DE2113410C - Solar cell - Google Patents

Description

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The invention relates to a single crystal solar cell rinem material of the type η on ρ or ρ on n, before preferably a silicon solar cell, the light-sensitive upper side of which is covered with a cover glass, and tlie with electrically conductive connectors by soldering od (ir welding are combined into modules that are applied to an insulating carrier film.

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the cell through
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Meteorite protection. ^, ~ _r -— _| - ■. . - ---- Adaptation of the cells to the receiving light and

reduces reflection losses.

In order to be able to interconnect the individual solar cells with other solar cells, it is common to use the contact bar to leave free. For manufacturing reasons, the contact surface can not go all the way to

so the edge of the solar cell can be used. It stays thus unprotected areas of the cell exist is only a few μ thick, the risk of damage from high-energy particles is very high.

»5 Furthermore, the contact bar is also against mechanical ones Damage from vibration or cleaning unprotected. For a welded connector, there is one Replacing an individual solar cell is not possible, since the contact connection cannot be made without Bc-

Damage to the light-sensitive upper side of the cell can be solved and, on the other hand, the lower side with their contact surface is not accessible as a result of being glued to a substrate. In this case, m.iss so the whole module can be removed.

In order to avoid electrostatic fields, the cover glass is covered with a transparent one if the requirements are high Electrically conductive coating provided The coatings of the individual glasses must be provided with additional Connectors are interconnected, with a possible

lent a high degree of coverage is sought. Both

; Solar cells that have been customary up to now and whose cover glasses leave the contact surface free, this requirement is difficult to meet.
Finally, an essential process is the measurement of the cell with the cover glass applied. With the measuring process, the effects of the glass can be recorded, but not damage caused by soldering or welding.

The object on which the invention is based is to be seen in the provision of a solar cell as a component create that is largely protected against external influences and in which further interconnection work only have to be done on the connectors and on the insensitive underside. The finished one Once the conductive connection has been established, the unit can measure, classify and cells if possible small deviation can be put together in order to achieve an optimal performance yield. Closing

A cell should be created for the one without Consideration of radiation damage to the contact surface

can be reduced to a cell with higher

To achieve performance. According to the invention, this object is achieved

suggested that the entire top of the cell including the contacts and the already attached to the Contacts attached connector is provided with a cover glass. This technique is also used with cells

applicable, with which, in contrast, air winding cell, a glued cover glass on so-called mtejedoch in a similar technique to use both contacts on grated cover glass, for example the top are guided. When used, it can be vapor-deposited onto the top of the cell from kon-. at conventional cells with p- and η-contacts on the use of an adhesive winider connector 3 iuüJer The top and bottom of the cells is the invention S by the welding or the soldering nor by the also applicable. To produce a series shrinkage of the adhesive between the cover slip and With conventional cells, the connector is like being held in a pair of pliers shaped so that it increases electrical safety directly with the contact on the underside

the followerMsn cell is connectable. For the production in Fig. 2 are already in connection with

a parallel connection is the use of one of the io Fig.1 parts with the same ßzug-connectors for the series connection provided independent allocation. In addition, the nut is the stopper suggested. side of the contact surface of the solar cell by soldering

The SolarzeDe according to the invention comprises a series or welded connector 6 emgezeichvon Advantages over the well-known solar cells net- For manufacturing reasons, this can on. First of all, the cell including the contact connector is expediently made of one piece, the In the present case, there are three outwardly projecting areas to protect against damage covers the contact area including the connecting flags connection with the electrically conductive connector is through the contacted component, all Mesdas can now Cover slip better protected by reducing solutions made to the final dader Provide contact areas on the absolutely necessary so. This fully protected construction dimension the cell output can be significantly increased. The element is used to manufacture larger units (mower used without a cover slip with complicated formulas, strings) The use of a die men to fall back on. Measuring the top of the solar cell is protective * cover glass Cell is made on the finished component, so sufficient against damage, corrosion of the condass Cell damage when attaching the »5 contact surface and the welding or soldering point. So is binder can be seen before further interconnection is a partially simplified production process Cleaning the contact surface from excess bound, as both cleaning the contact surface Glue that is used when putting on the cover slip and when positioning the square cover Contact page oozes out, is very complex. Die-glas is facilitated.

this operation can be omitted. Finally, the 30F i g. 3 shows a series connection of two solar Positioning through the use of a square cell. As can be seen from the figure, both the table cover glass simplified, a higher connection of the left solar cell as well as that of the Achieved degree of coverage and achieved that all connec- underside of the right solar cell led out evaporation To further interconnect the cell, just pull it out upwards on the connector 6 and, for example term component need to be executed. It 35 connected to one another by spot welding 7. the it should also be mentioned that the cell according to the Er number of a connecting element 3 or 6 is found To be called repair-friendly, orderly flags are based on the special ones can, d. that is, a defective cell has no further requirements. The when interconnecting the Solaraus a module or string can be removed, cells still to be made connections without having to replace the larger unit. 40 final flags with each other or with the underside

In the drawing, exemplary embodiments after contacts, as experience shows, do not represent an invention, namely FIG. 1 flow more on the performance of the cell,
a partial section through a solar cell with cover glass, the solar cells are connected in series in the

F i g. 2 the solar cell as a finished component, FIG. 3 way as shown in Fig. 3 was shown. It has the series connection of two solar cells and Fig. 4 45 proved to be useful, at the same time as the series one Parallel and series connection. connection to connect the connector for parallel connection

In Fig. 1 is denoted by 1, the solar cell, bring on. This is shown in FIG. 4 reproduced. The after the surface of which a contact bar 2 is sandwiched by connectors 3 and 6 guided above attenuation is applied. With the contact surface 2, for example, a connector 8 with a rectangular a connector 3 is connected by soldering or welding 50 cross-section. Through a spot weld that is marked 9 bound. In the illustrated embodiment, an- is denoted, both series and the taken that the top of the cell is made uniformly in parallel. But it is also conceivable doped and provided with the appropriate contact the connection required for the parallel connection. The second contact is on the underside of the cells, separate from that page. However, it is possible to connect 55 connectors necessary for the series connection in the case of cell production Attachment of the second contact on the upper level. This has the advantage that on a user side, the top-side doping in about contact dung on flexible generators the rolling direction of the area size to remove. The underside of the contact · connecting material independently of each other is brought up to these contact surfaces. Can be chosen for optimal reliability According to the invention, the solar cell can be enclosed under mechanical loads. On lent their contact surface with the help of an adhesive 4 a place of a flat parallel connector 8 can also Cover glass S applied. It is also possible to choose any other cross-sectional shape instead.

1 sheet of drawings

Claims (11)

Patent claims: L Solar from single-crystal material »!. De, Typesn on ρ or ρ on n, preferably silicon solar cells, whose light-sensitive upper side is covered with a cover glass and the one with electronic Conductive connectors are combined by soldering or welding to form modules that are on an insulating Carrier film are applied, thereby gek e η η ζ e i c h η et that the entire top the cells including the contacts and the connectors already attached to the contacts (3) is provided with a cover glass (S) 2. Solar cell according to claim 1, characterized in that both contacts lie on the top of the cell. "? SSfcS claim I, marked by p and n contacts on the top and bottom of the cell. 4. Solar cell according to claim 3, gekauuckhaet by such shaped connectors (3) that these directly with the underside contacts of the following Cell are connectable. 5. Solar cell according to claim 3, characterized by the use of one of the connectors for Series connection of an independent connector to create a parallel connection. 6. Solar cell according to claim 3, characterized in that that separate on both the top and the bottom contact surfaces Connector (3) are attachable. 7. Solar cell according to claims 2 and 6, characterized in that the connector (3) the corresponding top and bottom contacts for the sensor circuit in an electrically conductive manner with one another are connected. 8. Solar cell according to claim 7, characterized in that that for parallel connection one independent of the connectors for series connection Connector is used. 9. Solar cell according to claim 7, characterized in that simultaneously with the series circuit the connector for parallel connection is attached. 10. Solar cell according to claims 7, 8 or 9, characterized by a cell with exclusively underside contact arrangement, in which the connector of the corresponding underside contacts are electrically connected to one another and for a In parallel, an independent connector is used, which is also used at the same time as the Series connection is attached. 11. SolarzeUe according to claims 7, 9 or 10, characterized in that a module-module connection to so-called strings. It is known to veiv solar cells with cover glasses which are glued to the top using a transparent adhesive. Likewise