| CPC G01R 31/389 (2019.01) [G01R 31/374 (2019.01); G01R 31/382 (2019.01)] | 17 Claims |
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1. A state estimation method comprising:
receiving a measurement result from a current detection circuit, the measuring result being of a current flowing to a battery that is periodically detected and measured by the current detection circuit;
generating current time series data representing a time change of the current flowing to the battery, based on the measurement result of the current detection circuit;
generating first time series data representing a time change of a main physical quantity concerning an estimation target, based on the current time series data;
extracting, from the first time series data representing the time change of the main physical quantity concerning an estimation target, a local maximum value and a local minimum value, which are extreme values of the main physical quantity, and an inter-extreme-value time from the extreme value to the next extreme value;
calculating, based on first relationship data representing a relationship of a state change speed of the estimation target with the local maximum value and the local minimum value of the main physical quantity, and the extracted local maximum value and local minimum value of the main physical quantity, a first state change speed as the state change speed of the estimation target for each inter-extreme-value time; and
calculating, based on the extracted inter-extreme-value time and the calculated first state change speed, a state change amount of the estimation target for each inter-extreme-value time, wherein
the main physical quantity is an SOC of the battery as the estimation target, and
the state change speed of the estimation target including the first state change speed is one of a decrease speed of a capacity of the battery and a rising speed of a resistance.
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