EVE Energy 25P EVTOL Weight v power trade off in pack design - how to pick the right balance.
Explore the EVE Energy 25P cell for EVTOL applications, optimising weight and power for drone battery design challenges. Discover its advantages.
Value Propositions
Cylindrical 18650 form factor for versatile integration.
Nominal capacity of 9.0 Wh, suitable for various UAV applications.
Top-quartile volumetric power density (+58% vs median 2,029 W/l) for efficient power delivery.
Gravimetric energy density of 187.5 Wh/kg, enhancing flight duration.
Maximum continuous discharge of 30.0 A, ideal for high-demand UAV operations.
About the Cell
The EVE Energy 25P cell features a cylindrical 18650 form factor, providing a nominal capacity of 9.0 Wh and a nominal charge capacity of 2.5 Ah. With a volumetric energy density of 516 Wh/l, it ranks around the median compared to other cells in the database. The gravimetric energy density is 187.5 Wh/kg, which is below the median but still competitive for lightweight drone applications. The cell boasts a volumetric power density of 6,200 W/l, placing it in the top-quartile category, and a gravimetric power density of 2,250 W/kg, which is also among the highest in the database. This combination of energy and power densities makes it a strong candidate for UAV battery pack design, especially in applications requiring a balance between weight and power output.
Application Challenges
In EVTOL applications, the weight versus power trade-off is critical. Designers must carefully select battery cells that provide sufficient energy density to extend flight times while maintaining a lightweight profile. The EVE Energy 25P cell's nominal capacity of 9.0 Wh is essential for achieving long endurance in drone operations. Additionally, the maximum continuous discharge rate of 30.0 A allows for high performance during demanding flight conditions. The challenge lies in optimising these parameters to prevent overheating and ensure safe operation, particularly in extreme environments. Accurate predictions of state of charge (SoC) and thermal management are vital to avoid mid-air failures and maximise mission success.
Why this Cell
The EVE Energy 25P cell is particularly suited for EVTOL applications due to its impressive specifications. With a volumetric power density of 6,200 W/l, it is in the top-quartile compared to the median of 2,029 W/l, allowing for efficient power delivery during critical flight phases. The cell's gravimetric energy density of 187.5 Wh/kg, while below the median, still supports lightweight designs essential for drone endurance. Furthermore, the maximum continuous discharge rate of 30.0 A ensures that the cell can handle high demand without compromising safety. This combination of features makes the 25P an excellent choice for custom UAV battery packs, where performance and reliability are paramount.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in optimising the selection of the EVE Energy 25P cell for UAV applications. By modelling load profiles and thermal behaviour, engineers can predict how the cell will perform under various conditions, including high discharge rates and temperature fluctuations. This approach allows for accurate assessments of usable energy and voltage sag, ensuring that the selected cell meets the specific requirements of the mission. For instance, simulating different flight scenarios can help identify the optimal balance between weight and power, ultimately leading to improved UAV performance and mission success. By leveraging cell-specific data, designers can avoid costly trial-and-error testing and confidently select the best battery for their drone applications.
