CN111370637A - 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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- CN111370637A CN111370637A CN202010390980.6A CN202010390980A CN111370637A CN 111370637 A CN111370637 A CN 111370637A CN 202010390980 A CN202010390980 A CN 202010390980A CN 111370637 A CN111370637 A CN 111370637A
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- 238000003466 welding Methods 0.000 title claims abstract description 200
- 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
- 238000007789 sealing Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 21
- 229910000679 solder Inorganic materials 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 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
- 210000001503 joint Anatomy 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000011888 foil Substances 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
-
- 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 aims to provide a production method of a button battery without welding traces and the button battery prepared by the same, wherein the welding mode between a negative electrode tab and a negative electrode shell is as follows: welding one end of the 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 as to realize the welding fixation between the negative electrode tab and the negative electrode shell; the welding mode between the positive pole lug and the positive pole shell is as follows: the electric core is provided with a through hole-shaped annular conductive sleeve in the end part outer sleeve close to one end of the positive electrode shell, the end part edge of the annular conductive sleeve close to one end of the positive electrode shell is connected with the direct physical contact of the inner surface of the positive electrode shell, and a notch is arranged on the end part edge, one end of the positive electrode lug, stretching out of the electric core, is bent along the outer side wall of the annular conductive sleeve after passing through the notch of the annular conductive sleeve and is welded with the outer side wall of the annular conductive sleeve, so that the welding fixation between the positive electrode lug and the positive electrode shell is realized.
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 and a negative electrode shell, 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 each other through upper and lower openings to form a cylindrical button battery shell; an electric core is matched and packaged in the cylindrical button battery shell, the electric core 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 pole lug, the positive pole lug is welded with a positive shell to realize electric connection, the negative plate is electrically connected with a negative pole lug, the negative pole lug is welded with a negative shell to realize electric connection, and the welding method between the positive pole lug and the negative pole lug and the corresponding pole shell comprises the following steps:
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 needle-shaped electrodes, pressing a metal sheet on the inner surface of a negative electrode shell, respectively pressing the two first needle-shaped 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 needle-shaped 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 welding between the positive pole lug and the positive pole shell is realized in the following mode: the electric core is provided with a through hole-shaped annular conductive sleeve at the end part outer sleeve close to one end of the positive electrode shell, the end part edge of the annular conductive sleeve close to one end of the positive electrode shell is connected with the direct physical contact of the inner surface of the positive electrode shell, a notch is arranged at the end part edge, one end of the positive electrode lug, stretching out of the electric core, is bent along the outer side wall of the annular conductive sleeve after passing through the notch of the annular conductive sleeve and is welded with the outer side wall of the annular conductive sleeve, and a third welding spot is formed between the positive electrode lug and the outer side wall of the annular conductive sleeve.
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 in a parallel welding resistance welding mode after the metal sheet is arranged in the negative pole shell, two first needle-shaped electrodes of resistance welding are limited to be respectively welded 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 needle-shaped electrodes are electrified, an annular welding current channel can be formed between the two first needle-shaped 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 are formed between the metal sheet and the negative pole, 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 the one end of the positive pole lug that stretches out of the electric core is welded on the outer side wall of the annular conductive sleeve, and then the annular conductive sleeve is in physical contact connection with the inner surface of the positive pole shell, so that the electric connection between the positive pole lug and the positive pole shell is indirectly realized, the positive pole shell is kept intact, and meanwhile, the arrangement of the notch on the edge of the annular conductive sleeve can ensure the good contact between the annular conductive sleeve and the inner surface of the positive pole shell and avoid the annular conductive sleeve from breaking the positive pole lug.
In a specific implementation process, in step S3, the end of the positive tab extending out of the battery core may also pass through the notch of the annular conductive sleeve and then be bent along the inner sidewall of the positive shell and welded to the inner sidewall of the positive shell in a parallel resistance welding manner, and a fourth welding point is formed between the positive tab and the inner sidewall of the positive shell.
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 needle electrodes and the metal sheet in the step S2 in different times are not overlapped, so as to avoid that when the second welding points in the step S2 in different times are overlapped, the molten pool is enlarged, and the needle electrodes and the metal sheet are bonded together, which brings about the trouble of needle poking.
In a specific implementation process, in step S2, the two first needle electrodes in 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; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive pole lug, the positive pole lug is further electrically connected with the positive shell, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is further electrically connected with the negative shell; 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: the tip overcoat that is close to positive pole shell one end of electric core is equipped with the annular conductive sleeve of a through-hole form, and the annular conductive sleeve be close to positive pole shell one end border and be connected with the direct physical contact of internal surface of positive pole shell, and seted up the breach on this annular conductive sleeve border, the one end of stretching out of electric core of anodal utmost point ear is passed the back by annular conductive sleeve's breach and is buckled along annular conductive sleeve's lateral wall and weld with annular conductive sleeve's lateral wall, is formed with the third solder joint between anodal utmost point ear and the annular conductive sleeve's the lateral wall.
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 anode tab, extending out of the battery core, is welded on the outer side wall of the annular conductive sleeve, and then the annular conductive sleeve is in physical contact connection with the inner surface of the anode shell, so that the anode tab and the anode shell are indirectly electrically connected, the anode shell is kept intact, and meanwhile, due to the arrangement of the notch in the edge of the annular conductive sleeve, good contact between the annular conductive sleeve and the inner surface of the anode shell can be ensured, and the annular conductive sleeve is prevented from breaking the anode tab.
One end of the positive electrode tab of the button battery without the welding trace, which extends out of the battery core, can also pass through the gap of the annular conductive sleeve and then be bent along the inner side wall of the positive electrode shell and welded with the inner side wall of the positive electrode shell, and at least 1 pair of fourth welding spots are formed between the positive electrode tab and the inner side wall of the positive electrode shell.
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 positive and negative electrode shells are partially overlapped in the vertical direction, the opening end wall of the negative electrode shell is positioned on the inner side of the opening end wall of the positive electrode shell, a gap is reserved between the opening end wall of the negative electrode shell and the opening end wall of the positive electrode shell, the insulating sealing ring is clamped in the gap, the lower end of the insulating sealing ring extends inwards to form a bending part, the 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 battery core and the bending part of the insulating sealing ring; the annular conductive sleeve is embedded in the annular cavity, and the end face of one end, far away from the positive electrode shell, of the annular conductive sleeve is abutted to the bottom of the bending part of the insulating sealing ring. This structure makes the overall stability of the battery better. Furthermore, an annular folding edge extends outwards from the end part of one end, far away from the positive electrode shell, of the annular conductive sleeve. The arrangement of the annular folding edge increases the butt joint surface between the end face of the end of the annular conductive sleeve and the insulating seal ring, and the sealing performance of the package is greatly improved.
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 weld marks according to any one of embodiment 1 and embodiment 2;
FIG. 5 is a right side view of the annular conductive sleeve according to any one of embodiments 1 to 3;
fig. 6 is a top view structural view of a negative electrode can in example 2;
FIG. 7 is a schematic cross-sectional view of a button cell according to example 3, the button cell having no weld mark; wherein the dotted circle 60 in fig. 4, 6, 7 indicates the location of the second weld point;
fig. 8 is a plan view structural view of the negative electrode case in example 3.
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 5, a method for producing a button cell without welding marks comprises a positive electrode shell 11 and a negative electrode shell 12, wherein 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 an upper opening and a lower opening to form a cylindrical button cell shell; an electric core 30 is matched and packaged in the cylindrical button battery shell, the electric core 30 is mainly formed by laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate 31 is electrically connected with a positive pole tab 21, the positive pole tab 21 is welded with the positive shell 11 to realize the electrical connection, the negative plate 32 is electrically connected with a negative pole tab 22, the negative pole tab 22 is welded with the negative shell 12 to realize the electrical connection, wherein the welding method between the positive pole tab (21; 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 shell 11 to prepare a first resistance welding device, wherein the first resistance welding device comprises two first needle electrodes (100 and 200), respectively pressing the two first needle electrodes (100 and 200) at 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 electrifying the two first needle electrodes (100 and 200) in the step to fixedly connect the negative electrode shell 12 and the metal sheet 40, wherein the welding step in step S2 is carried out for 1 time or more, at least 1 pair of second welding points 60 are formed between the metal sheet 40 and the negative electrode shell 11, and the welding positions of the metal sheet 40 and the negative electrode shell 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, welding the positive electrode tab 21 and the positive electrode shell 11 in the following way: the annular conductive sleeve 80 of a through hole form is established to the tip overcoat that is close to positive shell 11 one end at electric core 30, and the direct physical contact of the internal surface that is close to positive shell 11 one end border and positive shell 11 of annular conductive sleeve 80 is connected, and has seted up breach 81 on this annular conductive sleeve 80 border, the one end of stretching out electric core 30 of anodal utmost point ear 11 is passed back along the lateral wall of annular conductive sleeve 80 and is buckled and with the lateral wall welding of annular conductive sleeve 80 by the breach 81 of annular conductive sleeve 80, forms third solder joint 91 between the lateral wall of anodal utmost point ear 21 and annular conductive sleeve 80.
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, the indirect welding between the positive electrode tab 21 and the positive electrode shell 11 can be realized through the annular conductive sleeve 80, and no welding spot can be generated on the positive electrode shell 11, so that the positive electrode shell 11 can be ensured to be intact, in addition, the arrangement of the notch 81 on the edge of the annular conductive sleeve 80 can ensure the good contact between the annular conductive sleeve 80 and the inner surface of the positive electrode shell 11, and the positive electrode tab 21 can be prevented from being broken by the fastening force of the annular conductive sleeve 80.
With reference to fig. 1 to 5, 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; a gap is reserved between the positive electrode shell 11 and the negative electrode shell 12, the insulating sealing ring 70 is filled in the gap to electrically isolate the positive electrode shell 11 from the negative electrode shell 12, and an accommodating cavity is formed among the positive electrode shell 11, the negative electrode shell 12 and the insulating sealing ring 70; the battery cell 30 is arranged in the accommodating cavity, the battery cell 30 is mainly formed by laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate 31 is electrically connected with a positive pole tab 21, the positive pole tab 21 is electrically connected with the positive shell 11, the negative plate 32 is electrically connected with a negative pole tab 22, and the negative pole tab 22 is electrically connected with the negative shell 12; 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: the tip overcoat that is close to positive shell 11 one end of electric core 30 is equipped with the annular conductive sleeve 80 of a through-hole form, and the direct physical contact of internal surface that is close to positive shell 11 one end border and positive shell 11 of annular conductive sleeve 80 is connected, and has seted up breach 81 on this annular conductive sleeve 80 border, the one end that stretches out electric core 30 of anodal utmost point ear 21 is passed back along the lateral wall of annular conductive sleeve 80 and is buckled and with the lateral wall welding of annular conductive sleeve 80 by the breach 81 of annular conductive sleeve 80, is formed with third solder joint 91 between the lateral wall of anodal utmost point ear 21 and annular conductive sleeve 80.
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
With reference to fig. 7 and 8, 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 casing 12, step S2 is continuously performed for 3 times, 3 pairs of second welding points 60 are formed between the metal sheet 40 and the negative electrode casing 12, and in step S2, there is no overlap between the welding positions of the metal sheet 40 and the negative electrode casing 12; in the welding method between the positive electrode tab 21 and the positive electrode can 11, the end of the positive electrode tab 21 extending out of the battery core 30 may also pass through the notch 81 of the annular conductive sleeve 80 and then be bent along the inner side wall of the positive electrode can 11, and be welded to the inner side wall of the positive electrode can 11 by resistance welding in parallel welding, a fourth welding point 92 is formed between the positive electrode tab 21 and the inner side wall of the positive electrode can 11, and the rest steps are the same as those in embodiment 1.
With reference to fig. 7 and 8, 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 quantity of second solder joint 60 is 3 pairs, and different second solder joints 60 of pair do not all overlap, the one end of stretching out electric core 30 of anodal utmost point ear 21 also can pass the back along the inside wall of anodal shell 11 by breach 81 of annular conductive sleeve 80 and buckle and with the inside wall welding of anodal shell 11, forms 1 between the inside wall of anodal utmost point ear 21 and anodal shell 11 and to fourth solder joint 92, and all the other structures are all the same with 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 battery discharging efficiency is favorably improved, meanwhile, the appearance of the positive electrode shell 11 can be kept complete, the leakage is avoided, and meanwhile, the annular conductive sleeve 80 is prevented from breaking the positive electrode lug 21.
The positive electrode tab 21 and the positive electrode case 11 of example 1 may be welded by any of other common welding methods such as laser welding, resistance welding by butt welding, and resistance welding by parallel welding.
Generally, the positive and negative electrode tabs (21, 22) are both metal foils that can be bent at will.
In the method for producing a button cell without welding marks in embodiments 1 to 3, in step S2, the two needle-shaped electrodes (100, 200) subjected to resistance welding may be respectively 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) as shown in fig. 3, 6, and 8, all the second welding points 60 are uniformly distributed around the circumference around the center of the negative electrode can 12. 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;
(2) as shown in fig. 4 and 7, the positive and negative electrode cases (11, 12) are partially overlapped in the vertical direction, the opening end wall of the negative electrode case 12 is located inside the opening end wall of the positive electrode case 11, a gap is left between the opening end wall of the negative electrode case 12 and the opening end wall of the positive electrode case 11, the insulating sealing ring 70 is clamped in the gap, the lower end of the insulating sealing ring 70 extends inwards to form a bent portion 71, the edge of the opening end wall of the negative electrode case 12 is wrapped in the bent portion 71, and an annular cavity is formed among the positive electrode case 11, the battery cell 30 and the bent portion 71 of the insulating sealing ring; the annular conductive sleeve 80 is embedded in the annular cavity, and the end face of the annular conductive sleeve 80, which is far away from the positive electrode shell 11, is abutted to the bottom of the bending part 71 of the insulating sealing ring. This structure makes the overall stability of the battery better. Further, as shown in fig. 4 and 7, an end of the annular conductive sleeve 80 away from the positive electrode can 11 is extended outward to form an annular folded edge 82. The arrangement of the annular folded edge 82 increases the butt joint surface between the end face of the annular conductive sleeve 80 and the insulating seal ring 70, and greatly improves the sealing performance of the package. Of course, the end of the annular conductive sleeve 80 may not be provided with the annular flange 82.
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 (13)
1. A production method of a button battery without welding marks comprises the steps that the button battery comprises a positive electrode shell and a negative electrode shell, 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 each other through upper and lower openings to form a cylindrical button battery shell; an electric core is matched and packaged in the cylindrical button battery shell, the electric core 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 pole lug, the positive pole lug is welded with the positive shell to realize the electric connection, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is welded with the negative shell to realize the electric connection, the welding method between the positive pole lug and the negative pole lug and the corresponding pole shell comprises the following steps:
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 needle-shaped electrodes, pressing a metal sheet on the inner surface of a negative electrode shell, respectively pressing the two first needle-shaped 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 needle-shaped 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 welding between the positive pole lug and the positive pole shell is realized in the following mode: the electric core is provided with a through hole-shaped annular conductive sleeve at the end part outer sleeve close to one end of the positive electrode shell, the end part edge of the annular conductive sleeve close to one end of the positive electrode shell is connected with the direct physical contact of the inner surface of the positive electrode shell, a notch is arranged at the end part edge, one end of the positive electrode lug, stretching out of the electric core, is bent along the outer side wall of the annular conductive sleeve after passing through the notch of the annular conductive sleeve and is welded with the outer side wall of the annular conductive sleeve, and a third welding spot is formed between the positive electrode lug and the outer side wall of the annular conductive sleeve.
2. The method for producing a button cell without welding marks according to claim 1, wherein the method comprises the following steps: in the step S3, the end of the positive tab extending out of the battery cell is bent along the inner side wall of the positive shell after passing through the notch of the annular conductive sleeve, and is welded to the inner side wall of the positive shell in a parallel welding resistance welding manner, and a fourth welding spot is formed between the positive tab and the inner side wall of the positive shell.
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 needle 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 needle 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 casing.
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 any welding mark according to any one of claims 1 to 7, wherein: 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; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive pole lug, the positive pole lug is further electrically connected with the positive shell, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is further electrically connected with the negative shell; 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: the tip overcoat that is close to positive pole shell one end of electric core is equipped with the annular conductive sleeve of a through-hole form, and the annular conductive sleeve be close to positive pole shell one end border and be connected with the direct physical contact of internal surface of positive pole shell, and seted up the breach on this annular conductive sleeve border, the one end of stretching out of electric core of anodal utmost point ear is passed the back by annular conductive sleeve's breach and is buckled along annular conductive sleeve's lateral wall and weld with annular conductive sleeve's lateral wall, is formed with the third solder joint between anodal utmost point ear and the annular conductive sleeve's the lateral wall.
10. 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.
11. The button cell without welding marks as set forth in claim 10, wherein: the second welding points of each pair are symmetrically distributed.
12. The button cell without welding marks as set forth in claim 9, wherein: the positive and negative electrode shells are partially overlapped in the vertical direction, the opening end wall of the negative electrode shell is positioned on the inner side of the opening end wall of the positive electrode shell, a gap is reserved between the opening end wall of the negative electrode shell and the opening end wall of the positive electrode shell, the insulating sealing ring is clamped in the gap, the lower end of the insulating sealing ring extends inwards to form a bent part, the edge of the opening end wall of the negative electrode shell is wrapped in the bent part, and an annular cavity is formed among the positive electrode shell, the battery cell and the bent part of the insulating sealing ring; the annular conductive sleeve is embedded in the annular cavity, and the end face of one end, far away from the positive electrode shell, of the annular conductive sleeve is abutted to the bottom of the bending part of the insulating sealing ring.
13. The button cell without welding marks as set forth in claim 12, wherein: and one end part of the annular conductive sleeve, which is far away from the positive electrode shell, extends outwards to form an annular folding edge.
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