The invention relates to a heat
radiation backboard for a photovoltaic
assembly. The backboard is composed of a
metal heat conduction layer, an insulated bonding layer at one side of the
metal heat conduction layer and a weather resistant layer at the other side of the
metal heat conduction layer, wherein the insulated bonding layer is added with an alkali-free
glass fiber powder filling material, the thickness of the bonding layer is 20-50
micrometer, the thickness of the metal heat conduction layer is 50-200
micrometer, and the thickness of the weather resistant
coating layer is 8-20
micrometer. Addition of alkali-free
glass fiber powder enables high electrical insulation performance of the bonding layer, and when the bonding layer is combined with the metal layer, requirements for insulation performance of the backboard material can be satisfied, and the problem that a traditional resin backboard is low in heat
radiation performance is sovled. Compared with a present metal backboard, a
common method, in which an insulated high
molecular film layer is pasted, is replaced, and the interface
thermal resistance is effectively reduced. Compared with the prior art, the whole temperature of the
assembly is effectively reduced, and the power generating efficiency of the
assembly is improved.