In　the　practical　application　of　magnetic　coupling　wireless　charging　technology,　the　absence　of　direct　contact　between　the　receiver　and　transmitter　usually　leads　to　metal　objects　(MOs)　entering　the　charging　area.　The　strong　magnetic　field　between　the　receiver　and　transmitter　causes　eddy　current　effects　and　generates　large　amounts　of　heat　in　MOs,　which　may　lead　to　serious　hazards　such　as　fires,　so　it　is　necessary　to　detect　accidental　entry　of　MOs.　In　this　paper,　a　novel　detection　coil　layout　suitable　for　wireless　charging　of　electric　vehicles　(EVs)　has　been　proposed,　which　consists　of　multiple　quadrupole　coils　arranged　to　achieve　decoupling　from　the　receiver　and　the　transmitter　to　minimize　the　effect　on　the　system　efficiency.　The　influence　of　the　presence　of　MOs　on　the　equivalent　inductance　and　equivalent　resistance　of　the　quadrupole　detection　coil　has　been　deduced.　The　simulation　results　show　that　the　maximum　self-inductance　change　rate　of　the　proposed　detection　coil　reaches　28.11%,　and　a　high　self-inductance　variation　rate　is　also　achieved　at　the　edge　of　the　detection　coil.　©　2023　The　Author(s)