Tesla 16v li-ion battery
tesla moved from lead acid 12v batteries to a li-ion 16v battery year 2022-current for model 3 and Y. and the model S plaid
hackig thread: https://openinverter.org/forum/viewtopic.php?p=78964#p78964
info:
- CATL prismatic Cells
- 1p4s
- 99 Wh
- 4 lbs / 1.8 kg
- 16v internally
- LINBUS for vehicle coms on voltage, soh, crash events, etc
- internal BMS: monitors temp, controls charge and discharge rates
- part number 1598486-99-D
its theorized that the CATL cells are the following specs:
- NMC
- 6.9 Ah
- 3.7 V nominal (4.2 V max charge voltage, 2.75 V minimum)
- charging temperatures: from -10°C to +45°C
- discharging temperatures: from -20°C to +60°
- max charging: 10C
- max peak discharging: 50C
- cycle life: >2,000 cycles (80% of initial capacity at 3C rate)
the brains of the operation is the: mm9z1_638
part of the S12Z family of processors
The battery locks out in a crash event, and may even begin bleeding the cells to 0v for safety.
Charging:
if the battery is in a lock out state and will not take a charger, the cover needs to be removed to charge the battery directly.
disconnect the cell taps from the bms, and then connect a 16v power supply to the cell tabs on the bms board. The BMS will need its eeprom/firmware reset
Cover removal:
Removing the cover is required to recharge and re-flash:
remove the 4 bolts that hold cover to the the sealed connector
using a blow torch or heat gun along the edges of lid, this will soften the epoxy sealing the lid in place.
start prying with a flat head screw driver, while applying heat. the lid should release and now be free.
Software:
To reuses the battery, it needs to be reset by dumping the eeprom and re-flashing cleared firmware.
there are a few methods to go about this:
- Xhorse VVDI Prog now supports re-flashing
- S12Z In-Circuit Flash Programmer Software
- USBDM-Flash-Programmers