Lithium ion secondary cell

A lithium ion secondary cell comprising a plurality of single cells composed of a collector comprising:

• positive electrodes composed of a metallic material coated with a positive electrode active substance;
• negative electrodes composed of a metallic material coated with a negative electrode active substance;
• separators interposed between said positive and negative electrodes;
• lugs of said metallic materials where said active substance is not coated;
• conductors electrically connected to said lugs of each of the positive and negative electrodes;
• and
• conductive spacers disposed between said lugs of each of the positive and negative electrodes for maintaining constant spacing between each of the positive and negative electrodes,
• said positive and negative electrodes being assembled in laminate alternately, and the spacers disposed between the lugs of the positive electrodes and the spacers disposed between the lugs of the negative electrodes being secured in position to electrically connect the electrodes of the single cells so that electric current may be taken out through said spacers.

A lithium ion secondary cell comprising an assembly of series-connected single cells each comprising a collector comprising:

• positive electrodes composed of a metallic material coated with a positive electrode active substance;
• negative electrodes composed of a metallic material coated with a negative electrode active substance;
• separators disposed between said positive and negative electrodes;
• lugs of said metallic materials where said active material is not coated;
• and
• conductors connected separately to said lugs of the positive and negative electrodes,
• the conductors electrically and thermally connected to said collectors being so arranged that at least one conductor per cell for each electrode is extended directly from each cell, to the outside of a cell container through a wall thereof so that electric current can be taken out through said conductors while allowing release therethrough of the heat accumulated in the cell during charge and discharge, thereby preventing a rise of temperature in the cell.