JPH0464214A - Manufacture of electrolytic capacitor - Google Patents

Abstract

PURPOSE:To prevent intrusion into a winding element of a foreign matter such as chip and dropping alcohol at the time of drilling by previously drilling holes for contact-bonding a flat tab with a terminal strip to the flat tab before the flat tab is joined with an anode foil and a cathode foil. CONSTITUTION:Holes 5 for contact bonding with a terminal strip are bored at the positions of the front end of the projecting section 3b of a flat tab 3. Alcohol is dropped continuously or intermittently to a punch and a die used on the boring. Dropping alcohol is dried, and brushing and suction for removing chip or other foreign matters are conducted. Consequently, even when the foreign matter such as chip or dropping alcohol adheres on the flat tab 3 on drilling, these foreign matters and alcohol can be removed positively. Since the flat tab 3 is joined with an electrode foil 4 after the treatment, intrusion into a winding element of the foreign matter such as chip and dropping alcohol can positively be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing an electrolytic capacitor.

[Prior Art] Conventionally, in manufacturing electrolytic capacitors, flat tabs are supplied to an anode foil and a cathode foil, and they are joined by cold welding or stitch pressing, and then the anode foil and the cathode foil are bonded through capacitor paper. By winding it up, a capacitor element was formed.

Incidentally, FIG. 3 is a diagram showing the capacitor element 11 formed in this manner and the flat tab 12 wound inside the capacitor element 11.

After forming the capacitor element 11 in this way,
The protruding portion of the flat tab 12 was crimped to a terminal plate (not shown). For this crimping, it is necessary to have a hole in the flat tab 12 that matches the rivet on the terminal board, so with the capacitor element 11 in the state shown in FIG. Was.

[Problems to be Solved by the Invention] However, the conventional method for manufacturing an electrolytic capacitor as described above has the following drawbacks.

That is, when drilling a hole in the protruding part of the flat tab for crimping the terminal plate with the capacitor element formed, if the drilling position of the flat tab is near the joint by cold welding or stitch pressing, Foreign matter such as drilling debris during this drilling may adhere to the flat tab or electrode foil and may even enter the capacitor element, causing problems such as short circuits.

In addition, when drilling flat tabs, alcohol is dripped in order to prevent the deterioration of the punches and dies used for punching and to extend their service life. Therefore, there is a risk that it may infiltrate into the joints and, therefore, into the capacitor element, causing poor characteristics such as poor contact.

Furthermore, when drilling the flat tab protruding from the end surface of the capacitor element after it has been formed, be careful not to apply mechanical stress or damage to the joint between the capacitor element and the flat tab. However, since the protrusion of the flat tab is short, it is difficult to hold the flat tab while drilling without adding mechanical stress or damage, resulting in reduced productivity and However, it had the disadvantage of requiring special equipment.

The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to prevent foreign substances such as drilling debris and alcohol dropped during drilling from entering or penetrating into the winding element. It is an object of the present invention to contribute to improving the characteristics of electrolytic capacitors by providing a method for manufacturing electrolytic capacitors that does not cause such problems and has excellent productivity.

[Means for Solving the Problems] The method for manufacturing an electrolytic capacitor according to the present invention involves joining a flat tab for electrode extraction to an anode foil and a cathode foil by cold welding or stitch pressing, and then winding it up with capacitor paper interposed therebetween. In an electrolytic capacitor manufacturing method in which a capacitor element is formed and the protruding part of the flat tab of the capacitor element is crimped to a terminal plate, the flat tab is crimped to the terminal plate before the flat tab is bonded to the anode foil and the cathode foil. It is characterized by having holes drilled in advance for this purpose.

In addition, flat tabs are continuously supplied to the joining position on the electrode foil using a long flat tab matrix, and the perforation of the flat tab is performed at the joining position where joining is performed by cold welding or stitch press. It is desirable to do this at a position in front of you that is at least a predetermined distance away.

On the other hand, when perforating a flat tab, it is possible to continuously or intermittently drip alcohol into the punch or die used, but in this case, the flat tab can be joined by cold welding or stitch press. Before you do
Brushing and suction are recommended to dry the dropped alcohol and remove drilling debris or other foreign matter.

[Function] In the method for manufacturing an electrolytic capacitor of the present invention having the above-described configuration, by drilling a hole before joining the flat tab to the electrode foil, the flat tab is free from foreign matter such as drilling debris or Even if the dropped alcohol adheres, the flat tab can be bonded to the electrode foil after these are treated, so foreign matter such as perforation debris and the dropped alcohol can be reliably prevented from entering or penetrating into the winding element.

In addition, in the present invention in which holes are drilled before the flat tab is bonded to the electrode foil, unlike the case where the holes are drilled after the flat tab is bonded to the electrode foil and the capacitor element is formed, the holes are drilled into the capacitor element and the bonded portion. There is no need to consider the negative effects of this, and only the flat tabs need to be held and drilled, making the work easier, improving productivity, and eliminating the need for special equipment.

Furthermore, flat tabs are continuously supplied using a long flat tab matrix, and the holes in the flat tabs are drilled at least a predetermined distance from the joining position where cold welding or stitch press is performed. If the process is performed at the same location, foreign matter such as drilling debris or dripping alcohol attached to the flat tab can be disposed of during the travel time from the drilling position to the joining position.

On the other hand, even if foreign matter such as drilling debris or dropped alcohol adheres to the joint position of the flat tab, it is possible to dry the dropped alcohol and perform brushing and suction to remove the drilling debris or other foreign matter. , foreign matter such as drilling debris or dripping alcohol can be reliably removed.

[Example 1] An example of the method for manufacturing an electrolytic capacitor according to the present invention will be specifically described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a long flat tab base body, which is cut at cut positions 2 for each predetermined length, and is cut to a predetermined length (-
unit) of flat tabs 3 are continuously supplied. This - unit flat tab 3 consists of a joint part 3a that is joined to the electrode foil 4 and wound into the capacitor element, and a protrusion part 3b that projects from the capacitor element.

In manufacturing an electrolytic capacitor, the flat tab base body 1 is continuously supplied to the bonding position of the electrode foil 41-.
Before this joining position, the flat tab 3 is perforated. That is, in the flat tab 3 located a predetermined distance or more, specifically, at least 5 or 6 tabs before the joining position where cold welding or stitch pressing is performed, the terminal is placed at the tip of the protrusion 3b. A hole 5 for crimping with the plate is bored. During this perforation, alcohol is continuously or intermittently dripped onto the punch and die used. Thereafter, the dropped alcohol is dried, and brushing and suction are performed to remove drilling debris and other foreign matter.

Next, the joint portion 3a of the flat tab 3 at the tip is joined to the electrode foil 4 by cold welding. 6 in the figure indicates such a cold weld point.

After this, the flat tab 3 is separated from the flat tab base body 1 at a cutting position 2 corresponding to the flat tab 3, thereby forming an independent flat tab 3.

The subsequent flat tab 3, which has newly become the tip of the flat tab base 1 by this cutting, is similarly joined to another electrode foil 4 by cold welding and then separated from the flat tab base 1. below,
By the same procedure, the flat tabs 3 are sequentially joined and divided, and the flat tabs 3 are successively joined.

Then, a pair of electrode foils (anode foil and cathode foil) formed by joining the flat tabs 3 in this way are wound up with capacitor paper interposed therebetween to form a capacitor element 7 as shown in FIG.
Thereafter, although not shown, the protrusion of the flat tab 3 of the capacitor element 7 is crimped to a terminal plate (not shown).

The manufacturing method of this embodiment as described above provides the following effects.

That is, before joining the flat tab 3 to the electrode foil 4, the crimping hole 5 is bored, and after this, the dropped alcohol is dried, and brushing and suction are performed to remove drilling debris or other foreign matter. Therefore, even if foreign matter such as drilling debris or dripping alcohol adheres to the flat tab 3 during drilling, these can be reliably removed. Since the flat tab 3 is bonded to the electrode foil 4 after this treatment, foreign matter such as drilling debris and dripping alcohol are prevented from being absorbed, compared to the conventional technique in which the flat tab 3 is perforated after forming the capacitor element. Intrusion into or penetration into the winding element can be reliably prevented.

Furthermore, in this embodiment, the holes are drilled before the flat tab 3 is bonded to the electrode foil 4, unlike the conventional technique in which the holes are drilled after the flat tab is bonded to the electrode foil and the capacitor element is formed. There is no need to consider adverse effects on the capacitor element and the joint, and it is only necessary to hold the flat tab 3 and drill the hole, making the work easier. Therefore, productivity can be improved and special equipment is not required.

In particular, in this embodiment, the flat tab base 1 is used to continuously supply the flat tabs 3, and the
Since the crimp hole 5 is drilled in the flat tab 3 at a predetermined distance or more, specifically at least 5 or 6 positions in advance, the crimp hole 5 adheres to the flat tab within the travel time from this punching position to the joining position. This method also has the advantage of being able to effectively utilize time and improve productivity, since foreign matter such as drill bits and dripping alcohol can be disposed of.

Note that the present invention is not limited to the above embodiments,
The flat tab and the electrode foil can also be joined by a stitch press.

Further, the method for disposing of foreign matter such as drilling debris or dripping alcohol attached to the flat tab can be selected as appropriate.

[Effects of the Invention] As explained above, in the method for manufacturing an electrolytic capacitor of the present invention, before joining the flat tab to the anode foil and the cathode foil,
By pre-drilling a hole in the flat tab for crimping it to the terminal plate, the flat tab can be bonded to the electrode foil after removing foreign matter such as drilling debris or dripping alcohol that adhered to the flat tab during drilling. It is possible to reliably prevent foreign matter such as drilling debris and alcohol dripped during drilling from entering or penetrating into the winding element, and it is possible to provide an electrolytic capacitor with excellent characteristics, and is also excellent in productivity.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view showing a manufacturing process in an embodiment of the method for manufacturing an electrolytic capacitor according to the present invention, FIG. 2 is a perspective view showing a capacitor element formed by the same embodiment, and FIG. The figure is a perspective view showing a capacitor element formed by a conventional electrolytic capacitor manufacturing method. DESCRIPTION OF SYMBOLS 1...Flat tab base, 2...Cut position, 3...Flat tab, 3a...Joint part, 3b...Protrusion part, 4...
Electrode foil, 5...Crimping hole, 6...Cold weld point, 7...Capacitor element. 11... Capacitor element, 12... Flat tab.

Claims (4)

[Claims] (1) After joining the flat tab for electrode extraction to the anode foil and the cathode foil by cold welding or stitch pressing, the capacitor element is formed by winding it up with capacitor paper interposed therebetween.
In this method of manufacturing an electrolytic capacitor in which the protrusion of the flat tab of the capacitor element is crimped to the terminal plate, before the flat tab is joined to the anode foil and the cathode foil, a hole is formed in the flat tab for crimping the flat tab to the terminal plate. A method for manufacturing an electrolytic capacitor, characterized in that holes are pre-drilled. (2) Using a long flat tab base, flat tabs are continuously supplied to the bonding position on the electrode foil, and the holes in the flat tab are placed at the bonding position where cold welding or stitch press bonding is performed. 2. The method of manufacturing an electrolytic capacitor according to claim 1, wherein the electrolytic capacitor manufacturing method is performed at a position at least a predetermined distance away from the user. (3) The method for manufacturing an electrolytic capacitor according to claim 2, characterized in that alcohol is continuously or intermittently dripped onto the punch or die used when drilling the flat tab. (4) After drilling the flat tab and before joining the flat tab by cold welding or stitch pressing, dry the dropped alcohol and perform brushing and suction to remove drilling debris or other foreign matter. The method for manufacturing an electrolytic capacitor according to claim 3.