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CNC Machined Copper Energy Storage Link for BESS and Power Distribution
Product Overview
An energy storage link serves as a copper bridge connecting battery modules to busbars, busbars to inverters, or inverters to grid connection points. These flat or L-shaped copper bars feature holes at each end for bolting to adjacent components. Engineered for demanding applications, they must carry 300A continuous current, withstand 500A short-circuit surges for 3 seconds without melting, survive 10 years of daily thermal cycling from 25°C to 65°C, and maintain cost-effectiveness at volume production.
The engineering precision lies in the cross-section calculation. For 300A continuous current in C11000 copper (101% IACS), a minimum cross-sectional area of approximately 70mm² is required to stay within temperature rise limits. We machine these critical components from C11000 ETP copper plate, maintaining dimensional consistency with length tolerances of ±0.1mm, hole position accuracy of ±0.1mm, and contact face flatness within 0.1mm to ensure consistent contact pressure and low resistance across all links in the rack.
Key Features
C11000 ETP Copper: 101% IACS minimum conductivity with virgin copper plate from certified mills, complete with material certificates
Precision Hole Positioning: ±0.1mm on bolt hole centers and ±0.05mm hole-to-hole distance for consistent bolt alignment
Contact Surface Finish: Ra 1.6 or better on bolt-contact faces for low contact resistance (<0.3 milliohm)
Plating Options: Tin plating (3-5μm) for general use, nickel plating (3-5μm) for harsh environments, silver plating (2-3μm) for maximum conductivity, with XRF verification
Custom Shapes: Straight links, L-links, Z-links, U-links and any 2D profile with maximum bending radius 3x material thickness
Technical Specifications
Specification
Details
Product Name
CNC Machined Copper Energy Storage Link
Material Options
C11000 ETP Copper, C10200 OFHC Copper
Tolerance
±0.1mm (length, width), ±0.05mm (hole-to-hole)
Surface Finish
Ra 1.6 (contact faces), Ra 3.2 (non-contact)
Current Rating
100A - 600A (cross-section dependent)
Cross-Section
30mm² - 200mm² (application dependent)
Plating Options
Tin (3-5μm), Nickel (3-5μm), Silver (2-3μm), Bare
Certifications
ISO 9001:2015, IATF 16949, RoHS, CE, REACH
Lead Time - Prototype
3-7 days
Lead Time - Production
7-15 days
MOQ
10 pieces (prototype), 100+ (production)
Origin
Dongguan, China
Applications
Battery Energy Storage Systems (BESS): Module-to-module links, rack-to-busbar links, battery string interconnects
EV Charging Infrastructure: DC bus links inside fast chargers, charging module interconnects, power distribution links
Solar Energy Systems: Inverter DC input links, combiner box bus links, battery bank interconnect cables
Material Preparation: Copper plate shearing or waterjet cutting with material certification verification
Bending (if required): CNC press brake bending with minimum 3x material thickness radius
CNC Machining: Profile milling, precision drilling, chamfering, and face milling
Deburring & Cleaning: Edge breaking and ultrasonic cleaning for plating preparation
Plating & Inspection: Plating application with XRF verification and comprehensive dimensional inspection
Frequently Asked Questions
What cross-section do I need for 300A?
For C11000 copper in BESS enclosures (max 60°C ambient, 30°C temperature rise), approximately 70mm² minimum cross-section is required for 300A continuous current. We calculate exact cross-sections during design review based on your specific current rating, duty cycle, and ambient temperature requirements.
Tin plating or bare copper?
Tin plating is recommended for most BESS applications as it prevents oxidation, provides consistent contact surfaces, and remains solderable for field repairs. Bare copper is suitable only for tightly bolted connections in sealed enclosures with immediate installation.
Can you make a link with both bolt holes and a threaded stud?
Yes, we can incorporate threaded holes (M6, M8, M10) on one end for stud connections while maintaining clearance holes on the opposite end for bolt-through connections, accommodating various BESS rack design requirements.
What's the lead time for 5,000 links?
10-15 days including plating. Copper plate availability, efficient machining processes, and established plating partnerships enable rapid turnaround, with straight links typically faster than bent configurations.
Do you provide contact resistance data?
Yes, upon request we perform 4-wire Kelvin contact resistance measurements on sample basis and include detailed data in inspection reports. Typical contact resistance ranges from 0.1-0.3 milliohm for properly installed tin-plated links.
Can you stamp these instead of machining?
Yes, for straight links in volumes above 5,000 pieces, stamping offers cost efficiency with ±0.2mm tolerance. We recommend the most appropriate manufacturing method based on your volume, tolerance requirements, and economic considerations.
