CN111370636A - Production method of button battery without welding trace and button battery manufactured by same - Google Patents
Production method of button battery without welding trace and button battery manufactured by same Download PDFInfo
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- CN111370636A CN111370636A CN202010390808.0A CN202010390808A CN111370636A CN 111370636 A CN111370636 A CN 111370636A CN 202010390808 A CN202010390808 A CN 202010390808A CN 111370636 A CN111370636 A CN 111370636A
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- 238000003466 welding Methods 0.000 title claims abstract description 191
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 229910052751 metal Inorganic materials 0.000 claims abstract description 90
- 239000002184 metal Substances 0.000 claims abstract description 90
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000003825 pressing Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims 1
- 229910001416 lithium ion Inorganic materials 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 description 16
- 229910000679 solder Inorganic materials 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/216—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for button or coin cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
- H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a production method of a button battery without welding traces and the button battery prepared by the same, wherein the electric connection method between a negative pole tab and a negative pole shell comprises the following steps: welding one end of a negative electrode tab extending out of the battery core on a metal sheet, and welding the metal sheet on the inner surface of the negative electrode shell in a parallel welding resistance welding mode, so that the negative electrode tab and the negative electrode shell are electrically connected; the electric connection method between the positive pole lug and the positive pole shell comprises the following steps: the end, extending out of the battery core, of the positive pole lug is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring and is arranged between the insulating sealing ring and the opening end wall of the positive pole shell in a clamping manner, so that the electric connection between the positive pole lug and the positive pole shell is realized. The button cell prepared by the invention has a smooth and complete outer surface, and can avoid electrolyte leakage, surface bulge and other phenomena.
Description
Technical Field
The invention relates to the field of button batteries, in particular to a production method of a button battery without welding traces and a button battery prepared by the same.
Background
Button cells (button cells) are also called button cells, and refer to cells with the overall dimensions like a small button, generally speaking, the button cells have a larger diameter and a thinner thickness (compared with cylindrical cells such as a cell with a size of 5 AA on the market), the button cells are classified from the aspect of the appearance, and the equivalent corresponding cells are classified into cylindrical cells, square cells, special-shaped cells and the like.
Button cells include both laminate and wound. The basic structure of the winding type button cell is as follows: the button battery comprises a first pole shell, a second pole shell, an insulating seal ring and a battery cell, wherein the upper openings and the lower openings of the first pole shell and the second pole shell are oppositely buckled to form a cylindrical button battery shell; a gap is reserved between the first pole shell and the second pole shell, the gap is filled with an insulating sealing ring to electrically isolate the first pole shell from the second pole shell, and an accommodating cavity is formed among the first pole shell, the second pole shell and the insulating sealing ring; the electric core is located the holding intracavity, electric core include first pole piece, second pole piece and diaphragm, through the diaphragm interval between first pole piece and the second pole piece, first pole piece, second pole piece and diaphragm are convoluteed and are made electric core, and the center of electric core is formed with the axial cavity, is equipped with first output conductor on the first pole piece, and first output conductor stretches out and welds with first polar shell from electric core, is equipped with second output conductor on the second pole piece, and second output conductor stretches out and welds with second polar shell from electric core. When the conventional coiled button battery is manufactured, a first output conductor of a battery core is bent to enable the first output conductor to be tightly attached to the lower surface of the battery core, and the first output conductor extends to the position right below an axial cavity; then vertically arranging the battery cell into the first pole shell; then, the welding needle is vertically inserted downwards into the axial cavity, the first output conductor is tightly pressed on the first shell, and the first output conductor and the first polar shell are welded together in an electric resistance welding mode, or the first polar shell and the first output conductor are welded together in a laser welding mode by emitting laser from the lower part of the first polar shell opposite to the area of the first polar shell, which is vertically overlapped with the first output conductor; welding a second output conductor of the battery cell on a second pole shell, wherein an insulating sealing ring is sleeved outside the second pole shell; and finally, covering the opening at the upper end of the first polar shell together with the second polar shell and the insulating sealing ring, and sealing. One of the first pole shell and the second pole shell, the corresponding output conductor and the corresponding battery cell pole piece form a battery positive pole loop of the battery, and the other pole shell, the corresponding output conductor and the corresponding battery cell pole piece form a battery negative pole loop of the battery. Because first output conductor and first utmost point shell welding time, the electric current that resistance welded and the laser beam of laser welding all can pierce through first utmost point shell, and the solder joint of connecting first utmost point shell and first output conductor runs through first utmost point shell setting, has destroyed the surface smoothness and the stability of first utmost point shell, and in the battery use, the solder joint position of first utmost point shell appears the weeping and the surface swell phenomenons such as electrolyte easily.
Disclosure of Invention
The invention aims to provide a method for producing a button cell without welding marks, which can keep the surface of an electrode shell smooth and intact, and further avoid electrolyte leakage, surface bulging and the like.
A production method of a button battery without welding marks comprises the steps that the button battery comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery cell, wherein the positive electrode shell and the negative electrode shell are both cup-shaped, and the positive electrode shell and the negative electrode shell can be oppositely buckled with an upper opening and a lower opening to form a cylindrical button battery shell; the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, the opening end wall of the positive electrode shell is positioned on the inner side of the opening end wall of the negative electrode shell, a gap is reserved between the opening end wall of the positive electrode shell and the opening end wall of the negative electrode shell, the insulating sealing ring is filled in the gap to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the electric core is located the holding intracavity, electric core mainly by positive plate, negative pole piece, the range upon range of or convolute and form, positive plate and a positive pole utmost point ear electricity are connected, positive pole utmost point ear is connected with anodal shell electricity again, negative pole piece and a negative pole utmost point ear electricity are connected, negative pole utmost point ear is connected with negative pole shell electricity again, just, negative pole utmost point ear and correspond the electric connection method between the polar shell and include following step:
s1: preparing a metal sheet, welding one end of a negative pole lug extending out of the battery core on the metal sheet, forming a first welding point between the negative pole lug and the metal sheet, and horizontally placing the metal sheet in a negative pole shell;
s2: preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first welding electrodes, pressing a metal sheet on the inner surface of a negative electrode shell, respectively pressing the two first welding electrodes on different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and a negative electrode lug in the step S1, and then electrifying the two first welding electrodes in the step 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 points 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 step S2 in different times can be overlapped;
s3: the positive pole lug is electrically connected with the positive pole shell in the following mode: and one end of the positive electrode lug, which extends out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring and is clamped between the insulating sealing ring and the opening end wall of the positive electrode shell.
In the welding method between the negative pole tab and the negative pole shell, one end of the negative pole tab extending out of the battery core is welded on the metal sheet before the metal sheet is arranged in the negative pole shell, the metal sheet is welded on the negative pole shell from the inside of the pole shell in a parallel welding resistance welding mode after the metal sheet is arranged in the negative pole shell, two first welding electrodes of resistance welding are limited to respectively carry out welding operation on the outer surface of the metal sheet outside the welding position of the metal sheet and the negative pole tab, when the two first welding electrodes are electrified, an annular welding current channel can be formed between the two first welding electrodes, the welding current can not penetrate through the negative pole shell, so that a molten pool and a welding spot can be formed only on the inner side of the negative pole shell, the appearance integrity of the negative pole shell is kept, the risk of battery leakage caused by the breakage of the welding spot is avoided, and at least 1 pair of second welding spots is formed between the metal sheet and, the connection stability between the metal sheet and the negative electrode shell is better, meanwhile, the number of welding points between the metal sheet and the negative electrode shell is large, and the internal resistance of the welding position between the negative electrode shell and the metal sheet is usually smaller than the internal resistance of the physical contact position between the negative electrode shell and the metal sheet, so that the overall contact internal resistance between the negative electrode shell and the metal sheet is smaller, and the smaller the contact internal resistance is, the more beneficial to battery discharge is achieved; in addition, the welding quality between the negative pole tab and the negative pole shell is conveniently detected, and the insufficient welding is avoided; and one end of the positive electrode tab, which extends out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring, clamped between the insulating sealing ring and the opening end wall of the positive electrode shell, and is electrically connected 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 can tighter, it is preferable that after step S3, a recess is formed on the open end wall of the positive electrode can by pressing the open end wall of the positive electrode can radially inward, the recess abutting against the positive electrode tab between the insulating seal ring and the open end wall of the positive electrode can, in this case, also protect the battery cell from damage during formation of the recess.
Preferably, step S2 is performed continuously for 1-3 times, so as to form 1-3 pairs of second welding points between the metal sheet and the negative electrode casing, thereby reducing the operation cost and improving the working efficiency as much as possible while ensuring that the metal sheet and the negative electrode casing are reliably welded together.
Preferably, the contact positions of the two first welding electrodes and the metal sheet in the step S2 in different times are not overlapped, so as to avoid that the molten pool is enlarged when the second welding points in the step S2 in different times are overlapped, which causes the welding electrodes and the metal sheet to be bonded together and brings the trouble of needle poking.
In a specific implementation process, in step S2, the two first welding electrodes of the resistance welding may be pressed against different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and the negative electrode tab, and then the metal sheet may be pressed against the inner surface of the negative electrode casing.
In a specific implementation process, in step S1, any one of laser welding and resistance welding is used to weld the metal sheet and the negative electrode tab.
In the specific implementation process, step S3 may be performed first, and then steps S1 and S2 are performed in sequence.
The sequence of steps S1 and S2 can be changed regardless of whether step S3 is performed first, then steps S1 and S2 are performed, or steps S1 and S2 are performed first, then step S3 is performed, and at least 1 pair of first welding points are formed between the negative electrode tab and the metal piece by resistance welding in parallel welding in step S1.
The invention also aims to provide a button battery without welding traces, 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 both cup-shaped, and the upper openings and the lower openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, and the opening end wall of the positive electrode shell is positioned on the inner side of the opening end wall of the negative electrode shell; a gap is reserved between the opening end wall of the positive electrode shell and the opening end wall of the negative electrode shell, the insulating sealing ring is filled in the gap to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive pole lug, the positive pole lug is further electrically connected with the positive shell, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is further electrically connected with the negative shell; the connection structure between the negative pole tab and the negative pole shell is as follows: one end of the negative electrode lug, which extends out of the battery core, is fixedly connected with the outer surface of a metal sheet through a first welding point, the inner surface of the negative electrode shell is horizontally and fixedly provided with the metal sheet through second welding points, the number of the second welding points is more than or equal to 1 pair, different pairs of second welding points can be overlapped, two second welding points of the same pair are arranged in a staggered manner, and meanwhile, the first welding point and the second welding points are arranged in a staggered manner; the connection structure between the positive pole lug and the positive pole shell is as follows: and one end of the positive electrode lug, which extends out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring and is clamped between the insulating sealing ring and the opening end wall of the positive electrode shell.
In the welding structure between the negative pole lug and the negative pole shell in the button cell, the first welding point and the second welding point are both positioned on the inner side of the pole shell, the outer surface of the negative pole shell is kept flat and intact, the number of the second welding points between the metal sheet and the negative pole shell is large, the connection between the negative pole shell and the metal sheet is firmer, the contact internal resistance is smaller, meanwhile, the number of the third welding points between the negative pole lug and the negative pole shell is large, the connection between the negative pole lug and the negative pole shell is firmer, the contact internal resistance is small, and the contact internal resistance is small, so that the discharge efficiency of the cell is improved; meanwhile, one end of the positive pole lug, extending out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring, and the positive pole lug is in physical contact connection with the opening end wall of the positive pole shell to realize electric connection, so that the positive pole shell is kept intact.
In order to make the contact between the positive electrode tab and the opening end wall of the positive electrode casing tighter, it is preferable that a recessed portion recessed inward in the radial direction of the positive electrode casing is provided on the opening end wall of the positive electrode casing, and the recessed portion abuts against the positive electrode tab between the insulating seal ring and the opening end wall of the positive electrode casing. Further preferably, the annular concave part is arranged on the opening end wall of the positive electrode shell along the circumferential direction of the opening end wall, so that the manufacturing is convenient.
Preferably, all the second welding points are uniformly distributed around the circumference by taking the center of the cathode shell as a circle center. More preferably, the second welding points of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is more facilitated.
Preferably, the lower end of the insulating sealing ring extends inwards to form a bending part, and the bending part wraps the edge of the end wall of the opening of the negative electrode shell, so that the insulating sealing ring is convenient to mount. Further, the bottom of the kink of insulating seal circle and anodal utmost point ear butt for anodal utmost point ear is pressed and is supported on the internal surface of anodal shell, thereby improves the structural stability of anodal utmost point ear and the contact stability between anodal utmost point ear and the anodal shell.
Drawings
Fig. 1 is a schematic view of a welding structure of a negative electrode tab and a metal sheet in any one of embodiments 1 to 3, wherein the metal sheet is a cross-sectional structural view;
fig. 2 is a schematic view of a welding structure of the negative electrode case and the metal sheet according to any one of embodiments 1 to 3, wherein both the negative electrode case and the metal sheet are cross-sectional structural diagrams;
fig. 3 is a top view structural view of a negative electrode can in example 1;
FIG. 4 is a schematic cross-sectional view of a button cell without any welding trace in any of embodiments 1-3;
FIG. 5 is an enlarged view of portion A of FIG. 4;
fig. 6 is a top view structural view of a negative electrode can in example 2;
fig. 7 is a top view structural view of a negative electrode can in example 3;
wherein the dashed circles 60 in fig. 3, 6 and 7 indicate the location of the second welding points.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings:
example 1
With reference to fig. 1 to 4, a method for producing a button battery without welding marks includes a positive electrode shell 11, a negative electrode shell 12, an insulating seal ring 70 and a battery cell 30, where the positive electrode shell 11 and the negative electrode shell 12 are both 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 battery case; the positive electrode shell 11 and the negative electrode shell 12 are partially overlapped in the vertical direction, the opening end wall 111 of the positive electrode shell 11 is positioned on the inner side of the opening end wall 121 of the negative electrode shell 12, a gap is reserved between the opening end wall 111 of the positive electrode shell 11 and the opening end wall 121 of the negative electrode shell 12, the insulating sealing ring 70 is filled in the gap to electrically isolate the positive electrode shell 11 from the negative electrode shell 12, and an accommodating cavity is formed among the positive electrode shell 11, the negative electrode shell 12 and the insulating sealing ring 70; the battery cell 30 is arranged in the accommodating cavity, the battery cell 30 is mainly formed by laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate 31 is electrically connected with a positive pole tab 21, the positive pole tab 21 is electrically connected with the positive shell 11, the negative plate 32 is electrically connected with a negative pole tab 22, the negative pole tab 22 is electrically connected with the negative shell 12, and the electrical connection method between the positive pole tab (21), the negative pole tab (22) and the corresponding pole 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 core 30 on the metal sheet 40, forming a first welding point 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 against the inner surface of the negative electrode casing 11 to prepare a first resistance welding device, wherein the first resistance welding device comprises two first welding electrodes (100 and 200), respectively pressing the two first welding electrodes (100 and 200) against 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 step S1, and then energizing the two first welding electrodes (100 and 200) in the step to fixedly connect the negative electrode casing 12 and the metal sheet 40, wherein the welding step in step S2 is performed for 1 or more times, at least 1 pair of second welding points 60 are formed between the metal sheet 40 and the negative electrode casing 11, and the welding positions of the metal sheet 40 and the negative electrode casing 11 in step S2 in different times can be overlapped;
step S2 is performed only once, and the number of the second welding spots 60 is 1 pair;
and S3, the positive electrode tab 21 and the positive electrode shell 11 are electrically connected in the following way: one end of the positive electrode tab 21 extending out of the battery cell 30 is bent upward from the lower side of the insulating seal ring 70 along the outer side wall of the insulating seal ring 70, and is clamped between the insulating seal ring 70 and the opening end wall 111 of the positive electrode shell 11.
According to the invention, only a molten pool and welding spots are formed on the inner side of the negative electrode shell 12, so that the complete appearance of the negative electrode shell 12 is maintained, the risk of battery leakage caused by welding spot fracture is avoided, at least 1 pair of second welding spots 60 are formed between the metal sheet 40 and the negative electrode shell 12, the connection stability between the metal sheet 40 and the negative electrode shell 12 is better, meanwhile, the number of welding spots between the metal sheet 40 and the negative electrode shell 12 is large, the contact internal resistance between the metal sheet 40 and the negative electrode shell 12 can be reduced, and the discharge efficiency of the battery is increased; in addition, the welding quality between the negative electrode tab 22 and the metal sheet 40 and between the metal sheet 40 and the negative electrode shell 12 can be conveniently detected, and the cold joint can be avoided, in addition, one end of the positive electrode tab 21 extending out of the battery cell 30 is bent upwards from the lower part of the insulating sealing ring 70 along the outer side wall of the insulating sealing ring 70, and is clamped and arranged between the insulating sealing ring 70 and the opening end wall 111 of the positive electrode shell, the electric connection can be realized through the physical contact connection between the positive electrode tab 21 and the opening end wall 111 of the positive electrode shell 11, and the positive electrode shell can be kept intact.
With reference to fig. 1 to 4, the button cell without welding marks manufactured by the method for manufacturing a button cell without welding marks according to embodiment 1 includes 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 both cup-shaped, and the upper and lower openings of the positive electrode case 11 and the negative electrode case 12 are oppositely buckled to form a cylindrical button cell case; the positive electrode can 11 and the negative electrode can 12 are partially overlapped in the vertical direction, the opening end wall 111 of the positive electrode can 11 is positioned at the inner side of the opening end wall 112 of the negative electrode can 12, a gap is left between the opening end wall 111 of the positive electrode can 11 and the opening end wall 121 of the negative electrode can 12, and the insulating sealing ring 70 fills the gap to electrically isolate the positive electrode can 11 from the negative electrode can 12; an accommodating cavity is formed among the positive electrode shell 11, the negative electrode shell 12 and the insulating sealing ring 70; the battery cell 30 is arranged in the accommodating cavity, the battery cell 30 is mainly formed by laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate 31 is electrically connected with a positive pole tab 21, the positive pole tab 21 is electrically connected with the positive shell 11, the negative plate 32 is electrically connected with a negative pole tab 22, and the negative pole tab 22 is electrically connected with the negative shell 12; the connection structure between the negative electrode tab 22 and the negative electrode case 12 is: one end of the negative electrode tab 22, which extends out of the battery cell 30, is fixedly connected with the outer surface of a metal sheet 40 through a first welding point 50, the metal sheet 40 is horizontally and fixedly arranged on the inner surface of the negative electrode shell 12 through second welding points 60, the number of the second welding points 60 is not less than 1 pair, different pairs of the second welding points 60 can be overlapped, two second welding points 60 of the same pair are arranged in a staggered manner, and meanwhile, the first welding points 50 and the second welding points 60 are arranged in a staggered manner; the connection structure between the positive electrode tab 21 and the positive electrode shell 11 is as follows: one end of the positive electrode tab 21 extending out of the battery cell 30 is bent upward from the lower side of the insulating seal ring 70 along the outer side wall of the insulating seal ring 70, and is clamped between the insulating seal ring 70 and the opening end wall 111 of the positive electrode shell 11.
Example 2
As shown in fig. 6, the method for producing the button cell without welding marks of example 2 is different from the method for producing the button cell without welding marks of example 1 in that: the welding method between the negative electrode tab 22 and the negative electrode can 12 is performed 2 times continuously in step S2, 2 pairs of second welding points 60 are formed between the metal sheet 40 and the negative electrode can 12, and two welding positions of the metal sheet 40 and the negative electrode can 12 are overlapped in step S2, and the rest steps are the same as those of embodiment 1.
As shown in fig. 6, the button cell without welding marks according to example 2 is different from the button cell without welding marks of example 1 in that: the number of the second pads 60 is 2 pairs, and two of the second pads 60 of different pairs overlap, and the rest of the structure is the same as that of embodiment 1.
Example 3
As shown in fig. 7, the method for producing the button cell without welding marks of example 3 is different from the method for producing the button cell without welding marks of example 1 in that: in the welding method between the negative electrode tab 22 and the negative electrode can 12, step S2 is continuously performed 3 times, 3 pairs of second welding points 60 are formed between the metal sheet 40 and the negative electrode can 12, and in step S2, there is no overlapping between the welding positions of the metal sheet 40 and the negative electrode can 12, and the rest steps are the same as those in example 1.
As shown in fig. 7, the button cell without welding marks according to example 3 is different from the button cell without welding marks of example 1 in that: the number of the second welding points 60 is 3 pairs, and the second welding points 60 of different pairs are not overlapped, and the rest of the structure is the same as that of the embodiment 1.
The button cell without welding traces of the embodiment 2 and the embodiment 3 only forms a molten pool and a welding spot on the inner side of the negative electrode shell 12, so that the appearance of the negative electrode shell 12 is kept complete, the risk of battery leakage caused by welding spot breakage is avoided, 2-3 pairs of second welding spots 60 are formed between the metal sheet 40 and the negative electrode shell 12, 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, the improvement of the discharge efficiency of the cell is facilitated, meanwhile, the appearance of the positive electrode shell 11 can be kept complete, and leakage is avoided.
Generally, the positive and negative electrode tabs (21, 22) are both metal foils that can be bent at will.
The production method of the button cell without the welding trace in the embodiments 1 to 3 can be improved as follows:
(1) in order to make the contact between positive electrode tab 21 and open end wall 111 of positive electrode can 11 even tighter, it is preferable that, after step S3, recess 80 be formed in open end wall 111 of positive electrode can 11 by pressing open end wall 111 of positive electrode can 11 radially inward, this recess 80 abutting against positive electrode tab 21 clampingly disposed between insulating seal ring 70 and open end wall 111 of positive electrode can 11. Of course, the present invention may also realize the electrical connection between the positive electrode tab 21 and the positive electrode shell 11 by only clamping the positive electrode tab 21 between the insulating sealing ring 70 and the opening end wall 111 of the positive electrode shell 11;
(2) in step S2, the two welding electrodes (100, 200) of resistance welding may be pressed against 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, 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 a welding mark, any welding method of laser welding or resistance welding is adopted between the metal sheet 40 and the negative electrode can 12.
The production method of the button cell without welding marks of the embodiments 1-3 and the button cell without welding marks can be improved as follows: (1) in order to make the contact between the positive electrode tab 21 and the open end wall 111 of the positive electrode can 11 more intimate, it is preferable that, in conjunction with fig. 4 and 5, the open end wall 111 of the positive electrode can be provided with a recessed portion 80 recessed inward in the radial direction of the positive electrode can 11, the recessed portion 80 abutting against the positive electrode tab 21 clamped between the insulating seal ring 70 and the open end wall of the positive electrode can 11. Further preferably, as shown in fig. 4, the opening end wall 111 of the positive electrode can 11 is provided with an annular recess 80 along the circumferential direction thereof, which is convenient for manufacturing, but of course, the recess 80 may be provided only at the position of the opening end wall 111 of the positive electrode can 11 where the positive electrode tab 21 and the insulating seal ring correspond to each other;
(2) as shown in fig. 3, 6, and 7, all the second welding points 60 are uniformly distributed around the circumference around the center of the negative electrode can 12. More preferably, as shown in fig. 3, 6, and 7, the second welding points 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 lower end of the insulating sealing ring 70 extends inward to form a bent portion 71, and the bent portion 71 wraps the edge of the open end wall 121 of the negative electrode can 12 therein to facilitate the installation of the insulating sealing ring 70. Further, the bottom of the bent portion 710 of the insulating sealing ring 70 abuts against the positive electrode tab 21, so that the positive electrode tab is pressed against the inner surface of the positive electrode shell, thereby improving the structural stability of the positive electrode tab 21 and the contact stability between the positive electrode tab 21 and the positive electrode shell 11.
The method for producing the button cell without welding marks in examples 1 to 3 is a preferred embodiment of the present invention, but the method for producing the button cell without welding marks of the present invention may be performed in the sequence of "step S2-step S1-step S3" or "step S3-step S1-step S2" or "step S3-step S2-step S1" or other steps, wherein when the sequence of "step S2-step S1-step S3" or step S3-step S2-step S1 "is performed, at least 1 pair of first welding points 50 are formed between the negative electrode tab 22 and the metal sheet 40 by resistance welding of parallel welding in step S1.
It should be noted that the number of times of repeating step S2 in the method for producing a button cell without welding marks is not limited to the specific number of times in the embodiment, and the number of times of repeating step S2 may be adjusted according to the setting of the welding position and the requirement of welding firmness. Meanwhile, the first solder joint 50 of the present invention is not limited to 1 solder joint in the drawings, and may be 2 or more than 2 solder joints. The structure of the battery cell 30 of the present invention is not limited to the specific structure shown in the drawings, and may be any battery cell structure.
Claims (15)
1. A production method of a button battery without welding marks comprises the steps that the button battery comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery cell, wherein the positive electrode shell and the negative electrode shell are both cup-shaped, and the positive electrode shell and the negative electrode shell can be oppositely buckled with an upper opening and a lower opening to form a cylindrical button battery shell; the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, the opening end wall of the positive electrode shell is positioned on the inner side of the opening end wall of the negative electrode shell, a gap is reserved between the opening end wall of the positive electrode shell and the opening end wall of the negative electrode shell, the insulating sealing ring is filled in the gap to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the electric core is located the holding intracavity, electric core mainly by positive plate, negative pole piece, the range upon range of or convolute and form, positive plate and a positive pole utmost point ear electricity are connected, positive pole utmost point ear is connected with anodal shell electricity again, the negative pole piece is connected with a negative pole utmost point ear electricity, negative pole utmost point ear is connected with negative pole shell electricity again, its characterized in that, just, the electric connection method between negative pole utmost point ear and the corresponding polar shell includes following step:
s1: preparing a metal sheet, welding one end of a negative pole lug extending out of the battery core on the metal sheet, forming a first welding point between the negative pole lug and the metal sheet, and horizontally placing the metal sheet in a negative pole shell;
s2: preparing first resistance welding equipment, wherein the first resistance welding equipment comprises two first welding electrodes, pressing a metal sheet on the inner surface of a negative electrode shell, respectively pressing the two first welding electrodes on different positions on the outer surface of the metal sheet except for the welding position of the metal sheet and a negative electrode lug in the step S1, and then electrifying the two first welding electrodes in the step 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 points 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 step S2 in different times can be overlapped;
s3: the positive pole lug is electrically connected with the positive pole shell in the following mode: and one end of the positive electrode lug, which extends out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring and is clamped between the insulating sealing ring and the opening end wall of the positive electrode shell.
2. The method for producing a button cell without welding marks according to claim 1, wherein the method comprises the following steps: after step S3, a recess is formed in the open end wall of the positive electrode can by pressing the open end wall of the positive electrode can radially inward of the positive electrode can, the recess abutting a positive electrode tab located between the insulating seal ring and the open end wall of the positive electrode can.
3. The method for producing a button cell without welding marks according to claim 1, wherein the method comprises the following steps: step S2 is continuously performed for 1-3 times.
4. The method for producing a button cell without welding marks according to claim 1, wherein the method comprises the following steps: the contact positions of the two first welding electrodes and the metal sheet in different sub-steps S2 are not overlapped.
5. The method for producing a button cell without welding marks according to claim 1, wherein the method comprises the following steps: in step S2, the two first welding electrodes of resistance welding are 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 is pressed against the inner surface of the negative electrode case.
6. The method for producing a button cell without welding marks according to claim 1, wherein the method comprises the following steps: in step S1, any one of laser welding and resistance welding is used between the metal sheet and the negative electrode tab.
7. The method for producing a button cell without welding marks according to claim 1, wherein the method comprises the following steps: step S3 is performed first, and then steps S1 and S2 are performed in this order.
8. The method for producing a button cell without welding marks according to claims 1 to 7, wherein the method comprises the following steps: the sequence of the step S1 and the step S2 is changed, and at least 1 pair of first welding points are formed between the negative electrode tab and the metal sheet in the step S1 by resistance welding of parallel welding.
9. A button battery without welding traces comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery cell, wherein the positive electrode shell and the negative electrode shell are both cup-shaped, and the upper openings and the lower openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, and the opening end wall of the positive electrode shell is positioned on the inner side of the opening end wall of the negative electrode shell; a gap is reserved between the opening end wall of the positive electrode shell and the opening end wall of the negative electrode shell, the insulating sealing ring is filled in the gap to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive pole lug, the positive pole lug is further electrically connected with the positive shell, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is further electrically connected with the negative shell; the lithium ion battery is characterized in that the connection structure between the negative pole lug and the negative pole shell is as follows: one end of the negative electrode lug, which extends out of the battery core, is fixedly connected with the outer surface of a metal sheet through a first welding point, the inner surface of the negative electrode shell is horizontally and fixedly provided with the metal sheet through second welding points, the number of the second welding points is more than or equal to 1 pair, different pairs of second welding points can be overlapped, two second welding points of the same pair are arranged in a staggered manner, and meanwhile, the first welding point and the second welding points are arranged in a staggered manner; the connection structure between the positive pole lug and the positive pole shell is as follows: and one end of the positive electrode lug, which extends out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring and is clamped between the insulating sealing ring and the opening end wall of the positive electrode shell.
10. The button cell without welding marks as set forth in claim 9, wherein: the end wall of the opening of the positive electrode shell is provided with a sunken part which is sunken inwards along the radial direction of the positive electrode shell, and the sunken part is abutted with a positive electrode lug between the insulating sealing ring and the end wall of the opening of the positive electrode shell.
11. The button cell without welding marks as set forth 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 button cell without welding marks as set forth in claim 9, wherein: all the second welding points are uniformly distributed around the circumference by taking the center of the cathode shell as a circle center.
13. The button cell without welding marks as set forth in claim 12, wherein: the second welding points of each pair are symmetrically distributed.
14. The button cell without welding marks as set forth in claim 9, wherein: the lower end of the insulating sealing ring extends inwards to form a bending part, and the bending part wraps the edge of the end wall of the opening of the negative electrode shell.
15. The button cell without any welding marks as set forth in claim 14, wherein: and the bottom of the bent part of the insulating sealing ring is abutted with the positive pole lug.
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| WO2022060136A1 (en) * | 2020-09-18 | 2022-03-24 | 주식회사 엘지에너지솔루션 | Button-type secondary battery |
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| WO2023184239A1 (en) * | 2022-03-30 | 2023-10-05 | 东莞新能源科技有限公司 | Battery and electric device |
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