To　promote　energy　conservation　and　emission　reduction,　the　electric　vehicles　(EVs)　are　developing　rapidly.　An　effective　battery　thermal　management　system　(BTMS)　can　extend　the　service　life　of　batteries　and　avoid　thermal　runaway.　In　this　study,　a　liquid-cooling　management　system　of　a　Li-ion　battery　(LIB)　pack　(Ni-Co-Mn,　NCM)　is　established　by　CFD　simulation.　The　effects　of　liquid-cooling　plate　connections,　coolant　inlet　temperature,　and　ambient　temperature　on　thermal　performance　of　battery　pack　are　studied　under　different　layouts　of　the　liquidcooling　plate.　Then,　A　new　heat　dissipation　scheme,　variable　temperature　cooling　of　the　inlet　coolant,　is　proposed.　Results　indicate　that　connecting　two　sets　of　liquid　coolant　plates　in　a　3-series,　1-parallel　configuration　can　effectively　reduce　the　maximum　temperature　of　the　battery　pack　from　48.73　degrees　C　to　30.75　degrees　C,　while　controlling　the　maximum　temperature　difference　to　3.98　degrees　C　at　the　end　of　discharge.　Simultaneously,　the　proposed　cooling　scheme　reduces　the　maximum　temperature　difference　within　the　battery　pack　by　36.09　%　at　the　beginning　of　the　discharge　period.　This　study　provides　a　valuable　reference　into　advancing　BTMSs　of　battery　pack-level　for　EVs.