Systems and methods for determining battery state of charge
First Claim
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1. A device comprising:
- a power source configured to provide a charging current to a battery;
a memory storing a first impedance directly associated with a first state of charge (SOC) of a battery, the first SOC corresponding to a charging state of the battery after receiving the charging current; and
a controller coupled to the memory, and configured to;
determine a second impedance of the battery during a discharge state of the battery;
determine whether the second impedance directly corresponds to the first impedance; and
determine a second SOC of the battery during the discharge state based on the first SOC of the battery when the second impedance directly corresponds to the first impedance.
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Abstract
Systems (50, 200) and methods for determining a state of charge of a battery (52, 102, 150, 202) are provided. The system (50, 200) includes a power source (56, 206) configured to provide a charging current to a battery (52, 102, 150, 202). A controller (54, 104, 204) is included and configured to determine a state of charge of the battery (52, 102, 150, 202) based on impedance of a battery (52, 102, 150, 202) during a discharge time period based on an impedance and a state of charge relationship of a battery (52, 102, 150, 202) during a charge time period.
19 Citations
12 Claims
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1. A device comprising:
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a power source configured to provide a charging current to a battery; a memory storing a first impedance directly associated with a first state of charge (SOC) of a battery, the first SOC corresponding to a charging state of the battery after receiving the charging current; and a controller coupled to the memory, and configured to; determine a second impedance of the battery during a discharge state of the battery; determine whether the second impedance directly corresponds to the first impedance; and determine a second SOC of the battery during the discharge state based on the first SOC of the battery when the second impedance directly corresponds to the first impedance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device comprising:
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a power source configured to provide the battery with a charging current; and a memory storing an initial state of charge (SOC) of a battery before the battery receiving the charging current; and a controller coupled to the memory, and configured to; determine a change of SOC from the initial SOC based on the charging current, a charging time, and a full capacity charge (FCC) parameter of the battery; determine a charging SOC by adding the change of SOC to the initial SOC; associated the charging SOC to an open circuit voltage of the battery; and determine a charging impedance of the battery based on the charging current and a difference between a measured voltage of the battery during the charging state and the open circuit voltage. - View Dependent Claims (8, 9)
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10. A method for determining a state of charge of a battery, the method comprising:
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providing a charging current to the battery; determining an initial state of charge (SOC) of the battery; charging the battery with the charging current for a predetermined time interval; determining a first SOC of the battery based on the initial SOC, the charging current, and the predetermined time interval; determining a first impedance for the battery based on and corresponding to the first SOC of the battery; discharging the battery during a discharge time period; determining a second impedance of the battery during the discharge time period; determine whether the second impedance directly corresponds to the first impedance; and determining a second SOC of the battery based on the first SOC of the battery when the second impedance directly corresponds to the first impedance. - View Dependent Claims (11, 12)
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Specification