Prismatic secondary battery

摘要

A prismatic secondary battery is provided with a negative/positive electrode collector (18), which are disposed on either one of a wound negative/positive electrode substrate exposed portion (15), and a negative/positive electrode collector receiving member (19) which is disposed on another surface. At least one of the negative/positive electrode collector has a recess portion (30) formed in part on a surface on the side not facing the negative/positive electrode substrate exposed portions so as to be thinner than the thickness of the other portion. Resistance welding is carried out in this recessed part, thereby a large welding nugget is formed between the negative/positive electrode exposed portion and the negative/positive electrode collector.

主权项

1. A prismatic secondary battery comprising:
an electrode assembly including stacked or wound negative electrode substrate exposed portions and positive electrode substrate exposed portions; a negative electrode collector and a positive electrode collector electrically connected to the negative electrode substrate exposed portions and the positive electrode substrate exposed portions, respectively; and a negative electrode terminal and a positive electrode terminal electrically connected to the negative electrode collector and the positive electrode collector, respectively, at least one of the negative electrode substrate exposed portions and/or the positive electrode substrate exposed portions being connected to one surface with the negative electrode collector and/or the positive electrode collector, respectively, and being connected at another surface with a negative electrode collector receiving member or a positive electrode collector receiving member, and at least one of the negative electrode collector and the positive electrode collector being made of metal and having a recess portion formed in part on a surface on the side not facing the negative electrode substrate exposed portions or the positive electrode substrate exposed portions in a region facing the negative electrode substrate exposed portions or the positive electrode substrate exposed portions, the thickness of the recess portion being formed to be smaller than the thickness of the other metal portions of the negative electrode collector or the positive electrode collector, and resistance welding being carried out in the recess portion, and wherein the recess portion comprises a bottom and a side wall standing from the bottom.