WO2021008474A1

WO2021008474A1 - Solar cell and photovoltaic module

Info

Publication number: WO2021008474A1
Application number: PCT/CN2020/101553
Authority: WO
Inventors: 张国明; 陶爱兵
Original assignee: 苏州携创新能源科技有限公司; 无锡鼎森茂科技有限公司
Priority date: 2019-07-16
Filing date: 2020-07-13
Publication date: 2021-01-21
Also published as: CN110277460A

Abstract

Disclosed in the present invention are a solar cell and a photovoltaic module, relating to the field of photovoltaic technique. A front-side silver paste layer of a silicon wafer layer of the solar cell in the present application comprises a fine grid line and a main grid line connected thereto which form a main current area, and a transition grid line and a fine grid line connected thereto which form a transition current area; each transition grid line being connected to at least one main grid line, and the current of the transition current area flowing into the main grid line of the main current area through the transition grid line, so as to reduce the length of the main grid line, and increase the light receiving area of the solar cell, so that the usage amount of silver paste can be reduced, and the power generation efficiency of the solar cell can be improved. The solar cells in the present application are connected in series and parallel to form a cell plate, and several cell plates are assembled to form the photovoltaic module in the present application; and the photovoltaic module has a high power generation efficiency, low material costs, and low process requirements, and can implement fully automated unmanned operation, thereby improving production efficiency and improving the yield of the photovoltaic module.

Description

Solar cells and photovoltaic modules

Technical field

The embodiment of the present invention relates to the field of photovoltaics, in particular to a solar cell and a photovoltaic module.

Background technique

With the rise in the price of traditional energy, the development and utilization of new energy has become the main topic of research in the energy field. Because solar energy has no pollution, no geographical restrictions, inexhaustible access, etc., the use of solar cells to generate electricity is becoming more and more popular.

In order to reduce the electrical loss of the cells, it is necessary to print denser thin grid lines and thicker bus bars on the cells. The conventional whole cell size is 156~166mm. The larger the cell size, the fine grid lines are required. The larger the number of and busbar lines, this will greatly increase the amount of solar cell silver paste and reduce the solar cell’s light-receiving area. The increased solar cell silver paste greatly increases the cost of the cell and the solar cell’s light-receiving area Reduction will reduce the overall power generation of the cells. How to balance the power generation efficiency of the slicing cells and the cost of the cells is a major problem in the current cell production process.

The existing conventional photovoltaic modules use whole or half cells, and the cells are connected in series, and the circuit is protected by 3 diodes. Each diode protects two strings of cells. When the cells are blocked or the circuit occurs When damaged, the diode works and separates the corresponding two battery strings. The actual power generation of the photovoltaic module is only 1/3 of the design, which seriously affects the actual power generation. In order to improve the high conversion efficiency of photovoltaic modules, the hotspot of module design in the market is the shingled module technology product without welding ribbon. The advantage of shingled products is indeed that the conversion efficiency of the module is very high, but the biggest short board of the shingled without solder ribbon on the surface is the hidden crack of the photovoltaic module to the cell, especially the hidden crack in the vertical direction of the string. If the hidden crack extends, the most Bad can cause the entire battery string to fail, and the entire photovoltaic module is scrapped. This design flaw greatly limits the true large-scale use of products, and the cost of shingles is also high.

technical problem

Shingled module technology products without solder ribbon on the surface are prone to cell cracks, especially vertical cracks in the longitudinal direction of the string. If the cracks extend, the entire cell string will fail at worst and the photovoltaic module will be scrapped as a whole.

Technical solutions

A solar cell sheet comprising a silicon sheet layer, a front silver paste layer on the front side of the silicon sheet layer, and a back silver paste layer on the back side of the silicon sheet layer;

The front silver paste layer includes main grid lines and fine grid lines constituting the main current region, and transition grid lines and fine grid lines constituting the transition current region, each of the transition grid lines is connected to at least one of the main grid lines respectively. Wire connection; the thin gate lines of the main current area are respectively connected to the main gate lines; the thin gate lines of the transition current area are respectively connected to the transition gate lines.

A further technical solution is that the width of the transition gate line decreases from an end connected to the main gate line to an end far away from the main gate line.

A further technical solution is that the transition gate line has an irregular shape.

A further technical solution is that the thin gate lines in the transition current region are linear.

A further technical solution is that the thin grid lines in the transition current region are arc-shaped.

A further technical solution is that the solar cell slice is 1/2 slice, 1/3 slice, 1/4 slice, 1/5 slice, 1/6 slice, 1/7 slice, or 1 /8 slice or 1/9 slice or 1/10 slice or 1/12 slice.

A further technical solution is that the width of the transition gate line is larger than the width of the thin gate line and smaller than the width of the main gate line.

A further technical solution is that the width of the thin grid lines in the front silver paste layer is 0.01 mm to 0.06 mm, and the width of the main grid lines is 0.3 mm to 0.8 mm.

A further technical solution is that, in the transition current zone, a number of transition gate lines are connected at positions other than the ends on part of the transition gate lines, or each transition gate line is also connected at positions other than the ends There are several transition gate lines, and the number of other transition gate lines connected to each transition gate line is the same or different.

A photovoltaic module comprising a front panel, a cell sheet layer, a back panel and an adhesive film layer, and the front panel, the cell layer and the back panel are bonded into a whole through the adhesive film layer;

The battery sheet layer includes M battery plates, the two ends of the M battery plates are connected by bus bars to form a series structure, and each battery plate includes N battery strings, M≥1 and N≥1, the same The two ends of the N battery strings in a battery plate block are connected by bus bars to form a parallel structure. Each battery string includes K solar cells, and each solar cell uses the solar cell disclosed in this application, The K solar cells are arranged in sequence and connected in series by inter-chip interconnecting strips to form a battery string, each of the inter-chip interconnecting strips covers the main grid lines in two adjacent solar cells but does not cover the transition grid lines, K is Integer.

A further technical solution is that the projection areas of two adjacent solar cell sheets in the battery string do not overlap or overlap.

A further technical solution is that the solar cells in the N battery strings in each battery block are also connected by L inter-string interconnecting bars to form a parallel structure, where L is an integer, and each battery block is A protection diode is connected between the two inter-string interconnecting bars, and/or a protection diode is connected between the bus bar and the inter-string interconnecting bar.

A further technical solution thereof is that each of the protection diodes is built into the battery slice layer, or is arranged outside the battery slice layer and is electrically connected to the battery slice layer.

Beneficial effect

This application discloses a solar cell and a photovoltaic module based on the solar cell. The main current area and the transition current area are provided on the silver paste layer on the front of the solar cell. The main current area includes thin grid lines and main grid lines. The transition current area includes transition grid lines and thin grid lines. There is no main grid line in the transition current area. The current from the transition current area flows into the main current area. The current is relatively small. The current in the transition current area flows into the main current area through the transition gate line. The bus bar reduces the length of the bus bar, increases the light-receiving area of the solar cell, reduces the amount of silver paste, and improves the power generation efficiency of the solar cell.

Multiple solar cells are connected in series through inter-chip interconnecting strips to form a battery string. The battery strings are connected in parallel to form an independent battery block. Single cell blocks or multiple battery blocks in series can be used to form a cell layer to form a photovoltaic module, which can improve the photovoltaic module. High power generation efficiency, lower photovoltaic module material costs, low requirements on photovoltaic module process, can realize fully automated unmanned operation, improve production efficiency, and increase the yield of photovoltaic modules.

Each independent battery block can also be equipped with multiple inter-string interconnecting bars, and connecting protection diodes between the inter-string interconnecting bars and between the inter-string interconnecting bars and the bus bars. Each diode corresponds to a diode segmentation area. Isolate the diode segment corresponding to the shaded area to ensure normal power generation in other areas, thereby improving the performance of the entire photovoltaic module and increasing power generation efficiency.

Description of the drawings

Fig. 1 is a schematic front view of a solar cell according to an exemplary embodiment;

Fig. 2 is a schematic diagram showing the connection between a main gate line and a transition gate line according to an exemplary embodiment;

Fig. 3 is a schematic diagram showing the connection of a transition gate line according to an exemplary embodiment;

Fig. 4 is a schematic diagram showing the connection of another transition gate line according to an exemplary embodiment;

Fig. 5 is a partial front view of a photovoltaic module according to an exemplary embodiment;

Fig. 6 is a front partial schematic view showing another photovoltaic module according to an exemplary embodiment;

Fig. 7 is a partial front view of another photovoltaic module according to an exemplary embodiment;

Fig. 8 is a partial front view of another photovoltaic module according to an exemplary embodiment;

Fig. 9 is a partial front view of another photovoltaic module according to an exemplary embodiment;

Fig. 10 is a front partial schematic diagram showing another photovoltaic module according to an exemplary embodiment;

Fig. 11 is a partial front view of another photovoltaic module according to an exemplary embodiment;

Fig. 12 is a front partial schematic diagram showing another photovoltaic module according to an exemplary embodiment;

Fig. 13 is a partial front view of another photovoltaic module according to an exemplary embodiment;

Fig. 14 is a front partial schematic diagram showing another photovoltaic module according to an exemplary embodiment;

Fig. 15 is a partial front view of another photovoltaic module according to an exemplary embodiment;

Figure 16 is a partially enlarged structural view of the structure shown in Figure 15;

Fig. 17 is a partial schematic side view showing a photovoltaic module according to an exemplary embodiment;

Fig. 18 is a partial schematic side view showing a battery string according to an exemplary embodiment;

Fig. 19 is a partial schematic side view showing another battery string according to an exemplary embodiment;

Fig. 20 is a structural diagram of a photovoltaic module according to an exemplary embodiment;

Fig. 21 is a structural diagram showing another photovoltaic module according to an exemplary embodiment;

Fig. 22 is a structural diagram of another photovoltaic module according to an exemplary embodiment.

Embodiments of the invention

The embodiment of the present invention provides a solar cell sheet, which includes a silicon sheet layer, a front silver paste layer on the front side of the silicon sheet layer, and a back silver paste layer on the back side of the silicon sheet layer.

As shown in FIG. 1, the front silver paste layer includes main grid lines 11 and fine grid lines 12 constituting the main current region 10, and transition gate lines 21 and fine grid lines 22 constituting the transition current region 20.

Each transition grid line 21 is connected to at least one bus grid line 11, and one end of each bus grid line 11 is connected to at least one transition grid line 21. The end of the main gate line 11 close to the transition current area 20 is connected to the transition gate line 21, and the end of the main gate line 11 far away from the transition current area 10 is not connected to the transition gate line 21.

For example, one end of each bus bar 11 is connected to five transition grid lines 21, as shown in Figure 1, Figure 5, Figure 6, and Figure 7; one end of each bus line 11 is connected to three transition grid lines 21 8 and 10; one end of each main grid line 11 is connected to two transition grid lines 21, as shown in Figure 9. The drawings in this application are merely illustrative, and the number of transition grid lines in the solar cell is not limited.

The thin gate lines 12 of the main current region 10 are respectively connected to the main gate lines 11. The thin gate lines 22 of the transition current zone 20 are respectively connected to the transition gate lines 21, wherein one side of the transition gate line 21 adjacent to the main current zone 10 is connected to the thin gate lines 22 in the transition current zone 20 and is not connected to the current Both sides of the transition gate lines adjacent to the region 10 are connected to the thin gate lines 22 in the transition current region 20. The included angle between the thin gate line 22 of the transition current region 20 and the transition gate line 21 can be determined according to actual needs, which is not limited in the embodiment of the present invention.

Each of the fine grid lines in the main current area 10 and the transition current area 20 is used to collect the current generated by the solar cell after receiving light, and each of the thin grid lines 22 in the transition current area 20 is used to deliver the collected current to the connected transition grid. Line 21, each transition gate line 21 is used to collect the current on the thin gate line 22 connected to the transition gate line 21 and deliver the collected current to the connected main gate line 11. Each of the fine gate lines 12 of the main current area 10 is used to deliver the collected current to the connected main gate line 11, and the main gate line 11 is used to collect the current of each fine gate line 12 and each transition gate line 21 connected to it.

In one case, the width of the transition gate line 21 decreases from the end connected to the main gate line 11 to the end away from the main gate line 11, as shown in FIG. 2; in this case, the transition gate line 21 is linear . In another case, the transition gate line 21 has an irregular shape, such as a curve shape or a broken line shape. All the transition gate lines 21 in the transition current region 20 have the same shape, or some of the transition gate lines 21 have the same shape, and some of the transition gate lines 21 have different shapes, or the shapes of the transition gate lines 21 are different; The example does not limit this.

In the present application, the width of each fine gate line in the main current region 10 and the transition current region 20 is 0.01 mm to 0.06 mm, the width of the main gate line 11 is 0.3 mm to 0.8 mm; the width of the transition gate line 21 is larger than the thin The width of the gate line is smaller than the width of the main gate line 11.

Optionally, in the transition current zone 20, a number of transition gate lines 21 are connected to positions other than the ends of the transition gate line 21, which may be connected to one transition gate line 21, as shown in FIG. 3, or At least two transition gate lines 21 are connected, as shown in FIG. 4. In actual implementation, part of the transition gate lines 21 in the transition current region 20 are also connected to other transition gate lines, or each transition gate line 21 is connected to other transition gate lines, or each transition gate line 21 No other transition gate lines are connected, and the number of other transition gate lines connected to each transition gate line 21 may be the same or different.

In one case, the thin gate lines 22 in the transition current region 20 are linear, as shown in FIG. 5; in another case, the thin gate lines 22 in the transition current region 20 are arc-shaped, as shown in FIG. 6.

The solar cells provided by the embodiments of the present invention can also be divided into 1/2 slices or 1/3 slices or 1/4 slices or 1/5 slices or 1 according to the requirements for the solar cells. /6 slice or 1/7 slice or 1/8 slice or 1/9 slice or 1/10 slice or 1/12 slice.

For example: the solar cells used in Figures 5, 6, and 10 are 1/3 slices; the solar cells used in Figures 7, 8, and 9 are 1/2 slices; the solar cells used in Figure 11 The solar cells are 1/4 slices; the solar cells used in Figure 12, Figure 13 and Figure 14 are 1/5 slices.

It should be noted that, on each solar cell, the number of main grid lines can be 3-12, or other numbers, which are not limited in the embodiment of the present invention.

The patterns formed by the transition current region and the main current region shown in FIG. 5 to FIG. 14 are only exemplary, and the embodiment of the present invention does not limit this.

In actual use, the solar cell of the present application can adopt a more special structure. Please refer to the solar cell shown in FIG. 15, which takes the solar cell as 1/6 slice as an example. FIG. 16 is FIG. 15 Schematic diagram of a partial enlargement. In this structure, the main current region 10 is very small, and the transition current region 20 occupies most of the area. The main grid lines 11 and the thin grid lines 12 of the main current region 10 can be omitted. The thin grid lines of the transition current region 20 are respectively Connecting the transition gate line 21, the transition current region 20 also includes a rectangular gate line 23, and each transition gate line 21 is connected to the rectangular gate line 23 respectively. This structure can further reduce the amount of silver paste.

The embodiment of the present invention also provides a photovoltaic module based on the above-mentioned solar cells. Referring to FIG. 17, the photovoltaic module includes a front panel 31, a back panel 32, a cell layer 30 and an adhesive film layer 33. The front panel 31, the battery sheet layer 30, and the back panel 32 are bonded as a whole by the adhesive film layer 33. The front plate 31 is a transparent layer, and the material of the front plate 31 can be transparent glass or transparent polymer. The back plate 32 is not limited to a transparent material, and the material of the back plate 32 can be glass or polymer. The adhesive film layer 33 is filled on both sides of the battery sheet layer 30. The adhesive film layer 33 is made of EVA film, POE film, PVB film or silica gel, etc., used to wrap the battery sheet layer 30 and combine the front plate 31 with The back plate 32 is bonded as a whole.

The solar cell layer 30 includes a plurality of solar cells 1 in the present application. K solar cells 1 are arranged in sequence and connected in series by inter-chip interconnecting strips 40 to form a battery string. K is an integer, and two of each inter-chip interconnecting strip 40 The ends are connected to two adjacent solar cells 1, as shown in Figs. 18 and 19. One end of the inter-chip interconnection bar 40 is connected to the main grid line 11 of the light-receiving surface of a solar cell 1, that is, the inter-chip interconnection bar passes through the The main current area 10 on the light-receiving surface of the solar cell 1 does not pass through the transition current area 20, and the other end of the inter-chip interconnecting strip 40 is connected to the main grid line 11 on the backlight surface of the adjacent solar cell 1. Because the inter-chip interconnection bar 40 is welded to the main grid line 11 of the solar cell 1, the current on the main grid line can be drawn, and the inter-chip interconnection bar 40 does not cover the transition grid line and does not pass through the transition current area, so the solar cell The current in the transition current area of the sheet 1 can only be transmitted through the transition gate line 21. In particular, for the special structure shown in FIGS. 15 and 16, since the solar cell 1 does not include the main grid line, the inter-chip interconnection bar 40 is connected to the rectangular grid line 23 in the transition current area when the solar cell 1 is connected.

In general, the width of the inter-chip interconnection bar 40 is 0.1 to 0.2 mm larger than the width of the busbar line 11. As the length of the busbar line on the solar cell 1 is reduced, the inter-chip interconnection bar 40 is on the light-receiving surface of the solar cell 1 The length of the upper part is also reduced accordingly. Therefore, the shading area of the inter-chip interconnection strip 40 is reduced, which not only reduces the material of the inter-chip interconnection strip 40, but also helps to improve the power generation efficiency of the solar cell 1.

Figures 18 and 19 show two forms in which the inter-chip interconnecting strips 40 connect the solar cell sheets 1 to form a battery string. In Fig. 18, the projection areas of two adjacent solar cell sheets 1 in the battery string do not overlap. In Figure 19, for any two adjacent solar cells 1 in the battery string, the projection area of one solar cell 1 overlaps with the projection area of the other solar cell 1, that is, the main solar cell 1 is The current area 10 is adjacent to the transition current area 20 of another solar cell 1 and connected in series by the inter-chip interconnecting bar 40. In FIG. 19, a part of the main current area 10 of the lower solar cell 1 is located on the transition current of the upper solar cell 1 Below area 20.

Please refer to FIG. 20, the two ends of N such battery strings are connected by bus bars 50 to form a parallel structure, thus forming a battery plate, N≥1, and FIG. 20 takes N=6 as an example. The solar cells 1 in the N cell strings in each battery block are also connected by L inter-string interconnecting bars 60 to form a parallel structure. L is an integer, and each cell can be connected by inter-series interconnecting bars 60. It is also possible to use inter-series interconnecting strips 60 to connect every few cells. A protection diode 70 is connected between the two inter-string interconnecting strips 60 in each battery block, and/or, a protection diode 70 is connected between the bus bar 50 and the inter-string interconnecting strip 60 of the battery block, which may Protection diodes 70 are connected between each of the inter-string interconnecting bars 60, and a protection diode 70 may be provided every several inter-string interconnecting bars 60. The protection diode 70 divides the battery string into several parts along the direction of the battery string and protects them separately. Each protection diode 70 protects the solar cell 1 between the interconnection bar 60/bus bar 50 to which it is connected. When the solar cell 1 is blocked or the circuit is disconnected, the corresponding protection diode 70 starts to work to isolate the cells controlled by the protection diode 70 without affecting the normal power generation of the remaining solar cells 1. Each protection diode 70 adopts a built-in or an external structure: the built-in structure is that the protection diode 70 is built in the battery slice layer 30, and the external structure is that the protection diode 70 is arranged outside the battery slice layer 30, and the series interconnection strip 60 And/or the bus bar 50 passes through and is connected to the protection diode 70.

The battery sheet layer 30 includes M battery plates as shown in FIG. 20. When M=1, the structure of the battery sheet layer 30 is as shown in FIG. 20, that is, the battery sheet layer 30 is composed of a single battery plate. The bus bars 50 at both ends of the plate are respectively connected to the lead wires 80, and the lead wires 80 are welded to the middle of the bus bars 50 to reduce current loss. This structure is easier to protect the circuit, can also save the cost of diodes and materials, easier to realize unmanned automatic operation, the investment of equipment cost is less, it can improve the yield of photovoltaic modules, and improve the quality of photovoltaic modules.

When M≥2, the two ends of the M battery plates are connected by the bus bar 50 to form a series structure to form a loop. Fig. 21 shows the structure of the battery layer 30 when M=2, as shown in Fig. 22 The structure diagram of the cell layer 30 when M=4. Figures 21 and 22 are only examples. The actual number of cell plates included in the cell layer 30 is not limited. You can add more cell plates by analogy to form a larger version. The conventional photovoltaic module has two versions, 60 and 72. The 60 version has 6*10 battery panels, and the 72 version has 6*12 battery panels. Figure 22 is more suitable for the 72 version.

As shown in Figure 5-14, when the solar cells 1 are arranged to form the cell layer 30, there are many ways to arrange the solar cells 1 to connect the main current areas of the adjacent solar cells 1 The transition current area of adjacent solar cells 1 can be connected to each other, and the main current area and the transition current area of adjacent solar cells 1 can be connected to each other. When the structure shown in Figure 14 is adopted, the photovoltaic When the transition current area on the solar cell 1 on the outermost side of the module is on the inner side, that is, when the transition current area is not at the edge of the photovoltaic module, this arrangement will help increase the power generation efficiency of the photovoltaic module.

In this application, the bus bar 50, the inter-chip interconnection strip 40 and the inter-series interconnection strip 60 are all made of electrical connection materials, which can be realized as photovoltaic soldering tape, conductive tape or conductive glue, etc., but the inter-chip interconnection strip 40 and The inter-string interconnection bar 60 is mainly used to draw the current of the solar cell 1, the inter-segment interconnection bar 40 mainly draws the current of the same string of cells, and the inter-string interconnection bar 60 mainly draws the current of different strings of cells to realize the inter-string current The shunt function also plays a role of physical limit fixation between strings. The bus bar 50 is mainly used to draw the current of multiple battery strings. The current carried by the interconnection bar and the bus bar are different, so the material size is also different, so different names are used to distinguish in this application.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. Within range.

Claims

A solar cell sheet, characterized in that the solar cell sheet includes a silicon wafer layer, a front silver paste layer located on the front side of the silicon wafer layer, and a back silver paste layer located on the back side of the silicon wafer layer;

The front silver paste layer includes main grid lines and fine grid lines constituting the main current region, and transition grid lines and fine grid lines constituting the transition current region, each of the transition grid lines is connected to at least one of the main grid lines respectively. Wire connection; the thin gate lines of the main current area are respectively connected to the main gate lines; the thin gate lines of the transition current area are respectively connected to the transition gate lines.
The solar cell sheet according to claim 1, wherein the width of the transition grid line decreases from an end connected to the main grid line to an end away from the main grid line.
The solar cell sheet according to claim 1, wherein the transition grid line has an irregular shape.
The solar cell sheet according to claim 1, wherein the thin grid lines in the transition current region are linear.
The solar cell sheet according to claim 1, wherein the thin grid lines in the transition current region are arc-shaped.
The solar cell sheet according to any one of claims 1 to 5, wherein the solar cell sheet is 1/2 slice or 1/3 slice or 1/4 slice or 1/5 slice or 1 /6 slice or 1/7 slice or 1/8 slice or 1/9 slice or 1/10 slice or 1/12 slice.
The solar cell sheet according to any one of claims 1 to 5, wherein the width of the transition grid line is larger than the width of the thin grid line and smaller than the width of the main grid line.
The solar cell sheet according to any one of claims 1 to 5, wherein the width of the thin grid lines in the silver paste layer on the front side is 0.01mm~0.06mm, and the width of the main grid lines is 0.3mm~ 0.8mm.
The solar cell according to any one of claims 1 to 5, characterized in that, in the transition current zone, a number of transition grid lines are connected to a part of the transition grid line except for the end, or each A number of transition gate lines are connected to positions other than the ends of the transition gate line, and the number of other transition gate lines connected to each transition gate line is the same or different.
A photovoltaic module, characterized in that the photovoltaic module comprises a front panel, a cell sheet layer, a back panel, and an adhesive film layer, and the front panel, the cell layer and the back panel are glued through the adhesive film layer. Connect as a whole

The battery sheet layer includes M battery plates, the two ends of the M battery plates are connected by bus bars to form a series structure, and each battery plate includes N battery strings, M≥1 and N≥1, the same The two ends of the N battery strings in a battery panel are connected by bus bars to form a parallel structure. Each battery string includes K solar cells, and each solar cell uses any one of claims 1-9. In the solar cell sheet, the K solar cell sheets are arranged in sequence and connected in series by inter-chip interconnecting strips to form a battery string, each of the inter-chip interconnecting strips covers the main grid lines in two adjacent solar cells but not Cover the transition gate line, K is an integer.
The photovoltaic module according to claim 10, wherein the projection areas of two adjacent solar cells in the battery string do not overlap or overlap.
The photovoltaic module according to claim 10 or 11, characterized in that, the solar cells in the N cell strings in each battery panel are also connected by L inter-string interconnecting bars to form a parallel structure, and L is An integer, a protection diode is connected between the two inter-string interconnecting bars in each battery block, and/or a protection diode is connected between the bus bar and the inter-string interconnecting bar.
The photovoltaic module according to claim 12, wherein each of the protection diodes is built in the cell layer, or arranged outside the cell layer and electrically connected to the cell layer.