CHARGE-RATE ESTIMATION APPARATUS

• Main Authors: GOTO TETSUYA, UEDA KENJI, MATSUI HIROHITO
• Format: Patent
• Language: English; Japanese
• Published: 25.07.2016
• 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 charge-rate estimation apparatus for accurately estimating a charge rate of a secondary battery during charging/discharging during which a current is being carried to the secondary battery.SOLUTION: A charge-rate estimation apparatus 39 for estimating a charge rate of a secondary battery 10, comprises: a current sensor 35 that detects a charge/discharge current; a voltage sensor 36 that detects a terminal voltage; a heat flux sensor S that detects a heat flux toward outside of the secondary battery 10; and a charge-rate estimation unit 38 that calculate a heating value of the secondary battery 10 on the basis of a detection value by the heat flux sensor S, calculates an open end voltage of the secondary battery 10 on the basis of the charge/discharge current, the terminal voltage, and the heating value, and estimates the charge rate of the secondary battery 10 on the basis of the open end voltage.SELECTED DRAWING: Figure 4 【課題】二次電池に電流が流れている充放電中において、二次電池の充電率を精度よく推定する充電率推定装置を提供する。【解決手段】二次電池１０の充電率を推定する充電率推定装置３９であって、充放電電流を検出する電流センサ３５と、端子間電圧を検出する電圧センサ３６と、二次電池１０の外部へ向かう熱流束を検出する熱流束センサＳと、熱流束センサＳによる検出値に基づいて、二次電池１０の発熱量を算出し、充放電電流と、端子間電圧と、発熱量とに基づいて、二次電池１０の開放端電圧を算出し、開放端電圧に基づいて、二次電池１０の充電率を推定する充電率推定部３８と、を備える。【選択図】 図４