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The laminated bus bar is also called composite bus bar, laminated bus bar, laminated bus bar and composite copper bar. It is a multi-layer composite structure connecting row, which can be regarded as the expressway of distribution system. Compared with traditional, bulky, time-consuming and troublesome distribution methods, the use of composite busbar can provide modern, easy to design, fast installation and clear structure distribution system.

The conductor material of the stacked master row is usually made of T2 copper or 1060 aluminium plate. The main insulating material of laminated bus is usually PET, which has the best cost performance. Other materials may be used if there are special requirements. FR-4 board and GPO-3 board are used as auxiliary insulation materials. The stacked bus is generally used in high-power power cabinet and various high-power converter devices. Generally, copper or aluminium plates are used as conductors, and MYLAR insulating film is used to isolate and insulate conductors. Conductors can combine some fasteners, connectors, cables to achieve the current transfer between the main circuit and branches, as well as between high-power components. Compared with traditional, bulky, time-consuming and troublesome methods of discrete buses and cables, the use of stacked buses can provide modern, easy-to-design, fast-to-install and well-structured distribution systems. The stacked bus is equipped with low-distributed electric vehicles, traction equipment for rail transit, frequency converters, inverters, active filter devices, reactive power compensation devices, large-scale network equipment, large and medium-sized computers, power switch systems, welding systems, military equipment systems, etc.


Application of laminated bus in new energy automobile industry
Working Principle of New Energy Vehicle
The stacked mother row has many advantages.
Firstly, it has very low production cost and high security and reliability; secondly, because of compact design, it can save a lot of space; thirdly, the inductance and impedance of the stacked bus are relatively low; fourthly, its convenient installation greatly reduces the probability of incorrect installation; finally, compared with traditional cables, it has better current carrying capacity and higher temperature. It's very slow.
1. Advantages over traditional mother row
Generally, the main circuit can not change its switching devices and DC parasitic capacitance, and reducing the distributed inductance of the main circuit bus is the fundamental measure to suppress the switching voltage spike. There are four main ways of electrical connection between switching devices and DC side supporting capacitors:
(1) Parallel arrangement of copper plates or strips. Its fabrication method is simple and easy to realize. It can suppress voltage spikes to a certain extent, but there is still a great mutual inductance. Therefore, it is mainly suitable for places with high power but low performance requirements.
(2) Cable strands. Its use is relatively convenient and cheap, but it has great self-inductance and mutual inductance, poor performance, and insufficient carrying capacity. Therefore, it is suitable for places with low power and low performance requirements.
(3) Coaxial cable. Its main characteristics are low mutual inductance of coaxial cable and easy to use, but it also has the shortcomings of high cost and low current carrying capacity, which is suitable for low power occasions with general performance requirements.
(4) Laminated mother row. Its main structure is to stack two or more copper master bars, insulate each copper master bars with insulating materials, and then make the conductive layer and insulating layer as a whole through some processes. This makes it have a flat cross-section, which enlarges the conductive layer area under the same current cross-section, greatly increases the heat dissipation surface, and increases the carrying capacity. At the same time, it also reduces the distance between conductive layers, because the current flowing through the adjacent conductive layers is in the opposite direction, resulting in a mutually cancelled magnetic field, which greatly reduces the distributed inductance in the line.

By using the stacked master row, we can find thatit has many advantages, but compared with the common copper bar, some problems must be considered in the actual design of the stacked master row. Compared with other types of mother row, the production cost of laminated mother row is slightly higher. In addition, it is extremely inconvenient to change the structure of the copper bar after using the laminated master row. Because the die must be opened in the process of manufacturing the laminated master row, if the structure of the copper bar is changed, the die must be changed. If there are more requirements for the change of the plan, it is necessary to re-open the mould. Therefore, it is necessary to complete the design plan of copper bars, and it is suggested that the correct sample stage and the structure of copper bars should be determined before the processing of laminated master bars.

Shenzhen Tianjie Machinery and Electricity Co., Ltd. specializes in producing laminated mother row.