Samsung Sdi Co., Inc.

Postech Research and Business Development Foundation

Giheon Kim

Jake Kim

Byeonghui Lim

Christober Rayappan

Yongjun Hwang

Sungwook Paek

Sangwoo Kim

Minjeong Kang

Minhwan Seo

Youngbin Song

A method of estimating a state of charge of a battery, includes: generating a present voltage value V(k) and a present current value I(k) by detecting a voltage and a current of the battery; determining a reference open-circuit voltage value V(k) based on a state-of-charge estimation value SOC(k); estimating first to third parameter values α(k), α(k), and α(k) from the present voltage value V(k), the reference open-circuit voltage value V(k), the present current value I(k), and a previous current value I(k−1) by using recursive least squares (RLS); and determining, using an extended Kalman filter (EKF), a next state-of-charge estimation value SOC(k+1) of the battery from the state-of-charge estimation value SOC(k), the present voltage value V(k), the reference open-circuit voltage value V(k), the present current value I(k), the previous current value I(k−1), and the first to third parameter values α(k), α(k), and α(k).

Method of estimating state of charge of battery

A method for detecting an abnormal battery cell includes periodically generating a voltage value and a current value for each of battery cells, updating, in real time by using an adaptive filter, a G parameter value and an H parameter value of each of battery cells, based on the voltage value and the current value, calculating a representative G parameter value and a representative H parameter value, and determining whether each of the battery cells is an abnormally deteriorated cell based on the G parameter value and the H parameter value of each of the battery cells, the representative G parameter value, and the representative H parameter value. The G parameter indicates sensitivity of voltage with respect to a change in current of the battery cell, and the H parameter indicates an effective potential determined by a local equilibrium potential distribution and a resistance distribution in the battery cell.

Method for detecting abnormal battery cell

Provided is a method of estimating the state of health of the battery according to various embodiments. The method of estimating the state of health of the battery comprises: measuring a voltage and current of a battery in use to periodically generate a voltage value and a current value; using an adaptive filter to periodically update a G parameter value and an H parameter value in real time from the voltage value and the current value, said parameters indicating the present state of the battery; and using an initial value and a final value of the G parameter that is preset and a present value of the G parameter to estimate the state of health of the battery in real time. The G parameter is a parameter that represents the sensitivity of the voltage to changes in the current of the battery, and the H parameter is a parameter that represents an effective potential determined by the local equilibrium potential distribution and resistance distribution inside the battery.

Method for estimating state of health of battery

An internal short-circuit cell detection method includes detecting a voltage and current of each of a plurality of battery cells, updating in real time G and H parameter values by using an adaptive filter, calculating a G parameter representative value, and calculating an H parameter representative value, and determining whether a short circuit occurs in each of the plurality of battery cells, based on the G and H parameter value of each of the plurality of battery cells, the G parameter representative value, and the H parameter representative value. The G parameter is a parameter indicating a sensitivity of a voltage to a change in current of each of the plurality of battery cells, and the H parameter is a parameter indicating an effective potential determined by a local equilibrium potential distribution and a resistance distribution in each of the plurality of battery cells.

Method for detecting internal short-circuited cell

A battery state estimation method includes: periodically measuring voltage and current of a battery in use to generate a voltage value and a current value; using an adaptive filter to generate a G parameter value for a G parameter and an H parameter value for an H parameter in real time from the voltage value and the current value, the G and H parameters indicating a present state of the battery; and using the G parameter value and the H parameter value to estimate the present state of the battery in real time. The G parameter is a parameter that represents sensitivity of the voltage to changes in the current of the battery, and the H parameter is a parameter that represents an effective potential determined by local equilibrium potential distribution and resistance distribution inside the battery.

Growing community of inventors

Yongin-si, South Korea

Giheon Kim