Crazy man wants a crazy big battery! Craziest ways to do it?? Please explain

The main limit in hybrid battery pack upgrades is we've not been able to rewrite the code that runs the battery ECU to allow a different power curve and better performance. But after 8 years of research the guy who built Dr. Prius app found a way to use the most advanced and safer battery chemistry that matches the expectation of battery ECU, but holds way more amps and way more charge.

Best part is that it's slightly cheaper than OEM, but outperforms it in every way. This LiFePo4 pack charges faster, almost never drops below three bars when mountain climbing or in EV mode and in hot weather AC works ways better. And if you sell your existing pack while it's still healthy you can offset alot of the cost.

Also if you use my affiliate link I can offer you unlimited tech support: https://projectlithium.com/?ref=9qLPw

 

What is our battery I have to look it up again or whatever 211 volts at 6,500AH or something close to that so I guess a big nice person battery would be10,000 AH 12,000 somewhere in they're,? I don't know much about it but I would think as long as you stay in the 211 volt range of the car loading up the trunk with cells wouldn't be any problem except for the weight eventually you're back end would be dragging the ground so there has to be a cut off of some point of the amount of amp hours you're willing to have versus the weight until batteries get it extremely more lightweight.

 

In Australia, If you buy a BYD Atto 3, it'll cost you around 44 thousand Aussie Paso's. (That's Aussie Dollars) If you Opt for the longer range version, it'll add $3000.00 to the cost. An extra 10KW of battery, fitted for $3000.00. If the whole battery pack costs 30C/Watt, that means the whole battery is $18,000.00. That's for the latest LFP Blade Battery pack. I just replaced the battery pack in my gen2 prius with a factory replacement that cost $2300.00.That equates to around $1.60/Watt, and that's for 25 year old technology NMH Batteries. I understand the R&D behind Dr. Prius's LFP battery pack and the costs involved, but to buy them in Australia would set you back close to around $4000.00. That's around $2.60/Watt. I would love to put a set of those in my Gen 4 to overcome the annoying semi limp mode it encounters every time the batteries hit a mere 42 degrees C.I can't believe this hasn't been a discussion on these pages and a demand to Toyota to rectify the problem. It happens whenever it's parked in the hot sun, but mainly during and after descending long grades. The symptoms of which are; Batteries cease charging, Engine runs on continuously for no reason, Acceleration is like an old clapped out Hillman. If it were possible to buy the Nexcell's direct from China, the cost would be considerably less and would be much more viable.

 

I've seen the next cell logo on Alibaba.com recently round tubes some kind of lithium-ion business kind of like what musk used to use initially I guess yeah I saw them also years ago when I guess the guys doing the doctor Prius thing we're just getting started and I guess I saw a discussion about it here but like 5 years ago 4 years ago I was not a member here then and I had remembered when I was on Alibaba doing some other business I had seen that nex cell logo. And I went back to look for it and sure enough there they were around the cell battery setups for the Honda insight and I think the early Prius which if it fits the Gen 2 It can easily be racked in a Gen 3 and I don't remember what they said then that would cost I had to buy you know 50 units or something whatever at like 899 a pop or something like that and I wasn't sure what I would get and wasn't sure about wiring and all sorts of other things and at the time didn't even have a Prius it was just an interest that just died out because of the amount of having to purchase.

 

60 of these connected in series would give you the 224v required, and as an addon, would increase your battery capacity by 3 times. Having a means of independent disconnect it wouldn't interfere with the original equipment and hence reliability, but the trick would be to incorporate a 60 cell BMS into the pack. In theory it seems feasible but would require a bit of expertise.
4pcs 3.2v 14ah Battery Pack Lifepo4 Phosphate 14000mah For 4s 12v 24v Motorcycle Car Motor Batteries Modification Nickel - Battery Packs - AliExpress

 

If you were looking at cylindrical batteries for the Prius, they were probably the aftermarket NMH batteries that are around. Not viable I don't think.

 

LOL

 

Right?

 

Since there is no grid charger provision for a Gen 2 or Gen 3 Prius, you will find that every kludge you come up (at your knowledge level) with will have a negative impact. The Prius is a nicely made integrated system. An example: if you feed too much power into the hybrid battery, it will hit max charge and will no longer do regenerative braking. Side effect: rapid brake wear. There are many other ways that things can go wrong.

Dan

 

You can do it. Don’t let anyone saying ecu reprogramming is needed to deter you’re cool idea. Build a grid charger that runs on renewable energy and you’ll be set!

 

The problem with your idea is not that it's impossible, nor even that it's a bad idea. The hitch is that your current knowledge level is likely to lead you into creating something unsafe. A similar idea was pursued in the early 2000s, making a normal Prius into a model that could run off the battery for a few more miles and that could store more energy from regeneration.

As I recall, it even boosted the MPG by a couple percent. But they accomplished it by adding some extra circuitry to fool the car into thinking that the main battery was full, empty, etc as needed. It was a relatively simple circuit.

But when you are working with lithium based batteries you have to carefully manage the charging and discharging. If you don't do it right you may damage the batteries, start a fire, etc.