CN213752731U - Solar cell module - Google Patents

Abstract

The utility model provides a solar module relates to solar cell technical field. The solar cell module comprises a plurality of cells arranged at intervals along a first direction, wherein each cell comprises a positive electrode face and a negative electrode face which are arranged oppositely, the positive electrode faces of all the cells are basically coplanar, and the negative electrode faces of all the cells are basically coplanar; each metal wire is directly connected with two adjacent battery pieces in the first direction; the positive electrode face of one of the two adjacent battery pieces, the negative electrode face of the other battery piece and a gap between the positive electrode face and the negative electrode face form a connecting face of a metal wire, each metal wire is arranged on the corresponding connecting face in a reciprocating multi-row mode, and two ends of each row are correspondingly close to two ends of the connecting face in the first direction; the film covers the positive electrode face provided with the metal wires and the negative electrode face provided with the metal wires, and the film is connected with the metal wires and the battery piece in a laminating mode. The utility model discloses a solar module photoelectric conversion efficiency is high, and the processing degree of difficulty is low.

Description

Solar cell module

Technical Field

The utility model belongs to the technical field of solar cell, more specifically relates to a solar module.

Background

Solar cells are devices that directly convert light energy into electrical energy by the photoelectric or photochemical effect. The solar cell comprises a cell and grid lines (or metal lines) fixedly connected to the electrode surface of the cell, wherein the cell receives light to generate current, and the grid lines (or metal lines) are used for guiding and collecting the current. The specific structure of the grid lines (or metal lines) and the connection mode of the grid lines (or metal lines) and the electrode surfaces of the cell directly affect the photoelectric conversion efficiency of the solar cell. The related solar cell has low photoelectric conversion efficiency and large processing difficulty.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a solar module to solve and how to improve the technical problem who reduces the processing degree of difficulty when solar cell photoelectric conversion efficiency.

The technical scheme of the utility model is realized like this:

an embodiment of the utility model provides a solar module, include: the battery plates are arranged at intervals along the first direction, each battery plate comprises a positive electrode surface and a negative electrode surface which are arranged oppositely, the positive electrode surfaces of all the battery plates are basically coplanar, and the negative electrode surfaces of all the battery plates are basically coplanar; at least one metal wire, wherein each metal wire is directly connected with two adjacent battery pieces in the first direction; the positive electrode face of one of the two adjacent battery pieces, the negative electrode face of the other battery piece and a gap between the positive electrode face and the negative electrode face form a connecting face of one metal wire, each metal wire is arranged on the corresponding connecting face in a reciprocating multi-row mode, and two ends of each row are correspondingly close to two ends of the connecting face in the first direction; and the film covers the positive electrode surface provided with the metal wires and the negative electrode surface provided with the metal wires, and is connected with the metal wires and the battery piece in a laminating manner.

Furthermore, only one connecting surface is correspondingly formed by two adjacent battery pieces, a plurality of connecting surfaces are formed by a plurality of battery pieces, and all the connecting surfaces are basically parallel.

Further, the direction of extension of each row of each wire is substantially along the first direction; each wire is provided with a transition section connecting adjacent rows to form said reciprocating multiple row arrangement of wires.

Furthermore, the extending direction of the transition section is arc-shaped, and the transition section is close to one end of the connecting surface in the first direction.

Furthermore, the extending direction of the transition section is a straight line, and the transition section is close to one end of the connecting surface in the first direction.

Further, the direction of the straight line is substantially perpendicular to the first direction.

Further, two adjacent rows of each wire are connected to the same end point.

Further, the extending directions of the wires in two adjacent rows of the same row are basically parallel.

Further, the end point of each wire is close to the end of the cell piece in a second direction, which is perpendicular to the first direction.

Further, the lengths of the wires of adjacent rows are substantially the same.

The utility model discloses solar module includes a plurality of battery pieces, wire and the film of connecting with the lamination, every wire and two adjacent battery piece lug connections on the first direction, every wire is connected the face at the correspondence and is reciprocated multirow setting. The utility model discloses the connection of adjacent battery piece can be realized through the mode that sets up of reciprocal multirow to the wire, can also improve the efficiency that the conduction was collected to the battery piece electric current to improve solar module's photoelectric conversion efficiency, and the mode that the lamination is connected realizes the lug connection of wire and battery piece, can effectively reduce solar module's the processing technology degree of difficulty and promote production efficiency and production quality.

Drawings

FIG. 1 is a schematic diagram of the working principle of a solar cell;

FIG. 2 is a schematic diagram of a connection mode of a related solar cell module;

fig. 3 is a schematic perspective view of a solar cell module according to an embodiment of the present invention;

fig. 4 is a front view of a solar cell module according to an embodiment of the present invention;

fig. 5a is a schematic view of an arrangement of solar modules according to an embodiment of the present invention;

FIG. 5b is a schematic view of another arrangement of solar modules;

FIG. 5c is a schematic view of another arrangement of solar modules;

fig. 6 is a front view of a connection surface according to an embodiment of the present invention;

fig. 7a is a schematic view of a wire arrangement according to an embodiment of the present invention;

FIG. 7b is a schematic view of another wire arrangement;

FIG. 7c is a schematic view of another wire arrangement;

FIG. 7d is a schematic view of another wire arrangement;

fig. 7e is a schematic view of another wire arrangement.

Description of reference numerals:

11-auxiliary grid line, 12-main grid line, 20-solar cell module, 21-cell piece, 21A-positive electrode face, 21B-negative electrode face, 22-metal wire, 221-transition section, 222-main section and 23-thin film

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and aspects can be formed by combining different features. In order to avoid unnecessary repetition, various combinations of the specific features of the present invention are not described separately.

In the following description, the term "first/second/so" is used merely to distinguish different objects and does not mean that there is a common or relationship between the objects. It should be understood that the references to "above" and "below" are to be interpreted as referring to the orientation during normal use.

It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The "first direction" refers to the arrangement direction of the battery cells. The utility model provides a solar cell module can be applied to solar cell's production and manufacturing. The solar cell is a cell for directly generating electricity by using sunlight, and includes a plurality of solar cells, i.e., a photovoltaic semiconductor sheet, which is a device for directly converting light energy into electric energy by a photoelectric effect or a photochemical effect. It should be noted that the application scene type of the present invention is not limited to the solar cell module of the present invention.

The working principle of the solar cell is briefly described below with reference to fig. 1 and 2. As shown in fig. 1, a solar cell is based on a semiconductor material, such as a silicon wafer made of silicon material, and utilizes the photosensitive property of the semiconductor material, when sunlight irradiates on the semiconductor, a part of the sunlight is absorbed by the semiconductor or transmitted through the semiconductor, and the rest of the sunlight is reflected at the surface of the semiconductor. The absorbed photons collide with valence electrons of the semiconductor, creating electron-hole pairs. A P-N junction exists in the semiconductor, a potential barrier electric field is formed between the P type region and the N type region, positive holes move towards the P type region, negative electrons move towards the N type region, and therefore current is formed in the semiconductor, and conversion of light energy into electric energy is achieved. As shown in fig. 2, the metal conductor includes a sub-gate line 11 and a main gate line 12, wherein the sub-gate line 11 is used for guiding a current, and the main gate line 12 is used for collecting the current collected from the sub-gate line. The main gate line 12 may also connect the respective battery cells in series or in parallel and is connected to an external load through an electrode lead-out terminal, thereby outputting voltage and current to the outside and generating power.

In the embodiment of the present invention, as shown in fig. 3, the solar cell module 20 includes a plurality of cells 21, at least one metal wire 22, and a film 23. The plurality of battery pieces 21 are arranged at intervals along the first direction, each battery piece 21 comprises a positive electrode face 21A and a negative electrode face 21B which are arranged oppositely, the positive electrode faces 21A of all the battery pieces 21 are basically coplanar, and the negative electrode faces 21B of all the battery pieces 21 are basically coplanar. The first direction refers to an arrangement direction of the cell pieces 21, that is, in the first direction, the plurality of cell pieces 21 of the solar cell module 20 are disposed. Plurality represents greater than or equal to two; the first direction may be a linear direction, and the sizes and shapes of the plurality of battery pieces may be all set to be the same within an error range. Specifically, the arrangement form of the plurality of battery pieces 21 can be flexibly set according to actual requirements, a row of battery strings can be formed by the plurality of battery pieces 21 in a series connection mode, a multi-row matrix type battery pack can also be formed by the plurality of battery pieces 21, and the battery pack can also be formed by the plurality of battery pieces 21 in a parallel connection mode. For simplicity of illustration, in the exemplary embodiment, the manner in which a plurality of battery pieces 21 are formed into a row of battery strings will be described further. The number of the battery pieces 21 can be set according to actual needs, and the larger the number of the battery pieces 21, the larger the output power. The battery pieces 21 may be arranged at equal intervals or at non-equal intervals, and preferably, the battery pieces are arranged at equal intervals.

As shown in fig. 3, the battery sheet 21 may have a substantially rectangular sheet-like structure, i.e., the thickness dimension of the battery sheet 21 is much smaller than the length dimension and the width dimension thereof. Note that the thickness refers to a distance between two surfaces having a large area. As shown in fig. 4, the battery piece 21 has two opposite surfaces, and the opposite surfaces have opposite directions of external normal lines. One of the two surfaces is a positive electrode surface 21A of the cell 21, and the other opposite surface is a negative electrode surface 21B of the cell 21, where the positive electrode surface 21A refers to the front surface of the cell, i.e., the surface having the largest area receiving sunlight, and is positively charged by holes left due to excited transition of electrons, and the negative electrode surface 21B refers to the back surface of the cell, and the back surface is negatively charged due to accumulation of electrons. The positive electrode faces 21A of all the battery pieces 21 are substantially located on the same plane, and the negative electrode faces 21B of all the battery pieces 21 are substantially located on the same plane. It should be noted that, the substantially same plane is to take account of the error of the actual processing and/or assembly process, and the electrode surfaces of the respective battery pieces do not need to be absolutely in the same plane, and may be regarded as being in the same plane within a small range (for example, ± 0.5mm), that is, substantially in the same plane. In this way, the structure of the solar cell module 20 can be made neat and compact.

As shown in fig. 5a, each wire 22 is directly connected to two battery pieces 21 adjacent in the first direction (the left-right direction shown in fig. 5 a). The direct connection means that the wire 22 is in direct contact with the electrode surface of the battery sheet 21, that is, no other substance (except for unavoidable dust, voids, and the like) is present between the wire 22 and the electrode surface of the battery sheet 21. Specifically, the metal wire 22 is a metal conductive wire, and may be, for example, a copper wire, an aluminum wire, or other metal conductive wires, which is not particularly limited herein. The conductive properties of the wires 22 are capable of conducting the current generated by the cell sheet 21. The diameter of the wire 22 can be set according to actual needs. Preferably, the wires 22 have a substantially circular cross-section so that more sunlight can be irradiated onto the cell sheets to improve the photoelectric conversion efficiency. The metal wire 22 can replace printing an expensive silver main grid on the surface of the electrode of the battery piece 21, and the manufacturing process is simple and cost-saving. Every two adjacent battery pieces 21 share one metal wire 22, and the connection of the two adjacent battery pieces 21 can be realized through one metal wire 22. A greater number of battery cells 21 may be connected by wires 22 to form a battery string.

It can be understood that, for a solar cell module having a plurality of metal wires 22 disposed on adjacent cell sheets 21, under the influence of the processing process or the use process, local regions of the cell sheets 21 may be in contact with or completely separated from the electrode surfaces of the cell sheets 21 to different degrees, so that the current conducting capability of the metal wires 22 is disabled, and the photoelectric conversion efficiency of the solar cell module is reduced. For a solar cell module with only a single metal wire 22 disposed on the adjacent cell 21, even if a certain region of the cell 21 is in a state where the metal wire 22 is out of contact with the electrode surface of the cell 21, the part of the metal wire 22 not in contact with the electrode surface of the cell 21 can still conduct and convey the current of the metal wire 22 at the effective contact part due to the continuity and conductivity of the structure of the single metal wire 22. Therefore, the photoelectric conversion efficiency of the solar cell module is met, and the requirements on the manufacturing process of the solar cell module can be reduced.

As shown in fig. 4, the positive electrode face 21A of one cell 21 and the negative electrode face 21B of the other cell 21 of the two adjacent cells 21 and the gap between the positive electrode face 21A and the negative electrode face 21B constitute a connection face of one wire 22. Specifically, for two adjacent battery pieces 21, in the thickness direction of the battery piece 21, the positive electrode face 21A of one battery piece 21 and the negative electrode face 21B of the other battery piece 21 are spaced and parallel, and are spaced apart by a predetermined distance in the first direction (the left-right direction shown in fig. 4), and the gap between the spaces also forms an engagement face that engages the adjacent positive electrode face 21A and the negative electrode face 21B, thereby forming a continuous connection face together. The shape of the connecting surface is arbitrary, and can be a plane or a curved surface; in fact, the engagement surface is not a physically existing surface, but is set to integrate the adjacent positive electrode surface 21A and negative electrode surface 21B, and the engagement surface only needs to connect the adjacent positive electrode surface 21A and negative electrode surface 21B, and does not need to be limited in direction. For two adjacent battery pieces 21, one metal wire 22 is connected with both the positive electrode surface 21A of one battery piece 21 and the negative electrode surface 21B of the other battery piece 21, so that the two adjacent battery pieces 21 can form current transmitted between the positive electrode and the negative electrode through the metal wire 22.

As shown in fig. 5a-5c, each wire 22 is arranged in a plurality of rows reciprocating on the corresponding joint surface, and both ends of each row are correspondingly close to both ends of the joint surface in the first direction (the left-right direction shown in fig. 5 a). The plurality of rows means two or more rows. The extending direction of the wires 22 may be substantially the same as the arrangement direction of the battery cells 21, and the extending direction of the wires 22 may be deviated from the arrangement direction by a certain angle (0 to 30 °), but the overall tendency of the wires 22 may be substantially toward the first direction. As shown in fig. 5a, the extending direction of the wires 22 is substantially parallel to the arrangement direction of the cell pieces 21 (the direction indicated by the arrow in fig. 5 a); as shown in fig. 5b, the extending direction of the wires 22 has a certain inclination angle with respect to the arrangement direction of the cell pieces 21 (the direction indicated by the arrow in fig. 5 b).

Specifically, taking the arrangement shown in fig. 5a as an example, one end of one wire 22 is disposed on the positive electrode surface 21A (or the negative electrode surface 21B) of one of the battery pieces 21, and the wire 22 continuously extends from the positive electrode surface 21A (or the negative electrode surface 21B) to the negative electrode surface 21B (or the positive electrode surface 21A) of the other battery piece 21 in the positive direction (the direction to the right as shown in fig. 5 a) of the first direction, bends after the negative electrode surface 21B (or the positive electrode surface 21A) continuously extends for a predetermined distance, then continuously extends from the negative electrode surface 21B (or the positive electrode surface 21A) to the positive electrode surface 21A (or the negative electrode surface 21B) of the other battery piece 21 in the negative direction (the direction to the left as shown in fig. 5 a), continues for a predetermined distance on the positive electrode surface 21A (or the negative electrode surface 21B), then bends again, and continuously extends from the positive electrode surface 21A (or the negative electrode surface 21B) in the positive direction (the direction to the right as shown in fig. 5 a) of the first direction again Extend to the negative electrode face 21B (or the positive electrode face 21A) of another cell 21, and the reciprocating movement finally forms the reciprocating multiple-row arrangement. The number of the rows of the reciprocating bending can be set according to actual needs. The arrangement mode of multiple reciprocating rows can well collect the current at each position on the electrode surface of the cell 21, improve the utilization rate of the electrode surface of the cell 21 and further improve the photoelectric conversion efficiency of the cell 21.

It should be noted that each of the wires excluding the two ends may not be in direct contact with other rows, that is, the wires in adjacent rows (except for the two ends being bent and reciprocated) need to be spaced, and the spacing distance may be set according to actual needs. On the one hand, the short circuit fault caused by the contact between the metal wires 22 in the working process of the battery piece 21 can be effectively avoided, the use safety and reliability of the battery piece 21 are ensured, on the other hand, the metal wires 22 can generate certain heat in the working state, and the metal wires 22 are arranged at intervals of adjacent rows to effectively dissipate heat.

As shown in fig. 5a, the distance that the wires 22 extend on the electrode surfaces of the two battery sheets 21 may be substantially the same or different for each row of wires. Preferably, each row of metal wires 22 extends for the same distance between two adjacent battery pieces 21, so that the current collecting, conducting and outputting capabilities of the two adjacent battery pieces 21 are approximately the same, and the consistency of the performances of the battery pieces 21 is effectively ensured. Preferably, the length of the wire 22 in each row extending on the electrode surface of each cell 21 is substantially the same as the width of the cell 21 (the length of the cell in the left-right direction as shown in fig. 5 a), so that the utilization rate of the electrode surface of the cell 21 can be effectively improved, and the photoelectric conversion efficiency can be improved. Preferably, the distance between the first row and the last row of wires 22 may be approximately the same as the length of the cell 21 (the length of the cell in the left-right direction as shown in fig. 5 a) for each wire 22, so as to further improve the photoelectric conversion efficiency. A wire 22 has two free ends, either one on one cell piece 21 as shown in fig. 5a and the other on the other cell piece 21 or both on the same cell piece 21 as shown in fig. 5 c.

As shown in fig. 4, the film 23 covers the positive electrode surface 21A on which the wires 22 are provided and the negative electrode surface 21B on which the wires 22 are provided. Specifically, the film 23 may be an optical film having a good light transmittance. Each electrode surface provided with the wires 22 is provided with a film 23, and the shape and size of the film 23 are approximately the same as those of the electrode surface of the covered battery piece 21 correspondingly.

The film 23 is laminated with the wire 22 and the cell sheet 21. The lamination refers to a molding process in which a plurality of layers of the same or different materials are integrated by applying heat and pressure. The utility model discloses do not prescribe a limit to the concrete step and the parameter of lamination, adopt relevant lamination method that can connect the whole procedure of multilayer material all can. Specifically, the metal wires 22 and the film 23 are first formed into a whole by a lamination process, and then the whole is laminated with the electrode surface of the cell 21 to form the solar cell module 20. The related cell assembly is connected by welding the main grid and the cell 21, but the grid lines covering the electrode surface of the cell 21 block the light receiving surface of the cell 21, so that the photoelectric conversion efficiency of the cell 21 is low. The related art reduces the shading area by reducing the wire diameter of the grid line, but the thinner the grid line is, the greater the welding difficulty of the grid line and the battery piece 21 is, and accordingly the welding cost is higher. The laminating process can not only reduce the difficulty of connecting the metal wire 22 and the cell 21, but also is not affected by the diameter of the metal wire 22, so that the metal wire 22 with a smaller diameter can be adopted to effectively reduce the shading area. Although the smaller the cross-sectional area of the wire 22, the greater the resistance loss, a better balance can be achieved between the light shielding rate and the resistance loss by increasing the number of reciprocating rows of the wire 22 to reduce the resistance loss.

The utility model discloses solar module includes a plurality of battery pieces, wire and the film of connecting with the lamination, every wire and two adjacent battery piece lug connections on the first direction, every wire is connected the face at the correspondence and is reciprocated multirow setting. The metal wire can realize the connection of adjacent battery pieces through the mode that sets up of reciprocal multirow, can also improve the efficiency that the battery piece electric current collected the conduction to improve solar module's photoelectric conversion efficiency, and the mode that the lamination is connected realizes the lug connection of metal wire and battery piece, can effectively reduce solar module's the processing technology degree of difficulty and improve production efficiency and production quality.

In some embodiments, as shown in fig. 6, only one connecting surface is formed on two adjacent battery plates 21, and a plurality of connecting surfaces are formed on a plurality of battery plates 21, and the connecting surfaces are substantially parallel. It should be noted that the substantially parallel is to be considered in consideration of the error of the actual machining process and/or assembly process, and each connecting surface does not need to be absolutely parallel, and may be considered parallel within a small range (e.g., 0 to 10 degrees), i.e., substantially parallel. The two adjacent battery plates 21 only form one connecting surface correspondingly, for example, the battery plate a and the battery plate B are two connected battery plates, the positive electrode surface of the battery plate a and the negative electrode surface of the battery plate B can be connected between the battery plates a and B through one metal wire M1, the negative electrode surface of the battery plate a and the positive electrode surface of the battery plate B can be connected through one metal wire M2, but the metal wires M1 and M2 cannot be provided at the same time. Because two adjacent battery pieces are arranged to form only one connecting surface, the arrangement mode of the metal wire for connecting the two adjacent battery pieces can be determined. Specifically, three connection surfaces are illustrated in fig. 6, and the number of the connection surfaces may be any, and is determined by the number of the battery pieces 21, which is not particularly limited herein. The positive electrode surfaces 21A of the respective battery pieces 21 are substantially parallel to each other and substantially coplanar, and similarly, the negative electrode surfaces 21B of the respective battery pieces 21 are substantially parallel to each other and substantially coplanar, and the joining surfaces joining the positive electrode surfaces 21A and the negative electrode surfaces 21B are also substantially parallel to each other. By providing the wires 22 on the respective connection surfaces, the respective battery cells 21 can be connected in series. The series connection of the cells can superpose voltages, but the current does not change, and the lamination is prepared by increasing the output voltage.

In some embodiments, as shown in fig. 7a, each row of each wire 22 extends in a direction substantially along the first direction (left-right direction as shown in fig. 7 a), and each wire 22 is provided with a transition section 221 connecting adjacent rows to form a reciprocating multiple row arrangement of wires 22. The first direction refers to the arrangement direction of the battery cells 21 (the left-right direction shown in fig. 7 a). Specifically, the extending direction of the wires 22 in each row is substantially the same as the arrangement direction of the cell pieces 21, and the extending direction of the wires 22 in each row may have a certain angular deviation (0 to 30 °), but it is sufficient that the overall tendency of the wires 22 in each row is substantially toward the first direction. As shown in fig. 7a, the wires 22 of each row are arranged to extend in a horizontal direction; as shown in fig. 7b, the partial rows of wires 22 have an oblique angle with the horizontal direction, but the partial wires 22 are still extended in the first direction (the left-right direction as shown in fig. 7 a) as a whole. The arrangement mode can effectively reduce the manufacturing difficulty of the metal wire 22 in the reciprocating bending processing technology.

Each wire 22 comprises a plurality of trunk sections 222 extending in a first direction and a plurality of transition sections 221 connecting adjacent trunk sections 222. Wherein the plurality of trunk sections 222 form a multi-row arrangement of wires 22 and the transition sections 221 are connected to further form the wires 22 into a continuous reciprocating arrangement such that the trunk sections 222 and the transition sections 221 together form the reciprocating multi-row arrangement. And the transition section 221 may space adjacent trunk sections 222 apart, that is adjacent rows of wires 22 may be spaced apart to avoid contact. The spacing between the trunk sections 222 in adjacent rows can be flexibly set according to actual needs, and is not particularly limited herein. And the trunk sections 222 of adjacent rows may be equally spaced or unequally spaced. Preferably, the trunk sections 222 of adjacent rows are equally spaced. The metal wires 22 are connected with the thin film 23 and the electrode surfaces of the battery pieces 21 through lamination, the difficulty of the lamination processing technology is small, and therefore the distance between adjacent rows of metal wires 22 can be reduced, and the photoelectric conversion rate of the battery pieces 21 can be further improved through the arrangement mode of the encrypted metal wires 22. The lengths of the trunk sections 222 may be the same or different.

The photoelectric conversion efficiency of the cell can be effectively improved by arranging the metal wires in each row in a manner of being parallel to the first direction; the transition section is arranged to enable the metal wires in each row to keep intervals and form a specific structure form of multiple reciprocating rows, and the structure is simple and effective.

In some embodiments, as shown in fig. 7a and 7b, the extension direction of the transition section 221 is arc-shaped, and the transition section 221 is close to one end of the connecting surface in the first direction. In particular, the wire 22 itself is flexible and can be bent into a circular arc transition as shown in fig. 7 a. And the arc-shaped structure does not leave obvious crease marks on the transition section 221 of the metal wire 22, and angle adjustment can be carried out again if the bent radian is not proper. The length of the trunk section 222 at the electrode surface of the cell 21 may be approximately the same as the width of the cell 21, and accordingly, the transition section 221 is disposed near the outer edge of the cell 21. Thus, the wires 22 can collect and conduct the current of the cell 21 to the maximum extent along the width direction of the cell 21. The transition section of the metal wire is set to be circular arc-shaped, so that the metal wire is simple in structure and easy to machine and form.

In other embodiments, the transition section 221 may have other specific configurations. As shown in fig. 7c and 7d, the extension direction of the transition section 221 is a straight line, and the transition section 221 is close to one end of the connection surface in the first direction. Specifically, the transition section 221 may be a straight line section as shown in fig. 7c, which may have an oblique angle with the main section 222; and may be a straight line segment as shown in fig. 7d that is substantially perpendicular to the trunk segment 222. It should be noted that the substantially perpendicular is also considered to account for the error of the actual manufacturing process, and the transition section 221 does not need to be absolutely perpendicular to the trunk section 222, and can be regarded as substantially perpendicular within a small range (0-10 °). The transition section of the metal wire is arranged into a straight line shape, so that the flexibility and the adjustability of the arrangement mode of the metal wire are further improved.

In other embodiments, as shown in FIG. 7e, two adjacent rows of each wire 22 are connected at the same end point. Specifically, the wires between adjacent rows intersect to form a V-shaped structure. By providing the wires in a V-shaped configuration, the diversity of the arrangement of the wires is further increased.

In some embodiments, as shown in FIG. 7a, the two rows of wires 22 adjacent to the same row extend in a substantially parallel direction. Specifically, each row of each metal wire 22 is substantially parallel to each other and extends along the first direction, so that the arrangement space of the metal wires 22 in the length direction of the cell 21 can be effectively saved, more rows of metal wires 22 can be arranged on the cell 21 with the same length, and the photoelectric conversion efficiency of the cell 21 is further improved.

In some embodiments, as shown in fig. 5c, the end point of each wire 22 is near the end of the cell sheet 21 in the second direction, which is perpendicular to the first direction. It should be noted that the second direction (vertical direction shown in fig. 5 c) refers to a direction perpendicular to the arrangement direction of the cell pieces 21, i.e., the length direction of the cell pieces 21 shown in fig. 5 c. Specifically, each of the wires 22 has two free ends, both of which are close to both ends of the cell piece 21 in the longitudinal direction. In this way, the wires 22 can collect and conduct the current of the cell 21 to the maximum extent along the length direction of the cell 21, and the compactness of the arrangement of the wires 22 on the electrode surface of the cell 21 can be improved.

Preferably, the lengths of the wires 22 of adjacent rows are substantially the same. To effectively ensure the consistency of the photoelectric conversion efficiency of each row of wires 22.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (10)

1. A solar cell module, comprising:

the battery plates are arranged at intervals along the first direction, each battery plate comprises a positive electrode surface and a negative electrode surface which are arranged oppositely, the positive electrode surfaces of all the battery plates are basically coplanar, and the negative electrode surfaces of all the battery plates are basically coplanar;

at least one metal wire, wherein each metal wire is directly connected with two adjacent battery pieces in the first direction; the positive electrode face of one of the two adjacent battery pieces, the negative electrode face of the other battery piece and a gap between the positive electrode face and the negative electrode face form a connecting face of one metal wire, each metal wire is arranged on the corresponding connecting face in a reciprocating multi-row mode, and two ends of each row are correspondingly close to two ends of the connecting face in the first direction;

and the film covers the positive electrode surface provided with the metal wires and the negative electrode surface provided with the metal wires, and is connected with the metal wires and the battery piece in a laminating manner.

2. The solar cell module as claimed in claim 1, wherein two adjacent cell pieces form only one connecting surface, and a plurality of the cell pieces form a plurality of connecting surfaces, and the connecting surfaces are substantially parallel.

3. The solar cell module according to claim 1 or 2, wherein the direction of extension of each row of each wire is substantially along the first direction; each wire is provided with a transition section connecting adjacent rows to form said reciprocating multiple row arrangement of wires.

4. The solar cell module as claimed in claim 3, wherein the transition section extends in an arc shape, and the transition section is adjacent to an end of the connection surface in the first direction.

5. The solar cell module as claimed in claim 3, wherein the transition section extends in a straight line, and the transition section is adjacent to an end of the connection surface in the first direction.

6. The solar cell module as claimed in claim 5, wherein the direction of the straight line is substantially perpendicular to the first direction.

7. The solar cell module according to claim 1 or 2, wherein two adjacent rows of each wire are connected to the same terminal.

8. The solar cell module according to claim 1 or 2, wherein the wires of two adjacent rows of the same row extend in a direction substantially parallel to each other.

9. The solar cell module as claimed in claim 1 or 2, wherein the end point of each wire is close to the end of the cell sheet in a second direction, the second direction being perpendicular to the first direction.

10. The solar module of claim 1 or 2 wherein the lengths of the wires of adjacent rows are substantially the same.

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