Battery Cell Engineer

Fluence Energy•Houston, TX

About The Position

The Battery Cell Engineer is responsible for driving end-to-end battery development by integrating electrochemical, process, and mechanical engineering concepts into robust, scalable solutions. This role combines deep technical leadership with business technology planning to ensure successful implementation of new battery technologies across product development and manufacturing. The position leads the evaluation, introduction, and qualification of new materials, tooling, and fixtures, while ensuring readiness for production through the preparation and maintenance of Standard Operating Procedures (SOPs) and Bills of Materials (BOMs) for both sample builds and assembly operations. The role also oversees product operational testing, including charge and discharge performance, cycle life validation, and failure analysis, translating data into actionable engineering improvements. In addition, the role is accountable for the design and optimization of battery thermal management solutions, performing simulations, theoretical calculations, and physical testing to validate performance. Through efficiency modeling and service life prediction, the role ensures products meet performance, reliability, and lifetime targets while supporting continuous improvement and innovation in battery technology.

Requirements

Bachelor’s degree or higher in Electrochemistry, Chemical Engineering, Materials Science, or a related field
3+ years of experience in battery cell development, testing, qualification, or validation
Demonstrated hands-on experience evaluating lithium-based battery cells, with a strong understanding of battery chemistry, performance, and degradation mechanisms
Proven ability to translate battery system‑level requirements into cell‑level specifications
Experience working with battery test systems, test methodologies, and performance evaluation (e.g., charge/discharge, cycle life, reliability testing)
Strong capability to collaborate across multiple disciplines, departments, and global teams, both internally and externally
Excellent organizational, analytical, and problem‑solving skills
Strong technical documentation and report‑writing capabilities
Excellent written and verbal communication skills in English
Self‑driven, proactive, and able to manage multiple priorities in a dynamic environment
Willingness and ability to travel domestically and internationally up to 15–25% of the time

Nice To Haves

Familiarity with battery modeling and mathematical analysis of battery designs

Responsibilities

Li-ion battery cell design specification and evaluation of cell and related battery system components from multiple manufacturers.
Focusing on specification and deep evaluation of third-party battery system components and DC systems and their incorporation into Fluence stationary energy storage systems.
Design and propose new research and testing of cell designs and evaluate outcomes of testing.
Guide Fluence cell technology selection and act as a subject matter expert for all strategies related to cell technologies.
Track cell roadmaps of cell vendors and incorporate into Fluence system planning
Design and qualification of new cell technology platforms by working across cell suppliers to adapt their technologies
Drive new technology development with cell suppliers
Define key parameters, procedures, and evaluation strategies for battery performance
Work with 3rd party labs to evaluate new cell technologies and support development work
Simulate cell performance in different aging stages by working with 3rd party lab & supplier
Supplier management & communication to let them fully understand FLN battery cell development process & requirements and release corresponding deliverables on time
Work with supplier to root cause test failures and production problems
Collaboration with different function teams inside company to deliver the product on time
Support ongoing/continuous product and process improvement
Optimize designs via analytical, numerical, and/or empirical assessments