CN117497624A

CN117497624A - Photovoltaic module and preparation method thereof

Info

Publication number: CN117497624A
Application number: CN202311490699.XA
Authority: CN
Inventors: 陶武松; 陈振东; 王路闯; 郭志球; 张宁波; 石家乐
Original assignee: Jingke Energy Shangrao Co ltd; Jinko Solar Co Ltd
Current assignee: Jingke Energy Shangrao Co ltd; Jinko Solar Co Ltd
Priority date: 2023-11-09
Filing date: 2023-11-09
Publication date: 2024-02-02

Abstract

The embodiment of the application relates to the field of photovoltaics, and provides a photovoltaic cell and a preparation method thereof, wherein the preparation method of a photovoltaic module comprises the following steps: providing a plurality of connection members; applying a plurality of glue sites on the connecting member; providing a battery piece, wherein the battery piece is provided with a first boundary, a second boundary, a first boundary and a second boundary which are adjacently arranged, and the two first boundaries are opposite along a first direction, and the two second boundaries are opposite along a second direction; paving connecting parts with glue points on the surfaces of the battery pieces, wherein the connecting parts are sequentially arranged along a first direction, the glue points are positioned on the battery pieces and are adjacent to a second boundary, and the glue points are used for fixing the connecting parts and the battery pieces; paving a protective layer, wherein the protective layer is positioned on the surface of the battery piece and covers the plurality of connecting parts and the glue points; performing heat treatment on the protective layer to fix the protective layer, the connecting part and the battery piece; paving an encapsulation adhesive film and a cover plate on the surface of the protective layer; laminating treatment is performed.

Description

Photovoltaic module and preparation method thereof

Technical Field

The embodiment of the application relates to the field of photovoltaics, in particular to a photovoltaic module and a preparation method thereof.

Background

Solar cells are devices that directly convert light energy into electrical energy through a photoelectric effect or a photochemical effect. The single solar cell cannot be directly used for power generation. Several single batteries must be connected in series and parallel by welding strips and tightly packaged into a module for use. Solar cell modules (also called solar panels) are the core part of and the most important part of a solar power generation system. The solar cell module is used for converting solar energy into electric energy, or sending the electric energy to a storage battery for storage, or pushing a load to work.

The battery piece is very fragile, and the upper and lower surfaces of the battery assembly are generally required to be provided with adhesive films and cover plates so as to assemble the battery assembly into the photovoltaic assembly, wherein the adhesive films and the cover plates are used for protecting the battery piece. The cover plate is generally made of photovoltaic glass, the photovoltaic glass cannot be directly attached to the battery piece, and the adhesive film is required to be adhered in the middle. The connection between the battery cells typically requires a solder strip for collecting current, and conventional solder strips require alloying between the solder strip and the fine grid by welding during soldering. However, the melting point of the solder in the solder strip is generally high, and in the actual soldering process, the soldering temperature is 20 ℃ higher than the melting point of the solder. The battery piece is large in buckling deformation in the welding process, so that the hidden cracking risk after welding is large, and the breaking rate is high.

In the above background, in order to improve the welding quality, the low temperature solder strip and no main grid technology are generated. However, there are many factors that affect the yield of the photovoltaic module, such as the effect of welding between the solder strip and the fine grid, the yield of welding, and bubbles in the adhesive film.

Disclosure of Invention

The embodiment of the application provides a photovoltaic module and a preparation method thereof, which are at least beneficial to improving the yield of the photovoltaic module.

According to some embodiments of the present application, an aspect of embodiments of the present application provides a method for preparing a photovoltaic module, including: providing a plurality of connection members; applying a plurality of glue sites on the connecting member; providing a battery piece, wherein the battery piece is provided with a first boundary, a second boundary, a first boundary and a second boundary which are adjacently arranged, wherein the two first boundaries are opposite along a first direction, and the two second boundaries are opposite along a second direction; paving the connecting parts with the glue points on the surface of the battery piece, wherein the connecting parts are sequentially arranged along the first direction, the glue points are positioned on the battery piece, the glue points are adjacent to the second boundary, and the glue points are used for fixing the connecting parts and the battery piece; paving a protective layer, wherein the protective layer is positioned on the surface of the battery piece and covers the plurality of connecting parts and the glue points; performing heat treatment on the protective layer to fix the protective layer, the connecting part and the battery piece; paving an encapsulation adhesive film and a cover plate on the surface of the protective layer; laminating treatment is performed.

In some embodiments, after the battery piece is laid on the connecting member, the distance between the glue point and the second boundary along the second direction is a first distance, and the width of the battery piece along the second direction is a first width; the first distance is less than 1/10 times the first width.

In some embodiments, the battery sheet includes: a plurality of auxiliary grid lines sequentially arranged along the second direction; a connection gate line adjacent to the second boundary, the connection gate line being electrically connected to a plurality of N sub-gate lines adjacent to the second boundary; and the orthographic projection of the glue point on the battery piece is partially overlapped with the connecting grid line.

In some embodiments, the same connecting member includes at least a first glue dot and a second glue dot, the first glue dot is adjacent to one of the two second boundaries, and the second glue dot is adjacent to the other of the two second boundaries.

In some embodiments, in the process step of laying the connection member having the glue dot on the surface of the battery sheet, the glue dot is located between the connection member and the battery sheet; or the glue point is positioned on the surface of the connecting part far away from the battery piece.

In some embodiments, the protective layer has a plurality of processing regions; the processing area is not overlapped between the first orthographic projection of the battery piece and the second orthographic projection of the connecting component on the battery piece; the heat treatment process for the protective layer comprises the following steps: and carrying out heat treatment on the treatment area.

In some embodiments, the second distance between adjacent ones of the treatment zones is greater than or equal to 2 times the third distance of adjacent ones of the connection members along the first direction.

In some embodiments, the same cell, the total area of the plurality of processing regions is a first area, and the area of the cell is a second area; the ratio of the first area to the second area ranges from 10% to 30%.

In some embodiments, comprising: the plurality of battery pieces are arranged along the second direction, and the connecting parts are positioned on the surfaces of two adjacent battery pieces; the protective layer covers at least one surface of the battery piece.

In some embodiments, the protective layer is directly opposite and overlaps the battery cells.

According to some embodiments of the present application, there is also provided a photovoltaic module according to another aspect of the embodiments of the present application, including: the battery string is formed by connecting a plurality of battery pieces through connecting components; the battery piece is provided with two second boundaries which are oppositely arranged along the extending direction of the connecting part; the glue point is positioned on the battery piece and is adjacent to the second boundary; the packaging layer is used for covering the surface of the battery string; and the cover plate is used for covering the surface of the packaging layer, which is away from the battery strings.

The technical scheme provided by the embodiment of the application has at least the following advantages:

in the preparation method of the photovoltaic module, the protective layer is paved on the surface of the battery piece and covers a plurality of connecting parts, so that the technical problem of alignment between the protective layer and the connecting parts is solved, and the alignment difficulty between the protective layer and the connecting parts is reduced. In addition, the protective layer covers a plurality of connecting parts, and the protective layer can realize more comprehensive protection on the connecting parts, so that the follow-up packaging adhesive film is prevented from overflowing between the connecting parts and the battery. Before the protective layer is applied, glue points are applied to the connecting parts, the glue points are adjacent to the second boundary, and the connecting parts can be fixed by the glue points so as to avoid the influence on the precision due to sliding of the connecting parts in the laying process of the protective layer. The glue point is adjacent to the second boundary, so that the head and the tail of one connecting part on the same battery piece can be fixed to prevent the connecting part from shifting.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, which are not to be construed as limiting the embodiments unless specifically indicated otherwise; in order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the drawings that are required to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram corresponding to a connection component provided in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

FIG. 3 is a schematic cross-sectional view of the structure of FIG. 2 along the line A-A 1;

FIG. 4 is a schematic cross-sectional view of the structure of FIG. 2 along the section B-B1;

fig. 5 is a schematic structural diagram corresponding to a battery piece provided in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

FIG. 6 is a view taken along line a of FIG. 5 ₁ -a ₂ Schematic cross-sectional structure of the cross section;

fig. 7 is a schematic structural diagram of another embodiment of a method for manufacturing a photovoltaic module according to the present disclosure;

fig. 8 is a schematic structural diagram corresponding to a connection component with glue points paved on a battery piece in the preparation method of the photovoltaic module according to the embodiment of the present application;

FIG. 9 is a view of the graph of FIG. 8 along the line a ₁ -a ₂ Schematic cross-sectional structure of the cross section;

fig. 10 is a schematic cross-sectional structure diagram of another embodiment of a method for manufacturing a photovoltaic module according to the present disclosure, where the connecting member having glue points is laid on the battery piece;

fig. 11 is a schematic diagram of a first structure corresponding to a protective layer laid in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

FIG. 12 is a view taken along the line a of FIG. 11 ₁ -a ₂ Schematic cross-sectional structure of the cross section;

FIG. 13 is a view taken along b of FIG. 11 ₁ -b ₂ Schematic cross-sectional structure of the cross section;

fig. 14 is a schematic diagram of a second structure corresponding to a protective layer laid in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

FIG. 15 is a schematic cross-sectional view of the structure of FIG. 14 along section C-C1;

fig. 16 is a schematic diagram of a third structure corresponding to a protective layer laid in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

fig. 17 is a schematic diagram of a fourth structure corresponding to a protective layer laid in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

fig. 18 is a schematic structural diagram corresponding to a step of laying a packaging adhesive film and a cover plate in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

FIG. 19 is a view along the line a of FIG. 18 ₁ -a ₂ Schematic cross-sectional structure of the cross section;

FIG. 20 is a schematic view of a first cross-sectional structure of a photovoltaic module after lamination in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

FIG. 21 is a schematic diagram of a second cross-sectional structure of a photovoltaic module after lamination in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure;

fig. 22 is a schematic structural diagram corresponding to a battery piece provided in a method for manufacturing a photovoltaic module according to another embodiment of the present disclosure;

FIG. 23 is the view taken along line c of FIG. 22 ₁ -c ₂ A first cross-sectional structural schematic of the cross-section;

FIG. 24 is the view taken along the line c of FIG. 22 ₁ -c ₂ A second cross-sectional structural schematic of the cross-section;

fig. 25 is another schematic structural diagram corresponding to a battery sheet provided in a method for manufacturing a photovoltaic module according to another embodiment of the present disclosure;

fig. 26 is a schematic structural diagram corresponding to a connection component with glue points laid on a battery piece in the method for manufacturing a photovoltaic module according to another embodiment of the present disclosure;

FIG. 27 is the view taken along the line c of FIG. 26 ₁ -c ₂ Schematic cross-sectional structure of the cross-section.

Detailed Description

As known from the background art, the yield of the current photovoltaic module is poor.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, as will be appreciated by those of ordinary skill in the art, in the various embodiments of the present application, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.

Fig. 1 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; fig. 2 to 22 are schematic structural diagrams of a photovoltaic module corresponding to each step of the method for manufacturing a photovoltaic module according to an embodiment of the present application.

According to some embodiments of the present application, an aspect of the embodiments of the present application provides a method for manufacturing a photovoltaic module, which is used for improving a yield of the photovoltaic module.

Referring to fig. 1, both the steps of providing a plurality of connection members and providing a battery sheet with respect to the manufacturing method may be performed at the same time, so that the connection members having glue sites are laid on the surface of the battery sheet. In some embodiments, the provision of a plurality of connection members may be performed first, then the battery sheet is provided, and finally the connection members having glue sites are laid on the surface of the battery sheet. In some embodiments, the battery sheet may be provided first, then a plurality of connection members may be provided, and finally the connection members having glue sites may be laid on the surface of the battery sheet.

Referring to fig. 1 and 2, the preparation method includes: providing a plurality of connection members; a plurality of glue sites are applied to the connecting member.

In some embodiments, the connection members 13 are used to achieve interconnection between the battery cells 10 and to concentrate current transmission to elements external to the photovoltaic module. The connection part 13 includes a bus bar for connecting the photovoltaic cell string and the junction box, and an interconnection bar for connecting between the first cell and the second cell.

In some embodiments, the connection part 13 is a core-spun structure, and the connection part 13 includes a conductive layer and a solder layer coating the surface of the conductive layer. The conductive layer is the main conductive transport layer of the connection member 13, and thus the lower the resistivity of the conductive layer is, the smaller the electrical loss of the connection member 13 is, and the better the battery efficiency and the generated power are. The conductive layer is made of conductive materials with better conductivity such as copper, nickel, gold, silver and the like or alloy materials with low resistivity.

In some embodiments, the welding layer may be plated on the surface of the conductive layer or coated on the surface of the conductive layer, and specifically, the source material of the welding layer may be uniformly coated around the conductive layer according to a certain component proportion and thickness by using a special process such as electroplating, vacuum deposition, spraying or hot dip coating. The welding layer mainly serves to make the connection member 13 satisfy weldability, and to firmly weld the connection member 13 to the sub-grid 100 of the battery cell 10, thereby achieving good current guiding.

In some embodiments, the material of the solder layer is a metallic or alloy material having a lower melting point than the conductive layer, such as a tin alloy, which may include a tin-zinc alloy, a tin-bismuth alloy, or a tin-indium alloy. And the tin is used for welding a welding material, has a low melting point, has good affinity with metals such as copper and the like, and has good welding fastness. The lead in the tin-lead alloy can reduce the melting point of the welding strip, and the tin and the lead can form a eutectic point with the melting point of 183 ℃, so that the tin-lead alloy has good welding performance and usability. The embodiments disclosed herein reduce the melting point temperature and surface tension by replacing lead with other metallic elements or adding other elements to the tin-lead alloy, such as bismuth, the use of bismuth can reduce the melting point temperature. The melting point of the tin-bismuth alloy can be reduced to 139 ℃ to meet the requirement of low-temperature welding.

In some embodiments, the solder layer has a flux therein, which refers to a chemical substance that aids and facilitates the soldering process during the soldering process, while having a protective effect, preventing oxidation reactions. The flux includes an inorganic flux, an organic flux, and a resin flux. It will be appreciated that the flux has a melting point lower than that of the solder layer and increases fluidity of the solder layer in a molten state to provide good alloying of the solder layer with the sub-grid 100.

In some embodiments, the cross-section along the first direction Y of the connecting member 13 is circular in shape, and the circular solder strip is free from orientation problems and alignment problems, which is easier to mass produce.

In some embodiments, the cross-sectional shape of the connection member 13 may be triangular or any other shape to increase the contact area of the solder strip with the gate line structure and to reduce the problem of misalignment of the connection member 13 with the sub-gate line 100.

In some embodiments, the surface of the connecting member 13 remote from the battery cell 10 has a light reflective layer on the outer side of the solder layer remote from the conductive layer and the battery cell 10. The light reflecting layer serves to improve electrical loss due to the shielding area of the connection member 13 to the battery cell 10.

In some embodiments, the outer surface of the solder layer has reflective grooves, which are concave grooves or grooves facing the conductive layer from the solder layer, and sunlight is reflected onto the battery cells 10 through the sidewalls of the reflective grooves, thereby improving the utilization rate of sunlight.

In some embodiments, the glue sites 103 are fluid substances that have sufficient adhesive strength when the materials are in a liquid state, and when the materials are joined together, they are cured in a certain manner. Therefore, the glue is mostly water or other liquid solvents. The fluidity and adhesiveness of the liquid glue are stronger, and the air among the grid line structure, the connecting component 13 and the glue points 103 can be discharged as completely as possible, so that the conditions that the mechanical strength is poor, the grid line structure is easily broken and the performance of the grid line structure is influenced due to the fact that gaps are formed in the single solar photovoltaic cell can be prevented. The characteristics of the glue are beneficial to improving the yield of the photovoltaic module.

It will be appreciated that the glue sites 103 are not identical to adhesive tape or glue film, which refers to a new material compounded by the application of adhesive to a substrate, whereby the sealing and toughness of the tape itself does not allow the venting of air between the grid structure, the connecting members and the tape, and gaps exist between the grid structure, the connecting members and the tape, with the risk of breakage of the battery during subsequent lamination processes or other operations. The adhesive film refers to an epoxy type small molecule, an acrylic acid type small molecule or other active small molecules which are mutually combined through a high molecular reaction to form a film layer with a certain crosslinking degree and viscosity, the fluidity of the adhesive film is insufficient for exhausting gas, and the melting point of the adhesive film is possibly smaller than that of a packaging layer of a subsequent packaging process.

In some embodiments, the glue sites 103 are cured layers, which exhibit a lower fluidity of glue for the cured layers than for the non-cured layers, such that glue can be prevented from flowing between the connection member and the grid line structure, resulting in electrical insulation between the grid line structure and the connection member. The adhesiveness of the glue of the solidified layer is stronger than that of the glue of the non-solidified layer, and the glue can be used for enabling the connecting component to be adhered to the surface of the battery piece and preventing the connecting component from shifting. The compactness of the glue presenting the solidified layer is stronger than that of the glue of the non-solidified layer, a good isolation effect can be achieved, the packaging layer in a molten state is isolated from entering between the connecting part and the grid line structure, and meanwhile, moisture in air is isolated from corroding the grid line structure and the battery piece, so that the yield of the photovoltaic module is affected.

In some embodiments, the glue sites 103 before curing have a viscosity number in the range 8000-20000 mPa-s at a temperature of 25 ℃. The viscosity range of the glue point 103 is firstly used for enabling the glue to have certain fluidity and poor compactness before solidification, and air can be discharged, so that the glue film in a molten state can be prevented from flowing between the connecting part and the grid line structure due to the fact that the solidified glue is ejected by the follow-up air due to heat.

In some embodiments, the type of glue sites 103 includes acrylate glue, polymer glue, hot melt glue, or polymer glue. The type or the curing mode of the glue can be adjusted according to the actual requirement of the photovoltaic module, for example, the glue point 103 can be low-temperature glue, so that the curing temperature of the glue is lower, the thermal stress degree of the battery piece 10 is reduced, and the problems of thermal warping and the like caused by larger thermal stress of the battery piece are avoided.

Referring to fig. 5 and 7, the preparation method includes: the battery piece 10 is provided, and the battery piece 10 is provided with a first boundary 101, a second boundary 102, a first boundary 101 and a second boundary 102 which are adjacently arranged, wherein two first boundaries 101 are opposite along a first direction Y, and two second boundaries 102 are opposite along a second direction X.

In some embodiments, the battery plate 10 includes any one of, but is not limited to, a PERC cell, a PERT cell (Passivated Emitter and Rear Totally-diffused cell, a passivated emitter back surface full diffusion cell), a TOPCon cell (Tunnel Oxide Passivated Contact, tunnel oxide passivation contact cell), a HIT/HJT cell (Heterojunction Technology, heterojunction cell).

In some embodiments, the cell sheet 10 may be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-compound solar cell, which may be specifically a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenium solar cell, or a perovskite solar cell.

In some embodiments, the battery piece 10 is a full back electrode contact crystalline silicon solar cell (Interdigitated back contact, IBC), where the IBC cell refers to a back junction back contact solar cell structure in which positive and negative metal electrodes are arranged on the back surface of the cell in an interdigital manner, and the PN junction and the electrodes thereof are located on the back surface of the cell, that is, the electrodes of the emitter region and the base region of the IBC cell are all located on the back surface, and the front surface is not shielded by a grid line, so that the photoelectric conversion performance of the cell can be improved.

The battery sheet 10 is a whole battery or a sliced battery. A sliced cell refers to a cell sheet formed by cutting a complete whole cell. The cutting process comprises the following steps: laser grooving+cutting (Linear Spectral Clustering, LSC) process and thermal stress cell separation (TMC) process. In some embodiments, the sliced cells are half-cells, which may also be understood as half-sliced cells or half-cells. The half-cell assembly functions to increase the generated power by reducing the resistance loss. From ohm's law, solar cell interconnect electrical losses are proportional to the square of the current magnitude. After the battery is cut into two halves, the current is reduced by half, and the electric loss is reduced to one quarter of the full-size battery loss. The increase in the number of cells also correspondingly increases the number of cell gaps that help to boost the short circuit current through reflection from the back plate of the assembly. In addition, cutting the half cell assembly can optimize the width of the cell solder strip, which conventionally requires an optimized balance between increasing the solder strip width to reduce electrical losses and decreasing the solder strip width to reduce shading losses. And the half-cut battery assembly reduces battery loss, so that the width of the welding strip can be set thinner to reduce shading loss, and the battery efficiency and the power generation power consumption are improved. In some embodiments, the sliced cell may be a three-slice cell, a 4-slice cell, an 8-slice cell, or the like.

In some embodiments, the battery cell 10 includes a plurality of sub-grid lines 100 arranged at intervals along the first direction. The sub-grid lines 100 are used to collect photo-generated current in the solar cell body and lead to the outside of the cell.

The conventional battery sheet 10 includes a main grid line and an auxiliary grid line, the auxiliary grid line intersects with the extending direction of the main grid line, the auxiliary grid line is used for collecting current of the substrate, and the main grid line is used for collecting the current of the auxiliary grid line and transmitting the current to the welding strip. In some embodiments, the secondary gate line 100 is a secondary gate line, which may also be referred to as a secondary gate line, which is used to conduct current. The main grid line is not shown in the battery piece 10 provided in the embodiment of the application, that is, the battery piece 10 is of a design without the main grid, so that a carrier transport path is shortened, series resistance is reduced, a front light receiving area is increased, assembly power is improved, short-circuit current is improved, and the usage amount of grid line printing silver paste is reduced to reduce production cost.

In some embodiments, the sub gate line 100 includes a first electrode and a second electrode. The first surface of the battery sheet 10 has a first electrode, which is one of a positive electrode or a negative electrode, on the opposite side to the first surface, i.e., the second surface has a second electrode, which is the other of the positive electrode or the negative electrode. When the battery piece is an IBC battery, the first electrode and the second electrode are positioned on the same side of the battery piece.

In some embodiments, the battery sheet 10 includes a first battery sheet 11 and a second battery sheet 12.

Referring to fig. 8, the preparation method includes: the connecting parts 13 with the glue points 103 are paved on the surface of the battery piece, the connecting parts 13 are sequentially arranged along the first direction Y, wherein the glue points 103 are positioned on the battery piece, the glue points 103 are adjacent to the second boundary, and the glue points 103 are used for fixing the connecting parts 13 with the battery piece.

In some embodiments, the first battery cell 11 and the second battery cell 12 are connected in series or in parallel by the connection member 13, forming a battery string. The connection member 13 connects the first electrode of the first battery cell 11 and the second electrode of the adjacent second battery cell 12, or the connection member 13 connects the second electrode of the first battery cell 11 and the first electrode of the adjacent second battery cell 12.

In some embodiments, referring to fig. 9, the first surfaces of the first battery plate 11 and the second battery plate 12 are all facing the same side, and the second surfaces of the first battery plate 11 and the second battery plate 12 are all facing the same side, or the first electrodes of all battery plates 10 are facing the same side, and the connecting members 13 need to naturally extend from the first surfaces of the battery plates to the second surfaces of the adjacent battery plates, so that the connecting members 13 connect the first electrodes and the second electrodes of the adjacent battery plates.

In some embodiments, referring to fig. 10, the first and second battery pieces 11 and 12 are sequentially arranged in the order of the first surface, the second surface, the first surface, and the second surface, the connection member 13 is not bent, and the connection member 13 directly connects the first electrode of the first battery piece 11 and the second electrode of the second battery piece 12 adjacent thereto.

Wherein adjacent battery plates 10 shown in fig. 2 and 5 have a battery gap therebetween to achieve electrical insulation between the different battery plates 10. In some embodiments, there is no cell gap between adjacent cells, i.e., the cells are stacked.

In some embodiments, the region where one connection member 13 overlaps the battery cell 10 is an overlapping region including the region where the connection member 13 overlaps the sub-grid line 100.

In some embodiments, after the battery piece lays the connecting component, the distance between the glue point and the second boundary along the second direction is a first distance S1, and the width of the battery piece along the second direction is a first width W; the first distance S1 is less than 1/10 times the first width. The first distance S1 is smaller than 1/20 times the first width, the first distance S1 is smaller than 1/30 times the first width, the first distance S1 is smaller than 1/40 times the first width, the first distance S1 is smaller than 1/53 times the first width, the first distance S1 is smaller than 1/60 times the first width or the first distance S1 is smaller than 1/80 times the first width.

In some embodiments, in the process step of laying the connection component with the glue point on the surface of the battery piece, the glue point is located on the surface of the connection component far away from the battery piece, so that the glue point 103 has a small probability of being immersed between the grid line structure and the connection component, thereby reducing the connection component cold joint and the detachment of the connection component and the grid line structure caused by insufficient welding stress, and being beneficial to improving the yield of the photovoltaic module.

In some embodiments, the same connecting member includes at least a first glue dot adjacent to one of the two second boundaries and a second glue dot adjacent to the other of the two second boundaries. Therefore, the first glue point and the second glue point can fix the connecting parts opposite to the same battery piece near the head and the tail of the second boundary so as to prevent the connecting parts from shifting.

Referring to fig. 11, the preparation method includes: paving a protective layer 14, wherein the protective layer 14 is positioned on the surface of the battery piece, and the protective layer 14 covers a plurality of connecting parts and glue points 103; the protective layer 14 is heat-treated to fix the protective layer 14, the connection member 13, and the battery cell.

In some embodiments, the material of protective layer 14 includes an organic encapsulating film such as polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyethylene octene co-elastomer (POE) film, ethylene vinyl acetate copolymer (EVA) film, polyethylene (PE), or polyvinyl butyral ester (PVB) film.

In some embodiments, the thickness of the protective layer 14 ranges from 0.05mm to 2mm in a direction perpendicular to the cell surface. The thickness of the protective layer 14 may range from 0.05mm to 0.14mm, from 0.14mm to 0.2mm, from 0.2mm to 0.331mm, from 0.331mm to 0.558mm, from 0.558mm to 0.98mm, from 0.98mm to 1.38mm, from 1.38mm to 1.57mm, or from 1.57mm to 2mm. The thickness of the protective layer 14 is in any range, and the protective layer 14 can be used as the protective layer 14 to prevent the molten packaging film from flowing between the auxiliary grid line 100 and the connecting part 13; the protective layer 14 can be used as a supplementary layer of an encapsulation adhesive film or used as an encapsulation material in the lamination process to fill between the battery pieces 10 and between the connecting parts 13 and 13 so as to improve the sealing effect of the photovoltaic module. The thickness range of the protective layer 14 can also prevent the possibility of the connection member 13 penetrating the adhesive film, thereby improving the yield of the photovoltaic module.

In some embodiments, the protective layer 14 may be a single plastic film with a uniform thickness, so that the protective layer 14 may reduce the possibility that the connecting member 13 pierces the packaging plastic film for the area where the connecting member 13 is located, and may have a sufficient thickness range to exhibit tackiness at the processing area 141 for the non-overlapping area of the connecting member 13, i.e., the area where the connecting member 13 and the connecting member 13 are located, so as to fix the connecting member 13, the battery piece 10, and the protective layer 14.

It should be noted that, the "uniform thickness" of the protective layer 14 in a whole adhesive film with a uniform thickness does not mean that the thickness of the protective layer 14 at all positions is a fixed value, but means that the difference between the thicknesses of the protective layer 14 at all positions is ±5% and can be defined as a uniform thickness.

In some embodiments, the protective layer 14 may include a continuous first protective layer that is a protective layer that covers the surface of the connection member 13, and a second protective layer that is a protective layer that is not a protective layer that covers the surface of the connection member 13. The thickness of the first protection layer is greater than that of the first protection layer, the thickness difference can be 5% -7.8%, 7.8% -10%, 10% -13.2%, 13.2% -16.3%, 16.3% -20% or 20% -30% of that of the first protection layer, and the thickness of the first protection layer can be used for preventing the connecting component 13 from penetrating through the packaging adhesive film and the protection layer 14, so that the sealing performance of a subsequently formed photovoltaic module is affected, and the yield of the photovoltaic module is reduced. The thickness of the first protective layer can be limited to reduce the manufacturing cost of the photovoltaic module by limiting the thickness of the first protective layer on the premise of ensuring the success rate of the photovoltaic module and the functionality of the protective layer 14.

In some examples, the thickness of the first protective layer ranges from 0.05mm to 2mm. In some examples, the thickness of the first protective layer ranges from 0.05mm to 2mm.

In some embodiments, the protective layer 14 includes a plurality of sublayers along the thickness direction of the battery sheet; after the heat treatment is performed on the treatment area 141, the melt index of the sub-layer close to the battery sheet is smaller than that of the sub-layer far from the battery sheet. In this way, by combining the multiple sub-layers of the protective layer 14 and defining the functionality of the different sub-layers, the heat treatment time and the heat treatment temperature of the protective layer 14 are reduced, so that the flowability of the sub-layers except for the sub-layers near the battery pieces can be improved by defining the dissolution index of the sub-layers near the battery pieces, so that the protective layer 14 can be filled between the battery pieces, and the tightness of the photovoltaic module is improved.

The specific operation process of the melt flow index test can be as follows: the high polymer (sub-layer adhesive film) raw material to be measured is placed in a small groove, the groove is connected with a thin pipe, the diameter of the thin pipe is 2.095mm, and the length of the pipe is 8mm. After heating to a certain temperature (generally 190 ℃ or the melting point temperature of the polymer raw material is +20 ℃), the upper end of the raw material is downwards extruded by a piston under a certain weight, and the extruded weight of the raw material within 10 minutes is measured to obtain the flow index M1 or the melt index of the plastic; the unit is g/10min. Generally, the larger M1 represents the smaller the viscosity and the smaller the molecular weight of the polymer raw material, whereas the larger the viscosity and the larger the molecular weight of the polymer raw material. The greater the viscosity, the poorer the flowability.

In some embodiments, referring to fig. 11 or 12, a photovoltaic module includes: a plurality of battery pieces 10 arranged along a second direction X, the connection members being located at the surfaces of two adjacent battery pieces; the protective layer 14 covers at least one of the cell surfaces.

In some embodiments, referring to fig. 11 or fig. 12, the protective layer 14 is opposite to and overlapped with the battery piece (for example, the first battery piece 11 or the second battery piece 12), that is, the size of the protective layer 14 is identical to the size and shape of the battery piece, firstly, bubbles on the surface of the battery piece can be discharged through the gaps, so that a series of problems caused by glue shortage are avoided, secondly, the packaging adhesive film with better fluidity is located between the battery piece and the gap between the battery piece and the protective layer 14, compared with the gap between the battery piece and the battery piece, the fluidity of the packaging adhesive film is better, and the interface gap between the packaging adhesive film and the protective layer 14 is not formed at the gap, so that the strength is lower, the friction force is smaller, the damage to the battery piece and the welding strip is smaller, and the damage rate of the battery piece is reduced. In some embodiments, the protective layer 14 is located in the cell gap between the cells.

In some embodiments, referring to fig. 14, the protective layer 14 has a plurality of processing regions 141; the processing region 141 does not overlap between the first orthographic projection of the battery sheet and the second orthographic projection of the connecting member on the battery sheet; the second distance S2 between adjacent processing regions 141 is greater than or equal to 2 times the third distance S3 of adjacent connecting members in the first direction. Thus, on the one hand, the embodiment of the application can realize the fixation of the protective layer 14, the connecting component and the battery piece by performing heat treatment on the treatment area 141, so that the local heating can be realized for the arrangement of the treatment area 141, too much heat treatment on the battery piece can be avoided, and the melted protective layer 14 and the packaging adhesive film overflow between the battery piece and the connecting component.

It should be noted that the second distance S2 shown in fig. 14 is a straight line distance between the midpoints of the processing regions 141 along the first direction Y. In some embodiments, the second distance S2 may be a linear distance between two opposite sides of the two processing regions 141 in the first direction Y, wherein the linear distance may include any of a maximum distance and a minimum distance, including a maximum distance and a minimum distance.

Similarly, the third distance S3 shows a linear distance between axes of adjacent connection members in the first direction Y. In some embodiments, the third distance S3 may be a linear distance between two opposite sides of two adjacent connection members in the first direction Y, wherein the linear distance may include any of a maximum distance and a minimum distance, including a maximum distance and a minimum distance.

Wherein the non-overlapping of the processing region 141 between the first orthographic projection of the battery sheet and the second orthographic projection of the connecting member between the battery sheet may include the non-overlapping between the first orthographic projection and the overlapping region.

In some embodiments, the same battery cell 10, the total area of the plurality of processing regions 141 is a first area, and the area of the battery cell 10 is a second area; the ratio of the first area to the second area ranges from 10% to 30%. The ratio may be 29%, 21.5%, 23.9%, 21.5%, 18%, 11.2%, 15%, 13.1% or 10%. The ratio of the total area of the plurality of processing regions 141 to the total area of the battery piece 10 is within any range or value, the area ratio of the processing regions 141 to the non-processing regions is small, so that the area of the protective layer 14 opposite to the battery piece 10 is mostly the non-processing region, and the area or coverage of the battery piece 10 and the processing regions 141 is small, thus, less improvement can be performed on the protective layer 14, namely, most of the area of the protective layer 14 is not processed, and the preparation cost is reduced. The total area of the processing regions 141 is smaller, and thus the area of the heat treatment to which the entire battery sheet 10 is subjected is smaller, and the film structure inside the battery sheet 10 is not changed in series due to the problem of the heat treatment, thereby improving the battery efficiency of the battery sheet 10. Among them, a series of changes may include a problem that a film layer having a doping element has a decrease in doping concentration due to the temperature of heat treatment or conversion of an amorphous silicon material into a polysilicon material, or the like.

In contrast, when the ratio of the total area of the plurality of processing regions 141 to the total area of the battery sheet 10 is greater than 50%, the duty ratio of the processing regions 141 in the whole battery sheet 10 is too large, so that the air at the gap between the connection member and the battery sheet 10 cannot be completely exhausted, thereby affecting the yield of the photovoltaic module. Moreover, the non-processing area occupies a relatively small amount, the mobility of the protective layer 14 opposite to the battery piece 10 is crossed, so that the battery piece 10 cannot completely fill all gaps and gaps between the connecting component and the battery piece 10, and thus empty glue or voids exist, so that the strength of the photovoltaic module is reduced, and the yield of the photovoltaic module is reduced.

In some embodiments, the M treatment zones 141 are arranged in sequence along the extension direction X of the connection member; wherein M ranges from 2 to 20.M may be 2, 5, 8, 12, 15, 17 or 20. The number of the processing regions 141 is within the above-mentioned arbitrary value or range, and the heat-treated protective layer 14 can effectively prevent the movement of the connection member, thereby causing a problem of poor appearance such as cold joint or offset in the subsequent lamination process.

The number of the processing areas 141 is within any value or any range, a certain interval is formed between the processing areas 141 and 141, namely, a protective layer 14 of a non-processing area is further formed between the processing areas 141 and 141, so that air at a gap defined by the connecting component, the battery piece 10 and the protective layer 14 can be discharged, the strength and the sealing performance of the photovoltaic module are improved, and the risk of jacking up the protective layer 14 and the packaging adhesive film due to heating of air can be effectively avoided.

In some embodiments, referring to fig. 16, along the extending direction X of the connection member, the distance between two adjacent processing regions 141 is a first distance L1, the width of the battery piece 10 is a first width W (referring to fig. 7), and the ratio of the first distance L1 to the first width W ranges from 0.05 to 0.9. The ratio of the first spacing L1 to the first width W ranges from 0.05 to 0.16, from 0.16 to 0.35, from 0.35 to 0.52, from 0.52 to 0.7, from 0.7 to 0.83 or from 0.83 to 0.9. The ratio of the first pitch L1 to the first width W is in an arbitrary range, and the heat-treated protective layer 14 can effectively prevent the movement of the connection member, thereby causing a problem of poor appearance such as cold joint or offset in the subsequent lamination process.

The ratio of the first spacing L1 to the first width W is in any range, so that the spacing between the processing areas 141 and 141 is relatively suitable, that is, the processing areas 141 and 141 are provided with the protective layer 14 of the non-processing area, so that air at a gap defined by the connecting component, the battery piece 10 and the protective layer 14 can be discharged, the strength and the tightness of the photovoltaic module are improved, and the risk of jacking up the protective layer 14 and the packaging adhesive film due to heating of air can be effectively avoided.

Note that the first pitch L1 shown in fig. 16 shows a linear distance between midpoints of the processing region 141 along the extending direction X of the connection member. In some embodiments, the first distance L1 may be a linear distance between two opposite sides of the two processing regions 141 along the extension direction X of the connection part, wherein the linear distance may include any of a maximum distance and a minimum distance, including a maximum distance and a minimum distance.

In some embodiments, at least one processing region 141 is adjacent to the second boundary 102. Therefore, after the heat treatment is performed on the treatment area 141 adjacent to the second boundary 102, the area of the connecting component close to the second boundary 102 can be adhered, so that the two ends of the connecting component are fixed, and the end part of the connecting component close to the second boundary 102 cannot deviate, so that the problem of cold joint caused by deviation of the connecting component is reduced.

The area of the connection member near the second boundary 102 is fixed by the protective layer 14, and thus the molten state may not simply be immersed between the connection member and the battery cell 10 through the second boundary 102, thereby improving the electrical performance between the connection member and the grid line structure and improving the yield of the photovoltaic module.

In some embodiments, in the first direction Y, referring to fig. 14, the processing region 141 is a second distance L2 from the connection member 13; the ratio of the second distance L2 to the third distance S3 ranges from 0.3 to 0.7. The ratio of the second distance L2 to the third distance S3 ranges from 0.3 to 0.46, from 0.46 to 0.55, from 0.55 to 0.62 or from 0.62 to 0.7.

It should be noted that, the second pitch L2 shown in fig. 14 is a linear distance between the midpoint of the processing region 141 and the axis of the connecting member along the first direction Y. In some embodiments, the second distance L2 may be a linear distance between one side of the processing region 141 and an axis of the connection member in the first direction Y, wherein the linear distance may include any of a maximum distance and a minimum distance, including a maximum distance and a minimum distance.

In some embodiments, the second spacing L2 is equal to 1/2 times the third distance S3.

In some embodiments, referring to fig. 17, adjacent processing regions 141 are arranged offset from each other along the extension direction X of the connection member.

In some embodiments, referring to fig. 15, if the battery sheet 10 is a non-IBC battery, the battery sheet 10 may have two protective layers 14 on opposite first and second sides, at least one protective layer 14 having a treatment region 141 as described in any of the embodiments above. If the battery cell 10 is an IBC battery, the side of the battery cell 10 having the grid line structure has the protective layer 14 described in the above embodiment.

In some embodiments, the heat treatment may include an infrared heat treatment or any heat treatment, so that small molecules in the adhesive film of the treatment area 141 in the protective layer 14 are agglomerated into large molecules, thereby changing the crosslinking degree and the tackiness of the adhesive film itself.

By way of illustration, the degree of crosslinking of the non-heat-treated protective layer 14 is greater than or equal to 0, and the present embodiment does not limit the degree of crosslinking of the non-heat-treated protective layer 14, but only requires that the degree of crosslinking of the non-heat-treated protective layer 14 is less than the degree of crosslinking of the protective layer 14 in the heat-treated region 141.

In addition, the degree of crosslinking of the encapsulation layer in the photovoltaic module after the lamination process is greater than the degree of crosslinking of the protective layer 14 that has not been subjected to the heat treatment and greater than the degree of crosslinking of the protective layer 14 in the treated region 141, and not only the degree of crosslinking of the protective layer 14 in the non-treated region but also the degree of crosslinking and the properties of the protective layer 14 in the treated region 141 are changed during the lamination process.

In some embodiments, the degree of crosslinking of the protective layer 14 of the heat treated region 141 is less than or equal to 50%. The degree of crosslinking in treated area 141 is less than or equal to 48%, 46.5%, 43.3%, 40.2%, or 38.3%. The degree of cross-linking of the treated region 141 may be 50%, 48.1%, 47.2%, 43.1%, 41.1%, 36.7%, 37.1%, 35%, or 30.4%.

In some embodiments, the protective layer 14 of the heat treated region 141 has a cross-linking degree in a range of more than 10% and less than 30%. The degree of cross-linking of the treated region 141 may be 15%, 17.3%, 18.3%, 21.2%, 23.3%, 26.7%, 27.1%, 28%, or 29.4%.

The cross-linking degree of the processing region 141 is in any range, and the processing region 141 has good adhesion, so that the relative position between the connecting component and the battery piece is fixed, the connecting component is prevented from being deviated in the lamination process, and the yield of the photovoltaic module is reduced.

The cross-linking degree of the processing area 141 is not too large, and the lamination problem during lamination treatment is possibly larger than the melting point of the processing area 141, so that the packaging adhesive film cannot perfectly fill the gap between the battery piece 10 and the connecting component, and in the subsequent process, the problems of poor conditions such as the ejection of the packaging adhesive film and the like and the reduction of the strength of the photovoltaic module due to the thermal expansion of air in the gap occur, and the yield and the strength of the photovoltaic module are reduced.

The high degree of crosslinking in the treatment area 141 also causes an increase in viscosity and a decrease in toughness of the treatment area 141, and the increase in viscosity results in an inability of discharging air located on the surface of the battery sheet 10, thereby reducing the yield of the photovoltaic module; the toughness is reduced, so that the packaging adhesive film can be propped through by the connecting part, or the problems of fragments and the like can occur.

In some embodiments, the entire protective layer may be heat treated.

Referring to fig. 18, the preparation method includes: paving an encapsulation adhesive film and a cover plate on the surface of the protective layer; laminating treatment is performed.

In some embodiments, the material of the encapsulating film 106 includes an organic encapsulating film such as EVA, POE, or PVB.

In some embodiments, the encapsulating film 106 includes a first encapsulating film and a second encapsulating film, and the material of any one of the first encapsulating film and the second encapsulating film includes an organic encapsulating film such as EVA, POE, or PVB.

In some embodiments, the material of the protective layer 14 is the same as the material of the encapsulation film 106. Therefore, the interface state defect of the contact area between the packaging adhesive film and the protective layer 14 is less, the tightness of the photovoltaic module after the subsequent lamination treatment is ensured, and the photovoltaic module has good water-gas isolation performance.

In some embodiments, during the lamination process, the material of the protective layer 14 is the same as that of the packaging film 106, and the packaging film and the protective layer 14 can construct an integral packaging layer 15 after the lamination process, and no interface state or hybridization between molecules exists in each part of the packaging layer 15, so that the packaging layer 15 after the lamination process is an integral body formed by a single substance, and the performance is more stable and uniform, thereby effectively isolating moisture.

In some embodiments, the melting point of the encapsulating film 106 is less than the laminating temperature during the lamination process, the encapsulating film 106 is a film layer formed by the molecules in a cross-linked state formed by the small molecules in the film combined with each other due to the initiator in the encapsulating film 106 when the film is in a molten state at the temperature of the laminator.

In some embodiments, the melting point of the packaging film 106 and the melting point of the connecting component 13 can be set according to practical requirements. When the melting point of the packaging film 106 is greater than that of the connecting component 13, the connecting component 13 can realize alloying before the packaging film 110 is in a molten state, so that the molten packaging film 106 can be effectively prevented from being immersed into the auxiliary grid line 100 and the connecting component 13 and pushing the connecting component 13 to cause deflection. When the melting point of the packaging adhesive film 106 is smaller than that of the connecting component 13, the laminating temperature can be set to be lower, so that the thermal stress of the battery piece 10 is improved, and the yield of the photovoltaic module is improved.

In some embodiments, the cover 14 may be a glass cover, a plastic cover, or the like having a light-transmitting function. Specifically, the surface of the cover plate 14 away from the encapsulating film 106 may be a concave-convex surface, so as to increase the utilization rate of the incident light. The cover 14 includes a first cover plate opposite to the first surface of the battery cell 10 and a second cover plate opposite to the second surface of the battery cell 10.

In some embodiments, the melt index of the encapsulating film 106 is greater than or equal to the melt index of the protective layer 14 at the reaction temperature of the lamination process. In this way, the protective layer 14 can isolate the molten encapsulating film 106 from immersing into the sub-gate line 100 and the connection member 13 and pushing the connection member 13 to be offset.

Correspondingly, the preparation method of the photovoltaic module provided by the other embodiment of the application is basically the same as that provided by the embodiment, and the difference is that the battery europaea is provided with a connecting grid line, and the glue point is positioned between the connecting component and the battery piece. The same or corresponding technical features as those of the above embodiment are not described herein.

Fig. 22 to 27 are schematic structural diagrams of a photovoltaic module corresponding to partial steps in a method for manufacturing a photovoltaic module according to another embodiment of the present application.

Referring to fig. 22, the preparation method includes: providing a plurality of connection members 23; a plurality of glue sites 203 are applied to the connecting member 23. The battery piece 20 is provided, and the battery piece 20 is provided with a first boundary 201, a second boundary 202, a first boundary 201 and a second boundary 202 which are adjacently arranged, wherein two first boundaries 201 are opposite along a first direction Y, and two second boundaries 202 are opposite along a second direction X.

In some embodiments, the battery sheet 20 includes: a plurality of sub-gate lines 200 sequentially arranged along the second direction X; a connection gate line 204, the connection gate line 204 being adjacent to the second boundary 202, the connection gate line 204 being electrically connected to the plurality of N sub-gate lines 200 adjacent to the second boundary 202; the orthographic projection of the glue dot 203 on the battery piece 20 is partially overlapped with the connecting grid line 204.

In some embodiments, referring to fig. 23, the material of the connection gate line 204 is the same as the material of the sub gate line 200, and the material of the connection gate line 204 is prepared in the same printing process as the sub gate line 200.

In some embodiments, referring to fig. 24, the material of the connection gate line 204 is different from the material of the sub gate line 200.

In some embodiments, the length of the connection gate line 204 along the second direction X ranges from 8um to 60um. The length of the connection gate line 204 may be 8um to 20um, 20um to 35um, 35um to 50um, 50um to 60um, 28um to 55um, 13um to 52um, or 22um to 45um. The length of the connection gate line 204 may be 10.3um, 21.8um, 32.7um, 43.6um, 55.8um, or 60um.

In some embodiments, the width of the connection gate line 204 along the first direction Y ranges from 2mm to 50mm. The width of the connection gate line 204 may be 2mm to 10mm, 10mm to 20mm, 20mm to 30mm, 30mm to 40mm, 40mm to 50mm, 16mm to 28mm, or 19mm to 50mm. The width of the connection gate line 204 may be 2mm, 18mm, 21mm, 33mm, 35mm, 42mm, 46mm, or 50mm.

In some embodiments, N satisfies: n is more than or equal to 2 and less than or equal to 12. Thus, the welding area between the battery piece and the welding strip can be increased by the connecting grid line 204, and the welding tension between the battery piece and the connecting component can be increased by the connecting grid line 204, so that the welding effect between the battery piece and the welding strip is improved. The connection gate line 204 connects only a part of the sub-gate lines 200, not all of the sub-gate lines 200, so that the covered area of the surface of the substrate is small, thereby improving the cell efficiency of the solar cell. The connection grid line 204 is positioned at the end of the substrate, so that the current collection capability of the end of the substrate can be improved, and the battery efficiency can be improved.

Referring to fig. 26, the preparation method includes: and paving connecting parts with glue points on the surfaces of the battery pieces, wherein the connecting parts are sequentially arranged along the first direction, the glue points are positioned on the battery pieces and are adjacent to the second boundary, and the glue points are used for fixing the connecting parts and the battery pieces.

In some embodiments, in the process step of laying the connection member having the glue sites on the surface of the battery sheet, the glue sites are located between the connection member and the battery sheet.

The preparation method comprises the following steps: paving a protective layer, wherein the protective layer is positioned on the surface of the battery piece and covers the plurality of connecting parts and the glue points; and carrying out heat treatment on the protective layer to fix the protective layer, the connecting part and the battery piece. The preparation method comprises the following steps: paving an encapsulation adhesive film and a cover plate on the surface of the protective layer; laminating treatment is performed.

Wherein the battery pieces comprise a first battery piece 21 and a second battery piece 22.

Accordingly, referring to fig. 20, according to some embodiments of the present application, another aspect of embodiments of the present application further provides a photovoltaic module, including: a battery string formed by connecting a plurality of battery pieces through a connecting member 13; wherein, the battery piece is provided with two second boundaries 102 which are oppositely arranged along the extending direction of the connecting part; the glue point 103, the glue point 103 is located on the battery piece 10, and the glue point 103 is adjacent to the second boundary; an encapsulation layer 15 for covering the surface of the battery string; a cover plate 16 for covering the surface of the encapsulation layer 15 facing away from the battery string.

In some embodiments, the battery cell 10 is a whole cell or a sliced cell.

In some embodiments, the sub gate line 100 includes a first electrode and a second electrode. When the battery sheet 10 includes, but is not limited to, any of a PERC battery, a PERT battery, a TOPCon battery, a HIT/HJT battery. The first surface of the battery sheet 10 has a first electrode, which is one of a positive electrode or a negative electrode, on the opposite side to the first surface, i.e., the second surface has a second electrode, which is the other of the positive electrode or the negative electrode. When the battery piece is an IBC battery, the first electrode and the second electrode are positioned on the same side of the battery piece.

In some embodiments, the connection members 13 are used to achieve interconnection between the battery cells 10 and to concentrate current transmission to elements external to the photovoltaic module. The connection part 13 includes a bus bar for connecting the photovoltaic cell string and the junction box, and an interconnection bar for connecting between the first cell 11 and the second cell 12.

In some embodiments, the connection member 13 connects the first electrode of the first battery cell 11 and the second electrode of the adjacent second battery cell 12, or the connection member 13 connects the second electrode of the first battery cell 11 and the first electrode of the adjacent second battery cell 12.

Wherein, the adjacent battery plates 10 shown in fig. 5 and 8 have a battery gap therebetween to achieve electrical insulation between the different battery plates 10. In some embodiments, there is no cell gap between adjacent cells, i.e., the cells are stacked.

In some embodiments, after the battery piece lays the connecting component, the distance between the glue point and the second boundary along the second direction is a first distance, and the width of the battery piece along the second direction is a first width W; the first distance S1 is less than 1/10 times the first width.

In some embodiments, the same connecting member includes at least a first glue dot adjacent to one of the two second boundaries and a second glue dot adjacent to the other of the two second boundaries.

In some embodiments, the material of the encapsulation layer 15 includes PET, PVC, POE, EVA, PE or organic encapsulation films such as PVB films.

In some embodiments, referring to fig. 20, the encapsulation layer 15 is a monolithic adhesive film without significant delamination,

in some embodiments, referring to fig. 21, the encapsulation layer 15 includes an encapsulation film 106 and a protective layer 14, wherein the interface between the encapsulation film 106 and the protective layer 14 is not a distinct film boundary, thereby using wavy lines as the boundary of the two.

In some embodiments, the material of the protective layer 14 includes PET, PVC, POE, EVA, PE or organic encapsulation films such as PVB films.

The material of the encapsulating adhesive film 106 comprises EVA, POE or PVB organic encapsulating adhesive film.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of implementing the present application and that various changes in form and details may be made therein without departing from the spirit and scope of the present application. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention shall be defined by the appended claims.

Claims

1. A method of manufacturing a photovoltaic module, comprising:

Providing a plurality of connection members;

applying a plurality of glue sites on the connecting member;

providing a battery piece, wherein the battery piece is provided with a first boundary, a second boundary, a first boundary and a second boundary which are adjacently arranged,

wherein the two first boundaries are opposite along a first direction, and the two second boundaries are opposite along a second direction;

paving the connecting parts with the glue points on the surface of the battery piece, wherein the connecting parts are sequentially arranged along the first direction, the glue points are positioned on the battery piece, the glue points are adjacent to the second boundary, and the glue points are used for fixing the connecting parts and the battery piece;

paving a protective layer, wherein the protective layer is positioned on the surface of the battery piece and covers the plurality of connecting parts and the glue points;

performing heat treatment on the protective layer to fix the protective layer, the connecting part and the battery piece;

paving an encapsulation adhesive film and a cover plate on the surface of the protective layer;

laminating treatment is performed.

2. The method of manufacturing a photovoltaic module according to claim 1, wherein after the cell sheet is laid with the connection member, a distance between the glue dot and the second boundary in the second direction is a first distance, and a width of the cell sheet in the second direction is a first width; the first distance is less than 1/10 times the first width.

3. The method of manufacturing a photovoltaic module according to claim 1, wherein the battery sheet comprises: a plurality of auxiliary grid lines sequentially arranged along the second direction; a connection gate line adjacent to the second boundary, the connection gate line being electrically connected to a plurality of N sub-gate lines adjacent to the second boundary; and the orthographic projection of the glue point on the battery piece is partially overlapped with the connecting grid line.

4. The method of claim 1, wherein the same connecting member includes at least a first glue dot and a second glue dot, the first glue dot being adjacent to one of the two second boundaries, the second glue dot being adjacent to the other of the two second boundaries.

5. The method for manufacturing a photovoltaic module according to claim 1, wherein in the process step of laying the connection member having the glue dot on the surface of the battery sheet, the glue dot is located between the connection member and the battery sheet;

or the glue point is positioned on the surface of the connecting part far away from the battery piece.

6. The method of manufacturing a photovoltaic module according to claim 1, wherein the protective layer has a plurality of treatment zones; the processing area is not overlapped between the first orthographic projection of the battery piece and the second orthographic projection of the connecting component on the battery piece; the heat treatment process for the protective layer comprises the following steps: and carrying out heat treatment on the treatment area.

7. The method of manufacturing a photovoltaic module according to claim 1, wherein a second distance between adjacent ones of the processing regions in the first direction is greater than or equal to 2 times a third distance between adjacent ones of the connection members.

8. The method of manufacturing a photovoltaic module according to claim 1, wherein the total area of the plurality of processing regions of the same cell sheet is a first area, and the area of the cell sheet is a second area; the ratio of the first area to the second area ranges from 10% to 30%.

9. The method of manufacturing a photovoltaic module according to claim 1, comprising: the plurality of battery pieces are arranged along the second direction, and the connecting parts are positioned on the surfaces of two adjacent battery pieces; the protective layer covers at least one surface of the battery piece.

10. The method of manufacturing a photovoltaic module according to claim 9, wherein the protective layer is directly opposite to and overlaps the battery sheet.

11. A photovoltaic module, comprising:

the battery string is formed by connecting a plurality of battery pieces through connecting components; the battery piece is provided with two second boundaries which are oppositely arranged along the extending direction of the connecting part;

The glue point is positioned on the battery piece and is adjacent to the second boundary;

the packaging layer is used for covering the surface of the battery string;

and the cover plate is used for covering the surface of the packaging layer, which is away from the battery strings.