| CPC H01M 10/0431 (2013.01) [H01M 10/0413 (2013.01); H01M 50/184 (2021.01)] | 34 Claims |
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1. An electrochemical device comprising:
a positive electrode strip, a negative electrode strip, and a separator layer spirally wound in a roll around a central axis in which said separator layer is disposed to prevent direct contact between said positive electrode strip and said negative electrode strip, wherein said positive electrode strip and said negative electrode strip each have a length with a first edge and a second edge opposing the first edge along said length in said roll;
a housing having a top wall and a bottom wall;
said top wall having a first planar surface perpendicular to said central axis;
a first plate member and a second plate member within said housing, said first plate member having a second planar surface perpendicular to said central axis, said second planar surface facing said first planar surface with said roll disposed therebetween, and said first plate member being disposed between said roll and said second plate member;
said separator layer being of a zig zag shape to provide a first fold portion supporting said positive electrode strip and the second edge thereof and a second fold portion supporting said negative electrode strip and the second edge thereof, in which, along said roll, a portion of each of said positive electrode strip and said negative electrode strip exits from said first fold portion and said second fold portion, respectively, beyond said separator layer in one of two opposite directions generally parallel with said central axis to dispose said first edge of said positive electrode strip and said first edge of negative electrode strip to each face a different one of said first planar surface and said second planar surface, wherein the first edge which faces said second planar surface represents a face of said roll; and
said second plate member provides a plurality of spring elements each being a prong cut from material of said second plate member and extending from said second plate, bent at an angle with respect to said second plate member, to form a foot disposed against said bottom wall, said spring elements being compressible with respect to said bottom wall to enable said second plate member, via said first plate member, to apply substantially uniform pressure across said face of said roll toward said first planar surface in order to position said first edge of said positive electrode strip and said first edge of said negative electrode strip in contact against their respective facing of said different ones of said first planar surface and said second planar surface to provide one or more of reduced electrical and thermal resistance.
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