Patent ID: 8674702
Filing Date: 2014-03-18
Classification: B60L,G01R,H01M,Y02E,Y02T

Abstract:
1. An apparatus for detecting a state of a secondary battery having a positive electrode and a negative electrode, comprising: a first detection unit using a potential of a metallic casing of said secondary battery insulated from said positive electrode and said negative electrode as a reference potential to detect a potential difference between said reference potential and a potential of said positive electrode as a detected positive electrode potential difference; a second detection unit using said potential of said metallic casing as a reference potential to detect a potential difference between said reference potential and a potential of said negative electrode as a detected negative electrode potential difference; a first calculation unit calculating a state of charge of said secondary battery; a second calculation unit calculating a normal positive electrode potential difference and a normal negative electrode potential difference based on said state of charge of said secondary battery, said normal positive electrode potential difference indicating a potential difference between said reference potential and a potential of said positive electrode that is provided when said positive electrode is normal, said normal negative electrode potential difference indicating a potential difference between said reference potential and a potential of said negative electrode that is provided when said negative electrode is normal; and an abnormality detection unit for comparing said detected positive electrode potential difference with said normal positive electrode potential difference and determining that said positive electrode is abnormal when said detected positive electrode potential difference and said normal positive electrode potential difference have a difference exceeding a first predetermined range and for comparing said detected negative electrode potential difference with said normal negative electrode potential difference and determining that said negative electrode is abnormal when said detected negative electrode potential difference and said normal negative electrode potential difference have a difference exceeding a second predetermined range.