The　battery　thermal　management　system　(BTMS)　is　important　to　ensure　the　lithium-ion　battery　life,　performance,　and　safety.　A　novel　inclined　U-shaped　flat　microheat　pipe　array　(FMHPA)　is　used　for　BTMS　to　achieve　high　efficiency　and　space-saving　in　this　study.　The　thermal　control　performance　is　experimentally　studied　and　compared　with　the　module　without　FMHPAs.　Results　show　that　the　equivalent　thermal　conductivity　of　the　inclined　U-shaped　FMHPA　is　approximately　4350　W　m(-1)　K-1,　and　plays　the　role　of　core　heat　transfer　element.　The　maximum　temperature　and　temperature　difference　of　the　module　with　FMHPAs　are　reduced　by　16%　and　60%,　respectively,　compared　with　those　of　the　module　without　FMHPAs;　FMHPAs　keep　the　module　in　a　suitable　temperature　range　for　most　of　the　time　in　the　ambient　temperature　of　25　degrees　C　during　the　1C　charge-2C　discharge　cycle.　Moreover,　the　temperature　difference　at　cell　and　module　level　are　maintained　within　5　degrees　C　in　ambient　temperature　of　25　degrees　C　and　40　degrees　C.　The　heating　rate　of　the　module　with　FMHPAs　reaches　0.61　degrees　C/min　under　the　temperature　difference　of　less　than　5　degrees　C;　variable　power　heating　(from　large　to　small)　will　increase　the　temperature　rise　rate　of　the　battery　by　0.19　degrees　C/min.　(C)　2021　Published　by　Elsevier　Ltd.