Building material type (BIPV) battery module is to integrate the battery module into the building material, or closely integrate it with the building material. The battery module is used as a part of the building material. It can be installed at one time in the process of building a new building or rebuilding it. That is, the building construction and the installation and construction of the battery modules can be completed at the same time. Building material type battery modules have good durability and light transmittance, meet architectural requirements, can be perfectly combined with buildings, and can be widely used in building light-transmitting roofs, building photovoltaic curtain walls, building guardrails, rain shelters, agricultural photovoltaic greenhouses, bus stations, sun rooms and other facilities.
Common building materials type battery modules include double glass battery modules and hollow glass battery modules. Their common feature is that they can be used directly as building materials, such as windows, glass curtain walls, glass roof materials, etc., which can both daylight and generate electricity. In the design, by adjusting the gap between the cell and the cell on the module, the light transmittance of the module can be determined, and the amount of lighting required in the room can be achieved.
1. Double glass battery module
The double-glass cell module is formed by sandwiching the cell sheet between two layers of glass and laminating and curing EVA or PVB adhesive film. The light-receiving surface of the module is made of low-iron super-white tempered glass, and the back is generally made of ordinary tempered glass. The appearance is shown in Figure 1.
When used as window glass, the glass thickness can be 3.2mm×3.2mm; when used as a glass curtain wall, according to the size of the single glass, the glass combination thickness is 3.2mm×4mm, 4mm×6mm, 6mm×6mm, etc.; when used as a glass roof, it is also necessary to choose the combined thickness of the glass to be 4mm×6mm, 6mm×6mm, 6mm×8mm, etc. according to the size of the single glass; the larger the size, the thicker the combined thickness to ensure the mechanical strength of the modules. The structure of the double glass battery module is shown in Figure 2.
The application of double glass cell modules in photovoltaic roofs is shown in Figure 3. Figure 4 is a schematic diagram of the structure of a double glass cell module applied to a photovoltaic roof.
2. Hollow glass battery module
In addition to the functions of daylighting and power generation, the hollow glass cell module also has the functions of sound insulation, heat insulation and heat preservation. It is commonly used in the glass curtain wall cell module of various photovoltaic building integrated power generation systems. Its appearance is shown in Figure 5. The hollow glass battery module is constructed on the basis of the double glass battery module and combined with a piece of glass. Separate the module and the glass with a hollow aluminum spacer with a desiccant inside, and seal it with butyl glue, structural glue, etc. The junction box, the positive and negative leads, etc. are also sealed in the edge sandwich of the front and rear glass with sealant to form an integral body with the modules, making the installation of the modules and the wiring connection between the modules very convenient. The hollow glass battery module is the same as the common hollow glass that is widely used at present, and it can meet the requirements of building safety glass. The structure of the hollow glass battery module is shown in Figure 6. The application of hollow glass cell modules in photovoltaic curtain walls is shown in Figure 7.
Read more: What are the new types of battery module?