Battery measuring device, battery control system and vehicle
A battery measuring device includes 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−AC resistance value, and which estimates at least an internal resistance of the secondary battery using the temperature T 1 , electric resistance Re 1 and reaction resistance Rc 1.
1. 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.
2. A battery control system comprising:
a battery measuring 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 ; and
a deterioration determining unit which determines a deterioration condition of the secondary battery based on the reaction resistance Rc 1 .
3. The battery control system according to claim 2 , wherein in the battery measuring device
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 )}.
4. The battery control system according to claim 3 , wherein in the battery measuring device
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.
5. The battery control system according to claim 4 , wherein in the battery measuring device
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 ).
6. The battery control system according to claim 5 , wherein in the battery measuring device
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.
7. A battery control system 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,
a temperature adjusting device which adjusts temperature of the secondary battery; and
a temperature control unit which has the temperature adjusting device warm the secondary battery until the maximum output power P (T) reaches the predetermined reference value.
8. A vehicle comprising a battery control system comprising:
a battery measuring 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 ; and
a deterioration determining unit which determines a deterioration condition of the secondary battery based on the reaction resistance Rc 1 ,
wherein the vehicle operates by power supplied from the secondary battery.
9. A vehicle comprising 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,
wherein the vehicle operates by power supplied from the secondary battery.
10. A vehicle comprising a battery control system 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,
a temperature adjusting device which adjusts temperature of the secondary battery; and
a temperature control unit which has the temperature adjusting device warm the secondary battery until the maximum output power P (T) reaches the predetermined reference value,
wherein the vehicle operates by power supplied from the secondary battery.