(19)

(11)

EP 0 406 295 A1

(12)

(43) Date of publication: 09.01.1991 Bulletin 1991/02 (21) Application number: 89904166.0 (22) Date of filing: 23.03.1989

(51) International Patent Classification (IPC):  H01M 10/ 50( . ) (86) International application number: PCT/GB1989/000310 (87) International publication number: WO 1989/009497 (05.10.1989 Gazette 1989/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 25.03.1988 GB 19880007217 (71) Applicant: THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN London SW1A 2HB (GB)	(72) Inventors: ATTEWELL, Austin Fleet Hampshire GU13 9PP (GB) FAUL, Ian Farnham Surrey GU9 ORH (GB) KNIGHT, John Farnborough Hampshire GU14 6NL (GB) (74) Representative: Beckham, Robert William  Defence Research Agency Intellectual Property Department DRA Farnborough R69 Building Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)