| abstract |
A battery pack includes a pack case having a lid joined to an open end via a fluid impermeable seal. The battery pack also includes a battery module disposed within the battery pack housing and including a plurality of electrochemical cells. Additionally, the battery pack includes a pressure compensating device within the battery pack housing, the pressure compensating device including a first bladder fluidly coupled to a second bladder through a primary fitting. The battery pack case is filled with a dielectric fluid. Additionally, the pressure compensation device includes a second fluid. |