Molicel P26A 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 Molicel P26A cell, designed for fast charging in EVTOL applications. Learn how it meets challenges without overheating or degrading.
Value Propositions
Cylindrical 18650 form factor for compact designs.
Nominal capacity of 9.0 Wh, ideal for UAV applications.
Top-quartile power density (+58% vs median W/kg) for brisk current draws.
Maximum continuous discharge of 35.0 A, suitable for demanding tasks.
Volumetric energy density of 508 Wh/l, enhancing flight efficiency.
About the Cell
The Molicel P26A is a cylindrical 18650 lithium-ion cell with a nominal capacity of 9.0 Wh and 2.5 Ah. It boasts a volumetric energy density of 508 Wh/l, which is around the median for high-performance cells. The gravimetric energy density is 188 Wh/kg, which is below the median of 210 Wh/kg. However, its volumetric power density is impressive at 7111 W/l, placing it among the highest in the database, exceeding the median of 2029 W/l by +250%. The maximum continuous discharge rate is 35.0 A, which is top-quartile compared to the median of 30 A. This cell is designed for applications requiring rapid charging and high energy output, making it suitable for UAVs and drones.
Application Challenges
In EVTOL applications, fast charging is critical to ensure drones can operate efficiently without overheating or causing lithium plating. The challenge lies in managing the thermal dynamics of the battery during rapid charge cycles. High charge rates can lead to increased temperatures, which may degrade the cell's performance or safety. The Molicel P26A addresses these challenges with its robust design, allowing for a maximum continuous charge of 6.0 A (2.4 C-rate), which is essential for maintaining thermal stability while achieving quick recharge times. The ability to charge rapidly without compromising safety is vital for mission-critical UAV operations.
Why this Cell
The Molicel P26A cell is particularly suited for EVTOL applications due to its high volumetric power density of 7111 W/l, which allows for quick energy delivery during demanding flight profiles. Its maximum continuous discharge rate of 35.0 A ensures that it can handle the high current demands typical in UAV operations. Compared to the median of 30 A, this performance is top-quartile, providing confidence in its ability to support high-energy tasks. Additionally, the cell's volumetric energy density of 508 Wh/l enhances the overall efficiency of drone operations, allowing for longer flight times and reduced weight in battery packs.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in optimising the performance of the Molicel P26A in UAV applications. By modelling load profiles and thermal behaviour, engineers can predict how the cell will perform under various conditions, including rapid charging scenarios. This predictive capability allows for the selection of the most suitable cells for specific missions, ensuring that the battery can deliver the required thrust and energy without overheating. By simulating voltage sag and usable energy, designers can make informed decisions that enhance battery thermal management and overall UAV efficiency, ultimately leading to improved mission success rates.
