Heterogeneous photovoltaic welding strip and machining method thereof

Abstract

The invention discloses a heterogeneous photovoltaic welding strip comprising a conductive baseband. The conductive baseband has a lower joint surface and an upper reflective surface. The lower joint surface is a smooth surface. V-shaped grooves are distributed on the upper reflective surface, and a coupling platform is formed between every two adjacent V-shaped grooves. The heterogeneous photovoltaic welding strip is characterized in that the V-shaped grooves extend in parallel along the length direction of the conductive baseband, the depth of the V-shaped grooves is 25-30% of the thickness of the conductive baseband, and the included angle of the V-shaped grooves is 77-95 degrees. The scheme provides a photovoltaic welding strip which has high incident light utilization rate and more outstanding toughness and tensile strength. The invention further discloses a machining method of the heterogeneous photovoltaic welding strip.

Description

technical field [0001] The invention relates to a heterogeneous photovoltaic ribbon and a processing method thereof, belonging to the technical field of solar energy. Background technique [0002] Photovoltaic ribbon is the key auxiliary material for connecting solar cells into strings. Solar cells are connected by ribbons to form a complete electrical path. Light energy is converted into electrical energy through solar cells, and the generated current forms a transmission circuit through ribbons, which provides Access basis. The base material of ordinary solder ribbon is copper, and the surface of the solder ribbon base material is coated with a tin layer. The entire ribbon surface is relatively flat. Although there are some special-shaped ribbons on the market at present, there are various regular grooves on the surface to achieve secondary reflection to reach the surface of the cell and be reused, thereby improving the utilization rate of incident light. [0003] For ex...

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Problems solved by technology

[0004] However, since the strip-shaped groove and the conductive base strip in the above application are arranged obliquely, it is easy to break when the welding ribbon is bent or rolled up. This is because the oblique setting of the groove makes the bending strength and tensile strength of the welding ribbon Both are caused by a serious drop. If the breakage occurs after the battery is assembled, the transmission circuit will be easily disconnected and the light energy conversion will not be realized.

Moreover, in the prior art, the depth and included angle of the groove are too large, and the groove is too deep, which will easily cause the thickness of the solder ribbon envelope to be too large, which will increase the risk of weather resistance safety of the module and the risk of battery fragments during the lamination process of the module. If it is too shallow, the reflective function cannot be fully utilized to achieve efficient light utilization.

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