1results about How to "Reduce weight ratio" patented technology

The utility model relates to the technical field of lithium ion battery especially, it relates to current collector and negative pole piece. The current collector in the negative pole piece includes foil, first structural layer and second structural layer, the foil is provided with first through -hole, first structural layer is provided with second through -hole, the both ends fixed with foil of first structural layer along the thickness direction, the projection of first through -hole and second through -hole along the thickness direction coincides, first through -hole and second through -hole constitute the through -cavity for accommodating slurry, second structural layer is fixed on any one of two foils, second structural layer is fixed on the end face of corresponding foil away from first structural layer along the thickness direction, second structural layer blocks first through -hole, the foil without fixed second structural layer has first coating surface away from first structural layer along the thickness direction, the foil with fixed second structural layer has second coating surface close to second structural layer along the thickness direction, and first coating surface and second coating surface carry out coating processing in proper order.