BATTERY SYSTEM WITH IMPROVED COOLING CIRCUIT

Battery system (100), comprising: a plurality of battery cells (12) arranged to form one or more battery packs (14), a cooling circuit (20) including cooling channels (22) for cooling the battery cells (12) via cooling fluid flowing along the cooling channels (22) in a flow direction (F), wherein the cooling channels (22) include cooling channel segments (24), each of the cooling channel segments (24) extending alongside and being thermally conductively connected to one of the battery cells (12), the cooling channel segments (24) each comprising an upstream end (26) where the cooling fluid enters into the cooling channel segment (24) and a downstream end (27) where the cooling fluid leaves the cooling channel segment (24), wherein the cooling channel segments (24) are lined, at an inner wall (28, 29) thereof, with a phase-change material, PCM, (30) which is adapted to melt and detach from the inner wall (28, 29) when the battery cell (12) to which the cooling channel segment (24) is thermally conductively connected to overheats, the PCM (30) being further adapted to be carried along the flow direction (F) by the cooling fluid and to solidify and accumulate at the downstream end (27) of the cooling channel segment (24) thereby blocking the cooling fluid from leaving the cooling channel segment (24).