A secondary battery includes a laminate in which a positive electrode, a separator, and a negative electrode are stacked in stated order. When either or both of an affixing surface X of the positive electrode and the separator and an affixing surface Y of the negative electrode and the separator are defined as a surface Z and the length of a connecting side of a positive electrode tab connected to the positive electrode or a negative electrode tab connected to the negative electrode is defined as L, resistance A per unit area of a region P, at the surface Z, that has a rectangular shape having the connecting side and a line segment a distance 0.3L from the connecting side as one pair of opposite sides is larger than resistance B per unit area of a region Q other than the region P at the surface Z.

A secondary battery includes a laminate in which a positive electrode, a separator, and a negative electrode are stacked in stated order. When either or both of an affixing surface X of the positive electrode and the separator and an affixing surface Y of the negative electrode and the separator are defined as a surface Z and the length of a connecting side of a positive electrode tab connected to the positive electrode or a negative electrode tab connected to the negative electrode is defined as L, resistance A per unit area of a region P, at the surface Z, that has a rectangular shape having the connecting side and a line segment a distance 0.3L from the connecting side as one pair of opposite sides is larger than resistance B per unit area of a region Q other than the region P at the surface Z.

A secondary battery includes a laminate in which a positive electrode, a separator, and a negative electrode are stacked in stated order. Resistance A per unit area of a central region P that has a similar shape to a shape of a surface Z that is either or both of an affixing surface X of the positive electrode and the separator and an affixing surface Y of the negative electrode and the separator, that has a center at the same position as a center of the surface Z, and that has an area equivalent to 10% of area of the surface Z is larger than resistance B per unit area of a region Q other than the central region P at the surface Z.

A secondary battery includes a laminate in which a positive electrode, a separator, and a negative electrode are stacked in stated order. Resistance A per unit area of a central region P that has a similar shape to a shape of a surface Z that is either or both of an affixing surface X of the positive electrode and the separator and an affixing surface Y of the negative electrode and the separator, that has a center at the same position as a center of the surface Z, and that has an area equivalent to 10% of area of the surface Z is larger than resistance B per unit area of a region Q other than the central region P at the surface Z.

To provide a laminate which has a heat sealing property, a barrier property and mechanical strength, of which elution of impurities from the surface to be in contact with a chemical solution is suppressed, and of which peeling and the like hardly occur at the sealed portion of a bag and at the interfaces between the layers of the laminate when exposed to high temperature, a bag using it and a lithium ion battery. A laminate 10 comprising a first layer 12 containing a fluororesin, a second layer 14 containing a barrier material, a third layer 16 containing a fluororesin and a fourth layer 18 containing a polyamide in this order, wherein each of the fluororesin in the first layer 12 and the fluororesin in the third layer 16 is a fluororesin having a melting point of from 160 to 230° C. and having adhesive functional groups.

A battery including a stack alternating between at least one anode and at least one cathode, a primary encapsulation system covering some of the faces of the stack, at least one anode contact member operable to make electrical contact between the stack and an external conductive element, and at least one cathode contact member operable to make an electrical contact between the stack and an external conductive element. An additional encapsulation system includes two frontal regions respectively covering a respective frontal region of the primary encapsulation system and two lateral regions which cover a respective lateral region devoid of any contact member of the primary encapsulation system. Each of the two frontal regions of the additional encapsulation system further cover the frontal ends respectively of the anode contact members and the cathode contact members. The frontal regions of the additional encapsulation system form a surface continuity with the lateral regions of the additional encapsulation system.

A battery including a stack alternating between at least one anode and at least one cathode, a primary encapsulation system covering some of the faces of the stack, at least one anode contact member operable to make electrical contact between the stack and an external conductive element, and at least one cathode contact member operable to make an electrical contact between the stack and an external conductive element. An additional encapsulation system includes two frontal regions respectively covering a respective frontal region of the primary encapsulation system and two lateral regions which cover a respective lateral region devoid of any contact member of the primary encapsulation system. Each of the two frontal regions of the additional encapsulation system further cover the frontal ends respectively of the anode contact members and the cathode contact members. The frontal regions of the additional encapsulation system form a surface continuity with the lateral regions of the additional encapsulation system.

Thin-film batteries having a novel encapsulation system.

Thin-film batteries having a novel encapsulation system.

To provide a storage battery including a carbon-based material. To provide a graphene compound film having desired ion conductivity and mechanical strength while preventing direct contact between electrodes in a storage battery. To achieve long-term reliability. A lithium-ion storage battery includes a positive electrode, a negative electrode, an exterior body, and a separator between the positive electrode and the negative electrode. In the lithium-ion storage battery, one of the positive electrode and the negative electrode is wrapped in a first film, and the positive electrode, the negative electrode, and the separator are stored in the exterior body. The first film may include a first region in which the first film includes a first functional group. The first film may further include a second region in which the first film includes a second functional group different from the first functional group. The first film may be a graphene compound film.