A electric storage device that includes a device body having a first end face that has a first portion and a second portion, and second end face that has a third portion and a fourth portion. The second portion is inclined relative to the first portion, and the fourth portion is inclined relative to the third portion. A first electrode film extends from the first portion to the second portion, and a second electrode film extends from the third portion to the fourth portion.

A electric storage device that includes a device body having a first end face that has a first portion and a second portion, and second end face that has a third portion and a fourth portion. The second portion is inclined relative to the first portion, and the fourth portion is inclined relative to the third portion. A first electrode film extends from the first portion to the second portion, and a second electrode film extends from the third portion to the fourth portion.

An electrically conductive porous composite composed of an expanded microsphere matrix binding a material composition having electrical conductivity properties to form an electrically conductive porous composite is disclosed herein. An energy storage device incorporating the electrically conductive porous composite is also disclosed herein.

An electrically conductive porous composite composed of an expanded microsphere matrix binding a material composition having electrical conductivity properties to form an electrically conductive porous composite is disclosed herein. An energy storage device incorporating the electrically conductive porous composite is also disclosed herein.

An electrical storage device includes a case having first and second opposed main walls which face one another and at least one side wall coupled the first and second main walls. The case having a generally rectangular shape with outer corners and includes a cutout part having inner corners. An integrated electrode body is located in the case and is joined to the first main wall. The integrated body includes a first electrode, a second electrode, and a separator disposed between the first and second electrodes. The electrode body has a bending strength which is higher than a bending strength of the first main wall. An electrolyte fills the case.

An electrical storage device includes a case having first and second opposed main walls which face one another and at least one side wall coupled the first and second main walls. The case having a generally rectangular shape with outer corners and includes a cutout part having inner corners. An integrated electrode body is located in the case and is joined to the first main wall. The integrated body includes a first electrode, a second electrode, and a separator disposed between the first and second electrodes. The electrode body has a bending strength which is higher than a bending strength of the first main wall. An electrolyte fills the case.

An integrated energy storage device is provided that includes a supercapacitor and a battery surrounding the supercapacitor. The battery forms a shell around an exterior surface of the supercapacitor. The battery includes a first anode, a first cathode, and an electrolyte disposed between the first anode and the first cathode. The supercapacitor includes a second anode, a second cathode, and a separator disposed between the second anode and the second cathode.

An energy bank is provided that includes a plurality of integrated energy storage devices comprising a plurality of supercapacitors, a plurality of batteries and a plurality of metal shells. Each of the integrated energy storage devices comprises a supercapacitor, a battery surrounding the supercapacitor and a metal shell surrounding the battery. The battery forms a shell around an exterior surface of the supercapacitor. The battery includes a first anode, a first cathode, and an electrolyte disposed between the first anode and the first cathode. The supercapacitor includes a second anode, a second cathode, and a separator disposed between the second anode and the second cathode.

Embodiments herein describe techniques for a semiconductor device including a three dimensional capacitor. The three dimensional capacitor includes a pole, and one or more capacitor units stacked around the pole. A capacitor unit of the one or more capacitor units includes a first electrode surrounding and coupled to the pole, a dielectric layer surrounding the first electrode, and a second electrode surrounding the dielectric layer. Other embodiments may be described and/or claimed.

An electrode element (1) for an energy storage unit (200), such as a capacitor, has an electrode body (100) made of an active electrode material (E), wherein the electrode body (100) includes one or more of: at least one cavity (110) on its surface or in its interior; at least one partial volume (120) of lower density; and/or a surface coating (D) covering at least a portion of the surface of the electrode body (100), such that the surface area covered by the surface coating (D) remains unwetted when in contact with an electrolyte. Energy storage units (200) incorporating the electrode element (1) are particularly suitable for use in implantable electrotherapeutic devices.