Patent ID: 8489264

Claim:
A battery control device comprising: a temperature measuring unit which measures temperature T 1 of a secondary battery; a resistance measuring unit which measures an AC resistance value and a DC pulse resistance value of a first discharging period of the secondary battery at the temperature T 1 ; and an estimating unit in which an electric resistance Re 1 and a reaction resistance Rc 1 of the secondary battery at the temperature T 1 are considered as, Re 1 =AC resistance value Rc 1 =DC pulse resistance value of the first discharging period minus AC resistance value, and which estimates at least an internal resistance of the secondary battery using the temperature T 1 , the electric resistance Re 1 and the reaction resistance Rc 1 , wherein the estimating unit uses constants EC and EE specific to the secondary battery to estimate an electric resistance Re (T) and a reaction resistance Rc (T) of the secondary battery at an arbitrary temperature T as, Re ( T )= Re 1×{exp(− EE/RT 1)/exp(− EE/RT )} Rc ( T )= Rc 1×{exp(− EC/RT 1)/exp(− EC/RT )}, wherein the resistance measuring unit measures a DC pulse resistance value of a second discharging period which is longer than the first discharging period of the secondary battery at the temperature T 1 , and the estimating unit estimates a diffusion resistance Rd of the secondary battery at the temperature T 1 as, Rd=DC pulse resistance value of the second discharging period minus DC pulse resistance value of the first discharging period, and an internal resistance R (T) of the secondary battery at the arbitrary temperature T as, R ( T )= Re ( T )+ Rc ( T )+ Rd, wherein the estimating unit uses an open circuit voltage Voc and a minimum value Vmin of a usable voltage range of the secondary battery to estimate a maximum output power P (T) of the secondary battery at the temperature T as, P ( T )= V min×( Voc−V min)/ R ( T ), wherein the estimating unit determines that, in a case where the maximum output power P (T) is smaller than a predetermined reference value, the secondary battery does not satisfy necessary power output, an alert notifying unit which issues an alert in a case where the maximum output power P (T) is determined as unable to satisfy the predetermined reference value.