Patent ID: 11949258
Assignee: MITSUMI ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 8:
9. A control method for execution by a device that monitors potentials at one or more negative electrodes of a plurality of secondary battery cells electrically coupled in series, each secondary battery cell being protected by a secondary battery protection circuit that controls at least one switching element provided in a given power path among a plurality of power paths, each power path being electrically coupled in series with a corresponding secondary battery cell among the plurality of secondary battery cells, the secondary battery protection circuit including:
an anomaly detecting circuit configured to detect an anomaly of the secondary battery cells,
one or more monitoring terminals each provided in a path different from the power paths, each monitoring terminal being operable for monitoring a potential at a negative electrode of a given secondary battery cell among the plurality of the secondary battery cells,
one or more internal lines, each internal line being between the negative electrode of the given secondary battery cell and a given monitoring terminal, and
one or more internal switches, each internal switch being provided in a given internal line and configured to be turned on or off based on a result of anomaly detection performed by the anomaly detecting circuit, and the control method comprising:
adjusting, based on potentials monitored by the one or more monitoring terminals, a current flowing into a line path that includes a corresponding internal line among the one or more internal lines; and
controlling balance among the cell voltages for the plurality of the secondary battery cells, based on the adjusted current.