Battery cell and device provided with the battery cell

A battery cell comprising:

• at least one electrode assembly formed by flatly winding a band-shaped positive electrode and a band-shaped negative electrode stacked with a separator therebetween;
• a cell case in which the electrode assembly is housed;
• a positive-electrode external terminal structure arranged outside the cell case;
• a negative-electrode external terminal structure arranged outside the cell case;
• a first current collector electrically connected to a layer stack composed only of the band-shaped positive electrode and located on one end side of the electrode assembly in the width direction thereof, and electrically connected to the positive-electrode external terminal structure;
• and
• a second current collector electrically connected to a layer stack composed only of the band-shaped negative electrode and located on the other end side of the electrode assembly in the width direction thereof, and electrically connected to the negative-electrode external terminal structure, wherein
• the first current collector is connected to any one of:
• part of both of a pair of positive-electrode layer stack sections;
• part of any one of the pair of positive-electrode layer stack sections;
• and the whole of any one of the pair of the positive-electrode layer stack sections, of the layer stack composed only of the band-shaped positive electrode, the pair of the positive-electrode layer sections extending in a cross-sectional long axis direction of the electrode assembly respectively in two regions bounded by a first virtual plane passing through a winding center of the electrode assembly and spreading in the long axis direction, the second current collector is connected to any one of:
• part of both of a pair of negative-electrode layer stack sections;
• part of any one of the pair of negative-electrode layer stack sections;
• and the whole of any one of the pair of the negative-electrode layer stack sections, of the layer stack composed only of the band-shaped negative electrode, the pair of the negative-electrode layer stack sections extending in the long axis direction respectively in the two regions, and
• a connecting location between the first current collector and the positive-electrode layer stack section and a connecting location between the second current collector and the negative-electrode layer stack section are set so as to be asymmetrical to each other with respect to a second virtual plane passing through a center of the electrode assembly in the width direction thereof and being orthogonal to the first virtual plane.