METHOD FOR CONTROLLING AN ELECTROLYTE FILLING UNIT

An electrolyte filling unit and method for controlling the filling of electrolyte in a battery cell structure comprising a battery casing and an electrode assembly arranged within the battery casing. The electrolyte filling unit comprises a pressure chamber, a filling arrangement arranged in the pressure chamber, and a pressure storage tank for holding a volume of electrolyte. The filling arrangement is fluidly connected to the pressure storage tank via a dosing arrangement. A tank pressure level in the pressure storage tank relative to the pressure level in the pressure chamber is controlled, such that the tank pressure level constantly is higher than the pressure level in the pressure chamber during filling of electrolyte from the pressure storage tank via the dosing arrangement and the filling arrangement into the battery casing.