CN207038536U - Solar cell packaging structure - Google Patents

Abstract

The utility model discloses a solar battery packaging structure. The solar battery packaging structure of the utility model comprises: a packaging bag, a solar battery vacuum-packed inside the packaging bag, and two electrode leads, and one end of each of the two electrode leads is respectively It is connected to the two electrodes of the solar cell inside the packaging bag, and the unconnected ends of the two electrode leads are used as reserved lead wires to lead out of the packaging bag. The solar cell packaging structure of the utility model can completely seal the entire battery, prevent device rupture or leakage of battery raw materials, can well isolate water and oxygen, ensure the light absorption efficiency of the solar cell, and can be compatible with rigid and flexible solar cells, and can The lead-out electrodes are convenient for connecting external circuits and prolong the life of solar cells.

Description

A solar cell packaging structure

technical field

The utility model belongs to the field of solar cells, in particular to the field of perovskite solar cells, and relates to a solar cell packaging structure, in particular to a solar cell vacuum packaging structure.

Background technique

Due to the increasing shortage of resources, solar energy, as an inexhaustible and inexhaustible new green energy, has been widely valued by all walks of life. The possibility of solar cells as one of the main sources of power supply for power generation has attracted increasing attention.

Encapsulation technology has an important impact on battery life during the use of solar cells. Existing solar cells mainly rely on glass-encapsulated solar cells. For example, CN102222731A discloses a solar cell packaging method that improves the conversion efficiency of solar cells. The scheme adopted is: Place the connected solar panel between two pieces of glass, and seal the two glass panels with adhesive and sealant around them. Reserve air holes before packaging. After the sealant around the glass is cured, vacuumize and then Seal the vent hole. The utility model makes the recovery of silicon wafers simple and easy, improves the conversion efficiency of silicon-based solar cells, increases the conversion efficiency of solar cells by 10% to 15% on the original basis, prolongs the service life of solar cells and reduces production costs. cost, etc.; as CN202268366U discloses a glass-encapsulated solar cell module board, including a solar cell, a glass top plate fixed on the upper surface of the solar cell, a glass bottom plate fixed on the lower surface of the solar cell, and a A junction box on the lower surface of the glass bottom plate; at least two through holes for fixing are arranged on the glass-encapsulated solar cell module board. The structure of the solar cell module plate is stable, so that the packaging component of the solar cell frame is more durable.

However, the above-mentioned glass encapsulation method has the following disadvantages: (1) The thickness of the solar cell obtained after encapsulation increases (2) The flexible solar cell cannot be encapsulated (3) It is easily broken and damaged during installation (4) It is not easy to discharge The gas between the encapsulation glass and the cell.

Utility model content

In view of the defects existing in the prior art, the purpose of this utility model is to provide a solar cell packaging structure, which can completely seal the entire battery, block water and oxygen, and prevent device rupture or leakage of battery raw materials , can be compatible with rigid solar cells and flexible solar cells, and can lead out electrodes for easy connection to external circuits, thereby prolonging the life of solar cells.

For reaching above-mentioned purpose, the utility model adopts following technical scheme:

The utility model provides a solar cell packaging structure, which comprises: a packaging bag, a solar cell vacuum-packaged inside the packaging bag, and two electrode leads;

One end of each of the two electrode leads is respectively connected to two electrodes of the solar cell inside the packaging bag, and the respective unconnected ends of the two electrode leads are used as reserved lead wires to lead out of the packaging bag.

The solar battery packaging structure of the utility model is a solar battery vacuum packaging structure.

The material of the packaging bag includes any one or a combination of at least two of polypropylene, polycarbonate, polystyrene, polymethyl methacrylate, polyethylene, polyvinyl chloride or polydimethylsiloxane , but not limited to the above materials, other materials that meet the following conditions can also be used in the utility model: ① high light transmittance, greater than 85%; ② has a certain strength, can withstand a certain negative pressure, about -30Pa; ③ The chemical properties are inactive and do not react with battery materials; ④ has a certain degree of ductility, and the elongation rate is greater than 8%, which is convenient for packaging flexible solar cells; ⑤ The structure is compact and can block water and oxygen.

The material of the packaging bag selected by the utility model has good light transmittance, thereby ensuring the light intensity when the solar cell is used after the packaging is completed.

In the present invention, the flexibility of the substrate of the solar cell is not limited, it may be a flexible substrate or a rigid substrate, and those skilled in the art may choose according to needs.

Preferably, the electrode lead is any one or a combination of at least two of metal wires or composite metal wires.

Preferably, the metal wires include any one of gold wires or copper wires. The above metal wires have excellent electrical conductivity and can be used as electrode leads to lead out electrodes well.

Preferably, the composite metal wire includes any one of gold-tin alloy wire, copper-tin alloy wire or silver-indium alloy wire. The above composite metal wire has excellent electrical conductivity and can be used as an electrode lead to lead out electrodes well.

Preferably, the diameter of the electrode lead wire is 0.2 mm to 10 mm, such as 0.2 mm, 0.5 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm , 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm, etc. If the diameter of the electrode lead is less than 0.2mm, the lead-out effect of the electrode will be deteriorated; if the diameter of the electrode lead is greater than 10mm, the package bag will leak during vacuum packaging. Therefore, the diameter of the electrode lead is preferably 0.2 mm to 10 mm in the present invention, so as to ensure good electrode lead-out effect and prevent air leakage of the packaging bag during vacuum packaging.

Preferably, the two electrodes are positive and negative electrodes of the solar cell.

In the present invention, the electrode can be a metal electrode or a conductive substrate.

Preferably, the conductive substrate includes fluorine-doped tin oxide (Fluorinated Tin Oxide, FTO) conductive glass, indium tin oxide semiconductor (Indium Tin Oxide, ITO) conductive glass, FTO conductive polyethylene naphthalate ( Polyethylene Naphthalate, PEN) film, FTO conductive polyethylene terephthalate (Polyethylene Terephthalate, PET) film, ITO conductive PEN film or ITO conductive PET film, or a combination of at least two.

The connection mode is any one of mode 1 or mode 2. Mode 1 is: 2 electrode leads are respectively spot-welded on 2 electrodes of the solar cell.

The second way is: two electrode lead wires are respectively wound on two electrodes of the solar cell. This method is prone to poor conductivity due to poor contact. The use of silver paste or soldering is to use their viscosity to bond the wire to the electrode, thereby improving the conductivity.

In the utility model, when the electrode is a metal electrode (such as a silver electrode commonly used as a negative electrode), a direct lead wire can be used (such as spot welding the electrode lead wire on the electrode), or the electrode lead wire can be wound around the electrode. The above method, that is to say, either method 1 or method 2 can be used for connection.

More preferably, when the electrodes are metal electrodes, the connection method adopted is the first method.

Preferably, when the electrodes are conductive substrates (such as FTO or ITO electrodes coated on glass, referred to as FTO conductive glass electrodes or ITO conductive glass electrodes), since conductive substrates such as FTO conductive glass and ITO conductive glass are not suitable Like the metal electrodes, the direct wiring method is adopted, therefore, the second method is preferred to realize the connection for the conductive substrate.

As a preferred technical scheme of the solar cell packaging structure described in the present invention, the connection between the electrode leads and the electrodes is also coated with silver paste or spot soldering tin. The use of silver paste or soldering is to utilize their viscosity to connect the electrode leads to the electrodes. Adhesion is performed to improve contact between electrode leads and electrodes.

In the present invention, the silver paste used is preferably a low-temperature silver paste, and the mainstream low-temperature silver paste products on the market can be selected. Generally speaking, it can be cured quickly at 50°C.

In the utility model, the consumption of the silver paste depends on the size of the electrode, and it only needs to be bonded to the electrode lead wire and the electrode.

Preferably, when the first connection is adopted to realize the connection, solder is placed at the connection between the electrode lead and the electrode.

Preferably, when the connection is realized in the second manner, silver paste is coated at the connection between the electrode lead and the electrode.

The solar cell packaging structure of the present utility model can be prepared by the following method:

(1) Connect two electrode leads to the two electrodes of the solar cell, and use the unconnected ends of the two electrode leads as reserved leads;

(2) Put the solar cell inside the packaging bag, lead the reserved lead wire to the outside of the packaging bag, seal the packaging bag with a vacuum sealing machine, and take out the gas in the packaging bag to achieve vacuum sealing;

(3) Epoxy resin glue is coated on the contact surface of the reserved lead wire and the packaging bag, cured, and the packaging of the solar cell is completed to obtain a solar cell packaging structure.

As a preferred technical solution of the above method, the method also includes the following steps after step (1) connecting two electrode leads to the two electrodes of the solar cell respectively: contacting at the junction of the electrode leads and the electrodes spot soldering on the interface; or, coating silver paste on the contact interface between the electrode lead and the electrode, so as to improve the contact between the electrode lead and the electrode.

Compared with the prior art, the utility model has the beneficial effects of:

The utility model provides a solar battery packaging structure, which can completely seal the whole battery, prevent solar battery devices from breaking or battery raw materials from leaking, can well block water and oxygen, and has good light transmittance The packaging of the packaging bag does not affect the efficient use of solar cells, ensures the light absorption efficiency of solar cells, and can lead out electrodes for easy connection to external circuits, and has a long service life.

Description of drawings

Fig. 1 is a top view schematic diagram of the solar cell packaging structure of embodiment 1, wherein, 1 is the packaging bag used for packaging the battery, and 2 is the electrode lead;

Fig. 2 is the solar cell encapsulation structure of embodiment 1 along the cross-sectional schematic view of AA' in Fig. 1, wherein, 1 is a packaging bag, 2 is an electrode lead, 3 is an electrode of a solar cell; 4 is a solar cell;

FIG. 3 is a graph showing the variation of photoelectric conversion efficiency with time of the solar cell encapsulation structure in Example 1. FIG.

detailed description

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

Example 1

This embodiment provides a solar cell packaging structure, which includes: a packaging bag, a solar cell vacuum-packaged inside the packaging bag, and 2 electrode leads;

One end of each of the two electrode leads is respectively connected to two electrodes (that is, one is a positive pole and the other is a negative pole) of the solar cell inside the packaging bag, and the connection mode is to be wound on the two electrodes respectively, and the two electrodes The respective unconnected ends of the lead wires are used as reserved lead wires, and are drawn out of the packaging bag.

Among them, the solar cell is a perovskite solar cell device with an area of 10cm×10cm; the packaging bag is a polystyrene vacuum packaging bag; the two electrode leads are conductive gold-tin alloy wires with a diameter of 3mm.

test:

Under the simulated sunlight of AM 1.5G, 100mW cm ^-2 , the photoelectric conversion efficiency of the encapsulated perovskite solar cell was tested over time. The test results are shown in Figure 3. The test data were normalized and processed into Compared with the efficiency change of the initial value, it can be seen from the figure that the efficiency of the solar cell is basically unchanged for 40 days after encapsulation, and the encapsulation effect is better.

Example 2

Except that the polystyrene vacuum-packed bag is replaced by a polypropylene vacuum-packed bag, other contents are the same as in Example 1.

Example 3

Except that the polystyrene vacuum-packed bag is replaced by a polyvinyl chloride vacuum-packed bag, other contents are the same as in Example 1.

Example 4

Except that the two electrode leads were replaced by copper wires with a diameter of 5 mm, other contents were the same as in Embodiment 1.

Example 5

Except that the two electrode leads were replaced by gold wires with a diameter of 0.5 mm, other contents were the same as in Embodiment 1.

Example 6

Except that silver paste is coated at the junction of electrode leads and electrodes, other contents are the same as in Embodiment 1.

Example 7

Except that the connection mode of the electrode lead and the positive electrode is spot welding, other contents are the same as in Embodiment 1.

Example 8

This embodiment provides a solar cell packaging structure, which includes: a packaging bag, a solar cell vacuum-packaged inside the packaging bag, and 2 electrode leads;

One end of each of the two electrode leads is respectively connected to two electrodes (that is, one is a positive pole and the other is a negative pole) of the solar cell inside the packaging bag, and the connection mode is to be wound on the two electrodes respectively, and the two electrodes The respective unconnected ends of the lead wires are used as reserved lead wires, and are drawn out of the packaging bag.

Among them, the solar cell is a flexible solar cell; the packaging bag is polyvinyl chloride; the two electrode leads are conductive gold-tin alloy wires with a diameter of 3 mm.

The applicant declares that the utility model illustrates the detailed method of the utility model through the above-mentioned embodiments, but the utility model is not limited to the above-mentioned detailed method, that is, it does not mean that the utility model must rely on the above-mentioned detailed method to be implemented. Those skilled in the art should understand that any improvement of the utility model, the equivalent replacement of each raw material of the utility model product, the addition of auxiliary components, the selection of specific methods, etc., all fall within the scope of protection and disclosure of the utility model within.

Claims (9)

1. A solar cell encapsulation structure, characterized in that the encapsulation structure comprises: an encapsulation bag, a solar cell vacuum-packed inside the encapsulation bag, and two electrode leads; One end of each of the two electrode leads is respectively connected to two electrodes of the solar cell inside the packaging bag, and the respective unconnected ends of the two electrode leads are used as reserved lead wires to lead out of the packaging bag. 2. The packaging structure according to claim 1, wherein the substrate of the solar cell is any one of a flexible substrate or a rigid substrate. 3 . The packaging structure according to claim 1 , wherein the electrode leads are any one or a combination of at least two of metal wires or composite metal wires. 4 . 4. The packaging structure according to claim 3, wherein the metal wire comprises any one of gold wire or copper wire, and the composite metal wire comprises gold-tin alloy, copper-tin alloy or silver-indium alloy any of the 5 . The package structure according to claim 1 , wherein the diameter of the electrode lead is 0.2 mm˜10 mm. 6. The packaging structure according to claim 1, wherein the two electrodes are respectively the positive pole and the negative pole of the solar cell; The electrode is any one of a metal electrode or a conductive substrate, and the conductive substrate includes fluorine-doped tin oxide FTO conductive glass, indium tin oxide semiconductor ITO conductive glass, FTO conductive polyethylene naphthalate PEN Film, FTO conductive polyethylene terephthalate PET film, ITO conductive PEN film or ITO conductive PET film, or a combination of at least two. 7. The package structure according to claim 1, characterized in that, the connection method is any one of method 1 or method 2, and method 1 is: 2 electrode leads are respectively spot-welded to 2 solar cells. on the electrode; The second method is: two electrode leads are respectively wound on two electrodes of the solar cell; When the electrode is a metal electrode, the connection method is the first method; When the electrode is a conductive substrate, the connection method is the second method. 8 . The packaging structure according to claim 1 , wherein silver paste or spot solder is coated at the junction of the electrode lead and the electrode, so as to improve the contact between the electrode lead and the electrode. 9. The packaging structure according to claim 7, characterized in that, when adopting the first method to realize the connection, spot solder at the junction of the electrode lead and the electrode; when adopting the second method to realize the connection, at the Silver paste is coated at the junction of the electrode lead and the electrode.