An electric double layer capacitor device

Abstract

An electric double layer capacitor (EDLC) device (1) for reflow soldering to a printed circuit board (PCB) (2). Device (1) includes a cylindrical thin-walled malleable aluminium housing (3) that extends between an open end (5) and a closed end (6). Housing (3) defines a circular opening (7) adjacent to end (5) and a cylindrical cavity (8) that extends away from opening (7) and which terminates at end (6). A cylindrical capacitor element (9) is received complementarily in cavity (8) and includes two carbon-based electrodes (11, 12). A separator, in the form of two elongate paper-based separator sheets (13, 14) are alternated, and spiral wound together with electrodes (11, 12). Sheets (13, 14) maintain electrodes (11, 12) in a spaced apart and opposed configuration. An electrolyte impregnates electrodes (11, 12) as well as sheets (13, 14) and is contained within cavity (6) for allowing ionic conduction between electrodes (11, 12). The electrolyte has at 1 atm a freezing point of less than 0° C. and a boiling point of more than 200° C. A sealing element, in the form of a rubber lid (15), extends over and seals opening (7). Two terminals (17, 18), in use, each extend between a first end (19) disposed in cavity (8) and a second end (20) disposed externally to cavity (8). Ends (19) are electrically connected to the respective electrodes (11, 12), and terminals (17, 18) extend through opening (7) such that ends (20) are available for electrical connection to PCB (2).

Dependencies are inferred from the claim text.