lumberjack_jeff
Sat 26 July 2008, 23:40
http://www.sunstoneengineering.com/site/pages/dp2007datasheet
I'm researching the build process of converting cars to electric power. This is most commonly done with lead-acid golf-cart batteries of 6v. The massive weight of these units poses a big performance challenge.
Because of these performance drawbacks, builders are increasingly creating packs from LiFePO4 cells (http://www.alibaba.com/product-gs/204209271/38120_10Ah_LiFePO4_lithium_ion_battery.html). A comparable pack will occupy 1/4 of the space, can be packed into nooks and crannies that lead acid batteries will not fit, and will weigh 50%-70% less.
The downside (aside from their greater cost - about 5x that of lead-acid) is that it takes 1000 of these cells (about twice the size of a "D" size battery) to create the average pack, each of which needs to be spot-welded together, like a bigger cordless phone battery pack. Eight separate welds for each cell.
You see where I'm going with this.
It'd be cool to set the cells in a fixture, place the tabs in the appropriate places, index the welding electrode to the proper starting position, and stand back and let a machine make the 8000, repeatable and uniform spot welds.
I'm researching the build process of converting cars to electric power. This is most commonly done with lead-acid golf-cart batteries of 6v. The massive weight of these units poses a big performance challenge.
Because of these performance drawbacks, builders are increasingly creating packs from LiFePO4 cells (http://www.alibaba.com/product-gs/204209271/38120_10Ah_LiFePO4_lithium_ion_battery.html). A comparable pack will occupy 1/4 of the space, can be packed into nooks and crannies that lead acid batteries will not fit, and will weigh 50%-70% less.
The downside (aside from their greater cost - about 5x that of lead-acid) is that it takes 1000 of these cells (about twice the size of a "D" size battery) to create the average pack, each of which needs to be spot-welded together, like a bigger cordless phone battery pack. Eight separate welds for each cell.
You see where I'm going with this.
It'd be cool to set the cells in a fixture, place the tabs in the appropriate places, index the welding electrode to the proper starting position, and stand back and let a machine make the 8000, repeatable and uniform spot welds.