Battery assembly state estimation device and battery assembly state estimation method

A state estimation device for a battery assembly including a plurality of rechargeable batteries, the state estimation device comprising:

• a battery information acquiring unit configured to acquire battery information of each of the rechargeable batteries;
• a memory configured to store a battery model of the battery assembly including the battery information of a rechargeable battery;
• and
• a battery state estimation unit configured to estimate a battery state of the battery assembly based on the battery information of each of the rechargeable batteries acquired by the battery information acquiring unit and the battery model of the battery assembly, wherein
• the battery state estimation unit receives the battery information of each of the rechargeable batteries acquired by the battery information acquiring unit,
• the battery state estimation unit estimates the battery state of the battery assembly based on the received battery information of each of the rechargeable batteries,
• the battery state estimation unit uses the estimated battery states of the battery assembly as a state variable and applies an optimum filter for performing optimization based on a distribution of a plurality of sample points to a state equation and an output equation included in the battery model to calculate a gain for correcting the state variable, and
• the battery state estimation unit successively estimates the battery state of the battery assembly using the calculated gain,
• each of the sample points is associated with one of the rechargeable batteries, and
• each of the sample points is allocated the battery state of the battery assembly estimated from the battery information of the associated rechargeable battery.