STORAGE BATTERY STATE ESTIMATION DEVICE

• Main Authors: WADA Toshihiro, KADOTA Seigo, TAKEGAMI Tomoki
• Format: Patent
• Language: English; French; German
• Published: 05.02.2020
• 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

In response to demands for stably and precisely estimating states, like a residual quantity and a capacity of a rechargeable battery, a rechargeable battery state estimation device (100) includes a current detecting unit ( 102) which detects a charge-discharge current of the rechargeable battery ( 101) as a detected current; a voltage detecting unit (103) which detects a voltage between terminals of the rechargeable battery (101) as a detected voltage; an OCV estimation method SOC estimation unit (104) which calculates an OCV estimation method state of charge, based on the detected current and the detected voltage; a current integration method parameter estimation unit (105) which estimates a current integration method parameter including a capacity retention rate, based on the detected current and the OCV estimation method state of charge; and a corrected SOC estimation unit (106) which calculates an estimated state of charge, based on the detected current, the OCV estimation method state of charge, and the current integration method parameter, where a state of charge of the rechargeable battery is estimated as an estimated state of charge.