NON-AQUEOUS ELECTROLYTIC SECONDARY BATTERY AND METHOD OF MANUFACTURING THE SAME

摘要

A flat-plate portion (Fp) of a negative electrode composite material layer includes a first end portion (E1) at one end portion in a direction of axis of winding (AD) of a flat electrode winding assembly (80), a second end portion (E2) located opposite to the first end portion (E1), and a central portion (CR) lying between the first end portion (E1) and the second end portion (E2). The flat-plate portion (Fp) of the negative electrode composite material layer is provided with a plurality of communication grooves (Tr) extending from the first end portion (E1) to the second end portion (E2). The communication groove (Tr) includes a first terminal end portion (Tr1) at the first end portion (E1), includes a second terminal end portion (Tr2) at the second end portion (E2), includes in the central portion (CR), a starting portion (Tr0) located closer to a bottom portion of a prismatic case relative to the first terminal end portion (Tr1) and the second terminal end portion (Tr2), and extends from the starting portion (Tr0) toward the first terminal end portion (Tr1) and the second terminal end portion (Tr2). The negative electrode composite material layer (22) includes a plurality of granules. The granule contains a negative electrode active material and a binder.