Battery pack

A battery pack comprises a battery module and a battery management system for controlling charging and discharging of the battery module via an external terminal, wherein the battery management system is arranged to limit a state of charge of the battery module to be within a charging and discharging range between a charging limit and a discharging limit, the battery pack further comprising a sensor unit for detecting swelling in the battery module, wherein the battery management system is arranged to limit the state of charge of the battery module in response to the detection of swelling in the battery module.