Enpower Greentech 21700-4.5Ah Safety and risk management - particularly around overheating and thermal runaway during flight.
Discover the Enpower Greentech 21700-4.5Ah cell, designed for safety in EVTOL applications, addressing overheating and thermal runaway challenges.
Value Propositions
Cylindrical 21700 form factor for optimal design flexibility.
Nominal capacity of 15.84 Wh, ideal for UAV applications.
Top-quartile volumetric energy density of 619 Wh/l for extended flight times.
Maximum continuous discharge of 60 A, supporting high-performance UAVs.
Gravimetric power density of 3130 W/kg, ensuring lightweight solutions.
About the Cell
The Enpower Greentech 21700-4.5Ah cell features a cylindrical 21700 form factor, providing a nominal capacity of 15.84 Wh and a nominal current capacity of 4.4 Ah. With a volumetric energy density of 619 Wh/l, it ranks in the top-quartile compared to the database median of 541.67 Wh/l, making it an excellent choice for long endurance drone batteries. The gravimetric energy density of 229.57 Wh/kg is also competitive, being around the median of 210 Wh/kg. The cell's volumetric power density of 8447.4 W/l is among the highest in the database, significantly enhancing UAV battery pack design. Additionally, the maximum continuous discharge rate of 60 A and a maximum continuous charge rate of 13.2 A ensure robust performance under demanding conditions.
Application Challenges
In EVTOL applications, safety and risk management are paramount, particularly concerning overheating and thermal runaway during flight. The Enpower Greentech 21700-4.5Ah cell addresses these challenges effectively. With its high energy density, it supports extended flight times, crucial for UAVs operating in extreme environments. The ability to manage thermal conditions is vital; thus, the cell's design incorporates features that mitigate risks associated with high discharge rates and prolonged use. The nominal capacity of 15.84 Wh allows for reliable performance, ensuring that drones can complete their missions without the risk of battery failure due to overheating.
Why this Cell
The Enpower Greentech 21700-4.5Ah cell is specifically designed for UAV applications, offering a maximum continuous discharge rate of 60 A, which is top-quartile compared to the median of 30 A in the database. This capability is essential for high discharge rate UAV batteries, ensuring that drones can perform demanding tasks without compromising safety. The cell's volumetric energy density of 619 Wh/l, which is +14% vs the database median, allows for lightweight drone battery packs that do not sacrifice performance. This makes it an ideal choice for custom UAV battery packs, where weight and energy efficiency are critical.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in selecting the right battery cell for UAV applications. By modelling load profiles, thermal rise, voltage sag, and usable energy, engineers can predict how the Enpower Greentech 21700-4.5Ah cell will perform under various conditions. For instance, simulations can assess the thermal behaviour of the cell during high discharge scenarios, ensuring that overheating is effectively managed. This predictive capability allows for informed decision-making, reducing the risk of mid-air failures and enhancing overall mission reliability. By using cell-specific data, designers can optimise battery thermal management for drones, ensuring that the UAV can operate safely and efficiently across its entire flight envelope.
