DIFFUSION-LIMITED ADAPTIVE BATTERY CHARGING

摘要

Some embodiments of the present invention provide a system that adaptively charges a battery, wherein the battery is a lithium-ion battery which includes a transport-limiting electrode governed by diffusion, an electrolyte separator and a non-transport-limiting electrode. During operation, the system determines a lithium surface concentration at an interface between the transport-limiting electrode and the electrolyte separator based on a diffusion time for lithium in the transport-limiting electrode. Next, the system calculates a charging current or a charging voltage for the battery based on the determined lithium surface concentration. Finally, the system applies the charging current or the charging voltage to the battery.

主权项

1. A method for adaptively charging a battery, wherein the battery is a lithium-ion battery that includes a transport-limiting electrode governed by diffusion, an electrolyte separator and a non-transport-limiting electrode, comprising while the battery is charging:
charging the battery with a fixed current for a fixed time period; entering a zero current state in which the charging current is set to zero; during the zero current state, measuring an open circuit voltage for the battery at two times while the open circuit voltage relaxes toward a steady state; and calculating a charging current or a charging voltage based on the measured open circuit voltages; and applying the calculated charging current or the calculated charging voltage to the battery.