Method of interconnecting shingled PV cells
A technique for interconnecting PV cells using partial overlapping method is disclosed with at least one part of the PV cell is applied with a non-conductive bonding material. Another PV cell is then placed above this PV cell in a partial overlapping manner and depending on the type of bonding material used, the necessary curing step is performed. The disclosed method can be used to interconnect 1) PV cells; 2) shingled PV strings; 3) PV cell and other components to external circuitry, within a shingled PV module. The interconnecting method also improves the aestheticism, reliability, and manufacturability of shingled PV modules that are constructed with shingled PV cells.
1. A PV string comprising a first and second PV cells, each PV cell having a busbar, wherein the first and second PV cells are electrically connected to each other using non-conductive bonding material, characterised in that the first and second PV cells are interconnected in a partial overlapping manner, and the non-conductive bonding material is within the overlapping regions of the first and second PV cells, and forms a direct connection between the busbar of the first and the busbar of the second PV cells and without the use of conductive bonding material.
2. A method of electrically connecting and constructing the PV string according to claim 1 , comprising the steps of:
Step 1: applying the non-conductive bonding material on a surface of the first and/or the second PV cell, wherein the non-conductive bonding material is applied along a region adjacent to a front busbar edge of the first PV cell and/or along a region adjacent to a rear busbar edge of the second PV cell;
Step 2: placing the second PV cell in a partially overlapping manner, such that the busbars of both the first and second PV cells are aligned with each other, and the non-conductive bonding material is within the overlapping region of the first and second PV cells, characterized in that a mechanical connection is established by direct contact of the non-conductive bonding material to the first and second PV cell such that an electrical contact between the first and second PV cells is established;
Step 3: curing the PV string.
3. The method according to claim 2 , wherein the non-conductive bonding material is applied in a continuous or non-continuous manner.
4. The method according to claim 3 , wherein the non-conductive bonding material is applied using a means selected from a group consisting of a syringe, a spray nozzle, a stencil or a pick and place process step.