Secondary battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorEmi Tsutsui
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Abstract
A secondary battery includes an electrode body and an electrolytic solution, the electrode body including a positive electrode, a negative electrode, and a separator. The separator includes a resin substrate that has a multi-layer structure including a porous polyethylene layer and a porous high melting point resin layer, the porous polyethylene layer including a polyethylene resin and being disposed to face the negative electrode, and the porous high melting point resin layer including a resin having a higher melting point than the polyethylene resin. The porosity of the porous polyethylene layer is 2% to 5%. A ratio of the thickness of the porous polyethylene layer to the total thickness of the resin substrate is 0.048 to 0.091.
Claims9
A secondary battery comprising:
- an electrode body including
- a positive electrode,
- a negative electrode, and
- a separator interposed between the positive electrode and the negative electrode;
- and
- an electrolytic solution,
- wherein the separator includes a resin substrate that has a multi-layer structure including a porous polyethylene layer and a porous resin layer, the porous polyethylene layer including a polyethylene resin and being disposed adjacent to the negative electrode, and the porous resin layer including a resin having a higher melting point than the polyethylene resin,
- wherein a porosity of the porous polyethylene layer is 2% to 5%, and
- wherein a ratio of a thickness of the porous polyethylene layer to a total thickness of the resin substrate is 0.048 to 0.091.
Dependencies are inferred from the claim text.