Abnormality detector and detection method, and facility for producing battery

A device for detecting an abnormality of multiple batteries stored in a storing member made of fire retarding material, comprising:

• a low temperature reaction material reacting at lower temperature than the temperature that the abnormality of the batteries occurs, arranged to contact an area of each of the batteries likely to become high temperature;
• and
• a sensor for detecting the change of the material,
• wherein the area of each of the batteries likely to become high temperature is an overlapping section at which a positive electrode of each of the batteries and a negative electrode of each of the batteries are overlapped via a separator, and the low temperature reaction material is arranged facing the overlapping section,
• wherein in the storing member, partition members made of fire retarding material are inserted between each of the adjacent batteries, and the partition members and the batteries are arranged alternately with their wide faces touching,
• wherein the low temperature reaction material is arranged in the partition member, and
• wherein the sensor is configured as a smell sensor, a smoke sensor, or a combination of these sensors.