CN111463395B - Button cell production method capable of reducing false welding rate and button cell produced by button cell production method - Google Patents
Button cell production method capable of reducing false welding rate and button cell produced by button cell production method Download PDFInfo
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- CN111463395B CN111463395B CN202010334715.6A CN202010334715A CN111463395B CN 111463395 B CN111463395 B CN 111463395B CN 202010334715 A CN202010334715 A CN 202010334715A CN 111463395 B CN111463395 B CN 111463395B
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- 238000003466 welding Methods 0.000 title claims abstract description 101
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 241000237983 Trochidae Species 0.000 claims abstract description 51
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 239000011810 insulating material Substances 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims 1
- 229910001416 lithium ion Inorganic materials 0.000 claims 1
- 230000002950 deficient Effects 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 description 20
- 239000010410 layer Substances 0.000 description 9
- 229910000679 solder Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008961 swelling Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/216—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for button or coin cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/04—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
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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
- 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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- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a button cell production method capable of reducing false welding rate and a button cell prepared by the button cell production method, wherein the button cell production method comprises the following steps: firstly, pressing a lug with the same polarity as the bottom shell on the inner surface of the bottom shell, and then welding the lug on the inner surface of the bottom shell, wherein a first welding spot is formed between the lug and the bottom shell and is positioned on the inner bottom surface of the bottom shell outside the vertical projection area of the axial cavity of the battery cell; then, the battery cell is arranged in the bottom shell; and then, the top shell is covered above the bottom shell, the top shell and the upper opening and the lower opening of the bottom shell are oppositely buckled to form a cylindrical button battery shell, the battery core is contained in the cylindrical button battery shell, and the lug with the same polarity as the top shell is electrically connected with the top shell. By the production method, the welding strength between the tab and the corresponding electrode shell can be detected simply and easily, so that the false welding rate of the button cell is reduced, and the defective rate of products is finally reduced.
Description
Technical Field
The invention relates to a button cell production method capable of reducing false welding rate and a button cell prepared by the button cell production method.
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 both resistance welding and laser welding have the risk of cold joint, the welding operation between the first output conductor and the first pole shell in the prior art is performed after the battery cell is installed in the first pole shell, and the welding strength cannot be detected in time, so that the defective rate of the button battery is high; in addition, first output conductor extends to usually with electric core axial cavity regional among the prior art to weld fixation realizes the electricity and connects between this region and the first polar shell, however, because electric core can take place radial expansion after absorbing electrolyte, electric core expansion can drive first output conductor and take place radial movement, lead to the solder joint fracture easily to make first output conductor drop from first polar shell, and the solder joint position of first output conductor is electrically conductive region usually, the solder joint position of first output conductor has in axial cavity regional and expands to the electric core second pole piece of axial cavity with the inflation and take place the risk that the contact leads to the short circuit.
Disclosure of Invention
One of the purposes of the invention is to provide a button cell production method for reducing the false welding rate, and the production method enables the detection of the welding strength between a tab and a corresponding electrode shell to be simple and easy, so that the false welding rate of the button cell is reduced, and the defective rate of products is finally reduced.
The button battery production method for reducing the virtual welding rate comprises a positive electrode shell, a negative electrode shell and an electric core, wherein the positive electrode shell and the negative electrode shell are both in a cup shape, the electric core is mainly formed by winding a positive electrode plate, a negative electrode plate and a diaphragm, an axial cavity is formed in the center of the electric core, the positive electrode plate is electrically connected with a positive electrode lug, the negative electrode plate is electrically connected with a negative electrode lug, one of the positive electrode shell and the negative electrode shell serves as a bottom shell, and the other serves as a top shell, and the button battery production method comprises the following steps:
s1: pressing a lug with the same polarity as the bottom shell against the inner surface of the bottom shell, and then welding the lug on the inner surface of the bottom shell, wherein a first welding point is formed between the lug and the bottom shell and is positioned on the inner bottom surface of the bottom shell outside the vertical projection area of the axial cavity of the battery cell;
s2: the battery cell is arranged in the bottom shell;
s3: the top shell is covered above the bottom shell, the top shell and the upper opening and the lower opening of the bottom shell are oppositely buckled to form a cylindrical button battery shell, the battery core is contained in the cylindrical button battery shell, and the lug with the same polarity as the top shell is electrically connected with the top shell.
According to the invention, before the battery cell is assembled into the bottom shell, the lug with the same polarity as the bottom shell is welded on the inner surface of the bottom shell, because the battery cell is not assembled, the battery cell cannot be damaged by welding current or laser during welding, and the welding strength between the lug and the bottom shell can be judged by manually and lightly pulling the lug outwards, if the lug and the bottom shell are in fault welding, the lug can fall off from the bottom shell when being pulled outwards and lightly, so that the fault welding can be timely repaired or eliminated, the fault welding rate is reduced, and unnecessary waste is avoided while the yield is improved. In addition, the first welding spot is positioned on the inner bottom surface of the bottom shell outside the vertical projection area of the axial cavity of the battery cell, so that the welding spot position on the lug is always limited in a crack between the battery cell and the corresponding pole shell, the situation that the welding spot position of the lug falling off from the inner surface of the pole shell is in any contact with a battery cell pole piece longitudinally expanded and expanded into the axial cavity of the battery cell is avoided, and the short circuit phenomenon is avoided.
Preferably, the pole lug with the same polarity as the top shell is electrically connected with the top shell through welding, and the welding connection is firmer. Further, the welding step between the pole ear with the same polarity as the top shell and the top shell is as follows: and pressing the pole lug with the same polarity as the top shell on the inner surface of the top shell, and then welding the pole lug on the inner surface of the top shell to form a second welding point between the pole lug and the top shell. When the lug with the same polarity as the top shell is welded on the inner surface of the top shell, the top shell is not buckled with the bottom shell, so that the lug can be pulled outwards gently by manpower to judge the welding strength between the lug and the top shell, and if the lug is a cold joint, the lug is timely subjected to repair welding or rejection. In the specific implementation process, the pole lug with the same polarity as the top shell is welded with the top shell through any one of resistance welding and laser welding.
In the specific implementation process, the tab with the same polarity as the bottom shell is welded with the bottom shell in any one welding mode of resistance welding and laser welding.
Preferably, the bottom shell is a negative electrode shell, and the top shell is a positive electrode shell.
Preferably, the short circuit phenomenon is avoided on the inner bottom surface of the top shell outside the vertical projection area of the axial cavity of the second welding spot battery cell.
The invention also aims to provide a button battery, which comprises a positive electrode shell, a negative electrode shell, a battery core and an insulating sealing ring, 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 is mainly formed by winding a positive plate, a negative plate and a diaphragm, an axial cavity is formed in the center of the battery cell, the positive plate is electrically connected with a positive pole lug, and the positive pole lug is electrically connected with a positive pole shell; the negative plate is electrically connected with a negative pole tab, and the negative pole tab is electrically connected with the negative pole shell; at least one of the electric connection structure between the positive electrode tab and the positive electrode shell and the electric connection structure between the negative electrode tab and the negative electrode shell is as follows: the electrode lugs are fixed on the inner surface of the corresponding electrode shell in a welding mode through the first welding points, so that the electrode lugs are electrically connected with the corresponding electrode shell, and the first welding points are located on the inner bottom surface of the electrode shell outside the vertical projection area of the axial cavity of the battery core.
The first welding spot of the button battery is positioned on the inner bottom surface of the pole shell outside the vertical projection area of the axial cavity of the battery cell, so that the welding spot position on the lug is always limited in a crack between the battery cell and the corresponding pole shell, the welding spot position of the lug is prevented from contacting with a battery cell pole piece longitudinally expanded and expanded into the axial cavity of the battery cell, and the short circuit phenomenon is avoided.
Preferably, one of the electrical connection structure between the positive electrode tab and the positive electrode shell and the electrical connection structure between the negative electrode tab and the negative electrode shell is as follows: utmost point ear through first solder joint welded fastening on the internal surface of corresponding polar shell, and first solder joint is located the polar shell outside electric core axial cavity vertical projection region, and another electric connection structure is: and the pole lugs are welded and fixed on the inner surface of the corresponding pole shell through second welding points. The welding connection is firmest and is not influenced by external environmental factors. Further preferably, the second welding spot is positioned on the inner bottom surface of the electrode shell outside the vertical projection area of the axial cavity of the battery cell, so that the short circuit phenomenon is avoided.
Preferably, the inner surfaces of the positive and negative electrode shells are uniformly distributed with positive and negative metal patches respectively, the positive and negative electrode tabs are uniformly distributed with the outer surfaces of the positive and negative metal patches respectively, the positive and negative metal patches can play a role in collecting current, the thickness of the positive and negative electrode shells is enhanced, and the bulge phenomenon of the positive and negative electrode shells is avoided.
Preferably, the tab of any one of the positive electrode and the negative electrode outside the battery cell except the position welded with the corresponding electrode shell is coated with an insulating material layer to avoid short circuit.
Drawings
Fig. 1 is a schematic view of a welding structure between a bottom case and a corresponding tab in embodiment 1, wherein the bottom case is a cross-sectional view;
fig. 2 is a schematic view of a welding structure between a top case and a corresponding tab in embodiment 1, wherein the bottom case and the top case are both in cross-sectional views;
FIG. 3 is a schematic sectional view of a button cell in accordance with example 1;
FIG. 4 is a schematic sectional view of a button cell in accordance with example 2;
fig. 5 is a schematic sectional view of a button cell according to the present invention when both the positive and negative electrodes are provided with metal sheets.
Detailed Description
Embodiments of the present invention will now be described in detail with reference to the accompanying drawings:
example 1
With reference to fig. 1 to 3, a method for producing a button cell capable of reducing a virtual welding rate, the button cell includes a positive electrode shell 11, a negative electrode shell 12 and a cell 30, the positive electrode shell 11 and the negative electrode shell 12 are both cup-shaped, the cell 30 is mainly formed by winding a positive electrode plate 31, a negative electrode plate 32 and a diaphragm 33, an axial cavity 34 is formed at the center of the cell 30, the positive electrode plate 31 is electrically connected with a positive electrode tab 21, the negative electrode plate 32 is electrically connected with a negative electrode tab 22, the positive electrode shell 11 and the negative electrode shell 12 are both cup-shaped, the negative electrode shell 12 serves as a bottom shell, and the positive electrode shell 11 serves as a top shell, and the method for producing the button cell includes the following steps:
s1: pressing a tab with the same polarity as that of the bottom case 12 against the inner surface of the bottom case 12, and then welding the tab to the inner surface of the bottom case 12 to form a first welding point 50 between the tab and the bottom case 12, where the first welding point 50 is located on the inner bottom surface of the bottom case 12 outside the vertical projection area of the cell axial cavity 34;
s2: the battery core 30 is loaded into the bottom shell 12;
s3: covering the top shell 11 above the bottom shell 12, oppositely buckling the top shell 11 and the bottom shell 12 to form a cylindrical button battery shell, and accommodating a battery cell therein, wherein a tab 21 with the same polarity as the top shell 11 is electrically connected with the top shell 11;
the tab 21 with the same polarity as the top shell 11 is electrically connected with the top shell 11 by welding, and the specific welding steps are as follows: a tab 21 having the same polarity as the top case 11 is pressed against the inner surface of the top case 11, and then the tab 21 is welded to the inner surface of the top case 11, forming a second welding point 60 between the tab 21 and the top case 11.
As shown in fig. 3, the button cell is manufactured according to the method for manufacturing the button cell with the reduced false welding rate of example 1, the button cell comprises a positive electrode shell 11, a negative electrode shell 12, a cell 30 and an insulating seal ring 70, the positive electrode shell 11 and the negative electrode shell 12 are both cup-shaped, and the upper and lower openings of the positive electrode shell 11 and the negative electrode shell 12 are oppositely buckled to form a cylindrical button cell shell; a gap is reserved between the positive electrode shell 11 and the negative electrode shell 12, the 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 winding a positive plate 31, a negative plate 32 and a diaphragm 33, an axial cavity 34 is formed in the center of the battery cell 30, the positive plate 31 is electrically connected with a positive pole tab 21, and 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 pole shell 12;
the electrical connection structure between the negative electrode tab 22 and the negative electrode can 12 is: the negative electrode tab 22 is welded and fixed on the inner surface of the negative electrode shell 12 through a first welding point 50, so that the negative electrode tab 22 is electrically connected with the negative electrode shell 12, and the first welding point 50 is located outside the vertical projection area of the axial cavity of the battery cell of the negative electrode shell 12; the electric connection structure between the positive electrode tab 21 and the positive electrode shell 11 is as follows: the positive electrode tab 21 is welded and fixed on the inner surface of the positive electrode can 11 through a second welding point 60.
The welding strength between the tab 22 and the bottom case 12 can be judged by manually and lightly pulling the tab outwards, so that welding or elimination can be timely performed, the yield is improved, and unnecessary waste is avoided at the same time.
Example 2
As shown in fig. 4, a method for producing a button cell with reduced false welding rate, which is different from the method for producing a button cell with reduced false welding rate of example 1, is as follows: the tab 21 with the same polarity as the top case 11 is electrically connected to the top case 11 through a conductive adhesive.
The button cell is produced according to the button cell production method for reducing the false welding rate of the embodiment 2, and is different from the button cell of the embodiment 1 in that: the positive electrode tab 21 is fixed on the inner surface of the positive electrode can 11 by gluing through a conductive adhesive layer 100.
Of course, the invention is not limited to the negative casing as the bottom casing, and it may also be: the positive electrode shell serves as a bottom shell, and the negative electrode shell serves as a top shell. In addition, when one of the electrical connection structure between the positive electrode can 11 and the positive electrode tab 21 and the electrical connection structure between the negative electrode can 12 and the negative electrode tab 22 is adopted: the electrode lugs are fixed on the inner surface of the corresponding pole shell in a welding mode through the first welding spots, so that the electrode lugs are electrically connected with the corresponding pole shell, the first welding spots are located on the pole shell outside the vertical projection area of the axial cavity of the battery cell, and the other electric connection structure can also realize the electric connection of the electrode lugs and the corresponding pole shell in a physical contact mode.
In a specific implementation process, the tab 22 of the battery cell 30 having the same polarity as the bottom case 12 is welded to the bottom case 12 by any one of resistance welding and laser welding.
When the tab 21 having the same polarity as the top case 11 is also welded to the top case 11 to achieve electrical connection, the tab having the same polarity as the top case 11 is welded to the top case 11 by any one of resistance welding and laser welding.
For the button cell of embodiment 1, as shown in fig. 3, preferably, the second welding point 60 is located on the inner bottom surface of the top case 11 outside the vertical projection area of the cell axial cavity 34, so as to prevent a short circuit phenomenon. Of course, the second welding points 60 are not limited to be located on the top case 11 outside the vertical projection area of the cell axial cavity 34, and may also be located on the top case 11 inside the vertical projection area of the cell axial cavity 34. As shown in fig. 5, preferably, a positive electrode metal patch 41 is laid on the inner surface of the positive electrode can 11, the positive electrode tab 11 is electrically connected to the outer surface of the positive electrode metal patch 41, and the positive electrode metal patch 41 can function as a current collector and enhance the thickness of the positive electrode can 11 to prevent the positive electrode can 11 from swelling. Of course, the positive electrode tab 41 may not be provided on the inner surface of the positive electrode can 11, and in this case, the inner surfaces of the positive electrode can 11 and the positive electrode tab 21 are directly connected to each other.
For the button batteries of examples 1 and 2, as shown in fig. 5, it is preferable that the negative electrode metal patch 42 is laid on the inner surface of the negative electrode casing 12, the negative electrode tab 22 is electrically connected to the outer surface of the negative electrode metal patch 42, and the negative electrode metal patch 42 can function as a current collector, and at the same time, the thickness of the negative electrode casing 12 is increased to avoid the swelling phenomenon of the negative electrode casing 12. Of course, the negative electrode can 12 may not have the negative electrode metal tab 42 on the inner surface thereof, and in this case, the negative electrode can 12 and the negative electrode tab 22 are directly connected to each other. As shown in fig. 3 to 5, it is preferable that the positions of the negative electrode tab 22 outside the battery cell 30, except for the position welded to the negative electrode case 12, are covered with an insulating material layer 81 to avoid short circuit. Meanwhile, as shown in fig. 3 to 5, the positive electrode tab 21 outside the battery cell 30 except the position welded to the positive electrode case 11 is coated with an insulating material layer 82 to avoid short circuit. Of course, the positive and negative electrode tabs (21, 22) may not be covered with the insulating material layers (81, 82), and at this time, the positive electrode tab 31, the negative electrode tab 32 and the separator 33 in the battery cell 30 may be arranged in a vertically staggered manner to avoid short circuit, an insulating layer may be correspondingly covered on both end surfaces of the battery cell 30 facing the inner surface of the positive electrode case 11 and the inner surface of the negative electrode case 12, and the positive and negative electrode tabs (21, 22) penetrate through the corresponding insulating material layers (81, 82) and are electrically connected with the inner surfaces of the corresponding electrode cases (11, 12) on the outer sides of the insulating material layers (81, 82), or the positive and negative electrode tabs (21, 22) are wound from the sides of the corresponding insulating layers (81, 82) to the outer sides of the insulating material layers (81, 82) and are electrically connected with the inner surfaces of the corresponding electrode cases (11, 12).
It should be noted that the number of the first welding points 50 and the second welding points 60 of the present invention is not limited to 1 in the drawings, and may be 2 or more than 2. 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 (7)
1. The utility model provides a button cell production method of reducing virtual welding rate, button cell includes positive pole shell, negative pole shell and electric core, positive pole shell and negative pole shell all are the cup, electric core mainly is formed by positive plate, negative pole piece, diaphragm coiling, the center of electric core is formed with the axial cavity, positive plate and a positive pole utmost point ear electricity are connected, negative pole piece and a negative pole utmost point ear electricity are connected, and one utmost point shell in positive pole shell and the negative pole shell is as drain pan, another utmost point shell as the top shell, its characterized in that, button cell production method includes the following step:
s1: pressing a lug with the same polarity as the bottom shell against the inner surface of the bottom shell, and then welding the lug on the inner surface of the bottom shell, wherein a first welding point is formed between the lug and the bottom shell and is positioned on the inner bottom surface of the bottom shell outside the vertical projection area of the axial cavity of the battery cell;
s2: the battery cell is arranged in the bottom shell;
s3: the top shell is covered above the bottom shell, the top shell and the upper opening and the lower opening of the bottom shell are oppositely buckled to form a cylindrical button battery shell, the battery core is contained in the cylindrical button battery shell, wherein the lug with the same polarity as the top shell is electrically connected with the top shell through welding, and when the lug with the same polarity as the top shell is welded on the inner surface of the top shell, the top shell is not buckled with the bottom shell; the welding steps between the lug with the same polarity as the top shell and the top shell are as follows: and pressing a lug with the same polarity as the top shell on the inner surface of the top shell, welding the lug on the inner surface of the top shell, and forming a second welding spot between the lug and the top shell, wherein the second welding spot is positioned on the inner bottom surface of the top shell outside the vertical projection area of the axial cavity of the battery core.
2. The button cell production method for reducing the false welding rate as claimed in claim 1, wherein the button cell production method comprises the following steps: and the pole ear with the same polarity as the top shell is welded with the top shell by any one of resistance welding and laser welding.
3. The button cell production method for reducing the false welding rate as claimed in claim 1, wherein the button cell production method comprises the following steps: and the lug with the same polarity as the bottom shell is welded with the bottom shell in any one welding mode of resistance welding and laser welding.
4. The button cell production method for reducing the false welding rate as claimed in claim 1, wherein the button cell production method comprises the following steps: the bottom shell is a negative electrode shell, and the top shell is a positive electrode shell.
5. The button battery manufactured by the button battery production method for reducing the false welding rate according to claim 1 comprises a positive electrode shell, a negative electrode shell, an electric core and an insulating sealing ring, wherein the positive electrode shell and the negative electrode shell are 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 is mainly formed by winding a positive plate, a negative plate and a diaphragm, an axial cavity is formed in the center of the battery cell, the positive plate is electrically connected with a positive pole lug, and the positive pole lug is electrically connected with a positive pole shell; the negative plate is electrically connected with a negative pole tab, and the negative pole tab is electrically connected with the negative pole shell; the lithium ion battery is characterized in that one of an electric connection structure between the positive pole lug and the positive pole shell and an electric connection structure between the negative pole lug and the negative pole shell is as follows: the electrode lugs are welded and fixed on the inner surface of the corresponding electrode shell through first welding points, so that the electrode lugs are electrically connected with the corresponding electrode shell, and the first welding points are positioned on the inner bottom surface of the electrode shell outside the vertical projection area of the axial cavity of the battery cell; the other electric connection structure is as follows: the electrode lugs are fixed on the inner surface of the corresponding electrode shell in a welding mode through second welding spots, and the second welding spots are located on the inner bottom surface of the electrode shell outside the vertical projection area of the axial cavity of the battery cell.
6. A button cell according to claim 5, wherein: the inner surfaces of the positive and negative electrode shells are respectively and correspondingly fixedly paved with positive and negative electrode metal patches, and the positive and negative electrode tabs are respectively and correspondingly electrically connected with the outer surfaces of the positive and negative electrode metal patches.
7. A button cell according to claim 5, wherein: the tab of any one of the positive pole and the negative pole outside the battery core is coated with an insulating material layer except the position welded with the corresponding pole shell.
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| CN114156575B (en) * | 2020-08-17 | 2023-07-07 | 华为技术有限公司 | Button cell, battery module and electronic equipment |
| CN215496865U (en) * | 2021-05-26 | 2022-01-11 | 惠州亿纬锂能股份有限公司 | Battery case and lithium battery |
| CN113937428A (en) * | 2021-09-30 | 2022-01-14 | 广东微电新能源有限公司 | Battery, battery preparation method, battery detection method and electronic equipment |
| CN114619144A (en) * | 2022-02-25 | 2022-06-14 | 昆山兴能能源科技有限公司 | Laser welding method for button battery |
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