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AssigneesHitachi, Ltd., Hitachi Vehicle Energy, Ltd.
InventorsAkihiko Kudo, Mutsumi Kikuchi, Gosuke Shibahara, Akihiko Emori, Yasuo Uemura, Tatsumi Yamauchi, Kenji Kubo, Masahito Sonehara, Masahiko Amano, Yoshinori Aoshima
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A battery monitoring system, comprises a battery state detection circuit that detects battery states of a plurality of battery cells that are connected in series, based on respective cell voltages of the plurality of battery cells, and a control circuit that monitors state of a battery cell, based on each cell voltage of the plurality of battery cells. The control circuit inputs pseudo voltage information to the battery state detection circuit, and thereby diagnoses whether or not the battery state detection circuit is operating normally.
A battery monitoring system, comprising:
A diagnosis method for a battery monitoring system that comprises an excessive charge detection circuit that detects excessive charge of a battery cell by comparing each cell voltage of a plurality of battery cells that are connected in series with an excessive charge threshold value, and outputs detection information, wherein a voltage that corresponds to excessive charge is inputted to the excessive charge detection circuit instead of the measured cell voltage, and whether or not the excessive charge detection circuit is operating normally is diagnosed based on presence or absence of an output of the detection information.
A diagnosis method for a battery monitoring system that selects one of a plurality of voltages inputted from a plurality of battery cells that are connected in series with a selection circuit, measures this selected voltage with a voltage measurement circuit, and monitors state of the battery cell based on the measured voltage, wherein a plurality of mutually different voltages are generated, a mutually different voltage is selected by the selection circuit instead of a voltage of the battery cell, and state of selection of the selection circuit is diagnosed based on voltage values measured by the voltage measurement circuit.
Dependencies are inferred from the claim text.