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Engineered for high-voltage junction boxes and power distribution units in EV and energy storage systems
A Module-To-Module (M2M) Connector is a precision interconnect component designed to electrically and mechanically join battery modules, power distribution units (PDUs), and high-voltage (HV) junction boxes within electric vehicles, stationary energy storage systems, and industrial power platforms. Unlike traditional wire harness assemblies, M2M connectors provide direct, low-resistance, vibration-tolerant connections between adjacent modules — reducing energy loss, simplifying assembly, and dramatically improving system reliability in demanding environments.
In modern EV battery packs, a single vehicle may contain dozens of individual battery modules interconnected through a network of M2M connectors routed through the HV junction box and PDU. Each connector must reliably carry currents ranging from 80A to over 500A at voltages up to DC 1500V, while withstanding thermal cycling, mechanical shock, and chemical exposure over a vehicle lifetime exceeding 15 years or 300,000 km.
The evolution from conventional cable-based interconnects to direct module-to-module connector systems represents one of the most significant advances in power electronics packaging of the past decade. By eliminating intermediate wiring, engineers achieve higher power density, lower contact resistance (typically below 0.5 mΩ), and dramatically reduced assembly time — factors that translate directly into lower manufacturing costs and improved vehicle range.
For Power Distribution Units (PDUs) and HV Junction Boxes, the connector must also integrate seamlessly with busbars, fuses, contactors, and current sensors, making design compatibility and dimensional precision equally as important as electrical performance. SANCO's module-to-module connector series is engineered to address all these requirements with a comprehensive portfolio spanning multiple current ratings, contact configurations, and sealing grades.
Why SANCO Module-To-Module Connectors outperform conventional interconnect solutions
Full ingress protection against dust and high-pressure water jets, ensuring reliable operation in underbody and exposed HV junction box environments across all climate zones.
Supports continuous current ratings from 80A to 500A+ with ultra-low contact resistance, enabling compact module-to-module power transfer without thermal derating.
Integrated finger-proof contact protection and secondary locking mechanisms prevent accidental disconnection and ensure safe handling during EV service and maintenance.
Compatible with crimping, welding, and flexible busbar connection methods, providing maximum design freedom for PDU architects and battery pack engineers.
Rated from -40°C to +125°C, with housing materials and seal compounds selected for long-term thermal stability in battery pack and junction box enclosures.
Products certified to UL, TUV, IATF 16949, ISO 9001 and other international standards, meeting OEM requirements across North America, Europe, and Asia-Pacific markets.
The global demand for high-performance M2M connectors is accelerating across multiple sectors
The global high-voltage connector market for electric vehicles and energy storage systems was valued at approximately USD 3.2 billion in 2023 and is projected to exceed USD 9.8 billion by 2030, growing at a CAGR of over 17%. Module-to-module connectors specifically designed for PDUs and HV junction boxes represent one of the fastest-growing segments within this market, driven by the rapid proliferation of battery electric vehicles (BEVs), plug-in hybrid electric vehicles (PHEVs), and grid-scale energy storage installations.
In the automotive sector, the transition to 800V battery architectures — pioneered by manufacturers such as Hyundai, Porsche, and Lucid Motors — has fundamentally changed the requirements for M2M connectors. At 800V, even marginal increases in contact resistance generate significant heat, making ultra-low resistance, high-precision connectors not merely desirable but essential for system safety and efficiency. This architectural shift has triggered a wave of redesigns across the connector supply chain, with tier-1 suppliers and OEMs demanding next-generation solutions.
Simultaneously, the energy storage industry is experiencing explosive growth. Utility-scale battery energy storage systems (BESS) now regularly deploy hundreds of megawatt-hours of capacity, with individual rack-level PDUs managing power flows exceeding 1 MW. The connectors linking battery modules within these systems must handle not only high continuous currents but also the transient surge currents associated with grid stabilization and fast-response frequency regulation services.
The industrial sector — encompassing automated guided vehicles (AGVs), heavy-duty electric machinery, marine electrification, and railway traction systems — adds further demand for ruggedized M2M connectors capable of surviving extreme mechanical environments while maintaining the electrical integrity required by modern power electronics.
As automotive OEMs race to reduce charging times and improve drivetrain efficiency, the industry-wide shift to 800V and emerging 1000V+ platforms demands connectors with enhanced dielectric strength, reduced creepage distances, and advanced arc-fault protection — all while maintaining the compact form factors required by modern battery pack designs.
Revolutionary battery architectures that eliminate module-level housings in favor of direct cell-to-pack integration are reshaping connector design requirements. M2M connectors must now interface directly with cell contact systems (CCS), requiring sub-millimeter positional accuracy and integration with thermal management interfaces.
The integration of embedded sensors, RFID identification, and real-time condition monitoring into connector assemblies is emerging as a key differentiator. Smart M2M connectors can report connection quality, temperature, and contact resistance data to battery management systems, enabling predictive maintenance and improving overall system safety.
Weight reduction pressures in EV design are driving adoption of high-performance engineering polymers, aluminum alloy contacts, and composite busbar materials. Simultaneously, the industry is moving toward halogen-free, recyclable housing materials to meet increasingly stringent environmental regulations in the EU and China.
As battery pack manufacturing scales to millions of units annually, connectors must be designed for robotic assembly with precise mating force profiles, visual alignment features, and audible/tactile confirmation of correct locking — all while maintaining the high IP ratings required for automotive-grade applications.
Industry consortia and regulatory bodies are pushing for standardized connector interfaces to enable second-life battery applications and cross-manufacturer interoperability in energy storage systems. Suppliers who proactively align with emerging IEC, SAE, and GB/T standards will gain significant competitive advantage in the evolving market.
Module-To-Module connectors serve as the backbone of high-voltage power architecture across diverse industries
In a typical 400V–800V EV battery pack, 12 to 24 battery modules are connected in series-parallel configurations through a central PDU. M2M connectors provide the critical electrical path between modules, with the PDU housing fuses, contactors, current sensors, and the HV junction box. SANCO's ES-series connectors are specifically optimized for this application, featuring positive-locking mechanisms that survive the vibration and shock profiles defined by automotive standards including LV214 and ISO 16750.
In utility-scale battery energy storage systems, each rack-level PDU manages power from 8 to 16 battery modules, with M2M connectors carrying currents up to 500A at DC 1500V. The harsh environment of outdoor BESS installations demands IP67 or higher sealing, UV-resistant housing materials, and corrosion-resistant contact plating. SANCO's DC 1500V certified connectors meet these requirements while providing the high cycle life (10,000+ mate/unmate cycles) needed for modular BESS designs that support battery replacement and upgrade programs.
Electric buses, heavy trucks, and construction equipment operate under extreme conditions with high vibration, wide temperature swings, and exposure to water, dust, and chemicals. HV junction boxes in these vehicles must integrate M2M connectors that maintain reliable electrical contact over multi-year service intervals. SANCO's high-current connectors with flexible busbar termination options provide the mechanical compliance needed to accommodate thermal expansion and chassis flex in heavy commercial vehicle applications.
AGVs in modern manufacturing facilities require compact, high-power-density battery systems capable of rapid charging between operational cycles. M2M connectors in AGV PDUs must withstand continuous vibration from factory floor operations while providing the low contact resistance needed to minimize heat generation in tightly packaged battery enclosures. The connector's mating interface must also accommodate the positional tolerances inherent in automated battery swap systems.
Electric ferries, offshore service vessels, and marine hybrid propulsion systems present unique challenges for M2M connector design. Saltwater spray, condensation, and the corrosive marine atmosphere demand superior sealing and contact materials. SANCO's connectors with gold or silver alloy contact plating and double-seal designs provide the long-term corrosion resistance required for marine HV junction box applications, supporting the rapid electrification of short-sea shipping routes.
Modern electric and hybrid railway rolling stock uses sophisticated power distribution architectures with multiple HV junction boxes managing traction power, auxiliary systems, and regenerative braking energy. M2M connectors in rail applications must comply with EN 45545 fire performance standards while providing the high vibration resistance (up to 5g continuous) defined by railway equipment standards. SANCO's rail-certified connector solutions support both new-build and retrofit programs across metro, light rail, and mainline applications.
Founded in 1999, SANCO is well known as a connection system solutions provider and a national high-tech enterprise integrating R&D, design, manufacturing, sales and after sales support for connectivity products. It is committed to becoming a leader in the field of connectivity technology and products.
SANCO specializes in the R&D and manufacturing of electrical interconnection systems for automotive, rail transit, industrial, communications, and energy storage applications, including: high voltage EV connector, energy storage connector, EV charging connectors, manual service disconnect (MSD) units, Laminated busbar, Injection-molded busbar, signal and circular connectors, cell contact systems (CCS) and various precision components.
As a prominent industry leader, SANCO delivers comprehensive connection system solutions to clients worldwide. Our products are exported to over 100 countries worldwide, including major markets like China, North America, Europe, and Asia-Pacific. Our solutions have been widely adopted by global Fortune 500 companies and industry-leading enterprises.
SANCO has a complete industrial chain, advanced autonomous R&D capabilities, precision manufacturing systems and certified testing infrastructure, which can fully meet the various customized requirements of customers. Guided by our core values of Integrity, Customer-Centricity, Precision Excellence, and Innovative Learning, SANCO is relentlessly advancing as the global leader in connectivity technologies and solutions.
SANCO was founded by Mr. Zeng Zhi Jian in 1999. Through years of R&D and manufacturing expertise in high-voltage interconnection systems, SANCO has established itself as a technology leader, delivering comprehensive connectivity solutions across industries. From the earliest days of automotive connector manufacturing to today's cutting-edge module-to-module connector systems for EV power distribution units and HV junction boxes, SANCO's journey reflects the transformation of the global electrification industry itself.
Today, SANCO's module-to-module connectors power some of the world's most advanced electric vehicles, grid-scale energy storage systems, and industrial power platforms — a testament to over two decades of uncompromising commitment to engineering excellence and customer partnership.
Partner with SANCO for module-to-module connectors engineered for power distribution units and HV junction boxes — trusted by Fortune 500 companies across 100+ countries.
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