BATTERY DIAGNOSING DEVICE AND METHOD

A battery diagnosis method according to the present disclosure includes a first generation step of generating a second profile by dividing a first profile representing a correlation between a State of Charge (SOC) and a voltage of a battery into a first portion corresponding to a first material and a second portion corresponding to a second material and removing the first portion from the first profile; a second generation step of generating a third profile by estimating a correlation between the SOC and voltage of the battery in an entire SOC range of the battery based on the second profile; and a diagnosis step of diagnosing the battery based on a calculated capacity, wherein the capacity is provided by the first material, among a total capacity provided by an electrode active material based on the third profile.