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Method for electrically connecting several solar cells and photovoltaic module

A technology for solar cells and photovoltaic modules, applied in electrical components, photovoltaic power generation, electrical solid devices, etc., can solve problems such as non-solderable welding and complexity, and achieve reliable electrical contact, metallization and reliability.

Inactive Publication Date: 2014-04-23
INST FUR SOLARENERGIEFORSCHUNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials are not inherently solderable and thus previously required the application of a further solderable layer of the metal which is complex and expensive

Method used

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  • Method for electrically connecting several solar cells and photovoltaic module
  • Method for electrically connecting several solar cells and photovoltaic module
  • Method for electrically connecting several solar cells and photovoltaic module

Examples

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Embodiment Construction

[0056]figure 1 A configuration of a plurality of metallized solar cells 20 electrically connected together and formed into a photovoltaic module 100 is shown. In the example shown, the solar cell 20 is a silicon wafer-based solar cell in which two types of contacts are provided on the back side of the solar cell substrate 1 . The emitter region of the solar cell is coated with an aluminum metal layer 2a forming a contact of the first type and the base region is coated with an aluminum metal layer 2b forming a contact of the second type.

[0057] Figure 5 A top view of a solar cell substrate 1 with metal layers 2a, 2b forming different types of contacts is shown.

[0058] For greater clarity, further details of the solar cell 20 are not shown in the figures, eg differently doped emitter and base regions, surface passivation layers, etc.

[0059] In preparation for the metallization process, the carrier substrate 4 is coated with a metal layer 3 which also consists of aluminu...

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Abstract

The invention relates to a method for metallizing and connecting solar cell substrates (1) and to a photovoltaic module (100) made of several metallized solar cells (20) that are electrically connected to one another. According to the invention, a solar cell substrate (1), in which second metal layers (2a, 2b) forming electrical metal contacts are optionally provided, is attached to a carrier substrate (4), on the surface of which at least one first metal layer (3) is formed in a suitable pattern. By localized irradiation of the metal layer (2, 3) with laser radiation (5, 6) through the solar cell substrate (1) or the carrier substrate (4), energy is introduced such that the metal layer (2, 3) is heated by absorbed laser radiation (4, 5) for an irreversible bonding to the adjacent surface of the solar cell substrate (1). By the laser bonding of the metal layer (3) on the carrier substrate (4) to the solar cell substrate (1), solar cells can be connected to form a photovoltaic module, wherein conventional soldering of adjacent solar cells via metal bands is no longer required. Non-solderable, cost-effective, in particular silver-free metal layers (2a, 2b) can thus be used for contacting the solar cell substrates (1) of the solar cells (20).

Description

technical field [0001] The present invention relates to methods of metallizing and electrically connecting multiple solar cells. The invention also relates to photovoltaic modules thus constructed. Background technique [0002] The surface of the solar cell substrate must often be metallized, eg to allow electrical connection to the solar cells, in particular to be able to electrically connect different solar cells together. The metallization of the solar cell should first of all be mechanically robust and therefore stable over the typical service life of a solar cell module, for example 30 years, in order to keep degradation effects as low as possible. Secondly, through the metallization, good electrical contacting of the solar cell substrate should be achieved with the lowest possible electrical resistance. Furthermore, the metallization should be carried out reliably and economically on an industrial scale. [0003] In the production of photovoltaic modules, a pluralit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/05H01L31/042
CPCH01L31/02008H01L2924/0002H01L31/0504H01L31/0516H01L31/042H01L25/042Y02E10/50H01L31/188H01L31/0445H01L2924/00
Inventor 亨宁·舒尔特-霍克赛尔苏珊娜·布兰克梅耶尔罗尔夫·布伦德尔罗伯特·伯克托尔斯特恩·杜尔伟伯尔尼尔斯-彼得·哈德尔卡斯滕·汉佩叶夫根尼娅·拉瑞奥诺娃
Owner INST FUR SOLARENERGIEFORSCHUNG
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