CN210110792U

CN210110792U - Novel flexible solar cell module

Info

Publication number: CN210110792U
Application number: CN201921391834.4U
Authority: CN
Inventors: 梁斐珂; 陈培专; 李劼; 魏昌华; 高翔
Original assignee: Mianyang Jinneng Mobile Energy Co Ltd
Current assignee: Mianyang Haohua Photoelectric Technology Co ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-02-21
Anticipated expiration: 2029-08-26

Abstract

The utility model discloses a novel flexible solar cell module, which comprises a plurality of flexible solar cell chips; the upper surface of each flexible solar cell chip is configured as a negative electrode, and the lower surface is configured as a positive electrode; and the positive electrodes and the negative electrodes of the adjacent battery chips are communicated and connected in series by adopting lap joint and through the matched conductive adhesive layers between the adjacent flexible solar battery chips, so that the flexible solar battery component is formed. The utility model provides a novel flexible solar module, it can set up the transparent conductive film among the solar module to battery chip's negative electrode innovatively, configures flexible conductive substrate into battery chip's positive electrode, so need not to do the extra processing of positive electrode, negative electrode to each battery chip and handle, and conductive adhesive layer combines together with the lapped mode simultaneously, obtains one kind and does not have the grid line, exempts from to weld, the big flexible solar module of area of contact.

Description

Novel flexible solar cell module

Technical Field

The utility model relates to a clean energy field. More specifically, the utility model relates to a be used in novel flexible solar module under the solar photovoltaic conversion utilization condition.

Background

At present, the flexible solar cell is widely applied to the field of mobile products such as solar cell backpacks, solar charging paper, solar umbrellas, outdoor positioning power supply systems, ocean monitoring power supply systems and the like due to the characteristics of light weight, softness, flexibility, thin battery and the like.

With the improvement of the application requirements of the mobile field, for example, the solar cell on a small area needs to provide higher voltage and certain current, so that more effective areas need to be used for generating electricity as much as possible, and the flexible solar cell has the advantage of flexible and variable specifications, so that the flexible solar cell is very suitable for being applied to the application requirements of the mobile field which are continuously changed.

However, the grid lines and the series connection mode of the flexible solar cell limit the application of the flexible solar cell, for example, although the following prior arts improve the technical problems, the disadvantages are still obvious:

as shown in fig. 1, patent CN 107134500 a requires to prepare a positive electrode 2 and a back electrode 3 on the surface of a solar cell 1, and the positive electrode 2 and the back electrode 3 are connected by a conductive silver adhesive 4, and the width of the positive electrode 2 and the width of the back electrode 3 limit the minimum application size of the solar cell, and meanwhile, the positive electrode and the back electrode are separately processed, so that the processing method is more complicated, the processing efficiency is low, and the overall thickness of the stacked multiple pieces is increased, which is not favorable for the miniaturization requirement of the package.

As shown in fig. 2, in patent CN 207474474U, a gate line 6 and a contact electrode 7 are prepared on the surface of a flexible solar cell 5, and the cells are connected in series in a lamination manner, which is limited by the preparation process of the gate line, the gate line pitch, and the electrode width, the preparation process of the flexible solar cell is complicated, the minimum size of the flexible solar cell cannot be smaller than the minimum gate line pitch and the electrode width, and the minimum application size of the solar cell is limited; the edge is not insulated, when the battery piece overlaps and has the skew or take place the certain degree crooked in the product use, the lower surface of last battery piece arouses the short circuit with the lower surface contact of next battery piece easily, reduces the product yield or causes the product inefficacy, brings the loss for enterprise and user, and adopts the mode of grid line, needs 2 times at whole course of working encapsulation, and technology is numerous and diverse, is unfavorable for improving production efficiency.

As shown in fig. 3, patent CN 108520908A discloses that top electrodes 9 are prepared in solar cells 8, and the cells are connected in series, and limited by the transmittance of the front plate 10 of the top electrode, light reaching the surface of the solar cell is attenuated during secondary packaging, and the current of the solar cell is reduced; the minimum application size of the solar cell is limited by the distance between the top electrode grid lines; the grid line is limited by the fine grid line of the top electrode, and when the small-area product is manufactured and the fine grid line is bent to a certain degree in the packaging process or the product using process, the fine grid line is easily separated from the contact electrode to cause open circuit, the product yield is reduced or the product is caused to lose efficacy, and losses are brought to enterprises and users.

As shown in fig. 4, CN 104412357B laser-welds solar cells 11 in series in a U-shaped region 13 of a front plate 12, and is limited by a U-shaped scribing process of the laser-welded region, where the U-shaped region is a dead region, which cannot generate power, reduces an effective power generation area, and reduces power generation power of the whole region; the light reaching the surface of the solar cell is weakened when the secondary packaging is carried out due to the limitation of the transmittance of the front plate, so that the current of the solar cell is reduced; limited by the grid line spacing, the minimum application size of the solar cell is limited.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages which will be described later.

The utility model discloses it is also an object to provide a novel flexible solar module, it can set up the transparent conductive film among the solar module to the negative electrode of battery chip innovatively, configure flexible conductive substrate into battery chip's positive electrode, the event need not to do the positive electrode to each battery chip, the extra processing of negative electrode is handled, make its whole height after the stack controllable, processing technology is simple, the product yield is controllable, simultaneously conductive adhesive layer combines together with the lapped mode, obtain a flexible solar module who does not have the grid line, exempt from to weld, area of contact is big, edge insulation handles.

To achieve these objects and other advantages in accordance with the purpose of the invention, a novel flexible solar cell module is provided, including a plurality of flexible solar cell chips;

the upper surface of each flexible solar cell chip is configured to adopt a transparent conductive film, and the lower surface of each flexible solar cell chip is configured to be a flexible conductive substrate;

the transparent conductive film is configured as a negative electrode of each flexible solar cell chip, and the flexible conductive substrate is configured as a positive electrode of each flexible solar cell chip;

and the positive electrodes and the negative electrodes of the adjacent battery chips are communicated and connected in series by adopting lap joint and through the matched conductive adhesive layers between the adjacent flexible solar battery chips, so that the flexible solar battery component is formed.

Preferably, a rectangular or U-shaped insulating medium layer is arranged at the edge of each flexible solar cell chip matched with the conductive adhesive layer;

wherein the insulating medium layer is configured to be obtained by adopting insulating ink or an insulating adhesive film.

Preferably, the insulating medium layer is aligned with the outer edge of each flexible solar cell chip, the width of the insulating medium layer is less than 20mm, and the thickness of the insulating medium layer is less than 100 μm.

Preferably, wherein the insulating medium layer is configured to include:

the first insulating part is arranged on the edge to be lapped of each flexible solar cell chip, and the second insulating part is matched with the negative electrode of the adjacent flexible solar cell chip;

wherein the first and second insulating portions each have a width of less than 20mm and a thickness of less than 200 μm.

Preferably, the lap joint region where the conductive adhesive layer and the insulating medium layer are located is configured as a connection region of each flexible solar cell chip;

the upper surface of each flexible solar cell chip is configured to be an effective light receiving area of each flexible solar cell chip in an area outside the lapping area where the conductive adhesive layer and the insulating medium layer are located;

wherein the width of the connection region is configured to be a micro-region connection of less than 0.8mm or a wide-region connection of more than 2 mm.

Preferably, wherein an area of the effective light receiving area is configured to be 0.1-100 mm.

Preferably, the conductive adhesive layer is configured to be a conductive adhesive tape or a conductive silver adhesive doped with nano-oxide, graphene, gold nanoparticles and aluminum nanoparticles;

wherein the overall lamination thickness of each flexible solar cell chip after containing the conductive adhesive layer is configured to be 60-200 μm.

The utility model discloses at least, include following beneficial effect: firstly, the utility model discloses creatively set up transparent conductive film among the solar module as the negative electrode of battery chip, dispose electrically conductive substrate into the positive electrode of battery chip, so need not to do the extra processing of positive electrode, negative electrode to each battery chip for its whole height after the stack is controllable, processing technology is simple, and the product yield is controllable;

and secondly, the utility model discloses a conducting resin layer combines together with the lapped mode, obtains one kind and does not have grid line and electrode, and solar cell minimum application size does not receive grid line and electrode restriction, has effectively solved among the prior art technical problem that solar cell minimum application size received grid line and electrode specification restriction.

Thirdly, the utility model adopts the lap joint processing mode of the structural conductive adhesive layer and the adjacent battery chip, so that the connection contact area is large and the circuit break is not easy to occur; welding is avoided, no dead zone exists, all light receiving areas can generate electricity, and the problems of circuit breaking caused by over-small contact area and dead zone caused by welding in the prior art are solved;

fourthly, the utility model discloses do the insulating treatment at the conducting resin layer edge and prevent the short circuit, effectively prevent to do not do the short circuit problem that the edge insulating treatment arouses among the prior art.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic structural diagram of patent No. CN 107134500A;

FIG. 2 is a schematic structural diagram of patent No. CN 207474474U;

FIG. 3 is a schematic structural diagram of patent No. CN 108520908A;

FIG. 4 is a schematic structural diagram of patent No. CN 104412357B;

fig. 5 is a schematic structural diagram of a flexible solar cell module according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a flexible solar cell module according to another embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a flexible solar cell module according to another embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

Fig. 5-6 illustrate an implementation of a novel flexible solar cell module according to the present invention, which includes a plurality of flexible solar cell chips 14;

the transparent conductive film is configured to be the negative electrode 15 of each flexible solar cell chip, the flexible conductive base material is configured to be the positive electrode 16 of each flexible solar cell chip, the transparent conductive film in the solar cell module is innovatively set to be the negative electrode of the cell chip, and the conductive base material is configured to be the positive electrode of the cell chip, so that the additional processing treatment of the positive electrode and the negative electrode of each cell chip is not needed, the overall height after the superposition is controllable, the processing technology is simple, and the product yield is controllable;

the technical scheme is that a plurality of battery chips with the same light receiving area are connected with the upper surface of the adjacent battery chip and the lower surface of the adjacent battery chip is connected with the upper surface of the next battery chip, namely the battery chips are combined with the lapping mode through the conductive adhesive layer to obtain a grid line and an electrode-free solar battery, the minimum application size of the solar battery is not limited by the grid line and the electrode, the technical problem that the minimum application size of the solar battery in the prior art is limited by the specifications of the grid line and the electrode is effectively solved, and meanwhile, the connection contact area is large and the circuit break is not easy to occur; welding is avoided, no dead zone exists, all areas can generate electricity, and the problems of open circuit and dead zone caused by welding in the prior art due to the fact that the contact area is too small are solved.

In another example as shown in fig. 5-6, each flexible solar cell chip is provided with rectangular or U-shaped insulating medium layers 18, 19 at the edge matched with the conductive adhesive layer, and the design of the rectangular structure (or called as O-shape) and the U-shape structure of each flexible solar cell chip enables the flexible solar cell chip to be matched with cell chips with different sizes, requirements on insulation in different occasions, and requirements on light receiving areas;

the insulating medium layer is configured to be obtained by adopting insulating ink or an insulating adhesive film, in the scheme, the insulating treatment is performed on the edge of the conductive adhesive layer to prevent short circuit, so that the short circuit problem caused by the fact that the edge insulating treatment is not performed in the prior art is effectively prevented, meanwhile, the medium is limited, so that the processing requirements of mechanical automation operation and manual operation can be met, meanwhile, if the insulating medium layer adopts the ink, the ink can be set to be a transparent structure or can be set to be non-transparent, so that the insulating adhesive film has better adaptability and functionality, and similarly, the insulating adhesive film can also be set to be a transparent structure or can be set to be a non-transparent structure according to the requirements.

In another example, the insulating medium layer is aligned with the outer edge of each flexible solar cell chip, the width of the insulating medium layer is configured to be less than 20mm, the thickness of the insulating medium layer is configured to be less than 100 μm, the range of the insulating medium layer is set so that the insulating medium layer meets the series connection requirement of the small blocked cell chips, and meanwhile, in order to match the requirement of small packaging, the width of the insulating medium layer cannot be larger than the effective light receiving area of the cell chip so as to prevent the cell chip from being inverted at the end, the range of the insulating medium layer is expanded, so that the effective use area of the cell chip is influenced.

In another example, as shown in fig. 7, the insulating dielectric layer is configured to include:

the first insulating part 20 is arranged on the edge to be lapped of each flexible solar cell chip, and the second insulating part 21 is matched with the negative electrode of the adjacent flexible solar cell chip;

the widths of the first insulating part and the second insulating part are both configured to be less than 20mm, the thicknesses of the first insulating part and the second insulating part are both configured to be less than 200 μm, in the scheme, the width of the insulating medium layer is set, so that the insulating medium layer can adapt to the connection requirement of a large-area battery chip, meanwhile, the circuit breaking phenomenon caused by other factors in the lapping process of a large battery chip is prevented through the design of an insulating structure of an excess part, the whole thickness of the battery chip is controlled, and in the scheme, the first insulating part and the second insulating part can be arranged to be of a separated structure or an integrated structure according to the requirement.

In another example, the overlapped area where the conductive adhesive layer and the insulating medium layer are located is configured as a connection area of each flexible solar cell chip;

wherein the width of the connection region is configured to be a micro-region connection within 0.8mm or a wide-region connection of 2mm or more;

in the micro-area connection and wide-area connection, if the maximum number of battery chips are pursued to be connected in series in the rated area, the width of the connection area is enabled not to exceed the effective light receiving area width of a single battery chip, if the maximum number of battery chips are pursued to be connected in series and the battery chip positioned on the outermost surface has the maximum light receiving area, the width of the connection area can be enabled to be larger than the effective light receiving area width of the single battery chip, so that a light receiving configuration which is gradually increased layer by layer in space is formed after superposition, the uppermost layer has the maximum light receiving area to meet the use requirements of different occasions on voltage output, in the scheme, the light receiving area is controlled to enable the connection area to contain more battery chips under the preset installation environment, the connection of the battery chips with different sizes is matched in the micro-area connection and wide-area connection mode, and when the number of the connection blocks is large, ensuring that the connection has better stability.

In another example, the area of the effective light receiving area is configured to be 0.1-100mm, which is used for setting by the size of the light receiving area, so that the light receiving area meets different installation environments, the installation area is limited, the number of installation blocks is limited according to the size, so that the voltage of the light receiving area after being connected in series can be improved by more than one time compared with the voltage of the prior art, the requirement of higher voltage output under the same installation area is met, and the requirement of miniaturization packaging is met.

In another example, the conductive adhesive layer is configured to be conductive adhesive tape or conductive silver adhesive doped with nano-oxide, graphene, gold nanoparticles and aluminum nanoparticles, and the conductive silver adhesive is doped with these particles, so as to ensure the conductive requirement under a small area by utilizing the chemical and electric properties of the conductive silver adhesive;

the whole lamination thickness of each flexible solar cell chip after containing the conductive adhesive layer is configured to be 60-200 μm, and the whole lamination thickness is limited by the thickness, so that the whole thickness of the battery assembly after being lapped is controllable, specifically, the thickness of the battery assembly can be reduced by 1/3-1/2 compared with the prior art, the reason is that the battery assembly in the utility model does not need grid lines and a packaging front plate, so that a finished product can be obtained by performing one-time packaging in a hot pressing mode after lapping is completed, the thickness of the finished product is usually only 200 μm and is usually only 200 μm, and the thickness of the finished product can be obtained by secondary packaging in the prior art due to the grid lines and the packaging front plate, and the thickness of the finished product is usually more than 400 μm.

A method of making a novel flexible solar module comprising:

according to the preset installation area or the preset light receiving area, the minimum light receiving area of each flexible solar cell chip is calculated according to the voltage output requirement, for example, the installation area of about half of the size of a bank card is 50mm x 45mm, 4-5V voltage is required to be output, a flexible CIGS solar cell with the open-circuit voltage of 600mV is selected, and according to a formula: the voltage is the voltage of a single solar cell, namely the voltage is the voltage of the single solar cell, and the number of the single solar cells is the number of the single solar cells connected in series, 8 flexible CIGS solar cells can meet the voltage requirement without a boosting device, and the length and the width of the minimum light receiving area are calculated to be 50mm by 5.6 mm;

according to the minimum light receiving area, increasing the areas of the conductive adhesive layer and the insulating medium layer within the area range to obtain the area to be cut of each flexible solar cell chip, selecting a wide-area connection or micro-area connection mode matched with the minimum light receiving area on the basis of the minimum light receiving area, and adding the area of the width of the connection area on the long side or the wide side of each flexible solar cell to obtain the area to be cut;

cutting the flexible solar cell according to the size of the area to be cut to obtain a plurality of flexible solar cell chips;

respectively arranging corresponding rectangular or U-shaped insulating medium layers at the positions of the flexible solar cell chips to be lapped;

arranging corresponding conductive adhesive layers on the inner sides of the insulating medium layers on the flexible solar cell chips;

each flexible solar cell chip is connected in series by matching with the conductive adhesive layer in a lap joint mode to obtain a single-row flexible solar cell module in a preset installation area or a preset light receiving area, the structure of the single-row flexible solar cell module is shown as figure 5, in the scheme, the preparation method of the single-row flexible solar cell module is limited, so that the single-row flexible solar cell module can realize lap joint of multiple cell chips in a small range in the same installation area compared with the prior art of tiled series connection, the output voltage of the single-row flexible solar cell module can be obviously increased in the same installation area by setting a plurality of cell chips so as to meet the requirements of package miniaturization and high-voltage output on solar cells, for example, under the installation area with the length and width of 50mm × 45mm, the cell module in the prior art has the grid line spacing of about 3.3mm and the grid line spacing of about 4mm, and adopts the grid line series connection mode, the solar cell module can accommodate the serial connection of 12 cell chips with the length and the width of a single row of 50mm by 3.5mm at most, and the serial connection of 24 cell chips with the length and the width of a single row of 50mm by 18mm at most by adopting the scheme, the output voltage can be multiplied, and the number of the cell chips can be reduced adaptively according to the thickness of the solar cell module. The flexible solar cell module prepared by the scheme has no dead zone, and the photoelectric conversion ratio is improved; the edge is insulated, so that the short circuit of the battery is avoided; the connection contact area is large, and disconnection is not easy to occur; the minimum area of the cell chip is not restricted, and the increasingly high requirements of the mobile product field on the solar cell can be met.

In another example, the insulating medium layer is insulating ink which is arranged on the outer edge of each flexible solar cell chip through screen printing or inkjet printing, or an insulating adhesive film which is manually or automatically arranged on the outer edge of each flexible solar cell chip;

the conductive adhesive layer is obtained by doping or modifying conductive silver adhesive with nano oxides, graphene, gold nanoparticles and aluminum nanoparticles, or is a conductive adhesive tape, and the mode is adopted to adapt to installation modes of different media so as to adapt to different processing requirements.

In another example, a plurality of rows of the single-row flexible solar cell modules are connected in parallel to obtain a combined flexible solar cell module, and a plurality of rows of the flexible solar cell modules can be connected in parallel according to needs, so that the voltages between the rows are the same, but the current can be increased, so that the current and the voltage can meet the use requirements of different occasions, and the structural layout is as shown in fig. 6;

each single-row flexible solar cell module is obtained by connecting 1-2 or more than 6 flexible solar cell chips in series, the currents in the single-row cell chips are the same in the series connection mode, but the voltages can be superposed so as to meet the use requirements of different scenes and different specifications on the voltages.

The use of this scheme is merely illustrative of a preferred embodiment and is not intended to be limiting. When the utility model is implemented, the proper replacement and/or modification can be carried out according to the requirements of users.

The utility model discloses a novel flexible solar cell module and a preparation method thereof; the transparent conductive film on the upper surface of the flexible solar cell is used as a negative electrode; the lower surface flexible conductive substrate is used as a positive electrode; the positive electrode is directly contacted with the transparent conductive film of the adjacent flexible solar cell to form conductive connection; and a U-shaped or O-shaped insulating layer is arranged in the negative electrode area of the contact area of the positive electrode and the negative electrode of the flexible solar cell. The utility model has no battery grid line and simple and convenient preparation; the method is not limited by the specification of the grid line, the specification of the battery piece can be flexibly adjusted, and no dead zone and no welding are realized; the insulating medium layer can avoid short circuit and improve the reliability of the battery; the flexible adjustment of voltage and current is realized in a small area range through series connection, and the application requirement of the field of mobile products on flexible solar cells is met.

The number of apparatuses and the scale of the process described here are intended to simplify the description of the present invention. Applications, modifications and variations of the novel flexible solar cell module and the method of making the same of the present invention will be apparent to those skilled in the art.

While embodiments of the invention have been disclosed above, it is not intended to be limited to the applications listed in the specification and the examples. It can be applicable to various and be fit for the utility model discloses a field completely. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. A novel flexible solar cell module is characterized by comprising a plurality of flexible solar cell chips;

2. The novel flexible solar cell module as claimed in claim 1, wherein each flexible solar cell chip is provided with a rectangular or U-shaped insulating medium layer at the edge matched with the conductive adhesive layer;

3. The novel flexible solar cell module as claimed in claim 2, wherein the insulating dielectric layer is aligned with the outer edge of each flexible solar cell chip, and has a width configured to be less than 20mm and a thickness configured to be less than 100 μm.

4. The novel flexible solar cell module as claimed in claim 2, wherein the insulating dielectric layer is configured to include:

5. The novel flexible solar cell module as claimed in claim 1, wherein the bonding region where the conductive adhesive layer and the insulating medium layer are located is configured as a connection region of each flexible solar cell chip;

6. The novel flexible solar cell module as claimed in claim 5, wherein the area of the effective light receiving area is configured to be 0.1-100 mm.

7. The novel flexible solar cell module as claimed in claim 1, wherein the conductive glue layer is configured as a conductive tape or a conductive silver glue doped with nano-oxides, graphene, gold nanoparticles, aluminum nanoparticles;