Electrode plate for battery, electrode group for battery, lithium secondary battery, method for producing electrode plate for battery and apparatus for producing electrode plate for battery

A method for producing an electrode plate for a nonaqueous battery, the method comprising the steps of:

• a) preparing an electrode plate hoop material including a both-surface coated part in which an active material layer is provided on both surfaces of a current collector core material, a one-surface coated part in which the active material layer is provided on only one of surfaces of the current collector core material and a core material exposed part in which the active material layer is not provided, the both-surface coated part, the one-surface coated part and the core material exposed part being continuously formed in this order;
• b) rotating a pair of rollers each of which has a plurality of line projections formed on a surface thereof and which are arranged on and under the electrode plate hoop material with the pair of rollers pressed against both surfaces of the electrode plate hoop material to pass the electrode plate hoop material through a space between the pair of rollers, thereby simultaneously forming a plurality of grooves in both surfaces of the both-surface coated part so that the plurality of grooves are tilted from a longitudinal direction of the electrode plate hoop material;
• c) maintaining, after the both-surface coated part is passed through the space between the pair of rollers, the pair of rollers in a no pressure applied state for the one-surface coated part while the one-surface coated part is passed through the space between the pair of rollers;
• and
• d) cutting the negative electrode plate hoop material at the core material exposed part provided between the both-surface coated part and the one-surface coated part to divide the electrode plate hoop material into electrode plates for a battery.

An apparatus for producing an electrode plate for a nonaqueous battery, the apparatus comprising:

• a pair of rollers each of which has a plurality of line projections formed on a surface thereof;
• conveying force generating means for adding, to an electrode plate hoop material in which an active material layer is formed on the surfaces of a current collector core material, a conveying force for passing the electrode plate hoop material through the space between the pair of rollers;
• pressure adjusting means for adjusting a level of a pressure which the pair of rollers apply to the electrode plate hoop material;
• distance adjusting means for adjusting a distance between the pair of rollers;
• and
• control means for performing control in a manner in which the electrode plate hoop material formed so that both-surface coated part in which the active material layer is provided on both surfaces of the current collector core material, a one-surface coated part in which the active material layer is provided on only one of surfaces of the current collector core material and a core material exposed part in which the active material layer is not provided are continuously formed in this order is passed though the space between the pair of rollers and the rollers are rotated while being pressed against both surfaces of the negative electrode plate hoop material with application of a constant pressure adjusted by the pressure adjusting means to both surfaces of the electrode plate hoop material, thereby simultaneously forming a plurality of grooves in both surfaces of the both-surface coated part so that the plurality of grooves are tilted from a longitudinal direction of the electrode plate hoop material, and
• after the both-surface coated part is passed through the space between the pair of rollers, the pair of rollers are maintained in a no pressure applied state for the one-surface coated part by the distance adjusting means while the one-surface coated part is passed through the space between the pair of rollers.

A method for producing an electrode plate for a nonaqueous battery, the method comprising the steps of:

• preparing an electrode plate hoop material including the both-surface coated part in which the active material layer is provided on both surfaces of the current collector core material, the one-surface coated part in which the active material layer is provided on only one surface of the current collector core material and a core material exposed part in which the active material layer is not provided, the both-surface coated part, the one-surface coated part and the core material exposed part being continuously formed in this order;
• forming the plurality of grooves on both surfaces of the both-surface coated part;
• and
• cutting the electrode plate hoop material at the core material exposed part provided between the both-surface coated part and the one-surface coated part to divide the electrode plate hoop material into electrode plates for a battery,
• wherein in the forming step, the grooves are not formed on the surface of the one-surface coated part.