Hitachi, Ltd.

Shin-Kobe Electric Machinery Co., Ltd.

Hitachi Vehicle Energy, Ltd.

Hitachi Automotive Systems, Ltd.

Akihiko Emori

Akihiko Kudou

Hideki Miyazaki

Toshisada Mitsui

Kazuyoshi Sasazawa

Shigeyuki Yoshihara

Mitsuyuki Hombu

Youhei Kawahara

Kei Sakabe

Hikaru Miura

Ryouhei Nakao

Naoyuki Igarashi

Yohei Kawahara

Ryohei Nakao

Keiichiro Ookawa

Provided is a battery control device which can verify a probability of a state of charge or a state of health of a battery. A battery controller according to the invention calculates a measurement parameter of the battery using the state of charge or the state of health of the battery, and the probability of the state of charge or the state of health is diagnosed by comparing the measurement results (see FIGS.() and()).

Battery controller

In a battery device including a battery pack in which a plurality of cells are connected in series, there are provided a battery control circuit or a battery device capable of eliminating a fluctuation in the voltage or charged state which can occur between the cells, or preventing the cells from being maintained in an over-charged state for a long period. A plurality of cell groups each including a plurality of cells are connected in series to form a battery pack. Cell controller is provided to the respective cell groups operate with electricity supplied from the cell groups allocated thereto so as to monitor and control the state of the cells of the cell group. Battery pack controller controls the cell controller based on information from the plurality of cell controller.

Battery control circuit and battery device

A ground fault detection circuit according to the present invention is a ground fault detection circuit that detects the occurrence of a ground fault of a battery that is insulated, and that includes: an AC signal generation section that generates an AC signal; a first capacitive element that couples the AC signal generated by the AC signal generation section to the battery; a voltage division section that voltage divides the AC signal that is coupled to the battery by the first capacitive element; a ground fault detection unit that detects a ground fault of the battery based on an AC component of an input signal; and a second capacitive element that couples the AC signal that has been voltage divided by the voltage division section to the ground fault detection unit as the input signal.

Ground fault detection circuit, and power supply device

A state detecting system which can detect state of power storage at high precision even with lesser characteristic data to be used for calculation, and a device employing the same. The state detecting system has a memory for storing a characteristic data, calculation information, and set information, an arithmetic unit for calculating state information indicative of state of said power storage and calculating correction information for performing correction, a first correcting unit for correcting input of said arithmetic means, and a second correcting unit for correcting information stored or set in the storage.

State detecting system and device employing the same

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Hitachinaka, Japan

Akihiko Kudou