Battery Data Scientist / Molding Developer (m/w/d)

Job Description

This is a Data Scientist role that also includes oversight of China-based third-party test labs and the associated data. You will manage the complete test process-from sample shipping to final reporting-to ensure standardized testing and data integrity, while developing physics‑based and data‑driven models that capture the electrochemical, degradation, and thermal behaviors of prismatic lithium‑ion cells.

• Develop electrochemical, degradation, and thermal models (physics-based + data-driven) for prismatic Li-ion cells.
  • Predict efficiency, impedance, degradation modes (SEI growth, Li-plating, LLI, LAM), and thermal behavior (heat generation, temperature rise)
  • Validate models using calendar aging, cycle aging, ARC, and other real test data
  • Design experimental plans to collect training/validation data
  • Analyze test and field data using Python and Excel
  • Build high-fidelity models to support simulation-driven design
  • Collaborate with engineering, data science, and analytics teams to integrate and optimize models
• Manage end-to-end testing process at 3rd-party labs in China: PO creation, sample shipping, fixture installation, progress tracking, data analysis, and cross-functional result sharing
  • Improve testing procedures and establish data reliability validation mechanisms
  • Analyze capacity, RTE, and other data; perform horizontal/vertical comparisons
  • Support BMS/Modeling teams on special condition tests and provide feedback

What does a qualified candidate bring to Fluence?

Here at Fluence, we strive to continuously improve, be intellectually curious and be adaptive to our customers and employee's needs. Collaboration is key, both in our partnerships with our customers, and with each other. Fluence prioritizes the most critical efforts that allow for the greatest impact.

We are looking for an expert from battery cell industry (electrochemical), who also must be good at coding independently.

• Bachelor's degree and above in Electrochemistry, Chemical Engineering, Electrical, Material Science, Data Science, or a related field.
• 3+ years' experience in battery cell testing, quality management, and/or battery modeling/data analytics.
• Proficiency with PyBaMM (Python Battery Mathematical Modelling library).
• Strong understanding of cell internal parameters - positive electrode, negative electrode, separator, electrolyte, etc.
• Basic understanding of electrochemical models of varying complexity (e.g., Single Particle Model (SPM), SPMe, Pseudo‑2‑Dimensional (P2D)), as well as degradation and thermal pathways.
• Familiarity with battery testing methods and protocols (e.g., HPPC, EIS, cycle life, calendar aging, ARC).
• Ability to analyze abnormal test results (capacity, impedance, RTE, etc.) and propose corrective actions.
• Excellent written and verbal English skills.
• Strong organizational and communication skills.
• Self‑driven, proactive, and able to take ownership of projects.
• Ability to travel up to 30% of time.

Our Culture

At Fluence, our culture is the foundation that drives our ambitious growth strategy and fuels our mission to transform the future of energy. Our core cultural pillars empower us to innovate, collaborate, and lead with purpose, ensuring we continue to deliver unparalleled value to our customers and the world.

Unleash Voices

We believe every voice matters. We encourage openness, active listening, and decisive action to create a culture where everyone has the opportunity to contribute to our success. We foster an environment where diverse perspectives are heard and valued, driving innovation and progress.

Customer Fluent

Our customers are at the heart of everything we do. We're committed to delivering exceptional value that exceeds expectations by understanding our customers' needs and adapting swiftly to meet them. Our deep focus on customer satisfaction drives us to continuously improve and innovate.

Infinite Impact

We are committed to creating the impossible. We push boundaries to deliver sustainable, game-changing solutions that shape a brighter, more energy-efficient future for all. Our team is passionate about making a lasting impact that will resonate for generations to come.

All In

We are all in for growth. Our teams are relentlessly focused on identifying and seizing opportunities that propel us forward. We embrace an ownership mindset, pushing ourselves and each other to accelerate progress and create lasting success.