The structure
of double-glass photovoltaic
panels:
Glass cover,
packaging materials, solar cells, glass back, frame, junction
box
According to
the structure, the double-glass photovoltaic panel has glass on
both the top and bottom, so there are several main issues to
consider when doing fire resistance
testing
Glass
breakage problem:
The two
pieces of glass in the double-glass photovoltaic panel are easy to
break under the action of high-temperature flames. The thermal
expansion coefficient of glass is different from that of the
internal battery cells and packaging materials. When heated,
internal stress will be generated due to the inconsistent expansion
of each material. When this stress exceeds the bearing limit of the
glass, the glass will break. For example, during the rapid rise of
flame temperature, the glass may crack due to rapid thermal
expansion. Once the glass breaks, the flame is more likely to
contact the internal battery cells and packaging materials,
changing the spread path and speed of the fire, and increasing the
uncertainty of the test results.
The entire
photovoltaic panel is bent due to
heat:
Solar cells
may experience thermal runaway in high temperature environments.
When the temperature of the cell is too high, its internal
electrical properties will change, causing the overall structure to
bend.
EN ******2
Fire resistance test Standard
name:
EN ******2Fire classification of
construction products and building elements-Part 2: Classification
using data from fire resistance tests, excluding ventilation
services
EN ******2
Fire resistance test Product
scope:
Load-bearing
elements without fire separation function: walls, floors, roofs,
beams, columns, stairs,
Load-bearing
elements with fire separation function: walls, floors, roofs,
raised floors
Non-load-bearing components or engineering
parts: partitions, facades (curtain walls) and external walls, fire
doors and shutters, smoke doors,
Conveyor
systems and their closures, penetration seals, linear joint seals,
service ducts and shafts, chimneys
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