Ncr21700t Datasheet Hot: Panasonic

The cell shows an almost flat voltage curve around 3.6V for most of the discharge, offering almost the full 5000mAh. 10A Discharge:

In a sealed battery pack (like on an e-bike), the lack of airflow leads to heat accumulation. Managing the Heat: Datasheet Recommendations panasonic ncr21700t datasheet hot

The primary driver of thermal behavior is the cell's internal resistance (DCIR). Panasonic's datasheet lists typical DCIR at 1 kHz as ≤ 20 mΩ, but under DC load at 15A, effective resistance rises to ~25 mΩ due to polarization. Joule heating (P = I²R) at 15A yields approximately 5.6W of internal heat. This heat must be conducted through the jellyroll to the can wall. The datasheet’s thermal derating curve shows that at 20A continuous, surface temperature hits after 10 minutes in still air—exceeding the recommended 60°C operating window for longevity. The cell shows an almost flat voltage curve around 3

Suggest to keep it running cool. Let me know how you'd like to proceed! NCR21700 data sheet Panasonic's datasheet lists typical DCIR at 1 kHz

The NCR21700T, like many Nickel-Cobalt-Aluminum (NCA) chemistry cells, generates heat during high-load discharge.

Here are key "hot" (thermal / high-temperature / safety) specifications and important electrical/thermal limits from the Panasonic NCR21700T cell datasheet (NCR21700T — high-capacity 21700 Li-ion):