First of all, to be clear, EnerDel has not been selected to make the Volt’s battery pack. They are on our site because the government selected them as one of 5 companies to receive research funding (some of those dollars come from GM).
Today they made public the specs on the HEV (not PHEV) lithium-ion pack they recently revealed. This allows us some insight into what is needed for the Volt project.
The technical presentation is here: (LINK)
This entry was posted on Monday, October 29th, 2007 at 3:15 pm and is filed under Battery. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.
Oct 29th, 2007 (4:20 pm)Looks like the direct file link is: http://enerdel.com/pdfs/EnerDelTechnicalPresentation.pdf
Interesting, especially the nail tests. One thing that does concern me, but they qualify with a “data demonstrates further improvements capable”, is the cycle life (slide 39)– does that indicate that after about 600 cycles they’re only retaining 80%? I’d guess that’s full discharge/charge cycles. I’m curious how that might translate to the repeated partial discharge/charge that would happen with the ICE and regen braking.
Oct 29th, 2007 (4:26 pm)On a related note, is it normal for battery manufacturers to be so forthcoming with their data? I applaud EnerDel for doing so, as even though it’s not directly what we’d need to know for something like the Volt, it is helpful in understanding what they can get with their chemistry. Interesting stuff, indeed.
Oct 29th, 2007 (4:56 pm)MC-
The cycle life diagram you’re referring to was for their hard carbon anode, not the LTO anode that is in their HEV packs. The HC is higher energy, and probably intended for eventual PHEV use.
And yes, 80%capacity at 700 cycles, while using only 1C/1C charging/discharging, at 30 degrees C -> This is rather disappointing performance, but I guess that’s why they’re selling LTO first.
Oct 29th, 2007 (5:11 pm)They also did NOT reveal exact energy or power densities, so this isn’t full disclosure. A lot of the PDF is cut and paste from their website.
However, past info on this site has indicated that the pack holds 600Wh. At 23kg for the pack, that’s 26Wh/kg. Sounds horrible but it also takes into account the weight of all the packaging equipment – the metal box, the control circuitry, etc. The cells are also optimized for power, not energy.
It’s worth noting that Altair’s LTO HEV packs are in the low 30′s.
Oct 29th, 2007 (8:33 pm)Lyle,
I heard your latest interview with A123.
Can you also take a second interview with Compact power on the status ? It looks like both the technologies are promising.
Nov 6th, 2007 (10:52 am)looks good
Nov 6th, 2007 (11:12 am)test
Nov 6th, 2007 (11:14 am)OK looks like you can’t post hyper links
AES it looks as if the
Energy denisty is > 80k-h/kg
Source is page 82 of the Elecric Vehicle Battery test procedures manual at uscar.org
Seeing they passed phase 2 they would have to meet this criteria.
Nov 12th, 2007 (9:27 pm)Per EnerDel press release, the company has funding from both Dow Chemical and Delphi, formerly a GM subsidiary, working out of bankruptcy. They announced they’re planning to build a production facility in Indiana.