Thermal　runaway　is　a　major　safety　issue　for　lithium-ion　battery　packs　during　manufacturing,　storage,　and　service.　Designing　a　more　efficient　thermal　structure　to　prevent　the　propagation　of　thermal　runaway　is　crucial　for　ensuring　the　safety　and　performance　of　the　lithium-ion　battery　packs.　In　this　work,　a　novel　thermal-cloak-based　thermal　design　with　the　phase　change　material　for　preventing　thermal　runaway　propagation　in　lithium-ion　battery　packs　is　proposed.　In　this　new　design　inspired　by　thermal　cloak,　a　single　battery　is　wrapped　with　two　layers　of　materials.　The　inner　layer　in　contact　with　the　battery　surface　uses　phase　change　materials　(paraffin　or　hydrogel　materials)　to　control　the　operating　temperature　range　of　the　battery,　and　the　outer　layer　employs　materials　with　high　thermal　conductivity　(aluminum　or　copper)　to　efficiently　dissipate　heat　and　prevent　local　high　temperatures.　The　results　show　that　the　maximum　temperature　of　the　battery　with　paraffin　and　hydrogel　materials　is　99.92　degrees　C　and　92.7　degrees　C,　respectively,　when　only　phase　change　materials　are　used.　After　adopting　the　thermal-cloak-based　thermal　design,　the　maximum　temperature　of　the　battery　decreases　to　57.25　degrees　C,　demonstrating　the　advantage　of　the　new　design　for　preventing　thermal　runaway　propagation.　Moreover,　the　effectiveness　of　this　thermal　design　in　preventing　thermal　runaway　propagation　has　been　validated　through　numerical　simulations　and　experimental　testing.　In　addition,　the　new　thermal　design　improves　temperature　uniformity　in　the　battery　packs.　The　thermal　design　proposed　here　can　avoid　thermal　accumulation　and　high　temperature　gradients,　which　may　help　improve　the　safety　of　lithium-ion　battery　storage,　transportation,　and　operation.　The　research　findings　of　this　work　provide　a　fundamental　understanding　of　preventing　thermal　runaway　propagation　and　may　improve　the　performance　and　safety　of　energy　conversion　and　storage　systems　based　on　lithium-ion　battery　packs.