Battery Temperature Control Apparatus, Battery System, Energy Storage System and Battery Temperature Control Method

Provided are a battery temperature control apparatus, a battery temperature control method and a battery system. The battery temperature control apparatus includes first to ncooling fans provided in a one-to-one relationship to first to nbattery modules connected in series, first to nslave management units provided to the first to nbattery modules in a one-to-one relationship, and a master management unit. n is a natural number of 2 or greater. The master management unit determines battery temperature information including first to ntemperature values and a first reference value. The first to ntemperature values indicate temperatures of the first to nbattery modules. The first reference value is an average or a median of the first to ntemperature values. The master management unit controls a rotation speed of each cooling fan based on the battery temperature information.