JP-2026075892-A - Lifetime power generation panels

Abstract

[Problem] To provide a solar power generation panel that can reduce thermal stress in solar power generation elements. [Solution] The solar power generation panel 1 is provided with a stress relief layer 6 located near the solar power generation element 2 to relieve thermal stress on the solar power generation element 2. The stress relief layer 6 comprises a thin plate-shaped main body member 61 having a plurality of through-holes 63 having a predetermined pattern, and a strip-shaped connecting member 62 that is larger than the thermal expansion coefficient of the main body member 61 and is provided on some of the plurality of 63, and crosses the through-holes 63 to connect the main body member 61 that is divided by the through-holes 63. The stress relief layer 6 is configured to contract overall when heated by utilizing the difference in the amount of thermal expansion of the main body member 61 and the connecting member 62, and to expand overall when cooled by utilizing the difference in the amount of thermal contraction of the main body member 61 and the connecting member 62. [Selection Diagram] Figure 1

Inventors

• 橋本 広幸

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (4)

1. Photovoltaic power generation element, A stress relaxation layer provided near the photovoltaic element to relieve thermal stress on the photovoltaic element, A sealing layer that seals the photovoltaic element and the stress relaxation layer, Equipped with, The stress-relieving layer comprises a thin plate-shaped main body member having a plurality of perforations having a predetermined pattern, and a strip-shaped connecting member that is larger than the thermal expansion coefficient of the main body member and is provided in some of the plurality of perforations, connecting the main body members separated by the perforations and traversing the perforations. The stress-relieving layer is configured to contract overall when heated by utilizing the difference in the amount of thermal expansion of the main body member and the connecting member, and to expand overall when cooled by utilizing the difference in the amount of thermal contraction of the main body member and the connecting member. A solar power generation panel characterized in that, when the thickness of the main body member is ta, the elastic modulus of the main body member is Ea, the thickness of the connecting member is tb, and the elastic modulus of the connecting member is Eb, the main body member and the connecting member satisfy the relationship 0.1 < (Eb × tb) / (Ea × ta) < 1.0.
2. The connecting member comprises a first connecting member and a second connecting member. The photovoltaic panel according to claim 1, wherein the first connecting member and the second connecting member are provided in different through-ports of the main body member so as to be substantially perpendicular to each other in the in-plane direction.
3. The photovoltaic power generation panel according to claim 2, wherein the first connecting member and the second connecting member are formed from the same material.
4. The photovoltaic panel according to claim 2, wherein the first connecting member and the second connecting member are formed of different materials.

Description

This invention relates to a solar power generation panel. Conventionally, such a technical field includes, for example, the one described in Patent Document 1. The photovoltaic panel described in Patent Document 1 comprises a surface protection substrate, a sealing layer for sealing photovoltaic elements, at least one reinforcing layer located between the surface protection substrate and the sealing layer, and a back surface protection substrate. The surface protection substrate, reinforcing layer, sealing layer, and back surface protection substrate are each formed from different types of materials and are fixed to each other in a laminated state along the direction of light incidence. Japanese Patent Publication No. 2019-083248 This is a schematic cross-sectional view showing a solar power generation panel according to an embodiment.This is a schematic plan view showing the stress relaxation layer.This is a schematic plan view illustrating the deformation of the stress relaxation layer during heating.This is an enlarged view showing portion A in Figure 3.This figure shows the thermal stress distribution of the example (invention).(a) is a schematic cross-sectional view showing a photovoltaic panel relating to a comparative example (conventional product), and (b) is a diagram showing the thermal stress distribution of the comparative example (conventional product). The embodiments of the photovoltaic power generation panel according to the present invention will be described below with reference to the drawings. In the description of the drawings, identical elements are denoted by the same reference numerals, and redundant explanations are omitted. Furthermore, in the following description, unless otherwise specified, "side surface" refers to the end surface aligned with the direction of light incidence (in other words, the end surface parallel to the direction of light incidence), assuming that sunlight is incident perpendicularly on the photovoltaic power generation panel, and "thickness" refers to the distance aligned with the direction of light incidence. Figure 1 is a schematic cross-sectional view showing a photovoltaic power generation panel according to an embodiment. As shown in Figure 1, the photovoltaic power generation panel 1 of this embodiment is flat and comprises a photovoltaic element 2, a sealing layer 3 that seals the photovoltaic element 2, a surface protection layer 4 positioned on the light incidence side relative to the sealing layer 3, a back surface protection layer 5 positioned on the opposite side from the light incidence side relative to the sealing layer 3, and a thin plate-shaped stress relaxation layer 6 positioned below the photovoltaic element 2 in the light incidence direction and sealed together with the photovoltaic element 2 in the sealing layer 3. The surface protection layer 4, the sealing layer 3 with the photovoltaic element 2 and stress relaxation layer 6 arranged inside, and the back surface protection layer 5 are sequentially laminated along one direction (in this case, the direction of sunlight incidence). The photovoltaic element 2 is not particularly limited, but may be a crystalline silicon-based photovoltaic element or a perovskite-type photovoltaic element. In this embodiment, the photovoltaic element 2 is made of single-crystal silicon. This photovoltaic element 2 may be a single element or a plurality of electrically connected elements. The sealing layer 3 serves to protect the photovoltaic element 2 from impact while preventing deterioration due to moisture and other factors, and is provided to surround the entire photovoltaic element 2. This sealing layer 3 is formed in a flat plate shape from a resin material that has transparency (e.g., light transmittance of 90% or more) that allows sunlight to pass through, and also possesses chemical stability. Examples of such resin materials include EVA (ethylene vinyl acetate copolymer resin), polyolefin, and PVB (polyvinyl butyral). The surface protection layer 4 is a component that protects the surface side of the photovoltaic element 2 and has a flat plate shape. The surface protection layer 4 is formed from a transparent material (e.g., with a light transmittance of 90% or more) that has barrier properties against water and gas, as well as scratch resistance, and transmits sunlight. This surface protection layer 4 can be made from materials such as glass plates, polycarbonate, polyethylene terephthalate, polyamide, polyimide, or polytetrafluoroethylene resin sheets. The back surface protective layer 5, also called the support layer, is a component that protects the back side of the photovoltaic element 2 and has a flat plate shape. The back surface protective layer 5 can be made of any material that has barrier properties against water and gas, as well as scratch resistance, and is formed from a transparent or opaque material. This back surface protective layer 5 can be made from glass plates, polycarbonate,