The Furukawa Electric Co., Ltd.

Furukawa Automotive Systems Inc.

Honda Motor Co., Ltd.

Nippon Telegraph and Telephone Corporation

Etsuzo Sato

Noriyasu Iwane

Taiji Mitsuyama

Takezo Sugimura

Naotaka Uchino

Yuichi Watanabe

Koichi Yokoyama

Antal Kovats

Hideaki Ishihara

Tomohiro Watanabe

Tsunetoshi Saito

Shinichi Nomoto

Nobuo Tomita

Toshihiko Ota

Takayuki Morikawa

Kazunori Watanabe

Akira Oono

Tamas Mihalffy

Naoki Ishiyone

Kazuyoshi Sato

Hirokazu Narui

Mamichi Tsuyuki

Fukuda Kazumi

A chargeable battery state detection apparatus configured to detect a state of a chargeable battery is provided, comprising processor(s) and memorie(s) communicatively connected to the processor(s), wherein the processor(s) read out a group of instructions stored in the memorie(s), and execute a detection process for detecting a voltage and a current of the chargeable battery; a storage process for storing voltage values detected at different times by the detection process after charge and discharge is stopped; a fitting process for fitting, with respect to the voltage values, by adjusting coefficients of a predetermined function; a calculation process for calculating an open circuit voltage based on the function; and a discard process for discarding at least a part of the voltage values stored by the storage process when a current value or a voltage value detected by the detection process fluctuates by a predetermined threshold value or greater.

Chargeable battery state detection apparatus and chargeable battery state detection method

A rechargeable battery short-circuit early detection device that detects a short-circuit in a rechargeable battery includes one or more processors connected to a current sensor that detects a charging current of the rechargeable battery, wherein the one or more processors are programmed to: if a detected temporal slope of the charging current exceeds a first threshold, determine that there is a possibility that a short circuit has occurred in at least one of the cells; detect anew a temporal slope of the charging current after a prescribed period of time has elapsed since the determination of said possibility; and thereafter, if the anew detected temporal slope of the charging current exceeds a second threshold that is greater than the first threshold, determine that there is a possibility that the short-circuit is progressing, and output a signal indicating said possibility.

Rechargeable battery short circuit early detection device and rechargeable battery short circuit early detection method

A rechargeable battery short-circuit early detection device that detects a short-circuit in a rechargeable battery includes one or more processors connected to a current sensor that detects a charging current of the rechargeable battery, wherein the one or more processors are programmed to: while the rechargeable battery is being charged, receive a current signal indicating the charging current from the current sensor; detect a temporal change in the charging current indicated by the current signal; determine, when the charging current increases over time, that there is a possibility that the rechargeable battery has short-circuited; and output data indicating a determined result.

A secondary battery deterioration estimation device includes receiving a first signal representing a discharging voltage; receiving a second signal representing a discharging current from a current sensor; calculating values of elements forming an equivalent circuit of the secondary battery based on the first and second signals; calculating a state of health (SOH) of the secondary battery based on the values of the elements forming the equivalent circuit; generating history information showing history of a use state of the secondary battery; calculating the SOH of the secondary battery based on the history information; determining a deterioration state of the secondary battery with reference to at least one of the SOH calculated by the values of the elements or the SOH calculated by the history information by the processor in accordance with a state of the secondary battery; and outputting data representing the deterioration state of the secondary battery.

Device for estimating degradation of secondary cell, and method for estimating degradation of secondary cell

To accurately determine whether an engine can be started while accurately detecting a degree of deterioration of a secondary battery, in a secondary battery state detecting device detecting a state of a secondary battery mounted on a vehicle, a measurement unit measures a value of an internal resistance of the secondary battery at an engine stop time. An estimation unit estimates a value of a diffusion resistance resulting from diffusion of an ion generated at an electrolytic solution of the secondary battery by supplying electric power to a starter motor at a starting time of the engine. A calculation unit calculates a starting voltage being a voltage for the starting of the engine from a resistance value obtained by adding the value of the diffusion resistance estimated by the estimation unit to the value of the internal resistance measured by the measurement 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

[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

To learn a parameter of a simulation model of a battery efficiently. A battery internal state estimating apparatus, estimating an internal state of a battery based on a simulation model of the battery, includes a storing section (RAM) that stores a plurality of parameters of the simulation model, a detecting section (I/F) that detects a discharge current flowing from the battery to a load, a selecting section (CPU) that selects a parameter to be subjected to adaptive learning based on a value of the discharge current detected by the detecting section, and an adaptive learning section (CPU) that performs adapting learning on a parameter selected by the selecting section.

Battery internal state estimating apparatus and battery internal state estimating method

The invention provides a battery condition estimating method and a power system permitting to estimate aging level or discharge ability of a battery in high precision by reducing transient changes of response voltages caused by repetitive discharges. A recovery time after a discharge is prolonged with a number of times of discharge and a relationship between the number of times of discharge and the recovery time is approximated by using an exponential function in the battery condition estimating method of the invention. A discharge pattern as shown in FIG.is formed by using the recovery time obtained from this approximation and substantially constant response voltage is obtained by discharging the battery in accordance to this discharge pattern. Then, impedance during a metastable condition is calculated from the measured response voltage and the discharge current and the aging level or the discharge ability of the battery is determined from the impedance.

Battery condition estimating method and power system

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 full charge sensing apparatus for sensing a fully charged state of a secondary battery based on an equivalent circuit model of the secondary battery includes a measuring unit that measures a voltage and a current during charging of the secondary battery, a learning unit that performs a learning process on a plurality of parameters in the equivalent circuit model using a result of measurement of the measuring unit, and a determining unit that determines that the secondary battery is in a fully charged state in a case where, among the parameters on which the learning process has been performed by the learning unit, a parameter corresponding to a reaction resistance of the secondary battery is greater than a predetermined threshold.

Full charge sensing apparatus and full charge sensing 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 start-up possibility determining apparatus that determines an engine-start-up possibility by driving a starter motor by power accumulated in a secondary battery includes a dynamic internal resistance measuring unit that measures an internal resistance of the secondary battery while the engine is being started up by the starter motor, a static internal resistance measuring unit that measures an internal resistance of the secondary battery when the engine is stopped, and a determining unit that determines an engine start-up possibility by the secondary battery, based on a value obtained by a product of a ratio between a first static internal resistance before or after the past engine start-up and a second static internal resistance within a predetermined time since a current time point and the dynamic internal resistance measured by the dynamic internal resistance measuring unit at the time of the engine start-up in the past.

Start-up possibility determining apparatus and start-up possibility determining method

There is provided a state-of-charge estimation method, a state-of-charge estimation device, and a secondary-battery power system that may quickly and stably determine the convergence value of an adjustment parameter of a voltage characteristic formula that may approximate change over time of an open-circuit voltage of a secondary battery with high precision by appropriately setting the initial value of the adjustment parameter. At step S, a selected voltage measurement values V, VMbi ((i=1 to (n&#x2212;1)), and VMare used to calculate an initial value A(i=1 to n) of an adjustment parameter A(i=1 to n). In addition, at step S, an integer string bi (i=1 to (n&#x2212;1)) and a real number C are used to calculate an initial value B(i=1 to n) of an adjustment parameter B(i=1 to n).

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Shiga, Japan

Etsuzo Sato