Method for diagnosing battery pack

A battery pack diagnosis method comprising:

• a battery pack manufacturing process of manufacturing a battery pack by bonding-connecting a battery cell and a wire;
• a battery cell charging and discharging process of charging and discharging the battery cell through the wire;
• a battery pack thermal image photographing process of photographing a thermal image of the battery pack;
• a thermal image reading process of reading a bonding state of a bonded portion of the battery cell and the wire from photographed thermal image data of the thermal image;
• a battery pack magnetic field image photographing process of photographing a magnetic field image of the battery pack;
• a magnetic field image reading process of reading the bonding state of the bonded portion of the battery cell and the wire from photographed magnetic field image data of the magnetic field image;
• and
• a wire bonding state defect determining process of finally determining the bonding state of the battery cell and the wire by combining thermal image reading result information obtained in the thermal image reading process and magnetic field image reading result information obtained in the magnetic field image reading process.