Battery and method for producing the same

A method for producing a battery including the steps of:

• (i) forming a first electrode material mixture layer on a first electrode core member to obtain a first electrode having an exposed portion of said first electrode core member on one end portion thereof;
• (ii) forming a second electrode material mixture layer on a second electrode core member to obtain a second electrode;
• (iii) winding or laminating the first electrode and the second electrode with a separator interposed therebetween thereby to constitute an electrode group at one end surface of which said exposed portion of the first electrode core member is protruding from an end portion of the second electrode and an end portion of the separator;
• (iv) preparing a first current collector plate including an intended connection portion on one surface thereof and an insulating layer formed in an area on the other surface thereof except for a reverse face portion of said intended connection portion;
• and
• (v) welding said exposed portion of the first electrode core member to said intended connection portion of the first current collector plate by applying an arc from said other surface of the first current collector plate.

A method for producing a battery including the steps of:

• (i) forming a first electrode material mixture layer on a first electrode core member to obtain a first electrode having an exposed portion of said first electrode core member on one end portion thereof;
• (ii) forming a second electrode material mixture layer on a second electrode core member to obtain a second electrode;
• (iii) winding or laminating the first electrode and the second electrode with a separator interposed therebetween thereby to constitute an electrode group at one end surface of which said exposed portion of the first electrode core member is protruding from an end portion of the second electrode and an end portion of said separator;
• (iv) preparing a first current collector plate including an intended connection portion on one surface thereof;
• (v) disposing an insulating mask having an opening that overlaps said intended connection portion on the other surface of the first current collector plate;
• and
• (vi) welding said exposed portion of the first electrode core member to said intended connection portion of the first current collector plate by applying an arc from said other surface of the first current collector plate.