hole shape is sleeved outside the end part of the battery cell 30, which is close to one end of the positive electrode shell 11, the annular sleeve 80 is positioned in the positive electrode shell 11, a tab clamping interval 300 is formed between the outer side wall of the annular sleeve 80 and the opening end wall of the positive electrode shell 11, and one end of the positive electrode tab 21, which extends out of the battery cell 30, is bent upwards from the lower part of the annular sleeve 80 along the outer side wall of the annular sleeve 80 into the tab clamping interval 300.
The invention only forms a molten pool and welding spots on the inner side of the cathode shell 12, thereby keeping the appearance of the cathode shell 12 complete, avoiding the risk of battery leakage caused by welding spot breakage, forming at least 1 pair of second welding spots 60 between the metal sheet 40 and the cathode shell 12, ensuring better connection stability between the metal sheet 40 and the cathode shell 12, simultaneously, ensuring more welding spots between the metal sheet 40 and the cathode shell 12, reducing the contact internal resistance between the metal sheet 40 and the cathode shell 12 and increasing the discharge efficiency of the battery; in addition, the welding quality between the cathode tab 22 and the metal sheet 40 and between the metal sheet 40 and the cathode shell 12 is conveniently detected, cold joint is avoided, in addition, one end of the anode tab 21, which extends out of the battery cell 30, is bent upwards from the lower side of the annular sleeve 80 along the outer side wall of the annular sleeve 80 and extends into the tab clamping section 300, so that one end of the anode tab 21, which extends out of the battery cell 30, is clamped in the tab clamping section 300, electric connection is realized through physical contact connection between the anode tab 21 and the opening end wall of the anode shell 11, the anode shell is kept intact, and in addition, the annular sleeve 80 also plays a role in fixing the battery cell 30.
Referring to fig. 1 to 4, the button cell without weld mark manufactured by the method for manufacturing the button cell without weld mark according to embodiment 1 comprises a positive electrode case 11, a negative electrode case 12, an insulating seal ring 70 and a battery cell 30, wherein the positive electrode case 11 and the negative electrode case 12 are cup-shaped, and the upper opening and the lower opening of the positive electrode case 11 and the lower opening of the negative electrode case 12 are opposite to each other to form a cylindrical button cell housing; a gap is reserved between the positive electrode shell 11 and the negative electrode shell 12, the gap is filled with an insulating sealing ring 70 to electrically isolate the positive electrode shell 11 from the negative electrode shell 12, and a containing cavity is formed among the positive electrode shell 11, the negative electrode shell 12 and the insulating sealing ring 70; the battery cell 30 is arranged in the accommodating cavity, the battery cell 30 is mainly formed by 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; the connection structure between the negative electrode tab 22 and the negative electrode case 12 is: one end of the negative electrode tab 22 extending out of the battery core 30 is fixedly connected with the outer surface of a metal sheet 40 through a first welding spot 50, the metal sheet 40 is horizontally and fixedly arranged on the inner surface of the negative electrode shell 12 through second welding spots 60, the number of the second welding spots 60 is more than or equal to 1 pair, the second welding spots 60 of different pairs can be overlapped, the two second welding spots 60 of the same pair are arranged in a staggered mode, and meanwhile, the first welding spot 50 and the second welding spot 60 are arranged in a staggered mode; the connection structure between the positive electrode tab 21 and the positive electrode case 11 is: the end part of the battery cell 30, which is close to one end of the positive electrode shell 11, is sleeved with a through hole-shaped annular sleeve 80, the annular sleeve 80 is positioned in the positive electrode shell 11, a tab clamping interval 300 is formed between the outer side wall of the annular sleeve 80 and the opening end wall of the positive electrode shell 11, and one end of the positive electrode tab 21, which extends out of the battery cell 30, is bent upwards from the lower part of the annular sleeve 80 along the outer side wall of the annular sleeve 30 and extends into the tab clamping interval 300.
Example 2
As shown in fig. 6, the production method of the weld mark-free button cell of example 2 is different from that of example 1 in that: step S2 of the welding method between the anode tab 22 and the anode casing 12 is continuously performed 2 times, 2 pairs of second welding spots 60 are formed between the metal sheet 40 and the anode casing 12, and two welding positions among the welding positions of the metal sheet 40 and the anode casing 12 in the different steps S2 are overlapped, and the other steps are the same as in example 1.
As shown in fig. 6, the weld mark-free button cell according to example 2 is different from the weld mark-free button cell of example 1 in that: the number of the second welding spots 60 is 2 pairs, and two second welding spots 60 among the second welding spots 60 of different pairs are overlapped, and the rest of the structure is the same as that of embodiment 1.
Example 3
As shown in fig. 7, the production method of the weld mark-free button cell of example 3 is different from that of example 1 in that: step S2 of the welding method between the negative electrode tab 22 and the negative electrode case 12 is continuously performed 3 times, 3 pairs of second welding spots 60 are formed between the metal sheet 40 and the negative electrode case 12, and in the different steps S2, there is no overlap in the welding positions of the metal sheet 40 and the negative electrode case 12, and the other steps are the same as in example 1.
As shown in fig. 7, the weld mark-free button cell according to example 3 is different from the weld mark-free button cell of example 1 in that: the number of the second welding spots 60 is 3 pairs, and the second welding spots 60 of different pairs are not overlapped, and the rest of the structure is the same as that of embodiment 1.
The button cell without welding trace in embodiment 2 and embodiment 3 only forms molten pool and welding spot on the inner side of the negative electrode shell 12, thereby keeping the appearance of the negative electrode shell 12 complete, avoiding the risk of battery leakage caused by welding spot rupture, and forming 2-3 pairs of second welding spots 60 between the metal sheet 40 and the negative electrode shell 12, and the connection stability between the metal sheet 40 and the negative electrode shell 12 is better, meanwhile, the contact internal resistance between the metal sheet 40 and the negative electrode shell 12 is small, which is beneficial to improving the discharge efficiency of the battery, and meanwhile, the appearance of the positive electrode shell 11 is kept complete, avoiding leakage, and meanwhile, the annular sleeve 80 plays a role in fixing the battery cell 30.
In general, the positive and negative electrode tabs (21, 22) are metal foils that can be bent at will.
The production method of the button cell without welding trace in examples 1 to 3 can be modified as follows:
(1) In order to make the contact between the positive electrode tab 21 and the open end wall of the positive electrode can 11 tighter, it is preferable that, after step S3, by pressing the open end wall of the positive electrode can 11 inward in the radial direction of the positive electrode can 11, a recess is formed on the open end wall of the positive electrode can 11, the recess abuts against the positive electrode tab 21 in the tab clamping section 300, and the annular sleeve 80 is further provided to protect the battery cell 30 from damage during the formation of the recess 90. Of course, the invention can also realize the electric connection between the positive electrode tab 21 and the positive electrode shell 11 only by clamping the positive electrode tab 21 in the tab clamping section 300;
(2) In step S2, the two needle electrodes (100, 200) of the resistance welding may be pressed against different positions on the outer surface of the metal sheet 40 except the welding position of the metal sheet 40 and the negative electrode tab 22, and then the metal sheet 40 may be pressed against the inner surface of the negative electrode case 12. In a specific implementation process, in step S1 of the method for producing a button cell without weld marks of the present invention, the metal sheet 40 and the negative electrode case 12 are welded by either laser welding or resistance welding.
The production method of the button cell without welding trace and the button cell without welding trace of examples 1 to 3 can be improved as follows: (1) In order to make the contact between the positive electrode tab and the open end wall of the positive electrode case tighter, it is preferable that a recessed portion 90 is provided in the open end wall of the positive electrode case so as to be recessed inward in the radial direction of the positive electrode case, and the recessed portion 90 abuts against the positive electrode tab 21 in the tab clamping section 300, as shown in fig. 4 and 5. Further preferably, as shown in fig. 4, an annular recess 90 is provided on the open end wall of the positive electrode can 11 along the circumferential direction thereof, which is convenient for manufacturing, and of course, the recess 90 may be provided only at the position of the open end wall of the positive electrode can 11 corresponding to the positive electrode tab 21;
(2) As shown in fig. 3, 6 and 7, all the second welding spots 60 are uniformly distributed around the circumference around the center of the negative electrode case 12. More preferably, as shown in fig. 3, 6 and 7, the second welding spots 60 of each pair are symmetrically distributed, so that the welding efficiency is higher and the automatic welding is more facilitated;
(3) As shown in fig. 4, 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 edge of the open end wall of the negative electrode case 12 inside, and an annular cavity is formed among the positive electrode case 11, the battery cell 30 and the insulating seal ring bending part 71; the annular sleeve 80 is embedded in the annular cavity, and an end surface of the annular sleeve 80, which is far away from the anode casing 11, is abutted against the bottom of the insulating seal ring bending part 71. This structure allows for better overall stability of the battery.
The production method of the button cell without weld mark in examples 1 to 3 is a preferred embodiment of the present invention, however, the production method of the button cell without weld mark of the present invention may be performed in the order of "step S2-step S1-step S3" or "step S3-step S1-step S2" or "step S3-step S2-step S1", wherein at least 1 pair of first welding spots 50 is formed between the negative electrode tab 22 and the metal sheet 40 by parallel welding in the order of "step S2-step S1-step S3" or "step S3-step S2-step S1".
It should be noted that, the number of repetitions of step S2 in the method for producing a button cell without solder marks according to the present invention is not limited to the specific number of repetitions in the embodiment, and the number of repetitions of step S2 may be adjusted according to the setting of the soldering position and the requirement of soldering firmness. Meanwhile, the first welding spot 50 of the present invention is not limited to 1 welding spot in the drawings, and may be 2 or more than 2 welding spots. The structure of the battery cell 30 of the present invention is not limited to the specific structure shown in the drawings, and any battery cell structure may be used.
Claims (14)
1. The button cell comprises a positive electrode shell and a negative electrode shell which are cup-shaped, wherein the positive electrode shell and the negative electrode shell can be oppositely buckled with each other through upper and lower openings to form a cylindrical button cell shell; the battery cell is packaged in the cylindrical button battery shell in a matching way, and is 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 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, and the battery cell is characterized in that the electric connection method between the positive electrode tab, the negative electrode tab and the corresponding electrode shell comprises the following steps:
s1: preparing a metal sheet, welding one end of a negative electrode tab extending out of the battery core on the metal sheet, forming a first welding spot between the negative electrode tab and the metal sheet, and then horizontally placing the metal sheet in a negative electrode shell;
s2: preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first needle electrodes, a metal sheet is propped against the inner surface of a negative electrode shell, the two first needle electrodes are respectively propped against different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and a negative electrode tab in the step S1, then the two first needle electrodes in the step are electrified to realize the fixed connection of the negative electrode shell and the metal sheet, the welding step in the step S2 is carried out for more than 1 time, at least 1 pair of second welding spots are formed between the metal sheet and the negative electrode shell, and the welding positions of the metal sheet and the negative electrode shell in the different steps S2 are overlapped or are not overlapped;
s3: the positive electrode tab and the positive electrode shell are electrically connected in the following manner: an annular sleeve in a through hole shape is sleeved outside the end part of the battery cell, which is close to one end of the positive electrode shell, the annular sleeve is positioned in the positive electrode shell, a tab clamping interval is formed between the outer side wall of the annular sleeve and the opening end wall of the positive electrode shell, and one end of the positive electrode tab, which extends out of the battery cell, is bent upwards from the lower part of the annular sleeve along the outer side wall of the annular sleeve and extends into the tab clamping interval.
2. The method for producing a button cell without weld marks according to claim 1, wherein: after step S3, a recess is formed in the positive electrode case opening end wall by pressing the positive electrode case opening end wall inward in the radial direction of the positive electrode case, the recess being in abutment with the positive electrode tab in the tab clamping section.
3. The method for producing a button cell without weld marks according to claim 1, wherein: and step S2 is continuously carried out for 2-3 times.
4. The method for producing a button cell without weld marks according to claim 1, wherein: the contact positions of the two first needle electrodes and the metal sheet in the different sub-steps S2 are not overlapped.
5. The method for producing a button cell without weld marks according to claim 1, wherein: in the step S2, the two first needle electrodes of the resistance welding are respectively propped against different positions on the outer surface of the metal sheet except the welding position of the metal sheet and the cathode tab, and then the metal sheet is propped against the inner surface of the cathode shell.
6. The method for producing a button cell without weld marks according to claim 1, wherein: in the step S1, the metal sheet and the negative electrode tab are welded by adopting any one of laser welding or resistance welding.
7. The method for producing a button cell without weld marks according to claim 1, wherein: step S3 is performed first, and then steps S1 and S2 are performed sequentially.
8. The production method of the button cell without welding marks according to any one of claims 1 to 6, wherein the production method is characterized by comprising the following steps:
the sequence of the step S1 and the step S2 is changed, and at least 1 pair of first welding spots are formed between the negative electrode tab and the metal sheet in the step S1 in a parallel welding manner.
9. A button cell without welding trace comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a cell, wherein the positive electrode shell and the negative electrode shell are cup-shaped, and the upper opening and the lower opening of the positive electrode shell and the lower opening of the negative electrode shell are oppositely buckled to form a cylindrical button cell shell; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring to electrically isolate the positive electrode shell from the negative electrode shell, and a containing cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and is mainly formed by layering or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive electrode tab, the positive electrode tab is electrically connected with a positive electrode shell, the negative plate is electrically connected with a negative electrode tab, and the negative electrode tab is electrically connected with a negative electrode shell; the lithium ion battery is characterized in that the connection structure between the negative electrode tab and the negative electrode shell is as follows: one end of the negative electrode tab, which extends out of the battery core, is fixedly connected with the outer surface of a metal sheet through a first welding spot, the metal sheet is horizontally and fixedly arranged on the inner surface of the negative electrode shell through a second welding spot, the metal sheet is welded on the negative electrode shell from the inside of the electrode shell in a parallel welding resistance welding mode, the number of the second welding spots is more than or equal to 1 pair, the second welding spots of different pairs are overlapped or not overlapped, the two second welding spots of the same pair are arranged in a staggered mode, and meanwhile, the first welding spot and the second welding spot are arranged in a staggered mode; the connection structure between the positive electrode lug and the positive electrode shell is as follows: the end part of the battery cell, which is close to one end of the positive electrode shell, is sleeved with a through-hole-shaped annular sleeve, the annular sleeve is positioned in the positive electrode shell, a tab clamping interval is formed between the outer side wall of the annular sleeve and the opening end wall of the positive electrode shell, and one end of the positive electrode tab, which extends out of the battery cell, is bent upwards from the lower part of the annular sleeve along the outer side wall of the annular sleeve and extends into the tab clamping interval.
10. The weld mark free button cell defined in claim 9, wherein: the positive electrode shell opening end wall is provided with a concave part which is concave inwards along the radial direction of the positive electrode shell, and the concave part is abutted with the positive electrode lug in the lug clamping section.
11. The weld mark free button cell defined in claim 10, wherein: and an annular concave part is arranged on the opening end wall of the positive electrode shell along the circumferential direction of the opening end wall.
12. The weld mark free button cell defined in claim 9, wherein: all the second welding spots are uniformly distributed around the circumference by taking the center of the cathode shell as the center of the circle.
13. The weld mark free button cell defined in claim 12, wherein: each pair of second welding spots is symmetrically distributed.
14. The weld mark free button cell defined in claim 9, 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 edge of 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 annular sleeve is embedded in the annular cavity, and the end face of one end of the annular sleeve, which is far away from the positive electrode shell, is abutted with the bottom of the bending part of the insulating sealing ring.
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