EP2697884A1
EP2697884A1 EP12722774.2A EP12722774A EP2697884A1 EP 2697884 A1 EP2697884 A1 EP 2697884A1 EP 12722774 A EP12722774 A EP 12722774A EP 2697884 A1 EP2697884 A1 EP 2697884A1 Authority EP European Patent Office Prior art keywords switch cell primary cells battery Prior art date 2011-04-11 Legal status (The legal status …