Delta voltage hybrid battery fuel gauge
AssigneeMedtronic, Inc.
InventorGang Ji
Life of this patent
Estimating the term…
Abstract
Example devices and techniques are described herein for determining a relative state-of-charge of a battery. An example device includes memory, a battery, a temperature sensor and processing circuitry coupled to the memory and the temperature sensor. The temperature sensor may be configured to sense a battery temperature. The processing circuitry may be configured to estimate an end-of-discharge state-of-charge of the battery. The processing circuitry may be configured to estimate a remaining capacity of the battery. The processing circuitry may be configured to estimate a full charge capacity of the battery. The processing circuitry may be configured to estimate a relative state-of-charge of the battery and generate a representation of the estimate of the relative state-of-charge of the battery for output.
Claims20
A device comprising:
- a memory;
- a battery;
- a temperature sensor, the temperature sensor being configured to sense a battery temperature of the battery;
- and
- processing circuitry coupled to the memory and the temperature sensor, the processing circuitry being configured to:
- estimate an end-of-discharge state-of-charge of the battery based at least in part on a scaled voltage difference between an estimated present open circuit voltage and a cutoff voltage, and an estimated end-of-discharge open circuit voltage;
- estimate a remaining capacity of the battery based at least in part on a difference between an estimated present state-of-charge and an estimated end-of-discharge state-of-charge, and a maximum battery capacity at the battery temperature;
- estimate a full charge capacity of the battery based at least in part on a difference between an end-of-charge state-of-charge and the estimated end-of-discharge state-of-charge, and the maximum battery capacity at the battery temperature;
- estimate a relative state-of-charge of the battery based at least in part on the estimated full charge capacity of the battery and the estimated remaining capacity of the battery;
- and
- generate a representation of the estimated relative state-of-charge of the battery for output.
A method comprising:
- sensing, by a temperature sensor, a battery temperature of a battery;
- estimating, by processing circuitry, an end-of-discharge state-of-charge of the battery based at least in part on a scaled voltage difference between an estimated present open circuit voltage and a cutoff voltage, and an estimated end-of-discharge open circuit voltage;
- estimating, by the processing circuitry, a remaining capacity of the battery based at least in part on a difference between an estimated present state-of-charge and an estimated end-of-discharge state-of-charge, and a maximum battery capacity at the battery temperature;
- estimating, by the processing circuitry, a full charge capacity of the battery based at least in part on a difference between an end-of-charge state-of-charge and the estimated end-of-discharge state-of-charge, and the maximum battery capacity at the battery temperature;
- estimating, by the processing circuitry, a relative state-of-charge of the battery based at least in part on the estimated full charge capacity of the battery and the estimated remaining capacity of the battery;
- and
- generating, by the processing circuitry, a representation of the estimate of the relative state-of-charge of the battery for output.
A non-transitory storage medium comprising instructions that, when executed by one or more processors of a device comprising a battery and a temperature sensor configured to sense a battery temperature of the battery, cause the one or more processors to:
- estimate an end-of-discharge state-of-charge of the battery based at least in part on a scaled voltage difference between an estimated present open circuit voltage and a cutoff voltage, and an estimated end-of-discharge open circuit voltage;
- estimate a remaining capacity of the battery based at least in part on a difference between an estimated present state-of-charge, an estimated end-of-discharge state-of-charge, and a maximum battery capacity at the battery temperature;
- estimate a full charge capacity of the battery based at least in part on a difference between an end-of-charge state-of-charge and the estimated end-of-discharge state-of-charge, and the maximum battery capacity at a battery temperature;
- estimate a relative state-of-charge of the battery based at least in part on the estimated full charge capacity of the battery and the estimated remaining capacity of the battery;
- and
- generate a representation of the estimate of the relative state-of-charge of the battery for output.
Dependencies are inferred from the claim text.