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US 12,716,952 B2Granted
Battery characteristic estimating device, battery characteristic estimating method, and storage medium
AssigneeHonda Motor Co., Ltd.
InventorsTakuma Kawahara, Tatsuki Yamaguchi, Yuki Sato
Life of this patent
Estimating the term…
Abstract
A battery characteristic estimating device including: an acquisition unit configured to acquire time series data including at least a current value and a voltage value of a battery; a data filtering unit configured to extract data in which a voltage change due to charging/discharging is small from the acquired time series data as estimation data; and an OCV curve estimating unit configured to estimate an OCV curve representing an open circuit voltage for a discharge capacity calculated on the basis of the current value of the battery on the basis of the estimation data extracted by the data filtering unit.
Claims9
A battery characteristic estimating device comprising:
- an acquisition unit configured to acquire time series data including at least a current value and a voltage value of a battery;
- a data filtering unit configured to extract data in which a voltage change due to charging/discharging is small from the acquired time series data as estimation data;
- an OCV curve estimating unit configured to estimate an OCV curve representing an open circuit voltage for a discharge capacity calculated on the basis of the current value of the battery on the basis of the estimation data extracted by the data filtering unit;
- and
- a traveling data integrating unit configured to integrate the estimation data at times of a plurality of times of traveling of a vehicle in which the battery is mounted,
- wherein the traveling data integrating unit uses an initial OCV curve or an OCV curve estimated from a data group at the time of specific traveling and a voltage value of a timing at which the voltage value can be regarded as an open circuit voltage at the times of the plurality of times of traveling to select representative points from the estimation data acquired at each of the plurality of times of traveling of the vehicle, and applies the estimation data to the initial OCV curve or the OCV curve with the representative points serving as a reference to estimate discharge capacity values of the estimation data of the plurality of times of traveling and integrate the estimation data at the times of the plurality of times of traveling, and
- wherein the OCV curve estimating unit estimates the OCV curve by performing optimization calculation such that a value of an error function calculated on the basis of the estimated OCV curve and the estimation data integrated by the traveling data integrating unit is a threshold or less.
4 more elements
A battery characteristic estimating method using a computer, the battery characteristic estimating method comprising:
- acquiring time series data including at least a current value and a voltage value of a battery;
- extracting data in which a voltage change due to charging/discharging is small from the acquired time series data as estimation data;
- estimating an OCV curve representing an open circuit voltage for a discharge capacity calculated on the basis of the current value of the battery on the basis of the estimation data;
- integrating the estimation data at times of a plurality of times of traveling of a vehicle in which the battery is mounted;
- using an initial OCV curve or an OCV curve estimated from a data group at the time of specific traveling and a voltage value of a timing at which the voltage value can be regarded as an open circuit voltage at the times of the plurality of times of traveling to select representative points from the estimation data acquired at each of the plurality of times of traveling of the vehicle, and applying the estimation data to the initial OCV curve or the OCV curve with the representative points serving as a reference to estimate discharge capacity values of the estimation data of the plurality of times of traveling and integrate the estimation data at the times of the plurality of times of traveling;
- and
- estimating the OCV curve by performing optimization calculation such that a value of an error function calculated on the basis of the estimated OCV curve and the estimation data is a threshold or less.
4 more elements
A non-transitory computer-readable storage medium having stored thereon a program causing a computer to:
- acquire time series data including at least a current value and a voltage value of a battery;
- extract data in which a voltage change due to charging/discharging is small from the acquired time series data as estimation data;
- estimate an OCV curve representing an open circuit voltage for a discharge capacity calculated on the basis of the current value of the battery on the basis of the estimation data;
- integrate the estimation data at times of a plurality of times of traveling of a vehicle in which the battery is mounted;
- use an initial OCV curve or an OCV curve estimated from a data group at the time of specific traveling and a voltage value of a timing at which the voltage value can be regarded as an open circuit voltage at the times of the plurality of times of traveling to select representative points from the estimation data acquired at each of the plurality of times of traveling of the vehicle, and apply the estimation data to the initial OCV curve or the OCV curve with the representative points serving as a reference to estimate discharge capacity values of the estimation data of the plurality of times of traveling and integrate the estimation data at the times of the plurality of times of traveling;
- and
- estimate the OCV curve by performing optimization calculation such that a value of an error function calculated on the basis of the estimated OCV curve and the estimation data is a threshold or less.
4 more elements
Dependencies are inferred from the claim text.