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String connection structure, component and method of p-type crystalline silicon back-contact bifacial battery

A double-sided cell and connection structure technology, applied in the field of solar cells, can solve problems such as process requirements, high production costs, and poor compatibility, and achieve the effects of reducing light-shielding area, reducing production costs, and improving the front

Active Publication Date: 2018-11-09
ZHEJIANG LEYE PHOTOVOLTAIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the series connection of P-type back-contact double-sided cells usually requires the use of conductive backplanes and conductive adhesives, which requires additional processes such as dispensing, EVA drilling, and alignment. The process requirements and production costs are relatively high. The compatibility of component packaging equipment is poor

Method used

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  • String connection structure, component and method of p-type crystalline silicon back-contact bifacial battery
  • String connection structure, component and method of p-type crystalline silicon back-contact bifacial battery
  • String connection structure, component and method of p-type crystalline silicon back-contact bifacial battery

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) Make a positive electrode reflective ribbon with a width of 1.5mm on the positive silver busbar on the back of the entire P-type monocrystalline silicon back-contact double-sided battery; make a negative electrode with a width of 1.5mm on each row of via-hole silver electrodes Reflective ribbon. The positive and negative reflective ribbons of adjacent battery slices are connected to connect the battery slices into a battery string.

[0052] (2) Laminate in the order of ultra-clear tempered glass, EVA, battery string, EVA, and ultra-clear tempered glass.

[0053] (3) Laminate the stack formed in step (2) in a laminator to cross-link the EVA, and combine the battery string and the ultra-clear tempered glass on the front and back as a whole.

[0054] (4) After processing such as trimming, framing, and junction box installation, a photovoltaic module that can be used for double-sided power generation is formed.

Embodiment 2

[0056] (1) During the electrode manufacturing process of the battery sheet, a 2mm-wide positive extension structure is provided for the positive busbar on the back side. The hole electrodes are connected by silver grid lines, and form a negative electrode extension structure with a width of 2 mm on the other side of the edge of the silicon wafer, and the extension structure vertically intersects with the silver grid lines on the via hole electrodes. The positive and negative electrode extension structures are oppositely arranged on the back of the battery.

[0057] (2) Coating solder paste on the positive and negative extension structures of the battery, and combining the positive and negative extension structures of adjacent batteries through a 3mm wide copper strip to form a battery string.

[0058] (3) Laminate in the order of ultra-clear tempered glass, PVB, battery string, PVB, and ultra-clear tempered glass.

[0059] (4) Laminate the stack formed in step (2) in a lamina...

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Abstract

The invention provides a pack string connection structure of a P-type crystalline silicon back contact double-sided battery, an assembly and a method. The pack string connection structure comprises at least two battery pieces, and is characterized in that positive electrode flow guide strips and negative electrode flow guide strips are distributed at intervals at the back of the battery pieces, the positive electrode flow guide strips connect back positive electrode thin grid lines in each row, the negative electrode flow guide strips connect a plurality of via-hole silver electrodes in each column, and the positive electrode flow guide strips and the negative electrode flow guide strips are mutually insulated; the positive electrode flow guide strips and the negative electrode flow guide strips of the adjacent battery pieces are connected in series through conductive connecting bands so as to form a battery pack string; or the positive electrode flow guide strips and the negative electrode flow guide strips of each battery piece are respectively collected at a positive electrode current collecting strip and a negative electrode current collecting strip at the opposite sides of the battery piece so as to form interdigital electrode structure, and the positive electrode current collecting strips and the negative electrode current collecting strips of the adjacent battery pieces are connected in series through conductive connecting bands so as to form a battery pack string. The pack string connection structure greatly enhances the integration degree with an existing assembly packaging process, improves the conversion efficiency of the assembly and simplifies the process.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a string connection structure, component and method of a P-type crystalline silicon back-contact double-sided cell. Background technique [0002] At present, crystalline silicon solar cells account for more than 90% of the global market for solar cells, and the conversion efficiency of crystalline silicon cell production lines has exceeded 21%. The cost of electricity continues to shrink and is expected to be flat in the next few years. As a clean energy source, crystalline silicon solar cells play an increasingly important role in changing the energy structure and alleviating environmental pressure. [0003] Crystalline silicon cell modules are the core terminal units of photovoltaic power generation, and their conversion efficiency and cost will greatly affect the economic benefits of photovoltaic power plants. Due to the mature production process and low manu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/02H01L31/0224H01L31/0216H01L31/05H01L31/054H01L31/048H01L31/18
CPCH01L31/02013H01L31/02167H01L31/022441H01L31/048H01L31/0516H01L31/054H01L31/1804Y02E10/52Y02E10/547Y02P70/50
Inventor 赵科雄
Owner ZHEJIANG LEYE PHOTOVOLTAIC TECH CO LTD
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