JP6097483B2 - Crystalline solar cell module - Google Patents

Crystalline solar cell module Download PDF

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Publication number
JP6097483B2
JP6097483B2 JP2012047772A JP2012047772A JP6097483B2 JP 6097483 B2 JP6097483 B2 JP 6097483B2 JP 2012047772 A JP2012047772 A JP 2012047772A JP 2012047772 A JP2012047772 A JP 2012047772A JP 6097483 B2 JP6097483 B2 JP 6097483B2
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solar cell
crystalline solar
conductive adhesive
finger electrodes
connection region
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JP2013183117A (en
Inventor
秀昭 奥宮
秀昭 奥宮
須賀 保博
保博 須賀
明史 樋口
明史 樋口
貴啓 藤井
貴啓 藤井
大介 花井
大介 花井
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デクセリアルズ株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Description

  The present invention relates to a crystalline solar battery cell, a crystalline solar battery module, and a manufacturing method thereof.

  Solar cells are expected as new energy sources because they directly convert clean and inexhaustible sunlight into electricity.

The solar cell is used as a solar cell module in which a plurality of solar cells are connected via tab wires.
The conventional tab wire used the type which solder-coated on the copper wire surface. However, since a high temperature is required for solder connection, panel breakage and warpage of the light receiving surface, short-circuit due to solder protruding from the tab wire (leakage), etc. occurred, causing problems.
Therefore, a conductive adhesive has been used as a connection material instead of solder. Since such a conductive adhesive can be connected at a low temperature, it is possible to reduce the problem of warping or cracking of the solar battery cell.

  On the other hand, the said photovoltaic cell has a finger electrode and a bus-bar electrode for taking out the electrical energy normally obtained by converting sunlight energy. The finger electrode is an electrode that collects electricity generated in the solar battery cell. The bus bar electrode is an electrode that collects electricity from the finger electrode. In the solar cell module, the tab wire and the bus bar electrode are electrically connected. Therefore, electricity generated in the solar battery cell is collected by the tab line via the finger electrode and the bus bar electrode.

  Usually, the bus bar electrode is formed by applying a silver paste. However, since the cost of the solar cells can be reduced by reducing the silver paste, so-called bus bar-less solar cells and solar cell modules that do not use the bus bar electrodes have been developed in recent years. In particular, solar cell modules using the conductive adhesive for connecting the solar cells and the tab wires are attracting attention because they can be manufactured by efficiently connecting solar cells having a bus barless structure. .

  However, a solar cell module using a bus barless structure solar cell in which the tab wire and the finger electrode of the solar cell are electrically connected via the conductive adhesive, the solar cell module using the conductive adhesive In order to join the tab wire and the finger electrode, the conductive adhesion to the surface of the solar cell or the tab wire is caused by a step between the surface of the solar cell and the finger electrode formed in a convex shape on the surface. There is a problem in that voids are formed without the contact of the agent, and adhesive strength and connection reliability are lowered.

As a solar cell module using a solar cell having a bus bar-less structure, the thickness of the finger electrode in the connection portion between the tab wire (wiring material) having a conductive layer and the finger electrode (connection electrode) A solar cell module having a thickness smaller than the thickness has been proposed (see, for example, Patent Document 1). In one aspect of this proposed technique, a solar cell module is proposed in which the number of finger electrodes in the connection region where the solar cells and the tab wires are connected is greater than the number of finger electrodes in other regions ( For example, refer to FIG.
However, the proposed technique does not solve the above-described problem that the adhesive force and the connection reliability are reduced in a solar battery module using solar cells having a bus bar-less structure, particularly a crystalline solar battery module.

  Accordingly, there is a need to provide a crystalline solar cell having a bus barless structure excellent in adhesive strength and connection reliability, a crystalline solar cell module using the crystalline solar cell, and a method for producing the crystalline solar cell module. This is the current situation.

JP 2008-263163 A

  An object of the present invention is to solve the above-described problems and achieve the following objects. That is, the present invention relates to a crystalline solar cell having a bus barless structure excellent in adhesive strength and connection reliability, a crystalline solar cell module using the crystalline solar cell, and a method for producing the crystalline solar cell module. The purpose is to provide.

Means for solving the problems are as follows. That is,
<1> A crystalline solar cell module in which a tab wire and a finger electrode of a crystalline solar cell are electrically connected via a conductive adhesive,
The crystalline solar cell has a bus bar-less structure without a bus bar electrode,
The number of the finger electrodes in the longitudinal direction of the tab line in the connection region where the crystalline solar cell and the tab line are connected by the conductive adhesive is such that the crystalline solar cell and the tab line are It is a crystalline solar cell module, wherein the number is less than the number of the finger electrodes in the longitudinal direction of the tab wire in a non-connection region that is not connected by the conductive adhesive.
<2> The crystalline solar cell module according to <1>, wherein an average interval between the finger electrodes in the connection region is 1.5 mm or more.
<3> The crystalline solar cell module according to any one of <1> to <2>, wherein an average height of the finger electrodes is less than 80 μm.
<4> The crystalline solar cell module according to any one of <1> to <3>, wherein a tab line has a waveform shape.
<5> The crystalline solar cell module according to any one of <1> to <4>, wherein an average height of the finger electrodes is equal to or greater than an average thickness of the conductive adhesive before being used for electrical connection.
<6> A crystalline solar cell having a bus bar-less structure having a finger electrode and no bus bar electrode,
The number of the finger electrodes in the longitudinal direction of the tab wire in a connection region where the crystalline solar cell and the tab wire are connected by a conductive adhesive is such that the crystalline solar cell and the tab wire are electrically conductive. It is a crystalline solar cell characterized in that the number is less than the number of the finger electrodes in the longitudinal direction of the tab wire in the non-connection region that is not connected by the adhesive.
<7> Arrangement of disposing a tab line on the conductive adhesive subsequent to the application process of applying a conductive adhesive to the light receiving surface of the plurality of crystalline solar cells and the opposite surface of the light receiving surface By performing a heating and pressing process for heating and pressing the tab wire subsequent to the processing and the placement process, the finger electrode of the crystalline solar cell and the tab wire are electrically connected via the conductive adhesive. Strings producing step of producing a string in which the plurality of crystalline solar cells connected in series are connected in series, and
A covering step of covering the strings with a sealing resin, and further covering the sealing resin with either a moisture-proof backsheet or a glass plate;
A pressing step of pressing either the moisture-proof backsheet or the glass plate;
A heating step of heating the heating stage on which the strings are placed,
The crystalline solar cell has a bus bar-less structure without a bus bar electrode,
In the arrangement process, the number of the finger electrodes in the longitudinal direction of the tab wire is such that the crystalline solar cell and the tab wire are not connected by the conductive adhesive in the longitudinal direction of the tab wire. In the method for manufacturing a crystalline solar cell module, the tab wire is disposed in a connection region that is less than the number of the finger electrodes.

  According to the present invention, the above-described problems can be solved and the above-described object can be achieved, and a crystalline solar cell having a bus bar-less structure excellent in adhesive strength and connection reliability, and the crystalline solar cell are used. The crystalline solar cell module and the method for manufacturing the crystalline solar cell module can be provided.

FIG. 1 is a schematic top view showing an example of the crystalline solar cell of the present invention. FIG. 2 is a schematic top view showing another example of the crystalline solar battery cell of the present invention. FIG. 3: A is a schematic sectional drawing for demonstrating an example of the crystalline solar cell module of this invention (the 1). FIG. 3: B is a schematic sectional drawing for demonstrating an example of the crystalline solar cell module of this invention (the 2). FIG. 4 is an exploded perspective view showing an example of the crystalline solar cell module of the present invention. FIG. 5 is a schematic view showing an example of the crystalline solar cell module of the present invention. FIG. 6 is a schematic top view showing a crystalline solar cell model.

(Crystal solar cell)
The crystalline solar cell of the present invention has a crystalline photoelectric conversion element and a finger electrode as a photoelectric conversion part, and further includes other members as necessary.

The crystalline photoelectric conversion element is not particularly limited as long as it is a photoelectric conversion element having a crystalline photoelectric conversion material, and can be appropriately selected according to the purpose.
Examples of the crystalline photoelectric conversion material include single crystal compounds such as single crystal silicon, polycrystalline silicon, and GaAs, and polycrystalline compounds such as CdS and CdTe.

The crystalline solar cell has a bus bar-less structure having no bus bar electrode.
The crystalline solar battery cell may have an auxiliary electrode for electrically connecting the plurality of finger electrodes to each other in a direction orthogonal to the finger electrodes. The auxiliary electrode is different from the bus bar electrode.

<Finger electrode>
The finger electrode is an electrode that collects electricity generated in the photoelectric conversion unit. The finger electrode is formed on the crystalline solar cell in a direction substantially orthogonal to a tab line to be connected later with a conductive adhesive.

  There is no restriction | limiting in particular as a material of the said finger electrode, According to the objective, it can select suitably, For example, silver, gold | metal | money, copper, tin, nickel, aluminum etc. are mentioned.

There is no restriction | limiting in particular as an average width | variety of the said finger electrode, Although it can select suitably according to the objective, 20 micrometers-200 micrometers are preferable, and 50 micrometers-150 micrometers are more preferable.
The average width can be obtained, for example, by measuring the width of the finger electrode at any 10 points of the finger electrode and averaging the measured values.

The number of the finger electrodes in the longitudinal direction of the tab line in the connection region where the crystalline solar cell and the tab line are connected by the conductive adhesive is such that the crystalline solar cell and the tab line are The number is less than the number of the finger electrodes in the longitudinal direction of the tab wire in the non-connection region that is not connected by the conductive adhesive. In other words, the average interval between the finger electrodes in the connection region is longer than the average interval between the finger electrodes in the non-connection region.
By doing so, the conductive adhesive does not contact the surface of the crystalline solar cell by the step between the surface of the crystalline solar cell and the finger electrode formed in a convex shape on the surface, It is possible to solve the problem that voids are formed, the adhesive strength and connection reliability are lowered, and a crystalline solar cell module having excellent connection reliability can be obtained.

There is no restriction | limiting in particular as an average space | interval of the said finger electrode in the said connection area | region, Although it can select suitably according to the objective, 1.5 mm or more is preferable, 1.5 mm-3.5 mm are more preferable, 2 Particularly preferred is 5 mm to 3.5 mm. When the average interval is within the particularly preferable range, it is advantageous in that the peel strength is excellent.
The average interval can be obtained, for example, by measuring the distance between the centers in the width direction of adjacent finger electrodes at any ten locations in the connection region and averaging the measured values.

As an average interval of the finger electrodes in the non-connection region, the number of the finger electrodes in the longitudinal direction of the tab line in the connection region is equal to the number of the finger electrodes in the longitudinal direction of the tab line in the non-connection region. As long as it is less than the number of, it is not particularly limited and can be appropriately selected according to the purpose, but it is preferably 0.5 mm or more, more preferably 0.5 mm to 2.5 mm. When the average interval is within the more preferable range, it is advantageous in terms of photoelectric conversion efficiency.
The average interval can be obtained, for example, by measuring the distance between the centers of adjacent finger electrodes in the width direction at any ten locations in the non-connection region and averaging the measured values.

There is no restriction | limiting in particular as average height of the said finger electrode, Although it can select suitably according to the objective, Less than 80 micrometers is preferable, 15 micrometers-65 micrometers are more preferable, 20 micrometers-60 micrometers are especially preferable.
When the average height of the finger electrodes is within the more preferable range and the average interval of the finger electrodes in the connection region is within the particularly preferable range, it is advantageous in terms of excellent peel strength. is there.
The average height can be obtained, for example, by measuring the height of the finger electrode at any 10 points of the finger electrode and averaging the measured values.

  The finger electrode has a finger electrode in the connection region and a finger electrode in the non-connection region due to a difference in the number of the finger electrodes in the connection region and the non-connection region in a direction substantially orthogonal to the longitudinal direction thereof. There may be provided an auxiliary electrode for preventing disconnection of the electrical connection. The auxiliary electrode may be provided at a boundary portion between the connection region and the non-connection region, or may be provided at another position.

  There is no restriction | limiting in particular as a formation method of the said finger electrode, According to the objective, it can select suitably, For example, silver paste is used for the said crystalline solar cell so that the said finger electrode may become a desired pattern shape. It can be formed by printing on top. Examples of the printing method include screen printing.

  There is no restriction | limiting in particular as average thickness of the said crystalline solar cell, According to the objective, it can select suitably.

  Here, the said crystalline solar cell is demonstrated using a figure. FIG. 1 is a schematic top view showing an example of the crystalline solar cell of the present invention. A crystalline solar cell 2 shown in FIG. 1 is a bus-barless crystalline solar cell, and has a structure in which finger electrodes 12 are formed on a crystalline photoelectric conversion element. The number of finger electrodes 12 is different between the connection region 21 and the non-connection region 22. In the crystalline solar cell 2 shown in FIG. 1, the number of finger electrodes 12 in the connection region 21 is ½ times the number of finger electrodes 12 in the non-connection region 22. In other words, the average interval of the finger electrodes 12 in the connection region 21 is 2.0 times the average interval of the finger electrodes 12 in the non-connection region 22. In FIG. 1, the finger electrode 12 is formed at the boundary between the connection region 21 and the non-connection region 22 in the direction perpendicular to the longitudinal direction of the finger electrode in the connection region 21 and the non-connection region 22. The auxiliary electrode 23 is provided to prevent disconnection of electrical connection due to the difference in number. The auxiliary electrode 23 is disposed so as to electrically connect all the finger electrodes.

  FIG. 2 is a schematic top view showing another example of the crystalline solar battery cell of the present invention. A crystalline solar cell 2 shown in FIG. 2 is a bus-barless crystalline solar cell, and has a structure in which finger electrodes 12 are formed on a crystalline photoelectric conversion element. The number of finger electrodes 12 is different between the connection region 21 and the non-connection region 22. In the crystalline solar cell 2 shown in FIG. 2, the number of finger electrodes 12 in the connection region 21 is ½ times the number of finger electrodes 12 in the non-connection region 22. In other words, the average interval of the finger electrodes 12 in the connection region 21 is 2.0 times the average interval of the finger electrodes 12 in the non-connection region 22. In FIG. 2, at the boundary portion between the connection region 21 and the non-connection region 22, the finger electrode 12 extends in the direction perpendicular to the longitudinal direction of the finger electrode in the connection region 21 and the non-connection region 22. The auxiliary electrode 23 is provided to prevent disconnection of electrical connection due to the difference in number. The auxiliary electrode 23 is disposed so as to electrically connect the two finger electrodes 12 in the non-connection region 22 and the one finger electrode 12 in the connection region 21.

  As shown in FIGS. 1 and 2, the crystalline solar cell has a wider interval in the connection region 21 than in the non-connection region 22, and therefore, a region having a relatively large number of finger electrodes has a greater number of finger electrodes. The structure has a narrower interval than a region with a relatively small number.

  The crystalline solar battery cell can be suitably used for a crystalline solar battery module of the present invention described later.

(Crystal solar module)
The crystalline solar cell module of the present invention has at least a crystalline solar cell, a tab wire, and a conductive adhesive, and if necessary, a sealing resin, a moisture-proof backsheet, a glass plate, and the like. It has other members.
The crystalline solar cell module is a crystalline solar cell module in which the tab wire and the finger electrode of the crystalline solar cell are electrically connected via the conductive adhesive.
The number of the finger electrodes in the longitudinal direction of the tab line in the connection region where the crystalline solar cell and the tab line are connected by the conductive adhesive is such that the crystalline solar cell and the tab line are The number is less than the number of the finger electrodes in the longitudinal direction of the tab wire in the non-connection region that is not connected by the conductive adhesive.

<Crystal solar cell>
As the crystalline solar cell, the crystalline solar cell of the present invention is preferable.

<Tab line>
The tab line is not particularly limited as long as it is a line that electrically connects adjacent crystal solar cells, and can be appropriately selected according to the purpose.

The material of the tab wire is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include copper, aluminum, iron, gold, silver, nickel, palladium, chromium, molybdenum, and alloys thereof. Can be mentioned. Moreover, gold plating, silver plating, tin plating, solder plating, etc. may be given to these metals as needed.
There is no restriction | limiting in particular as a shape of the said tab wire, According to the objective, it can select suitably, For example, ribbon shape etc. are mentioned.
There is no restriction | limiting in particular as an average width | variety of the said tab wire, Although it can select suitably according to the objective, 1 mm-6 mm are preferable and 1 mm-3 mm are more preferable.
There is no restriction | limiting in particular as average thickness of the said tab wire, Although it can select suitably according to the objective, 50 micrometers-400 micrometers are preferable, and 150-250 micrometers are more preferable.

  There is no restriction | limiting in particular as a preparation method of the said tab wire, According to the objective, it can select suitably, For example, slitting copper foil, aluminum foil, etc. which were rolled by average thickness of 50 micrometers-400 micrometers, average width of 1 mm- Examples thereof include a method of 6 mm, a method of rolling a thin metal wire such as copper and aluminum into a flat plate shape to obtain an average width of 1 mm to 6 mm and an average thickness of 50 μm to 400 μm.

It is preferable that the tab wire has a corrugated shape after crimping in a cross section orthogonal to the light receiving surface of the crystalline solar cell.
In the crystalline solar cell module, the number of finger electrodes in the connection region is smaller than the number of finger electrodes in the non-connection region, so that the tab line can have the waveform shape. As a result, the adhesive force can be improved and the connection reliability can be improved.
Here, an example of the crystalline solar cell module in which the tab line has a waveform shape is shown. 3A and 3B are schematic cross-sectional views for explaining an example of the crystalline solar cell module of the present invention. In FIG. 3A, a conductive adhesive film 17 that is a conductive adhesive is temporarily attached to the crystalline solar battery cell 2 on which the finger electrodes 12 are arranged. The tab wire 3 is disposed on the conductive adhesive film 17. Then, by heating and pressing the tab wire 3 with the heating tool 21 through the buffer material 20, the tab wire 3 and the finger electrode 12 are connected through the conductive adhesive film 17 as shown in FIG. 3B. Is done. At this time, since the number of finger electrodes in the connection region is small, the tab line 3 has a waveform shape in FIG. 3B. By doing so, even if the height of the finger electrode 3 is equal to or greater than the thickness of the conductive adhesive film 17, the adhesive force and the connection reliability can be improved.

<Conductive adhesive>
The conductive adhesive is not particularly limited and may be appropriately selected depending on the purpose. For example, the conductive adhesive contains at least conductive particles, and preferably includes a film-forming resin, a curable resin, and a curing agent. A conductive adhesive containing other components as necessary is also included.
The conductive adhesive may be in the form of a film or a paste.

-Conductive particles-
The conductive particles are not particularly limited and may be appropriately selected depending on the purpose. For example, nickel particles, gold-coated nickel particles, resin particles with a resin core coated with Ni, and resin cores with Ni coated. Furthermore, resin particles whose outermost surface is coated with Au can be mentioned.

-Film forming resin-
There is no restriction | limiting in particular as said film formation resin, According to the objective, it can select suitably, For example, phenoxy resin, unsaturated polyester resin, saturated polyester resin, urethane resin, butadiene resin, polyimide resin, polyamide resin, polyolefin Resin etc. are mentioned. These may be used individually by 1 type and may use 2 or more types together. Among these, phenoxy resin is particularly preferable.

-Curable resin-
There is no restriction | limiting in particular as said curable resin, According to the objective, it can select suitably, For example, an epoxy resin, an acrylate resin, etc. are mentioned.

--- Epoxy resin--
There is no restriction | limiting in particular as said epoxy resin, According to the objective, it can select suitably, For example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolak type epoxy resin, those modified epoxy resins, alicyclic type An epoxy resin etc. are mentioned. These may be used individually by 1 type and may use 2 or more types together.

-Acrylate resin-
The acrylate resin is not particularly limited and can be appropriately selected depending on the purpose. For example, methyl acrylate, ethyl acrylate, isopropyl acrylate, isobutyl acrylate, epoxy acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, trimethylol Propane triacrylate, dimethylol tricyclodecane diacrylate, tetramethylene glycol tetraacrylate, 2-hydroxy-1,3-diaacryloxypropane, 2,2-bis [4- (acryloxymethoxy) phenyl] propane, 2, 2-bis [4- (acryloxyethoxy) phenyl] propane, dicyclopentenyl acrylate, tricyclodecanyl acrylate, tris (acryloxyethyl) i Cyanurates, such as urethane acrylate, and the like. These may be used individually by 1 type and may use 2 or more types together.
Moreover, what made the said acrylate into the methacrylate is mentioned, These may be used individually by 1 type and may use 2 or more types together.

-Curing agent-
The curable resin is preferably used in combination with a curing agent. There is no restriction | limiting in particular as said hardening | curing agent, According to the objective, it can select suitably, For example, imidazole represented by 2-ethyl 4-methylimidazole; Lauroyl peroxide, butyl peroxide, benzyl peroxide, Organic peroxides such as dilauroyl peroxide, dibutyl peroxide, benzyl peroxide, peroxydicarbonate and benzoyl peroxide; anionic curing agents such as organic amines; cations such as sulfonium salts, onium salts and aluminum chelators System curing agents and the like.
Among these, a combination of an epoxy resin and an imidazole latent curing agent, and a combination of an acrylate resin and an organic peroxide curing agent are particularly preferable.

-Other ingredients-
There is no restriction | limiting in particular as said other component, According to the objective, it can select suitably, For example, a silane coupling agent, a filler, a softener, an accelerator, anti-aging agent, a coloring agent (pigment, dye) , Organic solvents, ion catcher agents and the like. The addition amount of the other components is not particularly limited and can be appropriately selected depending on the purpose.

There is no restriction | limiting in particular as average thickness of the said conductive adhesive before using for an electrical connection, Although it can select suitably according to the objective, 3 micrometers-100 micrometers are preferable, 5 micrometers-30 micrometers are more preferable, 8 micrometers- 25 μm is particularly preferable.
In general, from the viewpoint of peel strength, the average thickness of the conductive adhesive is preferably equal to or higher than the average height of the finger electrodes. However, in the crystalline solar cell module of the present invention, the conductive The average thickness of the conductive adhesive is smaller than the average height of the finger electrodes, in other words, even if the average height of the finger electrodes is equal to or greater than the average thickness of the conductive adhesive, the shape of the tab wire is corrugated. By taking a sufficient peel strength can be obtained. And it is preferable from the point of cost that the average thickness of the said conductive adhesive is smaller than the average height of the said finger electrode.
Here, the said average thickness is an average value at the time of measuring five places arbitrarily per 20 cm < 2 >.

<Resin for sealing>
The sealing resin is not particularly limited and may be appropriately selected depending on the purpose. For example, ethylene / vinyl acetate copolymer (EVA), ethylene / vinyl acetate / triallyl isocyanurate (EVAT), Examples include polyvinyl butyrate (PVB), polyisobutylene (PIB), silicone resin, polyurethane resin, and the like.

<Dampproof back sheet>
There is no restriction | limiting in particular as said moisture-proof backsheet, According to the objective, it can select suitably, For example, the laminated body of polyethylene terephthalate (PET), aluminum (Al), PET, Al, and polyethylene (PE) etc. Can be mentioned.

<Glass plate>
There is no restriction | limiting in particular as said glass plate, According to the objective, it can select suitably, For example, a soda-lime float glass plate etc. are mentioned.

  There is no restriction | limiting in particular as a manufacturing method of the said crystalline solar cell module, Although it can select suitably according to the objective, The manufacturing method of the crystalline solar cell module of this invention mentioned later is preferable.

An example of the crystalline solar cell module of the present invention will be described with reference to the drawings.
FIG. 4 is an exploded perspective view showing an example of the crystalline solar cell module of the present invention. The crystalline solar cell module 1 includes strings 4 in which a plurality of crystalline solar cells 2 are connected in series by tab wires 3 serving as interconnectors, and includes a matrix 5 in which a plurality of the strings 4 are arranged. In the crystalline solar cell module 1, the matrix 5 is sandwiched between sealing resin sheets 6, and together with a front cover 7 provided on the light receiving surface side and a moisture-proof back sheet 8 provided on the back surface side. Finally, a metal frame 9 such as aluminum is attached to the periphery.

  Moreover, as shown in FIG. 5, each crystalline solar cell 2 of the crystalline solar cell module has a crystalline photoelectric conversion element 10 made of a silicon substrate. On the light receiving surface side of the crystalline photoelectric conversion element 10, finger electrodes 12 are provided in a direction orthogonal to the tab wire 3. The crystalline photoelectric conversion element 10 is provided with an Al back electrode 13 made of aluminum on the back side opposite to the light receiving surface.

  In the crystalline solar cell 2, the finger electrode 12 on the surface and the Al back electrode 13 of the adjacent crystalline solar cell 2 are electrically connected by the tab wire 3, and thus connected in series. Constructs a string. The connection between the tab wire 3 and the finger electrode 12 and the connection between the tab wire 3 and the Al back electrode 13 are performed by a conductive adhesive film 17 made of a conductive adhesive.

(Method for producing crystalline solar cell module)
The manufacturing method of the crystalline solar cell module of the present invention includes at least a strings manufacturing step, a covering step, a pressing step, and a heating step, and further includes other steps as necessary.
The manufacturing method of the crystalline solar cell module of the present invention can be suitably used for manufacturing the crystalline solar cell module of the present invention.

<Strings production process>
The string manufacturing step includes at least an application process, an arrangement process, and a heat pressing process, and further includes other processes as necessary.

-Granting process-
The application process is not particularly limited as long as it is a process of applying a conductive adhesive to the light receiving surfaces of a plurality of crystalline solar cells and the opposite surface of the light receiving surface, and can be appropriately selected according to the purpose. it can.
The conductive adhesive may be in the form of a film or a paste. In the case where the conductive adhesive is in the form of a film, the application treatment includes, for example, temporarily sticking the film-like conductive adhesive. In the case where the conductive adhesive is in a paste form, the application treatment includes, for example, applying the paste-like conductive adhesive. There is no restriction | limiting in particular as a coating method, According to the objective, it can select suitably.
In the application process, the conductive adhesive is applied to a predetermined position where the tab wire is disposed.

-Crystalline solar cells
As the crystalline solar cell, for example, the crystalline solar cell of the present invention is preferable. That is, the crystalline solar cell has a bus bar-less structure without a bus bar electrode, and the length of the tab line in the connection region where the crystalline solar cell and the tab line are connected by the conductive adhesive. The number of the finger electrodes in the direction is smaller than the number of the finger electrodes in the longitudinal direction of the tab line in a non-connection region where the crystalline solar cell and the tab line are not connected by the conductive adhesive.

--Conductive adhesive--
There is no restriction | limiting in particular as said conductive adhesive, According to the objective, it can select suitably.
As said conductive adhesive, the said conductive adhesive demonstrated in the said crystalline solar cell module of this invention is mentioned, for example.

There is no restriction | limiting in particular as average thickness of the said electrically conductive adhesive, Although it can select suitably according to the objective, 3 micrometers-100 micrometers are preferable, 5 micrometers-30 micrometers are more preferable, 8 micrometers-25 micrometers are especially preferable. When the average thickness is less than 3 μm, the adhesive strength may be remarkably lowered. When the average thickness is more than 100 μm, the conductive adhesive may protrude from the tab wire and a problem may occur in electrical connection. It is advantageous in terms of connection reliability that the average thickness is within the particularly preferable range. The average thickness is an average thickness measured before the temporary attachment.
Here, the said average thickness is an average value at the time of measuring five places arbitrarily per 20 cm < 2 >.

  There is no restriction | limiting in particular as an average width | variety of the said conductive adhesive, Although it can select suitably according to the objective, It is 1 mm-6 mm, and is the same width as the said tab wire, or less than the width of the said tab wire. Preferably there is.

-Placement process-
The arrangement process is not particularly limited as long as it is a process of arranging tab lines on the conductive adhesive following the application process, and can be appropriately selected according to the purpose.
In the arrangement process, the number of the finger electrodes in the longitudinal direction of the tab line is such that the length of the tab line in a non-connection region where the crystalline solar cell and the tab line are not connected by the conductive adhesive. The tab line is arranged in a connection region that is less than the number of finger electrodes in the direction.
Further, during the arrangement process, between the adjacent crystalline solar cells, a part of one tab line is arranged on the light receiving surface of one crystalline solar cell, and the other of the tab lines A part is disposed on the opposite surface of the light receiving surface of the other crystalline solar cell.

-Tab line-
As said tab wire, the thing similar to the said tab wire demonstrated in the said crystalline solar cell module of this invention is mentioned, for example.

-Heat pressing treatment-
The heating and pressing process is not particularly limited as long as it is a process for heating and pressing the tab wire subsequent to the arrangement process, and can be appropriately selected according to the purpose. it can.
There is no restriction | limiting in particular as the heating time, heating temperature, and pressure in the said heat press process, According to the objective, it can select suitably.

  Through the above string manufacturing process, the finger electrode of the crystalline solar cell and the tab wire are electrically connected via the conductive adhesive, and the plurality of crystalline solar cells are connected in series. Strings are produced.

<Coating process>
The covering step is not particularly limited as long as it is a step of covering the strings with a sealing resin, and further covering the sealing resin with either a moisture-proof backsheet or a glass plate, and may be appropriately performed according to the purpose. You can choose.

  The method for producing the crystalline solar cell module as described above is preferably performed using a reduced pressure laminator.

  The sealing resin, the moisture-proof backsheet, and the glass plate are not particularly limited and may be appropriately selected depending on the purpose. For example, the examples are given in the description of the crystalline solar cell module of the present invention. Examples of the sealing resin, the moisture-proof backsheet, and the glass plate.

<Pressing step and heating step>
The pressing step is not particularly limited as long as it is a step of pressing either the moisture-proof backsheet or the glass plate, and can be appropriately selected according to the purpose. The pressure to press and the time to press are arbitrary.

  The heating step is not particularly limited as long as it is a step of heating the heating stage on which the strings are placed, and can be appropriately selected according to the purpose. The sealing resin can be heated by heating the heating stage.

  There is no restriction | limiting in particular as heating temperature in the said heating process, Although it can select suitably according to the objective, 50 to 250 degreeC is preferable and 100 to 200 degreeC is more preferable. When the heating temperature is less than 50 ° C., sealing may be insufficient. When the heating temperature exceeds 250 ° C., an organic resin such as a conductive adhesive or a sealing resin may be thermally decomposed. When the heating temperature is within the particularly preferable range, it is advantageous in terms of sealing reliability.

  There is no restriction | limiting in particular as the heating time in the said heating process, Although it can select suitably according to the objective, 1 second-1 hour are preferable, 5 seconds-30 minutes are more preferable, and 10 seconds-20 minutes are especially. preferable. If the heating time is less than 1 second, sealing may be insufficient. When the heating time is within the particularly preferable range, it is advantageous in terms of sealing reliability.

  There is no restriction | limiting in particular as an order which starts the said press process and the said heating process, According to the objective, it can select suitably.

By doing so, the strings in which a plurality of crystalline solar cells are connected by tab wires, and the crystalline solar cell module of the present invention in which the strings are sealed are manufactured.
For example, the crystalline solar cell module of the present invention can be manufactured by forming a matrix in which a plurality of strings are arranged and sealing the matrix.

  Moreover, you may electrically connect a crystalline solar cell and a tab wire in the case of sealing. This method can be performed with reference to the method described in JP 2010-283059 A, for example.

Examples of the present invention will be described below, but the present invention is not limited to these examples.
In the following examples, Example 1 is read as Reference Example 1.

Example 1
<Production of crystalline solar cell module model>
-Tab line-
As a tab wire, a copper foil with a solder layer in which a solder layer (average thickness 40 μm) of lead-free solder was formed on one surface of a copper foil (average thickness 150 μm) was prepared. The copper foil with a solder layer was slit into a width of 1.0 mm.

-Conductive adhesive film-
A conductive adhesive film (SP100 series, average thickness 25 μm, manufactured by Sony Chemical & Information Device Corporation) was prepared. The conductive adhesive film was slit into a width of 1.0 mm.

-Production of crystalline solar cell model-
As a crystalline solar cell model 2 ′, a glass substrate on which a pattern by finger electrodes 12 as shown in FIG. 6 was formed was produced. A finger paste 12 pattern as shown in FIG. 6 was formed by screen printing a silver paste on a glass substrate (length 64 mm × width 64 mm × thickness 2.8 mm). The interval b between the finger electrodes 12 in the connection region 21 is 2.0 mm (average value is also 2.0 mm), and the interval a between the finger electrodes 12 in the non-connection region 22 is 1.0 mm (average value is also 1.0 mm). . The number of finger electrodes in the connection region 21 was 28, and the number of finger electrodes in the non-connection region 22 was 55. The average height of the finger electrodes 12 was 70 μm, and the average width was 100 μm.
Here, the average height of the finger electrode was obtained by measuring the height of the finger electrode with an length measuring device at any 10 points and averaging it.
Here, the average width of the finger electrode was obtained by measuring the width of the finger electrode with a length measuring device at an arbitrary 10 points and averaging it.

-Fabrication of crystalline solar cell model with tab wire-
A conductive adhesive film was temporarily pasted on the finger electrode 12 in the connection region 21 of the crystalline solar cell model 2 ′. The temporary bonding conditions were a heating temperature of 70 ° C., a pressure of 0.5 MPa, and 1 second, and were performed using a heating tool.
Subsequently, a tab wire is placed on the conductive adhesive film, and the tab wire is heated with a heating tool through a silicon rubber cushioning material (200 μm) at a pressing force of 2 MPa, a heating temperature of 180 ° C. for 15 seconds. By pressing, the finger electrode and the tab wire were electrically connected via a conductive adhesive film. As described above, a tabular crystalline solar cell model was obtained.

-Production of crystalline solar cell module model-
The obtained tabular crystalline solar cell model with tab wires was covered with a sealing resin, and the sealing resin was further covered with a moisture-proof backsheet. As the sealing resin, an ethylene / vinyl acetate copolymer having a thickness of 500 μm was used. A PET film was used for the back sheet.
Then, the sealing resin was sealed with a laminator. Specifically, vacuuming was performed at 100 ° C. for 5 minutes, followed by laminating at a press time of 5 minutes and 0.1 MPa, and then curing in an oven at 155 ° C. for 45 minutes.
Thus, a crystalline solar cell module model was obtained.

<Evaluation>
The crystalline solar cell model with tab wire and the crystalline solar cell module model obtained above were subjected to the following evaluation. The results are shown in Table 1.

-Peel strength-
The peel strength was evaluated using a crystalline solar cell model with a tab line.
The peel strength (N / mm) was measured by performing a 90 ° peel test (JIS K6854-1) in which the tab line on the light receiving surface is peeled from the crystalline solar cell model in the 90 ° direction. Measurement was performed at a tensile speed of 50 cm / min using a peel strength tester (Tensilon, manufactured by Orientec Corporation).
[Criteria]
○: Peel strength is 1.0 N / mm or more Δ: Peel strength is more than 0.5 N / mm and less than 1.0 N / mm ×: Peel strength is 0.5 N / mm or less

-Connection reliability-
Connection reliability was evaluated using a crystalline solar cell module model.
The resistance value between two tab lines on the light receiving surface of the obtained crystalline solar cell module model was measured.
The resistance value after initial and TCT (thermal cycle test, 400 cycles between −40 ° C. and 85 ° C.) was measured using a digital multimeter (Yokogawa Electric Co., Ltd., Digital Meltimeter 7555), and TCT test The subsequent increase in resistance value (ΔR) was evaluated as connection reliability according to the following evaluation criteria.
[ΔR evaluation criteria]
◎: Less than 1.5 mΩ ○: 1.5 mΩ or more and less than 2.0 mΩ △: 2.0 mΩ or more and less than 3.0 mΩ ×: 3.0 mΩ or more

(Examples 2 to 5 and Comparative Example 1)
In Example 1, the average interval between the finger electrodes in the connection region and the average height of the finger electrodes were set as shown in Table 1 while the average interval between the finger electrodes in the non-connection region was 1.0 mm. A tabular crystalline solar cell model and a crystalline solar cell module model were prepared and subjected to evaluation in the same manner as in Example 1 except that the average distance between the electrodes and the average height of the finger electrodes were set. The number of finger electrodes was changed as appropriate.

In Example 1 in which the average height of the finger electrodes was 70 μm, the peel strength slightly decreased because the tab wire was slightly insufficient to follow the finger electrodes (deformation into the waveform).
When the average distance between the finger electrodes in the connection region is set to 3.0 mm (Example 3), the tab wire follows the finger electrode (corresponding to the waveform shape) as compared to the case of 2.0 mm (Example 2). Peel strength was improved due to improved deformation.
In Comparative Example 1, the number of finger electrodes in the connection region is the same as the number of finger electrodes in the non-connection region, that is, the average interval of the finger electrodes in the connection region is the same as the average interval of the finger electrodes in the non-connection region. Since the follow-up to the finger electrode (deformation into a waveform shape) was poor, the peel strength was insufficient as compared with Examples 1-5.

  The crystalline solar cell of the present invention can be suitably used for the crystalline solar cell module of the present invention because it can produce a crystalline solar cell module having excellent adhesive strength and connection reliability.

DESCRIPTION OF SYMBOLS 1 Crystalline solar cell module 2 Crystalline solar cell 3 Tab wire 17 Conductive adhesive film 12 Finger electrode 21 Connection area 22 Non-connection area

Claims (2)

  1. A crystalline solar cell module in which the tab wire and the finger electrode of the crystalline solar cell are electrically connected via a conductive adhesive containing conductive particles,
    The crystalline solar cell has a bus bar-less structure without a bus bar electrode,
    The number of the finger electrodes in the longitudinal direction of the tab line in the connection region where the crystalline solar cell and the tab line are connected by the conductive adhesive is such that the crystalline solar cell and the tab line are the rather less than the number of the finger electrodes in the longitudinal direction of the tab wire in the non-connection region not bonded with a conductive adhesive,
    The shape of the tab line is a waveform shape,
    The average distance between the finger electrodes in the connection region is 1.5 mm or more and 3.5 mm or less,
    The crystal-type solar cell module, wherein an average height of the finger electrodes is 15 μm to 65 μm .
  2. The crystalline solar cell module according to claim 1, wherein the average height of the finger electrodes is equal to or greater than the average thickness of the conductive adhesive before being used for electrical connection.
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