Battery capacity measurement
First Claim
1. A method of obtaining information relating to the charge capacity of one or more cells including:
- measuring a variable cell parameter, or change in the variable cell parameter, for at least part of a Coup de Fouet discharge period during which the cell(s) voltage initially decreases to a trough voltage and then increases to a plateau voltage; and
relating the variable cell parameter, or change in the variable cell parameter, to reference information to obtain the absolute or relative charge capacity of the cell or cells.
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Accused Products
Abstract
A method of obtaining information relating to the charge capacity of one or more cells utilizing information from the initial discharge period of the cell or cells. The method involves measuring a variable cell parameter for at least a part of an initial period of discharge during which the cell voltage initially decreases to a through voltage and then increases to a plateau voltage (the Coup De Fouet period), and relating the variable cell parameter to reference information to obtain the absolute or relative charge capacity of the cell or cells. An estimation model for predicting the absolute or relative capacity of a battery includes input for a variable battery parameter and one or more battery operating conditions and/or battery condition, reference information, compensation means determining a correction factor for the variable battery parameter, and calculation means relating corrected variable battery parameter to absolute or relative battery capacity.
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Citations
64 Claims
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1. A method of obtaining information relating to the charge capacity of one or more cells including:
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measuring a variable cell parameter, or change in the variable cell parameter, for at least part of a Coup de Fouet discharge period during which the cell(s) voltage initially decreases to a trough voltage and then increases to a plateau voltage; and
relating the variable cell parameter, or change in the variable cell parameter, to reference information to obtain the absolute or relative charge capacity of the cell or cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 40)
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11. A method of estimating the capacity of a battery including:
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acquiring reference information relating a variable battery parameter, or change in a variable battery parameter, to one or more battery operating conditions or battery condition;
measuring the variable battery parameter, or change in the variable battery parameter, during at least part of a Coup de Fouet discharge period of the battery during which the voltage initially decreases to a trough voltage and then increases to a plateau voltage; and
relating the variable battery parameter, or change in variable battery parameter, to reference information to obtain the absolute or relative charge capacity of the battery. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An estimation model for predicting the absolute or relative capacity of a battery, including:
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input for a variable battery parameter, and one or more battery operating conditions or battery condition, measured during at least part of a Coup de Fouet discharge period during which the battery output voltage initially decreases to a trough voltage and then increases to a plateau voltage;
reference information relating the variable battery parameter to one or more battery operating conditions or battery condition;
compensation means determining a correction factor for the variable battery parameter depending on the value of any one of battery operating conditions or battery condition; and
calculation means relating corrected variable battery parameter to the reference information to obtain the absolute or relative charge capacity of the battery. - View Dependent Claims (23, 24, 25, 26, 27, 28, 39)
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29. An apparatus adapted to provide information relating to the charge capacity of a battery, including:
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measurement means adapted to measure a variable battery parameter, or change in variable battery parameter during at least part of a Coup de Fouet discharge period during which the battery voltage initially decreases to a trough voltage and then increases to a plateau voltage; and
processing means adapted to relate the variable battery parameter, or change in variable battery parameter, to referenced information to obtain the absolute or relative charge capacity of the battery. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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41. A method of estimating capacity of an electrochemical energy storage cell, the method comprising:
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obtaining a Coup de Fouet parameter value for the cell; and
estimating a charge capacity of the cell from the Coup de Fouet parameter value. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55)
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50. An apparatus for estimating capacity of an electrochemical energy storage cell, comprising:
a computer configured to estimate a charge capacity of the cell from a Coup de Fouet parameter value. - View Dependent Claims (56, 57, 58)
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59. A computer program product comprises computer readable code embodied in a computer-readable storage medium, the computer readable code comprising:
code configured to estimate a charge capacity of the cell from the Coup de Fouet parameter value. - View Dependent Claims (60, 61, 62, 63, 64)
Specification