A battery cell includes an electrode assembly, a tab, a first connecting piece, and a second connecting piece. The electrode assembly includes a first end face and a second end face that are disposed opposite to each other, and a first surface and a second surface that are connected to the first end face and the second end face respectively. The tab protrudes from first end face. The first connecting piece surrounds the first end face and is connected to the first surface and the second surface separately. A first via hole is made on the first connecting piece. The tab is threaded out of the first via hole. The second connecting piece surrounds the second end face and is connected to the first surface and the second surface separately. A plurality of second via holes are made on the second connecting piece.

A blank suitable for use as a body of a supercapacitor comprises a first porous semiconductor volume and a second porous semiconductor volume, the second porous semiconductor volume laterally surrounded by the first porous semiconductor volume and separated from it by a trench that is suitable for receiving an electrolyte, whereby the first and second porous semiconductor volume comprise channels opening to the trench. A supercapacitor comprises a body formed by using the blank according to any one of the preceding claims, so that the first porous semiconductor volume acts as one electrode and the second porous semiconductor volume acts as another electrode, with an electrolyte in the trench.

A blank suitable for use as a body of a supercapacitor comprises a first porous semiconductor volume and a second porous semiconductor volume, the second porous semiconductor volume laterally surrounded by the first porous semiconductor volume and separated from it by a trench that is suitable for receiving an electrolyte, whereby the first and second porous semiconductor volume comprise channels opening to the trench. A supercapacitor comprises a body formed by using the blank according to any one of the preceding claims, so that the first porous semiconductor volume acts as one electrode and the second porous semiconductor volume acts as another electrode, with an electrolyte in the trench.

In an embodiment an electrolytic capacitor includes a capacitor element being housed by a can. A covering element is configured to close an opening of the can. A connection element comprises an external terminal for applying an electrical signal and a lead tab being electrically coupled to the capacitor element and to the external terminal. The connection element comprises an upper washer and a lower washer respectively having an opening to receive a rivet to fix the external terminal and the lead tab to the covering element. The upper washer is configured to either comprise a cavity to receive a head of the rivet or a protrusion or a tapered lateral surface.

This method for producing porous sintered aluminum includes: mixing aluminum powder with a sintering aid powder containing titanium to obtain a raw aluminum mixed powder; mixing the raw aluminum mixed powder with a water-soluble resin binder, water, and a plasticizer containing at least one selected from polyhydric alcohols, ethers, and esters to obtain a viscous composition; drying the viscous composition in a state where air bubbles are mixed therein to obtain a formed object prior to sintering; and heating the formed object prior to sintering in a non-oxidizing atmosphere, wherein when a temperature at which the raw aluminum mixed powder starts to melt is expressed as Tm (° C.), a temperature T (° C.) of the heating fulfills Tm−10 (° C.)≤T≤685 (° C.).

This undercoat foil for an energy storage device electrode comprises a collector base plate, and an undercoat layer formed on at least one surface of the collector base plate, the undercoat layer containing carbon nanotubes, and the coating amount per collector base plate surface being 0.1 g/m.sup.2 or less. Since this undercoat foil can be effectively welded by ultrasound, the use thereof allows a low-resistance energy storage device and a simple and effective production method therefor to be provided.

This undercoat foil for an energy storage device electrode comprises a collector base plate, and an undercoat layer formed on at least one surface of the collector base plate, the undercoat layer containing carbon nanotubes, and the coating amount per collector base plate surface being 0.1 g/m.sup.2 or less. Since this undercoat foil can be effectively welded by ultrasound, the use thereof allows a low-resistance energy storage device and a simple and effective production method therefor to be provided.

A power storage apparatus includes an electrode assembly and a case for accommodating the electrode assembly. The power storage apparatus has a covering member that is arranged between the case and the electrode assembly to cover at least part of the electrode assembly. The covering member has an extending portion that extends in the protruding direction of the electrode terminals from one of the edges of the electrode assembly that is opposed to the electrode terminals. The coefficient of friction between the covering member and the electrode assembly is greater than the coefficient of friction between the case and the covering member.

A power storage apparatus includes an electrode assembly and a case for accommodating the electrode assembly. The power storage apparatus has a covering member that is arranged between the case and the electrode assembly to cover at least part of the electrode assembly. The covering member has an extending portion that extends in the protruding direction of the electrode terminals from one of the edges of the electrode assembly that is opposed to the electrode terminals. The coefficient of friction between the covering member and the electrode assembly is greater than the coefficient of friction between the case and the covering member.

The present invention relates to a lithium-sulfur ultracapacitor including a cathode containing a sulfur-porous carbon composite material; a separator; a lithium metal electrode disposed on an opposite side of the cathode with respect to the separator; a graphite-based electrode disposed adjacent to the lithium metal electrode; and an electrolyte impregnating the cathode, the lithium metal electrode, and the graphite-based electrode, wherein the lithium metal electrode and the graphite-based electrode together constitute an anode, and a method of preparing the lithium-sulfur ultracapacitor. According to the present invention, since the lithium metal electrode and the graphite-based electrode are adjacent to each other, lithium ions arising from the lithium metal electrode are pre-doped on the graphite-based electrode due to an internal short circuit between the lithium metal electrode and the graphite-based electrode, migrate from the graphite-based electrode to the cathode during a discharging process, and migrate from the cathode to the graphite-based electrode during a charging process, and such migrations contribute to excellent charging and discharging properties of the lithium-sulfur ultracapacitor.