Thermal　management　system　(TMS)　plays　an　important　role　in　reducing　the　battery　module＇s　temperature　rise　and　ensuring　temperature　uniformity.　In　this　study,　a　bottom　liquid　cooling　(BLC)　TMS　based　on　multichannel　flat　tube　(MCFT)　is　established.　The　temperature　distribution　of　the　battery　module　under　the　BLC　method　is　analyzed　through　comparative　experiments　with　the　passive　cooling　method.　Then,　the　influence　of　cold　water　flow　rate　and　cold　water　inlet　temperature　variation　on　thermal　management　performance　are　studied.　Results　show　that　the　BLC　TMS　based　on　MCFT　can　effectively　reduce　the　temperature　rise　of　the　battery　module　without　considerably　reducing　the　temperature　uniformity　of　the　module.　The　increase　in　the　cold　water　flow　rate　slightly　influences　the　thermal　management　performance　of　the　battery　module,　the　change　in　the　module＇s　maximum　temperature　is　only　1.4%.　However,　the　change　in　the　cold　water　inlet　temperature　considerably　influences　the　thermal　management　performance　of　the　battery　module.　The　temperature　of　the　battery　module　can　be　maintained　below　45　degrees　C　by　decreasing　the　cold　water　inlet　temperature,　but　the　temperature　difference　of　the　battery　and　module　levels　are　increased　by　48.9%　and　61.6%,　respectively.