Electric storage element

An electric storage element comprising:

• a casing;
• a positive external terminal and a negative external terminal respectively comprising exposed portions exposed from the casing to the outside;
• a positive current collector and a negative current collector arranged inside the casing and respectively connected to the positive external terminal and the negative external terminal;
• a plurality of electrode assemblies arranged inside the casing so as to be arranged adjacent to each other, each of the electrode assemblies having a positive electrode, a negative electrode, and a separator each of which has a strip-like shape, the positive and negative electrodes being wound with the separator being interposed therebetween so as to have positions shifted to opposite sides in a width direction with reference to the separator, the positive electrode being connected to the positive current collector at a first end of the plurality of electrode assemblies, and the negative electrode being connected to the negative current collector at a second end of the plurality of electrode assemblies;
• a gap formed at one of the first and second ends of the plurality of electrode assemblies, and defined between the two electrode assemblies arranged adjacent to each other and a bottom of the casing so as to extend between a positive current collector side and a negative current collector side and to allow fluid communication between the positive current collector side and the negative current collector side;
• and
• a closure member placed at the other of the first and second ends of the plurality of electrode assemblies, and forming a closed end of the gap.