Job Title: Senior Engineer – BESS Battery Pack Electrical DesignLocation: BangaloreJob Type: Full-timeExperience: 4+ years About the RoleWe are looking for a Senior Engineer with strong hands-on experience in electrical design of Lithium-ion battery packs, preferably for BESS / Energy Storage applications.The role will primarily focus on battery pack electrical architecture and design, including cell configuration, pack sizing, HV electrical systems, busbars, contactors, fuses, pre-charge circuits, BMS integration, and electrical protection.The role will also involve supporting battery pack testing and validation to ensure the design meets performance, safety, and reliability requirements. Key requirement: Candidates must have hands-on experience in electrical design of battery packs. Candidates whose experience is primarily mechanical pack design, enclosure/CAD design, thermal design, BMS testing, or battery testing will not be preferred. Key ResponsibilitiesElectrical Battery Pack Design – 70%<ul><li>Design and develop electrical architecture of Lithium-ion battery packs for BESS applications.</li><li>Develop cell configuration, series/parallel architecture, pack voltage, capacity and power calculations.</li><li>Design and size busbars and electrical interconnections based on current, voltage and thermal requirements.</li><li>Design/integrate HV systems, contactors, fuses, pre-charge circuits, HVIL, connectors and protection circuits.</li><li>Integrate BMS, CAN communication, cell monitoring, balancing and protection logic.</li><li>Select appropriate LFP/NMC cells and electrical components based on application requirements.</li><li>Prepare electrical schematics, wiring diagrams, BOMs and design specifications.</li><li>Work with suppliers on cells, BMS, contactors, fuses, connectors and other electrical components.</li><li>Participate in DFMEA and electrical safety/design reviews.</li><li>Work closely with mechanical and thermal teams to ensure complete pack-level integration.</li></ul>Battery Testing – 15%<ul><li>Support and/or execute battery pack electrical and performance testing.</li><li>Perform/support charge-discharge, capacity, cycle-life and electrical safety testing.</li><li>Support thermal and IP testing as required.</li><li>Troubleshoot electrical issues identified during testing and implement design improvements.</li></ul>Validation &amp; Compliance – 15%<ul><li>Support battery pack validation plans, test protocols and acceptance criteria.</li><li>Analyze test results and support validation of pack performance and safety.</li><li>Support thermal runaway testing and safety validation.</li><li>Coordinate with external laboratories for applicable certifications such as UN38.3, IEC 62619, UL 9540A, etc.</li><li>Prepare validation and technical reports.</li></ul>Required Qualifications<ul><li>B.E./B.Tech or M.E./M.Tech in Electrical, Electronics, EEE, ECE, Mechatronics, or related engineering disciplines.</li><li>4+ years of hands-on experience in electrical design of Lithium-ion battery packs.</li><li>Strong experience in battery pack electrical architecture and design.</li><li>Hands-on experience with BMS integration and CAN communication.</li><li>Strong knowledge of HV systems, busbars, contactors, fuses, pre-charge and electrical protection.</li><li>Experience with LFP/NMC battery systems.</li><li>Understanding of SOC/SOH, cell behaviour and battery safety.</li></ul>Preferred Experience<ul><li>Experience in BESS / Energy Storage / EV battery systems.</li><li>Experience with high-voltage battery packs (400V–1000V+).</li><li>Exposure to thermal runaway mitigation and battery safety.</li><li>Experience with DFMEA and battery certification.</li><li>Experience working with cell/BMS/electrical component suppliers.</li></ul>