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Battery Intelligence Engineer
Rimac Automobili
Source: Headcount Labs · original listing ↗
Job data: Headcount Labs, ODbL 1.0. Job descriptions belong to their employers.
Posted Oct 13
About this role
About us Rimac Energy is the energy storage division of Rimac Group, the Croatian technology company behind the world's fastest electric hypercar and industry-leading EV powertrain technology. Rimac Energy applies that same performance engineering to grid-scale battery storage, developing the SineStack Battery Energy Storage System (BESS) alongside an in-house Battery Management System and Battery Intelligence software platform. Headquartered in Zagreb with a manufacturing and innovation site in Witney, UK, the team is scaling fast as it moves from pilot deployments into full-scale European manufacturing. The Role We're looking for a Battery Intelligence Engineer to own how we understand our cells, from selecting and testing them, to analysing how they perform and age in the field. You'll be a hands-on engineer, just as comfortable with the physical testing of cells as you are when delving into the data. The role requires knowledge of the technical performance aspects of lithium-ion batteries, from understanding the requirements around selecting appropriate cells for a product, to knowing how to validate our advanced SoC and SoH algorithms on a real system. Key Responsibilities Cell Testing & Selection • Engage with cell suppliers on their latest offerings and future cell roadmaps, shortlisting candidate cells for testing. • Plan and run cell testing, covering all different aspects of performance from electrical, mechanical, thermal, ageing, and safety. • Recommendations of which cell to select for each product, backed by the test data and the needs of the project. Data Analysis • Analysis of cell test data and the generation of test reports to highlight a cell’s performance characteristics. • Tracking selected cells through module and rack build, reviewing the build and test data at each stage to ensure consistent and predictable performance. • Follow the cell's operation in the field, using fleet data to spot trends in performance, safety and ageing. Algorithm Validation • Create test plans to validate our algorithms and models, across embedded, edge, and cloud. • Design test rigs to validate our cells and modules in unique ways to mimic the real-world environment and not just a static lab. • Lead data generation and analysis, comparing results against model outputs and flagging where they diverge. • Support degradation assessments and lifetime optimisation. Technical Expertise • Act as a technical expert on current and future lithium-ion battery technology. • Consult with stakeholders on the impact of the BESS design on the performance of the cell. What We're Looking For • Engineering or STEM degree (Bachelor's or Master's), or equivalent experience. • Strong knowledge of lithium-ion cell behaviour, including performance, safety and ageing. • Hands-on battery testing experience, including test equipment and data acquisition. • Experience designing and building test rigs. • Python and/or MATLAB for analysing test and field data. • Understanding of how SoC and SoH estimation works and how to validate it on real products. • Clear communication and a collaborative, cross-functional working style. Nice to have • Experience working directly with cell suppliers on cell selection. • Exposure to module or rack build and integration. • Knowledge of battery safety standards and regulations. • Python data engineering experience. • PhD or research-level background in electrochemistry or battery physics. What Rimac Energy Offers • The chance to shape the battery intelligence behind SineStack as it scales into full European manufacturing. • A fast-paced, engineering-driven culture where practical problem-solving and initiative are genuinely valued. • An educational budget and continuous development, with exposure to rapidly evolving energy and power electronics technology. • 26 days' annual leave plus 8 public holidays. • 10 days' fully paid sick leave and 5 days' paid marriage leave. • 4 months' paid maternity leave and 2 weeks' paternity leave. • Company pension scheme with auto-enrolment. • AXA and Medicash private medical insurance for you and your immediate family. • Service awards, a remote working day by agreement, and a pet-friendly office with relaxation zones and daily fresh fruit. How to Apply Submit a CV and a brief cover note outlining relevant battery testing, model validation or analytics experience. Rimac Energy is an equal opportunity employer and welcomes applications from all qualified candidates.