Charging method and charging system

Abstract

A charging method includes: determining, for charging current of a lithium ion battery, first and a second threshold values each representing a current boundary value at which precipitation of lithium metal becomes likely to occur on an electrode of the lithium ion battery; and controlling the charging current of the lithium ion battery using a difference between the first and second threshold values, and the second threshold value. The first threshold value represents a current boundary value at which precipitation of the lithium metal becomes likely to occur when the charging current of the lithium ion battery exceeds the first threshold value. The second threshold value is 10 smaller than the first threshold value, and represents a current boundary value at which precipitation of the lithium metal becomes likely to occur when the charging current of the lithium ion battery continuously exceeds the second threshold value.

Dependencies are inferred from the claim text.