ANODE-FREE CELL WITH CONTINUOUS STACKING FOLD
An anode-free cell including a housing and a plurality of cathode layers each cathode layer includes a cathode current collector disposed between two cathode active material layers. The anode-free cell also includes a pair of separators, and an anode current collector laminated in between the pair of separators to form a continuous laminated separator-current collector-separator layer. The continuous laminated separator-current collector-separator layer is positioned in between adjacent cathode layers of the plurality of cathode layers in a continuous stacking fold.
1 . An anode-free cell comprising:
a housing having a width along a first axis (X-axis), a length along a second axis (Y-axis) orthogonal to the first axis, and a thickness along a third axis (Z-axis) orthogonal to the first and second axes;
a plurality of cathode layers, each cathode layer of the plurality of cathode layers comprising a cathode current collector disposed between two cathode active material layers;
a pair of separators; and
an anode current collector laminated between the pair of separators to form a continuous laminated separator-current collector-separator layer,
wherein the continuous laminated separator-current collector-separator layer is disposed between adjacent cathode layers of the plurality of cathode layers in a continuous stacking fold.
2 . The anode-free cell of claim 1 , wherein the anode current collector is a copper foil.
3 . The anode-free cell of claim 1 , wherein the pair of separators are coated with a first material.
4 . The anode-free cell of claim 3 , wherein the first material is a ceramic.
5 . The anode-free cell of claim 1 , wherein a thickness of the anode current collector is 4-10 μm.
6 . The anode-free cell of claim 1 , wherein:
the continuous stacking fold comprises a plurality of contiguous sections;
each of a number of the plurality of contiguous sections are disposed between two adjacent cathode layers.
7 . The anode-free cell of claim 6 , wherein the plurality of contiguous sections comprises at least 3 contiguous sections.
8 . The anode-free cell of claim 7 , wherein the plurality of contiguous sections comprises at least 5 contiguous sections.
9 . The anode-free cell of claim 1 , further comprising an adhesive coating between the anode current collectors and the pair of separators.
10 . The anode-free cell of claim 1 , wherein the continuous laminated separator-current collector-separator layer comprises a plurality of tabs.
11 . A method of manufacturing an anode free cell comprising:
providing a housing for the anode free sell, the housing having a width along a first axis (X-axis), a length along a second axis (Y-axis) orthogonal to the first axis, and a thickness along a third axis (Z-axis) orthogonal to the first and second axes;
for each cathode layer of a plurality of cathode layers, disposing a cathode current collector between two cathode active material layers;
laminating an anode current collector between a pair of separators to form a continuous laminated separator-current collector-separator layer; and
disposing the continuous laminated separator-current collector-separator layer in between adjacent cathodes layers of the plurality of cathode layers to form a continuous stacking fold.
12 . The method of claim 11 , wherein the laminating is performed in a continuous roll-to-roll lamination process.
13 . The method of claim 12 , wherein a single sheet of continuous laminated separator-current collector-separator layer is used for the cell by cutting the continuous laminated separator-current collector-separator layer once in the continuous roll-to-roll lamination process.
14 . The method of claim 11 , further comprising:
generating a plurality of tabs on the anode current collector prior to the laminating.
15 . The method of claim 11 , wherein the plurality of tabs are generated by laser notching.
16 . The method of claim 11 , further comprising:
pre-coating the anode current collector to increase adhesion of the pair of separators to the anode current collector upon the laminating.
17 . The method of claim 11 , wherein the disposing the continuous laminated separator-current collector-separator layer in between adjacent cathode layers comprises dimensioning a bend forming finger and a clearance between the cathode layer and a corresponding edge of the continuous laminated separator-current collector-separator layer such that the bend forming finger placed in the clearance forms a natural bend.
18 . The method of claim 17 , wherein a radius of the bend forming finger is 0.2-1 mm.
19 . The method of claim 17 , wherein a distance between the cathode layer and a far end of the continuous laminated separator-current collector-separator layer in the X-axis is from 0.5 mm to 2 mm.
20 . The method of claim 17 , wherein the natural bend is crack-free and delamination-free.