A multi-fold rechargeable battery cell structure comprising electrode elements and separator elements, wherein relief slots are formed along the fold axes of the outermost electrode elements in order to relieve folding stresses which could result in damage and impairment of the operation of the cell....http://www.google.co.uk/patents/US6482540?utm_source=gb-gplus-sharePatent US6482540 - Multi-fold rechargeable battery cell structure
