Gs Yuasa International Ltd.

Yazaki Corporation

Tomoshige Inoue

Takeyuki Shiraishi

Daisuke Konishi

Takeshi Itagaki

Tomohiro Kawauchi

Masashi Sekizaki

Michito Enomoto

Kenichi Sejima

Katsuhisa Michinaga

Takashi Ikeda

Takatomo Yoshioka

Kota Seto

A management devicecomprising a main control partthat, during charging of a plurality of power storage elementsconnected in series, outputs a first pull-down signal to a converterso as to lower a charging voltage when the cell voltage of any of the power storage elementsis equal to or greater than a first threshold value.

Management apparatus, energy storage apparatus, and energy storage system

Provided is an estimation device for estimating an actual capacity of an energy storage device or a total reduction amount of the actual capacity. The estimation device includes a processor which is configured to calculate the actual capacity of the energy storage device or the total reduction amount of the actual capacity based on approximation data where a capacity change curve indicative of a transition of the actual capacity or a transition of the total reduction amount of the actual capacity with respect to an elapsed time is approximated by a plurality of straight lines.

Estimation device and estimation method

A battery monitoring unit includes a control IC, a CPU, and a load circuit. In the inside of the battery monitoring unit, the control IC and the CPU each of which is a control circuit are connected to a unit internal ground that is common thereto. The load circuit is connected to a power ground different from the unit internal ground. In the inside of the battery monitoring unit, the power ground and the unit internal ground are connected with each other via a diode. The unit internal ground and the power ground are connected to an external ground that is common thereto via an electric wire extending from a first ground terminal and an electric wire extending from a second ground terminal, respectively.

Drawback resistant battery monitoring unit

A switch failure diagnosis device for using in a current path between an electric device and an electric storage device includes plural switches, a switch terminal voltage detector, and a controller. The switches are connected parallel to each other in the current path. The switch terminal voltage detector outputs a switch terminal voltage detection signal. The controller is configured to select the switches at different time in sequence and input an open instruction signal to each switch at the time when the switch is selected, and to determine, based on the switch terminal voltage detection signal output while the open instruction signal is given, that at least one of the switches has a failure if the detected voltage is in a failure determination range.

Switch failure diagnosis device and electric storage apparatus

A switch failure diagnosis device for using in a current path between an electric device and an electric storage device includes plural switches, a switch terminal voltage detector, and a controller. The switches are connected parallel to each other in the current path. The switch terminal voltage detector outputs a switch terminal voltage detection signal. The controller is configured to: select the switches at different time in sequence and input an open instruction signal to each switch at the time when the switch is selected; and determine, based on the switch terminal voltage detection signal output while the open instruction signal is given, that at least one of the switches has a failure if the detected voltage is in a failure determination range.

Growing community of inventors

Kyoto, Japan

Tomoshige Inoue