EP1265335A2
Expired / Lapsed
EP
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Method and apparatus for controlling residual battery capacity of secondary battery
Assignee: Panasonic Corp
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Filing: 2002-06-06
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Granted: —
•
Expires: 2022-06-06
Abstract
Abstract A method for controlling a residual battery capacity of a secondary battery, by which the precision of the energy management of the system can be improved substantially, is provided. A current flowing through the battery is detected and the detected current is multiplied by a predetermined charge efficiency so that an operation on a residual battery capacity is performed at least by current integration (S201), an output voltage from the battery is detected and an average of the output voltages detected for a predetermined time period is calculated (S202), an average of the residual battery capacities obtained by the operation for a predetermined time period is calculated (S203), a reference voltage corresponding to the calculated average of residual battery capacities is referred to (S204), the reference voltage and the average voltage is compared (S205), and the predetermined charge efficiency is set variably based on a result of the comparison (S206).
Inventors
- 👤 Tadao Kimura
- 👤 Masayoshi Toyota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 05:59
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/36; G01R31/382; G01R31/3828; G01R31/367
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
126 words
A method for controlling a residual battery capacity of a secondary
battery, comprising: detecting a current flowing through the secondary battery to
perform an operation on a residual battery capacity by multiplying the
detected current by a predetermined charge efficiency; detecting an output voltage from the secondary battery to calculate
an average voltage value of output voltages detected for a predetermined
period of time; calculating an average value of residual battery capacities obtained
by the operation for the predetermined period of time; referring to a reference voltage value of the secondary battery
corresponding to the calculated average value of residual battery capacities; comparing the reference voltage value and the average voltage
value; and setting the predetermined charge efficiency variably, based on a
result of the comparison.
Claim 2
Dependent Claim
47 words
The method for controlling a residual battery capacity of a secondary
battery according to claim 1, wherein an average value of no-load voltages of the secondary
battery is calculated for the predetermined period of time, and the
calculated average value is set as the average voltage value.
Claim 3
Dependent Claim
82 words
The method for controlling a residual battery capacity of a secondary
battery according to claim 1, wherein as the result of the comparison, if the average voltage value
is higher than the reference voltage value, then the predetermined charge
efficiency is increased, if the average voltage value is lower than the reference voltage value,
then the predetermined charge efficiency is decreased, and if the average voltage value is equal to the reference voltage value,
then the predetermined charge efficiency is not changed.
Claim 4
Dependent Claim
43 words
The method for controlling a residual battery capacity of a secondary
battery according to claim 3, wherein the increase or the decrease in the predetermined charge
efficiency is conducted by adding, subtracting, or multiplying a constant
with respect to the predetermined charge efficiency.
Claim 5
Dependent Claim
57 words
The method for controlling a residual battery capacity of a secondary
battery according to claim 3, wherein the increase or the decrease in the predetermined charge
efficiency is conducted by adding, subtracting, or multiplying a value
corresponding to a difference between the average voltage value and the
reference voltage value with respect to the predetermined charge efficiency.
Claim 6
Dependent Claim
44 words
The method for controlling a residual battery capacity of a secondary
battery according to claim 1, wherein a temperature of the secondary battery is detected and the
predetermined charge efficiency is determined based on the detected
temperature and a currently calculated residual battery capacity.
Claim 7
Dependent Claim
45 words
The method for controlling a residual battery capacity of a secondary
battery according to claim 1, wherein a temperature of the secondary battery is detected and the
reference voltage value is determined based on the detected temperature
and the average value of residual battery capacities.
Claim 8
Dependent Claim
220 words
A residual battery capacity control apparatus for a secondary battery,
comprising: a current detection unit that detects a current flowing through the
secondary battery; a residual battery capacity operation unit that performs an
operation on a residual battery capacity by multiplying a current signal
from the current detection unit by a predetermined charge efficiency; a voltage detection unit that detects an output voltage from the
secondary battery; an average voltage calculation unit that calculates an average
voltage value of voltage signals output from the voltage detection unit for a
predetermined period of time; an average residual battery capacity calculation unit that calculates
an average value of residual battery capacities obtained by the operation by
the residual battery capacity operation unit for a predetermined period of
time; a reference voltage storage unit that stores a reference voltage value
of the secondary battery, corresponding to the average value of residual
battery capacities obtained from the average residual battery capacity
calculation unit; a comparison unit that compares the average voltage value obtained
from the average voltage calculation unit and the reference voltage value
obtained from the reference voltage storage unit; and a charge efficiency setting unit that sets the predetermined charge
efficiency variably with respect to the residual battery capacity operation
unit, based on a result of the comparison by the comparison unit.
Claim 9
Dependent Claim
28 words
The residual battery capacity control apparatus for a secondary
battery according to claim 8, wherein the average voltage calculation unit calculates an average
value of no-load voltage signals.
Claim 10
Dependent Claim
97 words
The residual battery capacity control apparatus for a secondary
battery according to claim 8, wherein, as the result of the comparison by the comparison unit, if
the average voltage value is higher than the reference voltage value, then
the charge efficiency setting unit increases the predetermined charge
efficiency, if the average voltage value is lower than the reference voltage value, then the charge efficiency setting unit decreases the predetermined charge
efficiency, and if the average voltage value is equal to the reference voltage value,
then the charge efficiency setting unit does not change the predetermined
charge efficiency.
Claim 11
Dependent Claim
41 words
The residual battery capacity control apparatus for a secondary
battery according to claim 10, wherein the charge efficiency setting unit increases or decreases the
predetermined charge efficiency by adding, subtracting, or multiplying a
constant with respect to the predetermined charge efficiency.
Claim 12
Dependent Claim
55 words
The residual battery capacity control apparatus for a secondary
battery according to claim 10, wherein the charge efficiency setting unit increases or decreases the
predetermined charge efficiency by adding, subtracting, or multiplying a
value corresponding to a difference between the average voltage value and
the reference voltage value with respect to the predetermined charge
efficiency.
Claim 13
Dependent Claim
68 words
The residual battery capacity control apparatus for a secondary
battery according to claim 8, further comprising: a temperature detection unit that detects a temperature in the
secondary battery, wherein the charge efficiency setting unit comprises a charge
efficiency storage unit that stores a charge efficiency corresponding to a
temperature signal from the temperature detection unit and a current
residual battery capacity from the residual battery capacity operation unit.
Claim 14
Dependent Claim
65 words
The residual battery capacity control apparatus for a secondary
battery according to claim 8, further comprising: a temperature detection unit that detects a temperature in the
secondary battery, wherein the reference voltage storage unit stores the reference
voltage value corresponding to a temperature signal from the temperature
detection unit and an average value of residual battery capacities from the
average residual battery capacity calculation unit.
Claim 15
Dependent Claim
247 words
A residual battery capacity control apparatus for a secondary battery,
comprising: a battery pack composed of a combination of a plurality of electric
cells, each of which is a secondary battery, and used in a middle charged
state, a current detection unit that detects a current flowing through the
battery pack; a residual battery capacity operation unit that performs an
operation on a residual battery capacity by multiplying a current signal
from the current detection unit by a predetermined charge efficiency; a voltage detection unit that detects an output voltage from the
battery pack; an average voltage calculation unit that calculates an average
voltage value of voltage signals output from the voltage detection unit for a
predetermined period of time; an average residual battery capacity calculation unit that calculates
an average value of residual battery capacities obtained by the operation by
the residual battery capacity operation unit for a predetermined period of
time; a reference voltage storage unit that stores a reference voltage value
of each secondary battery, corresponding to the average value of residual
battery capacities obtained from the average residual battery capacity
calculation unit; a comparison unit that compares the average voltage value obtained
from the average voltage calculation unit and the reference voltage value
obtained from the reference voltage storage unit; and a charge efficiency setting unit that sets the predetermined charge
efficiency variably with respect to the residual battery capacity operation
unit, based on a result of the comparison by the comparison unit.
Claim 16
Dependent Claim
28 words
The residual battery capacity control apparatus for a secondary
battery according to claim 15, wherein the average voltage calculation unit calculates an average
value of no-load voltage signals.
Claim 17
Dependent Claim
97 words
A residual battery capacity control apparatus for a secondary
battery according to claim 15, wherein, as the result of the comparison by the comparison unit, if
the average voltage value is higher than the reference voltage value, then
the charge efficiency setting unit increases the predetermined charge
efficiency, if the average voltage value is lower than the reference voltage value,
then the charge efficiency setting unit decreases the predetermined charge
efficiency, and if the average voltage value is equal to the reference voltage value,
then the charge efficiency setting unit does not change the predetermined
charge efficiency.
Claim 18
Dependent Claim
41 words
A residual battery capacity control apparatus for a secondary
battery according to claim 17, wherein the charge efficiency setting unit increases or decreases the
predetermined charge efficiency by adding, subtracting, or multiplying a
constant with respect to the predetermined charge efficiency.
Claim 19
Dependent Claim
55 words
A residual battery capacity control apparatus for a secondary
battery according to claim 17, wherein the charge efficiency setting unit increases or decreases the
predetermined charge efficiency by adding, subtracting, or multiplying a
value corresponding to a difference between the average voltage value and
the reference voltage value with respect to the predetermined charge
efficiency.
Claim 20
Dependent Claim
68 words
A residual battery capacity control apparatus for a secondary
battery according to claim 15, further comprising: a temperature detection unit that detects a temperature in the
secondary battery, wherein the charge efficiency setting unit comprises a charge
efficiency storage unit that stores a charge efficiency corresponding to a
temperature signal from the temperature detection unit and a current
residual battery capacity from the residual battery capacity operation unit.
Claim 21
Dependent Claim
65 words
A residual battery capacity control apparatus for a secondary
battery according to claim 15, further comprising: a temperature detection unit that detects a temperature in the
secondary battery, wherein the reference voltage storage unit stores the reference
voltage value corresponding to a temperature signal from the temperature
detection unit and an average value of residual battery capacities from the
average residual battery capacity calculation unit.
References Cited (Backward Citations)
No citation records indexed.
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