Roll press device and control device

A control device used in a roll press device comprising:

• a first pressure roller and a second pressure roller that sandwich an electrode plate of a secondary battery that is continuously conveyed, thereby rolling the electrode plate;
• a first main bearing part and a second main bearing part that are provided on one side and the other side of a rotating shaft of the first pressure roller, respectively, and that rotatably support the rotating shaft;
• a third main bearing part and a fourth main bearing part that are provided on one side and the other side of a rotating shaft of the second pressure roller, respectively, and that rotatably support the rotating shaft;
• a first bend bearing part and a second bend bearing part that are provided on one side and the other side of the rotating shaft of the first pressure roller, respectively, and that rotatably support the rotating shaft;
• a third bend bearing part and a fourth bend bearing part that are provided on one side and the other side of the rotating shaft of the second pressure roller, respectively, and that rotatably support the rotating shaft;
• a first press mechanism including a first press cylinder that is configured to apply a load to at least one of the first main bearing part and the third main bearing part in a direction in which the first pressure roller and the second pressure roller become close to each other;
• a second press mechanism including a second press cylinder that is configured to apply a load to at least one of the second main bearing part and the fourth main bearing part in the direction in which the first pressure roller and the second pressure roller become close to each other;
• a first bend mechanism including a first bend cylinder that is configured to apply a load to the first bend bearing part and the third bend bearing part in a direction in which the first pressure roller and the second pressure roller become separated from or close to each other;
• a second bend mechanism including a second bend cylinder that is configured to apply a load to the second bend bearing part and the fourth bend bearing part in the direction in which the first pressure roller and the second pressure roller become separated from or close to each other;
• and
• a thickness meter that is provided on an exit side of the first and second pressure rollers and that detects a thickness of the electrode plate of the secondary battery at three or more points in a width direction of the electrode plate, comprising:
• a logic controller that calculates respective pressure setting values of the first press mechanism, the second press mechanism, the first bend mechanism, and the second bend mechanism on the basis of thickness measurement values at the three or more points that are based on detection values from the thickness meter and of a thickness target value;
• and
• an actuator controller that controls each load in the first press mechanism, the second press mechanism, the first bend mechanism, and the second bend mechanism based on the pressure setting values calculated by the logic controller, wherein
• the logic controller calculates three feature amounts:
• a deviation between a thickness measurement value at a central point among the three or more points and the thickness target value, a quadratic component of a thickness profile of the electrode plate, and a linear component of the thickness profile of the electrode plate, and adaptively changes the respective pressure setting values of the first press mechanism, the second press mechanism, the first bend mechanism, and the second bend mechanism based on the three feature amounts,
• the three or more points at which the thickness meter detects the thickness of the electrode plate of the secondary battery include:
• a first point that is set at a first end of the electrode plate of the secondary battery on the side where the first press mechanism is provided;
• a second point that is set at a center part of the electrode plate of the secondary battery;
• and
• a third point that is set at a second end of the electrode plate of the secondary battery on the side where the second press mechanism is provided,
• the thickness meter detects the thickness of the electrode plate of the secondary battery at the first point, the second point, and the third point arranged in the width direction of the electrode plate,
• the logic controller calculates the respective pressure setting values of the first press mechanism, the second press mechanism, the first bend mechanism, and the second bend mechanism on the basis of a first point thickness measurement value, a second point thickness measurement value, and a third point thickness measurement value that are based on detection values from the thickness meter and of the thickness target value,
• from the first point thickness measurement value, the second point thickness measurement value, the third point thickness measurement value, and the thickness target value, the logic controller calculates the three feature amounts:
• the deviation between the second point thickness measurement value and the thickness target value, the quadratic component of the thickness profile of the electrode plate, and the linear component of the thickness profile of the electrode plate,
• the quadratic component of the thickness profile of the electrode plate is a sum of a difference between the second point thickness measurement value and the first point thickness measurement value and a difference between the second point thickness measurement value and the third point thickness measurement value, and
• the linear component of the thickness profile of the electrode plate is a difference between the first point thickness measurement value and the third point thickness measurement value.