公开(公告)号：EP1505401A4

公开(公告)日：2007-03-28

申请号：EP03725717

申请日：2003-04-30

Applicant: SONY CORP

Inventor： YAMAZAKI KAZUO ,  HATAZAWA TSUYONOBU ,  TOMITA TAKASHI ,  IKEDA TAMON ,  NAWA RYUICHI ,  ISHIKAWA YUUICHI ,  HORI MASANORI

IPC: G01R31/36 ,  H01M10/48

CPC classification number: G01R31/3679 ,  G01R31/362 ,  G01R31/3648 ,  G01R31/3675

Abstract: A battery capacity calculation methods includes a reference discharge curve calculation step for obtaining a discharge curve as a reference, a correction voltage calculation step for correcting the battery measurement voltage (V1) by a battery resistance component so as to obtain a corrected voltage (V), and a capacity calculation step for calculating the battery discharge capacity from the discharge curve serving as the reference by using the corrected voltage (V). The capacity calculation step has a deterioration index calculation step for calculating a capacity deterioration index (S) as a capacity reduction ratio attributed to battery deterioration. The discharge capacity calculated from the discharge curve as the reference by using the corrected voltage (V) is further multiplied by the capacity deterioration index (S), thereby calculating a discharge capacity.