Assembly Process Engineer - 3C Battery
Factorial EnergyCheonan, South Korea
Full Time
Posted June 16, 2026
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Job Description
Cheonan, South Korea
Key Responsibilities
- Factorial Energy is seeking an Assembly Process Engineer to join our team in our Cheonan, South Korea location. This person will be responsible for the development, optimization, and scale-up of pouch cell assembly processes for our Silicon Power Cell line, covering the full assembly chain from post-stacking through final sealing. The ideal candidate brings deep hands-on expertise in pouch stacking cell assembly, is comfortable driving yield improvement and process standardization, and thrives in an early-stage, fast-moving manufacturing environment.
- Lead development and optimization of pouch stacking cell assembly processes covering electrode alignment, stacking compaction, tab forming, pre-sealing, and final sealing
- Define and maintain process windows for all key assembly parameters, establishing CTQs and process standards
- Establish and maintain SOPs, PFMEA, and Control Plans for all assembly process steps
- Adapt assembly structures and processes to accommodate silicon anode volume expansion characteristics, minimizing stacking flatness deviation and sealing reliability risks
- Collaborate with R&D and electrode teams to evaluate silicon anode impact on stacking flatness, electrode slippage, and sealing integrity
- Develop and validate process parameters to mitigate assembly and reliability risks caused by Si anode volume changes during cycling
- Lead assembly process transfer from lab/pilot scale through EVT/DVT/PVT/MP stages
- Identify yield and cycle time bottlenecks and develop ramp-up plans targeting 2–5% yield improvement
- Support FAT/SAT and equipment qualification (IQ/OQ/PQ) for assembly equipment
- Partner with equipment vendors on assembly fixture, tooling, and automation solution design and validation
- Apply DOE, SPC, 5-Why, and fishbone analysis to identify root causes of assembly defects (tab misalignment, sealing defects, stacking wrinkles)
- Drive cross-functional (R&D/Quality/Equipment) issue resolution and CAPA closure
- Document assembly process experience to build replicable technical solutions
Requirements
- Have 3+ years of hands-on experience in lithium-ion pouch cell assembly process development or manufacturing
- Have at least 2 years of experience in pouch stacking cell assembly processes
- Have led or substantially contributed to at least one full NPI or mass production ramp-up project
- Have deep understanding of pouch stacking cell structures and key assembly control points
- Have experience with silicon anode pouch cell assembly or high-expansion electrode systems preferred
- Are familiar with process qualification frameworks (DFMEA → PFMEA → CP → SOP)
- Have basic mechanical assembly knowledge; ability to interpret mechanical drawings and understand assembly tolerances
- Are proficient in DOE, SPC, and data analysis tools
- Have experience with defect analysis methodologies (5-Why, fishbone, 8D)
- Hold a Bachelor's degree or higher in Mechanical Engineering, Materials Science, Chemical Engineering, or related field
- Have experience in pilot line or new production line setup from 0 to 1 (preferred)
- Are familiar with IATF 16949 and APQP systems (preferred)
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