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Solar cell string, solar cell module and manufacturing method thereof

A technology for solar cells and cells, which is applied in the field of solar cells, can solve the problems of high cell stacking accuracy and high process difficulty, and achieve the effects of reducing back silver paste waste, increasing passivation area, and low material cost

Active Publication Date: 2020-07-31
CHANGCHUN YONGGU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this requires high precision for cell stacking, and the process is difficult

Method used

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  • Solar cell string, solar cell module and manufacturing method thereof
  • Solar cell string, solar cell module and manufacturing method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0116] According to the preparation method of the present invention, the sintering temperature of the front silver electrode is 750-1000°C; the sintering temperature of the aluminum back field is 450-650°C. Preferably, the sintering temperature of the front silver electrode is 800-950°C; the sintering temperature of the aluminum back field is 550-650°C.

[0117] In a specific embodiment, the sintering temperature of the front silver electrode is 850°C; the sintering temperature of the aluminum back field is 580°C. Of course, the simultaneous sintering of the front silver electrode and the aluminum back field can be realized after drying separately, and one sintering is completed.

[0118] In a specific embodiment, the method for preparing a solar cell string of the present invention, the method includes the following steps:

[0119] Carry out texturing, diffusion, etching and coating treatment on the crystalline silicon substrate in sequence;

[0120] Print aluminum paste on...

Embodiment 1

[0176] In this embodiment, epoxy resin-based conductive adhesive is used. Specifically, the epoxy resin is prepared according to the following method.

[0177] The components used to prepare the conductive adhesive are as follows:

[0178] 6 parts of epoxy resin DER-354 (Dow Chemical), 4 parts of epoxy resin DER-852 (Dow Chemical), 2 parts of curing agent diaminodiphenylsulfone (Nanjing Chemical Reagent Co., Ltd.), 1 part of diluent , 10 parts of 4-butanediol diglycidyl ether (Aladdin reagent), 75 parts of flake silver powder (METALOR), 2 parts of curing accelerator 1,1-dimethyl-3-phenylurea (Aladdin reagent) , 0.5 parts of conduction accelerator succinic acid (Aladdin reagent), 0.5 parts of coupling agent Z6040 (DOWCORNING), the sum of the above components is 100 parts.

[0179] The preparation method of conductive adhesive is as follows:

[0180] First mix the above epoxy resin with the above diluent and coupling agent evenly, then add the above curing agent, the above con...

Embodiment 2

[0188] Prepared according to the same method as Example 1, except that only 5 parts of epoxy resin DER-354 is used, no other epoxy resin is used, and the amount of 1,4-butanediol diglycidyl ether diluent is changed to 5 parts Part, 1 part of diaminodiphenyl sulfone curing agent, 1 part of 1,1-dimethyl-3-phenylurea curing accelerator is changed into 1 part, and flake silver powder is changed into 88 parts, according to the same as embodiment 1 The conductive adhesive was prepared in this way.

[0189] The crystalline silicon substrate was processed in the same manner as in Example 1, and what was used here was an N-type single-sided single-crystal cell (wherein the difference from Example 1 was only in the diffusion process, and powdered boron nitride Diffusion is carried out by pressing the tablet, the diffusion temperature is 950-1000°C, and the diffusion time is 15-30min), except that a rubber strip with a width of 2mm and a length of 120mm is coated on the aluminum back fie...

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Abstract

The invention relates to a solar battery string, comprising more than two cells serially connected in stack form, where each cell includes an aluminum back field, a back passivated layer, a polysilicon substrate, a positive passivated layer, an antireflective film, positive silver fingers and a positive silver electrode which are arranged sequentially from bottom to top; in two cells serially connected in stack manner, the positive silver electrode of the front cell is connected with the aluminum back field of the rear cell via conductive glue; in the cells serially connected in stack manner,a busbar is connected with the aluminum back field of the first cell via conductive glue, and a busbar is connected or directly welded to the positive silver electrode of the last cell via conductiveglue. The solar battery string herein has the advantages that the usage of back silver paste can be decreased, the silkscreen printing process is simplified, and the material cost is low; the back silver electrodes are omitted while the conducting capacity is equivalent to that of the string having the back silver electrodes; conductive connection is reliable and stable; the passivated area of thealuminum back field is enlarged, so that photon utilization efficiency is improved; in addition, the requirement on aligning precision of the stack process is lowered; gaps among the modules are utilized, and the cells that can be added under the same area are 13% and above more than those in conventional modules.

Description

technical field [0001] The invention belongs to the field of solar cells, and relates to a solar cell string, a solar cell module formed by the solar cell string, and a preparation method of the solar cell string. Background technique [0002] A solar cell is an energy conversion device that converts light energy into electrical energy. The working principle of a solar cell is based on the photovoltaic effect of a semiconductor P-N junction. Among them, crystalline silicon solar cells are the most widely used solar cells. [0003] Conventional crystalline silicon solar cells are made into cells containing P-N junctions through processes such as texturing, diffusion, etching, and coating, which generate potential differences under sunlight. In order to draw electric current, need make positive and negative two electrodes on P-N junction. The most common method for making electrodes is screen printing, which usually includes back silver printing, aluminum back field printing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/043H01L31/05H01L31/0224H01L31/18
CPCH01L31/022441H01L31/043H01L31/0512H01L31/0516H01L31/1804H01L31/188Y02E10/547
Inventor 郑岩王群刘姝李丹飞郑岚赵柏杨
Owner CHANGCHUN YONGGU TECH
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