JPH07211598A - Method of tabbing lead wire to aluminum foil - Google Patents

Abstract

PURPOSE:To weld a tab to an aluminum foil while a conversion coating formed on the surface of the Al foil is being stripped and to make the electric resistance of a welded part extremely small by a method wherein the tab mounted on the Al foil is irradiated with laser beams so as to have the shape of a character or a figure and the Al foil is welded to the tab. CONSTITUTION:A tab 6a for a lead wire 6 is placed on an Al foil 5, and a YAG laser beam having an oscillation wavelength of 1.06mum is shown from the side of the Al foil 5 through a pattern plate in which eight parallel-line through holes have been made. The Al foil 5 and the tab 6a are melted in the shape of the pattern plate and welded. At this time, welded parts 6b are welded in such a way that a conversion coating formed on the surface of the Al foil 5 has been stripped mostly, and the contact electric resistance of the welded parts 6b is made extremely small. In addition, the shape of the welded parts 6b may be formed as a number, a character or the like which has a meaning so as to be useful for the control of a product. Thereby, the electric performance of a capacitor can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for tabbing a lead wire on an aluminum foil, and more particularly, by irradiating a laser beam in the shape of a character or a figure on the overlapping portion of the aluminum foil and the tab of the lead wire. The overlapping part of the aluminum foil and the tab of the lead wire is partially melted and connected, and the tab attachment of the lead wire can be performed in an extremely short time so that the workability is greatly improved and the aluminum foil The present invention relates to a method of tabbing a lead wire to an aluminum foil, which increases a connection area between the lead wire and a tab of the lead wire, improves mechanical connection strength of the connection portion, and reduces electric contact resistance.

[0002]

2. Description of the Related Art Conventionally, a lead wire tabbing method for an aluminum foil is performed by a pressing method, ultrasonic welding, cold welder or the like. For example, the pressing method is a tabbing method shown in FIG. .9
An anode electrode foil 2 having a thickness of about 60% to 100 μm, or an aluminum foil having a purity of about 99.99% having a thickness of 40 to 50 μm, for example, which has an oxide film formed on the surface of about 9% aluminum foil. 3 and tab 1 of terminal 1 for pole lead-out in which lead wire 1b is fixed to tab 1a
a is overlapped, and the diameter is 0.5 m, for example, from the tab side.
m, a needle with a tip angle of 17 ° (not shown)
The hole 4 was formed by inserting a plurality of times into a hole 4 and the electrode foil 2 for an anode or the electrode foil 3 for a cathode and the tab 1a were mechanically coupled to each other.

However, according to the conventional tab attachment method, processing scraps are produced by the processing of the anode electrode foil 2, the cathode electrode foil 3 and the tab 1a, which contaminates the tab attaching device, and the processing causes the needle of the pinhole needle. The tip is worn out, and it is necessary to replace the gusset needle with a new one, and the replacement work of this gusset needle requires a great deal of skill and also requires a lot of man-hours.
The development of a tab attachment method that enables the reduction of the processing time has been earnestly desired.

Further, the width of the tab 1a is as small as about 0.8 mm, and the tab 1a has a diameter of 0.
Since the hole 4 of 5 mm has to be formed, even a slight displacement of the position is not allowed, and there is a drawback that the work is extremely difficult.

Similarly, the tab attachment method using ultrasonic welding or cold welder requires a relatively long time for processing, which has been an obstacle to improving productivity.

Further, an oxide film is formed on the surfaces of the electrode foil 2 for anode and the electrode foil 3 for cathode.
Also, in the conventional tab attachment method in which it is difficult to secure a large contact area between the cathode electrode foil 3 and the tab 1a, the tab 1a
The electrical connection with was not always sufficient, and there was room for improvement.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art. The purpose of the present invention is to make a tab or a character or a graphic placed on an aluminum foil. By welding the aluminum foil and the tab by irradiating the shape with a laser beam, the chemical film formed on the surface of the tab and the aluminum foil is peeled off and welded, and the electric resistance of the welded portion is made extremely small. It is to improve the electrical performance of the capacitor.

Still another object is to weld the aluminum foil and the tab in the shape of a character or a figure by the above-mentioned construction, so that a large area suitable for welding is welded in accordance with the size of the tab or the like to make electrical contact. It is to reduce the resistance and to firmly bond the aluminum foil and the tab.

Still another object is to use a laser marking device on a tab placed on an aluminum foil to pass a YAG through a pattern plate in which transmission holes are formed in the shape of characters or figures.
By irradiating a laser beam and melting and connecting the aluminum foil and the tab in the shape of letters or figures, it is possible to display the manufacturing lot number of the manufactured capacitor, the number of the manufacturing machine, the product number or the product category, etc. Management is to be performed easily.

Another object of the present invention is to improve the work efficiency of tab-attaching the lead wire to the aluminum foil by eliminating the need for positioning the aluminum foil and the tab with high accuracy.

[0011]

In summary, according to the method of the present invention (claim 1), the aluminum foil and the tab of the lead wire are superposed and placed, and the laser beam is applied to the superposed portion in the shape of a character or a figure. It is characterized in that the aluminum foil is irradiated from the aluminum foil side and the aluminum foil and the tab are melted and connected by a laser marking method.

Further, according to the present invention (claim 2), the aluminum foil and the tab of the lead wire are superposed and placed, and the superposed portion is irradiated with a laser beam in the shape of a character or a figure from the side of the aluminum foil. The aluminum foil and the tab are melted and connected by a laser marking method.

Further, according to the method of the present invention (claim 3), the aluminum foil and the tab of the lead wire are superposed and placed, and the superposed portion is passed through a pattern plate having a transmission hole in the shape of a character or a figure. A YAG laser beam is irradiated from the aluminum foil side to melt and connect the aluminum foil and the tab into the shape of the character or the figure.

According to the method of the present invention (claim 4), the aluminum foil and the tab of the lead wire are superposed and placed, and a laser marking device is used at the superposed portion to form a YAG laser beam in the shape of a character or a figure. Is irradiated from the side of the aluminum foil to melt and connect the aluminum foil and the tab to the shape of the character or figure.

[0015]

The electrolytic capacitor has an anode electrode foil formed by etching aluminum foil having a purity of about 99.99% to roughen the surface to increase the surface area and further oxidize it to form a dielectric oxide film. , An aluminum foil is subjected to an etching treatment to roughen the surface thereof, and a tab for pole extraction is fixed to the electrode foil for cathode, and the electrode foil for anode, electrode foil for cathode and insulating paper are alternately laminated to form a cylindrical shape. It is manufactured by rolling up into a flat shape close to an ellipse or the like.

In the laser marking method, Y is passed through a pattern plate in which a transmission hole is formed in a desired shape such as characters or figures.
This is a method of marking the surface of an object by irradiating it with an AG laser beam. By using the laser marking method for welding an aluminum foil and a tab, the welding work can be carried out in an extremely short time. Alternatively, the aluminum foil and the tab can be melted and welded in the shape of a figure to firmly weld in a wide area.

Since the welded portion has a character or graphic shape having a large area as described above, even if the relative positions of the aluminum foil and the tab are set to be slightly different,
The aluminum foil and the tab can be reliably welded without being affected by the variation, and the pattern of the pattern plate is changed according to the size of the tab, and a large area is used for welding the large tab. In addition, a small area pattern can be selected for welding small tabs, and the tabs can be welded to aluminum foil with optimum strength.

Further, since the aluminum foil and the tab are melted and fixed to each other, the chemical conversion film formed on the aluminum foil and the tab is welded in a state of being almost peeled off, and the electric resistance of the welded portion is made extremely small. Therefore, it is possible to improve the electrical performance of the capacitor and manufacture a highly reliable capacitor.

Further, since the shape of the welded portion can be any shape, the shape is constituted by meaningful numbers,
If the manufacturing lot number, the manufacturing machine number, the product number, the product category, etc. are displayed, it can be used for product management.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of tabbing lead wires on an aluminum foil according to the present invention will be described below with reference to the embodiments shown in the drawings. In FIGS. 1 and 2, for example, a width of 2.2 m
1. The tab 6a (width 1 mm, thickness 0.18 mm) of the lead wire 6 is placed on the tape-shaped aluminum foil 5 having a thickness of 50 m or a thickness of 50 μm or 100 μm.
A YAG (yttrium-aluminum-garnet) laser beam having an oscillation wavelength of 06 μm is irradiated in the direction of arrow A through a pattern plate in which eight parallel-line transmission holes are formed to form the aluminum foil 5 and the tab 6a in the shape (8 The shape of the parallel lines of the book) is melted and welded.

Welding portion 6 between aluminum foil 5 and tab 6a
Since b is melted and welded to the shape irradiated with the laser beam as described above, the chemical conversion coating 5a formed on the surface of the aluminum foil 5 is almost peeled off and welded, and the contact electric resistance of the welded portion is increased. Becomes extremely small.

The time required for welding the aluminum foil 5 and the tab 6a required 0.5 seconds according to the conventional press working method using a burr needle, but 0.15 seconds according to the laser marking method. Welding can be done in about 1/3 or less, and the contact electric resistance of the welded part can be reduced by about 40% from 0.5 mΩ to 0.3 mΩ by the press working method. Can be manufactured.

When welding the large-sized tab 6a to the aluminum foil 5, the pattern plate is changed to an X-shaped or meandering line-shaped pattern plate having a wider welding area in FIGS. Similarly, a YAG laser beam is irradiated through the pattern plate to melt and weld the welded portion 6b to the shape, and welding is performed in a wide area to perform strong welding with high peel strength.

In the example shown in FIG. 5, the shape of the welded portion 6b is a numeral, and the numeral is a meaningful numeral such as a manufacturing lot number, a manufacturing machine number, a product number, or a product classification. By doing so, it helps to manage the product.

In short, according to the method of tabbing lead wires on the aluminum foil 5 according to the present invention, the aluminum foil 5 and the tabs 6a of the lead wires 6 are placed on top of each other, and a character or figure shape is formed on the overlapping portion. This is a lead wire tab attaching method in which a laser beam is irradiated from the aluminum foil 5 side to melt and connect the aluminum foil 5 and the tab 6a by a laser marking method.

Further, in another method of tabbing lead wires to the aluminum foil 5 according to the present invention, the aluminum foil 5 and the tab 6a of the lead wire 6 are placed on top of each other, and characters or figures are placed on the overlapping portion. This is a method of tabbing lead wires in which a YAG laser beam is irradiated from the aluminum foil 5 side through a pattern plate in which a transparent hole is formed to melt the aluminum foil 5 and the tab 6a into a character or figure shape for connection. .

Further, in another method of tabbing the lead wire to the aluminum foil 5 according to the present invention, the aluminum foil 5 and the tab 6a of the lead wire 6 are superposed and placed, and the laser marking device is placed on the superposed portion. This is a method of tabbing lead wires in which a YAG laser beam is applied to the shape of a character or a figure from the side of the aluminum foil 5 to melt the aluminum foil 5 and the tab 6a into the shape of the character or the figure to connect them.

As described above, when the tab 6a is welded to the aluminum foil 5 by the method of the present invention, the aluminum foil 5 and the tab 6a are melted by the laser beam and welded, so that the aluminum foil 5 and the tab 6a are completely joined and the adhesive strength is increased. Greatly improved,
Further, its contact electric resistance is small and can be stabilized.

As a result of the test, it has been confirmed that the state of the back surface of the aluminum foil 5 after welding is finished very cleanly with almost no damage.

[0030]

As described above, according to the present invention, the tab placed on the aluminum foil is irradiated with a laser beam in the shape of characters or figures to weld the aluminum foil and the tab together. Since it is possible to perform welding while peeling off the chemical film formed on the surface of the foil, there is an effect that the electrical resistance of the welded portion can be made extremely small and the electrical performance of the capacitor can be improved.

Further, since the aluminum foil and the tab are welded in the shape of letters or figures, the electric contact resistance is reduced by welding in a wide area suitable for welding depending on the size of the tab and the like, and There is an effect that the aluminum foil and the tab can be firmly bonded.

Further, a YAG laser beam is applied to the tab placed on the aluminum foil through a pattern plate having a transparent hole formed in the shape of a letter or a figure by using a laser marking device, and the aluminum foil and the tab are lettered. Alternatively, since the connection is made by melting in the shape of a figure, it is possible to display the manufacturing lot number of the manufactured capacitor, the manufacturing machine number, the product number or the product classification, etc., and it is possible to obtain the effect of easy management. To be

Further, since it is not necessary to position the aluminum foil and the tab with high precision, there is an effect that the work efficiency of the tab attaching of the lead wire to the aluminum foil can be improved.

[Brief description of drawings]

FIG. 1 to FIG. 5 relate to an embodiment of the present invention, and FIG. 1 is a perspective view showing a winding state of an aluminum foil tab-attached to the aluminum foil by a laser marking method.

FIG. 2 is an enlarged vertical cross-sectional view of an essential part showing a joint surface between an aluminum foil and a tab.

FIG. 3 is a plan view showing another embodiment of the aluminum foil tabbed by the laser marking method.

FIG. 4 is a plan view showing still another embodiment of the aluminum foil tabbed by the laser marking method.

FIG. 5 is a plan view showing still another embodiment of the aluminum foil tabbed by the laser marking method.

FIG. 6 is a perspective view similar to FIG. 1 according to a conventional example.

[Explanation of symbols]

 5 Aluminum foil 6a Lead wire tab

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area H01G 9/008

Claims (4)

[Claims] 1. An aluminum foil and a tab of a lead wire are placed one on top of the other, and a laser beam is applied to the overlapping portion from the side of the aluminum foil to form a character or a figure, and the aluminum foil is applied by a laser marking method. And a tab for attaching a lead wire to an aluminum foil, characterized in that the tab and the tab are melted and connected. 2. The aluminum foil and the tab of the lead wire are placed in an overlapping manner, and the overlapping portion is irradiated with a laser beam in the shape of a character or a figure from the side of the aluminum foil to form the aluminum foil by a laser marking method. An aluminum foil for capacitors, characterized in that the tab and the tab are melted and connected. 3. An aluminum foil and a tab of a lead wire are placed on top of each other, and a YAG laser beam is passed from the aluminum foil side through a pattern plate in which a transmission hole is formed in the shape of a character or a figure in the overlapping portion. A method of tabbing lead wires to an aluminum foil, which comprises irradiating to melt and connect the aluminum foil and the tab in the shape of the character or figure. 4. An aluminum foil and a tab of a lead wire are placed one on top of the other, and a laser marking device is used to irradiate a YAG laser beam from the side of the aluminum foil in the shape of a character or a figure using the laser marking device. A method of tabbing lead wires to an aluminum foil, characterized in that the aluminum foil and the tab are melted and connected in the shape of the character or figure.