On Wed, Aug 8, 2018 at 6:38 AM David Nelson via EV <ev@lists.evdl.org> wrote:
> On Mon, Aug 6, 2018 at 7:51 PM, Alan Arrison via EV <ev@lists.evdl.org> > wrote: > > I guarantee that the inferior Chinese cells will change capacity as they > are > > cycled and not by just a few percent. > > > > Running them without a BMS is a recipe for disaster. Damaged cells at > best, > > a fire at worst. > > > > All the Chinese cells are junk, especially the CALBS. > > > > Al > > I'm so glad my cells didn't talk to you! Manufactured 11/2009, > installed and on the road 1/2010. No attached BMS other than split > pack voltage monitor since 7/2011 and all 40 cells are doing just fine > when checked in 3/2018. End of charge voltage 3.465V held for 45 min > during the CV stage with current tapering to 0A. > > Clearly your abslolute about Chinese cells doesn't fit. Sorry you had > a bad experience. > > > I have a lot of miles on CALBs too, probably 100k in total on personal vehicles. One still in use with 50k miles and no BMS. I dismantled a car with a CALB pack recently too - somewhere around 9 year old cells, they still had 90% of rated capacity. I also sent around half a ton of CALB cells to be analysed / recycled by a university research team. Those had been run dead flat by a badly designed BMS in a commercial conversion. They're rather low power density but in my experience very reliable and will last a long time if not abused. YMMV! -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210820/c3cbdd41/attachment.html> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
