dylorama
Posts: 2
Joined: Tue Jul 17, 2018 6:28 am
Delivery Date: 10 Sep 2018

Why don't extra range plug in batteries exist

Wed Sep 26, 2018 10:05 am

Hi there,

This may be a very random question. Just out of curiosity's sake, I have seen a few videos where some guys get a battery pack from a wrecked leaf, reconfigure all the cells, put them all in the trunk of their current leaf, and splice it into the main power cord in the car. I would NEVER attempt this.

However, it did make me wonder - why don't Nissan and other manufacturers offer extra 'plug and play' suitcase sized batteries that you could plug in to the car and extend the power available to the car by 10 or so KWh? Like if there was a special plug in the trunk. You would only use them when you are going on a long trip, otherwise they sit in the garage.

This would offer an extended range without having to offer a whole other longer range model. Also the owner would not be lugging around extra capacity that they would only use 10% of the time. If it was parallel to the main battery it would not increase the voltage, just the available amps.

I'm not an engineer, so I may very well be missing something. Would this not be a feature that would be relatively simple to do?

theothertom
Posts: 16
Joined: Wed Sep 19, 2018 9:26 am
Delivery Date: 19 Sep 2018

Re: Why don't extra range plug in batteries exist

Wed Sep 26, 2018 10:25 am

Just a guess but "large" LiOn batteries require a cooling system....

WetEV
Posts: 2369
Joined: Fri May 04, 2012 8:25 am
Delivery Date: 16 Feb 2014
Location: Near Seattle, WA

Re: Why don't extra range plug in batteries exist

Wed Sep 26, 2018 11:29 am

dylorama wrote:However, it did make me wonder - why don't Nissan and other manufacturers offer extra 'plug and play' suitcase sized batteries that you could plug in to the car and extend the power available to the car by 10 or so KWh? Like if there was a special plug in the trunk. You would only use them when you are going on a long trip, otherwise they sit in the garage.


Cost.

Start with the problem of charge level. If the "suitcase battery" was half charged, and the car was fully charged, or vice versa, how would you connect the two together? Can't just throw a switch and connect them, or a very large current will flow. So would need a DC-DC converter for isolation, costing money.

Extra wires, extra connectors, all cost money. Would be far cheaper to just install another 10 kWh or so in the car.

Also some safety concerns, and probably more.
WetEV
#49
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red (Totaled)
2014 Leaf SL Red

SageBrush
Posts: 2911
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: Colorado

Re: Why don't extra range plug in batteries exist

Wed Sep 26, 2018 4:28 pm

1. Cost
2. Cost
3. Lousy Design
4. Cost
5. Cost
... ... ...
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Car is now enjoying an easy life in Colorado
03/2018: 58 Ahr, 28k miles
11/2018: 56.16 Ahr, 30k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

User avatar
Nubo
Posts: 4940
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: Why don't extra range plug in batteries exist

Wed Sep 26, 2018 7:59 pm

Would require a lot of accommodation to make it meet OEM level (not hobbyist-level) occupant safety, including crash-testing. Also it would be hard to guarantee proper handling and storage of the aux pack when not in use. Too much expense and liability risk to facilitate what would be an edge-case.
I noticed you're still working with polymers.

Return to “Batteries & Charging”