Panasonic Ncr21700t: Datasheet

The Panasonic NCR21700T is a high-performance lithium-ion cell widely used in electric vehicles, power tools, and high-drain electronics. It utilizes a Nickel-Cobalt-Aluminum (NCA) chemistry, optimized for high energy density and steady discharge rates. 🔋 Core Electrical Specifications

Keep in mind that these specifications might not be comprehensive or up-to-date. If you need accurate and detailed information, I recommend finding the official datasheet from Panasonic or a reliable source. panasonic ncr21700t datasheet

Testing, characterization, and modeling resources

  • Manufacturer datasheet: authoritative source for electrical/thermal limits, recommended charge/discharge profiles, and safety notes — always use for design constraints.
  • Independent labs and databases (e.g., Batemo, cell teardowns, and test houses): provide measured C‑rate performance, impedance, thermal characteristics, and aging data across SOC and temperature — valuable for pack modeling and simulation.
  • Cell modeling: electrochemical/thermal models (e.g., Rint, ECM, DFN) tuned with measured data permit pack‑level simulation; Batemo offers high‑precision digital twins for many cells.
  • Recommended tests for designs: capacity vs C‑rate, internal resistance/impedance spectroscopy, thermal rise vs current, calendar/cycle aging at application C‑rates, abuse tests (overcharge, nail penetration per standards), and pack BMS integration tests.

. This is roughly 40% more than the maximum capacity of the older 18650 standard. Voltage Range: Operates at a 3.6V nominal voltage , with a charging peak of . It is critical to never discharge below to avoid permanent internal damage. Energy Density: It packs a punch with (volumetric) and implement robust BMS and thermal management

  • The Safety Stop: The datasheet includes a PTC (Positive Temperature Coefficient) and CID (Current Interrupt Device). If the cell overheats due to a short circuit, it shuts off permanently. This is a safety feature, not a bug.
  • Best Practice: For continuous high drain, stick to 20A-25A. Use the 35A for short bursts (e.g., an e-bike accelerating up a hill).

Developed in partnership with Tesla for long-range EV packs; known for high reliability in massive multi-cell configurations. Промелектроніка Промелектроніка an e-bike accelerating up a hill).

2.4. Internal Resistance (IR)

The datasheet guarantees ≤30 mΩ (AC IR at 1 kHz). Fresh cells often measure 18–22 mΩ. This low IR reduces voltage sag and heating. Over time, IR will rise to ~40 mΩ near end-of-life (500 cycles). High IR is the first sign of a failing cell.

The "T" in NCR21700T is often associated with cells that feature Panasonic’s high-power engineering, frequently seen in advanced electric vehicle packs

Concluding perspective

The Panasonic NCR21700T occupies an important niche: high energy per cell in the 21700 mechanical form factor suited to designs where runtime/range and energy density matter more than extreme continuous discharge. Successful use depends on treating the cell as an energy‑centric building block: respect charge/discharge limits, implement robust BMS and thermal management, derate where longevity or safety is critical, and validate real‑world performance through testing and modeling. For high‑power use cases, consider power‑optimized 21700 variants or more aggressive parallelization combined with careful thermal design.