Summary
The Fraunhofer Institute for Solar Energy Systems (ISE) in Germany and Comax have jointly developed and developed a breakthrough technology for the connection of a high-efficiency MWT cell. This innovative technology has obvious cost advantages and very low losses.
Foreword
In the current intense competition in the solar energy industry, PV module manufacturers are striving to differentiate their products. The main direction is to achieve the highest module efficiency at the lowest cost. At present, although there are numerous technical concepts and marketing programs that claim to have mature products, most of the products cannot withstand meticulous research. There are too many examples to prove that some of the technological advantages achieved in one area do not necessarily translate into the final benefits of the component. For example, although the cost of the cell sheet is reduced, the final component cost is not reduced as a result; for another example, the efficiency of the cell sheet may be improved, but the final module efficiency is not improved to the same extent.
The difference between being in contact with the battery and the back in contact with the battery
Carefully study the various technical concepts that are touching the cells and components, you will see the natural defects of this technology. There is a dilemma in the process of connecting the cells to the assembly: in order to reduce the loss of the cell to the module (CTM), the total cross-sectional area of ​​the ribbon or connecting wires must be increased, however, in order to reduce the front of the cell The shadow caused by the ribbon, the cross-sectional area must be reduced as much as possible. The use of multiple strands of connecting wires instead of ribbons alleviates this problem to some extent, but it does not solve the problem effectively. Whether it's BSF, PERC, HIT, or other positive contact batteries, no battery of this type can escape this dilemma. Only the back contact battery can use a large cross-sectional cell connection without any shadow on the front side at the same time.
Because of this, in order to further enhance the efficiency of the cells and components, whether it is IBC, EWT, or MWT, the back-contact battery technology is undoubtedly more attractive than the positive-contact battery. These technologies are suitable for cell connection: Because of the large cross-sectional cell interconnections, CTM losses are low and there is no positive shadow. Although conductive backplanes provide the conditions for large cross-sectional cell connections, the industry has been looking for a low-cost way to achieve the same low CTM loss rate.
A new connection
Comax developed a new interconnection method with the Fraunhofer Institute for Solar Energy Systems called the HIP component (or high-efficiency component) technology. This method uses ribbons, as well as an innovative battery interconnect method. The CTM losses it can achieve and the power of the components have been confirmed by independent certification bodies.
There are several key advantages of HIP component technology over other connection technologies. First, the cost of materials and equipment is low, and CTM losses may be below 1%. At the SNEC 2013 in Shanghai, Comax (Booth No. E3-520) will exhibit the standard 60 solar modules manufactured using this new connection technology. At the show, Comax and the Phil Wolfhof Institute for Solar Energy Systems will demonstrate the obvious cost-per-watt advantage of this new technology.
Second, the production of this high-performance MWT cell and HIP module can be carried out on existing production lines as well as on new production lines. Technology, equipment and raw materials are all available. Compared with other new technologies, Komax's innovative solutions require little change in the existing production processes and require little additional cost. This allows component manufacturers to quickly convert products to produce more efficient components, which is the key to leading component companies to win.
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