CN219066830U

CN219066830U - Single-glass TOPCON battery assembly

Info

Publication number: CN219066830U
Application number: CN202222792767.5U
Authority: CN
Inventors: 李民; 覃勇
Original assignee: Shanghai HIUV Applied Materials Technology Co Ltd; Shanghai HIUV New Materials Co Ltd
Current assignee: Shanghai HIUV Applied Materials Technology Co Ltd; Shanghai HIUV New Materials Co Ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-05-23
Anticipated expiration: 2032-10-21

Abstract

The application relates to the field of photovoltaic modules, and specifically discloses a single-glass TOPCN battery module, including glass, first glued membrane, TOPCN battery array, second glued membrane and the backplate that set gradually, the second glued membrane includes the water absorption layer that possesses the water absorption characteristic. The main material of the water absorption layer contains water absorption auxiliary agent, so that the water absorption layer has excellent water absorption and water locking performance, and the second adhesive film is endowed with water absorption characteristics. Therefore, the second adhesive film can absorb water vapor which tries to invade the inside of the single-glass TOPCO battery assembly, and can prevent the water vapor from entering the inside of the TOPCO battery assembly, so that the possibility that the water vapor contacts the TOPCO battery array is reduced, and the water blocking performance of the single-glass TOPCO battery assembly is improved.

Description

Single-glass TOPCON battery assembly

Technical Field

The utility model relates to the field of photovoltaic modules, in particular to a single-glass TOPCON battery module.

Background

The tunneling oxide layer passivation contact solar cell, namely TOPCON cell, is a novel passivation contact solar cell proposed by French Hough solar research institute of Germany in 2013 for the first time. The TOPCON battery structure is an N-type silicon substrate battery, firstly, a layer of ultrathin silicon oxide is prepared on the back of the battery, then, a doped silicon thin layer is deposited, the ultrathin silicon oxide and the doped silicon thin layer form a passivation contact structure together, surface recombination and metal contact recombination are effectively reduced, and a larger space is provided for further improving the photoelectric conversion efficiency of the N-PERT battery. Compared with the traditional solar cell, the electrode on the front surface of the TOPCO cell is improved from pure silver paste to silver aluminum paste, water vapor can invade the front surface of the cell through gaps in the cell array, the silver aluminum paste is corroded, the transmission of electric energy converted by a cell sheet is affected, and the TOPCO power generation efficiency is reduced.

The TOPCon battery can be classified into a single-glass TOPCon battery and a dual-glass TOPCon battery according to its interlayer structure. The current single-glass TOPCon battery is generally assembled according to the structure of glass-packaging adhesive film-TOPCon battery array-packaging adhesive film-backboard, and then laminated to enable the packaging adhesive film to be crosslinked and solidified so as to bond the glass, the battery piece array and the backboard into a whole, thereby obtaining the single-glass TOPCon battery assembly.

During use of the single-glass TOPCO battery assembly, a portion of water vapor may enter the interior of the single-glass TOPCO battery assembly from the back side of the single-glass TOPCO battery assembly, thereby adversely affecting the single-glass TOPCO battery array. Therefore, there is a need to develop a single-glass TOPCon battery module with higher water blocking performance.

Disclosure of Invention

In order to solve the problem of poor water blocking performance of the single-glass TOPCO battery assembly, the application provides the single-glass TOPCO battery assembly.

The single-glass TOPCon battery assembly provided by the application adopts the following technical scheme:

a single glass TOPCon battery assembly comprises glass, a first adhesive film, a TOPCon battery array, a second adhesive film and a back plate which are sequentially arranged, wherein the second adhesive film comprises a water absorption layer with water absorption characteristics.

By adopting the technical scheme, the main material of the water-absorbing layer contains the water-absorbing auxiliary agent, and the water-absorbing auxiliary agent enables the water-absorbing layer to have excellent water-absorbing and water-locking properties, so that the water-absorbing property of the second adhesive film is endowed. Therefore, the second adhesive film can generate an adsorption effect on water vapor trying to invade the inside of the single-glass TOPCO battery assembly, prevent the water vapor from entering the inside of the TOPCO battery assembly, reduce the possibility of water vapor contact and corrosion of the TOPCO battery array, improve the water blocking performance of the single-glass TOPCO battery assembly and enhance the attenuation resistance effect of the single-glass TOPCO battery assembly.

Optionally, the second adhesive film includes a first hydrophobic layer tightly combined with the water absorbing layer, and the first hydrophobic layer is attached to the TOPCO battery array.

Through adopting above-mentioned technical scheme, the absorbed water layer can produce the adsorption to trying inside vapor that invades TOPCO battery pack, and first hydrophobic layer can reject outside TOPCO battery array vapor, effectively prevents the invasion of vapor. Therefore, the water blocking effect of the second adhesive film is improved through a hydrophobic-hydrophilic two-layer structure, so that the TOPCO battery array is effectively protected.

Optionally, the thickness of the second adhesive film is 0.35-0.7mm, and the thickness ratio of the first hydrophobic layer to the water absorption layer is 1 (1-5).

By adopting the technical scheme, the thickness of the second adhesive film is moderate in the range, the water blocking effect and the ageing resistance are good, and the application in the field can be met. And when the thickness ratio of the two-layer structure of the second adhesive film is in the range, the finally obtained second adhesive film has better water blocking performance and ageing resistance.

Optionally, the second adhesive film further includes a second hydrophobic layer tightly combined with the water absorbing layer, and the water absorbing layer is sandwiched between the first hydrophobic layer and the second hydrophobic layer.

By adopting the technical scheme, the water absorption layer can absorb water vapor which is tried to invade the inside of the TOPCO battery assembly; the first hydrophobic layer can repel water vapor out of the TOPCO battery array, so that the invasion of the water vapor is effectively prevented; the second hydrophobic layer can repel water vapor on one side of the second adhesive film close to the backboard, so that the adhesive film forms a water blocking structure with three layers of hydrophobic-water absorbing-hydrophobic, the water blocking effect of the second adhesive film is further improved, the influence of the water vapor on the TOPCO battery array is further reduced, and the ageing of the single-glass TOPCO battery assembly is further slowed down.

Optionally, the thickness of the second adhesive film is 0.35-0.7mm, and the thickness ratio of the first hydrophobic layer to the water absorbing layer to the second hydrophobic layer is 1 (1-5): 1.

By adopting the technical scheme, the total thickness of the second adhesive film is moderate, the water blocking effect and the ageing resistance are good, and the application in the field can be satisfied. And when the thickness ratio of the three-layer structure of the second adhesive film is in the range, the finally obtained second adhesive film has better water blocking performance and ageing resistance.

Optionally, the second adhesive film is a transparent adhesive film or a white adhesive film.

Optionally, the first adhesive film comprises at least one EVA layer and/or at least one POE layer.

Optionally, the main material of the water absorbing layer is EVA.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the second adhesive film comprises the water absorption layer with the water absorption characteristic, and the main material of the water absorption layer comprises the water absorption auxiliary agent, so that the water absorption layer has excellent water absorption and water locking performance, the water absorption characteristic of the second adhesive film is endowed, the second adhesive film can absorb water vapor which tries to invade the interior of the single-glass TOPCO battery assembly, and the water blocking performance of the single-glass TOPCO battery assembly is improved;

2. the second adhesive film comprises a first hydrophobic layer, a water-absorbing layer and a second hydrophobic layer which are sequentially connected, wherein the water-absorbing layer can absorb water vapor trying to invade the TOPCO battery assembly; the first hydrophobic layer can repel water vapor out of the TOPCO battery array, so that the invasion of the water vapor is effectively prevented; the second hydrophobic layer can repel water vapor on one side of the second adhesive film close to the back plate, so that the water blocking effect of the second adhesive film is improved through a water blocking structure of three layers of hydrophobic-water absorbing-hydrophobic.

Drawings

Fig. 1 is a perspective view of a single-glass TOPCon battery assembly of the present application.

Fig. 2 is a schematic cross-sectional view showing the internal structure of a single-glass TOPCon battery module in example 1 of the present application.

Fig. 3 is a schematic cross-sectional view showing the internal structure of a single-glass TOPCon battery module in example 4 of the present application.

Fig. 4 is a schematic cross-sectional view showing the internal structure of a single-glass TOPCon battery module in example 6 of the present application.

Reference numerals illustrate: 1. glass; 2. a first adhesive film; 21. an EVA layer; 22. a POE layer; 3. TOPCon battery array; 4. a second adhesive film; 41. a first hydrophobic layer; 42. a water-absorbing layer; 43. a second hydrophobic layer; 5. a back plate.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-4.

Example 1

The embodiment of the application discloses a single-glass TOPCO battery assembly, referring to fig. 1, the single-glass TOPCO battery assembly is composed of glass 1, a first adhesive film 2, a TOPCO battery array 3, a second adhesive film 4 and a back plate 5 which are sequentially laminated.

Referring to fig. 2, the first adhesive film 2 comprises at least one EVA layer 21 and/or at least one POE layer 22. The first adhesive film 2 of this embodiment is composed of an EVA layer 21, a POE layer 22, and an EVA layer 21, which are sequentially connected.

Referring to fig. 2, the second adhesive film 4 is a transparent adhesive film or a white adhesive film, and a white filler is added to the white second adhesive film 4, wherein the white filler includes but is not limited to titanium dioxide, zirconium dioxide, zinc oxide, and the like. The second adhesive film 4 in this embodiment is white, the white filler is titanium dioxide, and the white second adhesive film 4 has the effect of reflecting light, so that the generated power can be increased. In this embodiment, the second adhesive film 4 is composed of a first hydrophobic layer 41, a water-absorbing layer 42 and a second hydrophobic layer 43 which are tightly combined in this order. The main materials of the second adhesive film 4 include, but are not limited to, EVA, POE, etc., in this embodiment, POE is selected as the main materials of the first hydrophobic layer 41 and the second hydrophobic layer 43, and EVA is selected as the main material of the water absorbing layer 42.

Referring to fig. 2, a first water-repellent layer 41 is attached to the TOPCon battery array 3, and a water-absorbent layer 42 is sandwiched between the first water-repellent layer 41 and a second water-repellent layer 43. The first and second

hydrophobic layers

41 and 43 can effectively prevent intrusion of moisture. Both the first hydrophobic layer 41 and the second hydrophobic layer 43 contain hydrophobic compounds including, but not limited to, octyltriethoxysilane, ethylene-glycidyl methacrylate-acrylic acid terpolymer, and the like, with octyltriethoxysilane being selected in this example.

Referring to fig. 2, the main material of the water-absorbing layer 42 contains a water-absorbing auxiliary agent, which includes, but is not limited to, polyacrylate and cellulose and derivatives thereof, so that the water-absorbing auxiliary agent provides the water-absorbing layer 42 with excellent water-absorbing and water-locking properties, thereby imparting water-absorbing properties to the second adhesive film 4, and enabling the second adhesive film 4 to absorb water vapor attempting to invade the interior of the single-glass TOPCon battery assembly, and blocking the water vapor from entering the interior of the TOPCon battery assembly. Cellulose and its derivatives include, but are not limited to, methylcellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxymethyl cellulose, cellulose acetate butyrate, cellulose acetate, and the like, and the water absorption aid of this embodiment is hydroxypropyl methylcellulose.

In summary, through the water blocking structure of the three layers of water blocking structure of water blocking, water absorbing and water blocking, the water blocking performance of the second adhesive film 4 is improved, so that the influence of water vapor on the TOPCO battery array 3 is reduced, and the water blocking performance and the attenuation resistance effect of the single-glass TOPCO battery assembly are improved.

Referring to fig. 2, the thickness of the second adhesive film 4 is in the range of 0.35-0.7mm, the thickness ratio of the first hydrophobic layer 41, the water absorbing layer 42 and the second hydrophobic layer 43 is 1 (1-5): 1, the total thickness of the second adhesive film 4 is moderate, the water blocking effect and the aging resistance are good, and the application in the field can be satisfied. And, when the thickness ratio of the three-layer structure of the second adhesive film 4 is in the above range, the water blocking performance and the aging resistance of the finally obtained second adhesive film 4 are excellent. The thickness of the second adhesive film 4 in this embodiment is 0.6mm, and the thickness ratio of the first hydrophobic layer 41, the water-absorbing layer 42 and the second hydrophobic layer 43 is 1:4:1.

Referring to fig. 2, the back plane 5 includes, but is not limited to, a TPT back plane, a TPE back plane, a KPK back plane, a KPE back plane, a KPF back plane, a PPE back plane, etc., with the TPT back plane being selected in this embodiment.

The implementation principle of the single-glass TOPCon battery assembly in the embodiment of the application is as follows: the EVA layer 21, POE layer 22 and EVA layer 21 are formed once by melt co-extrusion to obtain the first adhesive film 2. The first hydrophobic layer 41, the water absorption layer 42 and the second hydrophobic layer 43 are formed by melt co-extrusion for one time to obtain a second adhesive film 4; sequentially laying the glass 1, the first adhesive film 2, the TOPCO battery array 3, the second adhesive film 4 and the back plate 5 in a laminated mode to obtain a laminated and laid assembly, putting the laminated and laid assembly into a laminating machine for lamination, bonding all layers together to form a laminated piece, packaging and protecting the periphery of the laminated piece by using a frame (not shown), and bonding a junction box (not shown) on the back plate 5 to obtain the single-glass TOPCO battery assembly.

Example 2

A single-glass TOPCon battery module differs from example 1 in that, referring to fig. 2, EVA is selected as the main material of the first water-repellent layer 41 and the second water-repellent layer 43 in this embodiment, and POE is selected as the main material of the water-absorbent layer 42.

Example 3

The difference between the single-glass TOPCon battery module and the embodiment 1 is that, referring to fig. 2, no white filler is added to the second adhesive film 4, the second adhesive film 4 is transparent, the light transmittance is not less than 90%, and the transparent second adhesive film 4 is adapted to the back plate 5 with black or the same color as the battery piece, so that the single-glass TOPCon battery module is uniform in visual color and attractive.

Example 4

The difference between the single-glass TOPCon battery module and the embodiment 1 is that, referring to fig. 3, the second adhesive film 4 is composed of a first hydrophobic layer 41 and a water-absorbing layer 42 which are sequentially and tightly combined, the first hydrophobic layer 41 is attached to the TOPCon battery array 3, and the thickness ratio of the first hydrophobic layer 41 to the water-absorbing layer 42 is 1:4.

The implementation principle of the single-glass TOPCon battery assembly in the embodiment of the application is as follows: the EVA layer 21, POE layer 22 and EVA layer 21 are formed once by melt co-extrusion to obtain the first adhesive film 2. The first hydrophobic layer 41 and the water absorbing layer 42 are formed by melt co-extrusion for one time to obtain a second adhesive film 4; sequentially laying the glass 1, the first adhesive film 2, the TOPCO battery array 3, the second adhesive film 4 and the back plate 5 in a laminated mode to obtain a laminated and laid assembly, putting the laminated and laid assembly into a laminating machine for lamination, bonding all layers together to form a laminated piece, packaging and protecting the periphery of the laminated piece by using a frame (not shown), and bonding a junction box (not shown) on the back plate 5 to obtain the single-glass TOPCO battery assembly.

Example 5

A single-glass TOPCon battery module differs from example 4 in that, referring to fig. 3, EVA is selected as the main material of the first water-repellent layer 41 and POE is selected as the main material of the water-absorbent layer 42 in this embodiment.

Example 6

A single-glass TOPCon battery module is different from the embodiment 1 in that, referring to fig. 1 and 4, the second adhesive film 4 is a single-layer water-absorbing layer 42, and the main material of the water-absorbing layer 42 in this embodiment is EVA.

The implementation principle of the single-glass TOPCon battery assembly in the embodiment of the application is as follows: the EVA layer 21, POE layer 22 and EVA layer 21 are formed once by melt co-extrusion to obtain the first adhesive film 2. Sequentially laying the glass 1, the first adhesive film 2, the TOPCO battery array 3, the second adhesive film 4 and the back plate 5 in a laminated mode to obtain a laminated and laid assembly, putting the laminated and laid assembly into a laminating machine for lamination, bonding all layers together to form a laminated piece, packaging and protecting the periphery of the laminated piece by using a frame (not shown), and bonding a junction box (not shown) on the back plate 5 to obtain the single-glass TOPCO battery assembly.

Example 7

A single-glass TOPCon battery module differs from example 6 in that, referring to fig. 4, the main material of the water-absorbing layer 42 is POE.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. The utility model provides a single glass TOPCon battery pack, includes glass (1), first glued membrane (2), TOPCon battery array (3), second glued membrane (4) and backplate (5) that set gradually, its characterized in that: the second adhesive film (4) comprises a water absorbing layer (42) with water absorbing characteristics.

2. The single-glass TOPCon battery assembly of claim 1, wherein: the second adhesive film (4) comprises a first hydrophobic layer (41) tightly combined with a water absorption layer (42), and the first hydrophobic layer (41) is attached to the TOPCO battery array (3).

3. A single-glass TOPCon battery assembly according to claim 2, wherein: the thickness of the second adhesive film (4) is 0.35-0.7mm, and the thickness ratio of the first hydrophobic layer (41) to the water absorbing layer (42) is 1 (1-5).

4. A single-glass TOPCon battery assembly according to claim 2, wherein: the second adhesive film (4) further comprises a second hydrophobic layer (43) tightly combined with the water absorption layer (42), and the water absorption layer (42) is clamped between the first hydrophobic layer (41) and the second hydrophobic layer (43).

5. The single-glass TOPCon battery assembly of claim 4, wherein: the thickness of the second adhesive film (4) is 0.35-0.7mm, and the thickness ratio of the first hydrophobic layer (41), the water absorbing layer (42) and the second hydrophobic layer (43) is 1 (1-5): 1.

6. The single-glass TOPCon battery assembly of claim 1, wherein: the second adhesive film (4) is a transparent adhesive film or a white adhesive film.

7. The single-glass TOPCon battery assembly of claim 1, wherein: the first adhesive film (2) comprises at least one EVA layer (21) and/or at least one POE layer (22).

8. The single-glass TOPCon battery assembly of claim 1, wherein: the main material of the water absorbing layer (42) is EVA.