Lithium or sodium for replacement

i see what you did there

 

I think I might wait before investing in a new battery pack. We seem to be in the nascent stages of what might be a quantum leap in battery technology. Or not, but in any case, it could be a major mistake to buy in at this stage.

 

It's either old skool tech, run at half it's operating capacity to give the maximum headroom to allow minimum cell management using a chemistry that can handle being over capacity charged short term with out failing completely ...

or

High tech advanced battery design that requires continuous cell level monitoring and balancing, because it doesn't have the ability to handle over capacity charging of any cell. This would involve a feed back loop that could control current in both directions, sensing any cell that is under performing and using that as the basis of the whole pack performance.

The way that last problem is dealt with in more modern battery design, is multiple cells in parallel to build the base capacity, then these groups in series to build voltage. This way, the BMS only has to monitor a single parallel group, any under performing cell is balanced out by the other cells in parallel .... I.E. a single cell in a 4 cells in parallel group drops to 50% capacity, the effect on the over all battery is only a 12.5% loss in capacity, not the 100% loss if it had been a single cell design.
A good active cell balancing system could minimise the loss in capacity even further, by splitting the capacity of the remaining series groups and supplying that back to the weak cell group when ever the voltage differential became apparent.

T1 Terry

 

Yes, send me $100 via cash app

 

Ahhh, but would you just spend it on more drugs?

T1 Terry

 

Is it sodium money??

 

That would be just rubbing salt into the wound

T1 Terry

 

That is a good one! Very salty!
Salt, is GREAT!

 

Sodium is not salt, it is a metal.
Sodium chloride is a salt, one of many salts.
A salt is an acid combined with a base.

 

Salt Sodium Salt Sodium Salt Sodium Salt Sodium Salt Sodium
It's the same thing, but it's different.
It's different, but it's the same....

Actually, Sodium ion....

Complain Complain Complain....

 

I'm no psychologist, but something is wrong...

 

That's the first step....

 

I'm back from the Mudder channel to post my version of a Li-Ion battery for the Toyota Prius. It's been in testing for several months and has been in development for a year, and it solves all the problems experienced by the Lithium project.



I know you'll be completely skeptical about a stranger claiming to solve the ongoing problems of a project that's been running for years. But I'm happy to answer any questions you may have.

 

How did you solve the battery management system (BMS) issue? Which was the heart of the problem.

 

Kudos to RJParker for explaining his acronyms, and not just using them as a lazy way to type, as the Gen-Zers do,

 

Neat! Some questions I can think of offhand:

• What chemistry is used?
• What is the configuration (as _s_p so for example the car's original NiMH battery is 168s1p)?
• How many intermediate voltages are monitored for management?
• How is balancing accomplished?
• Is the car's original battery smart unit with 14 voltage inputs retained? Are those simply attached to the bus bars (as I think I'm seeing in the photo) or to different dedicated terminals?

 

There is no need to solve what is not broken. The problem always came from using a technology (Lifepo4) and insisting on it that it was not valid for the use that was being given to it (high discharge).

In addition, it does not even match in voltage ni-mh and lifepo4

 

The solution was always the Li-Ion because it matches perfectly with the voltage of the ni-mh. The configuration is 56S 3P 12Ah. Intermediate voltages are not measured, cells are not balanced. Direct swap with the bus bar of the car. A properly made battery does not need active balancing

 

@Vencedor, I propose creating a new thread with more details to support your claim that "solves all the problems experienced by the Lithium project". I would obviously like to review your solution, if you're up for it.

 

It's fine with me. But I don't know how to make a new topic or on what topic?. Could you do it and I start answering from there?

It is also ready to be reviewed. How many modules do you need?