A battery pack configured to receive an array of electrochemical cells , the battery pack comprising a battery pack housing , the array of electrochemical cells being disposed within the battery pack housing , each cell comprising a cell housing formed of a metal film laminate material, each cell housing being a rectangular polygon, an electrode assembly disposed in the cell housing , an electrically conductive cell positive terminal disposed on an outside of the cell housing , the cell positive terminal being electrically connected to a positive electrode of the electrode assembly , an electrically conductive cell negative terminal disposed on an outside of the cell housing , the cell negative terminal being electrically connected to a negative electrode of the electrode assembly , wherein one of the positive terminal and negative terminal overlies three sides of the cell housing , and the other of the positive terminal and the negative terminal overlies one side of the cell housing , where the one side is different from, and shares a circumference with, the three sides, and wherein the cells are arranged within the battery pack housing such that the cell positive terminal of at least one cell faces the cell negative terminal of an adjacent cell, and a force generating assembly (40; 140) disposed in the battery pack housing , the force generating assembly (40; 140) configured to apply a first force to the array of electrochemical cells along a first direction and a second force to the array of electrochemical cells along a second direction, where the second direction is orthogonal to the first direction, wherein the force generating assembly (40; 140) is disposed between at least one of the cells and the cell housing so as to urge the cells of the array into direct contact in such a way that the cell positive terminal of at the least one cell directly contacts, and forms an electrical connection with, the cell negative terminal of the adjacent cell. a cell housing formed of a metal film laminate material, each cell housing being a rectangular polygon, an electrode assembly disposed in the cell housing , an electrically conductive cell positive terminal disposed on an outside of the cell housing , the cell positive terminal being electrically connected to a positive electrode of the electrode assembly , an electrically conductive cell negative terminal disposed on an outside of the cell housing , the cell negative terminal being electrically connected to a negative electrode of the electrode assembly , wherein one of the positive terminal and negative terminal overlies three sides of the cell housing , and the other of the positive terminal and the negative terminal overlies one side of the cell housing , where the one side is different from, and shares a circumference with, the three sides, and wherein the cells are arranged within the battery pack housing such that the cell positive terminal of at least one cell faces the cell negative terminal of an adjacent cell, and a force generating assembly (40; 140) disposed in the battery pack housing , the force generating assembly (40; 140) configured to apply a first force to the array of electrochemical cells along a first direction and a second force to the array of electrochemical cells along a second direction, where the second direction is orthogonal to the first direction, wherein the force generating assembly (40; 140) is disposed between at least one of the cells and the cell housing so as to urge the cells of the array into direct contact in such a way that the cell positive terminal of at the least one cell directly contacts, and forms an electrical connection with, the cell negative terminal of the adjacent cell. <EOS>