Molicel P42A Drones 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 P42A cell for drones, designed for fast charging without overheating. Ideal for UAV battery pack design and optimisation.
Value Propositions
Cylindrical 21700 form factor for efficient space utilisation.
Nominal capacity of 15.12 Wh and 4.2 Ah for reliable energy delivery.
Top-quartile volumetric power density of 6,434 W/l for rapid energy transfer.
Gravimetric energy density of 216 Wh/kg, ensuring lightweight drone battery packs.
Maximum continuous discharge of 45 A, supporting high discharge rate UAV batteries.
About the Cell
The Molicel P42A is a cylindrical 21700 cell with a nominal capacity of 15.12 Wh (4.2 Ah). It boasts a volumetric energy density of 600 Wh/l and a gravimetric energy density of 216 Wh/kg. This cell is designed for high performance, featuring a maximum continuous discharge rate of 45 A, which is in the top-quartile compared to the median of 30 A in the database. Additionally, its volumetric power density of 6,434 W/l is among the highest in the database, making it ideal for applications requiring rapid energy transfer. The cell's design ensures it can handle the demands of drone applications, particularly in fast charging scenarios.
Application Challenges
In the context of drones, fast charging presents unique challenges. The need to charge batteries quickly without overheating or causing lithium plating is critical. Overheating can lead to battery degradation or even catastrophic failure, while lithium plating can significantly reduce the battery's lifespan and performance. Therefore, selecting the right cell, such as the Molicel P42A, which has a high maximum continuous charge rate of 8.4 A (2 C), is essential for ensuring safe and efficient charging. The ability to manage thermal performance while maintaining high energy output is crucial for extending drone flight times and improving overall mission endurance.
Why this Cell
The Molicel P42A is particularly suited for drone applications due to its impressive specifications. With a maximum continuous discharge rate of 45 A, it supports high discharge rate UAV batteries, allowing for robust performance during demanding flight conditions. Its volumetric energy density of 600 Wh/l is significantly above the median of 542 Wh/l in the database, ensuring that drones can carry more energy without increasing weight. This cell's design also facilitates effective thermal management, crucial for preventing overheating during fast charging, making it an excellent choice for UAV battery pack design.
How Model-Based Design Helps
Simulation and model-based design play a vital role in optimising battery performance for drone applications. By simulating load profiles and thermal behaviour, engineers can predict how the Molicel P42A will perform under various conditions. This includes assessing voltage sag and usable energy across different flight scenarios. Such modelling allows for informed decisions when selecting cells, ensuring that the chosen battery can meet the specific demands of the mission profile. For instance, understanding the thermal rise during rapid charging can help in designing battery packs that prevent overheating, thereby enhancing safety and reliability in the field.
