Roll press device and control device

A roll press device comprising:

• a first pressure roller and a second pressure roller structured to roll an electrode plate of a secondary battery to be continuously conveyed by sandwiching the electrode plate;
• a first main bearing and a second main bearing provided on one side and the other side of a rotation shaft of the first pressure roller, respectively, and structured to rotatably support the rotation shaft;
• a third main bearing and a fourth main bearing provided on one side and the other side of a rotation shaft of the second pressure roller, respectively, and structured to rotatably support the rotation shaft;
• a first bend bearing and a second bend bearing provided on one side and the other side of the rotation shaft of the first pressure roller, respectively, and structured to rotatably support the rotation shaft;
• a third bend bearing and a fourth bend bearing provided on one side and the other side of the rotation shaft of the second pressure roller, respectively, and structured to rotatably support the rotation shaft;
• a first compression mechanism capable of applying a load to at least one of the first main bearing and the third main bearing in a direction in which the first pressure roller and the second pressure roller approach each other;
• a second compression mechanism capable of applying a load to at least one of the second main bearing and the fourth main bearing in a direction in which the first pressure roller and the second pressure roller approach each other;
• a first bend mechanism capable of applying a load to at least one of the first bend bearing and the third bend bearing in a direction in which the first pressure roller and the second pressure roller are separated from each other;
• a second bend mechanism capable of applying a load to at least one of the second bend bearing and the fourth bend bearing in a direction in which the first pressure roller and the second pressure roller are separated from each other;
• a thickness meter provided on an exit side of the first pressure roller and the second pressure roller and structured to detect a thickness of the electrode plate of the secondary battery at three or more points in a width direction of the electrode plate, wherein the thickness meter detects the thickness of the electrode plate of the secondary battery at each of a first point, a second point, and a third point arranged in the width direction of the electrode plate;
• a calculator structured to calculate setting values of the first compression mechanism, the second compression mechanism, the first bend mechanism, and the second bend mechanism on the basis of a first point thickness measurement value at the first point, a second point thickness measurement value at the second point, and a third point thickness measurement value at the third point based on detection values of the thickness meter and a thickness target value, wherein
• the first point is set to an end portion of the electrode plate of the secondary battery on the side where the first compression mechanism is provided,
• the second point is set to a center portion of the electrode plate of the secondary battery, and
• the third point is set to an end portion of the electrode plate of the secondary battery on the side where the second compression mechanism is provided;
• and
• a controller structured to control loads of the first compression mechanism, the second compression mechanism, the first bend mechanism, and the second bend mechanism on the basis of the setting values calculated by the calculator,
• wherein the calculator calculates three feature amounts of a first deviation between the thickness target value and a thickness measurement value of a point closest to the first compression mechanism among the three or more points, a second deviation between the thickness target value and a thickness measurement value of a point closest to the second compression mechanism among the three or more points, and a secondary component of a thickness profile of the electrode plate, and adaptively changes the setting values of the first compression mechanism, the second compression mechanism, the first bend mechanism, and the second bend mechanism on the basis of the three feature amounts,
• the calculator calculates the three feature amounts of the first deviation between the first point thickness measurement value and the thickness target value, the second deviation between the third point thickness measurement value and the thickness target value, and the secondary component of the thickness profile of the electrode plate from the first point thickness measurement value, the second point thickness measurement value, the third point thickness measurement value, and the thickness target value, and
• the secondary component of the thickness profile of the electrode plate is defined by a difference between the second point thickness measurement value and an average value of the first point thickness measurement value and the third point thickness measurement value.