Principal Battery Systems Engineer

HappyGlobal Service; Irvine (CA); On-site; USD 150,000 - 180,000; Full time

Job summary

HappyGlobal Service seeks an experienced systems engineer to lead HV battery development and ensure seamless integration across cells, pack, BMS, and vehicle interfaces. You will translate requirements, define targets, and drive cross-functional studies to deliver robust battery systems for electrified vehicles.

The role requires multi-disciplinary collaboration, DFMEA leadership, and mentoring across programs, with a focus on delivering safe, high-performance battery solutions for a leading EV

Qualifications

• BS, MS, or PhD in Systems, Electrical, Mechanical, Automotive, Chemical Engineering, or a related discipline.
• 7+ years of experience in EV batteries, high-voltage battery systems, electrified powertrains, or related automotive systems.
• Strong understanding of HV battery architecture, including cells, pack mechanical systems, HV/LV electrical systems, thermal management, charging, BMS interfaces, and vehicle integration.
• Demonstrated experience translating vehicle or OEM requirements into battery-system requirements and technical targets.
• Strong understanding of battery performance and the interaction between cell capability, voltage, current, SOC, temperature, aging, thermal performance, and vehicle demand.
• Proven ability to integrate multiple engineering disciplines and make sound system-level technical decisions.
• Experience with requirements, architecture, validation, vehicle integration, or technical issue resolution for complex automotive systems.
• Strong technical problem-solving, data-analysis, and root-cause capability.
• Strong communication skills and ability to work directly with OEM engineering organizations.

Responsibilities

• Serve as the system-level technical lead for high-voltage battery development and integration.
• Translate vehicle and customer requirements into battery-system and subsystem requirements across cell, mechanical, electrical, thermal, BMS interfaces, validation, and manufacturing.
• Own requirement decomposition, allocation, traceability, verification, and system-level change impact.
• Define and integrate battery performance targets, including energy, power, voltage, current, charging, temperature, aging, and safety limits.
• Lead cross-functional architecture and technical trade studies across performance, safety, durability, packaging, cost, and manufacturability.
• Integrate inputs from Cell, Mechanical, Electrical, Thermal, CAE, Validation, Manufacturing, and customer engineering teams into a consistent system solution that meets customer requirements.
• Lead the technical interface with BMS and controls teams for battery operating limits, capability maps, sensing, diagnostics, protection thresholds, and other constraints.
• Lead system DFMEA, technical risk reviews, and system-level design reviews.
• Define system verification methods and support DVP&R and validation planning.
• Analyze cell, pack, BMS, simulation, test, and vehicle data to identify system limitations and root causes.
• Lead cross-functional technical issue resolution and drive corrective actions to closure.
• Ensure consistency between customer specifications, Gotion requirements, design releases, validation plans, and production-intent configurations.
• Support vehicle launch, production ramp-up, and field issue resolution.
• Help establish battery systems engineering practices and mentor engineers across programs.

Skills

Systems engineering

EV battery systems

HV battery architecture

Requirements management

DFMEA

Cross-functional leadership

BMS interfaces

Battery validation

Data analysis

Vehicle integration

Education

BS/MS/PhD in Systems/Engineering/Automotive

Tools

DOORS

Jama

Polarion

Job description

Our client innovates in the next generation electric vehicle and energy storage technologies (lithium batteries and related systems) with the aim to accelerate electrified transportation and achieve sustainable development. The company is powered by a leading power battery technology company that provides solutions for vehicles including the world's first mass commercial e-bus route.

Key Responsibilities

• Serve as the system-level technical lead for high-voltage battery development and integration.
• Translate vehicle and customer requirements into battery-system and subsystem requirements across cell, mechanical, electrical, thermal, BMS interfaces, validation, and manufacturing.
• Own requirement decomposition, allocation, traceability, verification, and system-level change impact.
• Define and integrate battery performance targets, including energy, power, voltage, current, charging, temperature, aging, and safety limits.
• Lead cross-functional architecture and technical trade studies across performance, safety, durability, packaging, cost, and manufacturability.
• Integrate inputs from Cell, Mechanical, Electrical, Thermal, CAE, Validation, Manufacturing, and customer engineering teams into a consistent system solution that meets customer requirements.
• Lead the technical interface with BMS and controls teams for battery operating limits, capability maps, sensing, diagnostics, protection thresholds, and other constraints.
• Lead system DFMEA, technical risk reviews, and system-level design reviews.
• Define system verification methods and support DVP&R and validation planning.
• Analyze cell, pack, BMS, simulation, test, and vehicle data to identify system limitations and root causes.
• Lead cross-functional technical issue resolution and drive corrective actions to closure.
• Ensure consistency between customer specifications, Gotion requirements, design releases, validation plans, and production-intent configurations.
• Support vehicle launch, production ramp-up, and field issue resolution.
• Help establish battery systems engineering practices and mentor engineers across programs.

Qualifications

• BS, MS, or PhD in Systems, Electrical, Mechanical, Automotive, Chemical Engineering, or a related discipline.
• 7+ years of experience in EV batteries, high-voltage battery systems, electrified powertrains, or related automotive systems.
• Strong understanding of HV battery architecture, including cells, pack mechanical systems, HV/LV electrical systems, thermal management, charging, BMS interfaces, and vehicle integration.
• Demonstrated experience translating vehicle or OEM requirements into battery-system requirements and technical targets.
• Strong understanding of battery performance and the interaction between cell capability, voltage, current, SOC, temperature, aging, thermal performance, and vehicle demand.
• Proven ability to integrate multiple engineering disciplines and make sound system-level technical decisions.
• Experience with requirements, architecture, validation, vehicle integration, or technical issue resolution for complex automotive systems.
• Strong technical problem-solving, data-analysis, and root-cause capability.
• Strong communication skills and ability to work directly with OEM engineering organizations.

Preferred / Nice To Have

• Experience with major EV or automotive OEM battery programs.
• Experience at an OEM, battery manufacturer, automotive Tier 1, or EV technology company.
• Experience with BMS hardware and software interfaces.
• Familiarity with battery capability maps, power limits, charging limits, DVP&R, DFMEA, ISO 26262, and requirements-management tools such as DOORS, Jama, or Polarion.

HappyGlobal Service and its clients are committed to providing equal employment opportunities to all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law. All qualified applicants are encouraged to apply.