The　performance　of　lithium-ion　battery　is　greatly　affected　by　temperature,　so　the　battery　module　must　be　equipped　with　an　effective　thermal　management　system　(TMS)　during　operation.　In　this　study,　a　new　type　of　active　air　cooling　TMS　based　on　U-shaped　micro　heat　pipe　array　(MHPA)　is　developed　to　reduce　a　battery＇s　temperature　rise　and　improve　the　temperature　uniformity　of　the　battery　module　throughout　the　entire　charge　and　discharge　process.　Modules　with　and　without　U-shaped　MHPA　are　established　for　comparative　experiments.　They　can　dissipate　heat　in　three　methods,　namely　active　air　cooling　with　U-shaped　MHPA　(AAC-MHPA),　passive　air　cooling　with　U-shaped　MHPA　(PAC-MHPA),　and　passive　air　cooling　with　no　U-shaped　MHPA　(PAC-NMHPA).　Results　show　that　under　2C　constant　current　charge　and　3C　constant　current　discharge　conditions,　the　maximum　instantaneous　highest　temperatures　of　AAC-MHPA　and　PAC-NMHPA　are　51.70　degrees　C　and　57.83　degrees　C,　respectively.　This　outcome　demonstrates　that　the　thermal　management　performance　of　AAC-MHPA　is　the　best.　This　cooling　method　has　good　thermal　management　performance　even　under　high　charge　and　discharge　rates　conditions.