Two interesting videos showing the disassembly of the B olt EV battery pack by Professor John D. Kelly at Weber State University (WSU).https://www.youtube.com/watch?v=N3G8JGsEjPAhttps://www.youtube.com/watch?v=ssU2mjiNi_Q
This is the sticker seen on the B olt EV battery from the first YouTube video above
In the second YouTube video above we see that the B olt's pack is made up of eight 5.94 kWh modules and two 4.75 kWh modules for a total capacity of 57.02 kWh. Presumably that means eight modules with ten cells and two modules with eight. Each of the 96 cells would have a capacity of 594Wh. We don't know if that number is total capacity or the usable capacity or even perhaps a nominal rating.
There has been discussion on this both at the N issan Leaf site and at the T esla sitehttp://mynissanleaf.com/viewtopic.php?f=10&t=18907&start=1850#p519226Chevy Bolt - 200 mile range for $30k base price (after incentive)
Previously on this thread I had noted -
1/ The 2017 B olt battery pack is 60 kWh and weighs 435kg -> Gravimetric Energy Density = 138 Wh/kg
2/ The I oniq EV battery pack is 31 kWh and weighs 271.8kg -> Gravimetric Energy Density = 114 Wh/kg
I have now realised why GM for the B olt has chosen a more energy dense battery cell than Hyundai. (or GM for the V olt)
From a comment by Jeff N on the T esla Forum
Jeff N wrote: ...it’s more about cell construction than cell chemistry. They optimized the thickness of the cathode, anode, and conductive copper and aluminum collector foils in the Bolt cells to get the highest energy density whereas in the Volt they aimed to enable higher power capability.
The cell specifications, such as we know them from unofficial sources, are quite different. The Bolt cells may be max 2C continuous discharge with a 10 second peak discharge rate of 3.5C whereas the Volt cells may have been rated for 10C continuous discharge. In return for that lower design power, Bolt cells appear to be quite a bit more energy dense.
The cell chemistry in the B olt means the fast charging will be slower and taper earlier. But it has higher energy density = a bigger battery in the same space.
There's an interesting article by Jeff N here comparing the battery cells in the Jaguar I-Pace and the B olt EV . - Jaguar and Chevy have LG in common
Interesting to see that the Jaguar I-Pace also seems to have favoured a cell chemistry that allows greater power as opposed to the Bolt EV that seems to favour greater energy density.
This battery cell is the one used in the Chevy B olt EV. - see Inside the factory building GM's game-changing Bolt EV
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