Laminate Bus Bar: Invisible High-Speed ​​Channel of Power Electronics System

In the new energy revolution and industrial digitalization, laminate bus bar, as the core connector of power electronic system, is reshaping the efficiency and reliability of energy transmission with its unique multi-layer composite structure. This component, known as "distribution highway", has become a key infrastructure in the fields of new energy vehicles, energy storage, rail transit, etc. through its low stray inductance, high current carrying capacity, compact design and other characteristics.

 

 

The core advantage of Laminated Copper BusBar comes from its modular design: the sandwich structure composed of copper/aluminum conductor layer, insulation layer and shielding layer reduces stray inductance by more than 70% compared with traditional wiring harness, effectively suppresses voltage spikes during IGBT/MOSFET switching, and prolongs device life. Taking new energy vehicles as an example, the battery pack of a mainstream model uses copper-aluminum composite laminated bus bar, which reduces the energy loss from battery pack to motor by 12%, while reducing the volume by 40%, meeting the lightweight requirements of electric vehicles.

 

Continuous breakthroughs in process innovation: Industry manufacturers use powder spray coating technology to improve the insulation protection level of busbar surface to IP67 to adapt to the vibration environment of rail transit; the edge sealing process solves the insulation aging problem of traditional glue-filled busbars at high temperatures, extending the Laminated Flexible BusBar life to more than 10 years.

 

According to third-party tests, the Laminated BusBar for Mersen designed with digital simulation can shorten the customized development cycle from 4 weeks to 72 hours, significantly improving the response speed of new energy customers.

 

 

 

1. New energy vehicles: the "nerve hub" of batteries and electric drives
Under the background of the popularization of 800V high-voltage platforms, Laminated Busbar Connectors undertakes the dual tasks of internal connection of battery packs and power distribution of motor controllers. The measured data of a leading OEM shows that the integrated laminated busbar increases the energy density of the battery pack by 5%, and at the same time meets the safety requirements of extreme working conditions such as puncture and collision through redundant design. In 2024, the domestic laminated busbar market for new energy vehicles will account for 45%, becoming the core engine of industry growth.

 

2. Energy storage and photovoltaics: an efficient and stable "energy bridge"
In the energy storage converter (PCS), the low impedance characteristics of the BusBar for Power Electronics reduce heat loss by about 8%, and with the liquid cooling structure design, the overall efficiency of the containerized energy storage system exceeds 98%. In response to the high-frequency switching requirements of photovoltaic inverters, the aluminum-based laminated busbar has a penetration rate of over 60% in the field of distributed photovoltaics due to its cost advantage (30% lower than copper busbars), which is especially suitable for compact spaces for household energy storage.

 

3. Railway transportation: a "reliable partner" in harsh environments
The subway traction system has extremely high requirements for busbar vibration resistance and corrosion resistance. A subway project uses an edge-enclosed Laminated Bus Bar Design, which has passed the salt spray test for 1,000 hours without failure, and with modular design, reduces maintenance costs by 60%. Data shows that the demand for laminated busbars in the rail transportation field will increase by 22% year-on-year in 2023, becoming the second largest application scenario after new energy.

 

 

 

Despite the broad prospects, the Laminated Bus Bar for Router Backplane Distribution industry still faces dual challenges: on the one hand, the price fluctuations of copper and aluminum raw materials have compressed profit margins, forcing companies to turn to copper-aluminum composites, ultra-thin conductors (below 0.1mm) and other material innovations; on the other hand, the surge in customized demand has led to a mismatch in production capacity of small and medium-sized manufacturers. Leading companies have achieved "small batch fast delivery" through digital factories, such as the AI ​​scheduling system of a manufacturer in East China, which has increased order response speed by 50%.

 

1. Material innovation: The popularity of silicon carbide (SiC) devices promotes the evolution of Automotive BusBar to "high frequency and low inductance". Graphene composite coating technology is being verified in the laboratory, aiming to reduce the inductance to below 1nH.

2. Digital design: AI algorithms have been applied to busbar electromagnetic field simulation. The "busbar design brain" developed by a university and an enterprise can automatically optimize the 3D structure and reduce the trial and error cost by 90%.

3. Emerging scenarios: In the fields of hydrogen fuel cells and ship electric propulsion, the corrosion resistance and high pressure resistance of Laminated Bus Bar for Compact IGBT DC Power open up new markets. In 2024, hydrogen-related orders increased by 170% year-on-year.

 

 

The value of Laminated Inverter Busbars lies not only in connecting electricity, but also in reconstructing system efficiency. As the installed capacity of new energy exceeds 500GW (2024 data), this "invisible component" is moving from behind the scenes to the front. Industry participants need to focus on the dual-wheel drive of "customization + digitalization" and build a moat with material innovation, process upgrades, and scenario penetration - after all, in the arena of power electronics, every 1% loss reduction is the key to winning the market.