Strength analysis of aluminum battery frames: providing durability and safety in EV applications.

At Endego, we provide advanced physics and engineering knowledge and experience, supported by CAE virtual validation tools that help overcome such challenges by applying cutting-edge Finite Element analyses and structural and thermal optimization techniques. In collaboration with a Client, Endego’s engineering team recently conducted a comprehensive strength analysis of an aluminum battery frame and guaranteed that it meets the stringent performance and safety requirements of modern electric vehicles (EVs).

Project challenge: evaluate battery strength under swelling cell pressure

The Client approached Endego with a key concern: evaluate the structural strength of an aluminum battery frame subjected to pressure from swelling battery cells and determine the forces acting on the battery box mounting points.

Battery cells expand and contract during charge and discharge cycles, and generate internal stresses that can affect the integrity of the battery frame. The purpose of the task was to:

• Assess the stress and deformation behavior of the aluminum frame under swelling load.
• Determine the forces at the mounting points and ensure proper load distribution.
• Verify the overall structural stability of the battery housing over extended time, with operational cycles.

Given the nonlinear behavior of materials used for battery housings, a precise and detailed simulation by the Finite Element Method (FEM) was required to capture real-world performance and optimize the design accordingly.

Our approach: advanced FE simulations & structural analyses

To address the Client’s requirements, the Endego CAE Virtual Validation team developed a high-fidelity FE model of the battery frame, which accurately represents its connections, material properties, and loading conditions.

Key steps in the analysis:

1. Nonlinear FE model creation:
   • A detailed simulation model of the aluminum battery frame was developed.
   • Nonlinear material properties have been applied for realistic stress-strain behavior modelling under thermal loads.
2. Assessment of stress and deformation states:
   • The model was subjected to internal pressure from swelling battery cells. The resulting stress distribution, deformation levels, and failure risks have been analyzed.
   • Stress concentration locations had been identified. Design improvements have taken them into account to mitigate the risks of such potential weak points.
3. Evaluation of forces at battery box mounting points
   • Together with the Client’s team, Endego engineers have precisely determined forces in the mounting points.
   • Then, the mounting system design was optimized for enhanced structural reliability.

This multi-faceted approach ensured that the battery frame design would withstand operational stresses while maintaining lightweight efficiency, a crucial factor in EV battery development.

Project outcome: reliable and scalable battery frame design

The optimized battery frame, as analyzed and verified by Endego engineering team, provides long-term safety and failure-free operation. The key benefits for the Client include:

• Reliable and durable battery housing that ensures safe operation over multiple charging cycles.
• Expansion of the range of large-format batteries was made possible; production of more complex battery structures was now enabled.
• Partnership growing with leading EV manufacturers; the Client’s position in the electric vehicle market was established.

Endego leveraged virtual validation and helped the Client enhance battery frame reliability, reduce development risks, and meet stringent safety regulations.

At Endego, we specialize in structural, thermal, dynamic, and nonlinear analysis for battery systems, electric vehicles, and lightweight structures. Our expertise in FE modeling, CAE virtual validation, and material optimization helps manufacturers build safer and more efficient energy storage devices.

If your company is looking for engineering support in battery pack design, lightweight material analysis, or structural integrity assessments, contact us today! Our team is ready to help you develop next-generation battery systems that drive innovation in EV technology.

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