JPH0448660A - Solar battery module - Google Patents

Abstract

PURPOSE:To acquire a solar battery module of high effective efficiency by reflecting light projected to a connection part between a bus electrode and an interconnector to an effective part which can convert light of a solar battery to current by a reflection surface of an interconnector edge part forming a specified acute angle at a position higher than a solar battery surface. CONSTITUTION:A surface electrode 5 is composed of a grid electrode 5a and a bus electrode 5b. One end of an interconnector 7 is connected to a rear electrode 6 of one solar battery, and is bent vertically from its connection part. The interconnector 7 is extended along an edge surface of the solar battery and bent to a direction of an adjacent solar battery to form an acute angle of 45 deg. or less at a position higher than a solar battery surface to from a reflection surface 7a which reflects incident light to an effective part of a solar battery which converts solar battery light to current. Therefore, it is possible to increases an effective area and to improve effective efficiency by reflecting light injected to a connection part of the bus electrode 5b and the interconnector 7 to an effective part which converts light of solar battery to current by a reflection surface of the interconnector 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solar cell module in which solar cells are connected by interconnectors.

[Conventional technology]

3(a) and 3(b) are diagrams showing a conventional solar cell module in which, for example, solar cells are connected by an interconnector, FIG. 3(a) is a plan view of the structure, and FIG.
b) is a cross-sectional structural diagram.

In FIG. 3, 1 is a semiconductor substrate of a first conductivity type, 2 is a semiconductor layer of a first conductivity type, 3 is a semiconductor layer of a second conductivity type, 4 is an antireflection film, and 5 is a surface electrode. It consists of a common electrode (bus electrode) 5b to which a collector electrode (grid electrode) 5a for collecting photocurrent and a collector electrode 5a for electrical connection to the outside of the solar cell are connected. 6 is the back electrode,
Reference numeral 7 indicates an interconnector that electrically connects a plurality of solar cells, in this example two solar cells.

In FIG. 3, a semiconductor layer 2 of a first conductivity type and a semiconductor layer 3 of a second conductivity type are formed on a semiconductor substrate 1 of a first conductivity type by a crystal growth method such as an LPE method or an MOCVD method. Ru. Then, an antireflection layer 4, a surface electrode 5. Back electrode 6
is formed. The solar cell formed as described above is electrically connected to other solar cells by an interconnector 7 by a method such as welding to form a solar cell module.

[Problem to be solved by the invention]

Since the conventional solar cell module is constructed as shown in the diagram, the light that enters the connection part between the bus electrode 5b and the interconnector 7 is reflected at the top and does not enter the solar cell, so it is converted into electric current by photoelectric conversion. There was a 1lJWi point where it could not be taken out and the effective efficiency would be low.

This invention was made in order to solve the above-mentioned problems, and it is possible to obtain a solar cell module with high effective efficiency by effectively utilizing the light incident on the connection part by bus electrodes and interconnectors. purpose.

[Means to solve the problem]

In the solar cell module according to the present invention, one end of the interconnector is connected to the back electrode of one of the adjacent solar cells, and the interconnector is bent perpendicularly from this connection part so as to fit along the end surface of the solar cell. Stretch it out, and then bend it in the direction of the other adjacent solar cell so as to form an acute angle of 45° or less at a position higher than the surface of the solar cell to form a reflective surface that reflects incident light, and furthermore, the other end of the interconnector It is bent and connected to the bus electrode of the other solar cell.

[Effect]

The solar cell module according to the present invention has a solar cell that has a reflective surface at the end of the interconnector formed at an acute angle at a position higher than the surface of the solar cell. By reflecting light on an effective part that can convert it into electric current, it is possible to increase the substantial effective area and increase the effective efficiency.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1(a) and 1(b) are a plan view and a cross-sectional view of a solar cell module showing an embodiment of the present invention. In FIG. 1, 1 is a semiconductor substrate of a first conductivity type;
2 is a semiconductor layer of a first conductivity type, 3 is a semiconductor layer of a second conductivity type, 4 is an antireflection film, and 5 is a surface electrode, which consists of a grid electrode 5a and a bus electrode 5b. 6 is a back electrode, and 7 is an interconnector, one end of which is connected to the back electrode 6 of one solar cell, bent vertically from the connection part, extended along the end surface of the solar cell, and connected to the solar cell. A reflective surface 7a is formed at a position higher than the surface of the battery cell and is bent toward the adjacent solar cell so as to form an acute angle of 45° or less, and reflects incident light to an effective part of the solar cell that converts the incident light into an electric current. Further, the bus electrode 5b of the adjacent solar cell is connected to the peripheral edge of the solar cell on the bus electrode 5b by being bent in the direction of the peripheral edge at the farthest point.

The apex portion forming an acute angle from the connection portion with the back electrode 6, that is, the vertical portion 7b has a mesh structure.
The structure is designed to reduce mechanical stress when connecting solar cells.

As can be seen from the structure of FIG. 1 shown in the above embodiment, in this embodiment, the light incident on the connection portion between the bus electrode 5b and the interconnector 7 is formed so as to form an acute angle at a position higher than the solar cell. The reflective surface of the interconnector 7 reflects light from the solar cell to an effective portion that converts it into current, thereby increasing the effective area and increasing the effective efficiency.

In addition, by forming the vertical portion 7b of the interconnector 7 into a mesh structure, it is possible to reduce mechanical stress when connecting solar cells with the interconnector 7, thereby reducing the characteristic deterioration of the solar cells during thermal cycle tests, etc. , it is possible to reduce cracks in solar cells and improve yield and reliability.

Note that in the above embodiment, the bus electrode 5b and the interconnector 7
Although the description has been made of a solar cell in which the connection part between the bus electrode 5b and the interconnector 7 is close to the length of one side of the solar cell cell, even in a solar cell in which the connection part between the bus electrode 5b and the interconnector 7 is small, the second
As shown in Figures (a) and (b), the interconnector 7, which has the same width as the connection part to the bus electrode 5C, is connected by forming an acute angle part at a position higher than the solar cell. A similar effect can be obtained with respect to parts.

〔Effect of the invention〕

As explained above, this invention connects one end of the interconnector to the back electrode of one adjacent solar cell,
Bend the interconnector vertically from this connection part, extend it along the end face of this solar cell, and then attach it to the other adjacent solar cell so that it forms an acute angle of 45° at a position higher than the surface of this solar cell. By bending it in the direction of the cell to create a reflective surface that reflects incident light, and further bending the other end of the interconnector and connecting it to the bus electrode of the other solar cell, the incident light can be used effectively and solar panels with high effective efficiency can be used. The effect that a battery module can be obtained is obtained.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are plan view and cross-sectional structural views showing a solar cell module according to one embodiment of the present invention, and FIGS. 2(a) and (b) show another embodiment of the present invention. FIGS. 3(a) and 3(b) are a plan view and a cross-sectional view of a conventional solar cell module. In the figure, 1 is a semiconductor substrate of a first conductivity type, 2 is a first conductivity type semiconductor substrate, and 2 is a first conductivity type semiconductor substrate.
3 is a semiconductor layer of a second conductivity type; 4 is a semiconductor layer of a second conductivity type;
5 is an anti-reflection film, 5 is a surface electrode (5a is a grid electrode, 5 is a
b is the bus electrode), 6 is the back electrode, 7 is the interconnector,
7a is a reflective surface, and 7b is a vertical portion. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent: Masuo Oiwa (2 others) Figure 1 Figure 2 5C bus tram”

Claims (1)

[Claims] In a solar cell module in which a plurality of parallel solar cells are connected by an interconnector, one end of the interconnector is connected to the back electrode of one of the adjacent solar cells, and the interconnector is vertically connected from this connection part. Bend it and stretch it along the end face of this solar cell, and then stretch it at a position higher than the surface of this solar cell.
The interconnector is bent in the direction of the other adjacent solar cell so as to form an acute angle of less than 1000 degrees to form a reflective surface that reflects incident light, and the other end of the interconnector is further bent and connected to the bus electrode of the other solar cell. A solar cell module characterized by: