←back to thread

Toyota is recycling old EV batteries to help power Mazda's production line

(www.thedrive.com)
304 points computerliker | 2 comments | 23 Aug 25 18:29 UTC | HN request time: 0.441s | source
Show context
zhyder ◴[27 Aug 25 17:50 UTC] No.45042740[source]▶
Neat idea to mix batteries of different age and chemistries. I've wondered why EVs couldn't do that too with some power electronics and SW. If an EV battery could have multiple such modules, it'd:

1) Make it easier to carry a cheaper lighter less-natural-resources-consuming battery most of the time. Go to some "gas station" to rent and add more modules when taking a road trip

2) Make it cheaper to replace the 1 module used a lot at its EOL, thereby making EVs last longer and be viable as cheap used cars even past 10 years like ICE cars are

3) Allow easier upgrades as chemistry improves: solid-state, sodium ion, etc.

Modules could be electrically tested for fit. I'd think the fit range would be quite wide (e.g. if one supported lower max discharge rates than another) given the headroom we have with EVs' power these days: they have far-more-than-needed power (which mostly comes for free with EV range).

The tradeoff is that they'd need to be built to be modular with some standardization on module dimensions (maybe we'll have "ZZ" size like we have AA, C, etc today), and would take a tad more volume in the vehicle (though the limiting factor is weight rather than volume). Easily worthwhile over the current model with a huge monolithic pack.

replies(9): >>45042833 #>>45042894 #>>45042908 #>>45042938 #>>45043196 #>>45043239 #>>45043635 #>>45044625 #>>45046054 #
1. rubyn00bie ◴[27 Aug 25 18:30 UTC] No.45043239[source]▶
I hadn’t thought about different sizes/weights but this does remind me of Nio’s battery swap network. Which I’ve always been fond of in principle. I think at some point in the future, when range isn’t such a competitive advantage in the EV space we’ll see a push towards standardization and something like this will likely occur. I’d guess something around the 1000 mile mark for an EV. Absurd, yes, but at that point no one will complain about range and that sort of implied density/efficiency also allows for a better towing experience (at least here in the states). If someone can get a 1000 miles of range, but only drives 100 miles at a time TCO drops immensely because tires/brakes last much longer at lower weights.
replies(1): >>45051194 #
2. 542354234235 ◴[28 Aug 25 12:11 UTC] No.45051194[source]▶
It feels like Neo is the opposite of where things should go. The great thing about EV is that every outlet is a refueling station. More EV charging for apartment buildings and parking lots feels like the answer. Those battery swap stations are insanely complex and expensive, and the complexity and added weight on the car are very significant. Unlike a gas station that just needs two nozzle types, or an EV charging port standard, having to standardize battery packs for everything from compacts to trucks would be a nightmare. Most people are not taking hundreds of mile road trips most of the time. Slow charging your car while it sits at home or at work or at the shop will work for 90% of cases. I could see the case for industrial or work vehicles, where keeping them running constantly is a legitimate need, but for personal vehicles that sit in driveways, parking lots, or garages 80% of every day, battery swaps feel like massive overkill.