The Furukawa Electric Co., Ltd.

Furukawa Automotive Systems Inc.

Honda Motor Co., Ltd.

Hideaki Ishihara

Etsuzo Sato

Naoki Ishiyone

Fukuda Kazumi

[Summary] [Object] To accurately detect a state of a secondary battery when the secondary battery is mounted on a vehicle. [Organization] In a secondary battery state detecting devicedetecting a state of a secondary batterywhich is mounted on a vehicle, a first operation mode being an initial operation mode in a case newly connected to the secondary battery and a second operation mode being a normal operation mode after the first operation mode are included, and an initial state detecting unit (control part) which makes the operation mode transit to the first operation mode, and detects an initial state of the secondary battery with reference to a terminal voltage of the secondary battery in a case connected to the secondary battery; and a normal state detecting unit (control part) which makes the operation mode transit to the second operation mode, and detects the state of the secondary battery at a normal time based on the terminal voltage and a charge/discharge current of the secondary battery at a predetermined timing after the state of the secondary battery is detected by the initial state detecting unit are included.

Secondary battery status detection device and secondary battery status detection method

A current detecting unit (current sensor) detecting a current value of a current flowing in a secondary battery; an extreme value detecting unit (CPU) detecting a first extreme value of a current after an inrush current flows from the secondary battery to a starter motor after electricity to the starter motor is turned on based on the current value; an inflection point detecting unit (CPU) detecting a first inflection point of the current after the inrush current flows based on a variation of the current value per a predetermined time; and a calculation unit (CPU) selecting the inflection point when timings when the extreme value and the inflection point are detected are separated for a predetermined time or more, and selecting either one of the extreme value or the inflection point in the other cases to set as a starting current, and calculating a starting voltage from the starting current, an internal resistance of the secondary battery, and a voltage before starting being a voltage of the secondary battery before the electricity to the starter motor is turned on, are included.

Secondary battery state detecting device and secondary battery state detecting method

A battery condition detection sensor () for measuring characteristics of a battery () includes an electrically conductive battery post terminal () and a shunt resistor (). The battery post terminal () is mounted to a battery post () provided in the battery (). The shunt resistor () is electrically connected to the battery post terminal (). The shunt resistor () is configured such that a connection terminal () of a wire harness () can be fixed thereto. The shunt resistor () has a rotation-blocking portion (inner walls of the insertion holes ()) for blocking rotation of the connection terminal ().

Growing community of inventors

Shiga, Japan

Hideaki Ishihara