{"schemaVersion":"jobsearcher.job.v1","id":"0ee2bf05f725253bc2c3e1fa","url":"https://jobsearcher.com/jobs/0ee2bf05f725253bc2c3e1fa","canonicalUrl":"https://jobsearcher.com/jobs/0ee2bf05f725253bc2c3e1fa","title":"Battery Pack Systems","description":"Battery / Pack Systems Engineer – Integrated Rack Power PlatformLocation: San Jose, CA (On-site)Reports To: Head of Engineering, Data Center Power PlatformAbout the RoleWe are building an integrated PSU + BBU rack power shelf that combines power conversion and solid-state battery backup into a single high-density platform for hyperscale AI data centers.This product replaces traditional separate PSU and BBU shelves with a unified architecture that leverages the unique safety and performance characteristics of solid-state battery cells.As the Battery / Pack Systems Engineer, you will own everything from cell to pack—including mechanical integration, Battery Management System (BMS) architecture, thermal management of the battery section, charge/discharge optimization, safety engineering, and cycle life validation. You will serve as the critical bridge between our cell technology and the power platform, translating evolving cell-level specifications into robust pack-level designs in near real-time.What You'll DoDesign the complete cell-to-pack mechanical assembly, including:Cell stackingCompression systemsElectrical interconnects (wire bonding, busbar welding, or flex circuits)Structural integration within the shared PSU + BBU enclosureArchitect the Battery Management System (BMS) hardware topology, including:Distributed versus centralized sensingPassive versus active balancingProtection FET sizingSense line routingCommunication interfacesDevelop and tune State-of-Charge (SOC) and State-of-Health (SOH) estimation algorithms using:Coulomb countingExtended Kalman filteringImpedance-based estimation methodsSolid-state battery electrochemistry modelsCo-develop charge and discharge profiles with Firmware Engineering, including:CC-CV charging curvesTemperature-dependent charge rate limitsFast-charge protocolsFloat and maintenance charging strategies optimized for data center duty cyclesDesign thermal interfaces between battery cells and the enclosure using:Thermal padsGap fillersHeat spreadersDedicated thermal pathwaysCollaborate closely with the Thermal / Mechanical Engineering team.Conduct pack-level FMEA and battery safety analysis.Define and execute abuse testing protocols including:Nail penetrationCrush testingOvercharge testingExternal short-circuit testingValidation adapted specifically for solid-state battery behaviorDevelop accelerated aging and life-cycle validation protocols for data center applications, including prolonged high-State-of-Charge float conditions with infrequent high-power discharge events.Serve as the primary liaison with the cell development team, translating pack-level requirements into cell-level specifications and feeding laboratory and field performance data back into future cell development.Support safety certification efforts including:UL 1973UL 9540AWhat You BringRequired Qualifications8+ years of experience designing battery packs or battery modules, with at least one product successfully validated through prototype testing or production.Hands-on Battery Management System (BMS) architecture experience. (PCB layout experience is not required, but the ability to define system topology and component selection is essential.)Strong battery characterization and modeling experience, including:Impedance spectroscopyCapacity fade analysisThermal characterizationExperience with battery safety standards, particularly:UL 1973Exposure to UL 9540A strongly preferredProficiency in pack-level mechanical and thermal design using:SolidWorksCreoEquivalent CAD platformsThermal simulation experience is a plus.Comfortable making engineering decisions while working with evolving battery cell specifications and incomplete technical data.Preferred QualificationsExperience with solid-state, lithium-metal, or other next-generation battery chemistries, including research environments.Experience designing battery systems for:Data centersTelecom backup powerStationary energy storageUnderstanding of float-then-discharge duty cycles compared to electric vehicle cycling.Familiarity with electrochemical modeling tools such as:COMSOLPyBaMMAutoLionEquivalent platformsExperience with IEC 62619 industrial battery safety standards.Applications engineering experience at a battery cell manufacturer, translating cell performance into production pack designs.Knowledge of functional safety principles including:IEC 61508Equivalent standardsWhy This Role MattersYou sit at the center of the engineering organization. The Power Electronics Lead depends on your voltage windows, current limits, and battery performance requirements. The Firmware Engineer relies on your Battery Management System algorithms and protection strategies. The Thermal / Mechanical Engineer depends on your cell thermal requirements and packaging constraints. The Cell Development Team relies on your pack-level feedback to continuously improve cell performance.Most importantly, the safety, reliability, and long-term longevity of solid-state batteries deployed in hyperscale AI data center racks will ultimately be defined by your engineering decisions. This role is central to delivering the core technology differentiator of the entire platform.","company":"Quantumscape","rawCompany":"quantumscape","city":"San Jose","state":"CA","isRemote":false,"isActive":true,"createdAt":"2026-07-29T10:58:33.114Z","occupations":[{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"17-2199.00","title":"Engineers, All Other","slug":"engineers-all-other"},{"code":"17-2071.00","title":"Electrical Engineers","slug":"electrical-engineers"}],"industries":[{"code":"335910","title":"Battery Manufacturing","slug":"battery-manufacturing"},{"code":"335999","title":"All Other Miscellaneous Electrical Equipment and Component Manufacturing","slug":"all-other-miscellaneous-electrical-equipment-and-component-manufacturing"},{"code":"541330","title":"Engineering Services","slug":"engineering-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Battery Pack Systems","description":"Battery / Pack Systems Engineer – Integrated Rack Power PlatformLocation: San Jose, CA (On-site)Reports To: Head of Engineering, Data Center Power PlatformAbout the RoleWe are building an integrated PSU + BBU rack power shelf that combines power conversion and solid-state battery backup into a single high-density platform for hyperscale AI data centers.This product replaces traditional separate PSU and BBU shelves with a unified architecture that leverages the unique safety and performance characteristics of solid-state battery cells.As the Battery / Pack Systems Engineer, you will own everything from cell to pack—including mechanical integration, Battery Management System (BMS) architecture, thermal management of the battery section, charge/discharge optimization, safety engineering, and cycle life validation. You will serve as the critical bridge between our cell technology and the power platform, translating evolving cell-level specifications into robust pack-level designs in near real-time.What You'll DoDesign the complete cell-to-pack mechanical assembly, including:Cell stackingCompression systemsElectrical interconnects (wire bonding, busbar welding, or flex circuits)Structural integration within the shared PSU + BBU enclosureArchitect the Battery Management System (BMS) hardware topology, including:Distributed versus centralized sensingPassive versus active balancingProtection FET sizingSense line routingCommunication interfacesDevelop and tune State-of-Charge (SOC) and State-of-Health (SOH) estimation algorithms using:Coulomb countingExtended Kalman filteringImpedance-based estimation methodsSolid-state battery electrochemistry modelsCo-develop charge and discharge profiles with Firmware Engineering, including:CC-CV charging curvesTemperature-dependent charge rate limitsFast-charge protocolsFloat and maintenance charging strategies optimized for data center duty cyclesDesign thermal interfaces between battery cells and the enclosure using:Thermal padsGap fillersHeat spreadersDedicated thermal pathwaysCollaborate closely with the Thermal / Mechanical Engineering team.Conduct pack-level FMEA and battery safety analysis.Define and execute abuse testing protocols including:Nail penetrationCrush testingOvercharge testingExternal short-circuit testingValidation adapted specifically for solid-state battery behaviorDevelop accelerated aging and life-cycle validation protocols for data center applications, including prolonged high-State-of-Charge float conditions with infrequent high-power discharge events.Serve as the primary liaison with the cell development team, translating pack-level requirements into cell-level specifications and feeding laboratory and field performance data back into future cell development.Support safety certification efforts including:UL 1973UL 9540AWhat You BringRequired Qualifications8+ years of experience designing battery packs or battery modules, with at least one product successfully validated through prototype testing or production.Hands-on Battery Management System (BMS) architecture experience. (PCB layout experience is not required, but the ability to define system topology and component selection is essential.)Strong battery characterization and modeling experience, including:Impedance spectroscopyCapacity fade analysisThermal characterizationExperience with battery safety standards, particularly:UL 1973Exposure to UL 9540A strongly preferredProficiency in pack-level mechanical and thermal design using:SolidWorksCreoEquivalent CAD platformsThermal simulation experience is a plus.Comfortable making engineering decisions while working with evolving battery cell specifications and incomplete technical data.Preferred QualificationsExperience with solid-state, lithium-metal, or other next-generation battery chemistries, including research environments.Experience designing battery systems for:Data centersTelecom backup powerStationary energy storageUnderstanding of float-then-discharge duty cycles compared to electric vehicle cycling.Familiarity with electrochemical modeling tools such as:COMSOLPyBaMMAutoLionEquivalent platformsExperience with IEC 62619 industrial battery safety standards.Applications engineering experience at a battery cell manufacturer, translating cell performance into production pack designs.Knowledge of functional safety principles including:IEC 61508Equivalent standardsWhy This Role MattersYou sit at the center of the engineering organization. The Power Electronics Lead depends on your voltage windows, current limits, and battery performance requirements. The Firmware Engineer relies on your Battery Management System algorithms and protection strategies. The Thermal / Mechanical Engineer depends on your cell thermal requirements and packaging constraints. The Cell Development Team relies on your pack-level feedback to continuously improve cell performance.Most importantly, the safety, reliability, and long-term longevity of solid-state batteries deployed in hyperscale AI data center racks will ultimately be defined by your engineering decisions. This role is central to delivering the core technology differentiator of the entire platform.","datePosted":"2026-07-29T10:58:33.114Z","dateModified":"2026-07-29T10:58:33.114Z","hiringOrganization":{"@type":"Organization","name":"Quantumscape","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"San Jose","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"0ee2bf05f725253bc2c3e1fa"},"url":"https://jobsearcher.com/jobs/0ee2bf05f725253bc2c3e1fa"}}