Device and method for evaluating energy storage device and evaluation system

Patent metadata

Field	Value
Publication number	US-2020217896-A1
Application number	US-201916567011-A
Country	US
Kind code	A1
Filing date	Sep 11, 2019
Priority date	Jan 4, 2019
Publication date	Jul 9, 2020
Grant date	—

Abstract

According to one embodiment, a device for evaluating an energy storage device includes first processing circuitry and second processing circuitry. The first processing circuitry detects a plurality of times at which an amount of charge of the energy storage device satisfies a threshold condition, based on measurement data on the energy storage device in operation, selects a plurality of time intervals, calculates a charge-discharge efficiency in each of the time intervals based on charge-discharge command values belonging to the time interval, and divides a set of the charge-discharge efficiencies into a plurality of clusters and generates characteristic information on the clusters based on at least one of the measurement data and the charge-discharge command values. The second processing circuitry generates output data for displaying: transition data indicating transition of the charge-discharge efficiency belonging to the cluster; and characteristic information on the cluster.

First claim

1 . A device for evaluating an energy storage device, comprising:
first processing circuitry configured to:
detect a plurality of times at which an amount of charge of the energy storage device satisfies a threshold condition, based on measurement data on the energy storage device in operation, the energy storage device being configured to perform charge or discharge according to charge-discharge command values designating charge or discharge;
select a plurality of time intervals based on the plurality of times detected;
calculate a charge-discharge efficiency in each of the time intervals based on charge-discharge command values belonging to the time interval;
divide a set of the charge-discharge efficiencies into a plurality of clusters;
generate characteristic information on the clusters based on at least one of the measurement data and the charge-discharge command values; and
second processing circuitry configured to generate output data for displaying:
transition data indicating transition of the charge-discharge efficiency belonging to the cluster; and
characteristic information on the cluster.

2 . The device according to claim 1 , comprising
a display configured to display the output data.

3 . The device according to claim 1 ,
wherein the threshold condition includes that the amount of charge reaches a threshold, or enters a certain range with respect to the threshold.

4 . The device according to claim 3 ,
wherein the threshold is a predetermined value of a ratio between the amount of charge of the energy storage device and a rated capacity of the energy storage device.

5 . The device according to claim 1 ,
wherein the first processing circuitry generates a distribution of the amounts of charge based on the measurement data, and determines the threshold condition based on the distribution.

6 . The device according to claim 1 ,
wherein the transition data includes data associating the charge-discharge efficiency with the time.

7 . The device according to claim 1 ,
wherein the transition data includes data associating the charge-discharge efficiency with an accumulated amount of discharge of the energy storage device or wherein the transition data includes data associating the charge-discharge efficiency with an accumulated amount of charge of the energy storage device.

8 . The device according to claim 1 ,
wherein the first circuitry generates a function of approximating the cluster, and the transition data includes a graph of the function.

9 . The device according to claim 1 ,
wherein the first processing circuitry calculates a standard deviation of at least one of: the charge-discharge command values belonging to the time interval; and the measurement data belonging to the time interval, and wherein the first processing circuitry generates statistical information associated with the standard deviation, the generated statistical information being the characteristic information on the cluster.

10 . The device according to claim 1 ,
wherein the first processing circuitry calculates information on a slope of a line approximating the cluster, the calculated information being the characteristic information on the cluster.

11 . The device according to claim 1 ,
wherein the first processing circuitry selects an interval where a time difference between the times is equal to or more than a predetermined value, the selected interval being the time interval.

12 . The device according to claim 11 ,
wherein the interval where the time difference between the times is equal to or more than the predetermined value is an interval where the number of samples of the measurement data is equal to or more than the predetermined value.

13 . The device according to claim 1 ,
wherein the first processing circuitry selects an interval where a total of lengths of periods during which neither charge nor discharge is designated by the charge-discharge command values is equal to or less than a predetermined value, the selected interval being the time interval.

14 . The device according to claim 1 ,
wherein the first processing circuitry selects an interval where a difference between a mean value of the amounts of charge and a threshold is equal to or less than a predetermined value, the selected interval being the time interval.

15 . The device according to claim 1 ,
wherein the threshold condition includes that the amount of charge reaches a first threshold or a second threshold, wherein processes of the first processing circuitry and the second processing circuitry are performed for each of the first threshold and the second threshold, and wherein characteristic information on the cluster based on the first threshold includes information identifying the first threshold, and wherein characteristic information on the cluster based on the second threshold includes information identifying the second threshold.

16 . The device according to claim 1 ,
wherein the first processing circuitry corrects the charge-discharge efficiency based on the measurement data belonging to the time interval for which the charge-discharge efficiency is calculated, wherein the measurement data includes a temperature.

17 . A method for evaluating an energy storage device, comprising:
detecting a plurality of times at which an amount of charge of the energy storage device satisfies a threshold condition, based on measurement data on the energy storage device in operation, the energy storage device being configured to perform charge or discharge according to charge-discharge command values designating charge or discharge; selecting a plurality of time intervals based on the plurality of times detected; calculating a charge-discharge efficiency in each of the time intervals based on charge-discharge command values belonging to the time interval; dividing a set of the charge-discharge efficiencies into a plurality of clusters; generating characteristic information on the clusters based on at least one of the measurement data and the charge-discharge command values; and generating output data for displaying:
transition data indicating transition of the charge-discharge efficiency belonging to the cluster; and
characteristic information on the cluster.

18 . An evaluation system, comprising:
an energy storage device configured to perform charge or discharge according to charge-discharge command values designating charge or discharge; and an evaluation device for the energy storage device, wherein the evaluation device comprises: first processing circuitry configured to:
detect a plurality of times at which an amount of charge of the energy storage device satisfies a threshold condition, based on measurement data on the energy storage device in operation;
select a plurality of time intervals based on the plurality of times detected;
calculate a charge-discharge efficiency in each of the time intervals based on charge-discharge command values belonging to the time interval;
divide a set of the charge-discharge efficiencies into a plurality of clusters;
generate characteristic information on the clusters based on at least one of the measurement data and the charge-discharge command values; and
second processing circuitry configured to generate output data for displaying:
transition data indicating transition of the charge-discharge efficiency belonging to the cluster; and
characteristic information on the cluster.

Assignees

• Toshiba Kk
• Toshiba Energy Systems & Solutions Corp

Inventors

• Hatano Hisaaki
• Yamamoto Takahiro
• Fujiwara Kenichi
• Sakuma Masatake
• Kobayashi Takenori
• Ogura Yasuhiro
• Mitsumoto Kenji

Classifications

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• G01R31/371

  with remote indication, e.g. on external chargers · CPC title

• G01R31/392

  Determining battery ageing or deterioration, e.g. state of health · CPC title

• G01R19/2513

  Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging · CPC title

• H01M10/4285 Primary

  Testing apparatus · CPC title