ELECTRODE SURFACE PRESSING METHOD FOR RECTANGULAR SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a means for applying pressure uniformly over the entire region of electrode surfaces of all electrodes in order to minimize local dispersion of electrochemical reactions in the electrodes, and to provide an intermediate capacity rectangular secondary battery having a lightweight case structure being not deformed by the pressure. SOLUTION: A pressing mat 8 is located medially between two groups of electrode laminated bodies 7, and a medium such as a gas for generating pressure is confined in the interior of the pressing mat 8. The pressure is uniformly generated over the entire surface of the pressing mat 8, thereby uniformly applying the pressure to the entire region of electrode surfaces of all electrodes of the electrode laminated bodies 7. Electrochemical reactions are equalized while maintaining electrode clearances constant. Even if the thickness of a case 1 is small, a side plate of the case 1 is underformed by the pressure because a corrugated reinforcing plate 2 is bonded to the side plate.