SECONDARY BATTERY CHARGE STATE ESTIMATION METHOD AND SECONDARY BATTERY CHARGE STATE ESTIMATION DEVICE

• Main Authors: IOKU YASUYUKI, RIYUUJI MAKOTO, JO MASAYA
• Format: Patent
• Language: English; Japanese
• Published: 23.06.2016
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

PROBLEM TO BE SOLVED: To provide a secondary battery charge state estimation method and a secondary battery charge state estimation device having high estimation accuracy.SOLUTION: A method for estimating a charge state of a secondary battery on the basis of an open voltage value and a current integrated value, comprises updating an instantaneous charge state map defining a relation between an instantaneous open voltage value and a charge state estimation value at a time of estimating the charge state on the basis of charge/discharge characteristic data after start of using the secondary battery; calculating the instantaneous charge state estimation value at the time of estimating the charge state; calculating a charge state estimation value on the basis of an integrated value of a current flowing in the secondary battery; and calculating a control charge state estimation value for used in control over the secondary battery on the basis of the charge state estimation value based on the instantaneous charge state estimation value and the current integrated value.SELECTED DRAWING: Figure 2 【課題】推定精度の高い二次電池の充電状態推定方法および推定装置を提供する。【解決手段】二次電池の充電状態を、開放電圧値および電流積算値に基づいて推定する方法において、充電状態推定時の瞬間的な開放電圧値と充電状態推定値との関係を定める瞬時充電状態マップを、前記二次電池の使用開始後の充放電特性データに基づいて更新し、前記更新された瞬時充電状態マップに基づいて、充電状態推定時の瞬間的な充電状態推定値を算出し、前記二次電池を流れた電流の積算値に基づいて、充電状態推定値を算出し、前記瞬間的な充電状態推定値および前記電流積算値に基づく充電状態推定値に基づいて、前記二次電池の制御に用いる制御用充電状態推定値を算出する。【選択図】図２