Patent ID: 11913998
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Measurement (Instruments)
Classification: CPC B  G  H  Y | IPC B  G  H

Claim 0:
1. A management device comprising:
a voltage detector configured to detect a voltage, the voltage being each of voltages detected from a plurality of cells of a power storage module that are connected in series to each other; and
a controller configured to calculate at each of a first time and a second time, among the voltages detected from the plurality of cells, a voltage difference between (i) the voltage of one cell to be detected among the plurality of cells and (ii) a representative voltage, the representative voltage being based on the voltage of at least one cell to be compared among the plurality of cells; and when a discrepancy between a voltage difference at the first time and the voltage difference at the second time is equal to or more than a threshold, the controller is configured to determine that an abnormality has occurred in the one cell to be detected,
wherein the controller refers to a state-of-charge versus open-circuit-voltage (SOC-OCV) curve of a cell in accordance with a state-of-health (SOH) of the cell, so as to estimate an SOC as initial capacitance reference of the cell in correspondence to the voltage detected from the cell,
the controller introduces a linear function using an SOC as initial capacitance reference as an input variable, using an OCV as an output variable, and the linear function having an inclination predetermined, and applies the SOC as initial capacitance reference of the cell that the controller has estimated to the linear function, so as to derive an OCV, and
in place of the voltage detected from the cell, the controller uses the OCV that the controller has derived, so as to calculate the voltage difference at the first time and the voltage difference at the second time.