Reliance RS40 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 Reliance RS40 battery for fast charging applications in EVTOLs. Overcome overheating and lithium plating challenges with advanced technology.
Value Propositions
Cylindrical 21700 form factor for efficient design.
Nominal capacity of 14.4 Wh and 4.0 Ah for reliable performance.
Top-quartile volumetric power density of 10,008 W/l for rapid energy delivery.
Gravimetric energy density of 215 Wh/kg, ideal for lightweight UAV applications.
Maximum continuous discharge of 70 A, supporting high-performance UAV operations.
About the Cell
The Reliance RS40 battery features a cylindrical 21700 form factor, providing a nominal capacity of 14.4 Wh and 4.0 Ah. With a volumetric energy density of 572 Wh/l, it ranks among the highest in the database, surpassing the median of 542 Wh/l by +5%. The gravimetric energy density stands at 215 Wh/kg, which is around the median of 210 Wh/kg. The battery also boasts a volumetric power density of 10,008 W/l, placing it in the top-quartile compared to the median of 2,029 W/l, with a significant +392% improvement. Additionally, the gravimetric power density is 3,761 W/kg, which is also in the top-quartile, exceeding the median of 750 W/kg by +402%. With a standard charge current of 4.0 A and a maximum continuous charge of 14.0 A, the RS40 is designed for efficient charging. The maximum continuous discharge current of 70.0 A allows for high-performance applications, making it suitable for demanding UAV operations.
Application Challenges
In the EVTOL sector, 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 the battery and pose safety risks. The RS40's high discharge rate of 70 A enables rapid energy delivery, essential for maintaining UAV performance during demanding missions. Additionally, the battery's thermal management capabilities are crucial in preventing overheating, ensuring that the cells remain within safe operating temperatures during fast charging. This is particularly important in applications where extended flight times are required, as overheating can lead to reduced battery life and performance.
Why this Cell
The Reliance RS40 is an ideal choice for EVTOL applications due to its impressive specifications. With a maximum continuous discharge of 70 A, it supports high-performance UAV operations, making it suitable for demanding applications. The battery's volumetric power density of 10,008 W/l is among the highest in the database, providing rapid energy delivery essential for fast charging. Furthermore, the gravimetric energy density of 215 Wh/kg ensures that the battery remains lightweight, which is crucial for UAV efficiency. These features combined make the RS40 a reliable option for fast charging without compromising safety or performance.
How Model-Based Design Helps
Simulation and model-based design play a vital role in optimising battery performance for UAV applications. By modelling load profiles, thermal rise, voltage sag, and usable energy, engineers can accurately predict how the Reliance RS40 will perform under various conditions. This approach allows for the selection of the most suitable battery cells based on real-world scenarios, ensuring that the chosen cell meets the specific demands of fast charging applications. For instance, simulating the thermal behaviour of the RS40 during rapid charging can help identify potential overheating issues, enabling engineers to implement effective thermal management strategies. This predictive capability reduces the risk of failure and enhances the overall reliability of UAV operations.
