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what is double-sided, shingled, half-chip and MBB multi-busbar solar panels modules


The solar photovoltaic module is the core part of the solar power generation system, and its function is to convert solar energy into electrical energy and send it to the storage battery for storage. According to the components, the commonly used crystalline silicon photovoltaic modules are mainly composed of three parts: cell, EVA packaging material, glass, backplane and frame, and junction box.

Solar panels:

It is the core component of solar power generation. According to the photovoltaic effect, it can form free electrons under the condition of light, and create a current under the unidirectional conduction of the PN junction, thereby converting solar energy into electricity. At present, the developing technologies of solar cells include aluminum backfield (Al-BSF), passivated emitter and backfield (PERC), heterojunction (HIT), and so on.

EVA encapsulation material: The thermosetting adhesive film containing EVA is used for laminating the cell, backplane, and glass into a whole to form a module.

Glass, backplane, and frame: Parts that prevent the cells from being corrupted or damaged by the outside world, extend the service life of the modules, and facilitate subsequent installation.

Junction box: Generally, there are 60 or 72 cells in the module. The cells are connected in series through the silver paste. After the current is formed under light conditions, it is transmitted to the junction box through the silver paste wire, and then connected to the external battery.

Solar PV module internal structure:

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The half-cell technology is a typical technology that increases power proportionally, and it superimposes a higher-efficiency cell to bring greater improvement. Half-chip technology superimposed on conventional polycrystalline modules can increase the power by 5~6W; the same technology can be superimposed on monocrystalline perc modules to bring more than an 8W power increase. In 2018, full-chip modules accounted for more than 90% of the share. The half-chip technology reduces the series resistance in the module, reduces internal power loss, and improves conversion efficiency. The half-chip technology is mature and the yield is guaranteed. The current production capacity is about 15GW, and it is expected to gradually replace the full chip in the future.

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Shingling capacity and forecast in 2017-2021 (GW)

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The so-called shingling technology refers to cutting the traditional battery slices into 1/5, using conductive glue to directly connect the two batteries, bonding and stacking them together, and then connecting the battery slices in series on this basis. In this way, the 2-3 mm cell spacing reserved in traditional modules can be eliminated, and more cells can be loaded in the same area. Generally speaking, a conventional 60-type module can load 66 cells.

In addition, since the shingled technology uses conductive adhesive instead of the welding tape for current transmission, there is no problem with the welding tape covering the effective light-receiving area in the traditional module, so the effective light-receiving area of the shingled module is larger than that of the traditional module, which further improves the stacking performance. The conversion efficiency of tile components. Shingling technology is an important technological innovation of photovoltaic module technology. Shingling has changed the long-term method of using welding tape to electrically connect cells, greatly increasing the light area of photovoltaic modules. The production capacity of shingled modules has also increased significantly since this year, but due to the long-term concerns of patent infringement in shingled technology, the end market is relatively limited. For overseas exports, the shingled modules of most manufacturers are still mainly supplied to domestic projects in China.

From the perspective of the process flow of shingled components, the first difficulty lies in the problems such as cracks and damages that may be caused during the slicing process; the second is that in the welding process, it is necessary to use a special stringer for shingling. Require. In general, the processes that affect the yield of shingled components include laser cutting, battery strip arrangement, battery strip welding, etc. In addition, other processes and equipment requirements are basically the same as those of conventional components.

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