Nec Corporation

Munekazu Aoki

Keitaro Katsu

Masako Inagawa

Yoshinori Sekiguchi

Kazuhiko Sato

A stack type electric double layer capacitor includes a plurality of unit cells, each with a pair of polarizing electrodes facing each other across a porous separator, a pair of current collecting members, and a gasket surrounding the electrodes and current collecting members. The gasket has a heat radiation notch in the direction parallel to or perpendicular to the stacking direction. This prevents heat from accumulating in the capacitor at the time of rapid charge and discharge, and thereby enhances the reliability of the capacitor.

Electric double layer capacitor

A chip type electronic part of the present invention includes tapered notches rising from the bottom of the body of a molding. With this configuration, the electronic part achieves a high volume efficiency and a great bonding strength to a circuit board after soldering.

Chip type electronic part

An electric double-layer capacitor is provided, which decreases the number of necessary components to improve the productivity of the capacitor. The capacitor includes at least one basic cell. Each of the at least one basic cell has (a) an insulative, tubular gasket having a tubular inner space and opening ends, (b) a pair of polarizable electrodes made of a solid activated-carbon, (c) a sheet-like, porous, non electron-conductive separator sandwiched between the pair of electrodes; and (d) a pair of conductive, sheet-like collectors placed to close the opening ends of the gasket. The pair of collectors are electrically connected to a pair of external terminals. The pair of electrodes and the separator are placed in the inner space of the gasket. The gasket is made of a thermoplastic resin and is formed by injection molding. The separator and the pair of electrodes are unified with the gasket. The unification of the separator and the pair of electrodes with the gasket is performed during the molding process of the gasket.

Electric double-layer capacitor

A basic cell for an electric double layer capacitor has a pair of polarizing electrodes each including a plurality of chip electrodes arranged in matrix or honeycomb pattern. The plurality of chip electrodes are electrically connected by direct contact between each adjacent two chip electrodes for increasing the capacitance and decreasing the internal resistance. Excellent charging or discharging characteristic can be obtained even if the sheet collectors for providing charging or discharging current for the chip electrodes have different specific resistivities along the surface of the sheet collectors. The chip electrodes may be of a truncated pyramid shape for improving resistance against distorting or bending stress applied to the basic cell.

Basic cell for an electric double layer capacitor

An electric double layer capacitor including a pair of activated charcoal electrodes facing each other with the intermediary of a porous separator, and current collecting members each being positioned on a surface of the respective electrode opposite to a surface contacting the separator is disclosed. Hydrophobic powdery activated charcoal is provided around the electrodes for adsorbing gases. With this arrangement, it is possible to prevent pressure inside the capacitor from being elevated by gases produced in the capacitor, thereby enhancing the reliability of the capacitor.

Electric double layer capacitor having hydrophobic powdery activated

A pair of electrode plates each having a lead terminal, which are disposed on opposite polar faces of a stacked electric double layer capacitor element, are made of a stainless steel plate or 42% nickel-iron steel plate, whereby a thickness of the electrode plate is reduced as compared with that in SPCC and thus a thickness of the capacitor is shrunk.

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Tokyo, Japan

Munekazu Aoki