Electrode cutting device and stacked cell manufacturing device

1 . An electrode cutting device arranged to cut a conductive sheet into electrode plates by a certain length, comprising:

a fixed blade having a fixed cutting blade extending in a direction crossing a conveyance direction of a conductive sheet;

a rotary blade of a disk shape having a rotary cutting blade on a radial outer edge;

a first conveying roller unit disposed on an upstream side of the rotary blade and the fixed blade in the conveyance direction of the conductive sheet; and

a second conveying roller unit disposed on a downstream side of the same,

wherein:

each of the first conveying roller unit and the second conveying roller unit grabs the conductive sheet in a thickness direction, and applies a conveying tension to the conveyed conductive sheet in the conveyance direction, and

when cutting the conductive sheet by the rotary blade and the fixed blade, conveyance of the conductive sheet is stopped, and a tension of the conductive sheet at a part between the first conveying roller unit and the second conveying roller unit is varied with respect to the conveying tension, and

wherein the rotary blade is rotated and moved along the fixed blade.

2 . The electrode cutting device according to claim 1 , wherein the rotary blade rotates and moves along the fixed blade in a state where the rotary blade maintains contact with the fixed blade.

3 . The electrode cutting device according to claim 2 , wherein the rotary blade is applied with a force to press toward the fixed blade.

4 . The electrode cutting device according to claim 1 , wherein a feed amount of the rotary blade with respect to the fixed blade and a rotation speed of the rotary blade are variable.

5 . The electrode cutting device according to claim 1 , wherein;

when cutting of the conductive sheet is finished, the rotary blade is idled, and

an idle rotation angle of the rotary blade is variable for every set number of cutting.

6 . The electrode cutting device according to claim 1 , wherein when cutting the conductive sheet, the first conveying roller unit is stopped, and after a certain time elapses, the second conveying roller unit is stopped.

7 . The electrode cutting device according to claim 1 , wherein when cutting the conductive sheet, the first conveying roller unit and the second conveying roller unit are both stopped, and then the second conveying roller unit is rotated by a certain amount in an opposite direction to the conveyance direction of the conductive sheet.

8 . The electrode cutting device according to claim 1 , further comprising:

an electrode cutting unit arranged to cut the conductive sheet into the electrode plates by a certain length; and

a notch forming unit arranged to form notches on both ends in a width direction of the conductive sheet, so as to support a part to be cut by the electrode cutting unit,

wherein:

the notch forming unit includes a notching mold that forms the notches in the conductive sheet and can move in the width direction, and an edge detector disposed on the upstream side of the notching mold in the conveyance direction of the conductive sheet so as to detect an edge of the conductive sheet in the width direction, and

the notching mold is moved so that the notch is accurately formed at the edge of the conductive sheet in the width direction, based on the edge of the conductive sheet detected by the edge detector.

9 . A stacked cell manufacturing device arranged to manufacture a stacked cell in which, electrode plates to be negative electrode plates and electrode plates to be positive electrode plates are alternately disposed and stacked in valley fold parts of a bellows-shaped folded separator, the device comprising:

a separator feed unit having a separator roller to feed a separator in a tape shape;

a folding unit arranged to fold the separator fed from the separator roller in a bellows shape; and

an electrode feed unit arranged to feed the negative electrode plates and the positive electrode plates alternately to the separator folded in the bellows shape by the folding unit,

wherein:

the electrode feed unit includes two electrode plate feed units,

one of the electrode plate feed units is disposed on one side so as to feed the electrode plate to be the negative electrode plate, while the other electrode plate feed unit is disposed on the other side so as to feed the electrode plate to be the positive electrode plate,

each of the electrode plate feed units includes an electrode cutting unit that cuts a conductive sheet into the electrode plates by a certain length,

wherein the electrode cutting unit includes:

a fixed blade having a fixed cutting blade extending in a direction crossing a conveyance direction of the conductive sheet,

a rotary blade of a disk shape having a rotary cutting blade on a radial outer edge,

a rotary blade moving unit that rotates and moves the rotary blade along the fixed cutting blade,

a first conveying roller unit disposed on an upstream side of the rotary blade and the fixed blade in the conveyance direction of the conductive sheet, and

a second conveying roller unit disposed on a downstream side of the same, and

wherein:

each of the first conveying roller unit and the second conveying roller unit grabs the conductive sheet in a thickness direction, and applies a conveying tension to the conveyed conductive sheet in the conveyance direction, and

when cutting the conductive sheet by the rotary blade and the fixed blade, conveyance of the conductive sheet is stopped, and a tension of the conductive sheet at a part between the first conveying roller unit and the second conveying roller unit is varied with respect to the conveying tension.

10 . The stacked cell manufacturing device according to claim 9 , wherein the rotary blade moving unit rotates and moves the rotary blade along the fixed cutting blade in a state where contact between the rotary cutting blade and the fixed cutting blade is maintained.

11 . The stacked cell manufacturing device according to claim 10 , further comprising a biasing unit that applies a force to press the rotary blade toward the fixed blade.

12 . The stacked cell manufacturing device according to claim 9 , wherein a feed amount of the rotary blade with respect to the fixed blade and a rotation speed of the rotary blade are variable.

13 . The stacked cell manufacturing device according to claim 9 , wherein:

when cutting of the conductive sheet is finished, the rotary blade is idled, and

an idle rotation angle of the rotary blade is variable for every set number of cutting.

14 . The stacked cell manufacturing device according to claim 9 , wherein when cutting the conductive sheet, the electrode cutting unit stops the first conveying roller unit, and after a certain time elapses, the electrode cutting unit stops the second conveying roller unit.

15 . The stacked cell manufacturing device according to claim 9 , wherein when cutting the conductive sheet, after both the first conveying roller unit and the second conveying roller unit stop, the electrode cutting unit rotates the second conveying roller unit by a certain amount in an opposite direction to the conveyance direction of the conductive sheet.

16 . The stacked cell manufacturing device according to claim 9 , further comprising a notch forming unit arranged to form notches on both ends in a width direction of the conductive sheet, so as to support a part to be cut by the electrode cutting unit,

wherein:

the notch forming unit includes a notching mold that forms the notches in the conductive sheet and can move in the width direction, and an edge detector disposed on the upstream side of the notching mold in the conveyance direction of the conductive sheet so as to detect an edge of the conductive sheet in the width direction, and

the notching mold is moved so that the notch is accurately formed at the edge of the conductive sheet in the width direction, based on the edge of the conductive sheet detected by the edge detector.