Battery abnormality detection system, battery abnormality detection method, and battery abnormality detection program

A battery abnormality detection method comprising:

• acquiring voltage of each of a plurality of cells or a plurality of parallel cell blocks in a battery pack and temperatures at a plurality of observation points respectively measured by a plurality of temperature sensors provided in the battery pack;
• and
• determining whether a specific cell or a specific parallel cell block is an abnormality, based on a transition of a voltage of the specific cell or the specific parallel cell block in a predetermined period in the battery pack and on a difference between a temperature change at a first observation point and a temperature change at a second observation point in the predetermined period in the battery pack, wherein
• the determining comprises determining whether an internal short-circuit is in the specific cell or the specific parallel cell block by estimating an internal short-circuit resistance value of the specific cell or the specific parallel cell block based on an integrated value of squares of voltages of the specific cell or the specific parallel cell block in the predetermined period in the battery pack and on a calorific value corresponding to a difference between a rise temperature at a first observation point and a rise temperature at a second observation point in the predetermined period in the battery pack.

A non-transitory storage medium storing thereon a program designed to cause one or more processors to perform operations comprising:

• acquiring voltage of each of a plurality of cells or a plurality of parallel cell blocks in a battery pack and temperatures at a plurality of observation points respectively measured by a plurality of temperature sensors provided in the battery pack;
• and
• determining whether a specific cell or a specific parallel cell block is an abnormality, based on a transition of a voltage of the specific cell or the specific parallel cell block in a predetermined period in the battery pack and on a difference between a temperature change at a first observation point and a temperature change at a second observation point in the predetermined period in the battery pack, wherein
• the determining comprises determining whether an internal short-circuit is in the specific cell or the specific parallel cell block by estimating an internal short-circuit resistance value of the specific cell or the specific parallel cell block based on an integrated value of squares of voltages of the specific cell or the specific parallel cell block in the predetermined period in the battery pack and on a calorific value corresponding to a difference between a rise temperature at a first observation point and a rise temperature at a second observation point in the predetermined period in the battery pack.