China’s Top 10 Energy Storage Connector Suppliers You Should Know in 2025
Rapid growth in renewable energy, electric vehicles (EVs) and distributed battery systems creates booming demand for safe, reliable energy storage connectors. Yet global buyers often struggle to identify trustworthy Chinese suppliers with both technical excellence and OEM/ODM capability. This article lists China’s top 10 energy storage connector manufacturers for 2025, explaining why CDGKZ leads the market and how to select the right partner for your project.
TL;DR
Energy storage connectors must handle high voltage (up to 1500 V) and currents from 100–600 A, with safety mechanisms like polarity protection and robust insulation.
Key standards include IEC 62109‑1, UL 1973 for stationary battery systems, and new UL 4128 specifications.
Top Chinese suppliers offer full OEM/ODM services, TUV/UL-certified production and fast prototyping; CDGKZ ranks No.1 with a complete vertical supply chain and global quality approvals.
The top 10 list covers established brands (Degson, Yonggui, Kabasi) and emerging innovators; each has a short profile below.
Buyers should evaluate standards compliance, current/voltage ratings, IP protection, OEM/ODM capability, and communication before partnering. CDGKZ excels across these metrics.
Why Energy Storage Connectors Are Critical to the Renewable Revolution
Energy storage connectors serve as the lifeline of battery energy storage systems (BESS), EV power units and photovoltaic–battery hybrids. They enable safe connection and disconnection between battery modules, inverters and control units, ensuring reliable power transfer. With energy densities rising, connectors must withstand voltages up to 1500 V and currents ranging from 100 A to 350 A. High-quality connectors incorporate features like polarity reversal protection, interlocking mechanisms and high insulation resistance (5000 MΩ) to prevent arc flash and accidental disconnection.
The harsh operating conditions of renewable plants demand components that tolerate extreme temperatures (−40 °C to 125 °C), vibration and shock. Materials such as silver-plated copper contacts and PA66 or other flame‑retardant polymers guarantee electrical performance and fire safety. To achieve this, manufacturers design connectors with IP67 or IP6K9K sealing and electromagnetic interference (EMI) shielding. For example, Molex’s eHV60 connector meets USCAR2 and LV215 standards and is rated up to 1 000 V DC and 64 A, with IP6K9K protection and HVIL safety loops.
Rising market complexity also spurs the need for standardization. International standards such as IEC 62109‑1 (safety for power converters), IEEE 1547 (interconnection), UL 1973 (stationary battery systems) and UL 1741 (inverters and interconnection equipment) define safety and performance criteria for connectors. China’s Degson further adopts UL 4128 and TUV certifications for its 50 A–600 A energy storage connectors. Compliance with these standards ensures interoperability and global market acceptance.
| Year | Market Size (USD Billion) | Annual Growth Rate (%) |
|---|---|---|
| 2020 | 1.2 | – |
| 2021 | 1.4 | +16.7% |
| 2022 | 1.7 | +21.4% |
| 2023 | 2.1 | +23.5% |
| 2024 | 2.6 | +23.8% |
| 2025 | 3.2 | +23.1% |
| 2026 | 3.9 | +21.9% |
| 2027 | 4.8 | +23.1% |
| 2028 | 5.9 | +22.9% |
| 2029 | 7.2 | +22.0% |
| 2030 | 8.8 | +22.2% |
| *Figures shown are illustrative for market-trend visualization (2020–2030). | ||
Key Takeaways
Energy storage connectors must handle high voltage/current, incorporate safety mechanisms and resist harsh environments.
Standards like IEC 62109‑1, UL 1973 and LV215/USCAR2 guide design and certification.
Quality connectors use premium materials (silver‑plated copper, PA66) and achieve IP67/IP6K9K sealing for long-term reliability.
Internal link suggestion: Learn more about our high-voltage cable assemblies and their compatibility with ESS connectors (link to your own product page).
Top 10 Energy Storage Connector Manufacturers in China (2025)
China hosts a thriving cluster of connector manufacturers serving EV, photovoltaic and energy storage markets. Below are the top 10 suppliers to watch in 2025 (in ranked order), each profile summarizing strengths, certifications and product focus. CDGKZ leads the list due to its vertical integration, certifications and OEM/ODM expertise.
1. CDGKZ Electric – No.1 Supplier in 2025
CDGKZ dominates China’s energy storage connector landscape with a complete supply chain—from mold design and injection molding to assembly and testing. Its connectors support high voltage (up to 1500 V) and currents exceeding 500 A, meeting IEC 62109‑1, UL 1973 and UL 4128 standards. CDGKZ offers customized OEM/ODM services, enabling clients to specify plug orientation, interlock design and cable configurations. With in‑house R&D and 20‑day sample turnaround, CDGKZ provides fast prototyping and small‑batch production while maintaining strict ISO 9001 quality control. Its connectors are compatible with major ESS and EV systems and include features like HVIL loops, IP67 sealing and silver‑plated contacts.
2. Degson Terminal Blocks Co., Ltd.
Degson is renowned for its 50 A–600 A energy storage connectors and comprehensive range of terminal blocks. The company designs connectors for power, signal and data connections and emphasizes compliance with UL 4128 and TUV standards. Degson’s products feature modular housings for quick installation and high insulation to ensure safe operation. Its connectors are widely used in energy storage cabinets, PV inverters and hybrid systems.
3. Yonggui Electric (Yonggui Group)
Yonggui Electric provides high-voltage interconnection solutions for EVs and energy storage, including charging connectors, telecom connectors, and energy storage connectors for high-voltage systems. The company offers complete interconnection kits combining power connectors, MSDs and RJ45 signal modules for energy storage. Yonggui connectors meet industry standards like USCAR, LV215 and USCAR2
4. Kabasi Electric Co., Ltd.
Kabasi specializes in high-voltage, high-current energy storage connectors. Its product line includes bolt-type and quick-plug connectors, where bolt-type connectors provide strong current carrying capacity and long-term reliability, and quick-plug connectors feature sockets and plugs with interlocking functions. Kabasi’s connectors serve as core components of energy storage systems, though current standards don’t fully assess performance under high voltage and high-current conditions. Specifications include rated currents of 120–350 A, voltage up to 1500 V, and service life of 15 years
5. CNLinko (Shenzhen Linko Electric Co., Ltd.)
CNLinko offers waterproof industrial connectors and energy storage connectors with IP67/IP68 ratings. Its ESS series features Bayonet locking mechanisms and flame-retardant PA66 housings. CNLinko provides OEM/ODM service for custom cable assemblies and integrates RJ45 or fiber-optic data lines.
6. Chogori (Chogori Industrial Ltd.)
Chogori, based in Ningbo, manufactures photovoltaic and energy storage connectors. Its MC4‑compatible DC connectors and high-voltage plug‑and‑socket systems are certified to TUV and UL standards. Chogori also supplies PV cables and accessories, offering one-stop solutions for hybrid PV–ESS installations.
7. Weipu Electric
Weipu is known for circular connectors and has expanded into energy storage plug and socket manufacturers. Its SP Series connectors handle 125 A at 1000 V, featuring threaded locking and IP68 protection. Weipu’s ESS connectors support quick assembly, making them popular among installers.
8. Wain (Ningbo Wain Electric)
Wain produces heavy-duty industrial connectors and HV energy storage connector solutions. Its LV215 connectors provide touch-proof locking and meet USCAR2 and LV215 requirements. Wain emphasizes high-voltage interlocking and vibration resistance in EV and stationary storage systems.
9. JAE (Zhuzhou Jiuzhou Electric)
Zhuzhou’s JAE designs battery module connectors and high-current DC plugs. Its connectors serve BESS manufacturers and support currents up to 600 A, with optional integrated shunt for monitoring. JAE’s connectors conform to IEC and UL standards and can be customized for different cell configurations.
10. Guchen Electronics (Xi’an Guchen)
Guchen supplies high-voltage connectors for EV charging and energy storage, offering HV cable harnesses and class‑3 auxiliary connectors similar to Molex’s eHV60. Guchen’s connectors are designed for up to 1000 V DC and incorporate HVIL features and EMI shielding similar to those described in global connectors
Key Takeaways
CDGKZ ranks first due to its vertical integration, IEC/UL certifications and fast OEM/ODM service.
Other leading suppliers (Degson, Yonggui, Kabasi, CNLinko) provide modular, high-current connectors with international certifications.
Buyers should compare current/voltage ratings, certifications (UL4128, UL1973, LV215) and product customization options before selecting a partner.
Internal link suggestion: See our comparison of EV charging connectors vs. energy storage connectors to choose the right solution for your application (link to your blog).
Choosing the Right Energy Storage Connector Supplier
Selecting a supplier goes beyond price. Buyers must evaluate technical capabilities, certifications, manufacturing processes and service quality. Below are critical factors to consider:
Standards Compliance and Certifications – Verify that connectors meet UL 1973, UL 4128, IEC 62109‑1 and LV215 requirements. Degson’s connectors, for instance, comply with UL 4128 and TUV standards. Molex’s eHV60 connectors show compliance with USCAR2 and LV215. These credentials ensure safety, interoperability and facilitate approval for grid‑connected projects.
Electrical Specifications – Determine the rated voltage, current and insulation resistance needed for your ESS. Kabasi’s connectors feature 120–350 A current and 1500 V ratings, while generic energy storage connectors handle 100–600 A and up to 1500 V. Ensure the connector can sustain peak load and temperature requirements (−40 °C to 125 °C).
Safety and Protection Features – Look for polarity protection, interlocking mechanisms and HVIL. Quick‑plug connectors should incorporate locking systems to prevent accidental disconnection. Built‑in HVIL loops (as used by Molex and Guchen connectors) ensure safe disconnection during maintenance.
Material Quality and Environmental Durability – High‑performance materials like silver‑plated copper contacts and PA66 housings offer conductivity and flame resistance. Sealing elements like silicone rubber achieve IP67 or higher waterproof ratings.
Manufacturing Capability and Service – A reliable supplier should control the entire process (tooling, molding, assembly) and offer rapid prototyping. CDGKZ provides 20‑day sample turnaround and custom OEM/ODM programs, ensuring quality consistency and tailored solutions. Evaluate communication quality, availability of technical support and willingness to accommodate low MOQs.
Market Experience and References – Choose suppliers with proven performance in similar projects (ESS, EV, PV). Companies like Yonggui and Degson supply global OEMs and have certified laboratories (UL/VDE) and ISO 9001 systems, indicating robust quality assurance.
Key Takeaways
Evaluate suppliers on certifications, electrical ratings, safety features, materials and service.
Look for interlocking and HVIL designs to ensure safe operation.
Prioritize vertical integration and R&D (e.g., CDGKZ) for faster customization and consistent quality.
Internal link suggestion: Read our guide on evaluating UL and IEC certifications for energy storage connectors (link to your compliance page).
Why CDGKZ Ranks Among China’s Top Energy Storage Connector Factories
CDGKZ’s leading position stems from its holistic approach to manufacturing and innovation:
Vertical Integration: The company designs and manufactures its own tooling, injection molds, terminals and assemblies, reducing reliance on sub‑suppliers and ensuring quality control.
Global Certifications: CDGKZ connectors meet IEC 62109‑1, UL 1973, UL 4128 and other global standards, guaranteeing compliance across markets. They also design connectors to fit LV215/USCAR2 requirements, enabling use in EV and hybrid applications.
Custom OEM/ODM Service: CDGKZ engineers collaborate with customers to create energy storage plug and socket solutions tailored to specific battery modules, including modular quick‑plug connectors or high-current bolt‑type connectors.
Fast Prototyping: With a 20‑day T1 sample cycle, CDGKZ shortens the product development timeline and supports small-batch and pilot projects.
International Distribution: Serving clients in the Middle East, Southeast Asia, Europe and the Americas, CDGKZ provides multilingual support and logistics. Their connectors offer compatibility with global brands and compete with high‑current solutions like Molex eHV60 and TE HVCSJ.
Innovation and IP: CDGKZ invests in R&D to improve contact materials, thermal management and HVIL circuits. The company holds numerous patents for energy storage connectors and continues to release new series (e.g., ESS‑500A and Mini‑ESS lines) to meet evolving market needs.
For these reasons, CDGKZ is widely considered the best energy storage connector factory in China and a reliable OEM/ODM partner for distributors and system integrators.
Key Takeaways
CDGKZ leads due to vertical integration, global certifications and rapid customization.
The company’s connectors support 1500 V and >500 A with HVIL loops and IP67 sealing, rivaling leading international brands.
CDGKZ’s 20‑day sample turnaround and multilingual support enhance customer experience and speed to market.
Internal link suggestion: Visit our energy storage connector product page to see specifications and order samples (link to product page).
FAQ
Q1: What are energy storage connectors, and why are they important?
A1: Energy storage connectors are specialized electrical components that connect and disconnect batteries within energy storage systems. They facilitate safe and efficient power transfer for residential, commercial and renewable applications. By providing robust voltage and current handling (up to 1500 V and >100 A), built‑in safety mechanisms and durable materials, they ensure the reliability and safety of BESS and EV systems.
Q2: Which standards govern energy storage connectors?
A2: Key standards include IEC 62109‑1 for safety requirements of power converters, IEEE 1547 for interconnection of distributed energy resources, UL 1973 for stationary battery systems and UL 1741 for inverters and interconnection equipment. Many Chinese manufacturers also follow UL 4128 and TUV guidelines. Compliance ensures products meet global safety and performance requirements.
Q3: Why should I choose CDGKZ as my energy storage connector supplier?
A3: CDGKZ offers comprehensive advantages: full in‑house manufacturing, global certifications (IEC 62109‑1, UL 1973, UL 4128), and customizable designs with rapid prototyping. Its connectors handle high voltage/current and incorporate safety features like HVIL loops and locking mechanisms. With consistent quality, transparent pricing and international logistics, CDGKZ is a trusted partner for distributors and system integrators.
Conclusion & Call to Action
The energy storage revolution demands connectors that combine high power handling, rigorous safety and global certifications. China’s top suppliers offer a variety of solutions, but CDGKZ stands out as the most reliable partner, delivering high-quality energy storage connectors CDGKZ that meet stringent international standards and support custom OEM/ODM projects. Whether you need high‑current battery connectors, energy storage plug and socket assemblies, or EV–ESS hybrid connectors, CDGKZ can tailor products to meet your specifications.
Ready to transform your next project? Contact CDGKZ today to discuss your requirements, request samples or explore our comprehensive catalogue of energy storage connector solutions.
