Method for determining state of charge and electronic device thereof
A method for determining a state of charge adapted for a battery is provided, the method including: obtaining a plurality of discharge curves; determining that the battery is in a discharge mode; measuring a current C-rate and a current voltage of the battery in the discharge mode; selecting a first discharge curve and a second discharge curve from the plurality of discharge curves, wherein a first C-rate corresponding to the first discharge curve is greater than the current C-rate, and a second C-rate corresponding to the second discharge curve is less than the current C-rate; and calculating a state of charge of the battery according to the first discharge curve and the second discharge curve.
1. An electronic device comprising:
a battery, supplying power of the electronic device;
a storage medium, storing a plurality of discharge curves and a plurality of commands; and
a controller coupled to the battery and the storage medium, the controller being configured to execute the plurality of commands, wherein the plurality of commands comprise:
determining that the battery is in a discharge mode;
measuring a current C-rate and a current voltage of the battery in the discharge mode;
selecting a first discharge curve and a second discharge curve from the plurality of discharge curves according to the current C-rate, wherein a first C-rate corresponding to the first discharge curve is greater than the current C-rate, and a second C-rate corresponding to the second discharge curve is less than the current C-rate; and
calculating a state of charge of the battery according to the first discharge curve and the second discharge curve, wherein
the plurality of discharge curves comprise a first discharge curve set having a C-rate greater than the current C-rate and a second discharge curve set having a C-rate less than the current C-rate,
among each of C-rates corresponding to the first discharge curve set, the first C-rate is closest to the current C-rate, and
among each of C-rates corresponding to the second discharge curve set, the second C-rate is closest to the current C-rate.
2. The electronic device according to claim 1 , wherein the operation of calculating the state of charge of the battery according to the first discharge curve and the second discharge curve comprises:
performing an interpolation operation on the first discharge curve and the second discharge curve to calculate the state of charge.
3. The electronic device according to claim 2 , wherein the operation of performing the interpolation operation on the first discharge curve and the second discharge curve to calculate the state of charge comprises:
obtaining a first state of charge corresponding to the current voltage from the first discharge curve;
obtaining a second state of charge corresponding to the current voltage from the second discharge curve; and
calculating the state of charge according to the current C-rate, the first C-rate, the second C-rate, the first state of charge, and the second state of charge.
4. The electronic device according to claim 1 , wherein the plurality of commands further comprise:
determining that the battery is in a resting mode;
measuring a second voltage of the battery in the resting mode; and
calculating the state of charge of the battery according to the second voltage.
5. A method for determining a state of charge adapted for a battery, the method comprising:
obtaining a plurality of discharge curves;
determining that the battery is in a discharge mode;
measuring a current C-rate and a current voltage of the battery in the discharge mode;
selecting a first discharge curve and a second discharge curve from the plurality of discharge curves according to the current C-rate, wherein a first C-rate corresponding to the first discharge curve is greater than the current C-rate, and a second C-rate corresponding to the second discharge curve is less than the current C-rate; and
calculating a state of charge of the battery according to the first discharge curve and the second discharge curve, wherein
the plurality of discharge curves comprise a first discharge curve set having a C-rate greater than the current C-rate and a second discharge curve set having a C-rate less than the current C-rate,
among each of C-rates corresponding to the first discharge curve set, the first C-rate is closest to the current C-rate, and
among each of C-rates corresponding to the second discharge curve set, the second C-rate is closest to the current C-rate.
6. The method according to claim 5 , wherein the step of calculating the state of charge of the battery according to the first discharge curve and the second discharge curve comprises:
performing an interpolation operation on the first discharge curve and the second discharge curve to calculate the state of charge.
7. The method according to claim 6 , wherein the step of performing the interpolation operation on the first discharge curve and the second discharge curve to calculate the state of charge comprises:
obtaining a first state of charge corresponding to the current voltage from the first discharge curve;
obtaining a second state of charge corresponding to the current voltage from the second discharge curve; and
calculating the state of charge according to the current C-rate, the first C-rate, the second C-rate, the first state of charge, and the second state of charge.
8. The method according to claim 5 , further comprising:
determining that the battery is in a resting mode;
measuring a second voltage of the battery in the resting mode; and
calculating the state of charge of the battery according to the second voltage.