Constraints for energy storage devices
An energy storage device, the energy storage device including a constraint that maintains a pressure on a unit cell configured for energy storage, e.g., during use of the unit cell.
1 . A device for energy storage, the device comprising:
a unit cell comprising an electrode separated from a counter-electrode and stacked along an axis; and
a constraint comprising a tension member having two opposing sides, the tension member being planar, each side being coupled with a compression member of compression members, each compression member being disposed normal to the tension member, the constraint being configured to maintain a pressure in the unit cell (a) during use of the device and (b) along the axis such that the pressure exceeds other pressure on the unit cell in each of two axes that are (i) mutually perpendicular to each other and (ii) perpendicular to the axis, the constraint being operatively coupled with the unit cell.
2 . The device of claim 1 , wherein the tension member is configured to pull the compression members toward each other and thereby apply a compressive force to opposing end surfaces of the unit cell to inhibit expansion of the unit cell along the axis, the opposing end surfaces being disposed along the axis.
3 . The device of claim 1 , wherein the constraint comprises elemental metals, metal alloys, ceramics, glass, polymers, a composite, or another combination thereof.
4 . The device of claim 1 , wherein the constraint comprises a material having an ultimate tensile strength of at least 10,000 pounds per square inch (PSI), does not significantly corrode at a floating or electrode potential for the unit cell, does not significantly react at 45 degrees Celsius (° C.), does not significantly lose mechanical strength at 45° C., or any combination thereof.
5 . The device of claim 1 , wherein the constraint is a first constraint, and wherein the device comprises a second constraint similar to the first constraint, the second constraint opposing the first constraint, the first constraint and the second constraint configured to couple with the unit cell disposed therebetween.
6 . The device of claim 1 , wherein the electrode comprises electrode active material coupled with about two opposing sides of an electrode current collector.
7 . The device of claim 1 , wherein the device comprises an enclosure sealing the unit cell and the constraint, the seal configured for liquid sealing.
8 . The device of claim 1 , wherein the electrode comprises an electrode active material comprising silicon, an oxide thereof, porous silicon, or an alloy thereof.
9 . The device of claim 1 , wherein the electrode comprises an electrode active material comprising nanowires.
10 . The device of claim 1 , wherein the constraint comprises a sheet of material having a thickness in a range of about 10 to about 100 micrometers.
11 . The device of claim 1 , wherein the constraint comprises welding, glue, or any combination thereof.
12 . The device of claim 1 , wherein the device comprises a secondary battery comprising the unit cell and the constraint.
13 . The device of claim 1 , wherein the constraint comprises slots.
14 . The device of claim 13 , wherein (a) each of the slots comprises a curvature, (b) the slots are aligned with respect to each other, (c) the slots are arranged equidistant from each other in a sequence, (d) each of the slots is elongated, or (e) any combination thereof.
15 . The device of claim 1 , wherein the unit cell comprises a separator surrounding the electrode and surrounding the counter-electrode, the separator being electrically insulating.
16 . The device of claim 15 , wherein the separator comprises a microporous material, a ceramic, or a polymer, or any combination thereof.
17 . The device of claim 1 , wherein the unit cell is configured for repeated cycling between charged and discharged states including cycling at least 2, 5, 10, 25, 50, 100, 300, 500, or 1000 times from a discharged to a charged state.
18 . The device of claim 1 , wherein the device comprises at least 2, 4, 5, 10, 25, 50, or 100 unit cells similar to the unit cell and comprising the unit cell, and wherein (A) device comprises unit cells similar to and including the unit cell, the unit cells being stacked along the axis, the unit cells forming a stacked arrangement and/or (B) the electrode and counter-electrode of each of the unit cells in the stacked arrangement, are disposed in an alternating sequence.
19 . The device of claim 1 , wherein: (i) a length of the electrode and of the counter-electrode in each of the unit cells, is from 5 mm to 500 mm, a width of the electrode and the counter-electrode in each of the unit cells, is from 0.01 mm to 2.5 mm, and a height of the electrode and of the counter-electrode in each of the unit cells, is from 0.05 mm to 10 mm, and/or (ii) the electrode and of the counter-electrode of each of the unit cells, has (a) a length to a width of at least 5:1 or higher, (b) a length to a height of at least 5:1 or higher, and/or (c) the height to the width of at least 0.4:1, and/or (iii) a cross-section of the electrode and of the counter-electrode of each of the unit cells, has a length to a perimeter ratio of at least 1.25:1 or a higher length to a perimeter ratio.
20 . A method of the energy storage, the method comprising: (A) providing the device of claim 1 , and performing one or more operations associated with the energy storage comprising (a) forming the device, or (b) using the device and/or (B) manufacturing the device of claim 1 for use in the energy storage.