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EP 1 856 750 A2

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(43) Date of publication: 21.11.2007 Bulletin 2007/47 (21) Application number: 06720777.9 (22) Date of filing: 15.02.2006

(51) International Patent Classification (IPC):  H01M 2/18(2006.01) H01M 2/08(2006.01) H01M 2/16(2006.01) H01M 10/26(2006.01) (86) International application number: PCT/US2006/005339 (87) International publication number: WO 2006/088959 (24.08.2006 Gazette 2006/34)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK YU (30) Priority: 15.02.2005 US 58665 15.02.2005 US 58678 (71) Applicant: Rovcal, Inc. Madison, WI 53711 (US)

(72) Inventors: MORTENSEN, Erik Sun Prairie, WI 53590 (US) JIN, Zhihong Cottage Grove, WI 53527 (US) VU, Viet, H. Verona, WI 53593 (US) BUSHONG, William C. Madison, WI 53705 (US) RAMASWAMI, Karthik Middleton, WI 53562 (US) KREN, Kevin 601 Rayovac Drive, Madison, WI 53711 (US) DAVIDSON, Gregory J. Oregon, WI 53575 (US) (74) Representative: Davies, Christopher Robert  Frank B. Dehn & Co. St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)