Battery pack

A battery pack comprising:

• a battery unit that includes a bottom-closed hollow exterior container, an electrode assembly of positive and negative electrode plates that face each other and are accommodated in the exterior container, positive and negative electrode tabs that extend from said positive and negative electrode plates and are arranged in parallel to each other in said exterior container, and a sealing plate that closes the opening of said exterior container;
• a circuit board that is arranged on or above an exterior surface of said battery unit, and includes external positive and negative terminals through which electric power can be supplied;
• a first wiring path that connects said positive electrode tab to said external positive terminal through said sealing plate and said circuit board;
• and
• a second wiring path that connects said negative electrode tab to said external negative terminal through said circuit board,
• wherein a current loop is formed from said positive electrode plate through said positive electrode tab, said first wiring path, said external positive terminal, said external negative terminal, said second wiring path and said negative electrode tab in this order to said negative electrode plate when electric power is supplied, and
• wherein as viewed in a plan view along said positive and negative electrode tabs, which are arranged in parallel to each other, in the current loop shape that is projected onto this plan view,
• said first and second wiring paths intersect each other at the position where said first and second wiring paths pass said sealing plate, and
• wherein the current flow direction of a current loop part that is formed from the intersection position on the exterior side of the battery unit is opposite to the current flow direction of another current loop part that is formed from the intersection position on the interior side of the battery unit.