Samsung 25S 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 25S cell for fast charging applications, designed to prevent overheating and ensure safety in UAV and drone battery systems.
Value Propositions
Cylindrical 18650 form factor for compact design.
Nominal capacity of 9.125 Wh and 2.45 Ah for reliable energy delivery.
Top-quartile volumetric energy density of 526 Wh/l for efficient space use.
Maximum continuous discharge of 35 A, ensuring high performance under load.
Gravimetric power density of 2,681 W/kg, ideal for rapid energy demands.
About the Cell
The Samsung 25S cell features a cylindrical 18650 form factor, providing a nominal capacity of 9.125 Wh and 2.45 Ah. With a volumetric energy density of 526 Wh/l, it is among the highest in the database, offering efficient energy storage for compact applications. The gravimetric energy density stands at 194 Wh/kg, which is around the median compared to other cells. Additionally, the cell boasts a volumetric power density of 7,266 W/l, placing it in the top-quartile category, and a gravimetric power density of 2,681 W/kg, which is also in the top-quartile range. These metrics make the Samsung 25S an excellent choice for applications requiring high energy and power density, particularly in UAV and drone systems.
Application Challenges
In the context of EVTOL and fast charging, the Samsung 25S cell addresses critical challenges associated with rapid energy delivery. Fast charging is essential for maintaining operational efficiency in drone applications, particularly in scenarios where downtime must be minimised. The risk of overheating and lithium plating during rapid charging poses significant challenges. The Samsung 25S is engineered to mitigate these risks, ensuring that the cells remain within safe thermal limits while delivering high current. This is crucial for extending drone flight time and improving UAV mission endurance, as overheating can lead to battery degradation and safety hazards.
Why this Cell
The Samsung 25S cell is particularly suited for fast charging applications due to its high maximum continuous discharge rate of 35 A, which supports rapid energy transfer without compromising safety. This performance is complemented by its top-quartile volumetric power density of 7,266 W/l, allowing for efficient energy delivery during critical flight phases. The cell's design also prioritises thermal management, which is vital for preventing overheating during fast charge cycles. Compared to the database median, the Samsung 25S's gravimetric power density is +127% higher, making it an ideal choice for UAV battery optimisation and custom UAV battery packs.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in optimising the performance of the Samsung 25S cell in fast charging applications. By modelling load profiles, thermal behaviour, and voltage response, engineers can predict how the cell will perform under various conditions. This allows for the identification of optimal charging strategies that prevent overheating and ensure safe operation. For instance, simulations can help determine the maximum safe charge current, minimising the risk of lithium plating. By accurately predicting the usable energy and thermal rise during operation, designers can confidently select the Samsung 25S for demanding UAV applications, ensuring reliability and efficiency.
