CN109841698B - Solar cell and application thereof - Google Patents
Solar cell and application thereof Download PDFInfo
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- CN109841698B CN109841698B CN201910068451.1A CN201910068451A CN109841698B CN 109841698 B CN109841698 B CN 109841698B CN 201910068451 A CN201910068451 A CN 201910068451A CN 109841698 B CN109841698 B CN 109841698B
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Abstract
The invention provides a solar cell, comprising: a front side, a back side, and a pair of oppositely disposed side surfaces; the pair of side surfaces includes a first side surface and a second side surface; a first insulating layer and a first conducting layer are sequentially arranged on the first side face from inside to outside; a second insulating layer and a second conducting layer are sequentially arranged on the second side surface from inside to outside; the first conductive layer is provided with a front extension part as a front electrode; the second conductive layer is provided with a back surface extension portion as a back surface electrode. When the battery pieces are tiled and connected in series to prepare the battery string, two adjacent battery pieces can be connected in series through the conductive connecting piece, and the conductive connecting piece can be only arranged in the gap between the two adjacent battery pieces and does not need to extend to the front side of the battery pieces, so that the conductive connecting piece can be prevented from shielding the sunlight on the front side of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved.
Description
Technical Field
The invention relates to a solar cell and application thereof.
Background
Solar modules (also called solar panels, photovoltaic modules) are the core part of solar power generation systems.
The solar cell module is a minimum indivisible solar cell combination device which has external packaging and internal connection and can independently provide direct current output, and mainly comprises a solar cell, tempered glass, EVA (ethylene vinyl acetate), a back plate, a frame and the like.
The manufacturing method of the solar cell module mainly comprises the following steps: the battery plates are connected in series, the components are stacked, the components are laminated, and the frame is installed.
Wherein, the battery piece is connected in series mainly: sequentially tiling and connecting a plurality of battery pieces in series along a certain arrangement direction, and connecting the plurality of battery pieces in series into a battery string; the back surface (back electrode) of the next cell is connected with the front surface (front electrode) of the previous cell in series through the conductive connecting piece; or the front surface (front electrode) of the latter cell is connected with the back surface (back electrode) of the former cell in series through the conductive connecting piece; the conductive connection is typically a wire or ribbon.
The assembly stack is mainly: and sequentially laminating and laying toughened glass, EVA, a battery string, EVA and a back plate.
The assembly lamination is mainly: and (3) bonding and fusing the laminated assemblies together under certain temperature and pressure conditions through hot pressing to form a whole.
As described above, two adjacent tiled battery pieces in the battery string need to be connected in series through the conductive connecting piece, and the conductive connecting piece needs to be connected with the front surface (front electrode) of one of the battery pieces, so the conductive connecting piece can block the light receiving area on the front surface of the battery piece (i.e. block the sunlight on the front surface of the battery piece), and the efficiency of the battery piece and the assembly is affected.
Moreover, two ends of each conductive connecting piece are fixedly connected (e.g. welded) with corresponding electrodes of two adjacent battery pieces, which greatly increases the working hours and cost for connecting the battery strings in series.
In addition, the conductive connecting pieces are adopted to be connected in series, and a certain distance needs to be set between every two adjacent tiled battery pieces, so that the tiled battery pieces cannot be densely arranged, the area of a component is wasted, and the efficiency of the component is influenced.
In addition, at present, a plurality of battery pieces are generally connected in series to form a battery string, and then the battery string connected in series is transferred to a component laminating station to be laid.
In the process of transferring the cell strings, the cell pieces are easily influenced by external force to increase the hidden crack probability, and the hidden crack of the cell pieces can influence the performance of the solar cell module.
Moreover, during the transfer of the battery string, the conductive connecting member will bear a certain tensile force, and the serial connection part (the connection part between the conductive connecting member and the battery piece) will also bear a certain tensile force, if the tensile strength of the conductive connecting member is not sufficient, the conductive connecting member may be torn or broken during the transfer of the battery string, if the tensile strength of the serial connection part is not sufficient, the conductive connecting member and (the electrode on) the battery piece may become a virtual connection or even be separated, even the electrode may be damaged, which may seriously affect the performance of the battery string.
In order to ensure that the conductive connecting piece and the tandem connection position are not damaged in the battery string transferring process, the tensile strength of the conductive connecting piece and the tandem connection position needs to be improved, so that the performance requirements on the conductive connecting piece and the electrode paste are improved, and the cost of the conductive connecting piece and the electrode paste is increased.
Disclosure of Invention
One of the objectives of the present invention is to provide a solar cell, when the solar cell is tiled and connected in series to prepare a cell string, two adjacent solar cells can be connected in series through a conductive connecting member, and the conductive connecting member can be only disposed in a gap between two adjacent solar cells and does not need to extend to the front side of the solar cell, so that the conductive connecting member can be prevented from shielding the sunlight on the front side of the solar cell, and the efficiency of the solar cell and the module can be improved.
In order to achieve one of the above objects, the present invention provides a solar cell, including: a front side, a back side, and a pair of oppositely disposed side surfaces;
the pair of side surfaces comprises a first side surface and a second side surface;
a first insulating layer and a first conducting layer are sequentially arranged on the first side face from inside to outside, the first insulating layer is used for preventing the first conducting layer from being short-circuited with the first side face, and the first insulating layer is used for preventing the first conducting layer from being short-circuited with the back face of the battery piece;
A second insulating layer and a second conducting layer are sequentially arranged on the second side face from inside to outside, the second insulating layer is used for preventing the second conducting layer from being short-circuited with the second side face, and the second insulating layer is used for preventing the second conducting layer from being short-circuited with the front face of the battery piece;
the first conductive layer is provided with: the front surface extension part extends to the front surface of the battery piece and is used as a front surface electrode;
the second conductive layer is provided with: the back surface extending part extends to the back surface of the battery piece and is used as a back surface electrode.
The cell of the invention has a specially designed three-dimensional electrode structure:
the first conductive layer and the front extension part thereof can form a three-dimensional front electrode;
the second conductive layer and the back surface extension part thereof can form a three-dimensional back surface electrode;
the first insulating layer can isolate the first conducting layer from the first side surface and the back surface of the cell, so as to prevent the first conducting layer from being short-circuited with the first side surface and the back surface of the cell (namely prevent the three-dimensional front electrode from being short-circuited with the first side surface and the back surface of the cell);
the second insulating layer can isolate the second conducting layer from the second side surface and the front surface of the battery piece, so as to prevent the second conducting layer from being short-circuited with the second side surface and the front surface of the battery piece (namely, prevent the three-dimensional back electrode from being short-circuited with the second side surface and the front surface of the battery piece).
Based on the specially designed three-dimensional electrode structure, when the battery pieces are tiled and connected in series to prepare the battery string, the connection position of the conductive connecting piece can be different from that of the existing battery pieces.
The method for preparing the battery string by tiling and connecting the battery pieces in series comprises the following steps:
the battery pieces are sequentially paved along a certain arrangement direction, the front side of each battery piece is arranged upwards or downwards, the second side surface of the next battery piece is arranged opposite to the first side surface of the previous battery piece, and the second conducting layer of the next battery piece is connected with the first conducting layer of the previous battery piece in series through a conducting connecting piece;
alternatively, the first and second electrodes may be,
the battery pieces are sequentially tiled along a certain arrangement direction, the front side of each battery piece is arranged upwards or downwards, the first side face of the next battery piece is arranged opposite to the second side face of the previous battery piece, and the first conducting layer of the next battery piece is connected with the second conducting layer of the previous battery piece in series through the conducting connecting piece.
Preferably, the conductive connecting piece is a welding wire, a welding strip, a conductive adhesive tape, a connecting piece coated with a conductive adhesive or a connecting piece coated with soldering tin.
Therefore, when the battery pieces are tiled and connected in series to prepare the battery string, the conductive connecting piece only needs to be connected with the first conductive layer and the second conductive layer of two adjacent battery pieces, the conductive connecting piece can be only arranged in the gap between the two adjacent battery pieces and does not need to extend to the front side of the battery pieces, the conductive connecting piece can be prevented from shading the sunlight on the front side of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved.
It should be noted that the above-mentioned conductive connecting member does not necessarily extend to the front surface of the battery cell, and does not mean that the conductive connecting member cannot extend to the front surface of the battery cell for series connection, so it is within the scope of the present invention to extend the conductive connecting member to the front surface of the battery cell for series connection.
The second purpose of the invention is to provide a solar cell slice which can be symmetrically spliced, when the cell slice is tiled and connected in series to prepare a cell string, two adjacent cell slices can be symmetrically spliced and fixedly connected in series through conductive adhesive, and a conductive connecting piece is not needed to be used for connecting in series, so that the complex step of connecting in series by adopting the conductive connecting piece can be omitted, and the working time and the cost of connecting in series by the cell string are greatly reduced; the conductive adhesive can be only arranged in the gap between two adjacent battery pieces and does not need to be coated on the front surfaces of the battery pieces, so that the conductive adhesive can be prevented from shielding the sunlight on the front surfaces of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved; and two adjacent battery pieces are symmetrically spliced to form close arrangement, so that the area of the assembly is fully utilized, and the assembly efficiency can be improved.
In order to achieve the second object, the present invention provides a solar cell slice capable of being symmetrically spliced, comprising: a front side, a back side, and a pair of oppositely disposed side surfaces;
The pair of side surfaces includes a first side surface and a second side surface;
a first insulating layer and a first conducting layer are sequentially arranged on the first side face from inside to outside, the first insulating layer is used for preventing the first conducting layer from being short-circuited with the first side face, and the first insulating layer is used for preventing the first conducting layer from being short-circuited with the back face of the battery piece;
a second insulating layer and a second conducting layer are sequentially arranged on the second side face from inside to outside, the second insulating layer is used for preventing the second conducting layer from being short-circuited with the second side face, and the second insulating layer is used for preventing the second conducting layer from being short-circuited with the front face of the battery piece;
the first conductive layer is provided with: the front surface extension part extends to the front surface of the battery piece and is used as a front surface electrode;
the second conductive layer is provided with: a back surface extension part which extends to the back surface of the battery piece and is used as a back surface electrode;
the pair of side surfaces are parallel and symmetrically arranged; the first conducting layer and the second conducting layer are symmetrically arranged.
Preferably, the whole battery piece is rectangular; the pair of side surfaces are side surfaces at two ends of the battery piece in the length direction; alternatively, the pair of side surfaces are side surfaces at both ends of the battery piece in the width direction.
Preferably, the first insulating layer covers the first side face, and the first conductive layer covers the first insulating layer; the second insulating layer covers the second side face, and the second conducting layer covers the second insulating layer.
Preferably, the first conducting layer is provided with a plurality of first vacant areas, and the second conducting layer is provided with a plurality of second vacant areas; the second vacant areas correspond to the first vacant areas one by one, and the second vacant areas are symmetrically arranged with the corresponding first vacant areas.
On the basis of the three-dimensional electrode structure, the battery piece is further optimally designed, so that the first side surface and the second side surface of the battery piece are parallel and symmetrically arranged, and the first conducting layer and the second conducting layer are symmetrically arranged, and the battery piece capable of being symmetrically spliced is obtained.
When the battery pieces which can be symmetrically spliced are adopted to be tiled and connected in series to prepare the battery string, a conductive connecting piece does not need to be used for connecting in series, and the battery string is further different from the existing battery pieces.
The method for preparing the battery string by tiling and connecting the symmetrically spliced battery pieces in series comprises the following steps:
the battery pieces are sequentially paved along a certain arrangement direction, the front side of each battery piece is arranged upwards or downwards, the second side surface of the next battery piece is arranged opposite to the first side surface of the previous battery piece, the second conducting layer of the next battery piece is symmetrically spliced with the first conducting layer of the previous battery piece, and the second conducting layer of the next battery piece is fixedly connected with the first conducting layer of the previous battery piece through conducting resin;
Alternatively, the first and second liquid crystal display panels may be,
the battery pieces are sequentially tiled along a certain arrangement direction, the front side of each battery piece is arranged upwards or downwards, the first side face of the next battery piece is arranged opposite to the second side face of the previous battery piece, the first conducting layer of the next battery piece is symmetrically spliced with the second conducting layer of the previous battery piece, and the first conducting layer of the next battery piece is fixedly connected with the second conducting layer of the previous battery piece through conducting resin.
Therefore, when the symmetrically spliced battery pieces are used for flatly paving and serially connecting to prepare the battery string, the first conducting layers and the second conducting layers of the two adjacent battery pieces can be symmetrically spliced without using a conducting connecting piece for serial connection, and are fixedly connected through conducting adhesives, so that the complex step of serially connecting the conducting connecting pieces can be omitted, and the working time and the cost of serially connecting the battery strings are greatly reduced; the conductive adhesive can be only arranged in the gap between two adjacent battery pieces, for example, the conductive adhesive only needs to coat the first conductive layer and/or the second conductive layer of two adjacent battery pieces, and does not need to be coated on the front surfaces of the battery pieces, so that the conductive adhesive can be prevented from shielding the sunlight on the front surfaces of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved; and two adjacent battery pieces are symmetrically spliced to form close arrangement, so that the area of the assembly is fully utilized, and the assembly efficiency can be improved.
It should be noted that, the above-mentioned symmetrically-spliced battery pieces need not be connected in series by using the conductive connecting member, and does not mean that the symmetrically-spliced battery pieces cannot be connected in series by using the conductive connecting member, so that it is within the scope of the present invention to connect the symmetrically-spliced battery pieces in series by using the conductive connecting member.
The third purpose of the invention is to provide a manufacturing method of a solar cell module, which adopts symmetrically spliced cells to tile and connect in series to prepare a cell string, when the symmetrically spliced cells are tiled and connected in series to prepare the cell string, two adjacent cells can be symmetrically spliced and connected in series through conductive adhesive, and a conductive connecting piece is not needed to be used for connecting in series, so that the complex step of connecting in series by adopting the conductive connecting piece can be omitted, and the working time and the cost of connecting in series of the cell string are greatly reduced; the conductive adhesive can be only arranged in the gap between two adjacent battery pieces and does not need to be coated on the front surfaces of the battery pieces, so that the conductive adhesive can be prevented from shielding the sunlight on the front surfaces of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved; the two adjacent battery pieces are symmetrically spliced to form close arrangement, so that the area of the assembly is fully utilized, and the assembly efficiency can be improved; the battery pieces are directly tiled and connected in series at the assembly lamination station, so that the transfer step of transferring the battery pieces to the assembly lamination station after the battery pieces are connected in series in the prior art is omitted, the problem that the battery pieces are likely to crack in the transfer step is avoided, and the requirement on the bonding strength of the conductive adhesive is reduced; before the assembly laminating step, the thermosetting of the conductive adhesive is not carried out, but the thermosetting of the conductive adhesive is put into the assembly laminating step to be carried out, and the curing of the conductive adhesive and the laminating of the assembly are realized together through the hot-pressing heating in the assembly laminating step, so that the step of thermosetting the conductive adhesive before the assembly laminating can be omitted, the production efficiency can be improved, and the production cost can be reduced.
In order to achieve the third purpose, the invention provides a manufacturing method of a solar cell module, which comprises module lamination and module lamination; the assembly stack comprises a cell string laying step;
the battery string is formed by tiling and splicing the battery pieces which can be symmetrically spliced, and the battery pieces are tiled and spliced in the step of laying the battery string; the tiling and splicing of the battery pieces comprises the following steps:
the battery pieces are sequentially paved along a certain arrangement direction, the front side of each battery piece is arranged upwards or downwards, the second side surface of the next battery piece is arranged opposite to the first side surface of the previous battery piece, the second conducting layer of the next battery piece is symmetrically spliced with the first conducting layer of the previous battery piece, and the second conducting layer of the next battery piece is bonded with the first conducting layer of the previous battery piece through conducting resin;
alternatively, the first and second electrodes may be,
the battery pieces are sequentially paved along a certain arrangement direction, the front side of each battery piece is arranged upwards or downwards, the first side surface of the next battery piece is arranged opposite to the second side surface of the previous battery piece, the first conducting layer of the next battery piece is symmetrically spliced with the second conducting layer of the previous battery piece, and the first conducting layer of the next battery piece is bonded with the second conducting layer of the previous battery piece through conducting resin;
In the above-described assembly laminating step, the laminated assemblies of the respective layers are made into one body by hot pressing, and the conductive paste is cured by heating of the above-described hot pressing.
According to the invention, the solar cell module is prepared by adopting the symmetrically spliced cell pieces, when the cell pieces are connected in series, two adjacent cell pieces can be symmetrically spliced and are fixedly connected in series through the conductive adhesive, so that the series connection of the conductive connecting pieces is not needed, the complex step of adopting the conductive connecting pieces for series connection can be omitted, and the working time and the cost of the series connection of the cell strings are greatly reduced; the conductive adhesive can be only arranged in the gap between two adjacent battery pieces and does not need to be coated on the front surfaces of the battery pieces, so that the conductive adhesive can be prevented from shielding the sunlight on the front surfaces of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved; and two adjacent battery pieces are symmetrically spliced to form close arrangement, so that the area of the assembly is fully utilized, and the assembly efficiency can be improved.
In addition, the invention directly carries out tiling and serial connection of the battery pieces at the assembly lamination station, thereby saving the transfer step of transferring the battery string to the assembly lamination station after the battery pieces are connected in series in the prior art, avoiding the problem of hidden crack of the battery pieces possibly produced in the transfer step and reducing the requirement on the bonding strength of the conductive adhesive; before the assembly laminating step, the thermosetting of the conductive adhesive is not carried out, but the thermosetting of the conductive adhesive is put into the assembly laminating step to be carried out, and the curing of the conductive adhesive and the laminating of the assembly are realized together through the hot-pressing heating in the assembly laminating step, so that the step of thermosetting the conductive adhesive before the assembly laminating can be omitted, the production efficiency can be improved, and the production cost can be reduced.
In a more specific preferred embodiment, in each of the battery pieces: the first insulating layer is prepared by thermal oxygen passivation, chemical passivation or laser passivation; the second insulating layer is made by thermal oxygen passivation, chemical passivation or laser passivation.
In a more specific preferred embodiment, in each of the battery pieces: the first insulating layer and the second insulating layer are prepared by coating insulating glue; the coating mode is printing, spraying or 3D printing; the insulating glue is acrylic pressure-sensitive adhesive, epoxy glue, silica gel, acrylic resin, hot melt adhesive, silicone resin, polyurethane, phenolic resin, polyamide resin, polyimide resin or polycarbonate.
More specifically, in a third preferred embodiment, in each of the battery pieces: the first conducting layer and the front surface extension part thereof are manufactured by screen printing, coating, electroplating, evaporation, sputtering or 3D printing technology; the second conductive layer and the back surface extension portion thereof are manufactured through screen printing, coating, electroplating, evaporation, sputtering or 3D printing processes.
Drawings
Fig. 1 is a schematic view of a solar cell sheet in example 1;
FIG. 2 is a schematic view of a series connection of battery pieces in example 7;
FIG. 3 is a schematic view of a series connection of battery pieces in example 8;
FIG. 4 is a schematic view of a series connection of battery pieces in example 9;
fig. 5 is a schematic diagram of the cell string in example 10.
FIG. 6 is a schematic view of a series connection of battery pieces in example 11;
fig. 7 is a schematic diagram of the cell string in example 12.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
As shown in fig. 1, the present invention provides a solar cell, including: a front side, a back side, and a pair of oppositely disposed side surfaces;
the pair of side surfaces includes a first side surface and a second side surface;
a first insulating layer 11 and a first conducting layer 21 are sequentially arranged on the first side surface from inside to outside, the first insulating layer 11 is used for preventing the first conducting layer 21 from being short-circuited with the first side surface, and the first insulating layer 11 is used for preventing the first conducting layer 21 from being short-circuited with the back surface of the battery piece;
a second insulating layer 12 and a second conducting layer 31 are sequentially arranged on the second side face from inside to outside, the second insulating layer 12 is used for preventing the second conducting layer 31 from being short-circuited with the second side face, and the second insulating layer 12 is used for preventing the second conducting layer 31 from being short-circuited with the front face of the battery piece;
The first conductive layer 21 is provided with: a front extension part 22 extending to the front of the battery piece and used as a front electrode;
the second conductive layer 31 is provided with: and a rear surface extension part 32 extending to the rear surface of the battery piece and serving as a rear surface electrode.
Example 2
The invention also provides a solar cell, which is different from the solar cell in embodiment 1 in that:
the first insulating layer 11 covers the first side surface, and the first conductive layer 21 covers the first insulating layer 11; the second insulating layer 12 covers the second side and the second conductive layer 31 covers the second insulating layer 12.
Example 3
The invention also provides a solar cell, which is different from the solar cell in embodiment 1 in that:
the pair of side surfaces are parallel and symmetrically arranged; the first conductive layer 21 and the second conductive layer 31 are symmetrically arranged.
Example 4
The invention also provides a solar cell, which is different from the solar cell in embodiment 3 in that:
the whole battery piece is rectangular; the pair of side surfaces are side surfaces at two ends of the battery piece in the length direction; alternatively, the pair of side surfaces are side surfaces at both ends of the battery piece in the width direction.
Example 5
The invention also provides a solar cell, which is different from the solar cell in embodiment 3 or 4 in that:
The first insulating layer 11 covers the first side face, and the first conductive layer 21 covers the first insulating layer 11; the second insulating layer 12 covers the second side, and the second conductive layer 31 covers the second insulating layer 12.
Example 6
The invention also provides a solar cell, which is different from the solar cell in embodiment 3 or 4 in that:
the first conducting layer 21 is provided with a plurality of first vacant areas, and the second conducting layer 31 is provided with a plurality of second vacant areas; the second vacant areas correspond to the first vacant areas one by one, and the second vacant areas are symmetrically arranged with the corresponding first vacant areas.
In a more specific preferred embodiment, in the battery sheet described in any one of embodiments 1 to 6: the first insulating layer is prepared by thermal oxygen passivation, chemical passivation or laser passivation; the second insulating layer is made by thermal oxygen passivation, chemical passivation or laser passivation.
In a second more specific preferred embodiment, in the battery sheet described in any one of embodiments 1 to 6: the first insulating layer and the second insulating layer are prepared by coating insulating glue; the coating mode is printing, spraying or 3D printing; the insulating glue is acrylic pressure-sensitive adhesive, epoxy glue, silica gel, acrylic resin, hot melt adhesive, silicone resin, polyurethane, phenolic resin, polyamide resin, polyimide resin or polycarbonate.
In a more specific preferred embodiment, in the battery sheet described in any one of embodiments 1 to 6: the first conducting layer and the front surface extension part thereof are manufactured by screen printing, coating, electroplating, evaporation, sputtering or 3D printing technology; the second conductive layer and the back surface extension portion thereof are manufactured through screen printing, coating, electroplating, evaporation, sputtering or 3D printing processes.
The battery pieces described in embodiments 1 to 6 of the present invention have a specially designed three-dimensional electrode structure:
the first conductive layer 21 and the front extension 22 thereof may constitute a three-dimensional front electrode 20;
the second conductive layer 31 and the back extension 32 thereof may constitute a stereoscopic back electrode 30;
the first insulating layer 11 can isolate the first conductive layer 21 from the first side surface and the back surface of the cell, so as to prevent the first conductive layer 21 from being short-circuited with the first side surface and the back surface of the cell (i.e. prevent the three-dimensional front electrode 20 from being short-circuited with the first side surface and the back surface of the cell);
the second insulating layer 12 can isolate the second conductive layer 31 from the second side surface and the front surface of the cell, so as to prevent the second conductive layer 31 from being short-circuited with the second side surface and the front surface of the cell (i.e. prevent the three-dimensional back electrode 30 from being short-circuited with the second side surface and the front surface of the cell).
When the battery pieces described in any one of embodiments 1 to 6 are used to lay flat and connect in series to prepare a battery string, the connection position of the conductive connecting member 50 can be different from that of the conventional battery piece, as described in embodiment 7 and embodiment 8.
Example 7
As shown in fig. 2, the method of using the conductive connecting member 50 (the conductive connecting member 50 does not extend to the front surface of the cell) and using the cell sheets described in any one of examples 1 to 6 to lay and connect the cell sheets in series to prepare the cell string is as follows:
the plurality of battery pieces are sequentially tiled along a certain arrangement direction, the front surfaces of the battery pieces are arranged upwards, the second side surface of the next battery piece 42 is arranged opposite to the first side surface of the previous battery piece 41, and the second conductive layer 31 of the next battery piece 42 is connected with the first conductive layer 21 of the previous battery piece 41 in series through the conductive connecting piece 50.
Obviously, the front surfaces of the battery pieces are all arranged downward, and can be correspondingly connected in series, so that the description is omitted here.
Preferably, the conductive connector 50 is a welding wire, a welding strip, a conductive adhesive tape, a connector coated with a conductive adhesive, or a connector coated with a soldering tin.
Example 8
As shown in fig. 3, the method of using the conductive connecting member 50 (the conductive connecting member 50 does not extend to the front surface of the cell sheet) and using the cell sheets described in any one of examples 1 to 6 to lay the cell sheets in series to prepare the cell string is as follows:
the plurality of battery pieces are sequentially tiled along a certain arrangement direction, the front surfaces of the battery pieces are arranged upwards, the first side surface of the next battery piece 42 is arranged opposite to the second side surface of the previous battery piece 41, and the first conducting layer 21 of the next battery piece 42 is connected with the second conducting layer 31 of the previous battery piece 41 in series through the conducting connecting piece 50.
Obviously, the front surfaces of the battery pieces are all arranged downwards, and can be correspondingly connected in series, so that the detailed description is omitted.
Preferably, the conductive connector 50 is a welding wire, a welding strip, a conductive adhesive tape, a connector coated with a conductive adhesive, or a connector coated with a soldering tin.
As can be seen from example 7 and example 8, when the battery pieces described in any one of examples 1 to 6 are tiled and connected in series to prepare the battery string, the conductive connecting member 50 only needs to be connected to the first conductive layer 21 and the second conductive layer 31 of two adjacent battery pieces, and the conductive connecting member 50 can only be disposed in the gap between two adjacent battery pieces and does not need to extend to the front surfaces of the battery pieces, so that the conductive connecting member 50 can be prevented from blocking the sunlight on the front surfaces of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved.
It should be noted that the conductive connecting member 50 does not need to extend to the front surface of the battery cell, and does not mean that the conductive connecting member 50 cannot extend to the front surface of the battery cell for series connection, so it is within the scope of the present invention to extend the conductive connecting member 50 to the front surface of the battery cell for series connection.
In addition, the battery piece described in embodiments 3 to 6 of the present invention is a further optimized design of the battery piece described in embodiment 1, such that the first side surface and the second side surface of the battery piece are parallel and symmetrically disposed, and the first conductive layer 21 and the second conductive layer 31 are symmetrically disposed, so as to obtain a battery piece capable of being symmetrically spliced.
When the battery pieces in any one of embodiments 3 to 6 are used for tiling and connecting in series to prepare a battery string, a conductive connecting piece does not need to be used for connecting in series, and the battery string is further different from the existing battery pieces and is described in embodiment 9 and embodiment 10.
Example 9
As shown in fig. 4, the method for preparing the battery string by tiling and connecting the battery pieces in any one of embodiments 3 to 6 without using the conductive connecting member (only using the conductive adhesive 60) is as follows:
the plurality of battery pieces are sequentially tiled along a certain arrangement direction, the front of each battery piece is arranged upwards, the second side face of the next battery piece 42 is arranged opposite to the first side face of the previous battery piece 41, the second conducting layer 31 of the next battery piece 42 is symmetrically spliced with the first conducting layer 21 of the previous battery piece 41, and the second conducting layer 31 of the next battery piece 42 is fixedly connected with the first conducting layer 21 of the previous battery piece 41 through conducting resin 60.
Obviously, the front surfaces of the battery pieces are all arranged downwards, and can be correspondingly connected in series, so that the detailed description is omitted.
Example 10
As shown in fig. 5, the method for preparing the battery string by tiling and connecting the battery pieces in any one of embodiments 3 to 6 without using the conductive connecting member (only using the conductive adhesive 60) is as follows:
The plurality of battery pieces are sequentially tiled along a certain arrangement direction, the front of each battery piece is arranged upwards, the first side surface of the next battery piece 42 is arranged opposite to the second side surface of the previous battery piece 41, the first conducting layer 21 of the next battery piece 42 is symmetrically spliced with the second conducting layer 31 of the previous battery piece 41, and the first conducting layer 21 of the next battery piece 42 is fixedly connected with the second conducting layer 31 of the previous battery piece 41 through conducting resin 60.
Obviously, the front surfaces of the battery pieces are all arranged downward, and can be correspondingly connected in series, so that the description is omitted here.
As can be seen from examples 9 and 10, when the battery pieces described in any one of examples 3 to 6 are tiled and connected in series to prepare the battery string, the first conductive layers 21 and the second conductive layers 31 of two adjacent battery pieces can be symmetrically spliced and fixedly connected by the conductive adhesive 60 without using a conductive connecting member to connect in series, so that the complicated step of connecting in series by using a conductive connecting member can be omitted, and the working hours and the cost of connecting in series by using the battery string can be greatly reduced; the conductive adhesive 60 can be only arranged in the gap between two adjacent battery pieces, for example, the conductive adhesive 60 only needs to coat the first conductive layer 21 and/or the second conductive layer 31 of two adjacent battery pieces, and does not need to be coated on the front surfaces of the battery pieces, so that the conductive adhesive 60 can be prevented from shielding the sunlight on the front surfaces of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved; and two adjacent battery pieces are symmetrically spliced to form close arrangement, so that the area of the assembly is fully utilized, and the assembly efficiency can be improved.
Example 11
The invention also provides a manufacturing method of the solar cell module, which mainly comprises the following steps:
1) the assembly lamination mainly comprises the following steps:
firstly, toughened glass is laid (the toughened glass is horizontally placed), then a first EVA layer is laid on the toughened glass, and then the battery pieces are connected in series and laid on the first EVA layer, and the laying of the battery string is directly completed on the first EVA layer;
the battery string is formed by tiling and splicing the battery pieces in any one of embodiments 3 to 6, and the tiling and splicing of the battery pieces comprises the following steps:
as shown in fig. 6, a plurality of battery pieces are sequentially laid in a certain arrangement direction, the front surface of each battery piece is arranged downward, the second side surface of the next battery piece 42 is arranged opposite to the first side surface of the previous battery piece 41, the second conductive layer 31 of the next battery piece 42 is symmetrically spliced with the first conductive layer 21 of the previous battery piece 41, and the second conductive layer 31 of the next battery piece 42 is bonded with the first conductive layer 21 of the previous battery piece 41 through a conductive adhesive 60;
after the battery string is laid, laying a second EVA layer on the battery string, and laying a back plate on the second EVA layer;
2) assembly lamination, essentially comprising the steps of:
putting the laid laminated assembly into an assembly laminating machine, and bonding and fusing the laminated assemblies together under certain temperature and pressure conditions through hot pressing to form a whole; and the conductive paste 60 is cured by heating by the above-mentioned hot pressing; the hot pressing temperature is 100-200 ℃, and the hot pressing time is 30-1800 s;
3) The framing method mainly comprises the following steps:
the assembly laminate was mounted with a frame, and the portions of the assembly laminate in contact with the frame were sealed with silicone, and then a junction box was mounted on the back of the assembly.
Example 12
The invention also provides a manufacturing method of the solar cell module, which mainly comprises the following steps:
1) the assembly lamination mainly comprises the following steps:
firstly, toughened glass is laid (the toughened glass is horizontally placed), then a first EVA layer is laid on the toughened glass, and then the battery pieces are connected in series and laid on the first EVA layer, and the laying of the battery string is directly completed on the first EVA layer;
the battery string is formed by tiling and splicing the battery pieces in any one of embodiments 3 to 6, and the tiling and splicing of the battery pieces comprises the following steps:
as shown in fig. 7, a plurality of battery pieces are sequentially laid in a certain arrangement direction, the front surface of each battery piece is arranged downward, the first side surface of the next battery piece 42 is arranged opposite to the second side surface of the previous battery piece 41, the first conductive layer 21 of the next battery piece 42 is symmetrically spliced with the second conductive layer 31 of the previous battery piece 41, and the first conductive layer 21 of the next battery piece 42 is bonded with the second conductive layer 31 of the previous battery piece 41 through a conductive adhesive 60;
After the laying of the battery strings is finished, laying a second EVA layer on the battery strings, and laying a back plate on the second EVA layer;
2) assembly lamination, essentially comprising the steps of:
putting the laid laminated assembly into an assembly laminating machine, and bonding and fusing the laminated assemblies together under certain temperature and pressure conditions through hot pressing to form a whole; and the conductive paste 60 is cured by heating through the above-mentioned hot pressing; the hot pressing temperature is 100-200 ℃, and the hot pressing time is 30-1800 s;
3) the frame assembling method mainly comprises the following steps:
the assembly laminate was mounted with a frame, and the portions of the assembly laminate in contact with the frame were sealed with silicone, and then a junction box was mounted on the back of the assembly.
As can be seen from the embodiment 11 and the embodiment 12, when the solar cell module is prepared by using the cell pieces described in any one of the embodiments 3 to 6, two adjacent cell pieces can be symmetrically spliced and fixedly connected in series by the conductive adhesive 60, so that a conductive connecting member is not needed to be used for series connection, a complicated step of series connection by using the conductive connecting member can be omitted, and the working hours and the cost of series connection of the cell strings can be greatly reduced; the conductive adhesive 60 can be only arranged in the gap between two adjacent battery pieces and does not need to be coated on the front surfaces of the battery pieces, so that the conductive adhesive 60 can be prevented from shielding the sunlight on the front surfaces of the battery pieces, and the efficiency of the battery pieces and the assembly can be improved; and two adjacent battery pieces are symmetrically spliced to form close arrangement, so that the area of the assembly is fully utilized, and the assembly efficiency can be improved.
The solar cell module prepared by the cell in any one of embodiments 3 to 6 can be tiled and connected in series at the module stacking station directly, so that the transfer step of transferring the cell string to the module stacking station after the cell is connected in series in the prior art is omitted, the problem of hidden crack of the cell possibly produced in the transfer step is avoided, and the requirement on the bonding strength of the conductive adhesive 60 is reduced; before the assembly laminating step, the thermosetting of the conductive adhesive 60 is not carried out, but the thermosetting of the conductive adhesive 60 is carried out in the assembly laminating step, and the curing of the conductive adhesive 60 and the laminating of the assembly are realized together through the hot pressing and heating in the assembly laminating step, so that the step of thermosetting the conductive adhesive 60 before the assembly laminating can be omitted, the production efficiency can be improved, and the production cost can be reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (2)
1. The manufacturing method of the solar cell module comprises module lamination and module lamination; the assembly stack comprises a cell string laying step; the method is characterized in that: the solar cell string is formed by tiling and splicing solar cells, and the solar cells are tiled and connected in series at an assembly stacking station;
The solar cell piece comprises: a front side, a back side, and a pair of oppositely disposed side surfaces; the pair of side surfaces comprises a first side surface and a second side surface, and the pair of side surfaces are parallel to each other and are symmetrically arranged; a first insulating layer and a first conducting layer are sequentially arranged on the first side face from inside to outside, the first insulating layer is used for preventing the first conducting layer from being short-circuited with the first side face, and the first insulating layer is used for preventing the first conducting layer from being short-circuited with the back face of the battery piece; the first conductive layer is provided with: the front surface extension part extends to the front surface of the battery piece and is used as a front surface electrode; a second insulating layer and a second conducting layer are sequentially arranged on the second side face from inside to outside, the second insulating layer is used for preventing the second conducting layer from being short-circuited with the second side face, and the second insulating layer is used for preventing the second conducting layer from being short-circuited with the front face of the battery piece; the second conductive layer is provided with: a back surface extension part which extends to the back surface of the battery piece and is used as a back surface electrode; the first conductive layer and the front surface extension part form a three-dimensional front surface electrode; the second conductive layer and the back extension part thereof form a three-dimensional back electrode;
the first insulating layer is prepared by thermal oxygen passivation, chemical passivation or laser passivation; the first conducting layer and the front surface extension part thereof are manufactured by screen printing, coating, electroplating, evaporation, sputtering or 3D printing technology;
The second insulating layer is prepared by thermal oxygen passivation, chemical passivation or laser passivation; the second conducting layer and the back surface extension part thereof are manufactured by screen printing, coating, electroplating, evaporation, sputtering or 3D printing technology;
the first conducting layer and the second conducting layer are symmetrically arranged; the first conducting layer is provided with a plurality of first vacant areas, and the second conducting layer is provided with a plurality of second vacant areas; the second vacant areas correspond to the first vacant areas one by one, and the second vacant areas are symmetrically arranged with the corresponding first vacant areas;
the battery piece tiling and splicing are carried out in the step of laying the battery strings, and the battery piece tiling and splicing comprises the following steps:
the battery pieces are sequentially paved along a certain arrangement direction, the front side of each battery piece is arranged upwards or downwards, the second side surface of the next battery piece is arranged opposite to the first side surface of the previous battery piece, the second conducting layer of the next battery piece is symmetrically spliced with the first conducting layer of the previous battery piece, and the second conducting layer of the next battery piece is bonded with the first conducting layer of the previous battery piece through conducting resin;
alternatively, the first and second electrodes may be,
the battery pieces are sequentially paved along a certain arrangement direction, the front side of each battery piece is arranged upwards or downwards, the first side surface of the next battery piece is arranged opposite to the second side surface of the previous battery piece, the first conducting layer of the next battery piece is symmetrically spliced with the second conducting layer of the previous battery piece, and the first conducting layer of the next battery piece is bonded with the second conducting layer of the previous battery piece through conducting resin;
The conductive adhesive is only arranged in the gap between two adjacent battery pieces; before the assembly laminating step, the thermosetting of the conductive adhesive is not carried out, and the thermosetting of the conductive adhesive is carried out in the assembly laminating step; in the above-described assembly laminating step, the laminated assemblies of the respective layers are made into one body by hot pressing, and the conductive paste is cured by heating of the above-described hot pressing.
2. The method for manufacturing a solar cell module according to claim 1, wherein the cell sheet is rectangular as a whole; the pair of side surfaces are side surfaces at two ends of the battery piece in the length direction; alternatively, the pair of side surfaces are side surfaces at both ends of the battery piece in the width direction.
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