BAK 45D Weight v power trade off in pack design - how to pick the right balance.
Discover the BAK 45D cell for UAV applications, optimising weight and power for enhanced drone performance and endurance.
Value Propositions
Cylindrical 21700 form factor for compact design.
Nominal capacity of 15.84 Wh and 4.4 Ah for reliable energy supply.
Top-quartile volumetric energy density of 619 Wh/l for efficient space usage.
Maximum continuous discharge of 60 A, ensuring high power output.
Gravimetric power density of 3130 W/kg, ideal for demanding UAV applications.
About the Cell
The BAK 45D cell features a cylindrical 21700 form factor, providing a nominal capacity of 15.84 Wh and 4.4 Ah. With a volumetric energy density of 619 Wh/l, it ranks in the top-quartile compared to the database median of 541 Wh/l. Its gravimetric energy density of 229.57 Wh/kg is around the median, ensuring a good balance between weight and energy. The cell also boasts a maximum continuous discharge of 60 A, which is significantly higher than the median of 30 A, making it suitable for high-demand applications. Additionally, its volumetric power density of 8447 W/l is among the highest in the database, providing excellent performance for UAVs.
Application Challenges
In the EVTOL sector, the weight versus power trade-off is crucial for effective pack design. UAVs require batteries that not only provide sufficient energy but also maintain a lightweight profile to enhance flight efficiency. The BAK 45D cell addresses these challenges by offering a high energy density, which is essential for extending flight times and improving overall mission endurance. The ability to manage weight while ensuring high power output is vital for applications such as drone battery design and UAV battery pack design, where performance and reliability are paramount.
Why this Cell
The BAK 45D cell is an excellent choice for UAV applications due to its impressive specifications. Its maximum continuous discharge of 60 A, which is double the median of 30 A, allows for high-performance applications that require rapid energy delivery. Furthermore, its volumetric energy density of 619 Wh/l is in the top-quartile compared to the median of 541 Wh/l, making it ideal for lightweight drone battery packs. This cell's combination of high energy and power density ensures that it meets the demanding requirements of drone battery cell selection and UAV battery optimisation.
How Model-Based Design Helps
Simulation and model-based design play a crucial role in optimising battery performance for UAV applications. By modelling load profiles, thermal behaviour, and voltage response, engineers can accurately predict how the BAK 45D cell will perform under various conditions. This approach allows for the selection of the most suitable cell for specific mission profiles, ensuring that the weight versus power trade-off is effectively managed. For instance, simulations can help identify the optimal charge and discharge rates, ensuring that the battery operates efficiently without overheating. This predictive capability is essential for improving UAV mission endurance and preventing battery failures during critical operations.
