Stellantis EVs - Chargers and Inverters in Battery Modules

The devil is always in the details. I think the concept of smaller inverters being in the module vs a bigger inverter in the motor / car is a reasonably good approach if done right. Look at solar panel with micro inverters, they won't let one shady cell ruin the whole roof and they are cheap enough to work well even if one bad unit, cell or inverter, be taken out.

Does it make them hard to repair? It also depends, you can approach it by disabling one module or you can approach it by swapping the whole module and rebuild them off site. It does mean you are more likely with a car that is imperfect but still drive-able rather than a perfect car with no bad module at all as it age.

I'm more concerned about Stellantis' corner cutting than any theoretical thing.
 
Ok let's dive in.

Toyota
Ford
Honda - Never made a full EV until very recently so there is no track record of a battery.

Hybrids arent EV's.

Sure - Nissan made the air cooled leaf - we know the leafs are pretty wasted and know nothing about Ariya.

Sure - GM made the EV 1 but there were no results published about battery longevity so no one knows if they got it right.
The "new" gm's are too new to have an established record. We've barely seen any ultium products.
The bolt was a gong show with a full on battery recall, looks like they fixed it.

Wa the the EGolf a full EV? -not one you could conceivably replace an ice for highway trips with.

We can say Hyundai has been in a few year as well with the little kona and we're what a year into GMP now. Same with ID series.

So sure - other guys have done it, but for a far shorter time, varying results, and not a lot of data on degradation and 1,2, 300 K lives like we can track with teslas.


I only have real historical user data on one companies product.

Yeah, I forgot about HyunKia. They have been doing this for several years. Sure, not many high mileage examples yet but also so far so good.

And the Chevy Volt is absolutely an EV. it happens to have an engine, but it works fine as a purely electric car, albeit with a ~40 mile range on the first gen and a bit more on second gen.

And I have no noticeable degradation on my Volt. Only at 85K miles but that’s across almost 10 years. And the thermal management is great, although the lack of DC fast charging and topping out at a pathetic 3Kw max on AC charging means it probably lives an easy life.
 
Yeah, I forgot about HyunKia. They have been doing this for several years. Sure, not many high mileage examples yet but also so far so good.

And the Chevy Volt is absolutely an EV. it happens to have an engine, but it works fine as a purely electric car, albeit with a ~40 mile range on the first gen and a bit more on second gen.

And I have no noticeable degradation on my Volt. Only at 85K miles but that’s across almost 10 years. And the thermal management is great, although the lack of DC fast charging and topping out at a pathetic 3Kw max on AC charging means it probably lives an easy life.

The chevy volt is a series- parallel hybrid with extended battery range.

You nailed some of the big diffs.

It's battery is far more coddled from a charge speed and discharge perspective always buffered on the bottom, and much more slowly filled compared to a full blown EV.

The volts fantastic- but shy of a full EV.
 
Still has Li-Ion batteries in it. Also.. I've been running it mostly on battery since I got it at 78K..my lifetime fuel economy is 175MPG. It was only about 60MPG when I got it.

Its killer. Love the volt.
 
https://www.thedrive.com/news/new-stellantis-battery-system-could-be-the-key-to-smaller-cheaper-evs

I don't like this - If your charger or inverter fails (and there will be many more to fail vs just one charger and one to two inverters) the whole battery pack has to come out and apart to fix it. vs in a "traditional" EV those are separate components that can theoretically be replaced without removing and disassembling the entire battery pack. Thoughts?
Throw away society...
Good luck, if pack is glued like Tesla
 
You don’t have to like it. There were some benefits to this tech. A few years back some folks at University if Utah as I recall were working this sort of thing. More conversion at the cell or pack level enables better balancing, more utilization of certain cells, better control, and more redundancy actually.

It can make the battery pack more serviceable and the common units lower cost because they don’t have to be rated the same. Only certain components need to be rated for full bus voltage, and current can be shared more effectively dependent upon the design of the final interface.

It isn’t all bad. There is more opportunity for innovation, and less cost than a bit monolithic converter.

Efficiency may be compromised, not sure…
Sounds good, I hope they're onto something. Me, I'd let the early adopters who feel they have to be the first in line for a new technology or product offering have at it. Let them sort out the problems, if any. Who knows they might get lucky, I have my doubts. I look at Ford, there are a lot of unhappy Lightening owners, I think we'll have the same for this.
 
The chevy volt is a series- parallel hybrid with extended battery range.

You nailed some of the big diffs.

It's battery is far more coddled from a charge speed and discharge perspective always buffered on the bottom, and much more slowly filled compared to a full blown EV.

The volts fantastic- but shy of a full EV.
Batteries in hybrid mode typically are designed/biased towards rate over energy. The chances to charge and absorb are shorter so they need to run a bit harder. Discharge is short lived when needed, so again drives the need for rate.

EV just leverages energy and size to get power, but its actual power to energy ratio is low. Hybrids are the opposite and live a practical long life because such a narrow SOC is used that overpotentials and degrading conditions aren’t encountered really.
 
Batteries in hybrid mode typically are designed/biased towards rate over energy. The chances to charge and absorb are shorter so they need to run a bit harder. Discharge is short lived when needed, so again drives the need for rate.

EV just leverages energy and size to get power, but its actual power to energy ratio is low. Hybrids are the opposite and live a practical long life because such a narrow SOC is used that overpotentials and degrading conditions aren’t encountered really.

Yup - all that to say we cannot look at the Volt as a template for how an Ultium pack will perform over the long haul.
 
Yup - all that to say we cannot look at the Volt as a template for how an Ultium pack will perform over the long haul.
As I understand it thenultium pack is scalable and may be able be used for different powertrain approaches.
 
As I understand it thenultium pack is scalable and may be able be used for different powertrain approaches.
Thats what they say.. Im not sure how connections and coolant flow works in scalable system like that.
 
Look at solar panel with micro inverters, they won't let one shady cell ruin the whole roof and they are cheap enough to work well even if one bad unit, cell or inverter, be taken out.

Solar Micro inverters (one per panel) provide a lot of benefits:

1)They can be used to make any size array, there's no need to stock multiple sizes of inverters.

2)They fit right under the panel, using otherwise wasted space. There's no need to find room for an inverter.

3)The wiring to the microinverters is standard 240VAC wiring. It's not DC wiring. It can also be a smaller gauge due to the higher voltage.

4)They make rapid shutdown easy to implement--the wiring coming off the solar panels has NO voltage on it when rapid shutdown is in effect. (Rapid shutdown is a building/fire code requirement, which means that the array must stop producing voltage when the power fails or is turned off).

5)They implement diagnostics that lets you quickly see if a panel or inverter has failed.
 
https://www.thedrive.com/news/new-stellantis-battery-system-could-be-the-key-to-smaller-cheaper-evs

I don't like this - If your charger or inverter fails (and there will be many more to fail vs just one charger and one to two inverters) the whole battery pack has to come out and apart to fix it. vs in a "traditional" EV those are separate components that can theoretically be replaced without removing and disassembling the entire battery pack. Thoughts?
Considering that Stellantis can barely build an ICE (off of 100 year old technology) that is consistently reliable, this idea is borderline terrifying. :D
 
Considering that Stellantis can barely build an ICE (off of 100 year old technology) that is consistently reliable, this idea is borderline terrifying. :D

It's true. They make some products that my inner child wants to buy. It's great marketing, I just can't deal with that on a daily basis with my current vehicle demands.
 
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