Prototypical 21700 lithium-ion battery cells with aluminum case
Develop fully functional 21700 cylindrical battery cells with aluminum alloy cases to demonstrate technical feasibility and performance advantages over traditional steel cases.
Overview
This project focuses on the development and validation of 21700 lithium-ion battery cells utilizing innovative aluminum alloy casings. The objective is to demonstrate the potential performance and feasibility advantages of aluminum over traditional steel casings in battery applications. This solution aims to enhance battery efficiency, reduce weight, and improve durability, making it an attractive option for various industries, including automotive and consumer electronics.
Technical specifications
The core technology involves integrating a pre-fabricated aluminum alloy case into fully functional 21700 cylindrical batteries. Key features include:
- Evaluation of cell charge/discharge behavior to ensure optimal performance
- Comprehensive thermal response analysis to prevent overheating
- Structural integrity assessments to confirm durability and reliability
These tests will help establish the aluminum casing's superior performance characteristics, including enhanced thermal management and reduced weight compared to steel.
Technology readiness level
This technology is currently at Technology Readiness Level 5, having been validated in a laboratory environment. The next steps involve further testing and optimization to advance towards full commercial deployment.
About Fraunhofer Institute
Fraunhofer is a large, multi-site applied research organization based in Germany, operating a nationwide network of institutes and research units with a strong industry-facing mission. Its contract-research model aligns work to real manufacturing and deployment needs, with pilot lines, test labs, and demonstration facilities for validation and scale-up. Many institutes are integrated with nearby universities and regional industry clusters, enabling joint appointments, shared infrastructure, and fast talent pipelines. Research is supported by competitive European programs alongside German federal and state funding, complemented by extensive contract revenue from private-sector collaborations. A dedicated technology transfer function manages IP, licensing, and startup formation.
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