SECONDARY BATTERY AND METHOD FOR PRODUCING SECONDARY BATTERY

• Main Authors: TANAHASHI, Yuta, TSUKAGOSHI, Takafumi, MIYAZAKI, Shinya, MITA, Kazutaka
• Format: Patent
• Language: English; French; German
• Published: 24.08.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present disclosure provides a secondary battery in which the occurrence of springback is suppressed in a wound electrode body having specific external shape dimensions. The secondary battery disclosed herein has a flat-shaped wound electrode body and a battery case that accommodates the wound electrode body. A separator of such a secondary battery has a band-shaped base material layer, and a surface layer containing inorganic particles and a binder. At least one from among a positive electrode plate and a negative electrode plate is bonded to the surface layer of the separator. A width dimension of the positive electrode active material layer in the secondary battery disclosed herein is 200 mm or larger, a thickness dimension of the wound electrode body is 8 mm or larger, and a height dimension of the wound electrode body is 120 mm or smaller. The art disclosed herein allows suitably suppressing the occurrence of springback, despite using a wound electrode body having external shape dimensions that readily give rise to springback.