成果報告書詳細
管理番号20110000001079
タイトル*平成22年度中間年報 新エネルギーベンチャー技術革新事業/新エネルギーベンチャー技術革新事業(太陽光発電)/球状Si太陽電池(スフェラー(R))を組み込んだ織物を製造する技術の開発
公開日2011/6/29
報告書年度2010 - 2010
委託先名京セミ株式会社
プロジェクト番号P10020
部署名技術開発推進部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 概要:球状Si太陽電池(以下スフェラー(R))が持つ特長を背景に、織物技術から発想した誰もが使える柔軟性のあるしなやかな布のような太陽電池(形状の自在性がありしなやかで、直接光を含む、反射光や散乱光も効率よく取り込む新しい形態の太陽電池を活用した製品)実現の技術開発を行う。
研究開発項目(1)「スフェラー(R)Mesh基本構造用の織物繊維に関する研究開発」(目標値:1万回曲げ試験で出力90%以上維持、発電量10%アップ、スフェラー(R)との接続材料は導電性ペーストを使用する為、耐熱温度200℃以上の耐熱性導電性繊維を選定する)。
英文要約The objective of this project is to develop very unique solar modules inspired by textile technology. In the modules, Sphelar cells, which can capture sunlight from all the directions, are integrated into pieces of texture and the texture is laminated with transparent resin, such as ethylene-vinyl acetate (EVA) or polyvinyl butyral (PVB). The main features are that they are very flexible and less dependent on vertically falling light, which allows for entirely new applications. Sphelar cells could be integrated into bags, backpacks, or even pieces of clothing to charge batteries and small electronics,
This year, we determined the basic structure and materials of the texture composed of warp and woof. Very unique warp is designed in collaboration with the Industrial Technology Center of Fukui Prefecture. The warp is conductive wire which uses aramid fiber as a core and is helically wrapped with thin copper filament. The aramid fiber has resistance to fatigue and high temperatures up to 500 degrees centigrade. The structure and the materials create flexibility and durability. The very low electrical resistivity is also secured.
Meshes of Sphelar cells connected by ca. 0.1-mm thick Tin- coated Copper wire (warp) have been already used in a wide range of Sphelar products. But, it is fragile and requires careful handling. Researchers from the Industrial Technology Center of Fukui Prefecture and Professor Matsushige at Kyoto University advised that the structure should be reinforced with woof. We took glass fiber because it is not expensive and can transmit and reflect light. A texture (mesh of cells) where the Copper wire was swapped for the newly-devised conductive wire (warp) and manually interweaved with glass fiber later (woof) was prototyped. The maximum power obtained from the texture was compared with that of the one without the woof and 10 % gain was observed. It is probably due to that the light reflected from the glass fibers was also used to generate electricity.
Next, the structure is laminated with EVA (PCB) and a bending cyclic fatigue test was done by using a Scott-type crease-flex abrasion tester. Preliminary data was promising. The observed maximum power deterioration was well below 10% even after 10k cycles.
Finally, we study the feasibility of automated equipments and facilities for the module manufacturing. We enter into a nondisclosure agreement with several companies who have a large expertise in process automation for various technologies and disclose some of the confidential information we gained over the years about manufacturing process. Some ideas are already presented. One is to prepare a texture in advance and implement each cell onto it later. But, unfortunately, we have not yet obtained a gratifying result. So, we will add a new twist to it.
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