Kabushiki Kaisha Toyota Jidoshokki

Junichi Hatano

Kenji Nishigaki

Ryusuke Hase

Takahiro Tsuzuku

Shinji Hirose

Toshio Otagiri

Hiroto Sato

Shinichi Aizawa

Mamoru Kuraishi

Yusuke Tsutsui

Satoshi Yamamoto

Hiroyuki Nomura

Yuki Muramatsu

Hiroko Adaniya

Tomoyuki Ito

Kazuhiro Niimura

A power storage apparatus including a battery and a control circuit that controls the charging or discharging of the battery, wherein during a polarization elimination time period extending from the charging/discharging end time of the battery to a polarization-eliminated time at which polarization of the battery can be judged to have been eliminated, the control circuit obtains, as an amount of change, the difference between a voltage measured at a first time set according to the temperature of the battery and a voltage measured at a second time following the first time and set according to the temperature of the battery, and sums the product of the amount of change and an estimation coefficient and the voltage measured at the first or second time so as to estimate an open-circuit voltage of the battery to be provided after elimination of the polarization of the battery.

Power storage apparatus

Provided is a power storage apparatus including a battery and a control circuit that controls charging and discharging of the battery, wherein during a polarization elimination time period, the control circuit obtains, as an amount of change, a difference between a first voltage of the battery measured at a first time and a second voltage of the battery measured at a second time following the first time, multiplies the amount of change by an estimation coefficient that depends on the first voltage, the second voltage, a temperature of the battery, a temperature of a space around the battery, or a degree of deterioration of the battery, and sums the value obtained so as to estimate an open-circuit voltage to be provided after elimination of the polarization of the battery.

Power storage apparatus for estimating an open-circuit voltage

A power storage apparatus including a battery and a control circuit controlling charging/discharging of the battery, wherein the control circuit determines, when a predetermined time period that has elapsed after the charging/discharging of the battery was ended is shorter than a polarization elimination time period extending from a time at which the charging/discharging of the battery was ended to a time at which polarization of the battery was judged to have been eliminated, an estimated open-circuit voltage for the battery after the elimination of the polarization of the battery; determines the difference between a first estimated charge state and a charge state determined by a time at which the estimated open-circuit voltage was estimated; and determines a second estimated charge state by summing the state of charge determined by the time at which the estimated open-circuit voltage was estimated and the product of the difference and the reflection coefficient.

Power storage apparatus and controlling method for the same

When it has been determined according to a voltage detected by a voltage detecting unitthat a voltage detection linebetween a focused-on batteryand the voltage detecting unithas been broken, operations of each of switchesare controlled to separate a battery modulethat includes the voltage detection linefrom a power supply apparatus. When it has been determined according to the voltage detected by the voltage detecting unitthat the focused-on batteryhas been overcharged or overdischarged, power input to, or output from, every battery moduleis limited.

Power supply apparatus, protection apparatus, and protection method

A management system and a management method of a battery and a battery charger, and a battery charger are provided that can obtain information on the state of a battery and information on the usage state of a battery charger even during charging so as to monitor/control the battery and the battery charger even during the charging.

Management system and management method of battery and battery charger, and battery charger

An abnormality diagnostic for a MOSFET switch element in a rechargeable battery pack for determining a short circuit abnormality (fusion) in a MOSFET switch element that causes a charge current to flow in. An on/off controller turns off a MOSFET causing a charge current to flow into a battery module, a start-of-charge instruction unit transmits to a charger an instruction signal to start a charging operation, and a short circuit abnormality diagnostic unit determines, based on a current sensor output, whether current is flowing through the MOSFET due to the charging operation to diagnose a short circuit abnormality in the MOSFET. After diagnosis of the MOSFET, a diagnosis of a short circuit abnormality in a MOSFET that causes a discharge current to flow out of the battery module is performed, and then a diagnosis of a short circuit abnormality in a charge relay is performed.

Growing community of inventors

Kariya, Japan

Junichi Hatano