Patent ID: 11949090
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A winding-type electrode body of a non-aqueous electrolyte secondary battery, the winding-type electrode body comprising a long first electrode and a long second electrode wound together with a separator interposed therebetween, wherein
the first electrode includes a long first electrode core, a first electrode inner mixture layer provided on an inner surface of the first electrode core, and a first electrode outer mixture layer provided on an outer surface of the first electrode core; the second electrode includes a long second electrode core, a second electrode inner mixture layer provided on an inner surface of the second electrode core, and a second electrode outer mixture layer provided on an outer surface of the second electrode core,
the first electrode includes a first electrode core exposed part that is positioned spaced from both of a winding-start end and a winding-finish end in a winding direction, and exposes the first electrode core to be electrically connected with a first electrode lead,
in a winding-start region closer to a winding-start side in the winding direction than the first electrode core exposed part, a first electrode mixture unit amount, which is a first electrode mixture amount per unit length in the winding direction of each of the first electrode inner mixture layer and the first electrode outer mixture layer, is approximately uniform or is increased toward a winding-finish side in the winding direction,
in a winding-start facing region facing the winding-start region across the separator, a second electrode mixture unit amount, which is a second electrode mixture amount per unit length in the winding direction of each of the second electrode inner mixture layer and the second electrode outer mixture layer, is approximately uniform or is increased toward the winding-finish side in the winding direction,
each of the first electrode inner mixture layer and the first electrode outer mixture layer has the first electrode mixture unit amount that differs at two or more positions in the winding direction except for a region in the winding direction where the first electrode core exposed part is provided,
each of the second electrode inner mixture layer and the second electrode outer mixture layer includes a changing part where the second electrode mixture unit amount is changed toward the winding-finish side in the winding direction,
in each of the first electrode inner mixture layer and the first electrode outer mixture layer, a first electrode winding-start mixture unit amount, which is the first electrode mixture unit amount in the winding-start region, is approximately uniform regardless of a position in the winding direction; a first electrode winding-finish mixture unit amount, which is the first electrode mixture unit amount in a winding-finish region closer to the winding-finish side than the first electrode core exposed part, is approximately uniform regardless of a position in the winding direction, and is larger than the first electrode winding-start mixture unit amount, and
in each of the second electrode inner mixture layer and the second electrode outer mixture layer, a second electrode winding-start mixture unit amount, which is the second electrode mixture unit amount in the winding-start facing region, is approximately uniform regardless of a position in the winding direction; a second electrode winding-finish mixture unit amount, which is the second electrode mixture unit amount in a winding-finish facing region facing the winding-finish region across the separator, is approximately uniform regardless of a position in the winding direction, and is larger than the second electrode winding-start mixture unit amount.