For Better Connection Solutions in Energy Storage Systems
Against the background that energy storage systems are evolving toward higher power density and higher reliability, the heat dissipation and current‑carrying capacity of connecting cables have become core factors restricting system efficiency and safety.
Due to low heat dissipation efficiency and limited current density, traditional round cables can no longer meet the stringent requirements of energy transmission in energy storage systems.
With its unique structural design, flat busbars demonstrate outstanding advantages in heat dissipation and current‑carrying capacity, making them an innovative solution in the field of energy storage connections.
Combining technical principles and practical applications, this paper deeply discusses the heat dissipation mechanism and current‑carrying characteristics of flat busbars, and introduces Shenyangming Electronics – a benchmark enterprise in the industrial connection industry – to show how its innovative products empower the upgrading of energy storage systems.
I. Heat Dissipation Performance of Flat Busbars:
Structural Optimization Drives Thermal Management Innovation
The heat dissipation advantages of flat busbars come from the dual optimization of physical structure and material technology.
Compared with traditional round cables, flat busbars achieve efficient thermal management through the following mechanisms:
1. Maximized Surface Area Design
Flat busbars adopt a flattened structure. Under the same cross‑sectional area, their surface area is about 30% higher than that of round cables.
Taking a 100 mm × 10 mm flat busbar as an example, its heat dissipation area is 1.8 times that of a round cable with a diameter of 11.28 mm.
A larger surface area directly enhances air convection efficiency, and vertical installation can further improve heat dissipation.
Experimental data shows that at an ambient temperature of 40℃, the temperature rise of flat busbars is more than 10℃ lower than that of round cables, effectively delaying material aging.
2. Improved Material Purity and Processing Technology
High‑purity oxygen‑free copper (OFC) is the core material of flat busbars. Its conductivity is 5% higher than that of ordinary copper, and the resistivity is reduced to 0.0172 Ω·mm²/m.
Through vacuum melting technology, Shenyangming Electronics controls the copper purity above 99.95%, and uses laser welding technology to ensure the contact resistance between conductors and terminals is below 0.1 mΩ.
This combination of materials and processes reduces the Joule heat generated by flat busbars during continuous current carrying by 20%, significantly improving thermal stability.
3. Innovative Heat Dissipation Structure
Shenyangming Electronics introduces a “double‑layer heat dissipation channel” in the design of flat busbars:
the inner layer uses high thermal conductivity silica gel to fill conductor gaps, and the outer layer is wrapped with an aluminum foil shielding layer.
This structure not only reduces thermal resistance to 0.5℃/W, but also reduces thermal radiation loss through infrared reflection by the aluminum foil.
In energy storage battery module connections, this design controls the temperature difference between modules within 2℃, avoiding capacity attenuation caused by local overheating.
II. Current‑Carrying Capacity of Flat Busbars:
Collaborative Optimization of Structure and Environment
Current‑carrying capacity is a core indicator for measuring cable performance.
Flat busbars break through the traditional current‑carrying limit through the following technical approaches:
1. Improved Slot Fill Factor and Optimized Current Density
The slot fill factor of flat busbars can reach more than 70%, 40% higher than that of round cables.
A higher slot fill factor means more conductors can be accommodated per unit volume, thereby improving current carrying capacity.
Taking Shenyangming Electronics’ 120 mm × 8 mm flat busbar as an example, it can safely carry 3000 A current at 25℃ ambient temperature, with a current density of 31.25 A/mm², 1.6 times that of round cables.
2. Environmentally Adaptive Design
For the outdoor high‑temperature environments often faced by energy storage systems, Shenyangming Electronics has developed “weather‑resistant flat busbars”:
the conductor surface is tin‑plated, improving oxidation resistance by 3 times;
the sheath is made of FEP (fluoroplastic), expanding the temperature resistance range to -65℃ ~ 200℃.
At 40℃ ambient temperature, the current‑carrying capacity of this product only decreases by 8%, far better than the industry average attenuation rate of 15%.
3. Optimized Installation Method and Spacing
The heat dissipation performance of flat busbars is closely related to the installation method.
Through fluid dynamics simulation, Shenyangming Electronics has determined the optimal installation parameters:
when installed vertically, the conductor spacing needs to be ≥5 mm to ensure air circulation;
when installed horizontally, a wave‑shaped heat sink design is adopted to increase the surface area by 25%.
In practical applications, these designs increase the current‑carrying capacity of flat busbars in dense wiring scenarios by 12%.
III. Shenyangming Electronics:
An Innovation Leader in the Industrial Connection Industry
As a benchmark enterprise in the field of industrial connection cables,
Shenyangming Electronics provides full‑scene connection solutions for energy storage systems with its technical accumulation and product portfolio.
1. Core Technical Advantages
- Material Science: Cooperates with Tongling Nonferrous Metals to develop high‑purity copper with conductivity up to 103% IACS;
- Precision Manufacturing: Introduces German Komax automatic crimping machines, with crimping accuracy controlled at ±0.05 mm;
- Environmental Simulation: Equipped with a temperature‑humidity cycle test chamber ranging from -40℃ to 85℃; products pass UL94 V‑0 flame retardant certification.
2. Product Line Layout
- Industrial Connection Cables: Cover products with a pitch of 2.54 mm ~ 10 mm, supporting 10 A ~ 50 A current transmission;
- Terminal Wires: Adopt double crimping technology with tensile strength up to 50 N, suitable for vibration environments;
- Encoder Connection Cables: Support A/B/Z incremental signal transmission, with shielding effectiveness ≥80 dB;
- Servo Connection Cables: Integrate power and encoder dual channels, with transmission delay <1 μs.
3. Customized Service Capability
Shenyangming Electronics provides a full‑chain customized service of “material‑structure‑process” for energy storage systems.
For example, for a photovoltaic energy storage project, it developed a “salt‑spray resistant flat busbar”:
the conductor adopts a nickel plating layer, and the sheath is added with anti‑UV additives, extending the service life to 15 years in high‑humidity coastal environments.
Conclusion
With dual advantages in heat dissipation performance and current‑carrying capacity, flat busbars are becoming the preferred solution in the field of energy storage system connections.
Through material innovation, process upgrading and customized services, Shenyangming Electronics provides the industry with a full‑link solution from products to systems.
In the future, with continuous technological breakthroughs, flat busbars will play a key role in building a safe, efficient and sustainable energy storage ecosystem