Patent ID: 8399116

Claim:
An electrochemical storage cell comprising: a coiled core comprising a cathode sheet, an anode sheet, and a separator sheet, wound to form a flattened coil structure having opposed flattened sides and opposed arcuate sides, wherein the anode sheet terminates only at an arcuate side and the cathode sheet terminates only at an opposite arcuate side, wherein the coiled core has a length Lcore and a width Wcore, and wherein the anode sheet and cathode sheet do not terminate along said respective flattened sides such that a thickness along the width of the coiled core is substantially free of dimensional variation, and the coiled core is free of wrinkles when subject to non-uniform applied forces; an anode connector connected with the anode sheet at a first end of the coiled core; a cathode connector connected with the cathode sheet at a second end of the coiled core opposite the first end; and wherein each of the cathode connector and anode connector has a width Wconnector, and wherein the length of the coiled core Lcore, the width of the coiled core Wcore, and the width of each connector Wconnector have the relationship 0<(Wcore−Wconnector)/Lcore<0.37.