JP3023630B2 - Electric double layer capacitor - Google Patents

Abstract

PURPOSE:To improve thermal resistance of an electric dual layer capacitor in the conventional structure for avoiding the cracking in a mold resin. CONSTITUTION:This electric dual layer capacitor is characterized by the electrode structure, i.e., within a mold resin exterior type electric dual layer capacitor wherein an electrode sheet with the second lead terminal is arranged on the surface of an electric dual layer capacitor element 1 while another electric sheet 5 with hook functional lead terminal is arranged on the rear surface to be injection-molded by pressure-molding exterior resin 4, one electrode sheet with lead is provided with the lead terminal horizontal to the sheet to be extruded out of the resin exterior as well as a hook part vertical to the sheet not to be extruded out of the resin exterior. In such a constitution, no cracking occurs during the solder vessel dipping test at 260 deg.C for 5sec thereby enabling the reliability upon the quality to be notably enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric double layer capacitor, and more particularly to a resin-coated electric double layer capacitor with improved heat resistance.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional molded resin-coated electric double-layer capacitor has a plurality of stacked electric double-layer capacitor elements 1, one of which is horizontally connected to an electrode plate. The first electrode plate 2 with lead from which the lead was taken out, and the second electrode plate 3 with lead from which the other lead was taken out in the direction perpendicular to the electrode plate were arranged, and were laminated by applying a predetermined pressure. While the contact resistance between the inside of the electric double layer capacitor element and the electrode plate is kept low, it is injection-molded with a mold exterior resin to maintain the applied pressure.

[0003]

The above-described conventional electric double-layer capacitor with a molded resin package has a solder bath dip of 260 ° C. for 5 seconds and a second electrode plate 3 with lead terminals.
There is a problem that the exterior resin is cracked along.

[0004] It is an object of the present invention to provide an electric double layer capacitor in which the exterior resin is prevented from cracking along the second electrode plate with lead terminals in the solder bath dip, and the heat resistance reliability is improved. .

[0005]

The electric double layer capacitor of the present invention has a hook portion 6 bent in parallel with the second electrode plate 3 with lead terminals.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a perspective view of an electrode plate with a lead terminal with a hook function according to an embodiment of the present invention. 8m vertically / horizontally on the upper surface of the electric double layer capacitor element 1.
A second electrode plate 3 with a lead terminal having a thickness of 0.2 m / m and a thickness of 0.2 m / m is disposed on the lower surface of the second electrode plate 5 with a hook function.

Next, in order to reduce the contact resistance of the electric double layer capacitor, the second electrode plate 3 with lead terminals and the electrode plate 5 with lead terminals with hook function are vertically moved at a pressure of 10 to 50 kg / cm ^2. Injection molding is performed with the mold exterior resin 4 in a state where it is pressurized and bent so as to maintain insulation between the hook portion 6 and the second electrode plate 3 with lead terminals.

At this time, the vertical pressing force of the electric double layer capacitor element 1 confined in the molded exterior resin is controlled by the electrode plate 5 with a lead terminal with a hook function, the second electrode plate 3 with a lead terminal, and the hook 6. Firmly held between

In the conventional electric double layer capacitor with a mold resin exterior, when molded using a material having a mold resin strength of 1280 kg / cm ² , when a load is applied upward from the soldering surface side of the electric double layer capacitor 1 to 580 kg / cm ^2. c
m ² (normal temperature), 140 kg / cm ² (260 ° C.-5 sec.)
c), each crack occurs. This is because the internal pressure due to thermal expansion of the electric double layer capacitor element 1 increases.

However, by providing the electrode structure shown in one embodiment, the hook portion is applied to a portion where the mold exterior resin cracks, and the strength of the resin including the hook portion 6 is changed from the single strength of the mold resin. As a result, the strength after 260 ° C. for 5 sec was 280 kg / cm ² .

[0011]

As described above, the molded resin-coated electric double layer capacitor of the present invention has a hook portion bent horizontally with respect to the second electrode plate with lead terminals. Has the effect of preventing the exterior resin from breaking along the second electrode plate with lead terminals.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a perspective view of an electrode plate with a hook function and a lead terminal used in the embodiment of the present invention shown in FIG. 1;

FIG. 3 is a perspective view of a second electrode plate with lead terminals used in the embodiment of the present invention shown in FIG. 1;

FIG. 4 is a sectional view of an example of a conventional resin-coated electric double-layer capacitor.

5 is a perspective view of an electrode terminal used in the conventional example of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric double layer capacitor element 2 1st electrode plate with a lead terminal 3 2nd electrode plate with a lead terminal 4 Mold exterior resin 5 Electrode plate with a lead terminal with a hook function 6 Hook part 7 Crack generation place

Claims (1)

(57) [Claims] An electric double layer capacitor element (1) formed by stacking a plurality of electric double layer capacitor cells, and one end and the other end of the electric double layer capacitor element (1) in the stacking direction of the electric double layer capacitor cells. First and second electrode plates with lead terminals (5 and 3) arranged in contact with each other
And an electric double layer having a resin outer casing (4) formed by pressure molding so as to cover the electric double layer capacitor element (1) and the first and second electrode plates with lead terminals (5 and 3). In the capacitor, the first and the previous
The second electrode plates with lead terminals (5 and 3) are
Extending substantially parallel to a predetermined virtual plane,
The lead terminals with the electrode plate (5), said at resin sheathing (4) in said substantially parallel to the virtual plane, and stacking direction even substantially parallel of the electric double layer capacitor cell, the electric double The multilayer capacitor element (1) and the second electrode plate with lead terminals (3) are separated from each other at a distance from the multilayer capacitor element (1) and extend beyond the second electrode plate with lead terminals (3), and then bent;
Furthermore, substantially parallel to the virtual plane and substantially parallel with respect to the plate surface of the second lead terminals with the electrode plate (3), the second lead terminals with the electrode plate (3) is An electric double-layer capacitor comprising a hook portion extending at a distance.