Battery state estimating device

摘要: PROBLEM TO BE SOLVED: To provide a battery state estimating device precisely even for batteries having plateau area in an SOC-OCV map. SOLUTION: The 100 estimates state, where the map changes from high SOC side deterioration, while 200 has plurality of stages areas. includes: information storage section 130 storing capacity each area; open-circuit voltage estimation 110 OCV; determination 120 determining to which OCV belongs; current sensor 140 detecting charge/discharge current; amount-of-charge/discharge calculation 150 calculating amount at prescribed and 161 estimating, as capacity, sum lower than it been determined that belongs calculated by to, stored section. COPYRIGHT: (C)2011,JPO&INPIT