Paul, I presume you never ride in a car, because Ford's Pinto was a bomb on wheels and unsafe at any speed.
Your line of reasoning does not warrant a serious response and I have given many reasons why a BMS is a good thing - I like to discuss based on arguments and data, not on lore and incidents. BTW, last I heard the root cause of the dreamliner fires is still unknown, there is suspicion about the quality of the batteries, similar to what caused laptop batteries to catch fire due to impurities embedded in the cells and trigger thermal runaway. I have helped to investigate a fire in a converted EV with Lithium-Ion prismatic cells that I suspect (but it was never conclusively proven) was caused by manufacturing defects. There was no BMS on that pack and it was not being charged, still it caught fire just sitting. One thing that I found was that what appeared to be a hotspot also showed severely deformed (folded crooked as if they were rammed into the prismatic case) cell plates (the original pouches that are contained in a bundle inside the prismatic cell) in one of the cells. But you can't say "they used a BMS so that caused the fire". If you have a source that proves that it was in fact the BMS causing the fire then I would be interested in a link. Here is what I have: http://arstechnica.com/business/2013/02/investigation-reveals-cause-of-battery-fire-on-boeing-787-dreamliner/ https://en.wikipedia.org/wiki/Boeing_787_Dreamliner_battery_problems http://www.ifsecglobal.com/dreamliner-lithium-battery-fire-cause-still-unknown/ Regards, Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Paul Dove via EV Sent: Thursday, June 18, 2015 6:31 PM To: EVDL Administrator; Electric Vehicle Discussion List Subject: Re: [EVDL] Bicycle battery Even Boeing burned up dream liners with a BMS. Got any other argument besides everyone is doing it? Sent from my iPad > On Jun 18, 2015, at 2:02 PM, EVDL Administrator via EV <[email protected]> > wrote: > >> On 18 Jun 2015 at 11:43, Cor van de Water via EV wrote: >> >> That pack is very nicely top-balanced and I expect that many more >> BMSs that you are not even aware of in daily appliances such as power >> tools will all top-balance. > > One more time. There is a really good reason that the only place you > find aversion to BMSes is among EV hobbyists. > > Real world electronics manufacturers -- the ones who build millions of > laptops, mobile phones, power tools and yes, commercial EVs -- know > that you don't sell a product with a lithium battery unless it has > ample smarts to protect the battery, the user, and the manufacturer. > > Trust me, these guys have bean counters looking over their shoulders. > They wouldn't be using BMSes if they weren't necessary. BMSes protect > the battery from early failure, the user from hazard to life and limb, > and the manufacturer from the lawyers! > > David Roden - Akron, Ohio, USA > EVDL Administrator > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL > Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = > = = = = = = = = = = = = = > Note: mail sent to "evpost" and "etpost" addresses will not reach me. > To send a private message, please obtain my email address from the > webpage http://www.evdl.org/help/ . > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
