EVE Energy 40PL: Weight v power trade off in pack design - how to pick the right balance.
Explore the EVE Energy 40PL cell for UAV applications, balancing weight and power for optimal drone performance and endurance.
Value Propositions
Cylindrical 21700 form factor for efficient design.
Nominal capacity of 14.4 Wh and 4.0 Ah for reliable performance.
Top-quartile volumetric energy density of 578 Wh/l for compact designs.
Maximum continuous discharge of 70 A for high-demand applications.
Gravimetric power density of 3761 W/kg, ideal for UAV efficiency.
About the Cell
The EVE Energy 40PL cell features a cylindrical 21700 form factor, providing a nominal capacity of 14.4 Wh and 4.0 Ah. With a volumetric energy density of 578 Wh/l, it ranks in the top-quartile compared to the median of 542 Wh/l in the database. The gravimetric energy density stands at 215 Wh/kg, which is around the median of 210 Wh/kg. Additionally, the cell boasts a volumetric power density of 10108 W/l, which is among the highest in the database, and a gravimetric power density of 3761 W/kg, also among the highest. The standard charge current is 2.0 A, with a maximum continuous charge of 8.0 A, and a maximum continuous discharge of 70.0 A, making it suitable for demanding UAV applications.
Application Challenges
In the context of EVTOL and the weight versus power trade-off in pack design, selecting the right battery cell is crucial. The EVE Energy 40PL cell addresses the challenge of optimising battery weight while ensuring sufficient power output for UAVs. High energy density is vital for extending flight times, especially in applications requiring long endurance, such as surveillance or delivery. The ability to manage thermal performance is also critical, as overheating can lead to battery failure. Therefore, understanding the balance between weight and power is essential for achieving optimal UAV performance.
Why this Cell
The EVE Energy 40PL cell is an excellent choice for UAV applications due to its impressive specifications. With a maximum continuous discharge of 70 A, it provides the necessary power for high-demand scenarios, making it suitable for heavy-lift drones. The volumetric energy density of 578 Wh/l ensures that the cell can deliver significant energy without adding excessive weight, which is crucial for maintaining flight efficiency. Compared to the median volumetric energy density of 542 Wh/l, the 40PL cell offers a top-quartile performance, making it a strong candidate for UAV battery pack design.
How Model-Based Design Helps
Simulation and model-based design play a critical role in selecting the right battery cell for UAV applications. By modelling load profiles, thermal behaviour, and voltage response, engineers can predict how the EVE Energy 40PL cell will perform under various conditions. For instance, simulating the thermal rise during high discharge scenarios allows for the identification of potential overheating issues, ensuring that the cell can operate safely within its limits. Additionally, modelling usable energy helps in understanding the effective capacity of the cell during flight, enabling better mission planning and execution. This approach reduces the risk of failure and enhances overall UAV reliability.
