Kabushiki Kaisha Toyota Jidoshokki

Ryusuke Hase

Takahiro Tsuzuku

Satoshi Yamamoto

Hiroaki Kato

Junichi Hatano

Kenji Nishigaki

Toshio Otagiri

Hiroto Sato

Shinichi Aizawa

Kimihiro Sato

Takuya Yamamoto

Hiroyuki Nomura

Hiroko Adaniya

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

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 battery monitoring device is configured to include a monitoring unit that monitors a state of a battery, an interrupter that interrupts a power supply to a load, and another interrupter that interrupts a power supply to the interrupter, wherein the monitoring unit controls an operation of the interrupter such that a power supply to the load is interrupted, and controls an operation of the other interrupter such that a power supply to the interrupter is interrupted.

Battery monitoring device

Each of a plurality of monitoring units () that monitor the states of batteries allocates, as identifying information for itself, identifying information corresponding to an input signal inputted from a preceding control unit () or monitoring unit (); outputs, to a subsequent monitoring unit (), a signal that differs from the input signal corresponding to the identifying information the monitoring unit () in question has allocated to itself; and, if and when identifying information corresponding to an input signal differs from the identifying information the monitoring unit () in question had allocated to itself, reallocates identifying information corresponding to said input signal as identifying information for itself.

Battery-monitoring system and identifying-information setting method

A battery monitoring device is configured to include a monitoring unit that transmits state information that indicates a state of a battery and that interrupts, using an interrupter, a power supply from a battery to a load upon receiving a power-interruption request or when a power supply to the monitoring unit is interrupted, and a controller that transmits a power-interruption request to the monitoring unit upon determining, on the basis of the state information transmitted from the monitoring unit, that an anomaly has occurred in the battery, wherein the controller interrupts, using an interrupter, a power supply to the monitoring unit upon determining that a communication anomaly has occurred between the monitoring unit and the controller, or that an anomaly has occurred in the monitoring unit.

A battery control unit system is provided that detects a state of a battery used for driving a vehicle and monitors the state of the battery on the basis of detected information so as to control a circuit device surrounding the battery according to a result of the monitoring. The battery control unit system may include an internal power source that is connected directly in parallel with the battery and that supplies power to the battery control unit system, and a microcontroller that operates using the internal power source and detects, by a software process, an on/off-state of a battery pack switch that is provided in a battery pack including the battery and the battery control unit system.

Battery control unit system

Upon receiving a setting signal S, each of a plurality of monitoring units transmits the first setting signal to the subsequent monitoring unit or a control unit, and in a case when it is not possible to receive the first setting signal, the monitoring unit transmits a second setting signal, which indicates an occurrence of a communication abnormality, to the subsequent monitoring unit or the control unit, and when receiving the second setting signal, it changes the received second setting signal so as to transmit the changed second setting signal to the subsequent monitoring unit or the control unit, while the control unit identifies the occurrence location of a communication abnormality in accordance with second setting signal transmitted from the last monitoring unit.

Each of a plurality of monitoring units, when identification information is not set for it, transmits, to a subsequent monitoring unit or a control unit, a fixed unset signal that indicates that identification information has not been set for it, regardless of signal transmitted from the previous monitoring unit or the control unit, and the control unit, upon receiving the unset signal transmitted from a last monitoring unit, shifts to an identification information setting process.

Growing community of inventors

Kariya, Japan

Ryusuke Hase