Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Vehicle Energy, Ltd.

Hitachi Astemo Ltd.

Renesas Technology Corp.

Hitachi Construction Machinery Co., Ltd.

Mutsumi Kikuchi

Akihiko Kudo

Akihiko Emori

Tatsumi Yamauchi

Kenji Kubo

Tomonori Kanai

Hikaru Miura

Akihiro Machida

Gosuke Shibahara

Akihiko Kanouda

Fumio Murabayashi

Takashi Sase

Yasuaki Norimatsu

Akihiko Kudoh

Atsuo Watanabe

Youhei Kawahara

Yoshinori Aoshima

Hidemitsu Naya

Masatsugu Amishiro

Yasuo Uemura

Kei Sakabe

Kenji Tabuchi

Kenichiro Tsuru

Masaki Nagaoka

Shigeo Moriyama

Kotaro Shimamura

Masahiko Amano

Masahito Sonehara

Rikio Tomiyoshi

Takashi Hotta

Masahiko Saito

Takahide Terada

Yoshitaka Takahashi

Hiroshi Iwasawa

Mitsuo Noda

Hideaki Koyama

Eisaku Fujita

Akira Ishii

Junichi Kimura

Takeshi Inoue

Noboru Akiyama

Seiji Ishida

Keiichiro Ohkawa

Mutsumi Suzuki

Koji Tateno

Hiroyuki Shoji

Takanori Yamazoe

Makoto Suzuki

Satoru Shigeta

Ken Takeuchi

Masahiro Ueda

Itaru Naya

Manabu Murakawa

Kazuaki Adachi

Akihiro Emori

In a case where a load current flows in an energized state where a power supply is connected to a load, it is assumed that a measured voltage fluctuates due to a voltage drop caused by contact resistance of a relay contact, and thus the relay state cannot be accurately diagnosed. A relay control device that controls a relay connected between a secondary battery and a load device calculates, in a failure diagnosis during energization with the relay being closed, a contact resistance value of the relay based on a voltage applied to the relay and a current flowing through the secondary battery, and determines a first threshold set as a variable value in accordance with a temperature change amount of the relay and compares the calculated contact resistance value with the first threshold to diagnose a failure of the relay.

Relay control device and method of controlling relay control device

A battery management unit capable of more reliably turning off a high-voltage relay. A battery management unitincludes a high-voltage relayserving as a switch unit that turns on/off electrical connection between a high-voltage battery, which is a secondary battery, and an external device, and a power source ICserving as a disconnection control unit having a first disconnection processing function of turning off the high-voltage relayat the time of abnormality of the battery management unitand a second disconnection processing function of detecting an abnormality of the first disconnection processing function and turning off the high-voltage relay

Battery management unit

A relay () connects and disconnects an electrical circuit to which an inverter () and an electricity storage device () are connected. A BCU () controls the electricity storage device (). An HC () controls an electric motor (), the inverter () and the BCU (). The HC () and the BCU () respectively have FET switches () for controlling supply and stop of the excitation current in the relay (). When the electricity storage device () is determined to be in an abnormal state, the BCU () transmits an abnormal signal to the HC (), and when a predetermined time has elapsed, turns off (opens) the first FET switch () of the BCU (). The HC () executes stop processing based upon the abnormal signal received from the BCU () and then turns off (opens) the second FET switch () of the HC ().

Electricity storage device controller, electric system and construction machine

Disconnection of a circulation path through which a circulation current flows is detected while suppressing an increase in circuit scale. A battery monitoring device includes switching circuits that control currents flowing through coils of main contactors by being controlled to be turned on and off, freewheeling diodes that are connected to the coils of the main contactors to form circulation paths for circulating the currents, and a control unit. The control unit measures output voltages of the freewheeling diodes at an input terminal, and detects the disconnection of the circulation paths based on the output voltages of the freewheeling diodes.

Load control device having multiple terminals and a clamp circuit connected therebetween

Provided are a battery monitoring device capable of suppressing a current flowing to individual battery cells and enhancing the safety thereof, even when there is a short circuit, for example, in a connection line connecting substrates having integrated circuits mounted thereon and a substrate having a microcomputer mounted thereon or a connection line connecting the substrates having the integrated circuits mounted thereon, and a battery system using the same. Resistors are provided in a positive electrode input lineconnecting a positive electrode side of a battery pack groupand a total voltage detecting unitand/or a negative electrode input lineconnecting a negative electrode side of the battery pack groupand the total voltage detecting unitand the resistors of the positive electrode input lineand/or negative electrode input lineare arranged on individual cell monitoring circuit boardsand

Battery monitoring device and battery system using same

A battery system includes a battery module that is constituted with a plurality of serially connected battery cells, a plurality of integrated circuits that group the battery cells so as to perform processing on battery cells in each group, a first transmission path through which a command signal is transmitted via a first insulating circuit from a higher-order control circuit that controls the integrated circuits to a highest-order integrated circuit of the integrated circuit, a second transmission path through which a data signal collected by the integrated circuits is transmitted from the highest-order integrated circuit to a lowest-order integrated circuit, and a third transmission path through which the data signal is transmitted from the lowest-order integrated circuit to the higher-order control circuit via a second insulating circuit.

Battery system in which information transmission occurs via insulating circuits

The present invention enables correct detection of the state of a relay provided on each of the positive and negative terminal sides of a secondary battery. A positive-side main relay makes or breaks continuity between first and second positive contact points, and a negative-side main relay makes or breaks continuity between first and second negative contact points. A microcomputer can measure a first voltage between the first positive and first negative contact points, a second voltage between the second positive and first negative contact points, and a third voltage between the first positive and second negative contact points. The microcomputer detects the state of the positive-side main relay based on a voltage measurement result obtained when the first and second voltages are measured synchronously, and detects the state of the negative-side main relay based on a voltage measurement result obtained when the first and third voltages are measured synchronously.

Battery monitor

A battery system includes a battery module having a plurality of assembled batteries. Battery monitoring circuits are provided to correspond to each of the assembled batteries of the battery module. A control circuit controls operation of the battery monitoring circuits. A first signal transmission path transmits signals that are input and output between the battery monitoring circuits and the control circuit. A first isolation element is connected to the control circuit, and a second isolation element is connected to the battery monitoring circuit. The first signal transmission path is isolated from the control circuit by the second isolation element. The electrical potential of the first signal transmission path is a floating potential in relation to the electrical potentials of the control circuit and battery monitoring circuits.

Battery system

A battery system monitoring apparatus for monitoring a cell group having a plurality of battery cells, and includes a cell controller IC which monitors and controls the states of the plurality of battery cells. A battery controller controls the cell controller IC and a plurality of voltage detection lines measure the voltage across the terminals of the battery cell. The voltage detection lines connect positive and negative electrodes of the battery cell, respectively, to a plurality of voltage input terminals of the cell controller IC. A power line connects the positive electrode of the battery cell having the highest potential among the plurality of battery cells to a power supply terminal of the cell controller IC and a ground line which connects the negative electrode of the battery cell having the lowest potential among the plurality of battery cells to a ground terminal of the cell controller IC.

Battery system monitoring apparatus and electric storage device including the same

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 secondary battery system capable of acquiring an SOC of a battery with a simple computation without acquiring battery characteristics is to be provided. The secondary battery system according to the present invention is adapted to acquire a momentary SOC (charging SOC) by obtaining an initial value of an SOC from a CCV acquired during a charging period and adding an integrated value of a charge or discharge current to the initial value of the SOC, acquire a momentary SOC (discharging SOC) by obtaining an initial value of an SOC from a CCV acquired during a discharging period and adding an integrated value of a charge or discharge current to the initial value of the SOC, and acquire an SOC close to a true value by averaging the charging SOC and the discharging SOC.

Secondary battery system

A battery monitoring device includes a first voltage measurement unit, a second voltage measurement unit, a current measurement unit, a cell voltage ratio calculation unit, a cell voltage calculation unit, and a trigger signal generation unit. The cell voltage ratio is a ratio of an individual cell voltage measurement value to a total sum of all cell voltage measurement values. The cell voltage measurement value is equal to the cell voltage ratio multiplied by the total voltage of all of the battery cells constituting the battery pack.

Battery monitoring device that monitors a plurality of battery cells connected in series

To provide a system for controlling power supplies in a device including batteries, andby wireless signals with high reliability. The system includes the batteries, a power supply control devicesupplied with power from the batteries, and, and a controllerfor making wireless communication with the power supply control device. The power supply control deviceincludes a startup unitfor receiving a wireless startup signal transmitted from the controllerand controlling power supplying from the batteries to the power supply control device, and a communication unitfor making wireless communication with the controller. While the startup unitis receiving the wireless startup signal, wireless communication is made by the communication unit

Power supply control system, power supply control device and method

Even with a large ripple voltage superposed on a voltage of a battery cell, the voltage of the battery cell can be measured accurately. In a battery monitoring device, a supply circuit, based on a reference voltage inputted from an assembled battery, generates a driving voltage for driving each of switching elements, of a selection circuit and supplies the driving voltage to the selection circuit. The reference voltage is inputted from the assembled battery to the supply circuit via a detecting filter circuit. As a result, a time constant of a route through which the reference voltage is inputted from the assembled battery to the supply circuit is approximately equal to time constants of detecting filter circuits.

Battery monitoring device

Growing community of inventors

Hitachinaka, Japan

Mutsumi Kikuchi