OFF-AXIS AND OFF-PLANE COMPLIANT BUSBAR
A busbar that includes a body having a first end corresponding to a first terminal contact area of the busbar, a second end opposite the first end, corresponding to a second terminal contact area of the busbar, and a spring-like middle portion located between the first end.
1 . A busbar comprising:
a body comprising a first end corresponding to a first terminal contact area of the busbar, a second end opposite the first end, corresponding to a second terminal contact area of the busbar, and a spring-like middle portion disposed between the first end and the second end; the spring-like middle portion having:
at least one bend configured as a depression and/or an elevation; and
at least one slit disposed transversely in the spring-like middle portion across the at least one bend;
wherein said at least one bend and at least one slit provide the spring-like middle portion with a spring-like characteristic that allows off-axis compliance of a center of the first terminal contact area relative to a center of the second terminal contact area and/or off-plane compliance of a surface of the first terminal contact area relative to a surface of the second terminal contact area.
2 . The busbar of claim 1 , wherein the at least one bend is configured as a depression and has a depressed profile relative to a profile of the first or second ends.
3 . The busbar of claim 2 , wherein the at least one bend comprises two or more bends.
4 . The busbar of claim 3 , wherein the at least one bend comprises three bends.
5 . The busbar of claim 1 , wherein the at least one bend is configured as an elevation and has an elevated profile relative to a profile of the first or second ends.
6 . The busbar of claim 5 , wherein the at least one bend comprises two or more bends.
7 . The busbar of claim 6 , wherein the at least one bend comprises three bends.
8 . The busbar of claim 1 , wherein the at least one bend of the spring-like middle portion comprises at least one elevation and at least one depression, and
wherein each elevation is disposed adjacent to a depression to provide the spring-like middle portion with a sinusoidal shape centered about a profile of the first or second ends.
9 . The busbar of claim 8 , wherein the spring-like middle portion comprises at least two elevations and at least two depressions.
10 . The busbar of claim 1 , wherein the spring-like middle portion comprises at least 2 slits.
11 . The busbar of claim 1 , wherein the number of slits is a factor of a thickness or cross-sectional area of the busbar.
12 . The busbar of claim 11 , wherein the body comprises a defined cross-sectional area of about 50 mm 2 configured to maintain a defined current carrying capacity of about 250 A.
13 . The busbar of claim 1 , wherein the number of slits is a factor of a width of the busbar.
14 . The busbar of claim 13 , wherein the spring-like middle portion comprises at least 7 slits per each 40 mm of width of the busbar.
15 . The busbar of claim 1 , wherein the spring-like middle portion is configured such that an air gap between the first terminal contact area and a corresponding terminal of a first cell that is brought into contact with said first terminal contact area under pressure is eliminated or substantially eliminated, and
wherein another an air gap between the second terminal contact area and a corresponding terminal of a second cell that is brought into contact with said second terminal contact area under pressure, prior to welding, is eliminated or substantially eliminated.
16 . The busbar of claim 1 , wherein said body comprises aluminum or copper.
17 . The busbar of claim 1 , wherein the at least one slits does not proceed past the first or second terminal contact areas.
18 . The busbar of claim 1 , further comprising:
a plurality of spring-like middle portions and a one or more other terminal contact areas disposed between the first terminal contact area and the second terminal contact area.
19 . The busbar of claim 1 , wherein the other terminal contact areas have a profile that matches or substantially matches the profile of the first terminal contact area or second terminal contact area.
20 . The busbar of claim 1 , wherein the at least one bend has a radius of curvature of between 90 and 270 degrees relative to the X-axis.
21 . A method comprising:
providing a busbar body comprising a first end corresponding to a first terminal contact area of the busbar, and a second end opposite the first end, corresponding to a second terminal contact area of the busbar,
producing a spring-like middle portion of the busbar in a middle of the busbar, said spring-like middle portion being disposed between the first end and the second end by:
creating, at least one bend configured as a depression and/or an elevation in said middle; and
creating at least one slit, using a first laser device, transversely in the spring-like middle portion across the at least one bend such that said at least one bend and at least one slit provide the spring-like middle portion with spring-like characteristic that allows off-axis compliance of a center of the first terminal contact area relative to a center of the second terminal contact area and/or off-plane compliance of a surface of the first terminal contact area relative to a surface of the second terminal contact area.
22 . The method of claim 21 , further comprising:
welding or bonding, the first terminal contact area to a terminal of a corresponding first cell and the second terminal contact area to a terminal of a corresponding second cell with no air gaps or substantially no air gaps between the first terminal contact area and the terminal of the corresponding first cell, and between the second terminal contact area and the terminal of the corresponding second cell, when brought together under external pressure prior to said welding or bonding.