Solar cells and photovoltaic modules

Abstract

The invention discloses a solar cell and a photovoltaic module, belonging to the field of photovoltaics; the front silver paste layer of the silicon wafer layer of the solar cell in the application comprises fine grid lines constituting a main current zone and main grid lines connected thereto, and transition grid lines constituting a transition current zone and fine grid lines connected thereto, each transition grid line is respectively connected to at least one main grid line, and the current in the transition current zone flows into the main grid lines in the main current zone through the transition grid lines, which reduces the length of the main grid lines, increases the light-receiving area of ​​the solar cell, can reduce the amount of silver paste used, and improves the power generation efficiency of the solar cell; the solar cells of the application are connected in series and parallel to form a battery plate, and a plurality of battery plates are constructed to form the photovoltaic module of the application, the photovoltaic module has high power generation efficiency, low material cost, and low process requirements, can realize fully automated unmanned operation, improve production efficiency, and improve the yield rate of the photovoltaic module.

Description

Technical Field

[0001] The embodiments of the present invention relate to the photovoltaic field, and in particular to a solar cell and a photovoltaic module. Background Art

[0002] As the price of traditional energy rises, the development and utilization of new energy has become the main research topic in the field of energy today. Due to the limited characteristics of solar energy, such as no pollution, no geographical restrictions, and inexhaustible, the use of solar cells to generate electricity is becoming more and more popular.

[0003] In order to reduce the power loss of the battery cell, it is necessary to print denser fine grid lines and thicker main grid lines on the battery cell. The conventional size of the entire battery cell is 156-166mm. The larger the size of the battery cell, the greater the number of fine grid lines and main grid lines required. This will greatly increase the amount of silver paste used in the battery cell and reduce the light-receiving and power generation area of ​​the battery cell. The increased silver paste in the battery cell greatly increases the cost of the battery cell, and the reduction in the light-receiving and power generation area of ​​the battery cell will reduce the overall power generation of the battery cell. How to balance the power generation efficiency and battery cost of the segmented battery cell is a major problem in the current battery cell manufacturing process.

[0004] Existing conventional photovoltaic modules use whole or half-cell cells, which are connected in series. Three diodes are used to protect the circuit. Each diode protects two strings of cells. When the cell is blocked or the circuit is damaged, the diode works to isolate the corresponding two strings of cells. The actual power generation of the photovoltaic module is only 1 / 3 of the designed one, which seriously affects the actual power generation. In order to improve the high conversion efficiency of photovoltaic modules, the hot spot of market module design is the shingled module process product without solder strips. The advantage of shingled products is that the module conversion efficiency is very high, but the biggest shortcoming of shingled products without solder strips on the surface is the hidden cracks of photovoltaic modules on the cells, especially the hidden cracks in the vertical string length direction. If the hidden cracks extend, it can cause the entire cell string to fail in the worst case, and the photovoltaic module as a whole will be scrapped. This design defect greatly limits the real large-scale use of the product, and the cost of shingling is also high. Summary of the invention

[0005] In order to solve the problems of the prior art, the embodiment of the present invention provides a solar cell and a photovoltaic module. The technical solution is as follows:

[0006] A solar cell comprises a silicon cell layer, a front silver paste layer located on the front side of the silicon cell layer, and a back silver paste layer located on the back side of the silicon cell layer;

[0007] The front silver paste layer includes main grid lines and fine grid lines constituting the main current area, and transition grid lines and fine grid lines constituting the transition current area. Each transition grid line is connected to at least one main grid line; the fine grid lines in the main current area are connected to the main grid lines; the fine grid lines in the transition current area are connected to the transition grid lines.

[0008] A further technical solution is that the width of the transition gate line decreases from the end connected to the main gate line to the end away from the main gate line.

[0009] A further technical solution is that the transition grid line is of irregular shape.

[0010] A further technical solution is that the thin gate lines in the transition current region are linear.

[0011] A further technical solution is that the thin grid lines in the transition current region are arc-shaped.

[0012] A further technical solution is that the solar cell is split into 1 / 2 slices, 1 / 3 slices, 1 / 4 slices, 1 / 5 slices, 1 / 6 slices, 1 / 7 slices, 1 / 8 slices, 1 / 9 slices, 1 / 10 slices, or 1 / 12 slices.

[0013] A further technical solution is that the width of the fine grid lines in the front silver paste layer is 0.01mm-0.06mm, the width of the main grid lines is 0.3mm-0.8mm, and the width of the transition grid lines is greater than the width of the fine grid lines and less than the width of the main grid lines.

[0014] A photovoltaic module, comprising a front plate, a battery layer, a back plate and an adhesive film layer, wherein the front plate, the battery layer and the back plate are bonded together as a whole through the adhesive film layer;

[0015] The battery cell layer includes M battery plates, the two ends of the M battery plates are connected by a bus bar to form a series structure, each battery plate includes N battery strings, M≥1 and N≥1, the two ends of the N battery strings in the same battery plate are connected by a bus bar to form a parallel structure, each battery string includes K solar cells, each solar cell adopts any one of claims 1-7 solar cells, K solar cells are arranged in sequence and connected in series through inter-cell interconnection strips to form a battery string, each inter-cell interconnection strip covers the main grid lines in two adjacent solar cells but does not cover the transition grid lines, and K is an integer.

[0016] A further technical solution is that the solar cells in the N battery strings in each battery block are connected to each other through L inter-string interconnection bars to form a parallel structure, where L is an integer, and a protection diode is connected between two inter-string interconnection bars in each battery block, and / or a protection diode is connected between the bus bar and the inter-string interconnection bar.

[0017] A further technical solution is that each protection diode is built into the battery cell layer, or is arranged outside the battery cell layer and electrically connected to the battery cell layer.

[0018] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0019] The present application discloses a solar cell and a photovoltaic module based on the solar cell. A main current region and a transition current region are arranged on the front silver paste layer of the solar cell. The main current region includes a fine grid line and a main grid line, and the transition current region includes a transition grid line and a fine grid line. There is no main grid line in the transition current region. The current emitted by the transition current region flows into the main current region, and the current is relatively small. The current in the transition current region flows into the main grid line of the main current region through the transition grid line, which reduces the length of the main grid line and increases the light-receiving area of ​​the solar cell. The amount of silver paste used can be reduced and the power generation efficiency of the solar cell can be improved.

[0020] Multiple solar cells are connected in series through inter-cell interconnection strips to form a cell string, and the cell strings are connected in parallel to form an independent cell plate. A single cell plate or a structure of multiple cell plates connected in series can be used to form a cell layer to form a photovoltaic module, which can improve the power generation efficiency of the photovoltaic module and reduce the material cost of the photovoltaic module. It has low requirements on the photovoltaic module process and can achieve fully automated unmanned operation, thereby improving production efficiency and the yield of photovoltaic modules.

[0021] Multiple inter-string interconnection bars can also be set in each independent battery plate, and protection diodes can be connected between the inter-string interconnection bars and between the inter-string interconnection bars and the bus bars. Each diode controls a diode segmentation area, which can isolate the diode segmentation area 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 is a front schematic diagram of a solar cell according to an exemplary embodiment;

[0024] Figure 2 is a schematic diagram showing a connection between a main grid line and a transition grid line according to an exemplary embodiment;

[0025] Figure 3 is a schematic diagram showing a connection of a transition gate line according to an exemplary embodiment;

[0026] Figure 4 is a schematic diagram showing another connection of transition gate lines according to an exemplary embodiment;

[0027] Figure 5 is a partial schematic diagram of the front side of a photovoltaic module according to an exemplary embodiment;

[0028] Figure 6 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0029] Figure 7 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0030] Figure 8 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0031] Fig. 9 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0032] Fig.10 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0033] Fig.11 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0034] Fig.12 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0035] Fig.13 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0036] Fig.14 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0037] Fig.15 is a partial schematic diagram of the front side of another photovoltaic assembly according to an exemplary embodiment;

[0038] Fig.16 yes Fig.15 A partial enlarged structural diagram of the structure shown;

[0039] Fig.17 is a partial side schematic diagram of a photovoltaic assembly according to an exemplary embodiment;

[0040] Fig.18 is a partial side schematic diagram of a battery string according to an exemplary embodiment;

[0041] Fig.19 is a partial side schematic diagram of another battery string according to an exemplary embodiment.

[0042] Fig. 20 The diagram is a structural diagram of a photovoltaic module according to an exemplary embodiment.

[0043] Fig.21 is a structural diagram of another photovoltaic assembly according to an exemplary embodiment.

[0044] Fig. 22 is a structural diagram of another photovoltaic assembly according to an exemplary embodiment. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0046] An embodiment of the present invention provides a solar cell, which includes a silicon cell layer, a front silver paste layer located on the front side of the silicon cell layer, and a back silver paste layer located on the back side of the silicon cell layer.

[0047] like Figure 1 As shown, the front silver paste layer includes main grid lines 11 and fine grid lines 12 constituting the main current region 10 , and transition grid lines 21 and fine grid lines 22 constituting the transition current region 20 .

[0048] Each transition gate line 21 is connected to at least one main gate line 11, and one end of each main gate line 11 is connected to at least one transition gate line 21. The end of the main gate line 11 close to the transition current region 20 is connected to the transition gate line 21, and the end of the main gate line 11 away from the transition current region 10 is not connected to the transition gate line 21.

[0049] For example, one end of each main grid line 11 is connected to five transition grid lines 21. Figure 1 , Figure 5 , Figure 6 , Figure 7 As shown; one end of each main grid line 11 is connected to three transition grid lines 21, such as Figure 8 , Fig.10 As shown; one end of each main grid line 11 is connected to two transition grid lines 21, such as Fig. 9 The drawings in this application are only for illustrative purposes and do not limit the number of transition grid lines in a solar cell.

[0050] The fine gate lines 12 of the main current region 10 are respectively connected to the main gate lines 11. The fine gate lines 22 of the transition current region 20 are respectively connected to the transition gate lines 21, wherein one side of the transition gate line 21 adjacent to the main current region 10 is connected to the fine gate line 22 in the transition current region 20, and both sides of the transition gate line not adjacent to the current region 10 are connected to the fine gate line 22 in the transition current region 20. The angle between the fine gate line 22 of the transition current region 20 and the transition gate line 21 can be determined according to actual needs, and the embodiment of the present invention does not limit this.

[0051] Each fine grid line in the main current region 10 and the transition current region 20 is used to collect the current generated by the solar cell after being exposed to light. Each fine grid line 22 in the transition current region 20 is used to transfer the collected current to the connected transition grid line 21. Each transition grid line 21 is used to collect the current on the fine grid line 22 connected to the transition grid line 21 and transfer the collected current to the connected main grid line 11. Each fine grid line 12 in the main current region 10 is used to transfer the collected current to the connected main grid line 11. The main grid line 11 is used to collect the current of each fine grid line 12 and each transition grid line 21 connected thereto.

[0052] 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. Figure 2 As shown; in this case, the transition gate line 21 is a straight line. In another case, the transition gate line 21 is an irregular shape, such as a curve or a broken line. All transition gate lines 21 in the transition current region 20 have the same shape, or some transition gate lines 21 have the same shape, some transition gate lines 21 have different shapes, or all transition gate lines 21 have different shapes; this is not limited in this embodiment.

[0053] In the present application, the width of each fine gate line in the main current region 10 and the transition current region 20 is 0.01mm-0.06mm, and the width of the main gate line 11 is 0.3mm-0.8mm; the width of the transition gate line 21 is greater than the width of the fine gate line and less than the width of the main gate line 11.

[0054] Optionally, in the transition current region 20, a plurality of transition gate lines 21 are connected to the transition gate line 21 except for the end portion, and one transition gate line 21 may be connected, such as Figure 3 As shown, at least two transition gate lines 21 may be connected. Figure 4 In actual implementation, some of the transition gate lines 21 in the transition current region 20 are 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 is not connected to other transition gate lines, and the number of other transition gate lines connected to each transition gate line 21 can be the same or different.

[0055] In one case, the thin gate line 22 in the transition current region 20 is linear, such as Figure 5 In another case, the thin gate line 22 in the transition current region 20 is arc-shaped, such as Figure 6 .

[0056] The solar cell provided in the embodiment of the present invention can also be cut into 1 / 2 slices, 1 / 3 slices, 1 / 4 slices, 1 / 5 slices, 1 / 6 slices, 1 / 7 slices, 1 / 8 slices, 1 / 9 slices, 1 / 10 slices or 1 / 12 slices according to the demand for the cell.

[0057] for example: Figure 5 , Figure 6 , Fig.10 The solar cells used in the experiment are 1 / 3 slices; Figure 7 , Figure 8 , Fig. 9 The solar cell used in the experiment is 1 / 2 sliced; Fig.11 The solar cell used in the experiment is 1 / 4 sliced; Fig.12 , Fig.13 , Fig.14 The solar cells used in the experiment are 1 / 5 slices.

[0058] It should be noted that, on each solar cell, the number of main grid lines may be 3 to 12, or may be other numbers, which is not limited in the embodiment of the present invention.

[0059] Figures 5 to 14 The pattern formed by the transition current region and the main current region shown in FIG. 1 is only an exemplary description, and the embodiment of the present invention is not limited to this.

[0060] In actual use, the solar cell of the present application can adopt a more special structure, please refer to Fig.15 The solar cell shown in the figure takes the solar cell as a 1 / 6 slice as an example. Fig.16 It is a partial enlarged schematic diagram of Figure 15. 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 fine grid lines 12 of the main current region 10 can be omitted. The fine grid lines of the transition current region 20 are respectively connected to the transition grid lines 21. The transition current region 20 also includes rectangular grid lines 23, and the transition grid lines 21 are respectively connected to the rectangular grid lines 23. This structure can further reduce the amount of silver paste used.

[0061] The present invention also provides a photovoltaic module based on the above solar cell. Fig.17The photovoltaic module includes a front plate 31, a back plate 32, a battery layer 30 and a film layer 33. The front plate 31, the battery layer 30 and the back plate 32 are bonded together as a whole by the 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 transparent materials, and the material of the back plate 32 can be glass or polymer. The film layer 33 is filled on both sides of the battery layer 30. The film layer 33 is made of EVA film, POE film, PVB film or silica gel, etc., which is used to wrap the battery layer 30 and bond the front plate 31 and the back plate 32 into a whole.

[0062] The 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 through inter-cell interconnection bars 40 to form a cell string, K is an integer, and the two ends of each inter-cell interconnection bar 40 are respectively connected to two adjacent solar cells 1, such as Fig.18 and 19 As shown, one end of the inter-chip interconnection bar 40 is connected to the main grid line 11 on the light-receiving surface of a solar cell 1, that is, the inter-chip interconnection bar passes through the main current area 10 on the light-receiving surface of the solar cell 1 and does not pass through the transition current area 20, and the other end of the inter-chip interconnection bar 40 is connected to the main grid line 11 on the backlight surface of the adjacent solar cell 1. Since 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 out, 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 current in the transition current area of ​​the solar cell 1 can only be transmitted through the transition grid line 21. In particular, for Fig.15 and 16 In this special structure, since the solar cell 1 does not include a main grid line, the inter-chip interconnection bar 40 is connected to the rectangular grid line 23 in the transition current region when connecting the solar cell 1 .

[0063] Generally, the width of the inter-chip interconnection strip 40 is 0.1 to 0.2 mm larger than the width of the main grid line 11. As the length of the main grid line on the solar cell 1 is reduced, the length of the inter-chip interconnection strip 40 on the light-receiving surface of the solar cell 1 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.

[0064] Fig.18 and 19 Two forms of connecting solar cells 1 to form a battery string are shown. Fig.18In FIG. 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 current region 10 of one solar cell 1 is adjacent to the transition current region 20 of the other solar cell 1 and they are connected in series through the inter-cell interconnection strip 40. Fig.19 A portion of the main current region 10 of the lower middle solar cell 1 is located below the transition current region 20 of the upper solar cell 1 .

[0065] Please refer to Fig. 20 The two ends of N such battery strings are connected via busbars 50 to form a parallel structure, thereby forming a battery plate, N ≥ 1, Fig. 20 Take N=6 as an example. The solar cells 1 in the N battery strings in each battery block are also connected by L inter-string interconnection bars 60 to form a parallel structure, where L is an integer. The inter-string interconnection bar 60 can be used to connect each battery cell, or every few battery cells can be connected by the inter-string interconnection bar 60. A protection diode 70 is connected between two inter-string interconnection bars 60 in each battery block, and / or a protection diode 70 is connected between the bus bar 50 of the battery block and the inter-string interconnection bar 60. A protection diode 70 can be connected between every two inter-string interconnection bars 60, or a protection diode 70 can be set every few inter-string interconnection 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 inter-string 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, and the battery cell controlled by the protection diode 70 is separated without affecting the normal power generation of the remaining solar cells 1. Each protection diode 70 is arranged in an internal or external structure: the internal structure is that the protection diode 70 is built into the battery cell layer 30, and the external structure is that the protection diode 70 is arranged outside the battery cell layer 30, and the inter-string interconnection bar 60 and / or the bus bar 50 passes through and is connected to the protection diode 70.

[0066] The battery sheet layer 30 includes M cells such as Fig. 20 When M=1, the structure of the battery layer 30 is as shown in FIG. Fig. 20 As shown, the cell layer 30 is composed of a single cell plate, and the busbars 50 at both ends of the cell plate are respectively connected to the lead wires 80, and the lead wires 80 are welded to the middle of the busbars 50 to reduce the current loss. This structure is easier to protect the circuit, saves the cost of diodes and materials, is easier to realize unmanned automated operation, has less equipment cost, and can improve the yield rate of photovoltaic modules and improve the quality of photovoltaic modules.

[0067] When M≥2, the two ends of the M battery panels are connected through the bus bar 50 to form a series structure to form a loop, such as Fig.21 The structure diagram of the battery layer 30 when M=2 is shown. Fig. 22 The structure diagram of the battery layer 30 when M=4 is shown. Fig.21 and 22 This is just an example. The number of battery panels included in the actual battery layer 30 is unlimited. More battery panels can be added in turn to form a larger version. Conventional photovoltaic modules have two versions, 60 and 72. The 60 version has 6*10 battery panels, while the 72 version has 6*12 battery panels. Fig. 22 This type is more suitable for 72 version.

[0068] like Figure 5-14 As shown, when the solar cells 1 are arranged to form a cell layer 30, there are many ways to arrange the solar cells 1. The main current regions of adjacent solar cells 1 can be arranged in contact with each other, the transition current regions of adjacent solar cells 1 can be arranged in contact with each other, or the main current regions and transition current regions of adjacent solar cells 1 can be arranged in contact with each other. Fig.14 In this structure, the transition current zone on the outermost solar cell 1 of the photovoltaic module is on the inner side, that is, the transition current zone is not at the edge of the photovoltaic module. This arrangement is beneficial to increasing the power generation efficiency of the photovoltaic module.

[0069] In the present application, the bus bar 50, the inter-chip interconnection bar 40 and the inter-string interconnection bar 60 are all made of electrical connection materials, which can be realized as photovoltaic welding strips, conductive tapes or conductive adhesives, etc., but the inter-chip interconnection bar 40 and the inter-string interconnection bar 60 are mainly used to lead out the current of the solar cell 1. The inter-chip interconnection bar 40 mainly leads out the current of the cells in the same string, and the inter-string interconnection bar 60 mainly leads out the current of the cells in different strings, realizing the current shunting function between strings, and also playing a role of physical limit fixing between strings. The bus bar 50 is mainly used to lead out the current of multiple strings of cells. The interconnection bar and the bus bar carry different currents, so the material size is also different, so different names are used to distinguish them in the present application.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A solar cell, characterized in that: The solar cell comprises 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 area, and transition grid lines and fine grid lines constituting the transition current area, each of the transition grid lines is respectively connected to at least one of the main grid lines, one end of each of the main grid lines is connected to at least one of the transition grid lines, the end of the main grid line close to the transition current area is connected to the transition grid line, and the end of the main grid line far from the transition current area is not connected to the transition grid line; the fine grid lines in the main current area are respectively connected to the main grid lines; the fine grid lines in the transition current area are respectively connected to the transition grid lines, and the fine grid lines in the transition current area are respectively connected to the transition grid lines. One side of an adjacent transition gate line is connected to the fine gate line in the transition current region, and both sides of the transition gate line not adjacent to the main current region are connected to the fine gate line in the transition current region; the width of the transition gate line is greater than the width of the fine gate line and less than the width of the main gate line, and the width of the transition gate line decreases from the end connected to the main gate line to the end away from the main gate line, and the transition gate line is an irregular shape; the width of the fine gate line in the front silver paste layer is 0.01mm~0.06mm, and the width of the main gate line is 0.3mm~0.8mm.

2. The solar cell according to claim 1, characterized in that: The thin gate lines in the transition current region are linear.

3. The solar cell according to claim 1, characterized in that: The thin gate lines in the transition current region are arc-shaped.

4. The solar cell according to any one of claims 1 to 3, characterized in that: The solar cell is split into 1 / 2 slices, 1 / 3 slices, 1 / 4 slices, 1 / 5 slices, 1 / 6 slices, 1 / 7 slices, 1 / 8 slices, 1 / 9 slices, 1 / 10 slices, or 1 / 12 slices.

5. A photovoltaic module, characterized in that: The photovoltaic module comprises a front plate, a battery layer, a back plate and an adhesive film layer, wherein the front plate, the battery layer and the back plate are bonded together as a whole through the adhesive film layer; The battery cell layer includes M battery panels, the two ends of the M battery panels are connected by a bus bar to form a series structure, each of the battery panels includes N battery strings, M≥1 and N≥1, the two ends of the N battery strings in the same battery panel are connected by a bus bar to form a parallel structure, each of the battery strings includes K solar cells, each of the solar cells adopts the solar cell as described in any one of claims 1-4, the K solar cells are arranged in sequence and connected in series through inter-cell interconnection strips to form a battery string, each of the inter-cell interconnection strips covers the main grid lines in two adjacent solar cells but does not cover the transition grid lines, and K is an integer.

6. The photovoltaic module according to claim 5, characterized in that: The solar cells in the N battery strings in each of the battery panels are also connected via L inter-string interconnection bars to form a parallel structure, where L is an integer. A protection diode is connected between two of the inter-string interconnection bars in each of the battery panels, and / or a protection diode is connected between the bus bar and the inter-string interconnection bar.

7. The photovoltaic module according to claim 6, characterized in that: Each of the protection diodes is built into the battery cell layer, or is arranged outside the battery cell layer and electrically connected to the battery cell layer.

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