Power storage device and method of manufacturing power storage device
A power storage device includes a positive electrode and a negative electrode facing each other, a separator disposed between the positive electrode and the negative electrode, the separator being porous, and a sealing member made of a resin and sealing a space between the positive electrode and the negative electrode. The separator includes a material having a melting temperature higher than a melting temperature of a resin material of the sealing member. The separator has an edge portion sandwiched and held in the sealing member in a state where the edge portion is joined to a melted-then-solidified portion of the resin material of the sealing member.
1 . A power storage device comprising: a cell stack in which power storage cells are stacked in a stacking direction; each of the power storage cells including: a positive electrode and a negative electrode facing each other; a separator disposed between the positive electrode and the negative electrode, the separator being porous; and a sealing member made of a resin and sealing a space between the positive electrode and the negative electrode, wherein the separator includes a material having a melting temperature higher than a melting temperature of a resin material of the sealing member, the separator has an edge portion sandwiched and held in the sealing member in a state where the edge portion is joined to a melted-then-solidified portion of the resin material of the sealing member, wherein the melted-then-solidified portion is uniform on an outer surface of the edge portion of the separator, and a protruded portion of the sealing member of adjacent ones of the stacked power storage cells are joined to each other.
2 . The power storage device according to claim 1 , wherein the melted-then-solidified portion is positioned in a hole of the edge portion of the separator.
3 . The power storage device according to claim 1 , wherein the sealing member includes a first resin portion welded to an edge of a metal foil of the positive electrode, and a second resin portion welded to an edge of a metal foil of the negative electrode, wherein the first resin portion and the second resin portion are welded to each other in each of the power storage cells.
4 . The power storage device according to claim 3 , wherein an edge of the first resin portion and an edge of the second resin portion protrude outward from the edge of the metal foil of the positive electrode and the edge of the metal foil of the negative electrode, respectively, to form the protruded portion of the sealing member.
5 . The power storage device according to claim 1 , wherein the protruded portion protrudes outward from the edge of the metal foil of the positive electrode and the edge of the metal foil of the negative electrode.