Photovoltaic adhesive film assembly and photovoltaic assembly

Abstract

The utility model discloses a photovoltaic adhesive film assembly and a photovoltaic assembly, the photovoltaic adhesive film assembly is laminated, in the scheme, an adhesive film III is arranged between an upper adhesive film I and a lower adhesive film II, in the scheme, a multi-layer structure is adopted, a molding adhesive film III made of a proper material can be selected according to requirements, for example, the molding adhesive film III made of a material with a metal ion blocking capability can be selected, and the molding adhesive film III can be made of a material with a metal ion blocking capability. The adhesive film can be formed by materials with high volume resistivity, common POE adhesive films, white adhesive films containing titanium dioxide or other white inorganic oxide particles and the like, the whole adhesive film material does not need to be replaced, the PI D attenuation speed is reduced, meanwhile, the cost is reduced, and the service life of a battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic devices, in particular to a photovoltaic film component and a photovoltaic component. Background Art

[0002] Photovoltaic film is a material that plays a key role in the packaging of photovoltaic modules. Common photovoltaic modules generally include a front cover plate 01 and a back plate 05, and a film and a cell between the cover plate and the back plate. Figure 3 As shown, the adhesive film is generally two layers. During assembly, the cell 03 is placed between the adhesive film 1 02 and the adhesive film 2 04. After that, the adhesive film 1 02 and the adhesive film 2 04 are laminated at high temperature to fill the front and back sides of the cell and the gap to form a package. The cell is in a sealed space surrounded by the adhesive film 1 and the adhesive film 2. The adhesive film 1 and the adhesive film 2 are generally made of EVA material, which has the advantages of light transmittance and high water vapor barrier rate. The defects are: low volume resistivity, and metal ions in the cover plate and other places are easy to migrate into the photovoltaic module. If it migrates to the position of the adhesive film in the cell gap and then transfers to the back of the cell, the metal ions are positively charged and will neutralize the negative charge at the AlOx-SiOx interface on the back of the PERC cell, weakening the field passivation effect of the negative charge there, increasing the minority carrier recombination rate on the back, reducing the cell efficiency, forming PID attenuation, and reducing the battery life.

[0003] To solve the above problems, some companies have changed the molding of all films to materials with high volume resistivity, which is costly and needs to be improved. Utility Model Content

[0004] In order to solve at least one of the above technical defects, the utility model provides the following technical solutions:

[0005] The first aspect of the present application document discloses a photovoltaic film assembly, which is in a laminated form and includes a light-transmitting film 1 and a film 2, between which a film 3 is arranged, and the film 3 has the property of blocking metal ions, and a plurality of through holes are arranged at intervals on the film 3, and the size of the through holes meets the insertion of battery cells, and the openings of the through holes correspond to the film 1 and the film 2 above and below, respectively, and cooperate to form a sealed space.

[0006] In this solution, a third film is arranged between the upper and lower films 1 and 2, and the multi-layer configuration allows the molding of the third film with a suitable material to be selected according to demand, such as molding the third film with a material having the ability to block metal ions, such as molding with a material with a higher volume resistivity, such as a POE film, a white film containing titanium dioxide or other white inorganic oxide particles, etc. There is no need to replace all the film materials as a whole, which helps to reduce costs while meeting the requirement of reducing the PID attenuation rate and helps to extend the battery life.

[0007] The third adhesive film is formed with through holes for the battery cells to be placed, which is convenient for assembly and molding. The first and second adhesive films are made of common EVA materials.

[0008] Furthermore, the adhesive film three is formed of POE material.

[0009] Furthermore, the adhesive film three is a white adhesive film, which is a white film layer formed by adding titanium dioxide or other white inorganic oxide particles into a conventional adhesive film.

[0010] Furthermore, the adhesive film three is in a grid shape, and the through holes on the adhesive film three are evenly distributed so that the whole is in a grid shape, which is convenient for evenly placing the battery cells.

[0011] Furthermore, the adhesive film 1 and the adhesive film 2 are of EVA type, and the adhesive film 3 is of POE type.

[0012] The second aspect of the present application discloses a photovoltaic module, including the above-mentioned photovoltaic film module and battery cells. The battery cells are located in a sealed space surrounded by through holes on the first, second and third films. The barrier of metal ions by the third film helps to extend the life of the battery.

[0013] Furthermore, the side surface of the battery cell is bonded to the wall of the through hole, and the front and back surfaces of the battery cell are bonded to the corresponding adhesive film 1 and adhesive film 2. The bonding structure helps to improve stability and further reduce interference.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The utility model improves the structure of the film component and has a multi-layer configuration. The material of the corresponding film layer can be replaced according to the selection. For example, the film three is formed with a material having the performance of blocking metal ions. There is no need to replace the material as a whole, which helps to reduce costs and reduce the PID attenuation rate. The through holes formed on the film three are convenient for assembly, and the life of the photovoltaic cells containing the film component is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a schematic diagram of the exploded structure of the photovoltaic module in Example 1;

[0018] Figure 2 is a schematic diagram of the structure of the photovoltaic module in Example 1;

[0019] Figure 3It is a schematic diagram of the structure of an existing photovoltaic module;

[0020] Figure 4 is a schematic diagram of the structure of the grid film three;

[0021] Wherein, the accompanying drawings are marked as follows:

[0022] 01. Cover plate; 02. Adhesive film 1; 03. Battery cell; 04. Adhesive film 2; 05. Back plate; 06. Adhesive film 3; 07. Through hole. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] like Figure 1 , Figure 2 As shown, in this example, the photovoltaic module includes a photovoltaic film module and a cover plate 01 and a back plate 02 at the upper and lower positions thereof, wherein the photovoltaic film module is in a laminated state, that is, the upper and lower film layers are stacked, specifically including a light-transmitting film 1 02, a film 2 04 and a film 3 06, wherein the film 1 02 and the film 2 04 are formed of a common EVA material, and the film 3 06 is arranged between the film 1 02 and the film 2 04, as shown in FIG. Figure 2 As shown in the stacked arrangement, the film 306 has the property of blocking metal ions and is formed of a material with a relatively large volume resistivity. In this example, POE material is used to form the film layer. Of course, other materials that meet the requirements of photovoltaic modules and resistors can also be used, such as white film. White film is a white film layer formed by adding titanium dioxide or other white inorganic oxide particles to a conventional film.

[0026] In this example, a plurality of through holes 07 are formed on the adhesive film 3 06 at intervals. The upper and lower openings of the through holes 07 are located at the top and bottom surfaces of the adhesive film 3 06 respectively, so as to be opposite to the adhesive film 1 02 and the adhesive film 2 04 corresponding to the upper and lower sides. The size of the through holes meets the requirements for the placement of the battery cell. For example, the common configuration of the battery cell is a rectangular sheet, and the corresponding through hole is a rectangle. The length, width and height of the through hole are consistent with or slightly larger than the corresponding size of the battery. The distribution of the through holes can be selected according to the needs, such as Figure 4 The through holes 07 are evenly spaced horizontally and vertically to form a grid pattern on the adhesive film.

[0027] The three through holes 07 of the adhesive film cooperate with the adhesive films 1 and 2 above and below to form a sealed space, and the battery cell 03 is in the sealed space. One assembly method is as follows: place the adhesive film 2 on the back plate, place the adhesive film 3 on the adhesive film 2, and then place the battery cell in the through hole, and then place the adhesive film 1 and the cover plate, and perform high-temperature laminated material after stacking. The adhesive films 1, 2, and 3 are melted and bonded. The adhesive films 1 and 2 are melted and filled to the front and back of the battery cell to fit each other. The adhesive film 3 is melted to make the through hole wall fit with the side of the battery cell. The adhesive films 1 and 2 cooperate with the three through holes of the adhesive films to form a sealed space. The battery cell is in the sealed space to reduce external interference.

[0028] For the adhesive film 1, adhesive film 2, and adhesive film 3, a film layer of sufficient thickness can be directly formed with the corresponding material, or multiple film layers can be preformed and then stacked to form the corresponding adhesive film. The material of each film layer can be selected according to demand.

[0029] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A photovoltaic film assembly, wherein the photovoltaic film assembly is in a laminated form, comprising a light-transmitting film 1 (02) and a film 2 (04), characterized in that: Adhesive film three (06) is arranged between adhesive film one (02) and adhesive film two (04), and the adhesive film three (06) has the property of blocking metal ions. A plurality of through holes (07) are arranged on the adhesive film three (06) at intervals, and the size of the through holes (07) meets the requirements for the placement of battery cells. The openings of the through holes (07) correspond to the adhesive films one (02) and two (04) above and below, respectively, and cooperate with each other to form a sealed space.

2. The photovoltaic film assembly according to claim 1, characterized in that: The adhesive film three (06) is formed of POE material.

3. The photovoltaic film assembly according to claim 1, characterized in that: The adhesive film three (06) is a white adhesive film.

4. The photovoltaic film assembly according to claim 1, characterized in that: The adhesive film three (06) is in a grid shape.

5. The photovoltaic film assembly according to claim 1, characterized in that: The adhesive film one (02) and the adhesive film two (04) are of EVA type, and the adhesive film three (06) is of POE type.

6. A photovoltaic module, comprising the photovoltaic film module and the solar cell (03) according to any one of claims 1 to 5, characterized in that: The battery cell (03) is located in a sealed space surrounded by the through holes on the adhesive film 1 (02), the adhesive film 2 (04) and the adhesive film 3 (06).

7. The photovoltaic module according to claim 6, characterized in that: The side surface of the battery cell (03) is bonded to the hole wall of the through hole (07), and the front and back surfaces of the battery cell (03) are bonded to the corresponding adhesive film 1 (02) and adhesive film 2 (04).

Images