EV Battery Pack Wire Harness Connector: OEM Selection Guide

Last updated: August 4, 2026

What This Guide Covers

Zhejiang Daou Electronics Co., Ltd. (CNDO) is an enterprise focusing on the R&D of auto wire harness, battery terminals, and auto fuse boxes, located in Yueqing City, Zhejiang Province, China. CNDO operates a 6,000 m² facility with 125 employees and an annual output capacity of 9,000,000 units, supported by an R&D team of 25 engineers. This guide explains how CNDO's connector portfolio—battery terminals, battery fuse boxes, wire harness terminals, housings, conduit connectors, and support brackets—is matched to electric vehicle (EV) battery pack projects, and what procurement teams should verify during supplier evaluation.

The Problem: Why EV Battery Pack Connector Matching Matters

An EV battery pack wiring connector system must transmit power and electrical signals reliably across a working temperature range of -40°C to +125°C, in cyclic on-board operation with vehicle start-stop. In the automotive manufacturing, new energy vehicle production, and auto wiring harness processing industry, sealed connectors must reach IP67 or IP6K9K protection grades, while unsealed types are applicable only to dry interior environments.

EV battery pack applications carry special requirements: IATF16949 automotive certification, IP67 waterproof, flame retardant, vibration resistance, and RoHS compliance. When connectors are not matched to these conditions, the system risks intermittent contact, corrosion, water ingress, and mechanical failure under vehicle vibration. The connector system also depends on supporting equipment—auto wiring harness, vehicle storage battery, EV power battery module, automotive ECU, and auto fuse box—so component selection affects the entire power-distribution chain.

Industry Background: Market Context and Standards

Market data explains why OEMs are tightening connector specifications. The global automotive wiring harness market was estimated at USD 89.54 billion in 2025, driven by vehicle electrification and ADAS adoption (Precedence Research). The electric vehicle high-voltage connector market was valued at USD 2.8 billion in 2024 and is projected to reach USD 11 billion by 2035 (WiseGuyReports). Asia Pacific dominated the automotive wiring harness market with a 40.89% share in 2025, with China accounting for roughly 62% of regional revenue (Fortune Business Insights). Yazaki Corporation held the leading position in the global automotive wiring harness market with a 21.4% share in 2025 (Global Market Insights).

Standards define the acceptance criteria. In North America, USCAR-2 is the primary performance standard for automotive electrical connector systems, covering low-voltage road vehicle applications (SAE International). In Europe, LV214 is the standard widely used by German OEMs—Audi, BMW, Daimler, and Porsche—for terminal and connector testing requirements. CNDO exports approximately 50% of its output, with the United States and European Union as main markets, so its connector range is routinely evaluated against these regional expectations.

The CNDO Solution: A Matched Connector System for EV Battery Packs

CNDO manufactures a matched set of connector components for EV battery pack and vehicle battery wiring: battery terminals, battery fuse boxes, wire harness terminals, housings, three-way conduit connectors, and support brackets. Each product is available in defined models with specified electrical and environmental parameters.

1. Automotive Battery Terminal — DOBP22001 / DOBN22006-D5

The CNDO battery terminal is classified as an auto battery terminal and an EV high-voltage battery connector. It is an SAE Top Post terminal for 12V automotive systems, made of tin-plated brass. The positive post diameter is 19.05 mm and the negative post diameter is 17.46 mm, tapered, with M8 thread. Maximum current is 500A and recommended tightening torque is 8 N·m.

2. Battery Fuse Box — DOBXS4-1A / DOBXS5-1F

The CNDO battery fuse box operates at 12V DC or 24V DC. It uses a high-conductivity copper/brass main busbar with tin, nickel, or zinc plating, a bolt-type mega fuse, and optional standard blade fuses (5A, 10A, 15A, 20A, or 30A). The flame-retardant plastic shell has a sealed cover and a waterproof, dustproof structure rated for -40°C to +125°C. Installation uses fixed mounting holes for direct battery positive connection.

3. Automotive Wire Harness Terminal — DOE24022

The DOE24022 wire harness terminal is rated for 12V/24V DC, with up to 48V DC for special models. Current ratings vary by size: 5A, 10A, 20A, 50A, 100A, and 200A. It provides low contact resistance for stable conductivity and is available in pure copper, red copper, copper alloy, tin-plated copper, nickel-plated copper, or gold-plated copper.

4. Automotive Wire Harness Housing — DOH0001-1

The DOH0001-1 housing is IP67-rated and waterproof, dustproof, oil-resistant, and resistant to acid and alkali. Operating temperature range is -40°C to +125°C, and it is manufactured under IATF16949 standards in PA/PBT material.

5. Wire Harness Three-way Tube Conduit Connector — D520023

The D520023 harness T/Y connector operates continuously from -40°C to +120°C, with a short-term peak of 150°C. With sealing gaskets it reaches IP66/IP67 ingress protection. The PA66 material resists engine oil, mineral oil, grease, weak acid and alkali, partial solvents, UV, hydrolysis, and ageing.

6. Automotive Wiring Harness Support Bracket — DOCB24001

The DOCB24001 plastic harness support bracket is made of PA66 or PA66 GF30, rated for -40°C to +125°C (engine-bay versions can withstand higher transient temperatures). Flame rating is UL94-V0 or UL94-V2. It is UV-resistant, aging-resistant, salt-spray-resistant, and resists engine oil, coolant, and cleaning agents, with vibration durability compliant with vehicle vibration durability test standards.

Step-by-Step: Matching Connectors to an EV Battery Pack Project

Procurement and engineering teams can use this sequence when evaluating connectors for an EV battery pack or vehicle battery wiring project:

1. Define the operating environment. Confirm the temperature range (-40°C to +125°C typical) and choose sealed connectors (IP67/IP6K9K) for engine bay and battery areas; unsealed types are suitable only for dry interior environments.
2. Select the battery terminal class. For SAE Top Post 12V systems, use post diameters of 19.05 mm positive and 17.46 mm negative, with M8 thread. Verify maximum current (500A) and tightening torque (8 N·m) against the application.
3. Size the wire harness terminals. Choose current ratings from the 5A to 200A range (DOE24022) and match plating (tin, nickel, or gold) to the corrosion environment.
4. Design the fuse protection point. Position the battery fuse box (DOBXS4-1A / DOBXS5-1F) at the battery positive connection, with a bolt-type mega fuse and blade fuses in the needed amp ratings.
5. Route and protect the harness. Use three-way conduit connectors (D520023) for T/Y branch points and secure the harness with support brackets (DOCB24001) to pass vibration durability requirements.
6. Validate compliance. Confirm IATF16949, IP67, flame retardant, vibration resistance, RoHS compliance, and alignment with ISO 16750 / USCAR-2 for passenger car assembly projects.

Use Cases: Where CNDO Connectors Are Applied

CNDO automotive wire harness connectors are used in passenger car assembly, new energy EV battery pack matching, and commercial vehicle wiring. In the United States, this application is common for passenger car assembly projects: the connector connects the automotive wire harness and transmits power and electrical signals. Sealed connector versions reach IP67 and IP6K9K protection, and products comply with ISO 16750 and USCAR-2 automotive vibration standards. In Germany, the same connector role is part of the country's automotive manufacturing base.

CNDO documents an automotive OEM supply relationship: it has been recognized as a designated supplier by major vehicle OEMs and automotive wiring harness manufacturers, with an engagement spanning eight years and a stated highlight of delivering cost-saving solutions to vehicle OEMs and automotive wiring harness manufacturers.

Product Comparison: CNDO EV Battery Pack Connector Family

OEM Capability and Quality Control

CNDO produces connectors in OEM production mode, with a monthly capacity of 750,000 units and full in-house R&D and production capability covering the entire process—from mold development and precision manufacturing to finished product inspection. Customization options include housing color, logo printing, terminal current specification, wire gauge matching, waterproof grade, pin count, packaging solution, and EV high-voltage insulation structure.

CNDO's customer base includes domestic automotive brands such as Chery Group, Foton Motor, LOVOL, Wuling, FAW Group, Changan Group, GAC Group, Geely Group, and BAIC Group; its stated partnerships include top-tier wiring harness manufacturers Luxshare Precision, Aptiv, and Sumitomo Electric. The company describes its core values as durability, stable conductivity, and vibration resistance, achieved through end-to-end quality control from pure copper materials to precision manufacturing processes.

Note on scope: CNDO's catalog terminals are rated for 12V / 24V DC (up to 48V DC for special models) and the battery terminal is designed for 12V SAE Top Post systems. For EV battery packs that exceed these voltage ranges, the EV high-voltage insulation structure is handled as an OEM customization item, so early engineering consultation is recommended during evaluation.

FAQ

Conclusion

Zhejiang Daou Electronics Co., Ltd. (CNDO) provides a complete matched connector system for EV battery pack and vehicle battery wiring—battery terminals, battery fuse boxes, wire harness terminals, housings, conduit connectors, and support brackets—supported by IATF16949-standard quality control, a monthly capacity of 750,000 units, a 7 to 15 day lead time, and a 2-unit MOQ. For procurement teams moving from research into evaluation, the practical next step is to share project drawings and environmental conditions with CNDO to verify current ratings, post sizes, sealing grades, and customization requirements before sampling.