Method for determining a maximum charge current and a maximum discharge current of a battery
First Claim
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1. A method for determining a maximum charge current of a battery, comprising:
- determining a steady-state charge resistance based on a current state of charge of the battery;
determining a no-load charge voltage based on the current state of charge of the battery;
calculating a maximum temporary charge current; and
calculating a maximum charge current based on the maximum temporary charge current.
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Abstract
A method for determining a maximum charge current of a battery is provided which comprises: determining a steady-state charge resistance based on a current state of charge of the battery; determining a no-load charge voltage based on the current state of charge of the battery; calculating a maximum temporary charge current; and calculating a maximum charge current based on the maximum temporary charge current.
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Citations
9 Claims
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1. A method for determining a maximum charge current of a battery, comprising:
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determining a steady-state charge resistance based on a current state of charge of the battery;
determining a no-load charge voltage based on the current state of charge of the battery;
calculating a maximum temporary charge current; and
calculating a maximum charge current based on the maximum temporary charge current. - View Dependent Claims (2, 3)
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4. A method for determining a maximum discharge current of a battery, comprising:
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determining a steady-state discharge resistance based on a current state of charge of the battery;
determining a no-load discharge voltage based on the current state of charge of the battery;
calculating a maximum temporary discharge current; and
calculating a maximum discharge current based on the maximum temporary discharge current. - View Dependent Claims (5, 6)
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7. A battery management system for managing a battery of a hybrid electric vehicle, the battery management system determining a maximum charge current of the battery, the battery management system comprising:
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a processor for controlling charging of the battery;
memory for storing instructions for execution by the processor;
a first module stored in the memory, the first module comprising;
logic for determining a steady-state charge resistance based on a current state of charge of the battery;
logic for determining a no-load charge voltage based on the current state of charge of the battery;
logic for calculating a maximum temporary charge current; and
logic for calculating a maximum charge current based on the maximum temporary charge current.
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8. A battery management system for managing a battery of a hybrid electric vehicle, the battery management system determining a maximum discharge current of the battery, the battery management system comprising:
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a processor for controlling discharging of the battery;
memory for storing instructions for execution by the processor;
a first module stored in the memory, the first module comprising;
logic for determining a steady-state discharge resistance based on a current state of charge of the battery;
logic for determining a no-load discharge voltage based on the current state of charge of the battery;
logic for calculating a maximum temporary discharge current; and
logic for calculating a maximum discharge current based on the maximum temporary discharge current.
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9. A method of more accurately determining maximum charging and discharging currents for a battery of a hybrid electric vehicle, the method comprising:
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determining a plurality of maximum voltage differentials corresponding to a plurality of possible state of charges for the battery, each maximum voltage differential based on a difference between a predetermined voltage limit for the battery and a no-load voltage value for each of the plurality of possible state of charges;
determining a plurality of steady-state resistances corresponding to the plurality of possible state of charges;
measuring a first state of charge of the battery;
determining one of a maximum charge current and a maximum discharge current by dividing the maximum voltage differential corresponding to the first state of charge by the steady-state resistance corresponding to the first state of charge.
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Specification