How much extra energy does it require? 1%? 10%? 0.01%? - Mark
Sent from my Fuel Cell powered iPhone > On Sep 24, 2020, at 5:33 PM, Alan Arrison via EV <ev@lists.evdl.org> wrote: > > Sheesh, nothing like over-hyping. They conveniently don't mention any > downside like extra energy needed for the wireless communication or possible > interference to said communication. > > >> On 9/24/2020 9:49 AM, moskowitz via EV wrote: >> https://www.designnews.com/automotive-engineering/general-motors-slashes-battery-wiring-90-percent >> >> --- >> >> General Motors Slashes Battery Wiring by 90 Percent >> >> [Dan Carney](https://www.designnews.com/author/Dan-Carney)| Sep 10, 2020 >> >> As[General Motors >> Co](https://www.designnews.com/electronics-test/general-motors-sees-future-zero-crashes-zero-emissions-zero-congestion). >> gets closer to the[production launch of electric >> vehicles](https://www.designnews.com/automotive-engineering/cadillac-lyriq-reveals-new-details-gms-ultium-battery-technology)employing >> the company’s[next-generation Ultium >> batteries](https://www.designnews.com/automotive-engineering/cadillac-lyriq-reveals-new-details-gms-ultium-battery-technology), >> it is revealing additional technical details about these upcoming batteries. >> >> The latest revelation is GM’s partnership with Analog Devices, Inc., to >> incorporate a wireless battery management system into the Ultium battery >> packs. This solution not only eliminates 90 percent of the wiring in the >> packs, it also provides for increased efficiency and flexibility of those >> packs. >> >> Additionally, because eliminating wires in packs leaves more space inside >> for additional cells, it can create additional driving range. An important >> factor is that not only does the wiring occupy space, but its installation >> and connection is a manual process, and there has to be space provided for >> workers to do the installation, pointed out Analog Devices technical >> director for automotive, Gina Aquilano. “Thereis manual assembly where you >> have to leave room for someone to go in and make the connections,” she said. >> >> The ability to install additional cells in the same size battery pack is an >> example of “a tangible outcome for the end-user,” of the use of wireless >> management technology, Aquilano continued. >> >> Range also benefits because the wireless management system can better >> optimize the usage of individual cells, which also increases driving range. >> “Your pack is only as good as your weakest battery,” she observed. “This >> allows testing cells in more of an automated way for better matching.” >> >> This monitoring is done by more accurate sensors, which not only aids in >> managing Ultium’s Nickel-Cobalt-Manganese-Aluminum cells but will provide >> the precision necessary for the future, even more, finicky chemistries such >> as lithium iron phosphate, Aquilano added. “Having the sensors you need for >> more sustainable battery chemistries is important,” she said. >> >> As GM has described previously, having the intelligence built into each pack >> means that not only can future chemistries be managed using this same >> technology, but that those future packs will be backward compatible with >> today’s technology. That will let Ultium-powered EVs swap in more advanced >> batteries later if they need a battery replacement at some time in their >> lives. >> >> This modularity lets the packs be connected in series or parallel, in >> whatever number the application requires, from six to twenty-four packs, >> explained GM’s director for global battery cells and electrification, Tim >> Grewe. “That’s what this wireless tech enables,” he said. “You can do any >> voltage or parallel combination you want to do. There is no practical >> limitation on how many you can put in series or parallel.” >> >> The elimination of wiring from the management circuitry has another >> advantage: it isn’t subject to wiring failures. “One of the huge benefits is >> the fault management,” Grew explained. “On wired systems, a hard short is a >> big problem. A wireless system will reconfigure so it gets information from >> the unaffected nodes in the pack.” >> >> But doesn’t wired communication provide resistance to electromagnetic >> interference? “There’s a lot of [electromagnetic] noise out there,” Grewe >> acknowledged. “It jumps over to a frequency that doesn’t have the noise.” >> >> When Analog Devices proposed its wireless technology as a potential solution >> for GM, “we were very inquisitive about those same questions,” he recalled. >> “The nature of it is that you can switch frequencies,” Grewe said. “It >> provides avoidance capabilities that were surprising to me. It will just >> jump to a channel where the interference doesn’t exist.” >> >> Just as importantly, the system documents its adjustments, providing >> engineers a better understanding of the system’s performance. “It also gives >> you the reports along the way to say what happened,” he said. “It has really >> got a lot of capabilities that are fully validated per GM standards.” >> >> It was these capabilities in its SmartMesh IP wireless network products for >> industrial applications that led Analog Devices to mull steering the >> technology into battery management for vehicles, according to Aquilano. “It >> has five nines (99.999 percent) reliability, so they were very interested in >> applying this to the battery pack,” she recalled. >> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
