As a part of the battery management system BMS, CCS integrated busbar replaces the traditional copper wire harness scheme with FPC scheme, which has been rapidly promoted by new energy power and energy storage battery factories in recent years.
CCS integrated busbar with FPC as the signal acquisition component solves the pain points of the traditional sampling wiring harness and busbar layout, large space occupation, low degree of automation, and has the advantages of lightweight, high security, high maintainability, flexible design, and high automation, which is conducive to improving the internal space utilization and assembly efficiency of battery packs, and is suitable for large-scale production. Therefore, it is widely used in the field of new energy vehicle batteries and energy storage.
As a key component of CCS integrated busbar signal acquisition and transmission, Flexible Printed Circuit board (FPC) is a printed circuit board made of flexible copper clad plate (FCCL) as the substrate, and the cost of flexible copper clad plate (FCCL) accounts for 40%-50% in FPC processing Annealed steel strip.
Flexible copper clad plate (FCCL) is mainly composed of copper foil, polyimide or polyester film and adhesive, among which, copper foil has good electrical conductivity and processability, can provide the conductive path required by the circuit board, and can also interconnect components.
Copper Foil has a variety of classification methods, according to the production process can be divided into electrolytic Posited Copper/ ED and Rolled Copper Foil/ RA two categories, and these two types of copper foil can be used for FPC processing, performance as shown in the figure below. You can make the selection based on the requirements of specific application scenarios.
Rolled copper foil is a product made by repeated rolling and annealing of high-precision copper strips (thickness is usually less than 150 microns) using the principle of plastic processing (thickness is usually between 4-100 microns, width is usually < 800 mm), its crystal form is sheet-like structure, compared with electrolytic copper foil, has better ductility, bending resistance and electrical conductivity, and higher strength. Copper purity is also higher than electrolytic copper foil Carbon steel Coil Cutting Rule.
However, the thinness and width of the rolled copper foil will be limited by the size of the roll, and the requirements for equipment are high, the process is complex, and the production cost is high. At present, the global rolled copper foil production capacity is mainly concentrated in the hands of American and Japanese companies, such as Japan's Nikko Metal, Fukuda Metal and other companies occupy more than 80% of the global market share Flat Steel For Chain.