State-of-charge estimating device of secondary battery
First Claim
1. A state-of-charge estimating device for estimating a state-of-charge of a secondary battery connected to a load, comprising:
- a current detecting device for detecting a current I of the secondary battery;
a terminal voltage detecting device for detecting a terminal voltage V of the secondary battery; and
a controller receiving input from the current detecting device and the terminal voltage detecting device, the controller including;
an open-circuit voltage estimating part operable to perform an adaptive digital filter computing treatment to estimate at least one battery parameter in a battery model
1 Assignment
0 Petitions
Accused Products
Abstract
A state-of-charge (SOC) estimating device and method for a secondary battery that estimates the SOC of the battery with high precision when variation takes place in the parameters of the battery model, even if the input current is constant. A first SOC estimating part estimates the open-circuit voltage by estimating the battery parameters en bloc using an adaptive digital filter computing treatment from the measurement values of the current and the terminal voltage and computes a first estimated SOC of the secondary battery from the open-circuit voltage and a predetermined relationship between the open-circuit voltage and the SOC. A second SOC estimating part computes a second estimated SOC by means of current-integration. State-of-charge estimated value-selecting part selects the second SOC value as when the current is constant and otherwise selects the first SOC value.
-
Citations
27 Claims
-
1. A state-of-charge estimating device for estimating a state-of-charge of a secondary battery connected to a load, comprising:
-
a current detecting device for detecting a current I of the secondary battery; a terminal voltage detecting device for detecting a terminal voltage V of the secondary battery; and a controller receiving input from the current detecting device and the terminal voltage detecting device, the controller including; an open-circuit voltage estimating part operable to perform an adaptive digital filter computing treatment to estimate at least one battery parameter in a battery model - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A state-of-charge estimating device for estimating a state-of-charge of a secondary battery connected to a load, comprising:
-
means for detecting a current I through the secondary battery; means for detecting a terminal voltage V of the secondary battery; open-circuit voltage estimating means for performing an adaptive digital filter computing treatment to estimate at least one battery parameter in a battery model - View Dependent Claims (27)
-
-
26. A state-of-charge estimating method for estimating a state-of-charge of a secondary battery connected to a load, comprising:
-
detecting a current I through the secondary battery; detecting a terminal voltage V of the secondary battery; performing an adaptive digital filter computing treatment to estimate at least one battery parameter in a battery model
-
Specification