Is battery temperature taken into account

[Jojo]

Hello ABRP Team

I'm wondering if the battery temperature is taken into account with the influence on charging speed.

It seems that all EVs has different charging curves depending on battery temperature. Leaf, Kona, Niro and maybe even Tesla.

If I look to your collected data of Teslas charging curves, I cannot see the parameter battery temperature.

What I can see are some "statistical anomalies":

It seams to be important for route planning.

Thanks

Edited January 15, 2019 by Jojo

[theRealKanuk]

I agree: battery temperature is important when calculating the charge time. In winter I found that ABRP may underestimate charging time at the Tesla supercharger under certain conditions. For example during a recent trip ABRP recommended an early stop at a supercharger to top-off. When I got there the supercharger rate was around 60 miles per hour (17 kw/hour) instead of the expected 400 miles per hour (120 kw/hour) that ABRP had anticipated. Quite a difference! I think ABRP should consider the expected SOC% and battery temperature when arriving at the supercharger for calculating the recharge time.

Edited April 8, 2019 by theRealKanuk

[Jerry]

In case anyone is reading this thread, recent Tesla updates start preconditioning the battery when the nav has a supercharger as the destination.  With that, charging seems to happen at high speeds.  I haven't had much issues with low speed charging after they added that feature.

[Wolfy]

I don't know if ABRP can consider battery temperature.  They don't know what your battery temperature will be when you get there, and those variables will depend on the season, whether or not you're liquid or air (like my LEAF) cooled, and how your own driving habits (aggressive vs. slow and easy) will affect your overall temperature.

[Jason-ABRP]

We don't consider battery temperature yet.  We are collecting that information so that we can eventually build a model to help us incorporate battery temperature (and predict it when planning), but it's a little low on the priority list yet.  

[osahum]

Is there any update regarding if battery temperature is taken into account for charging time and/or range calculation? Batteries capacity shrinkage in low temperatures is well studied ..maybe some kind of a model can be built in to help improve predictions..

[TomTomZoe]

@Samuel-ABRP That would interest me too

[Samuel-ABRP]

We do not consider battery temp for charging yet. Without live data it's impossible anyways as we do not know which temperature the battery will have at a charge stop and in planning it is also not easy to figure out the temperature a battery could have at a specific charge stop. 

[TomTomZoe]

But with live data you know which temperature the battery has at beginning of the charge process. And then it would be possible to adapt the charging time depending on the actual charge current.

For example the CanZE OBD software of my former Renault Zoe Q210 was able to do this.

Edited April 2, 2022 by TomTomZoe

[Samuel-ABRP]

That does not help much though as the planning for a charge session and their charge stops are determined beforehand. Let's say we assume that the charge goes fast in the lower soc region and thus we recommend short stops but more often until for example 60%. This will not make sense if charging is slower right from the start and we would then recommend longer stops instead of multiple stops if there is not much difference or recommend to reduce speed. So this would then invalidate the whole plan and at the next charge stop it could already look different again. So very hard to deal with. 

[TomTomZoe]

But it would be possible to use the battery temperature at the start of charging to extend the expected charging time by ABRP at that moment if the battery temperature is not warm enough.

There are certainly a large number of vehicle-specific charging curves for ABRP from which one can deduce the dependence on the battery temperature.

With the Opel Ampera-e (=GM Bolt EV), for example, 25°C is required for maximum charging power. I would therefore like it if, when arriving at the charging station with a battery temperature of clearly below 25°C, in particular <20°C or <10°C, the planned charging break would be extended accordingly by x minutes at exactly that moment.

There is no need to change the number of charging stops, just adjust the length of the charging stop at the moment of charging a bit more to the cold battery reality.

Wouldn't that be an interesting possibility?

@Samuel-ABRP What do you think about?

 

Edited April 4, 2022 by TomTomZoe

[Samuel-ABRP]

Sure it would be really nice to support that. However it is a very complex topic. I own a Zafira-e Life and that one has 6 different charge curves programmed into the BMS. Depending on the SOC level you plug in, the outside temp and the battery temp one of these 6 charge curves is selected. If you get a slow charging curve, wait 5mins until the battery heated up a bit and then plug in again, you will get one of the better charge curves suddenly. So we never might estimate the right charging time once plugged in. I would rather propose to rely on the time the car shows, as that should be pretty accurate (at least for the standard 80% charge). If you do not want to change the other charge stops this is just about when to get back to the vehicle, right?

[TomTomZoe]

Mainly it is the reason 

You can also look at the Apple Watch app, which is now working again, or the smartphone when you should continue the trip (5 or 10 minute notice), but the latter only if you do not need the smartphone in the vehicle to transfer the OBD data while charging. 

Six different curves, crazy. Why can't the vehicle adapt it itself during charging?
There's still a lot that needs to be improved in the future.

We'll have to try your suggestion with our Corsa-e, which should also respond to this replug procedure, since it's the same PSA platform. Thank you for this hint. 

Edited April 4, 2022 by TomTomZoe

[Borgqueenx]

22 hours ago, Samuel-ABRP said:

Sure it would be really nice to support that. However it is a very complex topic. I own a Zafira-e Life and that one has 6 different charge curves programmed into the BMS. Depending on the SOC level you plug in, the outside temp and the battery temp one of these 6 charge curves is selected. If you get a slow charging curve, wait 5mins until the battery heated up a bit and then plug in again, you will get one of the better charge curves suddenly. So we never might estimate the right charging time once plugged in. I would rather propose to rely on the time the car shows, as that should be pretty accurate (at least for the standard 80% charge). If you do not want to change the other charge stops this is just about when to get back to the vehicle, right?

Still, if abrp doesn't hold account with any temperature for charging sessions it would be nice to at least make averages from it. Not holding account versus a gross average per car model would already improve things?

[TomTomZoe]

At the moment the used charging curve in the planning is that one at ideal battery temperatures?