Method for fast charging lithium-ion batteries
First Claim
1. A method for charging a battery, the method comprising:
- measuring a battery voltage of the battery with a voltage sensor and a battery current of the battery with a current sensor;
applying, with a charging circuit, a first charging current to the battery until the measured battery voltage exceeds a predetermined voltage threshold, a magnitude of the first charging current being held at a first constant value;
applying, with the charging circuit, in response to the measured battery voltage exceeding the predetermined voltage threshold, a second charging current to the battery until a cutoff criterion is satisfied, a magnitude of the second charging current being such that the measured battery voltage exceeds a steady state voltage limit for the battery;
after the cutoff criterion is satisfied, determining a rest voltage of the battery; and
updating the cutoff criterion based on a difference between the determined rest voltage of the battery and a target rest voltage of the battery.
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Abstract
A method for charging a battery comprises: measuring a battery voltage with a voltage sensor and a battery current with a current sensor; applying, with a charging circuit, a first charging current to the battery until the measured battery voltage exceeds a predetermined voltage threshold, a magnitude of the first charging current being held at a first constant value; applying, with the charging circuit, in response to the measured battery voltage exceeding the predetermined voltage threshold, a second charging current to the battery until a cutoff criterion is satisfied, a magnitude of the second charging current being such that the battery voltage exceeds a steady state voltage limit for the battery; after the cutoff criterion is satisfied, determining a rest voltage of the battery; and updating the cutoff criterion based on a difference between the determined rest voltage and a target rest voltage.
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Citations
20 Claims
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1. A method for charging a battery, the method comprising:
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measuring a battery voltage of the battery with a voltage sensor and a battery current of the battery with a current sensor; applying, with a charging circuit, a first charging current to the battery until the measured battery voltage exceeds a predetermined voltage threshold, a magnitude of the first charging current being held at a first constant value; applying, with the charging circuit, in response to the measured battery voltage exceeding the predetermined voltage threshold, a second charging current to the battery until a cutoff criterion is satisfied, a magnitude of the second charging current being such that the measured battery voltage exceeds a steady state voltage limit for the battery; after the cutoff criterion is satisfied, determining a rest voltage of the battery; and updating the cutoff criterion based on a difference between the determined rest voltage of the battery and a target rest voltage of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A charging system for charging a battery, the charging system comprising:
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a charging circuit configured to connect to a power source and to the battery, the charging circuit configured to draw current from the power source to apply charging currents to the battery; a voltage sensor configured to measure a battery voltage of the battery; a current sensor configured to measure a battery current of the battery; and a charge controller operably connected to the charging circuit, the voltage sensor, and the current sensor, the charge controller configured to; operate the voltage sensor to measure a battery voltage of the battery and operate the current sensor to measure a battery current of the battery; operate the charging circuit to apply a first charging current to the battery until the measured battery voltage exceeds a predetermined voltage threshold, a magnitude of the first charging current being held at a first constant value; and operate the charging circuit to apply, in response to the measured battery voltage exceeding the predetermined voltage threshold, a second charging current to the battery until a cutoff criterion is satisfied, a magnitude of the second charging current being such that the measured battery voltage exceeds a steady state voltage limit for the battery, wherein at least one of the charge controller and a battery controller of the battery is configured to; after the cutoff criterion is satisfied, determine a rest voltage of the battery; and update the cutoff criterion based on a difference between the determined rest voltage of the battery and a target rest voltage of the battery. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification