EP1271171A2
Expired / Lapsed
EP
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Method of detecting and resolving memory effect
Assignee: Toyota Motor Corp
•
Filing: 2002-06-19
•
Granted: —
•
Expires: 2022-06-19
Abstract
Abstract A method of detecting and resolving a memory effect capable of detecting the memory effect with ease and with high precision and resolving even when the vehicle is in motion is provided. A current in a secondary battery is detected, a variation ΔSOC in a residual battery capacity for a predetermined time period is calculated according to at least current integration by multiplying the detected current by a predetermined charge efficiency (S302), a temperature of the secondary battery is detected and a variation ΔV in a no-load voltage for the predetermined time period is calculated based on the detected current, and an internal resistance corresponding to the detected temperature and the SOC is calculated (S303). A ratio k of the variation in the no-load voltage to the variation in the residual battery capacity is calculated (S304). If the ratio exceeds a predetermined threshold value kst, then the battery is judged to have a memory effect (S307), and the usage range of the SOC is extended for a predetermined time period (S308) or the correction of the SOC using voltages is prohibited for a predetermined time period(S309).
Inventors
- 👤 Tadao Kimura
- 👤 Masayoshi Toyota
- 👤 Norito Yamabe
- 👤 Yusai Murakami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 14:30
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/0023; B60L3/0046; B60L50/00; B60L50/10; B60L50/16; B60L50/50; B60L50/60; B60L50/61; B60L53/00; B60L53/10; B60L53/14; B60L58/00; B60L58/10; B60L58/12; B60L58/13; B60L58/14; B60L58/18; B60L58/24; G; G01; G01R; G01R31/00; G01R31/36; G01R31/382; G01R31/3842; G01R31/385; B60L2240/00; B60L2240/40; B60L2240/54; B60L2240/545; B60L2240/547; B60L2240/549; B60L2240/80; G01R31/378; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/62; Y02T10/70; Y02T10/7072; Y02T90/00; Y02T90/10; Y02T90/14
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
160 words
A method for detecting a memory effect comprising the steps of: detecting a current flowing through a secondary battery configured
by combining a plurality of single cells into an assembled battery; performing an operation on a variation in a residual battery capacity
for a predetermined time period according to at least current integration by
multiplying the detected current by a predetermined charge efficiency; detecting a temperature of the secondary battery; calculating a variation in a no-load voltage for the predetermined
time period, based on the detected current and an internal resistance
corresponding to the detected temperature and the residual battery capacity
obtained by the operation; calculating a ratio of the variation in the no-load voltage to the
variation in the residual battery capacity; and if the ratio of the variation in the no-load voltage to the variation in
the residual battery capacity is not less than a predetermined threshold
value, judging as a memory effect occurring in the secondary battery.
Claim 2
Dependent Claim
33 words
The method for detecting a memory effect according to claim 1, wherein the predetermined charge efficiency is determined based on
the detected temperature and the residual battery capacity obtained by the
current operation.
Claim 3
Dependent Claim
29 words
The method for detecting a memory effect according to claim 1, wherein the predetermined threshold value is determined based on
a level of memory effect intended to be judged.
Claim 4
Independent Claim
207 words
A method for resolving a memory effect detected by a memory effect
detecting method that includes the steps of: detecting a current flowing
through a secondary battery configured by combining a plurality of single
cells into an assembled battery; performing an operation on a variation in a
residual battery capacity for a predetermined time period according to at
least current integration by multiplying the detected current by a
predetermined charge efficiency; detecting a temperature of the secondary
battery; calculating a variation in a no-load voltage for the predetermined
time period, based on the detected current and an internal resistance
corresponding to the detected temperature and the residual battery capacity
obtained by the operation; calculating a ratio of the variation in the no-load
voltage to the variation in the residual battery capacity; and if the ratio of
the variation in the no-load voltage to the variation in the residual battery
capacity is not less than a predetermined threshold value, judging as
memory effect occurring in the secondary battery, the method for resolving a memory effect comprising: if the battery
is judged to have a memory effect according to the memory effect detecting
method, setting a control range of the residual battery capacity broader
than a normal usage range.
Claim 5
Independent Claim
214 words
A method for resolving a memory effect detected by a memory effect
detecting method that includes the steps of: detecting a current flowing
through a secondary battery configured by combining a plurality of single
cells into an assembled battery; performing an operation on a variation in a
residual battery capacity for a predetermined time period according to at
least current integration by multiplying the detected current by a
predetermined charge efficiency; detecting a temperature of the secondary
battery; calculating a variation in a no-load voltage for the predetermined
time period, based on the detected current and an internal resistance
corresponding to the detected temperature and the residual battery capacity
obtained by the operation; calculating a ratio of the variation in the no-load
voltage to the variation in the residual battery capacity; and if the ratio of
the variation in the no-load voltage to the variation in the residual battery
capacity is not less than a predetermined threshold value, judging as a
memory effect occurring in the secondary battery, the method for resolving a memory effect comprising: if the battery
is judged to have a memory effect according to the memory effect detecting
method, prohibiting correction of a residual battery capacity obtained by the
operation based on a voltage variation for a predetermined time period.
Claim 6
Independent Claim
167 words
A method for detecting a memory effect comprising the steps of: detecting a current flowing through a secondary battery configured
by combining a plurality of single cells into an assembled battery and used
in a middle charge state; performing an operation on a variation in a residual battery capacity
for a predetermined time period according to at least current integration by
multiplying the detected current by a predetermined charge efficiency; detecting a temperature of the secondary battery; calculating a variation in a no-load voltage for the predetermined
time period, based on the detected current and an internal resistance
corresponding to the detected temperature and the residual battery capacity
obtained by the operation; calculating a ratio of the variation in the no-load voltage to the
variation in the residual battery capacity; and if the ratio of the variation in the no-load voltage to the variation in
the residual battery capacity is not less than a predetermined threshold
value, judging as a memory effect occurring in the secondary battery.
Claim 7
Dependent Claim
33 words
The method for detecting a memory effect according to claim 6, wherein the predetermined charge efficiency is determined based on
the detected temperature and the residual battery capacity obtained by the
current operation.
Claim 8
Dependent Claim
29 words
The method for detecting a memory effect according to claim 6, wherein the predetermined threshold value is determined based on
a level of memory effect intended to be judged.
Claim 9
Independent Claim
215 words
A method for resolving a memory effect detected by a memory effect
detecting method that includes the steps of: detecting a current flowing
through a secondary battery configured by combining a plurality of single
cells into an assembled battery and used in a middle charge state;
performing an operation on a variation in a residual battery capacity for a
predetermined time period according to at least current integration by
multiplying the detected current by a predetermined charge efficiency;
detecting a temperature of the secondary battery; calculating a variation in
a no-load voltage for the predetermined time period, based on the detected
current and an internal resistance corresponding to the detected
temperature and the residual battery capacity obtained by the operation;
calculating a ratio of the variation in the no-load voltage to the variation in
the residual battery capacity; and if the ratio of the variation in the no-load
voltage to the variation in the residual battery capacity is not less than a
predetermined threshold value, judging as a memory effect occurring in the
secondary battery, the method for resolving a memory effect comprising: if the battery
is judged to have a memory effect according to the memory effect detecting
method, setting a control range of the residual battery capacity broader
than a normal usage range.
Claim 10
Independent Claim
221 words
A method for resolving a memory effect detected by a memory effect
detecting method that includes the steps of: detecting a current flowing
through a secondary battery configured by combining a plurality of single
cells into an assembled battery and used in a middle charge state;
performing an operation on a variation in a residual battery capacity for a
predetermined time period according to at least current integration by
multiplying the detected current by a predetermined charge efficiency;
detecting a temperature of the secondary battery; calculating a variation in
a no-load voltage for the predetermined time period, based on the detected
current and an internal resistance corresponding to the detected
temperature and the residual battery capacity obtained by the operation;
calculating a ratio of the variation in the no-load voltage to the variation in
the residual battery capacity; and if the ratio of the variation in the no-load
voltage to the variation in the residual battery capacity is not less than a
predetermined threshold value, judging as a memory effect occurring in the
secondary battery, the method for resolving a memory effect comprising: if the battery
is judged to have a memory effect according to the memory effect detecting
method, prohibiting correction of a residual battery capacity obtained by the
operation based on a voltage variation for a predetermined time period.
Claim 11
Independent Claim
157 words
A method for detecting a memory effect comprising the steps of: detecting a current flowing through a secondary battery configured
by combining a plurality of single cells into an assembled battery; detecting an output voltage from the secondary battery while
associating the output voltage with the detected current; calculating a no-load voltage at the detected current being zero,
based on a variation in the output voltage with respect to the detected
current for a predetermined time period; performing an operation on a residual battery capacity for the
predetermined time period according to at least current integration by
multiplying the detected current by a predetermined charge efficiency, based
on the calculated no-load voltage; calculating a correlation coefficient between the no-load voltage and
the residual battery capacity obtained by the operation in a predetermined
variation range; and if the correlation coefficient is not more than a predetermined
threshold value, judging as a memory effect occurring in the secondary
battery.
Claim 12
Dependent Claim
42 words
The method for detecting a memory effect according to claim 11, wherein a temperature of the secondary battery is detected, and the
predetermined charge efficiency is determined based on the detected
temperature and the residual battery capacity obtained by the current
operation.
Claim 13
Dependent Claim
50 words
The method for detecting a memory effect according to claim 11, wherein the calculation of the no-load voltage is carried out when a
deviation of the output voltage corresponding to the detected current within
predetermined ranges in a charge direction and a discharge direction is
within a predetermined variance range.
Claim 14
Dependent Claim
29 words
The method for detecting a memory effect according to claim 11, wherein the predetermined threshold value is determined based on
a level of memory effect intended to be judged.
Claim 15
Independent Claim
264 words
A method for resolving a memory effect detected by a memory effect
detecting method that includes the steps of: detecting a current flowing
through a secondary battery configured by combining a plurality of single
cells into an assembled battery; detecting an output voltage from the
secondary battery while associating the output voltage with the detected
current; calculating a no-load voltage at the detected current being zero,
based on a variation in the output voltage with respect to the detected
current for a predetermined time period; performing an operation on a
residual battery capacity for the predetermined time period according to at
least current integration by multiplying the detected current by a
predetermined charge efficiency, based on the calculated no-load voltage;
calculating a correlation coefficient between the no-load voltage and the
residual battery capacity obtained by the operation in a predetermined
variation range; and if the correlation coefficient is not more than a
predetermined threshold value, judging as a memory effect occurring in the
secondary battery, the method for resolving a memory effect comprising: if the battery is judged to have a memory effect according to the
memory effect detecting method, calculating an area formed by a variation
curve of the no-load voltage versus a residual battery capacity in a normal
usage range, and based on a difference between the area and an area formed by a
variation curve of the no-load voltage versus a residual battery capacity in
the normal usage range when a memory effect does not occur, setting a
control range of the residual battery capacity broader than the normal usage
range.
Claim 16
Independent Claim
270 words
A method for resolving a memory effect detected by a memory effect
detecting method that includes the steps of: detecting a current flowing
through a secondary battery configured by combining a plurality of single
cells into an assembled battery; detecting an output voltage from the
secondary battery while associating the output voltage with the detected
current; calculating a no-load voltage at the detected current being zero,
based on a variation in the output voltage with respect to the detected
current for a predetermined time period; performing an operation on a
residual battery capacity for the predetermined time period according to at
least current integration by multiplying the detected current by a
predetermined charge efficiency, based on the calculated no-load voltage;
calculating a correlation coefficient between the no-load voltage and the
residual battery capacity obtained by the operation in a predetermined
variation range; and if the correlation coefficient is not more than a
predetermined threshold value, judging as a memory effect occurring in the
secondary battery, the method for resolving a memory effect comprising: if the battery is judged to have a memory effect according to the
memory effect detecting method, calculating an area formed by a variation
curve of the no-load voltage versus a residual battery capacity in a normal
usage range, and based on a difference between the area and an area formed by a
variation curve of the no-load voltage versus a residual battery capacity in
the normal usage range when a memory effect does not occur, prohibiting
correction of a residual battery capacity obtained by the operation based on
a voltage variation for a predetermined time period.
Claim 17
Independent Claim
164 words
A method for detecting a memory effect comprising the steps of: detecting a current flowing through a secondary battery configured
by combining a plurality of single cells into an assembled battery and used
in a middle charge state; detecting an output voltage from the secondary battery while
associating the output voltage with the detected current; calculating a no-load voltage at the detected current being zero,
based on a variation in the output voltage with respect to the detected
current for a predetermined time period; performing an operation on a residual battery capacity for the
predetermined time period according to at least current integration by
multiplying the detected current by a predetermined charge efficiency, based
on the calculated no-load voltage; calculating a correlation coefficient between the no-load voltage and
the residual battery capacity obtained by the operation in a predetermined
variation range; and if the correlation coefficient is not more than a predetermined
threshold value, judging as a memory effect occurring in the secondary
battery.
Claim 18
Dependent Claim
42 words
The method for detecting a memory effect according to claim 17, wherein a temperature of the secondary battery is detected, and the
predetermined charge efficiency is determined based on the detected
temperature and the residual battery capacity obtained by the current
operation.
Claim 19
Dependent Claim
50 words
The method for detecting a memory effect according to claim 17, wherein the calculation of the no-load voltage is carried out when a
deviation of the output voltage corresponding to the detected current within
predetermined ranges in a charge direction and a discharge direction is
within a predetermined variance range.
Claim 20
Dependent Claim
29 words
The method for detecting a memory effect according to claim 17, wherein the predetermined threshold value is determined based on
a level of memory effect intended to be judged.
Claim 21
Independent Claim
271 words
A method for resolving a memory effect detected by a memory effect
detecting method that includes the steps of: detecting a current flowing
through a secondary battery configured by combining a plurality of single
cells into an assembled battery and used in a middle charge state; detecting
an output voltage from the secondary battery while associating the output
voltage with the detected current; calculating a no-load voltage at the
detected current being zero, based on a variation in the output voltage with
respect to the detected current for a predetermined time period; performing
an operation on a residual battery capacity for the predetermined time
period according to at least current integration by multiplying the detected
current by a predetermined charge efficiency, based on the calculated
no-load voltage; calculating a correlation coefficient between the no-load
voltage and the residual battery capacity obtained by the operation in a
predetermined variation range; and if the correlation coefficient is not more
than a predetermined threshold value, judging as a memory effect occurring
in the secondary battery, the method for resolving a memory effect comprising: if the battery is judged to have a memory effect according to the
memory effect detecting method, calculating an area formed by a variation
curve of the no-load voltage versus a residual battery capacity in a normal
usage range, and based on a difference between the area and an area formed by a
variation curve of the no-load voltage versus a residual battery capacity in
the normal usage range when a memory effect does not occur, setting a
control range of the residual battery capacity broader than the normal usage
range.
Claim 22
Independent Claim
278 words
A method for resolving a memory effect detected by a memory effect
detecting method that includes the steps of: detecting a current flowing
through a secondary battery configured by combining a plurality of single
cells into an assembled battery and used in a middle charged state;
detecting an output voltage from the secondary battery while associating
the output voltage with the detected current; calculating a no-load voltage
at the detected current being zero, based on a variation in the output
voltage with respect to the detected current for a predetermined time period;
performing an operation on a residual battery capacity for the
predetermined time period according to at least current integration by
multiplying the detected current by a predetermined charge efficiency, based
on the calculated no-load voltage; calculating a correlation coefficient
between the no-load voltage and the residual battery capacity obtained by
the operation in a predetermined variation range; and if the correlation
coefficient is not more than a predetermined threshold value, judging as a
memory effect occurring in the secondary battery, the method for resolving a memory effect comprising: if the battery is judged to have a memory effect according to the
memory effect detecting method, calculating an area formed by a variation
curve of the no-load voltage versus to a residual battery capacity in a normal
usage range, and based on a difference between the area and an area formed by a
variation curve of the no-load voltage versus a residual battery capacity in
the normal usage range when a memory effect does not occur, prohibiting
correction of a residual battery capacity obtained by the operation based on
a voltage variation for a predetermined time period.
References Cited (Backward Citations)
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