Battery Diagnosing Apparatus and Method

A battery diagnosing apparatus for diagnosing a connection state of a battery system that includes a plurality of battery banks, the battery diagnosing apparatus comprising:

• a state measuring unit configured to measure a state of each battery bank during each of a charging process and a discharging process of the battery system;
• and
• a control unit configured to:
• select a first battery bank based on a comparison of states of the battery banks measured during the charging process of the battery system with each other,
• select a second battery bank based on a comparison of states of the battery banks measured during the discharging process of the battery system with each other, and
• determine a failure in a connection state of at least one battery bank of the plurality of battery banks based on the first and second selected battery banks being identical to each other.

A battery diagnosing method for diagnosing a connection state of a battery pack that includes a plurality of battery banks, each battery bank including a plurality of respective battery cells connected in parallel to one another, the battery diagnosing method comprising:

• measuring a state of each battery bank during each of a charging process and a discharging process of the battery pack;
• selecting, by a control unit, a first battery bank by comparing states of the battery banks measured during the charging process of the battery pack with each other;
• selecting, by the control unit, a second battery bank by comparing states of the battery banks measured during the discharging process of the battery pack with each other;
• determining, by the control unit, whether the first and second battery banks are identical to each other;
• and
• determining, by the control unit, a failure in a connection state of at least one battery bank of the plurality of battery banks based on the first and second battery banks being identical to each other.