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Discussion Starter #122
Engine belt tensor bearing went bad, so had to order a new one along with a new belt. Installed them yesterday, so the car is back on the road, ICE only. I've not ordered the LTO batteries yet, $$ issues during this COVID-19 situation. Once projects funding resumes, then I'll order the LTO 2.9Ah cells (2x 36s2p). I'm using 4s1p 80Ah LFP cells to operate the ICE. The lead-acid 12V battery died a long time ago. Only getting around 48 mpg combined city/hwy, according to the dashboard. Still much better than my other ICE cars. Hope to get back to his project again, soon.
 

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Discussion Starter #123
Another LFP cell mfr in China offered a 5C/35C 5Ah cell at a good price. It's very similar to the A123 chemistry. I'd like to breakdown the details to get your opinions, but I'll start a new thread on this particular cell to make it easier for other newbies like me to find a specific topic easier.
 

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Discussion Starter #127
I can only get the 2.9Ah and 40Ah LTO cells at the moment. The 40Ah one is cylindrical.
 

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Discussion Starter #129
66160 2.3V 40Ah LTO Cell
Dimensions:66(φ)*160(H)mm
Weight: 1.22Kg
Max. Constant discharge/charge rate:10C
Pulse 10 Sec discharge/charge rate:20C
Discharge Cutoff Voltage:1.5V
Charge Cutoff Voltage:2.9V
Cycle Life:25000 times​
Working Temp: -50℃~65℃
 

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Discussion Starter #130
A123 Systems 3.3V 20Ah pouch cell
Dimensions: 7.25(T)*160(W)*225(H)mm
Weight: 496g
Constant discharge rate:15C
Peak discharge rate: 30C
 

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Discussion Starter #131
A123 26650
Cell Dimensions (mm) Ø26 x 65mm
Cell Weight (g) 76
Cell Capacity (nominal/minimum, Ah) 2.5/2.3
Internal Impedance (1KHz AC Typical) 6m’Ω
Specific Power (nominal, W/kg*) 2600 W/kg
Voltage (nominal, V) 3.3
Recommended Standard Charge 2.5V to 3.6V CCCV, 60 min
Max Continuous Discharge 50A
Max Pulse Discharge (10 Sec) 120A
Operating Temperature -30°C to 55°C
Storage Temperature -40°C to 60°C
 

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A lithium pack does not have to be LTO, it could be Lifepo4 etc..
In fact, the LTO cells have some disadvantages. They are heavy and have low specific energy. The advantages which made them attractive were convenient packaging, long expected life, and price(while Greentec had them).

A few years back there was a lot of excitement about the A123 prismatics. There was a group buy of a dozen sets of so.

IMO, it all got put on hold while everyone waited for a packaging solution. Mike D worked on packaging for quite a while and then IamIan took over the work and completed it. He is running an A123 pack currently. This appears to be a viable solution, depending highly on the final price.

There are some historic threads on the subject. I'll see if I can ferret them out:)
 
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Discussion Starter #133
That would be much appreciated, since you know how lazy I am about that sort of thing.
 

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Here's one important link:

 

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Discussion Starter #136
192V/3.65V = 52.6s. So, would 52 or 53s be safer? They can quote on supplying a soft-pack with all the cells laser-welded (e.g. 50-53s1p). Let me know your preferences.
 

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50 x A123 is a more natural good OEM voltage.

It also means you can do without a BCM fooler as the number of cells divides by ten.

Note.

Your supplier will need to provide a tap wire every 5 cells.
The pack will also have to be split into two packs of 30 & 20 S each.
 

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Discussion Starter #138
Can you give me a simple schematic showing the tap wire every 5 cells in a pack of 25s, including the wire gauge and length?
 

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OK Just to firm this up and make it as compatible for the ZE1/HCH1 as possible we need two blocks of different sizes.

1x 30 cells.
1x 20 cells.

This has been discussed before so I won't repeat it. (I have edited my prev post.)

Attached is my simple schematic diagram, it needs independent checking!

If we want to add the PTC sensors from original OEM tap boards they would have to be harvested and reused unless we find some new ones.

Up to you now.. Good luck..

EDIT. Schematic removed to update taps. Back soon..

Note I am assuming 20Ah A123 for the conversion.
 

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Discussion Starter #140
Provide PTC sensor specs, and I will try to find new ones.
 
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