COLLECTOR AND ELECTRODE FOR USE IN NONAQUEOUS ELECTROLYTE SECONDARY CELL, NONAQUEOUS ELECTROLYTE SECONDARY CELL, AND MANUFACTURING METHOD THEREOF

摘要

Disclosed is a collector constituted by forming multiple through holes in a metal foil. The metal foil is divided into two regions, a far region, which is a longer distance from the external terminal connection point, and a near region, which is a shorter distance from the connection point and has the same surface area as the far region. The hole ratio in the far region is greater than in the near region. This makes it possible to reduce electrical resistance in the near region to less than that in the far region. Consequently, heat caused by the passage of a current through the near region can be reduced.