Multiply stacked electrochemical cell and method for preparing the same

A method of manufacturing an electrochemical element comprising electrochemical cells which are multiply stacked and filled within a battery case, said electrochemical cells formed by stacking full cells having a cathode, a separator layer, and an anode sequentially as a basic unit, and a separator film having a unit length which is determined to wrap the electrochemical cells and folding outward every unit length to fold each electrochemical cell in a Z-shape starting from the electrochemical cell of a first spot to the electrochemical cell of the last spot continuously while the remaining separator film wraps an outer portion of the stacked cell, said separator film interposed between each stacked full cell comprising the steps of,

• a) placing a full cell on and below the separator film continuously or alternately;
• b) laminating said placed full cells and said separator film of a);
• and
• c) folding outward said laminated full cells and said separator film of b) to the full cell adjacent next to the first full cell to fold each full cell in a Z-shape and wrapping the remaining separator film round an outer portion of the stacked full cell at least once so that each full cell is stacked.

An electrochemical element comprising electrochemical cells which are multiply stacked, said electrochemical cells formed by stacking

• i) a bicell having a cathode;
• a separator layer;
• an anode;
• another separator layer;
• and another cathode sequentially as a basic unit;
• or
• ii) a bicell having an anode;
• a separator layer;
• a cathode;
• another separator layer;
• and another anode sequentially as a basic unit;
• and a separator film interposed between each stacked bicells wherein,
• said separator film has a unit length which is determined to wrap the electrochemical cells, and folds outward every unit length to fold each electrochemical cell in a Z-shape starting from the electrochemical cell of a first spot to the electrochemical cell of the last spot continuously while the remaining separator film wraps an outer portion of the stacked cell.

A method of manufacturing an electrochemical element comprising electrochemical cells which are multiply stacked, said electrochemical cells formed by alternately stacking i) a bicell having a cathode;

• a separator layer;
• an anode;
• another separator layer;
• and another cathode sequentially as a basic unit;
• or ii) a bicell having an anode;
• a separator layer;
• a cathode;
• another separator layer;
• and another anode sequentially as a basic unit;
• and a separator film having a unit length which is determined to wrap the electrochemical cells and folding outward every unit length to fold each electrochemical cell in a Z-shape starting from the electrochemical cell of a first spot to the electrochemical cell of the last spot continuously while the remaining separator film wraps an outer portion of the stacked cell, said separator film interposed between each stacked bicell comprising the steps of,
• a) placing a bicell on and below the separator film continuously or alternately;
• b) laminating said placed bicells and said separator film of a);
• and
• c) folding outward said laminated bicells and said separator film of b) to the bicell adjacent next to the first bicell to fold each bicell in a Z-shape and wrapping the remaining separator film round an outer portion of the stacked bicell at least once so that each bicell is stacked.