Battery charger
First Claim
Patent Images
1. A battery charger comprising:
- a memory storing battery parameters, including a battery time constant and a present state of charge; and
a charger controller coupled to the memory, and configured to;
determine a transitional state of charge based on a difference between the predetermined current and a taper current, the full charge capacity, the battery time constant, and the present state of charge;
determine a total charge time based on the battery time constant, the present state of charge, and the transitional state of charge;
determine a charging start time based on the total charge time;
maintain the battery at the present state of charge below a full charge capacity of the battery before the charging start time;
supply a predetermined current to charge the battery after the charging start time and before the battery reaches the transitional state of charge; and
supply a predetermined voltage to charge the battery after the battery reaches the transitional state of charge.
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Abstract
A battery charger can include a charger controller configured to determine a total charge time that characterizes a time needed to charge a battery, the total charge time being based on a received state of charge (SOC) of the battery that characterizes a present SOC of the battery. The charger controller can also be configured to determine a charging start time for the battery based on a predetermined full charge time and the total charge time.
26 Citations
15 Claims
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1. A battery charger comprising:
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a memory storing battery parameters, including a battery time constant and a present state of charge; and a charger controller coupled to the memory, and configured to; determine a transitional state of charge based on a difference between the predetermined current and a taper current, the full charge capacity, the battery time constant, and the present state of charge; determine a total charge time based on the battery time constant, the present state of charge, and the transitional state of charge; determine a charging start time based on the total charge time; maintain the battery at the present state of charge below a full charge capacity of the battery before the charging start time; supply a predetermined current to charge the battery after the charging start time and before the battery reaches the transitional state of charge; and supply a predetermined voltage to charge the battery after the battery reaches the transitional state of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-transitory machine readable medium having instructions, which upon being implemented by a processor, cause the processor to:
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determine a transitional state of charge of a battery based on a difference between the predetermined current and a taper current, the full charge capacity, the battery time constant, and the present state of charge; determine a total charge time based on the battery time constant, the present state of charge, and the transitional state of charge; determine a charging start time based on the total charge time; maintain the battery at the present state of charge below a full charge capacity of the battery before the charging start time; supply a constant current to charge the battery after the charging start time and before the battery reaches the transitional state of charge; and supply a constant voltage to charge the battery after the battery reaches the transitional state of charge. - View Dependent Claims (10, 11, 12)
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13. A battery charging system comprising:
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a battery pack including a battery; a battery gauge configured to determine a present state of charge of the battery; and a battery charger configured to provide a charging signal to the battery pack, the battery charger comprising a charger controller configured to; determine a transitional state of charge based on a difference between the predetermined current and a taper current, the full charge capacity, the battery time constant, and the present state of charge; determine a total charge time based on the battery time constant, the present state of charge, and the transitional state of charge; determine a charging start time based on the total charge time; maintain the battery at the present state of charge below a full charge capacity of the battery before the charging start time; supply a constant current to charge the battery after the charging start time and before the battery reaches the transitional state of charge; and supply a constant voltage to charge the battery after the battery reaches the transitional state of charge. - View Dependent Claims (14, 15)
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Specification