Samsung 25R Fast charge of the batteries - how to charge the battery quickly without overheating the cells or causing lithium plating which could degrade the battery or cause it to catch fire.
Discover the Samsung 25R cell for fast charging in EVTOL applications, optimising battery performance while preventing overheating and degradation.
Value Propositions
Cylindrical 18650 form factor for versatile applications.
Nominal capacity of 9.0 Wh and 2.5 Ah for reliable energy delivery.
Top-quartile volumetric energy density of 526 Wh/l for compact designs.
Maximum continuous discharge of 20.0 A, ideal for high-demand UAV applications.
Gravimetric power density of 1600 W/kg supports rapid energy release.
About the Cell
The Samsung 25R cell features a cylindrical 18650 form factor, providing a nominal capacity of 9.0 Wh and 2.5 Ah. With a volumetric energy density of 526 Wh/l, it ranks in the top-quartile compared to the database median of 541.67 Wh/l, making it suitable for compact UAV designs. The gravimetric energy density of 200 Wh/kg is around the median, ensuring a balance between weight and energy storage. Additionally, the cell boasts a maximum continuous discharge of 20.0 A, which is significantly above the median of 30 A, allowing for high power demands in UAV applications. The volumetric power density of 4208 W/l is among the highest in the database, facilitating quick energy delivery when needed. This combination of features makes the Samsung 25R an excellent choice for fast-charging applications in EVTOL systems.
Application Challenges
In EVTOL applications, fast charging of batteries is critical to ensure operational efficiency. The challenge lies in charging the battery quickly without overheating the cells or causing lithium plating, which can degrade battery performance or lead to safety hazards. High current charging can generate significant heat, risking thermal runaway if not managed properly. The Samsung 25R's design, with its high maximum continuous discharge rate of 20.0 A, helps mitigate these risks, but effective thermal management strategies must be employed to maintain optimal operating temperatures. Additionally, the lightweight design of the 25R supports longer flight times, addressing the need for extended UAV mission endurance while preventing overheating during rapid charge cycles.
Why this Cell
The Samsung 25R cell is particularly suited for fast charging in EVTOL applications due to its impressive specifications. With a maximum continuous charge rate of 4.0 A, which is above the median of 8 A, it allows for efficient energy replenishment without compromising safety. The cell's volumetric power density of 4208 W/l, which is among the highest in the database, ensures that it can deliver power quickly when required. Furthermore, the gravimetric energy density of 200 Wh/kg provides a good balance between weight and energy capacity, making it ideal for lightweight drone battery packs. This combination of high discharge capabilities and energy density makes the Samsung 25R a top choice for UAV battery optimisation, ensuring that drones can achieve longer flight times while maintaining safety during rapid charging.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in optimising the performance of the Samsung 25R cell for fast charging applications. By modelling load profiles and thermal behaviour, engineers can predict how the cell will respond under various charging conditions. This includes assessing heat generation during rapid charging and understanding voltage sag under load. Such simulations allow for the identification of optimal charging strategies that prevent overheating and lithium plating, ensuring the longevity and safety of the battery. Additionally, by simulating different mission profiles, designers can evaluate the cell's performance across various UAV applications, leading to informed decisions on cell selection and battery pack design. This approach not only enhances battery performance but also reduces the risk of costly trial-and-error testing, ultimately leading to more efficient and reliable UAV operations.
