Battery pack and method for welding cells

摘要

A battery pack with a reduced resistance connection arrangement in which battery cells are arranged in rows in an insulating case and an electrode of each battery cell is coupled to an electrode of another battery cell through a connecting metallic plate. The connecting metallic plate is made of copper and is disposed on a positive electrode of one battery cell and a negative electrode of another battery cell to form a lap joint. Welds are formed in predetermined positions on the connecting metallic plate above the positive and negative electrodes by arc spot welding. The electrodes are formed of nickel-coated steel. The depth h of weld penetration in the weld is greater than the thickness T1 of the connecting metallic plate and smaller than the thickness T1 plus the thickness T2 of one of the electrodes, that is, T1

主权项

1. A battery pack comprising a plurality of battery cells and a connecting metallic plate connecting an electrode of one of the battery cells to an electrode of another one of the battery cells, wherein the connecting metallic plate is disposed on a positive electrode of the one of the battery cells and a negative electrode of said another one of the battery cells, and the connecting metallic plate and each of the positive and negative electrodes are fixed to each other to form a lap weld joint by an arc spot welding,
wherein the connecting metallic plate is comprised of copper, and each of the positive and negative electrodes is comprised of one of high carbon steel and low carbon steel, and is plated with nickel so that the connecting metallic plate and each of the positive and negative electrodes are fixed to each other by the arc spot welding through the nickel.