Battery Cell Test Engineer II

Rivian

Tustin, CA Full-time 3/31/2026

Master's Entry-Level

Approval 99%•Total filings 685•New hires 98•

✓ Established Sponsor

•FY 2025

Job Description

This position involves executing tests on lithium-ion battery cells, including electrical, mechanical, and electrochemical assessments. The role requires collaboration with engineers and scientists to automate testing processes and analyze results, contributing to the development of battery technologies for electric vehicles.

Requirements

MS degree in an engineering discipline with experience in testing of lithium-ion battery cells/packs.
Good understanding of cell performance metrics and how to evaluate them with testing and other analysis.
Good understanding of electrochemical processes in various lithium-ion chemistries.
Experience in python and SQL database, capable to write scripts.
Excellent attention to detail and critical thinking.
Problem solving skills, outside of the box thinking and proactivity.
Desire to work in fast-paced environment and willing to make an extra effort to get the job done.
Passionate about research/work in lithium-ion batteries, especially for EV application.
Excellent communication and presentation skills.

Responsibilities

Execute lithium-ion battery cell tests including electrical, mechanical, and electrochemical testing.
Define SOP, prioritize tests, track and communicate test status to different groups of cell engineers and scientists.
Write test scripts and set up program to run tests automatically with different cyclers and chambers.
Collaborate with data engineers to process data, maintain cell testing database and develop automated data post-processing and report generation scripts.
Analyze and present test results to cell engineers and scientists and support cross functional teams with test report if needed.
Contribute to automating the entire testing process from test requests to delivery of test results report.
Work closely with test engineers and technicians to plan and execute long/medium/short-term priorities.
Develop and implement lab KPIs, using scripts, to analyze lab operation and improve productivity.
Design test fixture to improve testing capability and accuracy and extract representative and meaningful data.
Collaborate with equipment vendors to source and integrate external systems to Rivian cell testing lab.
Maintain lab space and equipment, perform equipment calibration and troubleshooting as needed.

Benefits

Employees at Rivian are often offered comprehensive health, dental, and vision insurance, a 401(k) with company match, ESPP and potential RSU grants, performance bonuses, and generous time off including paid parental and sick leave. Perks can include 24/7 mental-health coaching and therapy, Hinge Health for Anthem enrollees, tuition assistance and professional development, plus on-site food and a wide range of employee discounts on items like computers, mobile phones, home loans, and pet care.

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