Battery Intelligence Engineer: Cell Data & SoC/SoH Expert

Rimac Group; Witney; Hybrid; GBP 60,000 - 90,000; Full time

Benefits offered by this job

26 days annual leave

8 public holidays

Private medical insurance for you and

Company pension scheme with auto-enrol

Job summary

Rimac Energy, the energy storage division of Rimac Group, is seeking a Battery Intelligence Engineer to own how we understand our cells, from selecting and testing them to analysing performance and ageing in the field. You’ll be hands-on with cell testing, data acquisition, and validating SoC/SoH algorithms on real systems.

You will engage with suppliers, design test rigs, and develop plans to ensure robust testing across electrical, thermal, ageing, and safety aspects.

Qualifications

• 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.

Responsibilities

• Engage with cell suppliers on their latest offerings and future cell roadmaps, shortlisting candidate cells for testing.
• Plan and run cell testing, covering all 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 project needs.
• Analysis of cell test data and generation of test reports to highlight performance characteristics.
• Tracking selected cells through module and rack build, reviewing build and test data at each stage to ensure consistent performance.
• Follow the cell’s operation in the field, using fleet data to spot trends in performance, safety and ageing.
• Create test plans to validate our algorithms and models across embedded, edge, and cloud.
• Design test rigs to validate our cells and modules in realistic conditions.
• Lead data generation and analysis, comparing results against model outputs and flagging divergences.
• Support degradation assessments and lifetime optimisation.
• Act as a technical expert on current and future lithium-ion battery technology.
• Consult with stakeholders on the impact of the BESS design on cell performance.

Skills

Battery testing

Data analysis

Python/MATLAB

Test rig design

Stakeholder communication

Education

Engineering or STEM degree (Bachelor’s or Master’s)

Job description

Rimac Energy, the energy storage division of Rimac Group, is seeking a Battery Intelligence Engineer to own how we understand our cells, from selecting and testing them to analysing performance and ageing in the field. You’ll be hands-on with cell testing, data acquisition, and validating SoC/SoH algorithms on real systems.

You will engage with suppliers, design test rigs, and develop plans to ensure robust testing across electrical, thermal, ageing, and safety aspects.