Lishen 2170LH 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.
Explore the Lishen 2170LH cell for fast charging in EVTOL applications, overcoming overheating and lithium plating challenges for optimal performance.
Value Propositions
Cylindrical 21700 form factor for efficient design.
Nominal capacity of 10.8 Wh and 3.0 Ah for reliable energy storage.
Top-quartile volumetric power density of 6049 W/l for rapid energy delivery.
Maximum continuous discharge of 45 A (15 C) for high-performance applications.
Gravimetric energy density of 152 Wh/kg for lightweight UAV battery packs.
About the Cell
The Lishen 2170LH cell features a cylindrical 21700 form factor, providing a nominal capacity of 10.8 Wh and 3.0 Ah. With a volumetric energy density of 403 Wh/l, it is designed for high energy applications. The cell boasts a volumetric power density of 6049 W/l, placing it in the top-quartile compared to the median of 2029 W/l in the database. Additionally, it has a gravimetric energy density of 152 Wh/kg, which is around the median of 210 Wh/kg. The maximum continuous discharge rate of 45 A (15 C) allows for robust performance in demanding scenarios, making it suitable for fast charging applications in EVTOL systems. The cell's mass is 71 g, and it occupies a volume of 26.78 litres, ensuring a compact design without compromising on performance.
Application Challenges
In EVTOL applications, fast charging of batteries is critical to ensure operational efficiency and safety. The challenge lies in charging the battery quickly without overheating the cells or causing lithium plating, which can degrade the battery's performance and pose safety risks. High charge currents are necessary to achieve rapid charging, but they must be managed carefully to prevent thermal runaway. The Lishen 2170LH cell's maximum continuous charge rate of 30 A (10 C) allows for efficient charging while maintaining thermal stability, addressing the core challenge of balancing speed and safety in UAV battery pack design.
Why this Cell
The Lishen 2170LH cell is an excellent choice for fast charging in EVTOL applications due to its impressive specifications. With a maximum continuous discharge rate of 45 A (15 C), it is well-suited for high discharge rate UAV batteries, ensuring that the drone can perform under demanding conditions. The cell's volumetric power density of 6049 W/l is among the highest in the database, providing rapid energy delivery essential for fast charging. Additionally, its gravimetric energy density of 152 Wh/kg allows for lightweight drone battery packs, enhancing overall UAV performance. This combination of high energy and power density makes the Lishen 2170LH an ideal candidate for custom UAV battery packs.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in optimising the performance of the Lishen 2170LH cell for EVTOL applications. By modelling load profiles, thermal rise, voltage sag, and usable energy, engineers can accurately predict how the cell will behave under various conditions. This approach allows for the selection of the most suitable cells for specific missions, ensuring that the UAV can achieve its performance goals without risking battery failure. For instance, simulations can help identify the optimal charge current that maximises efficiency while preventing overheating, thus supporting safe and reliable operation in the field. Furthermore, these models can be used to test different scenarios, such as varying temperatures and states of charge (SoC), to ensure that the battery performs reliably across its entire operational envelope.
