Cell electrode plate and process for producing the same

#The present invention relates to a cell electrode plate and a process for producing the same.

#Conventionally, in production of a cell electrode such as lithium-cell positive pole member, electrode mixture or positive pole active material such as LiCoO2 is applied and dried on a core member or collector made of metal foil such as aluminum foil and is pressed by a roll press machine with press rolls so as to enhance bulk density of the positive pole active material.

#The cell electrode plate thus produced by applying and drying electrode active material such as positive pole active material on the core member is shown in FIGS. 1 and 2 wherein reference numeral 1 denotes a band-like core member or collector made of metal foil such as aluminum foil with substantially uniform width; 2, electrode active material such as positive pole active material applied and dried in the form of sheets on upper and lower surfaces of the core member 1. The core member 1 and the electrode active material 2 provide a cell electrode plate 3. The sheets of electrode active material 2 are of uniform size and are arranged discontinuously on and longitudinally of the core member 1, widths of the core member 1 and the sheets of electrode active material 2 being W and W0, respectively. Distance between a widthwise end of the core member 1 and a corresponding widthwise end of each sheet of the electrode active material 2 is substantially uniform in a lot and is (W−W0)/2 so that the widthwise ends of the sheets of the electrode active material 2 are aligned with each other longitudinally of the cell electrode plate 3.

#FIG. 1 A plan view showing a conventional cell electrode plate and a conventional process for producing the same.

#FIG. 2 A view looking in the direction of arrows II of FIG. 1.

#FIG. 3 A side view showing pressing state of the cell electrode plate by a roll press machine.

#1 Core member made of metal foil 2 electrode active material (sheets of electrode active material) 3 cell electrode plate W1, W2, W3, W4 and W5 widths

#Embodiments of the invention will be disclosed in conjunction with attached drawings.

#FIGS. 6 and 7 show an embodiment of the invention in which parts similar to those shown in FIGS. 1 and 2 are represented by the same reference numerals. A fundamental structure of the embodiment is substantially the same as that of a conventional one. The embodiment resides in that, as shown in FIG. 6, a plurality of sheets of electrode active material 2 applied discontinuously on and longitudinally of a core member 1 made of metal foil have widthwise ends along the width of the core member 1 which are different in position.