Maximum and minimum power limit calculator for batteries and battery subpacks
First Claim
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1. A system for determining an operating limit of at least one battery, comprising:
- a voltage module that measures a voltage V across at least one battery during first and second periods;
a current sensor that measures current I supplied by the at least one battery during said first and second periods; and
a limit module that estimates a sum of a polarization voltage VP and an open circuit voltage V0 of the at least one battery at said second period based on said voltage V and current I of the at least one battery at said first period and an ohmic resistance R0 of the at least one battery and wherein said limit module calculates at least one of a maximum current limit Imax and/or a minimum current Imin limit for the at least one battery at said second period based on said sum, at least one of a maximum voltage limit Vmax and/or a minimum voltage limit Vmin, respectively, and said ohmic resistance R0 of the at least one battery.
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Abstract
A system for determining an operating limit of at least one battery according to some embodiments of the present invention comprises a voltage module that measures a voltage V across at least one battery during first and second periods. A current sensor that measures current I supplied by the at least one battery during the first and second periods. A limit module estimates a sum of a polarization voltage VP and an open circuit voltage V0 of the at least one battery at the second period based on the voltage V and current I of the at least one battery at the first period and an ohmic resistance R0 of the at least one battery.
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Citations
23 Claims
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1. A system for determining an operating limit of at least one battery, comprising:
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a voltage module that measures a voltage V across at least one battery during first and second periods; a current sensor that measures current I supplied by the at least one battery during said first and second periods; and a limit module that estimates a sum of a polarization voltage VP and an open circuit voltage V0 of the at least one battery at said second period based on said voltage V and current I of the at least one battery at said first period and an ohmic resistance R0 of the at least one battery and wherein said limit module calculates at least one of a maximum current limit Imax and/or a minimum current Imin limit for the at least one battery at said second period based on said sum, at least one of a maximum voltage limit Vmax and/or a minimum voltage limit Vmin, respectively, and said ohmic resistance R0 of the at least one battery. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for determining an operating limit of a battery, comprising:
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a voltage module that measures voltage V across at least one battery at first and second periods; a current sensor that measures current I supplied by the at least one battery at said first and second periods; and a limit module that estimates a sum of a polarization voltage VP and an open circuit voltage V0 of the at least one battery at said second period based on said voltage V and current I of the at least one battery at said first period and an ohmic resistance R0 of the at least one battery and wherein said limit module calculates at least one of a maximum voltage limit Vmax and/or a minimum voltage limit Vmin for the at least one battery at said second period based on said sum, at least one of a maximum current limit Imax and/or a minimum current Imin limit, respectively, and an ohmic resistance R0 of the at least one battery. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for determining an operating limit of a battery, comprising:
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sampling voltage V across at least one battery at first and second periods; sampling current I supplied by the at least one battery at said first and second periods; estimating a sum of a polarization voltage VP and an open circuit voltage V0 of the at least one battery at said second period based on said voltaae V and current I of the at least one battery at said first period; and calculating at least one of a maximum voltage limit Vmax and/or a minimum voltage limit Vmin for the at least one battery at said second period based on said sum, at least one of a maximum current limit Imax and/or a minimum current Imin limit, respectively, and an ohmic resistance R0 of the at least one battery. - View Dependent Claims (14, 15, 16, 17)
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18. A method for determining an operating limit of a battery, comprising:
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sampling voltage V across at least one battery at first and second periods; sampling current I supplied by the at least one battery at said first and second periods; estimating a sum of a polarization voltage VP and an open circuit voltage V0 of the at least one battery at said second period based on said voltaae V and current I of the at least one battery at said first period; and calculating at least one of a maximum current limit Imax and/or a minimum current Imin limit for the at least one battery at said second period based on said sum, at least one of a maximum voltage limit Vmax and/or a minimum voltage limit Vmin, respectively, and an ohmic resistance R0 of the at least one battery. - View Dependent Claims (19, 20, 21, 22)
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23. A method for determining an operating limit of a battery, comprising:
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sampling voltage V across the battery; sampling current I through the battery; estimating a sum of a polarization voltage VP and an open circuit voltage V0 of the battery based on said voltage V and current I; and determining at least one of a maximum power limit Pmax and a minimum power limit Pmin for the battery based on said sum, an ohmic resistance R0 of the battery, and at least one of a maximum voltage limit Vmax, a maximum current limit Imax, a minimum current Imin limit, and a minimum voltage limit Vmin of the battery.
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Specification