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.
>> 

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