Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Vehicle Energy, Ltd.

Yasuo Uemura

Akihiko Kudo

Mutsumi Kikuchi

Kenji Kubo

Yoshinori Aoshima

Gosuke Shibahara

Akihiko Emori

Tatsumi Yamauchi

Masahiko Amano

Masahito Sonehara

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.

Battery monitoring system

A battery system for a vehicle is provided with discharge circuits (RA throughD,A throughD) that discharge battery cells (BCthrough BC) via measurement lines of those battery cells (BCthrough BC). A control circuit transmits to an integrated circuit (A) a first discharge command that causes discharge of the odd numbered battery cells (BCand BC) of a cell group (GB), a first transmission command that causes transmission to the control circuit of the terminal voltages of only the odd numbered battery cells (BCand BC) measured during execution of the first discharge command, a second discharge command that causes discharge of the even numbered battery cells (BCand BC) of the cell group (GB), and a second transmission command that causes transmission to the control circuit of the terminal voltages of only the even numbered battery cells (BCand BC) measured during execution of the second discharge command; and, based on the these various terminal voltages transmitted from the integrated circuit (A), the control circuit diagnoses abnormalities in the system that includes the battery cells, the measurement lines, and the discharge circuits.

Battery system for vehicle

A battery control device for a battery module includes a plurality of integrated circuits. Each integrated circuit includes: a constant voltage circuit that lowers a total voltage of a battery cell group corresponding to the integrated circuit to an integrated circuit internal voltage; a signal generation circuit that generates, based upon a first signal provided by a higher-order control circuit, a second signal assuming a wave height value different from a wave height value of the first signal and outputs the second signal; and a startup circuit that includes a first comparator assuming a first decision-making threshold value corresponding to the first signal and a second comparator assuming a second decision-making threshold value corresponding to the second signal, and starts up the constant voltage circuit in response to a change in an output from at least either the first comparator or the second comparator.

Battery control device and battery system

Growing community of inventors

Naka, Japan

Yasuo Uemura