As the global transition to electrification accelerates, electric vehicle cable assemblies have emerged as a critical enabling technology for EV manufacturers worldwide. Nexharn Connectivity engineers and manufactures precision electric vehicle cable assemblies that meet the demanding electrical, thermal, and mechanical requirements of modern battery electric vehicles (BEVs), plug-in hybrid electric vehicles (PHEVs), and commercial electric platforms.
Electric Vehicle Cable Assemblies: Core EV Power Infrastructure
Modern electric vehicles depend on sophisticated electric vehicle cable assemblies to transmit high-voltage power between the battery pack, power distribution unit, inverter, electric motor, and charging system. These assemblies operate at system voltages from 400V to 800V DC and must maintain thermal stability, mechanical durability, and electromagnetic compatibility (EMC) throughout 15+ year vehicle lifecycles under harsh road conditions.
Nexharn’s engineering team designs automotive cable assemblies conforming to ISO 6722, USCAR-21, SAE J1128, and LV 216 international wiring harness standards. Every assembly undergoes comprehensive testing including high-potential (hi-pot) dielectric withstand, insulation resistance measurement, thermal cycling, and vibration endurance before shipment.
EV High-Voltage Wiring Harness Solutions
The EV high-voltage wiring harness is the central power distribution backbone of any electric vehicle. Unlike conventional 12V automotive wiring, HV harnesses manage power levels exceeding 200kW while providing absolute protection for occupants and service technicians. Our EV high-voltage wiring harness product range includes:
- Main Battery Pack Harness – Interconnects battery modules within the pack, rated for continuous current to 500A with conductors from 16mm² to 120mm² cross-section
- Inverter-to-Motor Power Cable – Three-phase shielded assemblies with copper or aluminum conductors, engineered for continuous duty at elevated temperatures up to 125°C
- DC Fast Charge Cables – CCS Combo 2 and CHAdeMO compatible assemblies rated for up to 350kW charging throughput
- AC Onboard Charger Harness – Single-phase and three-phase configurations for Level 1 and Level 2 charging infrastructure
- Battery Management System (BMS) Wiring – Low-voltage signal harnesses enabling cell voltage sensing, temperature monitoring, and active balancing
Battery Interconnect Systems
Battery interconnect assemblies link individual cells and modules within lithium-ion and solid-state battery packs, playing a decisive role in pack energy density, charge/discharge performance, and long-term safety. Nexharn develops battery interconnect solutions in direct collaboration with cell manufacturers and pack integrators:
- Busbar Assemblies – Precision laser-cut copper and aluminum busbars with tin or nickel plating, engineered for minimal resistance and maximum current-carrying capacity
- Flexible Circuit Interconnects – FFC and FPC-based cell interconnect boards (CIBs) optimized for pouch and prismatic cell pack architectures
- Ultrasonic Welded Tab Connections – High-reliability cell tab joining for cylindrical (18650, 21700, 4680), prismatic, and pouch cell formats
- Module-to-Module Connectors – High-current connector platforms from TE Connectivity, Amphenol, and Molex, fully qualified for EV thermal and vibration environments
Automotive Interconnects for EV Architectures
Beyond the primary high-voltage power path, modern electric vehicles demand extensive automotive interconnects for vehicle control, active safety, driver assistance, and comfort systems. Our automotive interconnects portfolio for EV platforms includes:
- HVIL (High Voltage Interlock Loop) Circuits – Safety interlock wiring enabling sub-millisecond HV power shutdown upon connector separation or housing intrusion
- Thermal Management Harnesses – Wiring assemblies for liquid cooling loops, PTC cabin heaters, and refrigerant-cooled battery thermal management systems
- CAN Bus, LIN Bus, and FlexRay Networks – Vehicle communication backbone wiring linking ECU, BMS, VCU, OBC, and EVCC control modules
- ADAS Sensor Harnesses – High-speed LVDS, FAKRA, and HSD assemblies for LIDAR, radar, and camera systems enabling Level 2+ autonomous driving features
- Automotive Ethernet Backbone – 100BASE-T1 and 1000BASE-T1 wiring supporting next-generation zone E/E architectures
Material Selection for EV Cable Assemblies
Extreme operating conditions inside EV battery packs and powertrain compartments demand careful material engineering. Nexharn specifies and sources materials rated for the full EV operating environment:
- Conductors – Bare copper, tinned copper, or aluminum selected by current density, weight targets, and galvanic corrosion requirements
- Insulation – XLPE, XLPO, and halogen-free TPE insulation systems rated -40°C to +125°C continuous with +150°C short-duration rating
- Shielding – Copper braid or aluminum foil-braid combinations for CISPR 25 Class 5 and UNECE Regulation 10 EMC compliance
- Jacketing – UV-resistant, oil-resistant, flame-retardant outer jackets conforming to UL 758 and SAE J1128
- Connectors – IP67 and IP69K-rated high-voltage connectors from Aptiv, TE Connectivity, Rosenberger, and Amphenol
Quality and Testing
Every Nexharn electric vehicle cable assembly is manufactured under IATF 16949-certified quality management. Our testing protocols align with automotive OEM supplier requirements:
- Hi-Pot dielectric withstand testing at 4kV DC per USCAR-21 (100% of assemblies)
- Insulation resistance not less than 100MΩ at 500V DC
- Full continuity and resistance verification on every assembly
- Thermal shock -40°C to +125°C cycling (1000 cycles per IEC 60068-2-14)
- Salt spray corrosion exposure per ISO 9227
- Vibration endurance per ISO 16750-3 automotive road profile
- Pull-out force and contact retention on all crimp terminations
EV Applications
Nexharn’s electric vehicle cable assemblies and EV high-voltage wiring harnesses serve a broad spectrum of electrified platforms:
- Passenger BEV and PHEV platforms – Tier 1 and OEM direct supply
- Class 6-8 commercial electric trucks and transit buses
- Electric delivery vehicles and urban logistics fleets
- Electric two-wheelers, scooters, and micro-mobility platforms
- Industrial EVs: electric forklifts, AGVs, and autonomous mobile robots (AMRs)
- Marine and off-highway electric powertrain applications
- EV charging infrastructure (EVSE station cable assemblies)
Why Nexharn for Electric Vehicle Cable Assemblies
Nexharn Connectivity has built extensive capabilities in electric vehicle cable assemblies through sustained partnerships with Tier 1 automotive suppliers and EV OEMs globally. Our key differentiators include:
- Application Engineering – Our engineers collaborate with your team from concept through production validation, optimizing cable routing, connector selection, and mechanical packaging
- Rapid Prototyping – Engineering samples typically delivered in 2-3 weeks for design validation and qualification builds
- Scalable Manufacturing – Flexible capacity from development quantities to full series production volume
- Full Traceability – Material lot traceability, conflict minerals compliance (EICC/GeSI), and IMDS material data reporting
- Responsive Logistics – Stocked strategic raw materials and streamlined scheduling for competitive lead times
To discuss your electric vehicle cable assembly requirements or request a quotation for automotive cable assemblies, please contact our engineering team. We partner with EV manufacturers at every stage of the development cycle to deliver wiring solutions that meet your performance, weight, and cost targets.