Interconnect strip for an ultracapacitor module
A module comprises a first ultracapacitor having a first terminal, a second ultracapacitor having a second terminal, and an interconnect strip is provided. The interconnect strip contains a central section positioned between a first attachment section and a second attachment section. The first terminal of the first ultracapacitor is connected to the first attachment section of the strip and the second terminal of the second ultracapacitor is connected to the second attachment section of the strip. Further, the central section is formed from a flexible conductive material.
1 . A module comprising:
a first ultracapacitor having a first terminal;
a second ultracapacitor having a second terminal; and
an interconnect strip that contains a central section positioned between a first attachment section and a second attachment section wherein the thickness of the strip is from about 0.05 to 5 millimeters, the length of the strip is from about 60 to about 400 millimeters, and the width of the strip is from about 1 to about 20 millimeters,
wherein the first terminal of the first ultracapacitor is connected to the first attachment section of the strip and the second terminal of the second ultracapacitor is connected to the second attachment section of the strip, and further wherein the central section is formed from a flexible conductive material, wherein the flexible conductive material includes copper, tin, nickel, aluminum, or a combination thereof, and the central section is in the form of only one of wires, braids, coils, sheets, or bars and wherein the ratio of the length of the central section to the length of the strip is from greater than 0.75 to 0.85,
wherein the first attachment section defines a first opening through which the first terminal is received and the second attachment section defines a second opening through which the second terminal is received, wherein a fastening device connects the first attachment section to the first terminal and the second attachment section to the second terminal, further wherein the first attachment section is welded to the first terminal and the second attachment section is welded to the second terminal.
2 . The module of claim 1 , wherein the flexible conductive material is in the form of only one of wires, coils, sheets, or bars.
3 . The module of claim 1 , wherein the flexible conductive material is only in the form of braids.
4 . The module of claim 1 , wherein the flexible conductive material includes only one of copper, tin, nickel, or aluminum.
5 . The module of claim 1 , wherein the ratio of the length of the central section to the length of the strip is from greater than 0.75 to less than 0.85.
6 . The module of claim 5 , wherein the length of the central section is from about 50 to about 300 millimeters.
7 . The module of claim 1 , wherein the width of the strip is from about 10 to about 20 millimeters.
8 . The module of claim 1 , wherein the thickness of the strip is from about 0.5 to 5 millimeters.
9 . The module of claim 1 , wherein the first terminal and the second terminal have an opposite polarity.
10 . The module of claim 1 , wherein the module contains from 8 to 30 ultracapacitors.
11 . The module of claim 1 , wherein each of the ultracapacitors comprises:
an electrode assembly comprising a first electrode, a second electrode, and a separator positioned between the first and second electrodes;
a nonaqueous electrolyte that is in ionic contact with the first electrode and the second electrode; and
a housing within which the electrode assembly and the electrolyte are contained.
12 . The module of claim 11 , wherein the first electrode comprises a first current collector electrically coupled to a first carbonaceous coating and the second electrode comprises a second current collector electrically coupled to a second carbonaceous coating.
13 . The module of claim 12 , wherein the first current collector and the second current collector each contain a substrate that includes a conductive metal.
14 . The module of claim 13 , wherein the conductive metal is aluminum or an alloy thereof.
15 . The module of claim 12 , wherein the first carbonaceous coating, the second carbonaceous coating, or both contain activated carbon particles.
16 . The module of claim 11 , wherein the separator includes a cellulosic fibrous material.
17 . The module of claim 11 , wherein the electrode assembly has a jellyroll configuration.
18 . The module of claim 11 , wherein the nonaqueous electrolyte contains an ionic liquid that is dissolved in a nonaqueous solvent, wherein the ionic liquid contains a cationic species and a counterion.
19 . The module of claim 18 , wherein the nonaqueous solvent includes propylene carbonate, a nitrile, or a combination thereof.
20 . The module of claim 11 , wherein the cationic species includes an organoquaternary ammonium compound.
21 . The module of claim 11 , wherein the housing includes a container having a base and an open end, wherein a lid is disposed adjacent to the open end, and further wherein the electrode assembly is positioned within the housing.
22 . The module of claim 21 , wherein the container is formed from a metal.
23 . The module of claim 21 , wherein the container has a cylindrical shape.