NOVELTY - A lithium ion secondary battery (1) comprises a power-generating element (10) including a positive electrode plate (11); a battery case (40) that accommodates the power-generating element; and an electrolytic solution that is accommodated in the battery case and includes lithium ions.    USE - The lithium ion secondary battery is useful for producing vehicle and battery-carrying device (all claimed).    ADVANTAGE - The invention provides lithium ion secondary battery where the increase in the resistance value of the lithium ion secondary battery that follows the lithium ions in the electrolytic solution can be inhibited.    DETAILED DESCRIPTION - A lithium ion secondary battery (1) comprises a power-generating element (10) including a positive electrode plate (11) including a positive electrode foil and a positive electrode active material layer supported on the positive electrode foil; a negative electrode plate (21) including a negative electrode foil and a negative electrode active material layer supported on the negative electrode foil; and a separator (30) inserted between the positive electrode active material layer of the positive electrode plate and the negative electrode active material layer of the negative electrode plate, where a positive electrode exposed portion, which is a part of the positive electrode foil and does not support the positive electrode active material layer, protrudes from an end edge of the separator on the positive electrode side toward the outside of the lithium ion secondary battery, and a negative electrode exposed portion, which is a part of the negative electrode foil and does not support the negative electrode active material layer, protrudes from an end edge of the separator on the negative electrode side toward the outside of the lithium ion secondary battery; a battery case (40) that accommodates the power-generating element; and an electrolytic solution that is accommodated in the battery case and includes lithium ions, where the electrolytic solution includes a first electrolytic solution and a second electrolytic solution; the first electrolytic solution is disposed between the positive electrode active material layer and the negative electrode active material layer; the second electrolytic solution is disposed in contact with at least either of the positive electrode exposed portion and the negative electrode exposed portion in a state in which the second electrolytic solution fluidly communicates with the first electrolytic solution; and the second electrolytic solution has a lithium ion concentration higher than that of the first electrolytic solution prior to the use of the lithium ion secondary battery. INDEPENDENT CLAIMS are:    (1) a vehicle that carries the lithium ion secondary battery;    (2) a battery-carrying device that carries the lithium ion secondary battery; and    (3) a method for manufacturing a lithium ion secondary battery, where the lithium ion secondary battery includes a power-generating element including a positive electrode plate including a positive electrode foil and a positive electrode active material layer supported on the positive electrode foil; a negative electrode plate including a negative electrode foil and a negative electrode active material layer supported on the negative electrode foil; and a separator inserted between the positive electrode active material layer of the positive electrode plate and the negative electrode active material layer of the negative electrode plate, where a positive electrode exposed portion, which is a part of the positive electrode foil and does not support the positive electrode active material layer, protrudes from an end edge of the separator on the positive electrode side toward the outside of the lithium ion secondary battery, and a negative electrode exposed portion, which is a part of the negative electrode foil and does not support the negative electrode active material layer, protrudes from an end edge of the separator on the negative electrode side toward the outside of the lithium ion secondary battery; a battery case that accommodates the power-generating element; and an electrolytic solution that is accommodated in the battery case and includes lithium ions, where the manufacturing method comprises impregnating the separator with a first electrolytic solution and disposing the first electrolytic solution between the positive electrode active material layer and the negative electrode active material layer; and disposing a second electrolytic solution having a lithium ion concentration higher than that of the first electrolytic solution, in a state in which the second electrolytic solution fluidly communicates with the first electrolytic solution and contacts with at least either of the positive electrode exposed portion and the negative electrode exposed portion.    DESCRIPTION OF DRAWING(S) - The drawing shows a partially cut out cross-sectional view of battery.    Battery (1)    Power-generating element (10)    Positive electrode plates (11)    Aluminum foil (12)    Aluminum exposed portion (14)    Negative electrode plate (21)    Band-shaped copper foil (22)    Copper exposed portion (24)    Separator (30)    First long end edge (31)    second long end edge (32)    Battery case (40)    Battery case body (41)    Sealing lid (42)    Safety valve (47)    Insulating member (48)    Positive electrode current-collecting member (50)    Positive electrode terminal portion (51)    Negative electrode current-collecting member (60)    Negative electrode terminal portion (61)