JP2000315811A - Method for serially connecting solar battery element, and solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for serially connecting solar battery elements and a solar battery module for increasing power generating efficiency per area by reducing the interval between solar battery elements, and for simplifying manufacturing, and for increasing the reliability of connections. SOLUTION: A plurality of solar battery elements 1 are arrayed, so that the polarities of the surface sides of adjacent solar battery elements 1 are made mutually different, and the surface sides and back sides of the adjacent solar battery elements 1 are electrically connected through interconnectors 2, so that the plural solar battery elements 1 are serially connected. The interconnectors 2 are not arranged from the surface sides to backsides of the solar battery elements 1, and the solar battery elements 1 can be prevented from cracking or being short-circuited. Also, a connecting work by soldering or the like can be simplified, and miniaturization can be realized, and power generating efficiency per area can be increased, and the reliability of the connections can be made superior.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for connecting solar cells in series and a solar cell module.

[0002]

2. Description of the Related Art Conventionally, for example, in a series connection of crystalline silicon solar cell elements, as shown in FIG. 3 (a), all solar cell elements a have the same polarity on the front side b, that is, all solar cell elements a have the same polarity. A plurality of solar cell elements a are arranged with the polarity on the front side b being positive or negative, and the front side b and the rear side d of the adjacent solar cell element a are electrically connected by the interconnector c. Thus, they were connected in series.

[0003]

However, in the case of such a connection, it is necessary to provide a space of about 1 to 2 mm between the solar cell elements so that the interconnector can be inserted. As used in, for a solar cell module that is required to have a high power generation efficiency per area while being extremely small, it is an unsuitable connection method, and if the interval between the solar cell elements is forcibly reduced, Since the interconnector is disposed so as to extend from the front side of one solar cell element to the back side of the other solar cell element, the solar cell element may be broken or short-circuited.

On the other hand, in order to solve this problem, FIG.
As shown in (b), a connection method generally called tile-laying has been put to practical use. This method is the same as the method shown in FIG. 3A in that all the solar cell elements a are arranged with the same polarity on the front side b, but each solar cell element is a is stacked on the end of the adjacent solar cell element a, so that the front side b of one solar cell element a and the back side d of the other solar cell element a are electrically connected. Have been. This method does not require the use of interconnectors and can be downsized,
There are drawbacks in that the manufacturing process is complicated and the reliability of the connection between the solar cell elements is poor.

Therefore, the present invention solves the above-mentioned problems,
An object of the present invention is to provide a method of serially connecting solar cell elements and a solar cell module which are easy to manufacture and have a high reliability of the connection portion, by reducing the interval between the solar cell elements and increasing the power generation efficiency per area. It is.

[0006]

In order to achieve the above object, the present invention has the following arrangement. That is, in the method for connecting solar cells in series according to the present invention, a plurality of solar cells are arranged so that the polarities on the surface side of adjacent solar cell elements are different from each other, and the surface side and the surface of the adjacent solar cell elements are different. The solar cell according to the present invention is characterized in that a plurality of solar cell elements are connected in series by electrically connecting the side, and the back side and the back side with an interconnector, respectively. The module is characterized in that a plurality of solar cell elements are connected in series by the method for connecting solar cell elements in series according to claim 1.

According to the present invention, even if the interval between the solar cell elements is reduced from the conventional 1-2 mm to about 0.5 mm or less, the interconnector is arranged so as to extend from the front side to the rear side of the solar cell element. Therefore, there is no possibility that the solar cell element is broken or short-circuited, or connection work by soldering or the like is facilitated. Further, there is no possibility that the reliability of the connection portion is reduced unlike the connection method of the tiled type. Therefore, the module can be manufactured easily at low cost, the module can be reduced in size, the power generation efficiency per area increases, and the reliability of the connection portion is excellent.

[0008]

Next, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of FIG.

In the drawings, reference numeral 1 denotes a solar cell element;
In this solar cell element 1, the polarities of the front side 11 (light receiving surface side) of the adjacent solar cell elements 1 are different from each other, that is, the polarities of the front side 11 of the adjacent solar cell elements 1 are plus, minus, plus, So that the polarity of the back side 12 is conversely negative, positive,
They are arranged to be negative and positive. The solar cell elements 1 thus arranged are electrically connected by the interconnector 2 to the front side 11 and the front side 11 and the rear side 12 and the back side 12 of the adjacent solar cell elements 1 respectively. , Are connected in series.

The solar cell element 1 may be of a double-sided light receiving type in which a front side 11 and a back side 12 are each a light receiving surface. In this case, the polarity of the front side 11 is different, that is, the front side is different. , Back, front, and back may be arranged alternately on opposite sides, or only the front side 11 may be a light receiving surface. In this case, the polarities of the light receiving surfaces are different. What is necessary is to prepare two types, that is, a light receiving surface having a positive polarity and a negative light receiving surface, and to alternately arrange the light receiving surfaces having different polarities.

In the case where the solar cell element 1 of the double-sided light receiving type is used, it is preferable to use a solar cell element having the same output characteristics even when light is incident from either the front side 11 or the rear side 12. When two types of solar cell elements 1 having different light receiving surfaces are used, it is preferable to use one having the same output characteristics.

A solar cell module in which a plurality of solar cell elements 1 are connected in series by the method for connecting solar cell elements 1 in series according to the present invention is obtained by connecting the solar cell elements 1 connected in series via a transparent filling resin. It may be a so-called super straight type sandwiched between a light-transmitting plate on the front side and a weather-resistant film on the back side, or a weather-resistant film on the front side and a plate on the back side via a transparent filling resin. And a solar cell element 1 connected in series, or a filling type in which a solar cell element 1 connected in series is filled in a translucent case via a transparent filling resin, or a resin pot. It may be what is called a tent type, and is not particularly limited.

[0013]

According to the present invention, even if the interval between the solar cell elements is reduced from the conventional 1-2 mm to about 0.5 mm or less, the interconnector turns from the front side to the rear side of the solar cell element. Since they are not arranged, there is no possibility that the solar cell element is broken or short-circuited, or connection work by soldering or the like becomes easy. Further, there is no possibility that the reliability of the connection portion is reduced unlike the connection method of the tiled type.
Therefore, the module can be manufactured easily at low cost, the module can be reduced in size, the power generation efficiency per area increases, and the reliability of the connection portion is excellent.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solar cell element 11 Front side 12 Back side 2 Interconnector

Claims (2)

[Claims] Claims: 1. A plurality of solar cell elements are arranged such that the polarities on the surface side of adjacent solar cell elements are different from each other;
A solar cell in which a plurality of solar cell elements are connected in series by electrically connecting the front side and the front side and the rear side and the back side of adjacent solar cell elements with an interconnector, respectively. How to connect the elements in series. 2. A solar cell module, wherein a plurality of solar cell elements are connected in series by the method for connecting solar cell elements in series according to claim 1.