Battery parameter estimation device and parameter estimation method

Patent metadata

Field	Value
Publication number	US-2016252585-A1
Application number	US-201415030658-A
Country	US
Kind code	A1
Filing date	Oct 3, 2014
Priority date	Oct 21, 2013
Publication date	Sep 1, 2016
Grant date	—

Abstract

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 ).

First claim

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, based on the charge/discharge current value and the terminal voltage value, parameters in a battery equivalent circuit model that approximates a Warburg impedance of the battery.

2 . The apparatus of claim 1 , wherein the estimator estimates at least a diffusion resistance R d and a diffusion capacitance C d by approximation 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 calculates the parameters with the following 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 calculates the parameters with the following 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, based on the charge/discharge current value and the terminal voltage value, parameters in a battery equivalent circuit model that approximates a Warburg impedance of the battery.

Assignees

• Calsonic Kansei Corp
• Univ Keio
• Univ Kyoto

Inventors

• Baba Atsushi
• Adachi Shuichi
• Maruta Ichiro

Classifications

• H02J7/84

  Control of state of health [SOH] · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• G01R31/3662 Primary

  Physics · mapped topic

• G01R31/3648

  comprising digital calculation means, e.g. for performing an algorithm · CPC title