A method of preparing a laminated cell, comprising steps of: laying out a plurality of first electrodes successively and intervally between two separators along a first direction, such that the plurality of first electrodes and the two separators form together an internal layer; laying out a plurality of second electrodes successively on both surface sides of the internal layer along the first direction with the second electrodes on one surface side and the second electrodes on the other surface side placed alternately, such that the plurality of second electrodes and the internal layer form together a composite lamination, wherein each of the second electrodes is parallel to the respective first electrode; pressing the composite lamination, to form a staggered lamination; and folding the staggered lamination in a zigzag manner, characterized in that the step of pressing the composite lamination to form a staggered lamination comprises steps of: heating the composite lamination, such that a hot-melt adhesive adhered to the separator melts; and exerting opposite pressures on the respective second electrodes on both sides of the composite lamination in a stacking layer direction of the second electrodes, the separators and the first electrodes, such that the separators are each creased at an interstice between any two adjacent first electrodes; wherein after the step of exerting opposite pressures on the respective second electrodes on both sides of the composite lamination in a stacking layer direction, the method further comprises a step of: stopping exerting the pressures, when the opposite two sides of the composite lamination are flat. laying out a plurality of first electrodes successively and intervally between two separators along a first direction, such that the plurality of first electrodes and the two separators form together an internal layer; laying out a plurality of second electrodes successively on both surface sides of the internal layer along the first direction with the second electrodes on one surface side and the second electrodes on the other surface side placed alternately, such that the plurality of second electrodes and the internal layer form together a composite lamination, wherein each of the second electrodes is parallel to the respective first electrode; pressing the composite lamination, to form a staggered lamination; and folding the staggered lamination in a zigzag manner, characterized in that the step of pressing the composite lamination to form a staggered lamination comprises steps of: heating the composite lamination, such that a hot-melt adhesive adhered to the separator melts; and exerting opposite pressures on the respective second electrodes on both sides of the composite lamination in a stacking layer direction of the second electrodes, the separators and the first electrodes, such that the separators are each creased at an interstice between any two adjacent first electrodes; wherein after the step of exerting opposite pressures on the respective second electrodes on both sides of the composite lamination in a stacking layer direction, the method further comprises a step of: stopping exerting the pressures, when the opposite two sides of the composite lamination are flat. heating the composite lamination, such that a hot-melt adhesive adhered to the separator melts; and exerting opposite pressures on the respective second electrodes on both sides of the composite lamination in a stacking layer direction of the second electrodes, the separators and the first electrodes, such that the separators are each creased at an interstice between any two adjacent first electrodes; wherein after the step of exerting opposite pressures on the respective second electrodes on both sides of the composite lamination in a stacking layer direction, the method further comprises a step of: stopping exerting the pressures, when the opposite two sides of the composite lamination are flat.