A battery diagnosis apparatus, comprising: a voltage sensor configured to measure a battery voltage across a battery and generate a voltage signal indicating the measured battery voltage; a current sensor configured to measure a battery current flowing through the battery and generate a current signal indicating the measured battery current; and a control circuit configured to collect the voltage signal and the current signal at each unit time, characterized in that the control circuit is configured to: determine a measured capacity curve indicating a relationship between the battery voltage and a residual capacity over a predetermined set voltage range based on the voltage signal and the current signal collected at each unit time for a constant current period during which the battery is charged or discharged at a predetermined current rate over the set voltage range, determine a measured differential curve indicating a relationship between the battery voltage and a differential capacity over the set voltage range based on the measured capacity curve, wherein the differential capacity is a ratio of a change in the residual capacity for each unit time to a change in the battery voltage for each unit time, and determine whether a negative electrode tortuosity of the battery abnormally increased by comparing the measured differential curve with a reference differential curve, wherein the reference differential curve is given as the relationship between the battery voltage and the differential capacity over the set voltage range when the battery is in fresh condition. a voltage sensor configured to measure a battery voltage across a battery and generate a voltage signal indicating the measured battery voltage; a current sensor configured to measure a battery current flowing through the battery and generate a current signal indicating the measured battery current; and a control circuit configured to collect the voltage signal and the current signal at each unit time, characterized in that the control circuit is configured to: determine a measured capacity curve indicating a relationship between the battery voltage and a residual capacity over a predetermined set voltage range based on the voltage signal and the current signal collected at each unit time for a constant current period during which the battery is charged or discharged at a predetermined current rate over the set voltage range, determine a measured differential curve indicating a relationship between the battery voltage and a differential capacity over the set voltage range based on the measured capacity curve, wherein the differential capacity is a ratio of a change in the residual capacity for each unit time to a change in the battery voltage for each unit time, and determine whether a negative electrode tortuosity of the battery abnormally increased by comparing the measured differential curve with a reference differential curve, wherein the reference differential curve is given as the relationship between the battery voltage and the differential capacity over the set voltage range when the battery is in fresh condition. determine a measured capacity curve indicating a relationship between the battery voltage and a residual capacity over a predetermined set voltage range based on the voltage signal and the current signal collected at each unit time for a constant current period during which the battery is charged or discharged at a predetermined current rate over the set voltage range, determine a measured differential curve indicating a relationship between the battery voltage and a differential capacity over the set voltage range based on the measured capacity curve, wherein the differential capacity is a ratio of a change in the residual capacity for each unit time to a change in the battery voltage for each unit time, and determine whether a negative electrode tortuosity of the battery abnormally increased by comparing the measured differential curve with a reference differential curve, wherein the reference differential curve is given as the relationship between the battery voltage and the differential capacity over the set voltage range when the battery is in fresh condition.