A lithium ion secondary battery comprising: an electrode assembly in which a plurality of pocketing anode bodies and a plurality of cathode bodies are alternately stacked, wherein a concavely recessed space is formed in the electrode assembly and a protrusion of an electronic apparatus is insertable into the space, characterized in that the pocketing anode body includes: an anode plate which has a coating layer of lithium or lithium metal complex oxide as an anode active material and a plain protrusion and has a first through hole formed therethrough; one pair of separation films which covers both surfaces of the anode plate while exposing only the plain protrusion; and a film unit which is located between the pair of separation films in the entire or partial circumference of the anode plate to be attached to the pair of separation films, wherein the film unit includes: a first insulating member which is located between the pair of separation films in the entire or partial outer circumference of the anode plate to be attached to the pair of separation films; and a second insulating member which is located between the pair of separation films in the entire or partial inner circumference of the anode plate which forms the first through hole to be attached to the pair of separation films, wherein the film unit includes a connecting member which connects the first insulating member and the second insulating member to each other. an electrode assembly in which a plurality of pocketing anode bodies and a plurality of cathode bodies are alternately stacked, wherein a concavely recessed space is formed in the electrode assembly and a protrusion of an electronic apparatus is insertable into the space, an anode plate which has a coating layer of lithium or lithium metal complex oxide as an anode active material and a plain protrusion and has a first through hole formed therethrough; one pair of separation films which covers both surfaces of the anode plate while exposing only the plain protrusion; and a film unit which is located between the pair of separation films in the entire or partial circumference of the anode plate to be attached to the pair of separation films, wherein the film unit includes: a first insulating member which is located between the pair of separation films in the entire or partial outer circumference of the anode plate to be attached to the pair of separation films; and a second insulating member which is located between the pair of separation films in the entire or partial inner circumference of the anode plate which forms the first through hole to be attached to the pair of separation films, wherein the film unit includes a connecting member which connects the first insulating member and the second insulating member to each other. a first insulating member which is located between the pair of separation films in the entire or partial outer circumference of the anode plate to be attached to the pair of separation films; and a second insulating member which is located between the pair of separation films in the entire or partial inner circumference of the anode plate which forms the first through hole to be attached to the pair of separation films, wherein the film unit includes a connecting member which connects the first insulating member and the second insulating member to each other.