Battery pack diagnosis apparatus

A battery pack diagnosing apparatus for diagnosing a battery pack in which a charging and discharging path connects a battery cell to a pack terminal, wherein each of a (i) charging and discharging switch and (ii) a fuse is positioned on the charging and discharging path in series between the battery cell and the pack terminal, wherein the charging and discharging switch is positioned between the battery cell and the fuse, and wherein the fuse is positioned between the charging and discharging switch and the pack terminal, the battery pack diagnosing apparatus comprising:

• a first diagnosing path having a first end connected to a first node positioned on the charging and discharging path between the battery cell and the charging and discharging switch and a second end connected to a common node on a path toward ground;
• a first resistor positioned on the first diagnosing path between the first node and the common node;
• a second diagnosing path having a first end connected to a second node positioned on the charging and discharging path between the charging and discharging switch and the fuse and a second end connected to the common node;
• a second resistor positioned on the second diagnosing path between the second node and the common node;
• a third diagnosing path having a first end connected to a third node positioned on the charging and discharging path between the charging and discharging switch and the pack terminal and a second end connected to the common node;
• a third resistor positioned on the third diagnosing path between the third node and the common node;
• an integrated diagnosing path having a first end connected to the common node and a second end connected to ground;
• a diagnosis switching unit and a diagnosis resistor positioned on the integrated diagnosing path in series between the first common node and ground;
• a voltage measuring unit configured to measure a diagnosis voltage at a diagnosis node on the integrated diagnosis path between the diagnosis switching unit and the diagnosis resistor;
• and
• a control unit configured to turn on and off the diagnosis switching unit and determine whether the charging and discharging switch is operating abnormally based on the diagnosis voltage measured by the voltage measuring unit.