JPS6038284Y2 - Multilayer electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a multilayer electrolytic capacitor, and in particular provides a structure that prevents cracking and breakage of electrode foil and reduces variations in characteristics.

Electrode foils used in electrolytic capacitors are usually very brittle, and when stacked in multiple layers and mechanically bonded or welded, the multilayer structure may cause partial strain, causing cracks or breakage. However, it has the disadvantage that cracks are likely to occur particularly near the crimped part of the lead wire lead-out part.

The present invention aims to improve this, and the present invention will be explained with reference to an embodiment shown in the figure below. 1 is an electrode foil used for a laminated element, and the electrode foil 1 is divided into a lead-out part a and an effective electrode part,
Along the line that separates the two, one end is left open and an eave part 2 is formed by a deep notch, an L-shaped external lead electrode 3 is formed, and a small hole 4 for positioning is bored in the end.

As shown in FIG. 2, the electrode foil 1 is stacked in the order of electrolytic paper 5, anode foil 1p, electrolytic paper 5, and cathode foil 1n from above, and these are used as one unit element, and a plurality of elements are stacked and laminated.

FIG. 3 is a top view of the same element, and the positional relationship between the anode foil 1p and the electrolytic paper 5 is such that the electrolytic paper 5 is slightly larger than the effective electrode part with respect to the electrode foil 1, as shown by the dotted line in the illustration. The external extraction electrodes 3 are stacked on top of each other so as to be located on the outside thereof.

The electrode foils laminated in the above manner are crimped on the external lead electrode part 3 side as shown in Fig. 4, mechanically caulked or welded, and then attached directly to the external lead lead or external case. Secure by caulking or welding.

As explained above, when compressing the external lead-out electrode 3 of the electrode foil 1 and performing mechanical caulking or welding processing, the eaves part 2 is formed on the line that separates the external lead-out part a and the effective electrode part. As a result, stress applied to the same part can be avoided, and even if several extremely fragile electrode foils 1 are laminated and crimped together, no cracks or breakage will occur as in the conventional type.

In this way, stress applied to the electrode foil 1 partially is avoided and distortion is prevented, and by separating the lead-out part a and the effective electrode part, it becomes easy to align the opposing areas of the anode and cathode sides to a constant value. , the variation in properties of finished products can be reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of an electrode foil of a multilayer electrolytic capacitor showing an embodiment of the present invention, FIG. 2 is a side view of one unit element of the multilayer electrolytic capacitor, FIG. 3 is a plan view, and FIG.
The figure is a side view of a multilayer element of an electrolytic capacitor. In the figure, 1...electrode foil, 2...clothing eaves section,
3...External extraction electrode, 4...Small hole,
5... Electrolytic paper, 1p... Anode foil, 1n
...Cathode foil.

Claims (1)

[Scope of utility model registration request] In an electrolytic capacitor in which an anode foil and a cathode foil are laminated with electrolytic paper interposed therebetween, an L-shaped external lead-out electrode is formed by forming an eaves part of a required length on each electrode foil to separate an effective electrode part and a lead-out part. A multilayer electrolytic capacitor characterized by the following: