Project Lithium Soother Test

Hey guys there are solution here already.
I wire up 84s BMS with CAN bus and physical monitors to each cell comes with 6 temps sensors
I wire the 70s 8A Lipo4 Battery with 15A Balancer (way way overkill) set to auto balance
if any cell goes off then it will quick balancer if still not able to reach the condition then main contactor will be cut off by the 84S BMS System.

(I suggest to add additional 16 temperature sensors for activity monitoring with a bigger brashness blower) also main battery wire can upgrade from 8 AWG to 4 AWG for max current flow.

In addition the BMS has its 12v Battery service as UPS backup power when car is switch off the BMS still actively running for another 10hrs.

1.Get youself an BMS from Aliexpress
customize 4S 96S BMS system 12S 24S 36S 48S 60S 72S 84S 96S 100A 150A 96V 108V 120V 132V 144V 168V 180V li ion lifepo4 LTO BMS

2.Get yourself an 15A 24s Balancer from Ali express x3 (24s each)

Enerkey 4A 8A 10A 15A Smart Active Balancer 3S 4S 5S 6S 8S 14S 16S 20S 22S 24S Lifepo4 / Lipo/ LTO Battery Equalization With APP

3.Get youself a super high charge and discharge battery rated 10C charge 15C discharge

New In Box Headway 38120 HP 3.2V 8AH Lifepo4

 

Double posting is back? Maybe only with wild ideas? Must have been some good stuff last night.

I would buy a gen4 or 5 hybrid before even sketching out an alliexpress monitoring system.

Got to admit, the hardware would be interesting to see in real life.

 

All that and you didn’t get us a code to save us 5% off. Whiskey tango fox!

 

Sorry for the double post, i did not realize it.....
What i mentioned on about expressible is not just experiment i already have it implemented and been driving it..

1000021867 by KevinC1985 posted Dec 8, 2024 at 3:58 PM

 

With my customer pack im able to cell level monitoring balancing and check for individual cell resident level. In total I have installed 70 cell 3.2v 15A Lipo4 battery.

However one thing still missing is: it would be perfect if it can talk to the battery ECU and throw code when one of the cell goes bad. So here is my second through.

I have fitted a OEM Toyota Prius lithium pack in the Gen3 NiMH case. Air flow has been modify and so far so good.
If you look carefully the ECU wire of the NiMh and the Lithium isn't so different. In CAN System each ECU process data independently. So If I modify the wire of the 2016-2021 Battery smart unit/battery ECU connection and have the gen3 system recognize it the lithium upgrade will be perfectly integrated into the system

In addition the original Toyota Lithium battery is only rated 3.7 3.5Ah, I installed an 4Ah balancer as additional protection.
All temp sensor fill with extra thermal adhesive.

I not sure if the Prius has a memory build into the system to keep track battery voltage, SOC. In addition I added a extra battery to the ECU, so when the car is power off the ECU will still running for an additional 55 hours with little energy use. The idea is when the car shutdown the ECU will still remain active.

 

Additional solution:
The Prius Gen3 has lithium version:
Prius Plugin has 4KW of battery
Prius Alpha (Prius V outside of USA) 7 seat version has 0.75 KW of battery.

The battery smart unit/battery ECU connections is the same as the NiMh version. The high voltage connection temp connection is different of course but the external connection to the car is the same as the Nimh Battery 8 pin connection.

Diagram of connection #1 Ground, 4 GCT, #8control signal etc (so the battery ECU communicated back to the car with Current value, Serial communication, can high can low, Blower motor control, and IG signal... refer to repair manual..
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Given the ECU is recognize/register by the car and battery size has to be blow 10Ah (to not mess up the default SOC). With the OEM Battery ECU, voltage sensor, temp sensor you can mount whatever 3.6-3.7v battery you like into the car.

Again this is the solution to what mudder is mention earlier: Cell level monitoring is super important and if something goes wrong the car should know right the way(Error code is throws, cut off main relay etc) so it can prevent catastrophic event!!

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