JPS636157B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection structure for a large number of solar cell elements, and relates to a structure in which the shape of connection leads is improved to enable easy and reliable connection.

Since the output voltage of a single solar cell element is as low as about 0.45 volts, a solar cell device is practically constructed by connecting several dozen solar cell elements in series. As shown in FIG. 1, the series connection of a large number of these solar cell elements is carried out by connecting the light-receiving surfaces of adjacent solar cell elements 1 and the opposite surface, ie, the back surface, with leads 2. There is.

The connection between the lead 2 and the solar cell element 1 can be made by bonding the lead to a metallized electrode provided in advance on the light-receiving surface or back of the solar cell element with solder, or
This method is implemented by bonding leads onto the electrodes. Note that (b) shows the -' cross section of (a). The conventional method of connecting a large number of solar cell elements in series has the following drawbacks.

(1) When placing leads on the light-receiving surface of a solar cell element and the back side of an adjacent element connected in series with this solar cell element, in the example in Figure 1, the leads and solar cell element are placed from the left side of the figure. , leads must be arranged in this order, and it is difficult to arrange a large number of solar cell elements and a large number of leads at once.

(2) Solar cell elements are approximately 0.2 to 0.5 mm thick, and the thickness variation is several hundred percent;
It is difficult to prepare and arrange leads having steps corresponding to this variation in thickness.

For this reason, conventionally, soft leads that are easily deformed have been used and series connections have been manually made, and automation has been difficult.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the conventional example and to provide a connection structure in which the arrangement of solar cell elements and leads can be easily performed and can be automated.

In the present invention, a lead for connecting solar cell elements to each other is used, one end of which is bent to a length greater than the thickness of the solar cell element, and the solar cell elements are connected to each other by connecting the above-mentioned bent parts to each other. It is characterized by the fact that

When a round wire lead 21 with one end bent is placed on a plane having a step 4 at one end with the bent portion of the lead protruding toward the step side as shown in FIG. 2, a rotational moment due to the weight of the bent portion acts. The lead rotates in the direction of the arrow in the figure and stops at the position indicated by the dotted line in the figure. The present invention utilizes this principle.

Examples will be described below. FIG. 3 is a diagram showing an example of the lead 22 according to the present invention. The diameter of the round wire is 1 mm, and one end of this round wire is bent into a semicircular shape with a radius of 4 mm. The surface of the lead 22 is coated with solder in advance. FIG. 4 shows a schematic diagram of a solar cell device in which solar cell elements are connected in series, which is an embodiment of the present invention. (b) is the −′ cross section of (a). The interval between each solar cell element is about 8 mm. The series connection of the solar cell elements 1 at this time is performed as follows. First, a predetermined number of solar cell elements 1 are placed on a predetermined number of leads 221 arranged in advance so that the unbent ends (other ends) of the leads 221 are arranged at predetermined positions on the back surface of the solar cell elements. Then, the lead 222 to be connected to the light-receiving surface side of the solar cell element is placed at a predetermined position on the solar cell element. If the predetermined positions for placing the leads 221, 222 and the solar cell element 1 are set at a position where the bent portions of the leads 221 and 222 overlap each other and do not overlap with the adjacent solar cell element 1, the lead 222 can be bent at one end. The bent portion contacts at least one portion of the bent portion of the lead 221 by rotating due to its own weight. It is clear that if the solar cell element and the leads are arranged in the above-described positional relationship, they can be placed at a predetermined position at the same time. This also facilitates automation of placement.

If the arrangement as described above is placed in an electric furnace and heated to melt the solder, a large number of solar cell elements can be connected in series with leads.
Note that the diameter of each lead, the radius of the bent portion, and the manner in which the lead is bent may be varied as desired. Also,
Similarly, the bonding method can also be used to connect the solar cell element and the leads.

As explained above, according to the present invention, the work of arranging the leads necessary for serially connecting a large number of solar cell elements to predetermined positions of the solar cell elements can be easily and reliably performed, which facilitates automation. ,
The economic benefits are enormous. Further, even if there are variations in the thickness of the solar cell elements, there is an effect that the connection can be made reliably.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a conventional example of a large number of solar cell elements connected in series, Fig. 2 is a schematic diagram illustrating the rotational movement of a round wire with one end bent, and Fig. 3 4 is a schematic diagram of an example of a lead according to the present invention, and FIG. 4 is a diagram showing an embodiment of the present invention. 1...Solar cell element, 2, 22, 221, 22
2...Lead.

Claims (1)

[Claims] 1. A plurality of solar cell elements arranged in parallel at predetermined intervals, and a plurality of first solar cell elements connected to the back surface of each solar cell element, one end of which is exposed to the side of the adjacent solar cell element. It consists of a lead, a rod-shaped part with a circular cross section, and a bent part with a length equal to or longer than the thickness of the solar cell element provided at one end.The rod-shaped part is connected to the light-receiving surface of each solar cell element, and the bent part is adjacent to 1. A solar cell device comprising: a plurality of second leads extending to the exposed portion of the first lead of a solar cell element and connected to the first lead. 2. A solar cell device according to claim 1, characterized in that the first lead has the same shape as the second lead.