The Furukawa Electric Co., Ltd.

Furukawa Automotive Systems Inc.

Fujitsu Corporation

Koichi Yokoyama

Noriyasu Iwane

Naoya Takashima

Etsuzo Sato

Taiji Mitsuyama

Tamas Mihalffy

Antal Kovats

Lorand Romvari

Shinichi Nomoto

Kenji Toyama

[Object] To detect states of a plurality of secondary batteries whose kinds are different with high accuracy. [Organization] A measurement unit (voltage sensor, current sensor) measuring a current value of a current flowing at a secondary batteryand a voltage value of a voltage generated at the secondary battery by the current in a predetermined frequency; an optimization unit (CPU) optimizing element constants of an equivalent circuit model of the secondary battery based on the measured voltage value and the current value; an identification unit (CPU) identifying a kind of the secondary battery with reference to the optimized element constants of the equivalent circuit model; a storage unit (ROM) storing detection formulas which detect the state of the secondary battery by each kind of the secondary battery; an acquisition unit (CPU) acquiring the detection formula corresponding to the identified kind from the storage unit; and a detection unit (CPU) detecting the state of the secondary battery by applying the element constants to the acquired detection formula, are included.

Secondary battery state detecting device and secondary battery state detecting method

To provide a secondary battery state detecting device that decreases the deterioration in capacity of the secondary battery and is low in arithmetic cost. A secondary battery state detecting device that detects a state of a secondary battery includes discharge means (discharge circuit ()) for subjecting the secondary battery () to a pulse discharge, acquiring means (controller ()) for controlling the discharge means to subject the secondary battery to at least one pulse discharge, and acquiring a time variation of a voltage value at that time, calculating means (controller ()) for calculating a parameter of a predetermined function having time as a variable by fitting the variation of the voltage value acquired by the acquiring means using the predetermined function, and detecting means (controller ()) for detecting the state of the secondary battery on the basis of the parameter of the predetermined function calculated by the calculating means.

[Object] To accurately detect states of a variety of types of secondary batteries even in a low-current range. [Solution] A secondary battery state detecting device includes: a current detecting unit (a current sensor ()) that detects a value of a current flowing in a secondary battery (); a calculating unit (an equivalent circuit component calculation module ()) that calculates an equivalent circuit component that constitutes an equivalent circuit of the secondary battery; an estimating unit (a voltage drop value calculation module ()) that estimates a value of a voltage drop caused by a value of a dark current on the basis of the value of the dark current and the equivalent circuit component, the value of the dark current corresponding to a value of a current detected by the current detecting unit and the dark current flowing in the secondary battery after the vehicle has stopped, and the equivalent circuit component corresponding to the equivalent circuit component calculated by the calculating unit and having an element value varying nonlinearly in accordance with the value of the dark current; and a state detecting unit (an open circuit voltage calculation module ()) that detects a state of the secondary battery on the basis of the value of the voltage drop estimated by the estimating unit.

Secondary battery state detection device and secondary battery state detection method

Provided are a secondary battery degradation determination method and a secondary battery degradation determination device which can detect degradation of a secondary battery in advance even before an engine starts. When it is determined in Step Sthat a vehicle is in a stop state, a stable-state open-circuit voltage OCV is measured in Step Sand internal resistance R1 is calculated in Steps Sand S. On the other hand, when it is determined in Step Sthat a starteris operated, a maximum discharge current value Inew is measured in Step Sand a maximum discharge current value Is is updated in Steps Sand S. In Step S, a minimum voltage Vs is calculated. In Step S, the stable-state open-circuit voltage OCV and the minimum voltage Vs are compared with predetermined threshold values to perform the degradation determination of a secondary battery

Secondary battery degradation determination method and secondary battery degradation determination device

A state detecting method and device of a secondary battery correct impact resulting from state quantities caused by variation and calculate a state of charge with high accuracy. The state detecting method includes a first step of acquiring a detected voltage value and a detected current value, a second step of acquiring state quantities caused by variation such as a detected temperature value, a third step of determining if the detected voltage value is the voltage threshold value or greater, a fourth step of determining if the detected current value is the current threshold value or less, a fifth step of determining if a duration time of the current threshold value or less has elapsed a determination time, a sixth step of setting a state of charge in a reference state as the state of charge, and a seventh step of correcting the state of charge in the reference state.

State detecting method and state detecting device of secondary battery

A secondary battery state detecting apparatus for detecting a state of a secondary battery installed in a vehicle is provided, which includes a current detecting unit that detects an electric current flowing to the secondary battery, a voltage detecting unit that detects a voltage of the secondary battery, and a determining unit that determines, in a case where an external device is directly connected to terminals of the secondary battery and the secondary battery is charged or discharged without passing through the current detecting unit, whether or not an irregular charging-discharging has occurred, in accordance with a change in a current value and a voltage value detected by the current detecting unit and the voltage detecting unit.

Secondary battery state detecting apparatus and secondary battery state detecting method

A wiring board according to the present invention includes a mounting region in which memories having different storage capacities can be mounted. The mounting region has: first wires for, when a first memory is mounted, making it possible to access all the addresses of the first memory; and second wires for, when a second memory having a storage capacity different from that of the first memory, making it possible to access to all the addresses of the second memory. For this reason, before an electronic device on which the wiring board is mounted is shipped, a memory mounted in the mounting region can be selected depending on the demand of a user.

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Tokyo, Japan

Koichi Yokoyama