Enpower Greentech 21700-4.5Ah 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 Enpower Greentech 21700-4.5Ah cell, designed for fast charging in EVTOL applications, ensuring safety and efficiency without overheating.
Value Propositions
Cylindrical 21700 form factor for versatile applications.
Nominal capacity of 15.84 Wh and 4.4 Ah for reliable energy delivery.
Top-quartile volumetric energy density of 619 Wh/l for compact designs.
Maximum continuous discharge of 60 A, ensuring high performance.
Gravimetric power density of 3,130 W/kg, ideal for rapid energy demands.
About the Cell
The Enpower Greentech 21700-4.5Ah cell features a cylindrical form factor, making it suitable for various applications, particularly in EVTOL environments. With a nominal capacity of 15.84 Wh and 4.4 Ah, it provides reliable energy delivery. The cell boasts a volumetric energy density of 619 Wh/l, placing it in the top-quartile compared to the database median of 541.67 Wh/l, which allows for compact battery designs without sacrificing performance. Additionally, the maximum continuous discharge rate of 60 A ensures that the cell can handle high power demands, making it an excellent choice for applications requiring rapid energy delivery. The gravimetric power density of 3,130 W/kg further enhances its appeal, being significantly above the database median of 750 W/kg, which is crucial for applications where weight is a critical factor.
Application Challenges
In the EVTOL sector, fast charging of batteries is essential 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 or lead to catastrophic failures. High charge currents are necessary to reduce downtime, but they must be managed carefully to prevent thermal runaway. The Enpower Greentech 21700-4.5Ah cell, with its maximum continuous charge rate of 13.2 A, is designed to meet these challenges effectively. This capability allows for rapid recharging while maintaining safety standards, ensuring that UAVs can be deployed quickly and reliably. The cell's design also addresses the need for lightweight solutions, as every gram saved contributes to extended flight times and improved mission endurance.
Why this Cell
The Enpower Greentech 21700-4.5Ah cell is particularly well-suited for fast charging applications in EVTOL environments due to its impressive specifications. With a maximum continuous charge rate of 13.2 A, it allows for efficient energy replenishment, crucial for maintaining operational readiness. This rate is significantly higher than the database median of 8 A, making it a top-quartile performer in this regard. Additionally, the cell's volumetric energy density of 619 Wh/l ensures that it can store a substantial amount of energy in a compact form, which is essential for UAV applications where space is limited. The high gravimetric power density of 3,130 W/kg further supports rapid energy demands, making it an ideal choice for applications that require both high energy and power outputs without compromising safety.
How Model-Based Design Helps
Simulation and model-based design play a critical role in optimising the performance of the Enpower Greentech 21700-4.5Ah cell for EVTOL applications. By modelling load profiles, thermal rise, voltage sag, and usable energy, engineers can accurately predict how the cell will perform under various conditions. This approach allows for the identification of optimal charging strategies that prevent overheating and lithium plating, ensuring the longevity and safety of the battery. For instance, simulations can help determine the best charging currents and durations to maximise efficiency while minimising thermal risks. This predictive capability is invaluable in the design process, enabling manufacturers to select the most suitable cells for specific UAV applications, ultimately leading to enhanced performance and reliability.
