CN109801981B

CN109801981B - L-shaped connecting piece for solar cell and application thereof

Info

Publication number: CN109801981B
Application number: CN201910067972.5A
Authority: CN
Inventors: 常振宇; 符黎明
Original assignee: Changzhou Shichuang Energy Co Ltd
Current assignee: Changzhou Shichuang Energy Co Ltd
Priority date: 2019-01-24
Filing date: 2019-01-24
Publication date: 2022-06-14
Anticipated expiration: 2039-01-24
Also published as: CN109801981A

Abstract

The invention provides an L-shaped connecting piece for a solar cell, which comprises an L-shaped conductive base material, wherein the L-shaped conductive base material comprises the following components in the same direction: the battery pack comprises a first edge, a second edge and a connecting piece, wherein the first edge is used for being abutted with the side surface of a battery piece, and the second edge is used for being abutted with the front surface or the back surface of the battery piece; the first edge and the second edge are integrally connected to form an L shape; the inner side surface of the first edge is covered with insulating glue; and the inner side surface of the second side is covered with soldering tin or conductive adhesive. The invention also provides application of the L-shaped connecting piece. The L-shaped connecting piece has a specially designed three-dimensional structure, so that the front electrode and the back electrode of the battery piece can extend to the side surface of the battery piece, the battery pieces are convenient to be connected in series, and the close arrangement of the battery pieces is easy to realize.

Description

L-shaped connecting piece for solar cell and application thereof

Technical Field

The invention relates to an L-shaped connecting piece for 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 cells in the cell string need to be connected in series through the conductive connecting member, and the conductive connecting member needs to be connected to the front surface (front electrode) of one of the cells, so that the conductive connecting member can shield the light-receiving area on the front surface of the cell (i.e. shield the sunlight on the front surface of the cell), which affects the efficiency of the cell and the assembly.

Moreover, the two ends of each conductive connecting piece are fixedly connected (e.g. welded) with the corresponding electrodes of two adjacent battery pieces, which greatly increases the working hours and the cost for connecting the battery strings in series.

In addition, the conductive connecting pieces are connected in series, and a certain distance is required to be arranged between every two adjacent tiled battery pieces, so that the battery pieces cannot be densely arranged in a tiled mode, the area of the assembly is wasted, and the efficiency of the assembly 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 which is connected in series is transferred to a component laminating station to be laid. In the process of transferring the cell string, the cell is easily influenced by external force to increase the hidden crack probability, and the hidden crack of the cell 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

An object of the present invention is to provide an L-shaped connecting member for solar cells, which can extend the front and back electrodes of the solar cells to the side surfaces of the solar cells, thereby facilitating the connection of the solar cells and the close arrangement of the solar cells.

In order to achieve one of the above objects, the present invention provides an L-shaped connecting member for a solar cell, comprising an L-shaped conductive substrate, the L-shaped conductive substrate comprising: the battery pack comprises a first edge used for being abutted with the side surface of a battery piece and a second edge used for being abutted with the front surface (or front electrode) or the back surface (or back electrode) of the battery piece; the first edge and the second edge are integrally connected to form an L shape;

the inner side surface of the first edge is covered with insulating glue;

and the inner side surface of the second side is covered with soldering tin or conductive adhesive.

Preferably, 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.

The L-shaped connecting piece has a specially designed three-dimensional structure, so that the front electrode and the back electrode of the battery piece can extend to the side surface of the battery piece, the battery pieces are convenient to be connected in series, the close arrangement of the battery pieces is easy to realize, and the application of the L-shaped connecting piece is specifically explained below.

The second purpose of the invention is to provide a solar cell using L-shaped connecting members, wherein the solar cell is further provided with a pair of L-shaped connecting members, the pair of L-shaped connecting members respectively extend the front electrode and the back electrode of the solar cell to a pair of oppositely arranged side surfaces of the solar cell, when the solar cell is tiled and connected in series to prepare a cell string, additional conductive connecting members (such as welding wires, welding strips, conductive adhesive tapes and the like) are not needed to be used for series connection, and the first L-shaped connecting member and the second L-shaped connecting member of two adjacent solar cells can be bonded by conductive adhesives coated outside, so that the complex step of series connection by using additional conductive connecting members can be omitted, and the working hours and the cost of series connection of the cell string can be greatly reduced; and two adjacent battery pieces are bonded through the conductive adhesive coated outside, so that the two adjacent battery pieces are closely arranged, the area of the assembly is more fully utilized, and the assembly efficiency can be improved.

In order to achieve the second object, the present invention provides a solar cell using an L-shaped connecting member, the solar cell comprising: a front side, a back side, and a pair of oppositely disposed side surfaces; the solar cell is characterized in that the solar cell is also provided with a pair of L-shaped connecting pieces, and the pair of L-shaped connecting pieces are L-shaped connecting pieces for the solar cell;

The pair of side surfaces includes a first side surface and a second side surface;

the pair of L-shaped connecting pieces comprises a first L-shaped connecting piece and a second L-shaped connecting piece;

the inner side surface of the first edge on the first L-shaped connecting piece is attached to the first side surface of the battery piece, and the inner side surface of the first edge is fixedly connected with the first side surface of the battery piece through insulating glue covered by the first edge;

the inner side surface of the second edge on the first L-shaped connecting piece is attached to the front electrode of the battery piece, and the inner side surface of the second edge is fixedly connected with the front electrode of the battery piece through conductive adhesive covered by the second edge, or the inner side surface of the second edge is welded with the front electrode of the battery piece through soldering tin covered by the second edge;

the inner side surface of the first edge on the second L-shaped connecting piece is attached to the second side surface of the battery piece, and the inner side surface of the first edge is fixedly connected with the second side surface of the battery piece through insulating glue covered by the inner side surface of the first edge;

the inner side surface of the second edge on the second L-shaped connecting piece is attached to the back electrode of the battery piece, and the inner side surface of the second edge is fixedly connected with the back electrode of the battery piece through conductive adhesive covered by the second L-shaped connecting piece, or the inner side surface of the second edge is welded with the back electrode of the battery piece through soldering tin covered by the second L-shaped connecting piece.

The invention relates to a solar cell applying L-shaped connecting pieces, which is provided with a pair of L-shaped connecting pieces: a first L-shaped connector and a second L-shaped connector;

the second edge of the first L-shaped connecting piece is electrically connected with the front electrode of the battery piece, the first edge of the first L-shaped connecting piece is attached to the first side surface of the battery piece (the insulating glue on the first edge can prevent the first L-shaped connecting piece from being short-circuited with the first side surface of the battery piece and the back surface of the battery piece), and the first edge and the second edge of the first L-shaped connecting piece are integrally connected and electrically conductive, so that the first L-shaped connecting piece can extend the front electrode of the battery piece to the first side surface of the battery piece, namely the outer side surface of the first edge of the first L-shaped connecting piece is electrically connected with the front electrode of the battery piece;

the second edge of the second L-shaped connecting piece is electrically connected with the back electrode of the battery piece, the first edge of the second L-shaped connecting piece is attached to the second side surface of the battery piece (the insulating glue on the first edge can prevent the second L-shaped connecting piece from being short-circuited with the second side surface of the battery piece and the front surface of the battery piece), the first edge and the second edge of the second L-shaped connecting piece are integrally connected and are electrically conductive, and therefore the second L-shaped connecting piece can extend the back electrode of the battery piece to the second side surface of the battery piece, namely the outer side surface of the first edge of the second L-shaped connecting piece is electrically connected with the back electrode of the battery piece.

Based on the specially designed structure: the outer side surface of the first edge of the first L-shaped connecting piece is electrically connected with the front electrode of the battery piece (namely, the first L-shaped connecting piece extends the front electrode of the battery piece to the first side surface of the battery piece), and the outer side surface of the first edge of the second L-shaped connecting piece is electrically connected with the back electrode of the battery piece (namely, the second L-shaped connecting piece extends the back electrode of the battery piece to the second side surface of the battery piece); when the first solar cell applying the L-shaped connecting piece is used for flatly laying and serially connecting to prepare the cell string, the serial connection mode can be different from that of the existing cell.

The method for preparing the battery string by tiling and connecting the solar cells of the L-shaped connecting piece in series comprises the following steps:

the battery plates are sequentially paved along a certain arrangement direction, the front surfaces of the battery plates are arranged upwards or downwards, the second side surface of the next battery plate is arranged opposite to the first side surface of the previous battery plate, and the outer side surface of the first edge of the second L-shaped connecting piece on the next battery plate is bonded with the outer side surface of the first edge of the first L-shaped connecting piece on the previous battery plate through conductive adhesive coated outside;

alternatively, the first and second electrodes may be,

the battery pieces are sequentially paved along a certain arrangement direction, the front surface 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, and the outer side surface of the first edge of the first L-shaped connecting piece on the next battery piece is bonded with the outer side surface of the first edge of the second L-shaped connecting piece on the previous battery piece through the conductive adhesive coated outside.

Therefore, when the solar cells adopting the first L-shaped connecting piece are tiled and connected in series to prepare the cell string, additional conductive connecting pieces (such as welding wires, welding strips, conductive adhesive tapes and the like) do not need to be used for connecting in series, the first L-shaped connecting piece and the second L-shaped connecting piece of two adjacent cells can be bonded by the conductive adhesive coated outside, the complex step of connecting in series by adopting the additional conductive connecting pieces can be omitted, and the working hour and the cost of connecting in series of the cell string are greatly reduced; and two adjacent battery pieces are bonded through the conductive adhesive coated outside, so that the two adjacent battery pieces are closely arranged, the area of the assembly is more fully utilized, and the assembly efficiency can be improved.

It should be noted that the solar cells of the first type using the L-shaped connectors need not be connected in series by using additional conductive connectors, and does not mean that the solar cells of the first type using the L-shaped connectors cannot be connected in series by using additional conductive connectors, so that it is within the scope of the present invention to connect the solar cells of the first type using the L-shaped connectors in series by using additional conductive connectors (e.g., solder wires, solder strips, conductive tapes, etc.).

The third objective of the present invention is to provide a second solar cell using the above-mentioned L-shaped connecting members, wherein the second solar cell is further provided with a pair of L-shaped connecting members, the pair of L-shaped connecting members respectively form a three-dimensional front electrode and a three-dimensional back electrode, 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 (such as a welding wire, a welding strip, a conductive adhesive tape, etc.), 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 of the solar cell, so that the conductive connecting member can be prevented from shielding the sunlight on the front of the solar cell, and the efficiency of the solar cell and the assembly can be improved.

In order to achieve the third objective, the invention provides a second solar cell applying the L-shaped connecting member, the solar cell comprising: a front side, a back side, and a pair of oppositely disposed side surfaces; the solar cell is characterized in that the solar cell is also provided with a pair of L-shaped connecting pieces, and the pair of L-shaped connecting pieces are L-shaped connecting pieces for the solar cell;

the inner side surface of the second edge on the first L-shaped connecting piece is attached to the front surface of the battery piece, and the inner side surface of the second edge is fixedly connected with the front surface of the battery piece through conductive adhesive covered by the second edge, or the inner side surface of the second edge is welded with the front surface of the battery piece through soldering tin covered by the second edge; taking the second edge on the first L-shaped connecting piece as a front electrode of the battery piece;

the inner side surface of the first edge on the second L-shaped connecting piece is attached to the second side surface of the battery piece, and the inner side surface of the first edge is fixedly connected with the second side surface of the battery piece through insulating glue covered by the first edge;

The inner side surface of a second edge on the second L-shaped connecting piece is attached to the back surface of the battery piece, and the inner side surface of the second edge is fixedly connected with the back surface of the battery piece through conductive adhesive covered by the second edge, or the inner side surface of the second edge is welded with the back surface of the battery piece through soldering tin covered by the second edge; and a second edge on the second L-shaped connecting piece is used as a back electrode of the battery piece.

The second solar cell applying the L-shaped connecting piece has a specially designed three-dimensional electrode structure:

the first L-shaped connector may form a stereoscopic front electrode: the second edge of the first L-shaped connecting piece is a front electrode of the battery piece, the first edge and the second edge of the first L-shaped connecting piece are integrally connected and conductive, and the first edge of the first L-shaped connecting piece is attached to the first side surface of the battery piece, so that the first L-shaped connecting piece can extend the front electrode to the first side surface of the battery piece, namely the first L-shaped connecting piece forms a three-dimensional front electrode;

the insulating glue on the first side of the first L-shaped connecting piece can isolate the first L-shaped connecting piece from the first side surface of the battery piece and the back surface of the battery piece, so that the first L-shaped connecting piece is prevented from being short-circuited with the first side surface of the battery piece and the back surface of the battery piece (namely, a three-dimensional front electrode is prevented from being short-circuited with the first side surface of the battery piece and the back surface of the battery piece);

The second L-shaped connector may form a solid back electrode: the second edge of the second L-shaped connecting piece is a back electrode of the battery piece, the first edge and the second edge of the second L-shaped connecting piece are integrally connected and are conductive, and the first edge of the second L-shaped connecting piece is attached to the second side face of the battery piece, so that the second L-shaped connecting piece can extend the back electrode to the second side face of the battery piece, namely the second L-shaped connecting piece forms a three-dimensional back electrode;

the insulating glue on the first edge of the second L-shaped connecting piece can isolate the second L-shaped connecting piece from the second side surface of the battery piece and the front surface of the battery piece, and prevent the second L-shaped connecting piece from being short-circuited with the second side surface of the battery piece and the front surface of the battery piece (namely, prevent the three-dimensional back electrode from being short-circuited with the second side surface of the battery piece and the front surface of the battery piece).

Based on the specially designed three-dimensional electrode structure, when the second solar cell using the L-shaped connecting piece is used for preparing the cell string in a tiled and serial manner, the connecting position of the conductive connecting piece (such as a welding wire, a welding strip, a conductive adhesive tape and the like) can be different from that of the existing cell.

The second method for preparing the battery string by tiling and connecting the solar cells of the L-shaped connecting piece in series comprises the following steps:

Sequentially tiling a plurality of battery pieces along a certain arrangement direction, wherein 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 outer side surface of the first edge of the second L-shaped connecting piece on the next battery piece is connected in series with the outer side surface of the first edge of the first L-shaped connecting piece on the previous battery piece through the conductive connecting piece;

alternatively, the first and second electrodes may be,

the battery pieces are sequentially tiled along a certain arrangement direction, the front sides of the battery pieces are 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 outer side face of the first edge of the first L-shaped connecting piece on the next battery piece is connected in series with the outer side face of the first edge of the second L-shaped connecting piece on the previous battery piece through the conductive 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 second solar cell using the L-shaped connecting member of the present invention is used to tile and serially connect the solar cells to prepare the cell string, the conductive connecting member (such as a solder wire, a solder strip, a conductive adhesive tape, etc.) only needs to be connected to the outer side of the first edge of the first L-shaped connecting member and the outer side of the first edge of the second L-shaped connecting member, and the conductive connecting member can be only disposed in the gap between two adjacent solar cells and does not need to extend to the front surfaces of the solar cells, so that the conductive connecting member can be prevented from shielding the sunlight on the front surfaces of the solar cells, and the efficiency of the solar cells and the module 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 fourth objective of the present invention is to provide a third solar cell using the above-mentioned L-shaped connecting members, wherein a pair of L-shaped connecting members are further disposed on the solar cell, the pair of L-shaped connecting members respectively form a three-dimensional front electrode and a three-dimensional back electrode, and the first edge of the first L-shaped connecting member and the first edge of the second L-shaped connecting member are symmetrically disposed, when the solar cell is prepared by tiling and connecting the solar cell in series, two adjacent solar cells can be symmetrically spliced and fixedly connected in series by an externally coated conductive adhesive, without using additional conductive connecting members (such as a welding wire, a welding strip, a conductive adhesive tape, etc.) in series, thereby eliminating the complicated step of connecting the solar cell in series by using additional conductive connecting members, and greatly reducing the working hours and cost of connecting the solar cell in series; the conductive adhesive coated outside can be only arranged in the gap between two adjacent battery pieces and is not required to be coated on the front surfaces of the battery pieces, so that the conductive adhesive coated outside 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 fourth object, the present invention provides a third solar cell using the L-shaped connecting member, the solar cell comprising: a front side, a back side, and a pair of oppositely disposed side surfaces; the solar cell is characterized in that the solar cell is also provided with a pair of L-shaped connecting pieces, and the pair of L-shaped connecting pieces are L-shaped connecting pieces for the solar cell;

the pair of side surfaces comprises a first side surface and a second side surface;

The inner side surface of the second edge on the second L-shaped connecting piece is attached to the back surface of the battery piece, and the inner side surface of the second edge is fixedly connected with the back surface of the battery piece through conductive adhesive covered by the second edge, or the inner side surface of the second edge is welded with the back surface of the battery piece through soldering tin covered by the second edge; taking the second edge on the second L-shaped connecting piece as a back electrode of the battery piece;

the pair of side surfaces are parallel and symmetrically arranged; the first edge of the first L-shaped connecting piece and the first edge of the second L-shaped connecting piece 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 edge of the first L-shaped connecting member covers the first side surface of the battery piece; the first edge of the second L-shaped connecting piece covers the second side face of the battery piece.

Preferably, a first edge of the first L-shaped connecting piece is provided with a plurality of first vacant areas, and a first edge of the second L-shaped connecting piece 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 third solar cell applying the L-shaped connecting piece has a specially designed three-dimensional electrode structure:

The insulating glue on the first edge of the second L-shaped connecting piece can isolate the second L-shaped connecting piece from the second side surface of the battery piece and the front surface of the battery piece, so that the second L-shaped connecting piece is prevented from being short-circuited with the second side surface of the battery piece and the front surface of the battery piece (namely, the three-dimensional back electrode is prevented from being short-circuited with the second side surface of the battery piece and the front surface of the battery piece).

According to the third solar cell using the L-shaped connecting piece, the solar cell is further optimally designed on the basis of the three-dimensional electrode structure, so that the first side surface and the second side surface of the solar cell are parallel and symmetrically arranged, and the first edge of the first L-shaped connecting piece and the first edge of the second L-shaped connecting piece are symmetrically arranged, so that the symmetrically spliced solar cell is obtained.

When the third solar cell applying the L-shaped connecting piece is adopted to be tiled and connected in series to prepare the cell string, additional conductive connecting pieces (such as welding wires, welding strips, conductive adhesive tapes and the like) do not need to be used for connecting in series, and the third solar cell is further different from the existing cell.

The method for preparing the cell string by tiling and connecting the solar cells of the L-shaped connecting piece comprises the following steps:

the battery plates are sequentially paved along a certain arrangement direction, the front side of each battery plate is arranged upwards or downwards, the second side surface of the next battery plate is arranged opposite to the first side surface of the previous battery plate, the first edge of the second L-shaped connecting piece on the next battery plate is symmetrically spliced with the first edge of the first L-shaped connecting piece on the previous battery plate, and the outer side surface of the first edge of the second L-shaped connecting piece on the next battery plate is fixedly connected with the outer side surface of the first edge of the first L-shaped connecting piece on the previous battery plate through conductive adhesive coated outside;

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 face of the next battery piece is arranged opposite to the second side face of the previous battery piece, the first edge of the first L-shaped connecting piece on the next battery piece is symmetrically spliced with the first edge of the second L-shaped connecting piece on the previous battery piece, and the outer side face of the first edge of the first L-shaped connecting piece on the next battery piece is fixedly connected with the outer side face of the first edge of the second L-shaped connecting piece on the previous battery piece through an externally coated conductive adhesive.

Therefore, when the third solar cell applying the L-shaped connecting piece is used for tiling and connecting in series to prepare the cell string, additional conductive connecting pieces (such as welding wires, welding strips, conductive adhesive tapes and the like) do not need to be used for connecting in series, the first L-shaped connecting piece and the second L-shaped connecting piece (namely the three-dimensional front electrode and the three-dimensional back electrode) of two adjacent cells can be symmetrically spliced and connected in series through the conductive adhesive coated outside, the complex step of connecting in series by adopting the additional conductive connecting pieces can be omitted, and the working time and the cost of connecting in series of the cell string are greatly reduced; the conductive adhesive coated outside can be only arranged in the gap between two adjacent battery pieces, for example, the conductive adhesive coated outside only needs to coat the outer side surface of the first edge of the first L-shaped connecting piece and/or the outer side surface of the first edge of the second L-shaped connecting piece and does not need to be coated on the front surfaces of the battery pieces, so that the conductive adhesive coated outside 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 solar cells of the third type using the L-shaped connecting members do not need to be connected in series by using additional conductive connecting members, and this does not mean that the solar cells of the third type using the L-shaped connecting members cannot be connected in series by using additional conductive connecting members, so it is within the scope of the present invention to connect the solar cells of the third type using the L-shaped connecting members in series by using additional conductive connecting members (such as solder wires, solder strips, conductive tapes, etc.).

The fifth purpose of the present invention is to provide a method for manufacturing a solar cell module, wherein the third solar cell using the L-shaped connecting member of the present invention is used to tile and connect in series to prepare a cell string, and when the third solar cell using the L-shaped connecting member is used to tile and connect in series to prepare the cell string, two adjacent cells can be symmetrically spliced and connected in series through the conductive adhesive coated on the exterior, and no additional conductive connecting member (such as a welding wire, a welding strip, a conductive adhesive tape, etc.) is used for connecting in series, so that the complicated step of connecting in series by using an additional conductive connecting member can be omitted, and the time and cost for connecting in series by using the cell string can be greatly reduced; the conductive adhesive coated outside can be only arranged in the gap between two adjacent battery pieces and is not required to be coated on the front surfaces of the battery pieces, so that the conductive adhesive coated outside 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 coated on the battery pieces is reduced; before the step of laminating the components, the thermosetting of the conductive adhesive coated outside is not carried out, but is carried out in the step of laminating the components, and the curing of the conductive adhesive coated outside and the laminating of the components are realized at the same time through the hot pressing and heating in the step of laminating the components, so that the step of thermosetting the conductive adhesive coated outside before the step of laminating the components can be omitted, the production efficiency can be improved, and the production cost can be reduced.

In order to achieve the fifth 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 cell string is formed by tiling and splicing the third solar cell applying the L-shaped connecting piece, and the cell pieces are tiled and spliced in the step of laying the cell string; the tiling and splicing of the battery pieces comprises the following steps:

the battery plates are sequentially paved along a certain arrangement direction, the front side of each battery plate is arranged upwards or downwards, the second side surface of the next battery plate is arranged opposite to the first side surface of the previous battery plate, the first edge of the second L-shaped connecting piece on the next battery plate is symmetrically spliced with the first edge of the first L-shaped connecting piece on the previous battery plate, and the outer side surface of the first edge of the second L-shaped connecting piece on the next battery plate is bonded with the outer side surface of the first edge of the first L-shaped connecting piece on the previous battery plate through conductive adhesive coated outside;

alternatively, the first and second electrodes may be,

the battery plates are sequentially paved along a certain arrangement direction, the front surfaces of the battery plates are arranged upwards or downwards, the first side surface of the next battery plate is arranged opposite to the second side surface of the previous battery plate, the first edge of the first L-shaped connecting piece on the next battery plate is symmetrically spliced with the first edge of the second L-shaped connecting piece on the previous battery plate, and the outer side surface of the first edge of the first L-shaped connecting piece on the next battery plate is bonded with the outer side surface of the first edge of the second L-shaped connecting piece on the previous battery plate through conductive adhesive coated outside;

In the above-mentioned assembly laminating step, the laminated assembly of each layer is made into an integral body by hot pressing, and the above-mentioned conductive paste coated on the outside is cured by heating of the above-mentioned hot pressing.

According to the invention, the third solar cell piece applying the L-shaped connecting piece is adopted to prepare the solar cell module, when the solar cell pieces are connected in series, two adjacent solar cell pieces can be symmetrically spliced and fixedly connected in series through the conductive adhesive coated on the cell pieces, and extra conductive connecting pieces (such as welding wires, welding strips, conductive adhesive tapes and the like) are not needed to be used for series connection, so that the complex step of adopting the extra conductive connecting pieces for series connection can be omitted, and the working hour and the cost of series connection of the cell strings are greatly reduced; the conductive adhesive coated outside can be only arranged in the gap between two adjacent battery pieces and is not required to be coated on the front surfaces of the battery pieces, so that the conductive adhesive coated outside 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 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 serial connection of the battery pieces 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 coated on the battery pieces; before the assembly laminating step, the thermosetting of the conductive adhesive coated outside is not carried out, but the thermosetting of the conductive adhesive coated outside is put into the assembly laminating step to be carried out, and the curing of the conductive adhesive coated outside and the laminating of the assembly are realized through the hot pressing and heating in the assembly laminating step, so that the step of thermosetting the conductive adhesive coated outside before the assembly laminating can be omitted, the production efficiency can be improved, and the production cost can be reduced.

Drawings

FIG. 1 is a schematic view of an L-shaped connector provided in example 1;

fig. 2 is a schematic view of a battery cell provided in example 2;

FIG. 3 is a schematic view of the series connection of the battery pieces in example 3;

FIG. 4 is a schematic view of the series connection of the battery pieces in example 4;

FIG. 5 is a schematic view of a battery sheet provided in example 5;

FIG. 6 is a schematic view of a series connection of battery pieces in example 10;

FIG. 7 is a schematic view of a series connection of battery pieces in example 11;

FIG. 8 is a schematic view of a series of cells in accordance with example 12;

FIG. 9 is a schematic view of a series connection of battery pieces in example 13;

FIG. 10 is a schematic view of a series of battery cells according to example 14;

fig. 11 is a schematic diagram of cell strings in example 15.

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 an L-shaped connecting member for a solar cell, including an L-shaped conductive substrate 100, where the L-shaped conductive substrate 100 includes: a first edge 101 for abutting against a side surface of the cell piece, and a second edge 102 for abutting against a front surface (or front electrode) or a back surface (or back electrode) of the cell piece; the first side 101 and the second side 102 are integrally connected to form an L shape;

The inner side surface of the first edge 101 is covered with an insulating glue 200;

the inner side of the second side 102 is covered with solder 300 or conductive adhesive 300.

Preferably, the insulating adhesive 200 is an acrylic pressure-sensitive adhesive, an epoxy adhesive, a silica gel, an acrylic resin, a hot melt adhesive, a silicone resin, a polyurethane, a phenolic resin, a polyamide resin, a polyimide resin, or a polycarbonate.

The L-shaped connecting piece has a specially designed three-dimensional structure, so that the front electrode and the back electrode of the battery piece can extend to the side face of the battery piece, the battery pieces are conveniently connected in series, the close arrangement of the battery pieces is easy to realize, and the application of the L-shaped connecting piece is specifically explained in the following embodiment.

Example 2

As shown in fig. 2, the present invention provides a solar cell, including: a front side, a back side, and a pair of oppositely disposed side surfaces; the battery piece is also provided with a pair of L-shaped connecting pieces, and the L-shaped connecting pieces are the L-shaped connecting pieces provided by the embodiment 1;

the pair of L-shaped connectors comprises a first L-shaped connector 40 and a second L-shaped connector 50;

the inner side surface of the first edge 41 of the first L-shaped connecting member 40 is attached to the first side surface of the battery piece, and the inner side surface of the first edge 41 is fixedly connected to the first side surface of the battery piece through the insulating adhesive 200 covered by the inner side surface;

The inner side surface of the second edge 42 of the first L-shaped connecting member 40 is attached to a front electrode (not shown) of a battery piece, and the inner side surface of the second edge 42 is fixedly connected to the front electrode of the battery piece through a conductive adhesive 300 covered by the inner side surface, or the inner side surface of the second edge 42 is welded to the front electrode of the battery piece through a soldering tin 300 covered by the inner side surface;

the inner side surface of the first edge 51 of the second L-shaped connecting piece 50 is attached to the second side surface of the battery piece, and the inner side surface of the first edge 51 is fixedly connected with the second side surface of the battery piece through the insulating glue 200 covered by the inner side surface;

the inner side of the second edge 52 of the second L-shaped connector 50 is attached to a back electrode (not shown) of the battery piece, and the inner side of the second edge 52 is fixedly connected to the back electrode of the battery piece through a conductive adhesive 300 covered by the second edge, or the inner side of the second edge 52 is welded to the back electrode of the battery piece through a solder 300 covered by the second edge.

The solar cell provided in example 2 is provided with a pair of L-shaped connecting members: a first L-shaped connector 40 and a second L-shaped connector 50;

the second edge 42 of the first L-shaped connecting member 40 is electrically connected to the front electrode of the battery piece, the first edge 41 of the first L-shaped connecting member 40 is attached to the first side surface of the battery piece (the insulating glue 200 on the first edge 41 can prevent the first L-shaped connecting member 40 from short-circuiting with the first side surface of the battery piece and the back surface of the battery piece), and the first edge 41 and the second edge 42 of the first L-shaped connecting member 40 are integrally connected and electrically conductive, so that the first L-shaped connecting member 40 can extend the front electrode of the battery piece to the first side surface of the battery piece, that is, the outer side surface of the first edge 41 of the first L-shaped connecting member 40 is electrically connected to the front electrode of the battery piece;

The second edge 52 of the second L-shaped connector 50 is electrically connected to the back electrode of the cell, the first edge 51 of the second L-shaped connector 50 is attached to the second side of the cell (the insulating glue 200 on the first edge 51 can prevent the second L-shaped connector 50 from short-circuiting with the second side of the cell and the front surface of the cell), and the first edge 51 and the second edge 52 of the second L-shaped connector 50 are integrally connected and electrically conductive, so that the second L-shaped connector 50 can extend the back electrode of the cell to the second side of the cell, that is, the outer side surface of the first edge 51 of the second L-shaped connector 50 is electrically connected to the back electrode of the cell.

Based on the specially designed structure: the outer side surface of the first edge 41 of the first L-shaped connecting member 40 is electrically connected with the front electrode of the cell (i.e. the first L-shaped connecting member 40 extends the front electrode of the cell to the first side surface of the cell), and the outer side surface of the first edge 51 of the second L-shaped connecting member 50 is electrically connected with the back electrode of the cell (i.e. the second L-shaped connecting member 50 extends the back electrode of the cell to the second side surface of the cell); when the solar cell provided in example 2 is used to lay flat and connect in series to prepare a cell string, the connection manner can be different from the existing cell, as detailed in examples 3 and 4.

Example 3

As shown in fig. 3, the method of preparing the battery string by tiling and connecting the battery pieces provided in example 2 without using conductive connecting members (e.g., welding wires, welding strips, conductive tapes, etc.) and using only the coated conductive adhesive 70 is as follows:

a plurality of battery pieces are sequentially paved along a certain arrangement direction, the front side of each battery piece is arranged upwards, the second side surface of the next battery piece 62 is arranged opposite to the first side surface of the previous battery piece 61, and the outer side surface of the first side of the second L-shaped connecting piece 50 on the next battery piece 62 is bonded with the outer side surface of the first side of the first L-shaped connecting piece 40 on the previous battery piece 61 through the conductive adhesive 70 coated outside.

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.

Example 4

As shown in fig. 4, the method for preparing the battery string by laying and connecting the battery pieces provided in example 2 without using the conductive connecting member (such as welding wire, welding strip, conductive adhesive tape, etc.) and only using the coated conductive adhesive 70 is as follows:

the plurality of battery pieces are sequentially laid in a certain arrangement direction, the front face of each battery piece is arranged upwards, the first side face of the next battery piece 62 is arranged opposite to the second side face of the previous battery piece 61, and the outer side face of the first edge of the first L-shaped connecting piece 40 on the next battery piece 62 is bonded with the outer side face of the first edge of the second L-shaped connecting piece 50 on the previous battery piece 61 through the conductive adhesive 70 coated outside.

As can be seen from the embodiments 3 and 4, when the solar cells provided in embodiment 2 are used to prepare the cell string by tiling and connecting in series, additional conductive connecting members (such as solder wires, solder strips, conductive tapes, etc.) do not need to be used for series connection, and the first L-shaped connecting member 40 and the second L-shaped connecting member 50 of two adjacent cells can be bonded by the conductive adhesive 70 coated on the outer surfaces thereof, so that the complicated step of connecting in series by using additional conductive connecting members can be omitted, and the time and cost for connecting in series the cell string can be greatly reduced; and the two adjacent battery pieces are bonded by the conductive adhesive 70 coated outside, so that the two adjacent battery pieces are closely arranged, the area of the assembly is more fully utilized, and the assembly efficiency can be improved.

It should be noted that the solar cells provided in example 2 do not need to be connected in series by using additional conductive connecting members, and this does not mean that the solar cells provided in example 2 cannot be connected in series by using additional conductive connecting members, so it is within the protection scope of the present invention to connect the solar cells provided in example 2 in series by using additional conductive connecting members (such as solder wires, solder ribbons, conductive adhesive tapes, etc.).

Example 5

As shown in fig. 5, the present invention also provides a solar cell, which includes: a front side, a back side, and a pair of oppositely disposed side surfaces; the battery piece is also provided with a pair of L-shaped connecting pieces, and the pair of L-shaped connecting pieces are the L-shaped connecting pieces provided for the embodiment 1;

the inner side surface of the second edge 42 on the first L-shaped connecting member 40 is attached to the front surface of the battery piece, and the inner side surface of the second edge 42 is fixedly connected with the front surface of the battery piece through the conductive adhesive 300 covered by the second edge, or the inner side surface of the second edge 42 is welded with the front surface of the battery piece through the soldering tin 300 covered by the second edge; the second edge 42 of the first L-shaped connecting member 40 is used as the front electrode of the cell;

the inner side surface of the first edge 51 of the second L-shaped connecting piece 50 is attached to the second side surface of the battery piece, and the inner side surface of the first edge 51 is fixedly connected with the second side surface of the battery piece through the insulating glue 200 covered by the first edge 51;

The inner side surface of the second edge 52 on the second L-shaped connecting piece 50 is attached to the back surface of the battery piece, and the inner side surface of the second edge 52 is fixedly connected with the back surface of the battery piece through the conductive adhesive 300 covered by the second edge, or the inner side surface of the second edge 52 is welded with the back surface of the battery piece through the solder 300 covered by the second edge; the second edge 52 of the second L-shaped connecting member 50 is used as the back electrode of the cell.

Example 6

The invention also provides a solar cell, which is different from the solar cell in embodiment 5 in that:

the pair of side surfaces are parallel and symmetrically arranged; the first side 41 of the first L-shaped connector 40 is symmetrically disposed with respect to the first side 51 of the second L-shaped connector 50.

Example 7

The invention also provides a solar cell, which is different from the solar cell in embodiment 6 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 8

The invention also provides a solar cell, which is different from the solar cell in embodiment 6 or 7 in that:

the first edge 41 of the first L-shaped connecting piece 40 covers the first side surface of the battery piece; the first edge 51 of the second L-shaped connecting member 50 covers the second side of the battery piece.

Example 9

the first edge 41 of the first L-shaped connecting piece 40 is provided with a plurality of first vacant areas, and the first edge 51 of the second L-shaped connecting piece 50 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 solar cell provided in any one of embodiments 5 to 9 has a specially designed three-dimensional electrode structure:

the first L-shaped connector 40 may constitute a stereoscopic front electrode: the second edge 42 of the first L-shaped connecting member 40 is a front electrode of the battery piece, the first edge 41 and the second edge 42 of the first L-shaped connecting member 40 are integrally connected and electrically conductive, and the first edge 41 of the first L-shaped connecting member 40 is attached to the first side surface of the battery piece, so that the first L-shaped connecting member 40 can extend the front electrode to the first side surface of the battery piece, that is, the first L-shaped connecting member 40 forms a three-dimensional front electrode;

the insulating glue 200 on the first edge 41 of the first L-shaped connecting member 40 can isolate the first L-shaped connecting member 40 from the first side surface of the battery piece and the back surface of the battery piece, so as to prevent the first L-shaped connecting member 40 from being short-circuited with the first side surface of the battery piece and the back surface of the battery piece (i.e. prevent the three-dimensional front electrode from being short-circuited with the first side surface of the battery piece and the back surface of the battery piece);

The second L-shaped connector 50 may constitute a solid back electrode: the second edge 52 of the second L-shaped connecting member 50 is a back electrode of the battery piece, the first edge 51 and the second edge 52 of the second L-shaped connecting member 50 are integrally connected and electrically conductive, and the first edge 51 of the second L-shaped connecting member 50 is attached to the second side surface of the battery piece, so that the second L-shaped connecting member 50 can extend the back electrode to the second side surface of the battery piece, that is, the second L-shaped connecting member 50 forms a three-dimensional back electrode;

the insulating glue 200 on the first edge 51 of the second L-shaped connector 50 can isolate the second L-shaped connector 50 from the second side surface of the cell and the front surface of the cell, thereby preventing the second L-shaped connector 50 from being short-circuited with the second side surface of the cell and the front surface of the cell (i.e. preventing the three-dimensional back electrode from being short-circuited with the second side surface of the cell and the front surface of the cell).

Based on the specially designed three-dimensional electrode structure, when the solar cells provided in any of embodiments 5 to 9 are tiled and connected in series to prepare a cell string, the connection position of the conductive connecting member 80 (such as a welding wire, a welding strip, a conductive adhesive tape, etc.) can be different from that of the existing cell, as described in embodiment 10 and embodiment 11.

Example 10

As shown in fig. 6, the method for preparing the battery string by using the conductive connecting member 80 (the conductive connecting member 80 does not extend to the front surface of the battery piece) and using the battery pieces provided in any one of examples 5 to 9 to lay and connect the battery pieces in series 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 62 is arranged opposite to the first side surface of the previous battery piece 61, and the outer side surface of the first side of the second L-shaped connecting piece 50 on the next battery piece 62 is connected in series with the outer side surface of the first side of the first L-shaped connecting piece 40 on the previous battery piece 61 through the conductive connecting piece 80.

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 connecting member 80 is a welding wire, a welding strip, a conductive adhesive tape, a connecting member coated with a conductive adhesive, or a connecting member coated with a soldering tin.

Example 11

As shown in fig. 7, the method for preparing a battery string by tiling and connecting battery pieces provided in any one of examples 5 to 9 using the conductive connecting member 80 (the conductive connecting member 80 does not extend to the front surface of the battery piece) 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 62 is arranged opposite to the second side surface of the previous battery piece 61, and the outer side surface of the first edge of the first L-shaped connecting piece 40 on the next battery piece 62 is connected in series with the outer side surface of the first edge of the second L-shaped connecting piece 50 on the previous battery piece 61 through the conductive connecting piece 80.

As can be seen from examples 10 and 11, when the battery string is prepared by tiling and connecting in series as provided in any one of examples 5 to 9, the conductive connecting member 80 (such as a welding wire, a welding strip, a conductive adhesive tape, etc.) only needs to be connected to the outer side surface of the first edge of the first L-shaped connecting member 40 and the outer side surface of the first edge of the second L-shaped connecting member 50, and the conductive connecting member 80 can be disposed only 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 80 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 above-mentioned conductive connecting member 80 does not need to extend to the front surface of the battery cell, and does not mean that the conductive connecting member 80 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 80 to the front surface of the battery cell for series connection.

In addition, in the solar cell provided in any one of embodiments 6 to 9, based on the three-dimensional electrode structure, the cell is further optimally designed, so that the first side surface and the second side surface of the cell are parallel and symmetrically arranged, and the first edge of the first L-shaped connecting member 40 and the first edge of the second L-shaped connecting member 50 are symmetrically arranged, so as to obtain a cell capable of being symmetrically spliced.

When the solar cells provided in any of embodiments 6 to 9 are used to lay down and connect in series to prepare a cell string, it is not necessary to use additional conductive connecting members (such as solder wires, solder strips, conductive tapes, etc.) to connect in series, which is further different from the existing cells, as detailed in embodiments 12 and 13.

Example 12

As shown in fig. 8, the method for preparing the battery string by tiling and connecting the battery pieces provided in any one of examples 6 to 9 without using conductive connecting members (such as welding wires, welding strips, conductive adhesive tapes, etc.) and only using the coated conductive adhesive 70 is as follows:

a plurality of 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 face of the next battery piece 62 is arranged opposite to the first side face of the previous battery piece 61, the first edge of the second L-shaped connecting piece 50 on the next battery piece 62 is symmetrically spliced with the first edge of the first L-shaped connecting piece 40 on the previous battery piece 61, and the outer side face of the first edge of the second L-shaped connecting piece 50 on the next battery piece 62 is fixedly connected with the outer side face of the first edge of the first L-shaped connecting piece 40 on the previous battery piece 61 through the conductive adhesive 70 coated outside.

Example 13

As shown in fig. 9, the method for preparing the battery string by tiling and connecting the battery pieces provided in any one of examples 6 to 9 without using conductive connecting members (such as welding wires, welding strips, conductive adhesive tapes, etc.) and only using the coated conductive adhesive 70 is as follows:

The plurality of 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 62 is arranged opposite to the second side face of the previous battery piece 61, the first edge of the first L-shaped connecting piece 40 on the next battery piece 62 is symmetrically spliced with the first edge of the second L-shaped connecting piece 50 on the previous battery piece 61, and the outer side face of the first edge of the first L-shaped connecting piece 40 on the next battery piece 62 is fixedly connected with the outer side face of the first edge of the second L-shaped connecting piece 50 on the previous battery piece 61 through the externally coated conductive adhesive 70.

As can be seen from examples 12 and 13, when the solar cells provided in any of examples 6 to 9 are tiled and connected in series to prepare a cell string, additional conductive connecting members (such as a welding wire, a welding strip, a conductive adhesive tape, etc.) do not need to be used for series connection, the first L-shaped connecting member 40 and the second L-shaped connecting member 50 (i.e., the three-dimensional front electrode and the three-dimensional back electrode) of two adjacent cells can be symmetrically spliced and connected in series through the conductive adhesive 70 coated on the outer surfaces of the two adjacent cells, so that a complicated step of series connection by using additional conductive connecting members can be omitted, and the working hours and the cost of series connection by using the cell string can be greatly reduced; the conductive adhesive 70 coated outside can be only arranged in the gap between two adjacent battery pieces, for example, the conductive adhesive 70 coated outside only needs to coat the outer side surface of the first edge of the first L-shaped connecting piece 40 and/or the outer side surface of the first edge of the second L-shaped connecting piece 50, and is not required to be coated on the front surfaces of the battery pieces, so that the conductive adhesive 70 coated outside 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 solar cells provided in any of the above-mentioned embodiments 6 to 9 need not be connected in series by using additional conductive connecting members, and it does not mean that the solar cells provided in any of the embodiments 6 to 9 cannot be connected in series by using additional conductive connecting members, so it is within the scope of the present invention to connect the solar cells provided in any of the embodiments 6 to 9 in series by using additional conductive connecting members (such as solder wires, solder strips, conductive tapes, etc.).

Example 14

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 provided by any one of embodiments 6 to 9, and the tiling and splicing of the battery pieces comprises the following steps:

as shown in fig. 10, 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 62 is arranged opposite to the first side surface of the previous battery piece 61, the first edge of the second L-shaped connecting piece 50 on the next battery piece 62 is symmetrically spliced with the first edge of the first L-shaped connecting piece 40 on the previous battery piece 61, and the outer side surface of the first edge of the second L-shaped connecting piece 50 on the next battery piece 62 is bonded with the outer side surface of the first edge of the first L-shaped connecting piece 40 on the previous battery piece 61 through the conductive adhesive 70 coated outside;

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 70 coated on the surface 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 15

1) the assembly lamination mainly comprises the following steps:

As shown in fig. 11, a plurality of battery pieces are sequentially laid in a certain arrangement direction, the front surface of each battery piece is arranged upward or downward, the first side surface of the next battery piece 62 is arranged opposite to the second side surface of the previous battery piece 61, the first edge of the first L-shaped connecting piece 40 on the next battery piece 62 is symmetrically spliced with the first edge of the second L-shaped connecting piece 50 on the previous battery piece 61, and the outer side surface of the first edge of the first L-shaped connecting piece 40 on the next battery piece 62 is bonded with the outer side surface of the first edge of the second L-shaped connecting piece 50 on the previous battery piece 61 through the conductive adhesive 70 coated outside;

2) assembly lamination, essentially comprising the steps of:

3) the framing method mainly comprises the following steps:

As can be seen from the embodiments 14 and 15, when the solar cell module is manufactured by using the cell provided in any one of the embodiments 6 to 9, two adjacent cells can be symmetrically spliced and fixedly connected in series by the conductive adhesive 70 coated on the exterior thereof, and additional conductive connecting members (such as welding wires, welding strips, conductive tapes, etc.) do not need to be used for series connection, so that the complicated step of series connection by using additional conductive connecting members can be omitted, and the working hours and cost of series connection of the cells can be greatly reduced; the conductive adhesive 70 coated outside can be only arranged in the gap between two adjacent battery pieces, and is not required to be coated on the front surfaces of the battery pieces, so that the conductive adhesive 70 coated outside 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 is prepared by adopting the cell provided by any one of the embodiments 6 to 9, the cell can be tiled and connected in series at the module laminating station, the transfer step of transferring the cell string to the module laminating station after the cell is connected in series in the prior art is omitted, the problem that the cell is likely to crack during production in the transfer step is avoided, and the requirement on the bonding strength of the conductive adhesive coated on the cell is reduced; before the assembly laminating step, the thermosetting of the conductive adhesive 70 coated outside is not carried out, but the thermosetting of the conductive adhesive coated outside is carried out in the assembly laminating step, and the curing of the conductive adhesive coated outside 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 coated outside before the assembly laminating can be omitted, the production efficiency can be improved, and the production cost can be reduced.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

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 the assembly laminating station;

the solar cell sheet includes: 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;

the battery piece is also provided with a pair of L-shaped connecting pieces; the L-shaped connecting piece comprises an L-shaped conductive substrate, and the L-shaped conductive substrate comprises: the battery pack comprises a first edge, a second edge and a connecting piece, wherein the first edge is used for being abutted with the side surface of a battery piece, and the second edge is used for being abutted with the front surface or the back surface of the battery piece; the first edge and the second edge are integrally connected to form an L shape; the inner side surface of the first edge is covered with insulating glue; the inner side surface of the second side is covered with soldering tin or conductive adhesive; the pair of L-shaped connecting pieces comprises a first L-shaped connecting piece and a second L-shaped connecting piece;

The inner side surface of the first edge of the first L-shaped connecting piece is attached to the first side surface of the battery piece, and the inner side surface of the first edge is fixedly connected with the first side surface of the battery piece through insulating glue covered by the first L-shaped connecting piece; the inner side surface of the second edge on the first L-shaped connecting piece is attached to the front surface of the battery piece, and the inner side surface of the second edge is fixedly connected with the front surface of the battery piece through conductive adhesive covered by the second edge, or the inner side surface of the second edge is welded with the front surface of the battery piece through soldering tin covered by the second edge;

the inner side surface of the first edge on the second L-shaped connecting piece is attached to the second side surface of the battery piece, and the inner side surface of the first edge is fixedly connected with the second side surface of the battery piece through insulating glue covered by the first edge; the inner side surface of the second edge on the second L-shaped connecting piece is attached to the back surface of the battery piece, and the inner side surface of the second edge is fixedly connected with the back surface of the battery piece through conductive adhesive covered by the second edge, or the inner side surface of the second edge is welded with the back surface of the battery piece through soldering tin covered by the second edge;

the first edge of the first L-shaped connecting piece and the first edge of the second L-shaped connecting piece are symmetrically arranged; the first edge of the first L-shaped connecting piece is provided with a plurality of first vacant areas, and the first edge of the second L-shaped connecting piece 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 second edge on the first L-shaped connecting piece is used as the front electrode of the battery piece, and the second edge on the second L-shaped connecting piece is used as the back electrode of the battery piece; the first L-shaped connecting piece forms a three-dimensional front electrode; the second L-shaped connecting piece forms a three-dimensional back electrode;

carry out battery piece tiling concatenation in above-mentioned battery string lays the step, battery piece tiling concatenation includes the following step:

sequentially tiling a plurality of battery pieces along a certain arrangement direction, wherein 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 first edge of the second L-shaped connecting piece on the next battery piece is symmetrically spliced with the first edge of the first L-shaped connecting piece on the previous battery piece, and the outer side surface of the first edge of the second L-shaped connecting piece on the next battery piece is bonded with the outer side surface of the first edge of the first L-shaped connecting piece on the previous battery piece through an externally coated conductive adhesive;

alternatively, the first and second liquid crystal display panels may be,

sequentially tiling a plurality of battery pieces along a certain arrangement direction, wherein 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 edge of the first L-shaped connecting piece on the next battery piece is symmetrically spliced with the first edge of the second L-shaped connecting piece on the previous battery piece, and the outer side surface of the first edge of the first L-shaped connecting piece on the next battery piece is bonded with the outer side surface of the first edge of the second L-shaped connecting piece on the previous battery piece through an externally coated conductive adhesive;

The conductive adhesive coated outside is only arranged in the gap between two adjacent battery pieces; before the assembly laminating step, the thermosetting of the outer coating conductive adhesive is not carried out, and the thermosetting of the outer coating conductive adhesive is carried out in the assembly laminating step; in the above-mentioned assembly laminating step, the laminated assembly of each layer is made into an integral body by hot pressing, and the above-mentioned conductive paste coated on the outside is cured by heating of the above-mentioned hot pressing.

2. The method of claim 1, wherein the insulating adhesive is an acrylic pressure sensitive adhesive, an epoxy adhesive, a silicone adhesive, an acrylic resin, a hot melt adhesive, a silicone resin, a polyurethane, a phenolic resin, a polyamide resin, a polyimide resin, or a polycarbonate.

3. The method for manufacturing a solar cell module according to claim 2, 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.