CN215266315U - Shingled cell, small cell and shingled photovoltaic module - Google Patents

Abstract

The embodiment of the application provides a shingled cell, a small cell and a shingled photovoltaic module, and relates to the field of solar cell manufacturing. The battery small pieces comprise battery pieces, the front side of each battery piece is provided with a plurality of front side fine grid lines arranged in parallel, the back side of each battery piece is provided with a plurality of back side fine grid lines arranged in parallel or the back side of each battery piece is provided with a back electrode and a back electric field, the front side of each battery piece is also provided with a front side connecting line, the front side connecting lines are continuous or discontinuous line segments, the front side connecting lines are arranged on at least one side of each battery piece, the front side connecting lines are respectively connected with the same side end parts of all the front side fine grid lines, and the front side connecting lines are configured to be in contact with each back side fine grid line of the battery small piece positioned above when the two battery small pieces are arranged in an overlapped mode along the direction of the front side fine grid lines. The tiled cell, the small cell and the tiled photovoltaic module have no design of a main grid, so that the production cost of the electrode is greatly reduced.

Description

Shingled cell, small cell and shingled photovoltaic module

Technical Field

The application relates to the field of solar cell manufacturing, in particular to a tiled cell, a cell slice and a tiled photovoltaic module.

Background

With the increasing consumption of conventional fossil energy such as global coal, petroleum, natural gas and the like, the ecological environment is continuously deteriorated, and the sustainable development of the human society has been seriously threatened. And making energy development strategies in various countries to solve the environmental problems caused by the limitation of conventional fossil energy resources and development and utilization. Solar energy has become one of the most important renewable energy sources by virtue of the characteristics of reliability, safety, universality, long service life, environmental protection and resource sufficiency, and is expected to become a main pillar of global power supply in the future.

Under the background of vigorous popularization and use of green solar energy, the power of the assembly can be obviously improved by the tile-stacking assembly, the tile-stacking assembly is formed by cutting a whole solar cell into a plurality of small cells through special pattern design, overlapping partial regions of the small cells with better consistency, and bonding or directly and physically attaching the small cells through carrier transmission channels on the surfaces of the small cells. The conventional laminated cell has main grid lines, for example, the front side edge of a cell chip has a front side main grid line, the corresponding edge of the back side has a back side main grid line, when two cell chips are overlapped in a laminated manner, the front side main grid line of one cell chip is overlapped and bonded with the back side main grid line of the other cell chip by adopting conductive adhesive or non-conductive adhesive, and current conduction between the chips needs to be ensured. The design with the main grid lines leads to high unit consumption of silver paste for producing the laminated tile assembly and has no obvious cost advantage.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims to provide a tiled cell, a cell slice and a tiled photovoltaic module, which are free of the design of a main grid and greatly reduce the production cost of electrodes.

In a first aspect, an embodiment of the present application provides a battery piece, which includes a battery piece, a plurality of front fine grid lines arranged in parallel are disposed on a front side of the battery piece, a plurality of back fine grid lines arranged in parallel are disposed on a back side of the battery piece, or a back electrode and a back electric field are disposed on the back side, a front connection line is further disposed on the front side of the battery piece, the front connection line is a continuous or discontinuous line segment, the front connection line is disposed on at least one side of the battery piece, the front connection line is connected to a same side end of all the front fine grid lines, and the front connection line is configured such that when two battery pieces are arranged in an overlapping manner along a direction of the front fine grid lines, the front connection line of the battery piece located below is in contact with each back fine grid line of the battery piece located above.

In the implementation process, the grid line combination on the front side of the battery piece is a front electrode, the grid line combination on the back side is a back electrode, and the original main grid line of the battery piece is removed; and the front connecting wire for realizing the current converging effect is designed on the front side of the battery piece, the connecting wire is smaller than the line width of the main grid line, the use of conductive paste can be saved, the line width of the connecting wire can be larger than the width of the auxiliary grid line, and for further saving the use of the conductive paste, the line width of the front connecting wire can be set to be not larger than the line width of the front fine grid line, namely, the front connecting wire is smaller than the original main grid line, the line width is small, the occupied space is small, and the consumption of printing materials is small. After the battery small pieces are overlapped and arranged along the direction of the front thin grid lines to form the laminated battery, the front thin grid lines of the battery small pieces are connected with the back thin grid lines of the battery small pieces which are overlapped by the front thin grid lines through the front connecting lines of the battery small pieces, and therefore current conduction between the two battery small pieces is achieved. Therefore, the battery chip without the main grid design can greatly reduce the electrode production cost and the production and manufacturing cost.

In one possible implementation manner, one side edge area of the front side connecting line arranged on the front side of each cell and the opposite edge area of the back side are overlapped areas, and the front side connecting line is positioned in the overlapped areas of the front sides of the cells; the front connecting line is directly connected with the front thin grid line, the distance between the front connecting line and the end point of the same side of the front thin grid line is a, a is not less than 0 and is less than the width of the overlapping area.

In the implementation process, the front connecting line is positioned in the overlapping region, so that the front connecting line is conveniently in direct contact with the back thin grid line of the other overlapped battery small piece to realize the conduction of current; the front connecting line is directly connected with the front thin grid line, namely the front connecting line and the front thin grid line are arranged in a crossed mode, meanwhile, the distance a between the front connecting line and the adjacent end point of the front thin grid line is not smaller than 0 and smaller than the width of an overlapping area, the front connecting line is guaranteed to be in the overlapping area, and current conduction between two small batteries is achieved.

In one possible implementation manner, the front fine grid lines and the back fine grid lines of each battery small piece are parallel to each other, or the front fine grid lines and the back electrodes of each battery small piece are perpendicular to each other;

and/or the front connecting line is vertical to the front fine grid line.

In the implementation process, when the two battery chips are arranged in an overlapping manner along the direction of the front side fine grid lines, the front side connecting lines of the battery chips located below can be in contact with all the back side fine grid lines of the battery chips located above on the premise that the total length of the front side connecting lines of the battery chips located below is short.

In one possible implementation, the front connection line is a continuous long line, and the long line is connected to the same side end of all the front thin gate lines respectively.

In the implementation process, the continuous long line is easy to effectively contact with all the back thin grid lines only by ensuring that the front connecting line and the back thin grid lines are in an overlapping area, and the overlapping effect is ensured.

In one possible implementation manner, the front connection line is composed of a plurality of short lines arranged at intervals, and each short line is connected with the same side end part of at least one front thin grid line.

In the implementation process, the total length of the short lines arranged at intervals is shorter, so that the production cost of the electrode can be further reduced.

In one possible implementation manner, the back side of the battery piece is further provided with a back side connection line, the back side connection line is connected with the same side end of all the back side fine grid lines respectively, the back side connection line and the front side connection line are located at two opposite side edges of the battery piece respectively, and the back side connection line is configured to contact the back side connection line of the upper battery piece with each front side fine grid line of the lower battery piece when the two battery pieces are arranged in an overlapped mode along the direction of the front side fine grid lines.

In the implementation process, when two small battery pieces are arranged in an overlapped mode along the direction of the front thin grid lines, the front connecting line and each front thin grid line of the lower small battery piece are correspondingly contacted with each back thin grid line and each back connecting line of the upper small battery piece, and the double contact mode realizes effective contact between the front thin grid lines of the lower small battery piece and the back thin grid lines of the lower small battery piece, and ensures that the current conducted to the edge by all the thin grid lines of one small battery piece can be effectively conducted to the next small battery piece.

In a possible implementation manner, a front connecting line is arranged on the edge of the same side of the front surface of the battery piece, which is opposite to the front surface thin grid lines, an auxiliary connecting line is arranged on the edge of the other side of the front surface of the battery piece, the line width of the auxiliary connecting line is not greater than the line width of the front surface thin grid lines, and the auxiliary connecting lines are respectively connected with all the front surface thin grid lines.

In the implementation process, the auxiliary connecting line can realize short connection among the front thin grid lines, and current and output can be collected and output through other front thin grid lines when part of the front thin grid lines are not well printed.

In one possible implementation, the front fine gate lines and the front connection lines are formed by silver paste printing.

In the implementation process, the front connecting line and the front fine grid line can be printed and formed simultaneously according to the corresponding layout design.

In a second aspect, the present embodiments provide a laminated cell sheet capable of being cut into several cell pieces provided in the first aspect.

In a third aspect, an embodiment of the present application provides a tiled photovoltaic module, which includes a plurality of battery strings, each battery string is formed by sequentially overlapping and serially connecting a plurality of battery chips provided in the first aspect along a direction of a front thin grid line.

In the implementation process, the laminated photovoltaic module formed by the small battery pieces can greatly reduce the production cost of the electrode, reduce the production and manufacturing cost and improve the competitiveness of the laminated module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic diagram of a front side structure of a battery cell according to a first embodiment of the present application;

FIG. 2 is an enlarged view of the lower half of FIG. 1;

fig. 3 is an enlarged schematic view of a lower half of the front side of a battery die according to a second embodiment of the present application;

fig. 4 is a schematic diagram of the front lower half of a battery cell according to a third embodiment of the present application;

fig. 5 is a schematic diagram of the front lower half of a battery cell according to a fourth embodiment of the present application;

fig. 6 is a schematic diagram of the front lower half of a battery cell according to a fifth embodiment of the present application;

fig. 7 is a schematic diagram of the front lower half of a battery cell according to a sixth embodiment of the present application;

fig. 8 is a schematic diagram of the front lower half of a battery cell according to a seventh embodiment of the present application;

fig. 9 is a schematic diagram of a back side structure of a battery cell according to an embodiment of the present disclosure;

fig. 10 is an enlarged view of the lower half of fig. 9.

Icon: 100-a cell pellet; 110-a cell piece; 120-front side fine grid lines; 130-front side connection lines; 140-auxiliary connection lines; 150-back side fine grid line; 160-backside connection lines; 200-a cell pellet; 210-front side connection lines; 300-a cell pellet; 310-front side connection lines; 400-a cell pellet; 410-front side connection lines; 500-a cell pellet; 510-front side connection lines; 600-a cell pellet; 610-front side connection lines; 700-a cell pellet; 710-front side connection lines.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the orientations and positional relationships indicated by the terms "upper," "lower," "left," "right," "inner," "outer," and the like are based on the orientations and positional relationships shown in the drawings or the orientations and positional relationships conventionally arranged in use of products of the application, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

First embodiment

Referring to fig. 1, fig. 2, fig. 9, and fig. 10, a battery cell 100 according to the present embodiment includes a battery sheet 110 (an outermost dotted-line frame in the figures), a plurality of front fine grid lines 120 arranged in parallel are disposed on a front surface of the battery sheet 110, and a plurality of back fine grid lines 150 arranged in parallel are disposed on a back surface of the battery sheet 110 (in other embodiments, a back electrode and a back electric field are disposed on the back surface to form a back electric field). The front side of the battery piece 110 is further provided with a front side connection line 130, the line width of the front side connection line 130 is not greater than the line width of the front side fine grid lines 120, in other embodiments, the line width of the front side connection line 130 may also be greater than the line width of the front side fine grid lines 120, the front side connection line 130 is provided on at least one side of the battery piece 110 and is respectively connected to the same side end portions (which may be end points) of all the front side fine grid lines 120, and the front side connection line 130 is configured such that when two battery dies 100 are arranged in an overlapping manner along the direction of the front side fine grid lines 120, the front side connection line 130 of the battery die 100 located below is in contact with each back side fine grid line 150 of the battery die 100 located above. The term "a plurality" in the embodiments of the present application means a number of 3 or more.

In the present embodiment, the battery cell 110 has a rectangular shape having long sides and short sides. Generally, the battery cell 110 is a silicon wafer, which is generally cut from a silicon rod, but is not limited thereto; the corners of the cell piece 110 may be chamfered, two corners of the cell piece 110 in this embodiment are chamfered, and two triangular dotted boxes on the right side edge of fig. 1 illustrate the chamfered two corners of the cell piece 110.

In this embodiment, for a single battery piece 100, the front thin grid lines 120 are all parallel to the short sides of the battery piece 110, that is, each front thin grid line 120 is arranged along a short side, and all the front thin grid lines 120 are arranged at intervals along the long sides of the battery piece 110; the back thin grid lines 150 are all parallel to the short sides of the battery piece 110, that is, each back thin grid line 150 is also arranged along the short sides, all the front thin grid lines 120 are arranged at intervals along the long sides of the battery piece 110, and the front thin grid lines 120 are parallel to the back thin grid lines 150. In other embodiments of the present application, the front fine grid lines 120 and the back fine grid lines 150 may be disposed on the battery cell 110 in other forms, and it is only necessary that the battery cell 100 disposed in a tiling manner can generate current and achieve inter-cell conduction. For example, the front fine grid lines 120 are all parallel to the long side of the battery piece 110, the back fine grid lines 150 are all parallel to the long side of the battery piece 110, or all the front fine grid lines 120 and the back fine grid lines 150 are slightly inclined compared to the long side or the short side, and the front fine grid lines 120 and the back fine grid lines 150 are not limited to be parallel to each other, and the front fine grid lines 120 may be parallel to the short side of the battery piece 110, and the back fine grid lines 150 are slightly inclined compared to the short side. For the case where a back electrode and a back electric field are provided on the back side of the cell 110, the front side fine grid lines 120 and the back side electrode of each cell 100 are perpendicular to each other.

Typically, the front fine gate lines 120, the back fine gate lines 150, and the front connection lines 130 are formed by silver paste printing. The arrangement density of the front fine grid lines 120 is smaller than that of the back fine grid lines 150, namely the distance is larger, so that the front current collection is ensured, and meanwhile, the battery efficiency is not reduced due to the fact that the coverage rate of the whole surface is too large because the density of the front fine grid lines 120 is too large; short connections can be arranged between the front thin gate lines 120, so that other front thin gate lines 120 are prevented from collecting current and outputting when some front thin gate lines 120 are poorly printed, for example, short connection lines are arranged between two adjacent front thin gate lines 120, and the short connection lines are arranged at intervals to ensure the production cost and avoid the overlarge coverage rate. In this embodiment, the line widths of the front thin gate line 120 and the back thin gate line 150 are the same and are both greater than the line width of the front connection line 130.

In the embodiment of the present invention, the front connection line 130 is a continuous long line, the long line is connected to the same side end of all the front thin gate lines 120 respectively, or the front connection line 130 is composed of a plurality of short lines arranged at intervals, and each short line is connected to the same side end of at least one front thin gate line 120. In the embodiment of the present application, the long lines are linear, curved or broken, such as S-line, W-line, or the plurality of short lines are arranged in a linear, curved or broken line. In this embodiment, the front connection line 130 is a continuous long line; the front connection line 130 is linear, and the front connection line 130 is perpendicular to the front fine gate line 120. In other embodiments, the front connection lines 130 may be inclined with respect to the front fine gate lines 120, and it is required to ensure that the front connection lines 130 pass through all the front connection lines 130, so that the front connection lines 130 are directly connected to all the front fine gate lines 120.

Referring to fig. 1 and fig. 2, in the present embodiment, the front connection line 130 is disposed at one long edge of the battery piece 110, specifically, at the left long edge of the battery piece 110. When the two battery chips 100 are disposed in an overlapping manner, the long edges of the two battery chips 110 overlap, that is, the left long edge of the battery chip 100 located below overlaps the right long edge of the battery chip 100 located above.

In the embodiment of the present application, one side edge region (left long edge) of the front connection line 130 and the opposite edge region (right long edge) of the back side of each cell 110 are overlapped regions, the overlapped regions need to be controlled in a relatively small range to ensure the cell efficiency, that is, the width of the overlapped regions is relatively small, and the front connection line 130 is located in the overlapped region of the front side of the cell 110. The front-side connection line 130 is directly connected to the front-side fine gate line 120, and a is a, a is not less than 0, and is less than the width of the overlapping region. That is, the front side connecting line 130 can be designed to be at the same side end point of the front side fine gate line 120 or at the same side end point a away from the front side fine gate line 120, and a is smaller than the width of the overlapping region, for example, a ≦ 2 mm. In this embodiment, the front connection line 130 is located at the left end of all the front thin gate lines 120, i.e. connects the left ends of all the front thin gate lines 120.

In this embodiment, the front side of the battery piece 110 is provided with the front side connection line 130 at the edge of the same side of the front side fine grid line 120, the other side edge is provided with the auxiliary connection line 140, the auxiliary connection line 140 is respectively connected to all the front side fine grid lines 120, that is, the front side connection line 130 is disposed at the left side edge of the battery piece 110, and the auxiliary connection line 140 is disposed at the right side edge of the battery piece 110. The auxiliary connection lines 140 may be arranged in the form of the front connection lines 130, and in this embodiment, the auxiliary connection lines 140 are connected to the right-side end portions of all the front fine gate lines 120. In order to reduce the production cost, the line width of the auxiliary connection line 140 is not greater than the line width of the front fine gate line 120, and in this embodiment, the line width of the auxiliary connection line 140 is equal to the line width of the front fine gate line 120.

Referring to fig. 9 and 10, the schematic diagram of the back side structure of the battery cell 100 shown in fig. 9 is a view taken from the front side of the battery cell 100 shown in fig. 1 after being rotated by 180 ° around the short side, and the back side of the embodiment of the present application can also be designed in a back electric field manner. In this embodiment, the back side of the battery slice 110 is further provided with a back side connection line 160, the back side connection line 160 is perpendicular to the back side fine grid lines, the back side connection line 160 is connected to the same side end of all the back side fine grid lines 150, the back side connection line 160 and the front side connection line 130 are located at two opposite side edges of the battery slice 110, respectively, and the back side connection line 160 is configured such that when two battery slices 100 are arranged in an overlapping manner along the direction of the front side fine grid lines 120, the back side connection line 160 of the upper battery slice 100 contacts each front side fine grid line 120 of the lower battery slice 100. The back connection lines 160 may be arranged according to the front connection lines 130, and are not described in detail herein. The back side connection line 160 is located in the overlapping region of the back side, and the back side connection line 160 may be designed at the same side end point of the back side fine grid line 150 or a distance b from the same side end point, where b is not less than 0 and is less than the width of the overlapping distance, for example, b is less than or equal to 2 mm. In this embodiment, the back connection line 160 is a continuous long line, perpendicular to the back fine gate line 150 and the front fine gate line 120, and disposed at the right end of the back fine gate line 150. In the case of the back-field type, the back connection lines 160 can still be arranged in the same manner as described above, and the front fine grid lines 120 of each cell 100 can still be designed to be perpendicular to the back connection lines 160.

In the embodiment of the present disclosure, the front connection lines 130 may be disposed at one or both edges of the front surface of the battery sheet 110, and the back connection lines 160 may be disposed at one or both edges of the front surface of the battery sheet 110. In this embodiment, the front connection lines 130 are located at the left edge of the front side, and the back connection lines 160 are located at the right edge of the back side, when the two battery dies 100 are arranged in an overlapping manner, the front connection lines 130 and the back connection lines 160 are located in an overlapping region, and the two connection lines are staggered, that is, not overlapped, so as to ensure the contact effect.

In the embodiment of the present application, the front connection lines 130 and the back connection lines 160 may be combined according to the same or different types of line types and arrangement manners, and both the front patterns and the back patterns of the battery cell 100 may be designed according to different pattern design styles, or may be combined in a matching manner, and the following embodiments will list some specific arrangement manners.

The present embodiment also provides a laminated cell sheet 110 that can be cut into a plurality of the above-mentioned cell sheets 100.

Correspondingly, the embodiment also provides a tiled photovoltaic module, which includes a plurality of battery strings, each battery string is formed by sequentially overlapping and serially connecting a plurality of battery chips 100 along the direction of the front thin grid line 120, and the battery strings are provided with bus bars at the head end and the tail end. When the battery pieces 100 are overlapped in a tiling mode, the adjacent two battery pieces 100 are overlapped and bonded by using a conductive adhesive or a non-conductive adhesive in an overlapping area, when the battery pieces are bonded by using the conductive adhesive, the conductive adhesive only needs to be arranged in the overlapping area, but when the battery pieces are bonded by using the non-conductive adhesive, the non-conductive adhesive needs to avoid the front connecting line 130 and the back connecting line 160, for example, the front connecting line 130 and the back connecting line 160 are arranged at intervals, and the front connecting line 130 and the back connecting line 160 are ensured to be in contact with the front fine grid line 120 and the back fine grid line 150, so that current conduction between the pieces is performed.

According to the tiled photovoltaic module, due to the arrangement of the front connecting line 130 and the back connecting line 160, enough conducting channels are formed at the edges of the front thin grid lines 120 and the back thin grid lines 150, so that the current conducted to the edges from all the thin grid lines on each cell chip 100 can be effectively conducted to the next cell, and finally, power output is realized through the bus bars arranged at the head end and the tail end of the cell string.

Second embodiment

Referring to fig. 3, 9 and 10, in the battery cell 200 of the present embodiment, substantially the same as that of the first embodiment, the front thin grid lines 120 are continuous long lines and perpendicular to the front thin grid lines 120, except that: the end point of the same side of the front thin gate line 120 penetrates through the front connection line 210, and a distance a between the front connection line 210 and the end point of the same side of the front thin gate line 120 is 1mm, that is, the front connection line 210 is recessed from the front thin gate line 120.

Third embodiment

Referring to fig. 4, 9 and 10, the present embodiment provides a battery cell 300, which is substantially the same as the first embodiment except that: the front connecting line 310 is composed of a plurality of short lines arranged at intervals, all the short lines are arranged in a linear type (on the same straight line), each short line is connected with the same side end point of two adjacent front thin gate lines 120, that is, the front connecting line 310 is a discontinuous line.

Fourth embodiment

Referring to fig. 5, 9 and 10, the present embodiment provides a battery cell 400, which is substantially the same as the first embodiment except that: the front connection line 410 is composed of a plurality of short lines arranged at intervals, all the short lines are arranged in a linear shape, each short line is correspondingly connected with one side end point of one front fine grid line 120, namely, the front connection line 410 is a discontinuous line.

Fifth embodiment

Referring to fig. 6, 9 and 10, the present embodiment provides a battery cell 500, which is different in that: the front connecting line 510 is composed of a plurality of short lines arranged at intervals, all the short lines are arranged in a linear shape, each short line is connected with the end portion of the same side of two adjacent front thin gate lines 120, and the distance between the front connecting line 510 and the end point of the same side of the front thin gate line 120 is 1mm, that is, the front connecting line 510 is a non-continuous line and is retracted compared with the front thin gate line 120.

Sixth embodiment

Referring to fig. 7, 9 and 10, the present embodiment provides a battery cell 600, which is substantially the same as the first embodiment except that: the front connecting line 610 is composed of a plurality of short lines arranged at intervals, all the short lines are arranged in a linear shape, each short line is correspondingly connected with one side end of one front thin gate line 120, and the distance between the front connecting line 610 and the same side end of the front thin gate line 120 is 1mm, namely, the front connecting line 610 is a non-continuous line and is retracted compared with the front thin gate line 120.

Seventh embodiment

Referring to fig. 8, 9 and 10, the present embodiment provides a battery cell 700, which is substantially the same as the first embodiment except that: the front connecting line 710 is composed of a plurality of short lines arranged at intervals, all the short lines are divided into two groups of short lines, each group of short lines are arranged in a linear type, the two groups of short lines are arranged in a staggered manner, each short line of one group of short lines is correspondingly connected with one side end point of one front thin gate line 120, each short line of the other group of short lines is correspondingly connected with the same side end part of the rest front thin gate lines 120, and the distance between the front connecting line 710 and the same side end point of the front thin gate line 120 is 1mm, namely, the front connecting line 710 is a discontinuous line, and part of the region is retracted compared with the front thin gate line 120.

In summary, the tiled cell, the small cell and the tiled photovoltaic module of the embodiment of the application have no design of the main grid, so that the production cost of the electrode is greatly reduced.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The battery piece is characterized by comprising a battery piece, wherein a plurality of front fine grid lines arranged in parallel are arranged on the front side of the battery piece, a plurality of back fine grid lines arranged in parallel are arranged on the back side of the battery piece, or a back electrode and a back electric field are arranged on the back side of the battery piece, a front connecting line is further arranged on the front side of the battery piece, the front connecting line is a continuous or discontinuous line segment, the front connecting line is arranged on at least one side of the battery piece, the front connecting line is respectively connected with the same side end parts of all the front fine grid lines, and the front connecting line is configured to be positioned below the front connecting line of the battery piece and each back fine grid line of the battery piece positioned above the front connecting line when the two battery pieces are arranged in an overlapped mode along the direction of the front fine grid lines.

2. The battery die of claim 1, wherein each of the front sides of the battery dies has an overlapping region in which one side edge region of the front side connecting line and an opposite edge region of the back side connecting line are disposed, the front side connecting line being located in the overlapping region of the front sides of the battery dies; the front connecting line is directly connected with the front thin grid line, the distance between the front connecting line and the end point of the same side of the front thin grid line is a, and a is not less than 0 and is less than the width of the overlapping area.

3. The battery die of claim 1, wherein the front side fine gridlines and the back side fine gridlines of each battery die are parallel to each other, or the front side fine gridlines and the back side electrode of each battery die are perpendicular to each other;

and/or the front connecting line is vertical to the front fine grid line.

4. The cell chip according to claim 1 or 3, wherein the front connection line is a continuous long line, and the long line is connected to the same side end of all the front fine grid lines.

5. The cell die of claim 1 or 3, wherein the front side connecting lines are formed by a plurality of short lines arranged at intervals, and each short line is connected with the same side end of at least one front side fine grid line.

6. The cell piece of claim 1, wherein the back side of the cell piece is further provided with a back side connection line, the back side connection line is connected to the same side end of all the back side fine grid lines, the back side connection line and the front side connection line are respectively located at two opposite side edges of the cell piece, and the back side connection line is configured such that when two cell pieces are arranged in an overlapping manner in the direction of the front side fine grid lines, the back side connection line of the upper cell piece is in contact with each of the front side fine grid lines of the lower cell piece.

7. The battery piece as recited in claim 1, wherein the front side of the battery piece is provided with the front side connecting lines at the same side edge with respect to the front side fine grid lines, and is provided with auxiliary connecting lines at the other side edge, the width of the auxiliary connecting lines is not greater than that of the front side fine grid lines, and the auxiliary connecting lines are respectively connected with all the front side fine grid lines.

8. The cell die of claim 1, wherein the front side fine gridlines and the front side connecting lines are formed by silver paste printing.

9. A shingled cell sheet capable of being cut into a plurality of cell pieces according to any of claims 1 to 8.

10. A tiled photovoltaic module comprising a plurality of strings, each string comprising a plurality of cells according to any of claims 1 to 8 stacked in series in sequence along the direction of the front surface grid lines.

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