Reliance RS50 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 RS50, designed for fast charging in EVTOL applications, ensuring safety and performance without overheating or degradation.
Value Propositions
Cylindrical 21700 form factor for compact design.
Nominal capacity of 18.0 Wh and 5.0 Ah for reliable energy delivery.
Volumetric energy density of 715 Wh/l, top-quartile vs median 542 Wh/l.
Gravimetric power density of 3761 W/kg, among the highest in database.
Maximum continuous discharge of 70 A, top-quartile vs median 30 A.
About the Cell
The Reliance RS50 is a cylindrical 21700 cell with a nominal capacity of 18.0 Wh and 5.0 Ah, making it suitable for high-performance applications. With a volumetric energy density of 715 Wh/l, it ranks in the top-quartile compared to the database median of 542 Wh/l. The gravimetric energy density is 269 Wh/kg, which is significantly higher than the median of 210 Wh/kg. Additionally, the cell boasts a volumetric power density of 10008 W/l, which is among the highest in the database, ensuring it can deliver power efficiently. The maximum continuous discharge rate of 70 A positions it in the top-quartile compared to the median of 30 A, making it ideal for demanding applications such as UAVs and drones.
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 the battery or even lead to fire hazards. The RS50's high maximum continuous charge rate of 15 A (3.0 C) allows for rapid charging while maintaining safety. The cell's thermal management capabilities are essential in preventing overheating during fast charge cycles, ensuring that the battery remains within safe operating temperatures. This is particularly important in UAV applications where reliability and safety are paramount, especially in extreme environments.
Why this Cell
The Reliance RS50 is specifically designed to meet the challenges of fast charging in EVTOL applications. With a maximum continuous charge rate of 15 A, it allows for quick recharging without compromising safety. The cell's volumetric energy density of 715 Wh/l and gravimetric energy density of 269 Wh/kg ensure that it provides ample energy for extended flight times. Compared to the median values in the database, the RS50's performance is impressive, with a volumetric power density of 10008 W/l, which is among the highest available. This makes it an excellent choice for UAV battery pack design, where weight and energy efficiency are critical.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in optimising the performance of the Reliance RS50 in fast charging applications. By modelling load profiles and thermal behaviour, engineers can predict how the cell will perform under various conditions. This includes assessing heat generation during rapid charging and understanding voltage sag under load. Such simulations enable the selection of the most suitable cells for specific UAV missions, ensuring that the battery can deliver the required thrust and energy without overheating. This predictive capability is vital for mission-critical applications, allowing operators to make informed decisions about battery readiness and performance.
