| CPC G01R 31/367 (2019.01) [G01R 31/3832 (2019.01); H01M 10/44 (2013.01); H02J 7/0048 (2020.01)] | 20 Claims |
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1. A state of charge (SOC) estimation method for mobile power supply, comprising:
step S1: calculating an electric quantity value of a fixed step size for the mobile power supply;
step S2: sampling currents charging or discharging the mobile power supply at time intervals of a current sampling period, calculating a unit electric quantity based on the sampled currents, and sequentially superimposing the unit electric quantity step by step to calculate an accumulated electric quantity of the mobile power supply from the last moment of SOC change;
step S3: comparing the absolute value of the accumulated electric quantity with the electric quantity value of the fixed step size, and performing addition and subtraction operations based on the comparison result to acquire an SOC value, at the current moment and an initial value of the accumulated electric quantity at the next moment;
step S4: after the SOC value is updated, cycling the steps S2 and S3 when the accumulated electric quantity continues to change, and maintaining the updated SOC value at the previous moment and saving the accumulated electric quantity of the current moment when the accumulated electric quantity does not change; and
controlling a display to display updated SOC values,
wherein the step S3 further comprises:
when the absolute value of the accumulated electric quantity is greater than or equal to the electric quantity value of the fixed step size, adding or subtracting the fixed step size on the basis of the SOC value at the previous moment to obtain the current SOC value according to charging or discharging states of the mobile power supply, and subtracting the electric quantity value of the fixed step size from the accumulated electric quantity or adding the electric quantity value of the fixed step size to the accumulated electric quantity to obtain the initial value of the accumulated electric quantity at the next moment according to the charging or discharging states of the mobile power supply; and
when the absolute value of the accumulated electric quantity is less than the electric quantity value of the fixed step size, keeping the SOC value at the previous moment as the current SOC value, and saving the accumulated electric quantity as the initial value of the accumulated electric quantity at the next moment.
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