Six sub-domains defining the EV HV wiring landscape

EV high voltage wiring systems encompass all electrical interconnection hardware and architecture operating above 60V DC or 25V AC within a vehicle — primarily the 300V to 1000V domain. Across 30+ patent records and technical literature spanning 2006 to 2026, six core sub-domains are identifiable: HV bus and power distribution architecture, high-frequency AC (HFAC) distribution systems, HV cable design and thermal management, high voltage interlock loop (HVIL) safety systems, HV–LV interface and DC-DC conversion, and EV-to-EVSE communication protocols.

The six sub-domains do not evolve in isolation. HV bus architecture choices directly dictate cable routing requirements; HVIL design complexity scales with connector count; and EVSE communication standards govern the charging interface layer. Understanding how innovation across each sub-domain is distributed — by assignee, jurisdiction, and filing date — reveals where the most active patent positions are being established and where white space remains.

Of the six sub-domains, HV bus architecture and cable thermal management are attracting the highest volume of filings in the 2023–2026 window, driven by the convergence of 800V platform adoption and ultra-fast charging requirements. According to WIPO data on electromobility patent trends, EV powertrain and charging system patents have grown consistently across major filing jurisdictions over the past decade.

Three phases of innovation: from aerospace roots to 800V intelligence

Patent filing dates in this dataset span from 2006 to 2026 and reveal three distinct phases of maturity, each driven by a different set of technical and market pressures.

Phase 1 — Foundational (2006–2012): Early filings from Honeywell International established redundant multi-bus HV AC and DC distribution architectures, initially targeting aerospace-grade “more electric vehicle” platforms. Key patents filed in 2006 across US, EP, and WO jurisdictions defined the dual-bus AC/DC architecture that later influenced automotive HV distribution. Hyundai Motor Company’s 2010 US priority filing addressed the elimination of sub-batteries by leveraging HV battery cells to supply low-voltage loads — a foundational concept in modern integrated HV systems.

Phase 2 — Expansion and Differentiation (2016–2022): South China University of Technology (SCUT) filed a sequence of patents from 2016 to 2023 across CN, US, and SG jurisdictions, articulating the HFAC distributed architecture that divides vehicle loads into four spatial zones powered by parallel high-frequency inverters. Chery New Energy Automobile filed its first CN high-voltage architecture patent in 2019, addressing four-wheel-drive to two-wheel-drive dynamic switching on a unified HV platform. Manufacturing literature published in 2022 documented that HV wire harness production remains up to 85% manual — signalling an automation gap that represents a near-term R&D target.

“HV wire harness production remains up to 85% manual — signalling an automation gap that represents a near-term R&D target.”

Phase 3 — Integration and Intelligence (2023–2026): The most recent filings show convergence toward integrated HV control modules, V2V fast-charging HV architectures (General Motors, CN, 2025), HVIL wire elimination via software-defined diagnostics (International Truck Intellectual Property Company, US, 2025–2026), thermally managed cables with embedded heat pipes (Hydro Extruded Solutions, WO, 2025), and distributed dynamic HV architectures for aerial electric vehicles (Supernal LLC, WO, 2026).

Four patent clusters driving competitive differentiation

The 30+ records in this dataset group into four distinct technology clusters, each with a different competitive structure, maturity level, and strategic risk profile.

Cluster 1: Distributed HFAC power distribution

This approach replaces the conventional DC harness backbone with a high-frequency AC bus operating at kHz frequencies, fed by zone-level inverters. Each spatial zone of the vehicle — left-front, right-front, left-rear, right-rear — contains a dedicated inverter powering hub motors and auxiliary loads via HFAC, with the zones operating in parallel. The approach reduces harness weight and count, enables power-line carrier communication over the same conductors, and is compatible with legacy 14V/42V devices. South China University of Technology (SCUT) holds the most extensive multi-jurisdiction portfolio in this cluster, with filings in CN (2016, 2017, 2023), US (2018, 2022), and SG (2018, 2019). No OEM production deployment of HFAC distribution has been documented in this dataset, placing this cluster in an academically active but commercially unproven position.

Cluster 2: Centralized and platform HV bus architecture

This cluster covers the design of the main HV power distribution backbone — including HV distribution box topology, integration of charging interfaces (AC/DC), motor drive connections, and thermal/HVAC loads. A key trend is platform unification: Chery New Energy Automobile’s 2019 and 2022 CN patents address four-wheel-drive to two-wheel-drive dynamic switching on a unified HV architecture. NIO’s 2022 CN utility model explicitly targets reduced cable length, lower line losses, and reduced cost through integration of the power distribution unit, drive electronics, and charging subsystems into two integrated power assemblies. Lantu Automobile Technology (2024, CN) and Volkswagen China (2026, CN) represent the most recent filings in this cluster.

Cluster 3: HV cable design, routing, and thermal management

Patents in this cluster address the physical cable: insulation layers, electromagnetic shielding, wear-detection capability, and novel thermal management. The most advanced 2025 filing from Hydro Extruded Solutions (WO) embeds a heat pipe within the hollow conductor of the HV cable, with the evaporation zone inside the conductor and the condensation zone external — enabling passive cooling during high-current charging events. Oshkosh Corporation’s 2024 US patent adds detection layers within or around the cable sheath to monitor damage or wear location. TVS Motor Company’s 2020 WO patent addresses the routing separation of high and low voltage harnesses to minimise EMC interference. Cable thermal management has moved from a peripheral concern to a central design constraint as 800V platforms and 350–800kW ultra-fast charging sessions become standard, a trend tracked by standards bodies including IEC in their EV charging interface standards work.

Cluster 4: HVIL safety systems and fault diagnostics

High voltage interlock loops are mandated safety circuits in EV HV systems. Traditional implementations rely on physical wire loops threading through every HV connector. The most recent innovation, filed by International Truck Intellectual Property Company in both 2025 and 2026 under active US status, eliminates the dedicated HVIL wire by using software-based status verification of HV rails between the RESS, HVDB, and HV loads — reducing wiring complexity and failure points. This approach is explicitly positioned for commercial EV applications including heavy-duty trucks, where interlock wiring multiplicity in multi-zone 800V platforms becomes unmanageable. Safety requirements for HVIL systems are codified in standards published by ISO, including ISO 6469 on safety requirements for electric vehicles.

“The most recent HVIL innovation eliminates the dedicated interlock wire entirely — replacing physical loops with software-based HV rail status verification across the RESS, HVDB, and HV loads.”

Geographic and assignee landscape: China leads, US holds safety depth

Among the retrieved patent records, China (CN) is the dominant filing jurisdiction by volume, accounting for approximately 40% of all patent records, followed by the United States (US) at roughly 35%, with EP, WO, and SG making up the remainder.

Chinese OEM and research institution filings — SCUT, Chery, NIO, Lantu, Volkswagen China, First Auto Works — collectively represent the most active innovation cluster in HV architecture, reflecting China’s position as the largest EV market globally, a structural trend documented by the IEA in its annual Global EV Outlook. US-based innovation is concentrated in safety systems (HVIL, discharge circuits), commercial EV platforms, and charging infrastructure communication.

Honeywell’s foundational portfolio (2006–2012) is now largely inactive, suggesting IP white space in legacy redundant bus topologies. ABB’s active multi-jurisdiction EVSE communication portfolio — spanning WO, US, and EP — represents a tightly held position in the Ethernet-over-basic-interface space. The company’s patent family covers the replacement of power-line communication (PLC) with Ethernet for high-level communication between EVSE and EVs, enabling standardised V2G messaging, load balancing, and charging session control regardless of plug type (CCS, CHAdeMO, GB/T). Freedom-to-operate analysis against this family is essential for any EVSE developer transitioning from PLC to Ethernet HLC, a shift increasingly encouraged by standards bodies including the SAE.

Five emerging directions shaping 2025–2026 filings

Five forward-looking signals are identifiable from filings dated 2024–2026 in this dataset, each targeting a different constraint in current EV HV wiring systems.

• Thermally managed HV cables (Hydro Extruded Solutions, WO, 2025): Embedding heat pipes within hollow conductor HV cables to passively manage Joule heating during 350–800kW ultra-fast charging sessions. The evaporation zone sits inside the conductor and the condensation zone is external, enabling passive cooling without active liquid cooling of the cable itself — directly addressing one of the most acute bottlenecks at 800V platform charging.
• Software-defined HVIL elimination (International Truck IP Co., US, 2025–2026): Replacing physical interlock wire loops with software-based rail status monitoring across the RESS, HVDB, and HV loads. This reduces connector complexity, weight, and failure probability — a key enabler for 800V multi-zone commercial EV platforms.
• V2V charging via DC-DC converter architecture (General Motors, CN, 2025): Incorporating a bidirectional DC-DC converter between the DC fast-charge inlet and the main HV traction bus to enable vehicle-to-vehicle charging at regulated voltages, operating in bypass mode during normal charging station use. This re-purposes existing HV wiring as a bidirectional energy conduit.
• Integrated HV control modules replacing distributed wiring (Volkswagen China, CN, 2026): Consolidating HVDC converters, PDUs, OBCs, and power modules behind a single integrated control chip with unified battery and motor interfaces — directly addressing harness proliferation in compact A-segment vehicles.
• Dynamic distributed HV architecture for eVTOL (Supernal LLC, WO, 2026): Extending automotive HV wiring logic into aerial vehicle power management, requiring real-time reconfiguration of power paths in response to mid-flight battery or motor faults. Shanghai Shide Technology (CN, 2025) also filed a pending application describing an integrated battery control unit architecture for eVTOL, including HV distribution bus, solid-state power controllers, and pre-charge circuits.

Strategic implications for IP and R&D teams

The patent landscape reveals five actionable strategic considerations for IP counsel, R&D leaders, and technology strategists working in the EV HV wiring space.

800V platform readiness is the defining design challenge. Cable thermal management (Hydro Extruded Solutions’ heat-pipe cable), sheath wear detection (Oshkosh), and HVIL software elimination (International Truck) are all direct responses to the physical and safety demands of 800V operation at high charge rates. R&D teams not yet aligned to 800V thermal and safety requirements face near-term obsolescence risk. Insights on EV platform migration trends are available through PatSnap’s IP intelligence solutions.

China dominates HV architecture IP volume but not safety system depth. Chinese assignees lead in platform architecture patents — integrated modules, 2WD/4WD flexibility, REEV routing — while US assignees hold active positions in cable-level safety and fault management. Western IP strategists should monitor CN filings closely for freedom-to-operate risks in architecture claims. PatSnap’s patent analytics platform provides real-time CN filing monitoring and machine translation.

The HFAC distribution concept remains academically active but commercially unproven. SCUT holds an extensive multi-jurisdiction HFAC patent portfolio (2016–2023), but no OEM production deployment has been documented in this dataset. The concept’s potential for harness weight reduction warrants licensing interest, but competitive risk appears low in the near term.

ABB’s Ethernet-over-basic-interface position is a potential chokepoint for EVSE-EV communication standardisation. With active patents in WO, US, and EP covering Ethernet as the HLC layer, any EV charging system developer moving away from PLC to Ethernet HLC must assess freedom-to-operate against this patent family before committing to architecture decisions.

eVTOL is an emerging adjacency requiring purpose-built HV wiring IP. The 2025–2026 filings from Supernal and Shanghai Shide Technology demonstrate that automotive HV wiring concepts are being ported into the aerial EV domain with significant architectural modifications — dynamic reconfiguration, solid-state power controllers, dual-bus pre-charge. Companies with automotive HV wiring portfolios have a first-mover opportunity to extend IP into eVTOL before the space matures. The eVTOL sector’s growth trajectory is monitored by aviation regulators including EASA, whose Special Condition for VTOL certification covers airborne power system safety requirements directly relevant to HV wiring architecture.