Optimized bi-directional balancing method and system

摘要

A battery balancing method and system which includes a plurality of cells connected in series, a balancer for each cell, a monitor configured to determine a state of charge (SOC) of each cell, and a microprocessor. The microprocessor iteratively calculates a SOC error for each cell, based on a theoretical balancing of the Min Q cell and the Max Q cell, until the SOC error is less than or equal to a first threshold; and iteratively re-calculates SOC error based on a net charge or discharge time for each balancer until the SOC error is less than or equal to a second threshold; and when the SOC error is less than or equal to the second threshold, instructs each balancer to physically balance each respective cell based on the respective calculated net charge or discharge time when the second threshold is met.

主权项

1. A battery balancing system comprising:
a plurality of cells connected in series, wherein the plurality of cells includes a Min Q cell and a Max Q cell; a balancer for each cell; a monitor configured to determine a state of charge (SOC) of each cell; a microprocessor configured to:
iteratively calculate a SOC error for each cell, based on a theoretical balancing of the Min Q cell and the Max Q cell, until the SOC error for each cell is less than or equal to a predetermined first threshold;while the SOC error is less than or equal to a predetermined first threshold, iteratively re-calculate the SOC error for each cell using a calculated net charge or discharge time for each balancer until the SOC error for each cell is less than or equal to a predetermined second threshold; andwhen the SOC error is less than or equal to a predetermined second threshold, instruct each balancer to physically balance each respective cell based on the respective calculated net charge or discharge time by adding or removing charge to or from each respective cell.