8 years or UNLIMITED miles as of last week - retroactive and transferrable, too! MW
On 20 Aug 2014, at 02:50, Dennis Miles via EV wrote: > Peri, Watch the video, You Tube title is: " eSamba EP 29 TESLA style > fuses " The many parallel packs in series depend upon each pack not having > multiple failures, one or two in each pack are no problem there are about > 50 cells in each parallel group. If a catastrophic failure should happen > and a cascade of the cell fuses blow, the car just stops and you get the > battery pack replaced under warranty the first 8 years or 100,000 miles. > (in a TESLA) > > Dennis Lee Miles > > (*evprofes...@evprofessor.com <evprofes...@evprofessor.com>)* > > * Founder: **EV Tech. Institute Inc.* > > *Phone #* *(863) 944-9913 (12 noon to 12 midnight Eastern US Time)* > > *Educating yourself, does not mean you were **stupid; it means, you are > intelligent enough, **to know, that there is plenty left to learn!* > > * You Tube Video link: http://youtu.be/T-FVjMRVLss > <http://youtu.be/T-FVjMRVLss> * > > * NEW You Tube Video link: *http://youtu. be/Pz9-TZtySh8 > <http://youtu.%20be/Pz9-TZtySh8> > > > On Tue, Aug 19, 2014 at 9:12 PM, Peri Hartman via EV <ev@lists.evdl.org> > wrote: > >> So, if you want individual fusible cells, then a bus bar on both terminals >> won't work. One side can be spot welded but the other side needs the fuse >> wire - or something. Not sure how that could be done in this model. Does >> Tesla really have each cell fused? >> >> Part of my idea is to make each module easy to connect and swap out, if >> needed. Also easy to pack into a tray. >> >> >> Peri >> >> ------ Original Message ------ >> From: "Dennis Miles via EV" <ev@lists.evdl.org> >> To: "Lee Hart" <leeah...@earthlink.net>; "Electric Vehicle Discussion >> List" <ev@lists.evdl.org> >> Sent: 19-Aug-14 5:29:00 PM >> Subject: Re: [EVDL] CALB bolt terminals getting hot - >> >> The cells in the TESLA pack are a group in parallel then the parallel >>> groups are wired in series for the desired voltage, The key to pack >>> survival when a cell fails is a fusible link (Correctly sized short length >>> of wire) in series with each and every cell then any malfunctioning cell >>> is >>> isolated when the link opens. (Reducing pack capacity about 2%.) >>> >>> Dennis Lee Miles >>> >>> (*evprofes...@evprofessor.com <evprofes...@evprofessor.com>)* >>> >>> * Founder: **EV Tech. Institute Inc.* >>> >>> *Phone #* *(863) 944-9913 (12 noon to 12 midnight Eastern US Time)* >>> >>> *Educating yourself, does not mean you were **stupid; it means, you are >>> intelligent enough, **to know, that there is plenty left to learn!* >>> >>> * You Tube Video link: http://youtu.be/T-FVjMRVLss >>> <http://youtu.be/T-FVjMRVLss> * >>> >>> * NEW You Tube Video link: *http://youtu. be/Pz9-TZtySh8 >>> <http://youtu.%20be/Pz9-TZtySh8> >>> >>> >>> On Tue, Aug 19, 2014 at 7:32 PM, Lee Hart via EV <ev@lists.evdl.org> >>> wrote: >>> >>> Peri Hartman via EV wrote: >>>> >>>> To take this to a traction pack, I would want to try a similar design >>>>> where strings of cells are spot welded in parallel for the desired >>>>> current load. As I understand it, you can put as many in parallel as >>>>> you >>>>> want and control them with a single BMS unit. >>>>> >>>>> >>>> Well... There are those that believe this, and it is certainly done. >>>> >>>> However, think about failure modes: Sooner or later, a cell will fail. >>>> What happens if one of the cells in parallel shorts? All the rest will >>>> dump >>>> all their stored energy into that one shorted cell. That is very likely >>>> to >>>> result in a burst cell or even a fire. And packed like this, once one >>>> cell >>>> starts burning, it can set the rest on fire. >>>> >>>> When laptop manufacturers connected their cells directly in parallel, >>>> there were some dramatic failures and fires. Since then, reputable >>>> manufacturers are using cells with *internal* fuses and safety devices. >>>> Hobbyists and el-cheapo manufacturers aren't likely to use such cells. >>>> >>>> -- >>>> The principal defect in a storage battery is its modesty. It does not >>>> spark, creak, groan, nor slow down under overload. It does not rotate. >>>> It works where it is, and will silently work up to the point of >>>> destruction without making any audible or visible signs of distress. >>>> -- Electrical Review, 1902 >>>> -- >>>> Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm >>>> >>>> _______________________________________________ >>>> 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) >>>> >>>> >>>> -------------- next part -------------- >>> An HTML attachment was scrubbed... >>> URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/ >>> attachments/20140819/de521326/attachment.htm> >>> >>> _______________________________________________ >>> 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) >> >> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140819/bf53b19d/attachment.htm> > _______________________________________________ > 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)
