Abstract: An electrode winding apparatus and method of detecting displacement between a strip-shaped electrode and a strip-shaped separator when stacking and winding the strip-shaped electrode and the strip-shaped separator is described. A winding shaft is configured to wind the strip-shaped electrode and the strip-shaped separator, and a guide member is configured to stack the strip-shaped electrode and the strip-shaped separator before the strip-shaped electrode and the strip-shaped separator are wound around the winding shaft. An imaging device is disposed so as to photograph a portion in which the strip-shaped electrode and the strip-shaped separator are stacked between the guide member and the winding shaft from a side on which the strip-shaped separator is stacked. The imaging device is configured to photograph the strip-shaped separator and the strip-shaped electrode through the strip-shaped separator.

Abstract: Provided is a battery fabrication method capable of collecting foils by reforming a collector with ease and at a high quality. The battery fabrication method is to fabricate a battery (10) including an electrode body (30) formed such that a positive electrode foil (31), a part of the surface of which is coated with a positive electrode mixture, and a negative electrode foil (32), a part of which is coated with a negative electrode mixture, are stacked with a separator (33) interposed therebetween and the stacked foils are rolled. In the processes of the battery fabrication method, when the electrode body (30) is formed by the rolling, the mixture non-coated parts (35, 36) of the positive electrode foil (31) and negative electrode foil (32) are reformed by use of a reforming roll (50, 50), thereby collecting into bundles (35a,36a) a plurality of foils having different rounds in the radial direction of the electrode body (30) at the mixture non-coated parts (35, 36).

Abstract: A method for producing a wound electrode assembly includes steps of: overlaying electrode strips (11, 13) and separator strips (12, 14) on each other, and winding the electrode strips (11, 13) and the separator strips (12, 14) on a take-up shaft (20) while pressing a pressing member (30) against the electrode strips and the separator strips. In the winding step, the pressing force of the pressing member (30) is increased with decrease in a tension T applied to at least one of the electrode strips (11, 13) and the separator strips (12, 14).

Abstract: A method for producing a wound electrode assembly includes steps of overlaying electrode strips (11, 13) and separator strips (12, 14) on each other, and winding the electrode strips (11, 13) and the separator strips (12, 14) on a take-up shaft (20) while pressing a pressing member (30) against the electrode strips and the separator strips. In the winding step, the pressing force of the pressing member (30) is increased with decrease in a tension T applied to at least one of the electrode strips (11, 13) and the separator strips (12, 14).

Abstract: In a displacement detecting method, displacement between a strip-shaped electrode (13) and the strip-shaped separator (14) is detected. The strip-shaped separator (14) is semitransparent. In the method, first, the strip-shaped electrode (13) is photographed through the strip-shaped separator (14) at a position where the strip-shaped electrode (13) and the strip-shaped separator(14) are stacked (photographing step). Based on an image photographed in the photographing step, displacement between the strip-shaped electrode (13) and the strip-shaped separator (14) is detected (displacement detecting step). In a displacement amount measuring method of measuring the displacement amount, the displacement amount between the strip-shaped electrode (13) and the strip-shaped separator (14) is calculated based on the image photographed in the photographing step.