Samsung 25R: Weight v power trade off in pack design - how to pick the right balance.
Explore the Samsung 25R cell for UAV applications, balancing weight and power for optimal drone performance and endurance.
Value Propositions
Cylindrical 18650 form factor for versatile applications.
Nominal capacity of 9.0 Wh and 2.5 Ah for reliable energy supply.
Top-quartile volumetric energy density of 526 Wh/l for compact designs.
Maximum continuous discharge of 20 A, ideal for high-demand UAVs.
Gravimetric energy density of 200 Wh/kg, supporting lightweight drone packs.
About the Cell
The Samsung 25R cell is a cylindrical 18650 battery with a nominal capacity of 9.0 Wh and 2.5 Ah, making it suitable for various UAV applications. Its volumetric energy density of 526 Wh/l places it in the top-quartile compared to the database median of 541.67 Wh/l, providing compact energy solutions for drone designs. The gravimetric energy density of 200 Wh/kg is around the median, ensuring a balance between weight and energy storage. With a maximum continuous discharge of 20 A, this cell supports high power demands, making it ideal for applications requiring quick bursts of energy. Additionally, the cell's volumetric power density of 4208 W/l is among the highest in the database, allowing for efficient energy delivery during operation. These characteristics make the Samsung 25R a strong candidate for UAV battery pack design, particularly in applications where weight and power trade-offs are critical.
Application Challenges
In the context of EVTOL and the weight versus power trade-off in pack design, selecting the right battery is crucial. UAVs often face challenges related to energy consumption and flight duration, where the balance between battery weight and power output can significantly impact performance. For instance, a lightweight drone battery pack can enhance flight time, but it must also provide sufficient power for take-off and sustained flight. The Samsung 25R's specifications, including its high energy density and discharge capabilities, address these challenges effectively. By optimising battery selection, UAV manufacturers can ensure that their drones achieve longer endurance and improved mission reliability, especially in demanding environments.
Why this Cell
The Samsung 25R cell is particularly suited for UAV applications due to its impressive specifications. With a maximum continuous discharge of 20 A, it meets the high discharge rate requirements for UAVs, ensuring that drones can perform demanding tasks without compromising safety. The cell's volumetric energy density of 526 Wh/l is advantageous for compact UAV designs, allowing for more efficient use of space. Compared to the database median, this cell's performance is top-quartile, providing a competitive edge in the market. Furthermore, the gravimetric energy density of 200 Wh/kg ensures that the battery remains lightweight, which is essential for enhancing flight time and overall UAV efficiency. These features make the Samsung 25R an excellent choice for custom UAV battery packs, where performance and weight are critical considerations.
How Model-Based Design Helps
Simulation and model-based design play a vital role in optimising battery selection for UAV applications. By simulating load profiles and thermal behaviour, engineers can predict how the Samsung 25R cell will perform under various conditions. This includes modelling voltage sag during high discharge scenarios and assessing the usable energy throughout the flight envelope. Such simulations enable designers to make informed decisions about battery pack configurations, ensuring that the selected cells meet the specific demands of the mission. For example, understanding the thermal rise associated with high current draws can prevent overheating and extend battery life. Additionally, accurate predictions of state of charge (SoC) help in planning missions effectively, ensuring that UAVs can complete their tasks without mid-air failures. Overall, simulation enhances the reliability and efficiency of UAV battery design, making it an indispensable tool in the development process.
