CN218677170U - Photovoltaic module and photovoltaic system - Google Patents

Abstract

The utility model provides a photovoltaic module and photovoltaic system relates to solar photovoltaic technical field. This photovoltaic module includes: a plurality of battery strings arranged in a string array; the battery string includes: a plurality of battery pieces which are connected in series in sequence; among a plurality of battery pieces connected in series in sequence, at least one homologous sliced battery pack, a first sliced battery in one homologous sliced battery pack, and a second sliced battery in the rest battery pieces in the homologous sliced battery pack exist: after the two are spliced along the cutting lines, at least one complete pyramid projection is spliced at the cutting lines on a plane vertical to the thickness direction of the cell, and/or at least one complete pyramid projection is spliced at the cutting lines. The utility model discloses in, first section battery and second section battery are arranged in same whole solar cell, and are arranged in two section batteries of same line of cut both sides, and the performance uniformity of each isogenesis section battery among the isogenesis section battery group is good, has reduced hot spot, light and shade piece scheduling problem.

Description

Photovoltaic module and photovoltaic system

Technical Field

The utility model relates to a solar photovoltaic technology field especially relates to a photovoltaic module and photovoltaic system.

Background

At present, a whole solar cell is generally cut to obtain a sliced cell, and the sliced cell is used to form a photovoltaic module, so as to improve the applicability of the solar cell.

In the existing photovoltaic module, the performance consistency of adjacent sliced cells is poor, the problems of hot spots, bright and dark slices and the like are easy to occur, and even the product is scrapped.

SUMMERY OF THE UTILITY MODEL

The utility model provides a photovoltaic module and photovoltaic system aims at solving photovoltaic module, and adjacent section battery performance uniformity is relatively poor, appears the problem of hot spot, light and shade piece etc. easily.

A first aspect of the present invention provides a photovoltaic module, including: a plurality of battery strings arranged in a string array; the battery string includes: a plurality of battery pieces which are connected in series in sequence;

in the plurality of battery slices connected in series in sequence, at least one homologous slicing battery group exists, and the homologous slicing battery group comprises: a plurality of adjacent homologous sliced cells; a first sliced cell in one of the homologous sliced battery packs, and a second sliced cell in the remaining battery slices in the homologous sliced battery pack: after the two are spliced along the cutting lines, at least one complete pyramid projection is spliced at the cutting lines on a plane vertical to the thickness direction of the battery piece, and/or at least one complete pyramid projection is spliced at the cutting lines.

The utility model discloses in, the first section battery in a homologous section group battery, and the second section battery in the surplus battery piece in this homologous section group battery: after the two are spliced along the cutting lines, at least one complete pyramid projection is spliced at the cutting lines on a plane vertical to the thickness direction of the cell, and/or at least one complete pyramid projection is spliced at the cutting lines. In general, after two sliced cells located in the same whole solar cell and located at two sides of the same cutting line are spliced along the cutting line, at least one complete pyramid projection can be spliced at the cutting line on a plane perpendicular to the thickness direction of the cell, and/or at least one complete pyramid projection can be spliced at the cutting line. Then, the first sliced battery and the second sliced battery in the homologous sliced battery set are positioned in the same whole solar battery and positioned in two sliced batteries on two sides of the same cutting line, a plurality of adjacent homologous sliced batteries in the homologous sliced battery set are all from the same whole solar battery, the performance consistency of each homologous sliced battery in the homologous sliced battery set is good, the performance matching effect is good, the performance consistency of the adjacent sliced batteries is greatly improved, and the problems of hot spots, light and dark sheets and the like are obviously reduced.

Optionally, the first sliced cell and the second sliced cell in one of the homologous sliced cell groups are distributed in close proximity, the cutting lines of the first sliced cell and the second sliced cell are distributed in close proximity, and the first sliced cell and the second sliced cell are spliced along the cutting lines distributed in close proximity to form at least one part of a whole solar cell.

Optionally, all the homologous sliced cells in one homologous sliced cell group are sequentially spliced according to the arrangement sequence in the plurality of sequentially connected cells in series along the cutting line of each homologous sliced cell to form at least one part of a whole solar cell.

Optionally, all the homologous sliced cells in one homologous sliced cell group are spliced along the cutting line of each homologous sliced cell according to the placing direction in the plurality of cell pieces connected in series in sequence to form at least one part of one whole solar cell.

Optionally, in one of the homologous sliced battery packs, the number of pairs of the first sliced battery and the second sliced battery is greater than or equal to 2, and at least two pairs of the homologous sliced battery that share the first sliced battery or the second sliced battery are provided.

Optionally, after the first sliced battery and the second sliced battery are spliced along the cutting lines thereof, at least one complete three-dimensional pyramid is spliced at the cutting lines, and/or at least one complete three-dimensional pyramid base is spliced at the cutting lines.

Optionally, a first included angle between the cutting line of the first cut-off battery and the line mark on the first cut-off battery is greater than or equal to 0 ° and less than or equal to 5 °.

Optionally, in one of the homologous slicing battery packs, a second included angle between the cutting line of the first slicing battery and the line mark on the second slicing battery is equal to the first included angle.

Optionally, a third included angle between the cutting line of the first sliced battery and the line mark on the third sliced battery in another homologous sliced battery set is equal to the first included angle.

Optionally, in any one of the first sliced battery and the second sliced battery, on a plane perpendicular to the thickness direction of the battery piece, the area of the projection of the residual tower footing at the cutting line is greater than or equal to 1/3 of the area of the projection of one complete tower footing on the plane;

and/or in any one of the first sliced battery and the second sliced battery, on a plane vertical to the thickness direction of the battery piece, the area of the projection of the pyramid remained at the cutting line is more than or equal to 1/3 of the area of the projection of one complete pyramid on the plane.

Optionally, in any one of the first sliced battery and the second sliced battery, the volume of the residual tower footing at the cutting line is greater than or equal to 1/3 of the volume of one complete tower footing;

and/or in any one of the first sliced battery and the second sliced battery, the volume of the residual pyramid at the cutting line is more than or equal to 1/3 of the volume of one complete pyramid.

Optionally, the photovoltaic module further includes: electrically conductively interconnecting in-string conductive interconnects of adjacent homologous sliced cells; the extending direction of interconnection spare in the cluster with the fourth contained angle of the line mark on the first slice battery, with first contained angle is complementary, or, the extending direction of interconnection spare in the cluster with the fourth contained angle of the line mark on the first slice battery, with first contained angle equals.

Optionally, the photovoltaic module further includes: an inter-string conductive interconnection member conductively interconnecting adjacent battery strings; the extending direction of the inter-string conductive interconnection piece and the fifth included angle of the line mark on the first slice battery are equal to the first included angle, or the extending direction of the inter-string conductive interconnection piece and the fifth included angle of the line mark on the first slice battery are complementary to the first included angle.

A second aspect of the embodiments provides a photovoltaic system, include: a number of any of the foregoing photovoltaic assemblies.

The photovoltaic system has the same or similar beneficial effects as the photovoltaic module, and the details are not repeated herein in order to avoid repetition.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 shows a schematic structural diagram of a battery string of a first photovoltaic module in an embodiment of the present invention;

fig. 2 is a partially enlarged schematic structural diagram of a first slice battery and a second slice battery under an optical microscope according to an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a battery string of a second photovoltaic module in an embodiment of the present invention;

fig. 4 shows a schematic structural diagram of a cell string of a third photovoltaic module in an embodiment of the present invention;

fig. 5 shows a schematic structural diagram of a battery string of a fourth photovoltaic module in an embodiment of the present invention;

fig. 6 shows a schematic structural diagram of a battery string of a fifth photovoltaic module in an embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a first monolithic solar cell in an embodiment of the present invention;

fig. 8 shows a schematic structural diagram of a second monolithic solar cell in an embodiment of the invention;

fig. 9 shows a schematic structural diagram of a third monolithic solar cell in an embodiment of the present invention.

Description of reference numerals:

1-string, 11-homologous diced cell group, 111-first diced cell, 112-second diced cell, 12-full-wafer solar cell, 121-cut line, 13-scribe.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The inventor finds that in the photovoltaic module in the prior art, the performance consistency of adjacent sliced cells is poor, and hot spots, bright and dark slices and other problems are easy to occur, and even the main reasons for product scrap are as follows: in a plurality of battery slices which are connected in series in sequence, the sources of adjacent sliced batteries are disordered, and the influence of the sources of the adjacent sliced batteries on the performance of a photovoltaic module and the like are not considered in the prior art. However, in the preparation process of different whole solar cells, due to process condition limitation and the like, performance consistency is difficult to achieve, among a plurality of cells connected in series in sequence, the sources of adjacent sliced cells are disordered, which can cause poor performance consistency of the adjacent sliced cells, the sliced cell with relatively low performance can become the load of the sliced cell with relatively high performance, the sliced cell with relatively low performance is easy to heat, and the problems of hot spots, light and dark sheets and the like are easy to occur, so that the reliability is low.

Fig. 1 shows a schematic structural diagram of a battery string of a first photovoltaic module in an embodiment of the present invention. Fig. 2 shows a first sliced battery and a second sliced battery in an embodiment of the present invention, and a partially enlarged structural schematic diagram under an optical microscope. Fig. 3 shows a schematic structural diagram of a battery string of a second photovoltaic module in an embodiment of the present invention. Fig. 4 shows a schematic structural diagram of a cell string of a third photovoltaic module in an embodiment of the present invention. Fig. 5 shows a schematic structural diagram of a battery string of a fourth photovoltaic module in an embodiment of the present invention. Fig. 6 shows a schematic structural diagram of a battery string of a fifth photovoltaic module in an embodiment of the present invention. Fig. 7 shows a schematic structural diagram of a first monolithic solar cell in an embodiment of the present invention. Fig. 8 shows a schematic structural diagram of a second monolithic solar cell in an embodiment of the present invention. Fig. 9 shows a schematic structural diagram of a third monolithic solar cell in an embodiment of the present invention. Fig. 1, 3 to 9 may be schematic views looking from the light-facing surface to the backlight surface of the photovoltaic module, or may be schematic views looking from the backlight surface to the light-facing surface. The light-facing surface here may be the surface of the photovoltaic module that mainly receives light, and the backlight surface and the light-facing surface are distributed relatively.

Referring to fig. 1 and 3 to 6, the photovoltaic module includes a plurality of cell strings 1 arranged in a string array. The battery string 1 includes: a plurality of battery pieces which are connected in series in sequence. The number of rows, the number of columns and the number of battery strings in the battery string array arrangement are not specifically limited, the number of a plurality of battery pieces which are sequentially connected in series and are included in the battery string 1 is not specifically limited, and whether the battery pieces which are connected side by side are included in the battery string 1 or not is not specifically limited. For example, in fig. 1, the left-right direction is defined as a row, the up-down direction is defined as a column, the extending direction of the battery string 1 is along the direction parallel to the column, the battery string array is 18 rows and 6 columns, and one battery string 1 includes 18 battery pieces connected in series in sequence.

The plane perpendicular to the thickness direction of the battery piece can be a light facing surface and/or a backlight surface. In a plurality of battery pieces connected in series in sequence, at least one homologous sliced battery group 11 exists, as shown in fig. 1, 3 to 6, the part enclosed by the dashed line may be one homologous sliced battery group 11. The homologous slicing battery 11 includes: a plurality of adjacent homologous sliced cells. The number of the same-source sliced cells included in one same-source sliced battery group 11 is not particularly limited. For example, in fig. 1 and 3, the homologous slicing battery pack 11 outlined by a dashed frame includes 2 homologous slicing batteries. In fig. 4, the homologous skived battery 11, which is outlined by a dashed box, includes 3 homologous skived cells. In fig. 5 and 6, the homologous slicing battery 11 outlined by a dotted frame includes 4 homologous slicing batteries.

Referring to fig. 2, under an optical microscope, a first sliced cell 111 in one homologous sliced cell group and a second sliced cell 112 in the remaining cell pieces in the homologous sliced cell group 11 were observed: after the two are spliced along the cutting lines, at least one complete pyramid projection is spliced at the cutting lines on a plane vertical to the thickness direction of the cell, and/or at least one complete pyramid projection is spliced at the cutting lines. The specific type of the optical microscope, and the test conditions are not particularly limited.

For example, as shown in fig. 2, under an optical 3D microscope, under observation conditions in which the magnification of the objective lens is 50 times and the magnification of the eyepiece lens is 20 times, a first sliced cell 111 in one homologous sliced cell group and a second sliced cell 112 in the remaining cell pieces in the homologous sliced cell group 11 are observed: after the two are spliced along the cutting lines, on a plane vertical to the thickness direction of the cell, the cutting lines are spliced into a plurality of complete tower footing projections.

In general, after two sliced cells located in the same whole solar cell and located at two sides of the same cutting line are spliced along the cutting line, at least one complete pyramid projection can be spliced at the cutting line on a plane perpendicular to the thickness direction of the cell, and/or at least one complete pyramid projection can be spliced at the cutting line. Then, the first sliced cell 111 and the second sliced cell 112 in the homologous sliced cell group 11 are two sliced cells located in the same whole solar cell and located at two sides of the same cutting line, a plurality of adjacent homologous sliced cells in the homologous sliced cell group 11 all come from the same whole solar cell, the performance consistency of each homologous sliced cell in the homologous sliced cell group is good, the performance matching effect is good, the performance consistency of adjacent sliced cells is greatly improved, and the problems of hot spots, light and dark slices and the like are obviously reduced.

For example, after the first sliced battery 111 and the second sliced battery 112 in the homologous sliced battery 11 are spliced along the cutting lines thereof, 3 complete pyramid projections are spliced on a plane perpendicular to the thickness direction of the battery slice, for example, at the cutting lines of the light-facing surface, and 3 complete pyramid projections are spliced at the cutting lines of the backlight surface.

It should be noted that, on a plane perpendicular to the thickness direction of the battery piece, the number of complete pyramid projections spliced at the cutting line is specifically not specifically limited, and/or the number of complete pyramid projections spliced at the cutting line is not specifically limited. The pyramid base may be the portion of the pyramid that remains after the pyramid is sharpened.

In the same-source sliced battery group 11, the relative positions of the first sliced battery 111 and the second sliced battery 112 are not particularly limited. For example, in fig. 1, 3, 4, and 5, the first sliced cell 111 and the second sliced cell 112 are adjacently disposed.

The type of the battery sheet and the like are not particularly limited. For example, the cell sheet may be a back contact solar cell sheet. Further, for example, the cell sheet may be an HPBC cell, which is a hybrid passivated back contact solar cell sheet. In the HPBC cell, P regions and N regions alternate in a plane in a direction perpendicular to the thickness of the cell sheet. For the back contact solar cell, the in-string interconnection pieces which are conductively connected with the adjacent cells in one cell string 1 are basically positioned on the backlight surface of the back contact solar cell, so that shading can be reduced, and the power generation efficiency is improved.

The shape of the complete tower footing projection can be rectangular, and the like, and the size of the tower footing projection is not particularly limited. The shape of the complete pyramid projection and the like are not particularly limited.

The first sliced battery 111 and the second sliced battery 112 have a corresponding relationship. In the homologous skived battery pack, as shown in fig. 1 and 3, there may be one second skived cell 112 corresponding to the first skived cell 111.

Optionally, as shown in fig. 1, 4, and 5, the first sliced cell 111 and the second sliced cell 112 in one homologous sliced cell group 11 are distributed in close proximity, and the cutting lines of the two sliced cells are distributed in close proximity, and the two sliced cells are spliced along the cutting lines distributed in close proximity to form at least a part of one whole solar cell, the distance between the first sliced cell 111 and the second sliced cell 112 in the homologous sliced cell group 11 is closer, and the performance consistency is better, that is, the arrangement order and the placement direction of the first sliced cell 111 and the second sliced cell 112 in the homologous sliced cell group 11 are more consistent with the arrangement order and the placement direction of the first sliced cell 111 and the second sliced cell 112 in the whole solar cell 12 before cutting, and the appearance is better.

For example, the first sliced cell 111 and the second sliced cell 112 in a homologous sliced cell group 11 shown in fig. 1 are arranged closely and the cutting lines 121 of the two are arranged closely, and the two are spliced along the closely distributed cutting lines 121 to form a whole solar cell 12 shown in fig. 7. For another example, in a homologous dicing cell group 11 shown in fig. 4, a first dicing cell 111 and a second dicing cell 112 are arranged in close proximity, and the dicing lines 121 of the two are arranged in close proximity, and the two are spliced along the cutting lines 121 arranged in close proximity to each other to form a part of a whole solar cell 12 as shown in fig. 8. In a homologous sliced cell group 11 shown in fig. 5, a first sliced cell 111 and a second sliced cell 112 are arranged in close proximity, and the cutting lines 121 of the two are arranged in close proximity, and the two are spliced along the cutting lines 121 arranged in close proximity to form a part of a whole solar cell 12 as shown in fig. 9.

Alternatively, as shown in fig. 1, 4, and 5, all the homologous dicing cells in one homologous dicing cell group 11 are sequentially spliced along the cutting line 121 of each homologous dicing cell according to the arrangement order in the plurality of cells connected in series in sequence, so as to form at least a part of one whole solar cell. The distance between the first sliced cell 111 and the second sliced cell 112 in the homologous sliced cell group 11 is closer, the performance consistency is better, and the arrangement sequence of the first sliced cell 111 and the second sliced cell 112 in the homologous sliced cell group 11 is higher in consistency with the arrangement sequence of the first sliced cell 111 and the second sliced cell 112 in the whole solar cell 12 before cutting, so that the beauty is better.

For example, all the first sliced cells 111 and the second sliced cells 112 in a homologous sliced cell group 11 shown in fig. 1 are sequentially spliced along the cutting lines 121 according to the arrangement sequence in a plurality of cell slices which are sequentially connected in series to form a whole solar cell 12 shown in fig. 7. For another example, all the first sliced cells 111 and the second sliced cells 112 in a homologous sliced cell group 11 shown in fig. 4 are sequentially spliced along the cutting lines 121 according to the arrangement sequence in the plurality of cell slices connected in series in sequence, so as to form a whole solar cell 12 shown in fig. 8. All the first sliced cells 111 and the second sliced cells 112 in the same source sliced cell group 11 shown in fig. 5 are sequentially spliced along the cutting lines 121 according to the arrangement sequence in the plurality of cell slices which are sequentially connected in series to form a whole solar cell 12 shown in fig. 9.

It should be noted that, after all the homologous sliced cells in the homologous sliced cell group 11 are sequentially spliced according to the arrangement sequence in the plurality of cells sequentially connected in series along the cutting line 121 of each homologous sliced cell, at least a part of a whole solar cell is formed, and in the splicing process, whether the solar cell rotates or turns over is not specifically limited, and it is only required to ensure that the arrangement sequence of each cell in the plurality of cells sequentially connected in series is not changed.

Optionally, all the homologous sliced cells in one homologous sliced cell group 11 are spliced along the cutting line 121 of each homologous sliced cell according to the placement direction in a plurality of cell slices connected in series in sequence to form at least one part of one whole solar cell. The placing direction here means that whether the homologous slicing battery is placed in a plurality of battery slices which are connected in series in sequence in a non-overturning or non-rotating mode is not specifically limited by changing or changing the arrangement sequence. The distance between the first sliced cell 111 and the second sliced cell 112 in the homologous sliced cell group 11 is closer, the performance consistency is better, and the consistency between the placing direction of the first sliced cell 111 and the second sliced cell 112 in the homologous sliced cell group 11 and the placing direction of the first sliced cell 111 and the second sliced cell 112 in the whole solar cell 12 before cutting is higher, and the aesthetic property is better.

Alternatively, as shown in fig. 4, 5, and 6, in an homologous sliced battery 11, the number of pairs of the first sliced battery 111 and the second sliced battery 112 is greater than or equal to 2, that is, in an homologous sliced battery 11, after splicing along the cutting lines 121 of the two, on a plane perpendicular to the thickness direction of the battery slice, at least one complete pyramid projection is spliced at the cutting lines 121, and/or the number of pairs of homologous sliced batteries at least one complete pyramid projection is spliced at the cutting lines 121 is greater than or equal to 2. In other words, the first sliced cells 111 and the second sliced cells 112 have a corresponding relationship. In the homologous sliced battery 11, one first sliced battery 111 can correspond to one or more second sliced batteries 112, and one second sliced battery 112 can correspond to one or more first sliced batteries 111. And at least two pairs of splicing pairs sharing the first sliced cell 111 or the second sliced cell 112 are provided in the homologous sliced cell group 11, all homologous sliced cells in the at least two pairs of splicing pairs sharing the first sliced cell 111 or the second sliced cell 112 are from the same whole solar cell, and the performance consistency of all homologous sliced cells in the at least two pairs of splicing pairs is better.

For example, in fig. 4, in the last battery string in the left-to-right direction, the first sliced battery, the second sliced battery, and the third sliced battery are connected in series in the top-to-bottom direction, and the total of three sliced batteries is the same source sliced battery group 11. In the homologous sliced battery pack 11, the first sliced battery from top to bottom is used as a first sliced battery 111, and the second sliced battery from top to bottom is used as a second sliced battery 112, which form a spliced pair. In the homologous sliced battery pack 11, the second sliced battery from top to bottom is used as the second sliced battery 112, the third sliced battery from top to bottom is used as the first sliced battery 111, and the two are combined into a spliced pair. Then, the number of pairs of the same source sliced battery 11 is 2. The two pairs of splicing pairs share the second sliced battery from top to bottom, and the second sliced battery from top to bottom can be used as both the first sliced battery and the second sliced battery. Then, the three sliced cells in the homologous sliced cell group 11 are all from the same whole solar cell, and the performance consistency of all homologous sliced cells is better.

For another example, in fig. 5, in the last battery string in the left-to-right direction, the first sliced battery, the second sliced battery, the third sliced battery, and the fourth sliced battery, which are connected in series in the top-to-bottom direction, are all four sliced batteries, which are the same source sliced battery group 11. In the homologous sliced battery pack 11, the first sliced battery from top to bottom is used as a first sliced battery 111, and the second sliced battery from top to bottom is used as a second sliced battery 112, which form a first splicing pair. In the homologous sliced battery pack 11, the second sliced battery from top to bottom is used as the second sliced battery 112, the third sliced battery from top to bottom is used as the first sliced battery 111, and the two are combined into a second spliced pair. In the homologous sliced battery pack 11, the third sliced battery from top to bottom is used as the second sliced battery 112, the fourth sliced battery from top to bottom is used as the first sliced battery 111, and the third sliced battery and the first sliced battery form a fourth spliced pair. Then, the number of pairs of the same source sliced battery 11 is 3. In the homologous sliced battery pack, a first splicing pair and a second splicing pair which share a second sliced battery in the direction from top to bottom, and a second splicing pair and a third splicing pair which share a third sliced battery in the direction from top to bottom are provided. Then, the four sliced cells in the homologous sliced cell group 11 are all from the same whole solar cell, and the performance consistency of all homologous sliced cells is better.

For another example, in fig. 6, in the last battery string in the left-to-right direction, the first sliced battery, the second sliced battery, the third sliced battery, and the fourth sliced battery, which are connected in series in the top-to-bottom direction, are all four sliced batteries, which are the same source sliced battery group 11. In the homologous sliced battery pack 11, the first sliced battery in the top-to-bottom direction is used as a first sliced battery 111, and the third sliced battery in the top-to-bottom direction is used as a second sliced battery 112, which form a fourth spliced pair. In the homologous sliced battery pack 11, the second sliced battery from top to bottom is used as the second sliced battery 112, the fourth sliced battery from top to bottom is used as the first sliced battery 111, and the two are combined to form a fifth spliced pair. In the homologous sliced battery pack 11, the third sliced battery from top to bottom is used as the second sliced battery 112, the fourth sliced battery from top to bottom is used as the first sliced battery 111, and the third sliced battery and the first sliced battery form a sixth spliced pair. Then, the number of pairs of the same source sliced battery 11 is 3. In the homologous sliced battery group 11, there are a fourth spliced pair and a sixth spliced pair sharing a third sliced battery in the top-to-bottom direction, and a fifth spliced pair and a sixth spliced pair sharing a fourth sliced battery in the top-to-bottom direction. Then, the four sliced cells in the homologous sliced cell group 11 are all from the same whole solar cell, and the performance consistency of all homologous sliced cells is better.

Optionally, after the first sliced battery 111 and the second sliced battery 112 are spliced along the cutting line 121, at least one complete three-dimensional pyramid is spliced at the cutting line 121, and/or at least one complete three-dimensional pyramid base is spliced at the cutting line 121. That is, after the two cells are spliced along the cutting line 121, at least one complete pyramid projection is spliced at the cutting line 121, and/or, on the premise that at least one complete pyramid projection is spliced at the cutting line 121, at least one complete three-dimensional pyramid is spliced at the cutting line 121, and/or, at least one complete three-dimensional pyramid is spliced at the cutting line 121, so that the judgment on the homologous sliced cells is more diverse and strict, and the performance consistency of all homologous sliced cells in one homologous sliced battery pack is better.

The line mark 13 on the sliced battery is a mark left on the silicon wafer by the cutting line in the process of processing the silicon rod into the silicon wafer by the cutting line, and the mark is still remained on the battery through the battery and component processing technology. Optionally, referring to fig. 2, a first included angle between the cutting line 121 of the first cut cell 111 and the line mark 13 on the first cut cell 111 is greater than or equal to 0 ° and less than or equal to 5 °. That is, the cutting lines 121 of the first sliced cell 111 are as parallel as possible to the line marks 13 on the first sliced cell, and further, in a visual field of the optical microscope, on one hand, the number of the bases or pyramids remaining at the cutting lines 121 on the first sliced cell 111 is large, and on the other hand, the area or volume of the bases or pyramids remaining at the cutting lines 121 on the first sliced cell 111 is relatively large, which is beneficial for determining whether the complete pyramid projection and/or the pyramid projection can be pieced together at the cutting lines of the first sliced cell 111 and the second sliced cell 112, and meanwhile, the determination accuracy is higher.

For example, the first included angle between the cutting line 121 of the first cut cell 111 and the line mark 13 on the first cut cell may be 0 °,1 °, 2 °, 2.5 °, 3 °, 4 °, 4.4 °, 5 °

Alternatively, in a same source-sliced battery, the second angle between the cut line 121 of the first sliced battery 111 and the score 13 of the second sliced battery 112 is equal to the first angle between the cut line 121 of the first sliced battery 111 and the score 13 of the first sliced battery 111. That is, in a homologous sliced battery pack, the cutting line of the first sliced battery 111 is parallel to the line mark 13 of the second sliced battery 112, and further, the cutting line 121 of a homologous sliced battery is parallel to the line marks 13 of the remaining homologous sliced batteries, so that the line mark direction of each homologous sliced battery in a homologous sliced battery pack can be kept consistent. Furthermore, in a field of view of the optical microscope, on one hand, the number of the pyramid bases or the pyramids remaining at the cutting line 121 on each homologous slicing battery is large, and on the other hand, the area or the volume of the pyramid bases or the pyramids remaining at the cutting line 121 on each homologous slicing battery is relatively large, so that whether the complete pyramid projection and/or the pyramid projection can be spliced at the cutting line of the first slicing battery 111 and the second slicing battery 112 is favorably judged, and meanwhile, the judgment accuracy is higher. In the photovoltaic module or the cell string, the direction uniformity of the cutting lines 121 of the respective homologous sliced cells in the homologous sliced cell group 11 is high, the direction uniformity of the linear marks 13 is also high, and the appearance is good.

It should be noted that the angle ranges of the second included angle and the first included angle may also be other smaller angles different from the range from 0 ° to 5 °, for example, the second included angle may be greater than or equal to 0 °, smaller than or equal to 8 °, and the second included angle is equal to the first included angle. For example, the second included angle may be 0 °,1 °, 2 °, 2.5 °, 3.6 °, 4 °, 4.4 °, 5 °, 7 °, 8 °.

Optionally, the third included angle and the first included angle of the cutting line 121 of the first sliced battery 111 and the line mark 13 on the third sliced battery in another homologous sliced battery set are equal. Further, in the photovoltaic module or the same cell string, the cutting line 121 of each homologous sliced cell in one homologous sliced cell group is parallel to the line mark 13 of each homologous sliced cell in another homologous sliced cell group, and the line mark direction of each homologous sliced cell in one homologous sliced cell group and each homologous sliced cell in another homologous sliced cell group can be kept consistent. Furthermore, in a field of view of the optical microscope, on one hand, the number of the bases or the pyramids remaining at the cutting line 121 of each homologous sliced battery in each homologous sliced battery group is large, and on the other hand, the area or the volume of the bases or the pyramids remaining at the cutting line 121 of each homologous sliced battery in each homologous sliced battery group is relatively large, so that it is easy to determine whether the first sliced battery 111 and the second sliced battery 112 can be spliced into a complete pyramid projection and/or a pyramid projection at the cutting line, and the determination accuracy is higher. In the photovoltaic module or the battery string, the direction uniformity of the cutting lines 121 of the homologous sliced batteries in the homologous sliced battery group 11 is high, the direction uniformity of the line marks 13 is also high, and the appearance is good.

The angle ranges of the third included angle and the first included angle may also be other smaller angles different from the range of 0 ° to 5 °, for example, the third included angle may be greater than or equal to 0 °, smaller than or equal to 8 °, and the third included angle is equal to the first included angle. For example, the third included angle may be 0 °,1 °, 2 °, 2.5 °, 3.3 °, 4 °, 4.4 °, 5 °, 7 °, 8 °.

Optionally, in any one of the first sliced cell 111 and the second sliced cell 112, the area of the projection of the pyramid base remaining at the cutting line 121 on the plane perpendicular to the thickness direction of the cell is greater than or equal to 1/3 of the area of the projection of one complete pyramid base on the plane, that is, in any one of the first sliced cell 111 and the second sliced cell 112, the area of the projection of the pyramid base remaining at the cutting line 121 on the plane perpendicular to the thickness direction of the cell is relatively large, which is beneficial to determining whether the complete pyramid projection and/or the pyramid base projection can be pieced together at the cutting line of the first sliced cell 111 and the second sliced cell 112, and the determination accuracy is higher.

And/or in any one of the first sliced cell 111 and the second sliced cell 112, the area of the pyramid projection remained at the cutting line 121 on the plane perpendicular to the thickness direction of the cell is greater than or equal to 1/3 of the area of the projection of one complete pyramid on the plane, that is, in any one of the first sliced cell 111 and the second sliced cell 112, the area of the pyramid projection remained at the cutting line 121 on the plane perpendicular to the thickness direction of the cell is relatively larger, which is beneficial to determining whether the complete pyramid projection and/or the pyramid base projection can be spliced at the cutting line of the first sliced cell 111 and the second sliced cell 112, and meanwhile, the determination accuracy is higher.

For example, on a plane perpendicular to the thickness direction of the cell, the area of the tower base projection left at the cut line 121 of the first sliced cell 111 is 1/3, and the area of the tower base projection left at the cut line 121 of the second sliced cell 112 corresponding to the first sliced cell is 2/3. For another example, on a plane perpendicular to the thickness direction of the cell sheet, the area of the tower footing remaining at the cut line 121 of the first sliced cell 111 is 1/2, and the area of the tower footing remaining at the cut line 121 of the second sliced cell 112 corresponding to the first sliced cell is 1/2. For another example, on a plane perpendicular to the thickness direction of the cell, the area of the tower base projection remaining at the cut line 121 of the first sliced cell 111 is 2/5, and the area of the tower base projection remaining at the cut line 121 of the second sliced cell 112 corresponding to the first sliced cell is 3/5. For another example, on a plane perpendicular to the thickness direction of the cell, the area of the pyramid projection remaining at the cutting line 121 of the first sliced cell 111 is 1/3, and the area of the pyramid projection remaining at the cutting line 121 of the second sliced cell 112 corresponding to the first sliced cell is 2/3. For another example, on a plane perpendicular to the thickness direction of the cell, the area of the pyramid projection remaining at the cutting line 121 of the first sliced cell 111 is 3/7, and the area of the pyramid projection remaining at the cutting line 121 of the second sliced cell 112 corresponding to the first sliced cell is 4/7. For another example, on a plane perpendicular to the thickness direction of the cell, the area of the pyramid projection remaining at the cutting line 121 of the first sliced cell 111 is 3/8, and the area of the pyramid projection remaining at the cutting line 121 of the second sliced cell 112 corresponding to the first sliced cell is 5/8.

Optionally, in each of the first sliced cell 111 and the second sliced cell 112, the volume of the residual cell at the cutting line 121 is greater than or equal to 1/3 of the volume of one complete cell, that is, in each of the first sliced cell 111 and the second sliced cell 112, the volume of the residual cell at the cutting line 121 is relatively large, which is beneficial to determining whether the complete pyramid projection and/or the complete cell base projection can be formed at the cutting line of the first sliced cell 111 and the second sliced cell 112, and the determination accuracy is higher.

And/or in any one of the first sliced cell 111 and the second sliced cell 112, the volume of the pyramid remained at the cutting line 121 is greater than or equal to 1/3 of the volume of one complete pyramid, that is, in any one of the first sliced cell 111 and the second sliced cell 112, the volume of the pyramid remained at the cutting line 121 is relatively large, which is beneficial to determining whether the first sliced cell 111 and the second sliced cell 112 can be spliced into a complete pyramid projection and/or a pyramid base projection at the cutting line thereof, and meanwhile, the determination accuracy is higher.

Optionally, the photovoltaic module may further include: and a conductive interconnection piece (not shown) in the string for conductively interconnecting the adjacent homologous sliced cells, wherein the extending direction of the interconnection piece in the string is complementary to the fourth included angle of the line mark 13 on the first sliced cell 111 and the first included angle, that is, the sum of the fourth included angle and the first included angle is equal to 90 °, and further, in a visual field of an optical microscope, on one hand, the number of the residual pyramids or pyramids at the cutting line on one homologous sliced cell is large, and on the other hand, the area or volume of the residual pyramids or pyramids at the cutting line on one homologous sliced cell is relatively large, so that whether the complete pyramid projection and/or the pyramid projection can be spliced at the cutting line of the first sliced cell 111 and the second sliced cell 112 can be determined, and the determination accuracy is higher. The string of interconnections is not particularly limited, and may be solder strips, for example. For example, the first included angle may be 0.5 ° and the fourth included angle may be 89.5 °. The sliced battery may include: the collector grid lines (not shown in the figure) are used for collecting carriers, the collector grid lines are used for conducting the carriers on the collector grid lines which are electrically connected with the collector grid lines, and the extending direction of the collector grid lines can be parallel to the cutting lines. In this case, the extending direction of the conductive interconnections in the string may be parallel to the extending direction of the bus bar lines.

Optionally, the extending direction of the conductive interconnection piece in the string may be parallel to the extending direction of the collector grid line, the extending direction of the interconnection piece in the string is equal to the fourth included angle of the line mark 13 and the first included angle, and the optical microscope can still ensure that the conductive interconnection piece is within a visual field of the optical microscope, on one hand, the number of the residual bases or pyramids at the cutting line on one homologous sliced battery is large, and on the other hand, the area or volume of the residual bases or pyramids at the cutting line on one homologous sliced battery is relatively large, so that it is easy to determine whether the first sliced battery 111 and the second sliced battery 112 can be spliced into a complete pyramid projection and/or a pyramid projection at the cutting line, and the determination accuracy is higher. For example, the string of interconnects may be solder strips or the like. For example,

the first included angle and the fourth included angle may each be 0.5 °.

The angle ranges of the fourth included angle and the first included angle may also be other smaller angles different from the range from 0 ° to 5 °, for example, the fourth included angle may be greater than or equal to 0 ° and less than or equal to 8 °, and the fourth included angle is equal to the first included angle. For example, the fourth angle may be 0 °,1 °, 2.3 °, 2.5 °, 3 °, 4 °, 4.4 °, 5 °, 7 °, 8 °.

Optionally, the photovoltaic module may further include: the extension direction of the inter-string conductive interconnection piece is equal to the fifth included angle and the first included angle of the line mark 13 on the first sliced battery 111, so that in one visual field of an optical microscope, on one hand, the number of the residual bases or pyramids at the cutting line on one homologous sliced battery is large, and on the other hand, the area or the volume of the residual bases or pyramids at the cutting line on one homologous sliced battery is relatively large, thereby being beneficial to judging whether the complete pyramid projection and/or the pyramid projection can be spliced at the cutting line of the first sliced battery 111 and the second sliced battery 112, and meanwhile, the judgment accuracy is higher. The inter-string conductive interconnection is not particularly limited, and may be, for example, a bus bar or the like. In this case, the extending direction of the inter-string conductive interconnections may be parallel to the extending direction of the bus bar lines, and the extending direction of the intra-string conductive interconnections may be parallel to the extending direction of the bus bar lines.

Optionally, the extending direction of the inter-string conductive interconnection may be parallel to the extending direction of the collector gate line, and the extending direction of the intra-string conductive interconnection may be parallel to the extending direction of the collector gate line. At this time, the fifth included angle may be complementary to the first included angle, and still may be ensured within a field of view of the optical microscope, on one hand, the number of the residual bases or pyramids at the cutting line on one homologous sliced battery is large, and on the other hand, the area or volume of the residual bases or pyramids at the cutting line on one homologous sliced battery is relatively large, which is beneficial to determining whether the first sliced battery 111 and the second sliced battery 112 can be spliced into a complete pyramid projection and/or a pyramid projection at the cutting line, and meanwhile, the determination accuracy is higher.

The angle ranges of the fifth angle and the first angle may be other smaller angles different from the range of 0 ° to 5 °, for example, the fifth angle may be greater than or equal to 0 °, smaller than or equal to 8 °, and the fifth angle is equal to the first angle. For example, the fifth included angle may be 0 °,1 °, 2 °, 2.5 °, 3 °, 4 °, 4.4 °, 5 °, 7 °, 8 °.

The utility model also provides a photovoltaic system, this photovoltaic system can include the arbitrary aforementioned photovoltaic module of a plurality of, to a plurality of photovoltaic module's arrangement, lay all not do specifically to restrict such as position.

For example, the photovoltaic system may be a photovoltaic power plant formed by several photovoltaic modules arranged on the gobi, or several photovoltaic modules may be arranged on a building.

In the case of Photovoltaic modules arranged on a Building, the Photovoltaic modules herein may assume a Building function, and the Photovoltaic system may be a BIPV (Building Integrated Photovoltaic), specifically, a Photovoltaic system designed, constructed and installed simultaneously with the Building and perfectly combined with the Building, also referred to as "build-up" and "Building material" Photovoltaic systems. The energy-saving building has the functions of generating electricity, building components and building materials as a part of the external structure of the building, and can even improve the aesthetic feeling of the building and form a perfect unity with the building. Alternatively, the Photovoltaic system may also be a BAPV (building attached Photovoltaic), in particular attached to a building, also referred to as "installed" Photovoltaic system. Its main function is power generation, and it does not conflict with building function, and does not destroy or weaken original building function.

The photovoltaic system has the same or similar beneficial effects as any of the aforementioned photovoltaic modules, and the details are not repeated herein to avoid repetition.

It should be noted that, in this document, 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 phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (14)

1. A photovoltaic module, comprising: a plurality of battery strings arranged in a string array; the battery string includes: a plurality of battery pieces which are connected in series in sequence;

in a plurality of battery pieces that connect in series in proper order, there is at least one homologous slice group of batteries, homologous slice group of batteries includes: a plurality of adjacent homologous sliced cells; a first sliced cell in one of the homologous sliced battery packs, and a second sliced cell in the remaining battery slices in the homologous sliced battery pack: after the two are spliced along the cutting lines, at least one complete pyramid projection is spliced at the cutting lines on a plane vertical to the thickness direction of the battery piece, and/or at least one complete pyramid projection is spliced at the cutting lines.

2. The photovoltaic module according to claim 1, wherein the first sliced cell and the second sliced cell in one of the homologous sliced cell groups are arranged in close proximity and have their cutting lines arranged in close proximity, and the two sliced cells are spliced along their cutting lines arranged in close proximity to form at least a part of one whole solar cell.

3. The photovoltaic module according to claim 1, wherein all the homologous sliced cells in one homologous sliced cell group are sequentially spliced along the cutting line of each homologous sliced cell according to the arrangement sequence in the plurality of cell pieces sequentially connected in series to form at least a part of a whole solar cell.

4. The photovoltaic module according to claim 1, wherein all the homologous sliced cells in one homologous sliced cell group are spliced along the cutting line of each homologous sliced cell according to the placement direction in the plurality of cell slices connected in series in sequence to form at least a part of a whole solar cell.

5. The pv module of claim 1 wherein in one of the homologous sliced cell groups, the number of pairs of the first sliced cell and the second sliced cell is greater than or equal to 2, and there are at least two pairs of the homologous sliced cell group that share the first sliced cell or the second sliced cell.

6. The photovoltaic module according to claim 1, wherein the first sliced cell and the second sliced cell are spliced along the cutting line thereof to form at least one complete three-dimensional pyramid at the cutting line and/or at least one complete three-dimensional pyramid at the cutting line.

7. The photovoltaic module according to any one of claims 1 to 6, wherein a first included angle between a cutting line of the first cut cell and a line mark on the first cut cell is greater than or equal to 0 ° and less than or equal to 5 °.

8. The pv module according to claim 7 wherein in a said group of homologous diced cells, the second angle between the cut line of the first diced cell and the cut line of the second diced cell is equal to the first angle.

9. The photovoltaic module of claim 7, wherein the third included angle between the cut line of the first sliced cell and the cut line of the third sliced cell in another group of the same sliced cells is equal to the first included angle.

10. The photovoltaic module according to any one of claims 1 to 6, wherein in any one of the homologous sliced cells in the first sliced cell and the second sliced cell, the area of the projection of the residual tower footing at the cutting line on a plane perpendicular to the thickness direction of the cell sheet is more than or equal to 1/3 of the area of the projection of one complete tower footing on the plane;

and/or in any one of the first sliced battery and the second sliced battery, on a plane vertical to the thickness direction of the battery piece, the area of the projection of the pyramid remained at the cutting line is more than or equal to 1/3 of the area of the projection of one complete pyramid on the plane.

11. The photovoltaic module according to claim 6, wherein in any one of the first sliced cell and the second sliced cell, the volume of the residual tower footing at the cutting line is greater than or equal to 1/3 of the volume of one complete tower footing;

and/or in any homologous sliced battery in the first sliced battery and the second sliced battery, the volume of the residual pyramid at the cutting line is more than or equal to 1/3 of the volume of a complete pyramid.

12. The photovoltaic module of claim 7, further comprising: electrically conductively interconnecting in-string conductive interconnects of adjacent homologous sliced cells; the extending direction of electrically conductive interconnection in the cluster with the fourth contained angle of the line mark on the first slice battery, with first contained angle is complementary, or, the extending direction of electrically conductive interconnection in the cluster with the fourth contained angle of the line mark on the first slice battery, with first contained angle equals.

13. The photovoltaic module of claim 7, further comprising: an inter-string conductive interconnection member conductively interconnecting adjacent battery strings; the extending direction of the inter-string conductive interconnection piece and the fifth included angle of the line mark on the first slice battery are equal to the first included angle, or the extending direction of the inter-string conductive interconnection piece and the fifth included angle of the line mark on the first slice battery are complementary to the first included angle.

14. A photovoltaic system, comprising: a number of photovoltaic modules as claimed in any one of claims 1 to 13.

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