Battery parameter estimation device and parameter estimation method
View Patent ↗An apparatus and method for battery parameter estimation estimate the parameters of a battery equivalent circuit model while reducing the computation load. The apparatus includes a charge/discharge current detector ( 3 ) that detects a charge/discharge current value of a battery ( 1 ); a terminal voltage detector ( 2 ) that detects a terminal voltage value of the battery ( 1 ); and an estimator ( 4 ) that estimates, based on the charge/discharge current value and the terminal voltage value, parameters in a battery equivalent circuit model ( 41 ) that approximates the Warburg impedance of the battery ( 1 ).
1. An apparatus for battery parameter estimation, the apparatus comprising:
a charge/discharge current detector configured to detect a charge/discharge current value of a battery;
a terminal voltage detector configured to detect a terminal voltage value of the battery; and
an estimator configured to estimate parameters in a battery equivalent circuit model that includes an approximate circuit of a Warburg impedance of the battery,
wherein the estimator estimates a diffusion resistance R d and a diffusion capacitance C d of the battery based on the charge/discharge current value and the terminal voltage value, and translates the estimated diffusion resistance R d and the estimated diffusion capacitance C d to the parameters.
2. The apparatus of claim 1 , wherein the estimator translates the estimated diffusion resistance R d and the estimated diffusion capacitance C d to the parameters based on approximate equations of the Warburg impedance.
3. The apparatus of claim 2 , wherein
the equivalent circuit model is an n-th order Foster equivalent circuit model, and
the estimator translates the estimated diffusion resistance R d and the estimated diffusion capacitance C d to the parameters with the following approximate equations:
C
n
=
C
d
2
R
n
=
8
R
d
(
2
n
-
1
)
2
π
2
.
4. The apparatus of claim 2 , wherein
the equivalent circuit model is an n-th order Cauer equivalent circuit model, and
the estimator translates the estimated diffusion resistance R d and the estimated diffusion capacitance C d to the parameters with the following approximate equations:
C
n
=
C
d
4
n
-
1
R
n
=
R
d
4
n
-
3
.
5. The apparatus of claim 1 , wherein the estimator estimates an internal state quantity of the battery at a same time as the parameters in the equivalent circuit model.
6. The apparatus of claim 2 , wherein the estimator estimates an internal state quantity of the battery at a same time as the parameters in the equivalent circuit model.
7. The apparatus of claim 3 , wherein the estimator estimates an internal state quantity of the battery at a same time as the parameters in the equivalent circuit model.
8. The apparatus of claim 4 , wherein the estimator estimates an internal state quantity of the battery at a same time as the parameters in the equivalent circuit model.
9. A method for battery parameter estimation, the method comprising:
detecting a charge/discharge current value of a battery;
detecting a terminal voltage value of the battery; and
estimating parameters in a battery equivalent circuit model that includes an approximation circuit approximating a Warburg impedance of the battery,
wherein estimating parameters comprises estimating a diffusion resistance R d and a diffusion capacitance C d of the battery based on the charge/discharge current value and the terminal voltage value, and translating the estimated diffusion resistance R d and the estimated diffusion capacitance C d to the parameters.