Estimating condition of battery, related system and vehicle

Patent metadata

Field	Value
Publication number	US-10732228-B2
Application number	US-201414168041-A
Country	US
Kind code	B2
Filing date	Jan 30, 2014
Priority date	Jan 31, 2013
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

An apparatus for estimating a condition of a battery includes a mode identifying unit configured to identify a usage mode of the battery during a period of time and its corresponding attenuation curve, according to recorded data on battery usage, stored usage modes of the battery and attenuation curves corresponding to the various usage modes, the attenuation curve representing a change of a fully charged capacity of the battery with battery usage; and a condition estimating unit configured to calculate battery degradation according to the recorded data, the identified usage mode and its corresponding attenuation curve, the degradation representing a quantity of the fully charged capacity of the battery that is reduced over the battery usage. The condition of the battery is estimated so as to rationally judge the residual value of the battery in operation.

First claim

What is claimed is:

1. A method comprising:
measuring and recording a set of data during a period of time including a charge level of a battery during the period of time and dividing the period of time into a plurality of time segments according to changes of a charge state of the battery with time;
for each of the plurality of time segments in the period of time:
determining a subset of data for that particular time segment including a charging capacity of the battery at an end of that particular time segment, a temperature of the battery during that particular time segment, and a final voltage of the battery at the end of that particular time segment;
identifying a usage mode of the battery during that particular time segment by comparing the subset of data for that particular time segment to a plurality of stored usage modes of the battery;
identifying an attenuation curve corresponding to the usage mode of the battery during that particular time segment, wherein the attenuation curve represents a change of a fully charged capacity of the battery over battery usage during that particular time segment for the usage mode; and
calculating a degradation of the battery during that particular time segment based on the subset of data for that particular time segment;

calculating a degradation of the battery according to the set of data over the period of time, the usage mode during each of the plurality of time segments, and the attenuation curves, the calculation being based on the degradation of the battery during each of the plurality of time segments calculated in order of the time segments, wherein the degradation represents a quantity of the fully charged capacity of the battery that is reduced over the battery usage during the period of time;
recharging the battery by a charging station at the end of the period of time; and
billing an adjusted amount to a user of the battery for an amount of electricity to recharge the battery by the charging station, the adjusted amount being determined based at least in part on a depreciation expense of the battery in combination with an expense to charge the battery, the depreciation expense being based on the degradation of the battery, such that a billed amount for recharging the battery decreases as the degradation of the battery progresses, the adjusted amount rationally representing a residual value of the battery for rational billing.

2. The method of claim 1 , wherein the subset of data for each of the plurality of time segments in the period of time further comprises at least one of: a start time of the battery usage of that particular time segment, an end time of the battery usage of that particular time segment, an initial voltage of the battery usage of that particular time segment, a charge current during that particular time segment, a discharge current during that particular time segment, an idle time of that particular time segment, and a depth of discharge during that particular time segment, the depth of discharge representing a quantity of electricity energy of the battery before entering an idle mode.

3. The method of claim 2 , wherein, in the case that the usage mode during that particular time segment is a charging mode, the degradation of the battery during that particular time segment is calculated according to a charge level L of that particular time segment, a charging capacity δ e of that particular time segment, a temperature T during that particular time segment, an initial charging voltage U a of that particular time segment, and a final charging voltage U b of that particular time segment, the degradation of the battery being calculated by:
calculating the charging capacity δ e , of that particular time segment according to a start time of charging t a of that particular time segment, an end time of charging t b of that particular time segment and a charge current l c of that particular time segment;
searching stored charging modes of the battery and attenuation curves corresponding to the stored charging modes for a set {M a } of all charging modes of the stored charging modes that match the charge level L of that particular time segment, the initial charging voltage U a of that particular time segment and the temperature T during that particular time segment, and a set {M b } of all charging modes of the stored charging modes that match the charge level L of that particular time segment, the final charging voltage U b of that particular time segment, and the temperature T during that particular time segment;
searching the set {M b } and the set {M a } respectively for a mode mb for that particular time segment and a mode ma for that particular time segment such that a difference between a charging capacity of the mode mb and a charging capacity of the mode ma is equal to the charging capacity δ e for that particular time segment;
according to attenuation curves f a and f b respectively corresponding to the mode m a of that particular time segment and the mode mb of that particular time segment, calculating slopes s a and s b respectively of the attenuation curves f a and f b at a point c=c a , wherein c a represents a fully charged capacity of the battery at the start time of charging t a of that particular time segment, and slope s a and slope s b of that particular time segment respectively represent degradation of the battery during that particular time, the degradation being caused by charging the battery from a standard cutoff voltage to the initial charging voltage U a of that particular time segment and the final charging voltage U b of that particular time segment under a condition of the charge current I c of that particular time segment and the temperature T during that particular time segment; and
calculating the degradation of the battery during that particular time segment as s=s b −s a , and obtaining the fully charged capacity of the battery at the end time of charging t b of that particular time segment as c b =c a +s.

4. The method of claim 3 , further comprising:
calculating a rate of depreciation D r for that particular time segment,

D
R

=

c
a

-

c
b

c
o

-

c
e

being caused by using the battery once, where c o is a factory capacity of the battery and c e is a scrap capacity of the battery.

5. The method of claim 3 , further comprising:
calculating a remaining quantity of electricity energy of the battery for that particular time segment according to the plurality of stored usage modes of the battery and efficiencies corresponding to the plurality of stored usage modes, wherein the remaining quantity of electricity energy of the battery is obtained by accumulating changes of the remaining quantity of electricity energy of the battery caused by battery usage during that particular time segment on the basis of a factory electricity energy e o of the battery.

6. The method of claim 5 , wherein, in the case that the usage mode during that particular time segment is a charging mode, the remaining quantity of electricity energy of the battery for that particular time segment is calculated by:
calculating the charging capacity δ e of that

Assignees

• Utopus Insights Inc

Inventors

• Dong Jin
• Gammons Carlton
• Shao Jin Yan
• Tian Qi Ming
• Xie Ming
• Yin Wen Jun
• Yu hong guang
• Zhao Li Li

Classifications

• G01R31/367

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G01R31/392 Primary

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