NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

The objective of the present invention is to provide a non-aqueous electrolyte secondary battery in which swelling that accompanies charge-discharge cycles has been suppressed. This non-aqueous electrolyte secondary battery has a flat-shaped electrode body comprising a first electrode plate and a second electrode plate with a separator therebetween, which have been wound. The first electrode plate is disposed more to the inner peripheral side of the electrode body than the second electrode plate. Provided in order from the winding start end of the first electrode plate are a two-side exposed core body portion, and a single-side exposed core body portion where an active substance layer has been formed only on the outer peripheral surface of the core body. A collector tab is connected to the two-side exposed core body portion. Among the corner portions of the innermost peripheral portion of the first electrode plate, at least one is occupied by the single-side exposed portion. In this corner portion, the active substance layer formed on the outer peripheral surface of the single-side exposed portion faces the active substance layer formed on the inner peripheral surface of the second electrode plate with a separator therebetween. A spacer is disposed on the inner peripheral surface of the first electrode plate in this corner portion.