Enpower Greentech 21700-4.5Ah Weight v power trade off in pack design - how to pick the right balance.
Explore the Enpower Greentech 21700-4.5Ah cell for UAV applications, balancing weight and power for optimal drone performance.
Value Propositions
Cylindrical 21700 form factor for compact design.
Nominal capacity of 15.84 Wh and 4.4 Ah for reliable energy supply.
Volumetric energy density of 619 Wh/l, top-quartile vs median.
Gravimetric power density of 3130 W/kg, among the highest in database.
Maximum continuous discharge of 60 A, ensuring robust performance.
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 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. The gravimetric energy density stands at 229.57 Wh/kg, which is around the median of 210 Wh/kg. This cell also boasts a volumetric power density of 8447.4 W/l, which is among the highest in the database, and a gravimetric power density of 3130.43 W/kg, significantly exceeding the median of 750 W/kg. The maximum continuous discharge rate of 60 A ensures that this cell can handle demanding applications, making it ideal for UAVs and drone battery designs.
Application Challenges
In the context of EVTOL applications, the weight versus power trade-off is critical for effective pack design. Drones require a careful balance between battery weight and the power output to achieve optimal flight times and performance. The challenge lies in selecting the right battery cells that can deliver high energy density while remaining lightweight. This is essential for long endurance drone batteries, where every gram counts towards the overall efficiency and capability of the UAV. The need for high discharge rates and reliable performance under varying conditions further complicates the design process, necessitating advanced battery thermal management and accurate state-of-charge (SOC) predictions.
Why this Cell
The Enpower Greentech 21700-4.5Ah cell is particularly suited for UAV applications due to its impressive specifications. With a maximum continuous discharge rate of 60 A, it supports high power demands, making it ideal for drone battery optimization. The volumetric energy density of 619 Wh/l positions it in the top-quartile compared to the median, ensuring that drones can achieve longer flight times without increasing weight. This cell's gravimetric power density of 3130 W/kg is among the highest in the database, allowing for efficient energy delivery during critical flight phases. These attributes make it a prime candidate for custom UAV battery packs, where performance and weight are paramount.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in optimising battery selection for UAV applications. By modelling load profiles, thermal behaviour, and voltage response, engineers can predict how the Enpower Greentech 21700-4.5Ah cell will perform under various conditions. This approach allows for accurate assessments of usable energy and thermal rise, ensuring that the selected cell meets the specific demands of the mission profile. For instance, simulating different flight scenarios can help identify the optimal discharge rates and energy consumption patterns, leading to more efficient drone battery pack designs. This predictive capability reduces the risk of mid-air failures and enhances overall mission reliability, making it an invaluable tool in the UAV battery design process.
