165
You Need Way Less EV Range Than You Think: Study
(insideevs.com)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 22 Feb 2024
165 points (100.0% liked)
Electric Vehicles
3229 readers
105 users here now
A community for the sharing of links, news, and discussion related to Electric Vehicles.
Rules
- No bigotry - including racism, sexism, ableism, casteism, speciesism, homophobia, transphobia, or xenophobia.
- Be respectful, especially when disagreeing. Everyone should feel welcome here.
- No self-promotion
- No irrelevant content. All posts must be relevant and related to plug-in electric vehicles — BEVs or PHEVs.
- No trolling
- Policy, not politics. Submissions and comments about effective policymaking are allowed and encouraged in the community, however conversations and submissions about parties, politicians, and those devolving into general tribalism will be removed.
founded 1 year ago
MODERATORS
Lmao go for it, I deal with systems shoving kiloamps at multi-tens of kv around quickly, I'll chalk it up to a small fry "power" electronics engineer not knowing better, as is customary for you so far.
GaN MOSFETs, because igbts are too slow, tech you, @dragontamer@lemmy.world, haven't even gotten to touch yet. TeChNiCaL MaGiC in your parlance.
So you do touch BMS systems and understand that the hundreds or thousands of MOSFETs that control the electrical currents of a ten-thousand cell battery pack are arranged in systems of series and parallel ... Running advanced modeling software that tries to peer into the internal chemistry of modern cells...
Yet you want to convince me that this is simpler than the like, 15 gears that make up Toyotas Powersplit Device?
In the long run, yes.
How do you account for tribological degradation in tolerances over time? There are techniques to negate the problem entirely, my 40+ year old Japanese motorcycle uses high-ish pressure hydrodynamic bearings to allow oil to be the "wear" surface... But it isn't foolproof.
Newer techniques rely on better metallurgy, oil additives which precipitate on designated surfaces, etc etc etc. It's one of those things you and I have both observed where the more you look at it, the more complex it gets.
Now change gears (haha) and observe the complexity of analog/digital systems. You and I front-load the complexity, so that any configuration changes should (mostly) be possible in software. "Oh no, we didn't use this particular junction of p-n MOSFETs"... They added $3 to the BOM, but our flexibility/redundancy is increased.
Look, you should know as well as any EE that solid state systems, when run within parameters, have a tremendous unchanging mtbf. While there are currently issues with undersizing MOSFETs and igbts, I expect our engineering models (in our heads) of what to expect from these evolving electronic components to adapt to these new operating environs, the already reasonable reliability will only increase.
Failure of these packs and their bms' are low enough that we can point to specific failures, versus how often we see someone with serious ICE engine issues in the local mechanic's shop.