A solar cell and photovoltaic module

Abstract

The present application discloses a solar cell and a photovoltaic module, belonging to the field of photovoltaic technology. The solar cell comprises a cell body, the cell body comprises a substrate, a doping region formed on the substrate, and a passivation layer covering the doping region; a first graphic region, the first graphic region is arranged on the passivation layer, and the first graphic region has a plurality of first fine grids extending along a first direction and arranged at intervals along a second direction, each first fine grid comprises a plurality of first connecting segments arranged at intervals along the first direction and a second connecting segment connected between two adjacent first connecting segments, and the second direction intersects with the first direction; along the second direction, a plurality of second connecting segments are arranged at intervals, and at least one first connecting segment is arranged between two adjacent second connecting segments, the first connecting segment burns through the passivation layer and is electrically connected to the doping region, and the second connecting segment does not burn through the passivation layer.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a solar cell and a photovoltaic module. Background Art

[0002] A solar cell has a front side facing the sunlight and a back side facing away from the sunlight. Back-contact solar cells have the positive and negative grid lines of the cell placed on the back side of the cell to prevent the positive and negative grid lines from blocking the front side of the solar cell, thereby improving the photoelectric conversion efficiency of the solar cell.

[0003] like Figure 1 As shown, in the prior art, the back of the back-contact solar cell is provided with positive fine grids 80 and negative fine grids 81 extending in the first direction and arranged alternately in the second direction, so as to collect the current generated by the cell through the positive fine grids 80 and the negative fine grids 81. The back of the cell is also provided with positive main grids 82 and negative main grids 83 extending in the second direction and arranged at intervals in the first direction, and the positive main grids 82 and the negative main grids 83 both include welding points 84 arranged alternately in the second direction and connecting lines 85 connected to the welding points 84. The welding strip extends in the second direction and is connected to the welding point 84, and the current is transmitted to the welding strip through the welding point 84, so as to collect and transmit the current through the welding strip.

[0004] Taking the positive main grid 82 as an example, in the area where the welding point 84 of the positive main grid 82 is located, the positive fine grid 80 is connected to the welding point 84 of the positive main grid 82, and the current collected by the positive fine grid 80 can be collected through the welding point 84 of the positive main grid 82, and the negative fine grid 81 is spaced apart from the welding point 84 of the positive main grid 82 to avoid short circuits in the battery cell. In the area where the connecting line 85 of the positive main grid 82 is located, the positive fine grid 80 is connected to the connecting line 85 of the positive main grid 82, and the current collected by the positive fine grid 80 is transmitted to the welding point 84 of the positive main grid 82 through the connecting line 85 of the positive main grid 82, and then the current is transmitted to the corresponding welding strip through the welding point 84 of the positive main grid 82, so as to collect and transmit the current. The connecting line 85 of the negative fine grid 81 and the positive main grid 82 is spaced apart to avoid short circuits in the battery cell. It should be noted that the principle of the negative electrode main grid 83 is the same as that of the positive electrode main grid 82 and will not be described in detail.

[0005] However, the above arrangement results in a longer current transmission distance and greater internal losses, thereby affecting the photoelectric conversion efficiency of the battery cell. Summary of the invention

[0006] The present application discloses a solar cell and a photovoltaic module to solve or at least partially solve the problems existing in the prior art, that is, the current transmission distance is long, the internal loss is large, and the photoelectric conversion efficiency of the cell is affected.

[0007] In order to solve the above technical problems, this application is implemented as follows:

[0008] In a first aspect, the present application discloses a solar cell, the solar cell comprising: a cell body, the cell body comprising a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; a first graphic region, the first graphic region being arranged on the passivation layer, the first graphic region having a plurality of first fine grids extending along a first direction and arranged at intervals along a second direction, each of the first fine grids comprising a plurality of first connecting segments arranged at intervals along the first direction and a second connecting segment connected between two adjacent first connecting segments, the second direction intersecting with the first direction; along the second direction, a plurality of the second connecting segments are arranged at intervals, at least one first connecting segment is arranged between two adjacent second connecting segments, wherein the first connecting segment burns through the passivation layer and is electrically connected to the doped region, and the second connecting segment does not burn through the passivation layer.

[0009] Optionally, along the first direction, the length of each first connecting segment is greater than the length of each second connecting segment; and / or, along the second direction, the width of each second connecting segment is greater than the width of each first connecting segment.

[0010] Optionally, along the second direction, the polarity of the second connecting segment is opposite to the polarity of the adjacent first connecting segment.

[0011] Optionally, the solar cell further includes: a second graphic region, the second graphic region is arranged on the passivation layer and is adjacent to the first graphic region along the second direction; the second graphic region has a plurality of second fine grids extending along the first direction and arranged at intervals along the second direction, the second graphic region also has a collecting section, the collecting section extends along the second direction; wherein a portion of the second fine grids is connected to the collecting section.

[0012] Optionally, the collecting section includes a collecting point and an end line connected to the collecting point, and the end line is arranged at a position of the second graphic area away from the first graphic area; the plurality of second fine grids include a plurality of first sub-grids and a plurality of second sub-grids alternately arranged along the second direction, wherein the plurality of first sub-grids are connected to the collecting point or the end line, and there are gaps between the plurality of second sub-grids and the collecting point or the end line.

[0013] Optionally, the plurality of second fine gates include a plurality of first sub-gates and a plurality of second sub-gates alternately arranged along the second direction, the plurality of first sub-gates are connected to the collecting segment, and there are gaps between the plurality of second sub-gates and the collecting segment; a first gap, a second gap and a third gap arranged along the first direction are provided between the second sub-gates located on both sides of the collecting segment, and along the second direction, the first gap, the second gap and the third gap gradually move away from the first graphic area; along the first direction, the width of the first gap is d1, the width of the second gap is d2, and the width of the third gap is d3, wherein d1, d2 and d3 satisfy d1>d2>d3>0; or, satisfy d1>d2=d3>0.

[0014] Optionally, the collection segment includes a collection point and an end line connected to the collection point, wherein the end line is connected to a side of the collection point away from the first graphic area; the collection point passes through the first gap, and the end line passes through the second gap and the third gap.

[0015] Optionally, the solar cell further comprises an insulating layer, wherein the insulating layer comprises a plurality of insulating strips extending along the first direction and arranged at intervals along the second direction, each of the insulating strips covering a portion of a first connecting segment between two adjacent second connecting segments.

[0016] Optionally, along the second direction, a distance between a side of the second connecting section close to an adjacent insulating strip and a side of an adjacent insulating strip close to the second connecting section is d4, and d4≥40 μm.

[0017] Optionally, on the plane where the battery cell body is located, the first connecting segment has a first projection, the second connecting segment has a second projection, and the first projection at least partially falls within the second projection; along the second direction, the distance between two adjacent first fine grids with the same polarity is P1, and along the first direction, the disconnected distance between two first connecting segments connected to the same second connecting segment is P2, satisfying P2≤P1.

[0018] Optionally, along the first direction, the length of the second connecting segment is P3, satisfying P2<P3; and / or, P2≥0mm, and 0.5mm≤P1≤1.5mm.

[0019] In a second aspect, the present application further discloses a photovoltaic module, which includes a solar cell, wherein the solar cell includes a cell body, the cell body includes a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; a first graphic region, wherein the first graphic region is arranged on the first surface of the cell body, wherein the first graphic region has a plurality of first fine grids extending along a first direction and arranged at intervals along a second direction, each of the first fine grids includes a plurality of first connecting segments arranged at intervals along the first direction and a second connecting segment connected between two adjacent first connecting segments, and the second direction intersects with the first direction; along the second direction, a plurality of second connecting segments are arranged at intervals, and at least one first connecting segment is arranged between two adjacent second connecting segments, wherein the first connecting segment burns through the passivation layer and is electrically connected to the doped region, and the second connecting segment does not burn through the passivation layer; an electrical connector, wherein the electrical connector extends along the second direction, the electrical connector is electrically connected to the second connecting segment, and the electrical connector is insulated from the first connecting segment.

[0020] Optionally, the electrical connector is insulated from the first connecting section by an insulating layer; the insulating layer includes a plurality of insulating strips arranged at intervals along the second direction, and each of the insulating strips is arranged between one of the first connecting sections and the electrical connector.

[0021] Optionally, the photovoltaic component also includes a first bonding layer, wherein the first bonding layer includes a plurality of first bonding portions arranged at intervals along the second direction, each first bonding portion is arranged between a second connecting section and the electrical connector; and / or, along the thickness direction of the photovoltaic component, the height of the first bonding portion is greater than the height of the insulating strip.

[0022] Optionally, along the first direction, the length of the insulating strip is greater than the length of the first joining portion; and / or the length of the insulating strip and the length of the first joining portion are both greater than the width of the electrical connector.

[0023] Optionally, along the second direction, a height of a middle region of the insulating strip is higher than a height of regions on both sides of the insulating strip.

[0024] Optionally, the photovoltaic component also includes a second bonding layer, wherein the second bonding layer includes a plurality of second bonding portions extending along the first direction and arranged at intervals along the second direction, each second bonding portion being arranged between one of the insulating strips and the electrical connector; and / or each second bonding portion being arranged between two adjacent first bonding portions along the second direction.

[0025] Optionally, the solar cell further includes: a second graphic area, the second graphic area is arranged on the first surface of the cell body, and is spaced apart from the first graphic area along the second direction, the second graphic area has a collecting section, and the end of the electrical connector and the projection of the collecting section on the cell body have an overlapping area.

[0026] Optionally, along the second direction, a ratio of a length of the overlapping region to a length of the collecting section is greater than or equal to 0.1 and less than or equal to 0.5.

[0027] The present application discloses a solar cell and a photovoltaic module, wherein the solar cell comprises a cell body, the cell body comprises a substrate, a doping region formed on the substrate and a passivation layer covering the doping region; a first graphic region, the first graphic region is arranged on the passivation layer, the first graphic region has a plurality of first fine grids extending along a first direction and arranged at intervals along a second direction, each first fine grid comprises a plurality of first connecting segments arranged at intervals along the first direction and a second connecting segment connected between two adjacent first connecting segments, the second direction intersects with the first direction; along the second direction, a plurality of second connecting segments are arranged at intervals, at least one first connecting segment is arranged between two adjacent second connecting segments, the first connecting segment burns through the passivation layer and is electrically connected to the doping region, and the second connecting segment does not burn through the passivation layer.

[0028] The above arrangement can collect the current generated by the solar cell body through the first connecting segment, and the second connecting segment can directly collect the current collected by the first connecting segment connected to the second connecting segment, thereby reducing the transmission distance of the current, reducing the internal loss of the solar cell, and improving the photoelectric conversion efficiency of the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram showing a local structure of a solar cell in the prior art;

[0030] Figure 2 A top view of a solar cell according to an embodiment of the present application is shown;

[0031] Figure 3 A top view showing the first graphic area in an embodiment of the present application;

[0032] Figure 4 A partial top view showing the first graphic area in an embodiment of the present application;

[0033] Figure 5 A top view showing the second graphic area in an embodiment of the present application;

[0034] Figure 6A top view of the photovoltaic assembly in the first graphic area in an embodiment of the present application is shown;

[0035] Figure 7 A cross-sectional view showing the photovoltaic assembly in the first graphic area in an embodiment of the present application;

[0036] Figure 8 A partial top view of the photovoltaic assembly in the first graphic area in an embodiment of the present application is shown;

[0037] Fig. 9 express Figure 8 A cross-sectional view of the photovoltaic module along the C1-C2 direction.

[0038] Reference numerals:

[0039] 10: Battery cell body;

[0040] 20: first graphic area; 21: first fine grid; 211: first connecting segment; 212: second connecting segment;

[0041] 30: second graphic area; 31: second fine grid; 311: first sub-grid; 312: second sub-grid; 32: collection segment; 321: collection point; 322: terminal line;

[0042] 40: insulation layer; 41: insulation strip;

[0043] 50: electrical connector;

[0044] 60: first bonding layer; 61: first bonding portion;

[0045] 70: second bonding layer;

[0046] A: first direction; B: second direction;

[0047] 80: positive electrode fine grid; 81: negative electrode fine grid; 82: positive electrode main grid; 83: negative electrode main grid; 84: welding point; 85: connecting line. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0049] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0050] Reference Figure 2 , showing a top view of the solar cell described in the embodiment of the present application; referring to Figure 3 , showing a top view of the first graphic area in an embodiment of the present application; referring to Figure 4 , showing a partial top view of the first graphic area in an embodiment of the present application; referring to Figure 5 , showing a top view of the second graphic area in an embodiment of the present application.

[0051] like Figures 2 to 5 As shown, an embodiment of the present application discloses a solar cell, which includes: a cell body 10, the cell body 10 includes a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; a first graphic region 20, the first graphic region 20 is arranged on the passivation layer, and the first graphic region 20 has a plurality of first fine grids 21 extending along a first direction A and arranged at intervals along a second direction B, each of the first fine grids 21 includes a plurality of first connecting segments 211 arranged at intervals along the first direction A and a second connecting segment 212 connected between two adjacent first connecting segments 211, and the second direction B intersects with the first direction A; along the second direction B, a plurality of second connecting segments 212 are arranged at intervals, and at least one first connecting segment 211 is arranged between two adjacent second connecting segments 212, wherein the first connecting segment 211 burns through the passivation layer and is electrically connected to the doped region, and the second connecting segment 212 does not burn through the passivation layer.

[0052] like Figures 2 to 5 As shown, an embodiment of the present application discloses a solar cell, which includes a cell body 10 and a first graphic area 20 arranged on a passivation layer. Among them, the cell body 10 is the core component of the solar cell, which can convert solar energy into electrical energy. The cell body 10 has a light-receiving surface facing the sunlight, that is, the front side. The cell body 10 also has a backlight surface facing away from the sunlight, that is, the back side. The first graphic area 20 in the embodiment of the present application can be arranged on the front side of the cell body 10, and can also be arranged on the back side of the cell body 10. This application does not make specific restrictions. The following will take the example that the first graphic area 20 is arranged on the back side of the cell body 10, that is, the solar cell is a back-contact solar cell.

[0053] It should be noted that the cell body 10 in the embodiment of the present application includes a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region. The first graphic region 20 is disposed on the passivation layer, and the current generated at the corresponding position of the cell body 10 is collected and aggregated through the first graphic region 20.

[0054] like Figures 2 to 5 As shown, in the embodiment of the present application, the first graphic area 20 is arranged on the back of the cell body 10, which can prevent the front of the cell body 10 from being blocked and affecting the photoelectric conversion efficiency of the cell body 10. The first graphic area 20 has a plurality of first fine grids 21 extending along the first direction A and arranged at intervals along the second direction B, so as to collect and aggregate the current generated by the cell body 10 through the first fine grids 21. The first graphic area 20 is the area occupied by the plurality of first fine grids 21 on the back of the cell body 10.

[0055] It should be noted that the battery cell body 10 in the embodiment of the present application can be a rectangular structure, a square structure, or a quasi-rectangular structure. Among them, the quasi-rectangular structure refers to a rectangular structure battery cell with a rounded chamfer or a square chamfer, and the rounded chamfer or the square chamfer is directly connected to a side of the battery cell body 10. Of course, the battery cell body 10 can also be other shapes. In the embodiment of the present application, there are no excessive restrictions on the specific structure of the battery cell body 10. The following will take the battery cell body 10 as a rectangular structure as an example for relevant description.

[0056] It should be noted that in the embodiment of the present application, if the first direction A is the length direction of the battery cell body 10, the second direction B is the width direction of the battery cell body 10. If the first direction A is the width direction of the battery cell body 10, the second direction B is the length direction of the battery cell body 10. This application does not make any specific restrictions on this.

[0057] like Figures 2 to 5 As shown, each first fine grid 21 includes a plurality of first connection segments 211 spaced apart along a first direction A and a second connection segment 212 connected between two adjacent first connection segments 211. Each first connection segment 211 and each second connection segment 212 are in a strip-shaped structure extending along the first direction A. The first connection segment 211 burns through the passivation layer and is electrically connected to the doping region, so that the current generated by the cell body 10 can be collected. The second connection segment 212 located between two adjacent first connection segments 211 does not burn through the passivation layer, and the current collected by the first connection segment 211 is directly collected through the second connection segment 212, so as to reduce the transmission distance of the current, reduce the internal loss of the solar cell, and improve the photoelectric conversion efficiency of the solar cell.

[0058] Furthermore, in the photovoltaic module, the second connection segment 212 is connected to the electrical connector 50 so as to transmit the current collected by the second connection segment 212 to the external circuit through the electrical connector 50. However, welding is required between the second connection segment 212 and the electrical connector 50. If the second connection segment 212 can burn through the passivation layer and be electrically connected to the doped region, the welding can easily affect the doped region, causing thermal damage and reducing the current collection efficiency of the photovoltaic module.

[0059] like Figures 2 to 5 As shown, along the second direction B, a plurality of second connection segments 212 are arranged at intervals, and a first connection segment 211 is provided between two adjacent second connection segments 212. It can be understood that along the second direction B, the plurality of second connection segments 212 arranged at intervals are first fine grids 21 of the same polarity, and the first connection segment 211 located between two adjacent second connection segments 212 has a polarity opposite to that of the adjacent second connection segments 212. Exemplarily, along the second direction B, when the plurality of second connection segments 212 arranged at intervals are positive first fine grids 21, the first connection segment 211 located between two adjacent second connection segments 212 is a negative first fine grid 21. Along the second direction B, when the plurality of second connection segments 212 arranged at intervals are negative first fine grids 21, the first connection segment 211 located between two adjacent second connection segments 212 is a positive first fine grid 21.

[0060] In the embodiment of the present application, multiple second connecting segments 212 are arranged at intervals along the second direction B, and a first connecting segment 211 is provided between two adjacent second connecting segments 212, so that the electrical connector 50 can be extended along the second direction B and connected to multiple second connecting segments 212 with the same polarity, thereby collecting and transmitting the current generated by the battery cell body 10.

[0061] It should be noted that the solar cell disclosed in the embodiment of the present application does not have a main grid on its surface, that is, the solar cell disclosed in the embodiment of the present application is a solar cell without a main grid. It can be understood that in the embodiment of the present application, the electrical connector 50 is directly connected to the second connecting section 212 of the first fine grid 21 to collect and transmit the current collected by the first fine grid 21.

[0062] The solar cell disclosed in the embodiment of the present application can collect the current generated by the cell body 10 through the first connecting segment 211, and the second connecting segment 212 can directly collect the current collected by the first connecting segment 211 connected to the second connecting segment 212. This can reduce the transmission distance of the current, reduce the internal loss of the solar cell, and improve the photoelectric conversion efficiency of the solar cell.

[0063] Alternatively, if Figures 2 to 5As shown, along the first direction A, the length of each first connecting segment 211 is greater than the length of each second connecting segment 212 ; and / or, along the second direction B, the width of each second connecting segment 212 is greater than the width of each first connecting segment 211 .

[0064] like Figures 2 to 5 As shown, in the embodiment of the present application, along the first direction A, the length of each first connection segment 211 is set to be greater than the length of each second connection segment 212. The first connection segment 211 is longer than the second connection segment 212, so that the current generated by the cell body 10 can be better collected, and the photoelectric conversion efficiency of the solar cell can be improved.

[0065] like Figures 2 to 5 As shown, in the embodiment of the present application, along the second direction B, the width of each second connection segment 212 is set to be greater than the width of each first connection segment 211. This makes the connection between the second connection segment 212 and the electrical connector 50 more reliable, so that the current collected by the second connection segment 212 can be transmitted to the external circuit through the electrical connector 50.

[0066] Optionally, along the second direction B, the polarity of the second connecting segment 212 is opposite to the polarity of the adjacent first connecting segment 211 .

[0067] like Figures 2 to 5 As shown, along the second direction B, a plurality of second connection segments 212 are arranged at intervals, and a first connection segment 211 is arranged between two adjacent second connection segments 212. Along the second direction B, when the polarity of the second connection segment 212 is positive, the first connection segment 211 adjacent to the second connection segment 212 is negative. When the polarity of the second connection segment 212 is negative, the first connection segment 211 adjacent to the second connection segment 212 is positive. That is, along the second direction B, the polarity of the second connection segment 212 is opposite to the polarity of the adjacent first connection segment 211.

[0068] In the embodiment of the present application, the polarity of the second connection segment 212 is set to be opposite to the polarity of the adjacent first connection segment 211 along the second direction B. This allows the electrical connector 50 to extend along the second direction B and connect to multiple second connection segments 212 with the same polarity, thereby collecting and transmitting the current generated by the battery cell body 10.

[0069] Alternatively, if Figures 2 to 5As shown, the solar cell disclosed in the embodiment of the present application also includes: a second graphic area 30, which is arranged on the passivation layer and is adjacent to the first graphic area 20 along the second direction B; the second graphic area 20 has a plurality of second fine grids 31 extending along the first direction A and arranged at intervals along the second direction B, and the second graphic area 30 also has a collecting section 32, which extends along the second direction B; wherein a portion of the second fine grids 31 are connected to the collecting section 32.

[0070] like Figures 2 to 5 As shown, the second graphic region 20 is also disposed on the passivation layer, and the second graphic region 30 is disposed adjacent to the first graphic region 20 along the second direction B. The second graphic region 30 is located closer to the side of the battery cell body 10 than the first graphic region 20 .

[0071] The second graphic region 30 has a plurality of second fine grids 31 extending along the first direction A and arranged at intervals along the second direction B. The second fine grids 31 can burn through the passivation layer and be electrically connected to the doped region to collect the current generated by the cell body 10 .

[0072] like Figures 2 to 5 As shown, the second graphic area 30 also has a collecting section 32, which extends along the second direction B, and does not burn through the passivation layer. The collecting section 32 is connected to a portion of the second fine grid 31 to collect the current collected by the portion of the second fine grid 31. In addition, there is a gap between the collecting section 32 and the other portion of the second fine grid 31 to avoid short circuits in the solar cell. In other words, the other portion of the second fine grid 31 is in a disconnected state at the location of the collecting section 32.

[0073] It should be noted that the second fine grid 31 in the embodiment of the present application includes a positive second fine grid and a negative second fine grid, and the positive second fine grid and the negative second fine grid are arranged alternately along the second direction B. The collecting section 32 in the embodiment of the present application includes a plurality of collecting sections 32, and the plurality of collecting sections 32 extend along the second direction B and are arranged at intervals along the first direction A. When a collecting section 32 is connected to the positive second fine grid, there is a gap between the collecting section 32 and the negative second fine grid, that is, the negative second fine grid is in a disconnected state at the location of the collecting section 32. Another collecting section 32 adjacent to the collecting section 32 can be connected to the negative second fine grid, and there is a gap between the positive second fine grid, that is, the positive second fine grid is in a disconnected state at the location of the collecting section 32. Thus, the current collected by the positive second fine grid and the negative second fine grid is collected by the plurality of collecting sections 32.

[0074] Alternatively, if Figure 2 and Figure 5As shown, the collecting section 32 includes a collecting point 321 and an end line 322 connected to the collecting point 321, and the end line 322 is arranged at a position of the second graphic area 30 away from the first graphic area 20; the plurality of second fine grids 31 include a plurality of first sub-grids 311 and a plurality of second sub-grids 312 alternately arranged along the second direction B, wherein the plurality of first sub-grids 311 are connected to the collecting point 321 or the end line 322, and there are gaps between the plurality of second sub-grids 312 and the collecting point 321 or the end line 322.

[0075] like Figure 2 and Figure 5 As shown, the collection section 32 includes a collection point 321 and an end line 322 connected to the collection point 321, and the collection point 321 and the end line 322 are arranged along the second direction B. Along the second direction B, the collection point 321 is located in an area of ​​the second graphic area 30 close to the first graphic area 20, and the end line 322 is located in an area of ​​the second graphic area 30 far from the first graphic area 20.

[0076] The plurality of second fine grids 31 in the embodiment of the present application include first sub-grids 311 and second sub-grids 312 arranged alternately along the second direction B. The first sub-grids 311 and the second sub-grids 312 have different polarities. It can be understood that when the first sub-grid 311 is a positive second fine grid, the second sub-grid 312 is a negative second fine grid. When the first sub-grid 311 is a negative second fine grid, the second sub-grid 312 is a positive second fine grid.

[0077] like Figures 2 to 5 As shown, the plurality of first sub-grids 311 are connected to the collection point 321 or the terminal line 322, so as to collect the current collected by the plurality of first sub-grids 311 through the collection point 321 and the terminal line 322. There are gaps between the plurality of second sub-grids 312 and the collection point 321 and the terminal line 322, that is, the plurality of second sub-grids 312 are in a disconnected state at the location of the collection point 321 and the terminal line 322, so as to avoid short circuit of the solar cell.

[0078] Alternatively, if Figure 5 As shown, the plurality of second fine gates 31 include a plurality of first sub-gates 311 and a plurality of second sub-gates 312 alternately arranged along the second direction B, the plurality of first sub-gates 311 are connected to the collecting section 32, and there are gaps between the plurality of second sub-gates 312 and the collecting section 32; a first gap, a second gap, and a third gap arranged along the first direction A are provided between the second sub-gates 312 located on both sides of the collecting section 32, and along the second direction B, the first gap, the second gap, and the third gap gradually move away from the first graphic area 20; along the first direction A, the width of the first gap is d1, the width of the second gap is d2, and the width of the third gap is d3, wherein d1, d2, and d3 satisfy d1>d2>d3>0; or, satisfy d1>d2=d3>0.

[0079] Through the above arrangement, the position where the collecting section 32 is directly electrically connected to the electrical connector 50 can have a larger width to prevent the current from being too concentrated. At the position relatively far away from the electrical connection between the collecting section 32 and the electrical connector 50, the collecting section 32 is narrower to reduce the material consumption of the collecting section 32 and ensure that the length of the second fine grid 31 is larger, thereby further improving the photoelectric conversion efficiency of the solar cell.

[0080] Furthermore, through the above arrangement, the plurality of second sub-grids 312 can better collect the current generated by the cell body 10, thereby improving the photoelectric conversion efficiency of the solar cell, and can also avoid the risk of short circuit of the solar cell.

[0081] Alternatively, if Figure 5 As shown, the gathering section 32 in the embodiment of the present application includes a gathering point 321 and an end line 322 connected to the gathering point 321, and the end line 322 is connected to the side of the gathering point 321 away from the first graphic area 20; the gathering point 321 passes through the first gap, and the end line 322 passes through the second gap and the third gap.

[0082] like Figure 5 As shown, the collection section 32 in the embodiment of the present application includes a collection point 321 and an end line 322 connected to the collection point 321, and the collection point 321 and the end line 322 are arranged along the second direction B. Along the second direction B, the collection point 321 is located on a side of the second graphic area 30 close to the first graphic area 20, and the end line 322 is located on a side of the second graphic area 30 away from the first graphic area 20.

[0083] In the embodiment of the present application, by setting the collection point 321 to pass through the first gap, and setting the end line 322 to pass through the second gap and the third gap, a larger width is provided between the collection point 321 and part of the second sub-grid 312 to prevent excessive current concentration, and a smaller distance between the end line 322 and part of the second sub-grid 312 to reduce the material usage of the end line 322 and ensure that the length of the second fine grid 31 is larger, thereby further improving the photoelectric conversion efficiency of the solar cell.

[0084] Alternatively, if Figures 6 to 9 As shown, the solar cell disclosed in the embodiment of the present application also includes an insulating layer 40, wherein the insulating layer 40 includes a plurality of insulating strips 41 extending along a first direction A and arranged at intervals along a second direction B, and each insulating strip 41 covers a portion of a first connecting segment 211 located between two adjacent second connecting segments 212.

[0085] like Figures 6 to 9As shown, the insulating layer 40 in the embodiment of the present application includes a plurality of insulating strips 41 extending along the first direction A and arranged at intervals along the second direction B. Each insulating strip 41 may be in a strip-shaped structure extending along the first direction A. In the embodiment of the present application, by covering each insulating strip 41 on a surface of a first connecting section 211 away from the battery cell body 10 and being located between two adjacent second connecting sections 212, the electrical connection between the first connecting section 211 and the electrical connector 50 is blocked by the insulating strip 41, thereby preventing the solar cell from short-circuiting.

[0086] It should be noted that the insulating strip 41 in the embodiment of the present application has insulating properties and may have a certain elasticity. For example, the insulating strip 41 is an insulating glue. During the processing of the solar cell, the insulating glue is printed on the surface of the first connecting section 211 away from the cell body 10 by screen printing, and is located between two adjacent second connecting sections 212, so that a layer of insulating glue is covered on the surface of the first connecting section 211 away from the cell body 10.

[0087] Of course, the above are only individual examples of specific materials and processing methods of the insulating strip 41, and are not intended to be limiting of the present application. In actual applications, technicians can also set the specific material and processing method of the insulating strip 41 as needed. Specifically, the insulating strip 41 can be a deposited inorganic material, such as silicon nitride, silicon oxide, etc.

[0088] Alternatively, if Figure 8 As shown, along the second direction B, the distance between the side of the second connection section 212 close to the adjacent insulating strip 41 and the side of the adjacent insulating strip 41 close to the second connection section 212 is d4, satisfying d4≥40 μm.

[0089] like Figure 8 As shown, in the embodiment of the present application, along the second direction B, the distance between the side of the second connecting section 212 close to the adjacent insulating strip 41 and the side of the adjacent insulating strip 41 close to the second connecting section 212 is set to d4, satisfying d4 ≥ 40 μm. This is to avoid the insulating strip 41 blocking the second connecting section 212, affecting the reliability of the connection between the second connecting section 212 and the electrical connector 50, and further affecting the photoelectric conversion efficiency of the solar cell. Furthermore, through the above-mentioned setting, the processing of the solar cell is facilitated, and the processing efficiency and processing yield of the solar cell are improved.

[0090] Exemplarily, along the second direction B, the distance d4 between the side of the second connecting segment 212 close to the adjacent insulating strip 41 and the side of the adjacent insulating strip 41 close to the second connecting segment 212 can be set to 40μm, 42μm, 45μm, 47μm, 50μm, 52μm, 55μm, etc.

[0091] Alternatively, if Figure 4 and Figure 8 As shown, on the plane where the battery cell body 10 is located, the first connecting segment 211 has a first projection, the second connecting segment 212 has a second projection, and the first projection at least partially falls into the second projection; along the second direction B, the distance between two adjacent first fine grids 21 with the same polarity is P1, and along the first direction A, the disconnected distance between two first connecting segments 211 connected to the same second connecting segment 212 is P2, satisfying P2≤P1.

[0092] like Figure 4 and Figure 8 As shown, on the plane where the battery cell body 10 is located, the first connecting segment 211 has a first projection, and the second connecting segment 212 has a second projection. The first projection is set to at least partially fall into the second projection to ensure that the first connecting segment 211 is at least partially connected to the second connecting segment 212, so that the current collected by the first connecting segment 211 can be collected by the second connecting segment 212.

[0093] like Figure 2 As shown, the first graphic area 20 has a plurality of first fine grids 21 extending along the first direction A and arranged alternately along the second direction B. The plurality of first fine grids 21 include a plurality of positive first fine grids and a plurality of negative first fine grids, and the plurality of positive first fine grids and the plurality of negative first fine grids are arranged alternately along the second direction B. That is, along the second direction B, the two first fine grids adjacent to each positive first fine grid are negative first fine grids, and the two first fine grids adjacent to each negative first fine grid are positive first fine grids.

[0094] like Figure 4 and Figure 8 As shown, along the second direction B, the distance between two adjacent first fine grids 21 of the same polarity is P1. This distance can be the distance between two adjacent positive first fine grids, or can be the distance between two adjacent negative first fine grids. The following description will be made by taking the distance between two adjacent positive first fine grids as an example.

[0095] It should be noted that, in two adjacent positive first fine grids, along the second direction B, the distance may be the distance between two adjacent first connecting segments 211, or the distance between two adjacent second connecting segments 212. When the distance is the distance between two adjacent second connecting segments 212, the distance may be the distance between the side of one second connecting segment 212 close to the other second connecting segment 212 and the side of the other second connecting segment 212 close to the second connecting segment 212. The distance may also be the distance between the middle position of one second connecting segment 212 and the middle position of the other second connecting segment 212 along the second direction B. When the distance is the distance between two adjacent first connecting segments 211, the specific length of the distance may be calculated with reference to the method of the second connecting segment 212, and will not be repeated here.

[0096] like Figure 4 and Figure 8 As shown, in the embodiment of the present application, the distance P1 between two adjacent first fine grids 21 with the same polarity along the second direction B is set to be greater than or equal to the disconnected distance P2 between two first connecting segments 211 connected to the same second connecting segment 212 along the first direction A. In this way, the current generated by the regions on both sides of each first fine grid 21 on the cell body 10 along the second direction B can be better collected, thereby improving the photoelectric conversion efficiency of the solar cell.

[0097] Further, starting from the collection distance, P1 in the embodiment of the present application represents a better collection distance in the second direction B, and P2 represents a better collection distance in the first direction A. P2 is set to be less than or equal to P1 to ensure that the ends of the first fine gate 21 located on both sides of P2 can collect the current in the area covered by the second connection segment 212.

[0098] Optionally, along the first direction A, the length of the second connecting segment 212 is P3, satisfying P2<P3; and / or, P2≥0 mm, and 0.5 mm≤P1≤1.5 mm.

[0099] In the embodiment of the present application, along the first direction A, the disconnected distance P2 between the two first connection segments 211 connected to the same second connection segment 212 is set to be smaller than the length P3 of the second connection segment 212. So that the first connection segment 211 is at least partially disposed in the region where the second connection segment 212 is located, the first connection segment 211 can burn through the passivation layer in the region where the second connection segment 212 is located, so as to collect the current generated by the doping region corresponding to the region where the second connection segment 212 is located, thereby further improving the photoelectric conversion efficiency of the solar cell.

[0100] In the embodiment of the present application, along the first direction A, the disconnected distance P2 between the two first connecting segments 211 connected to the same second connecting segment 212 is set to be greater than or equal to 0 mm. For example, along the first direction A, the disconnected distance P2 between the two first connecting segments 211 connected to the same second connecting segment 212 can be set to 0 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, etc.

[0101] In the embodiment of the present application, the distance P1 between two adjacent first fine grids 21 with the same polarity is set to be greater than or equal to 0.5 mm and less than or equal to 1.5 mm along the second direction B. Exemplarily, the distance P1 between two adjacent first fine grids 21 with the same polarity along the second direction B can be set to 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, etc.

[0102] Of course, the above are only individual examples of the specific lengths of P1 and P2 in the embodiment of the present application, and are not intended to be limiting of the present application. In actual applications, technicians can set the specific lengths of P1 and P2 as needed, as long as P2≤P1 is satisfied.

[0103] Reference Figure 6 , showing a top view of the photovoltaic assembly in the first graphic area in the embodiment of the present application; referring to Figure 7 , shows a cross-sectional view of the photovoltaic module in the first graphic area in the embodiment of the present application, which is a cross-sectional view along the welding strip direction; refer to Figure 8 , showing a partial top view of the photovoltaic assembly in the first graphic area in the embodiment of the present application; referring to Fig. 9 , showing Figure 8 A cross-sectional view of the photovoltaic module along the C1-C2 direction.

[0104] like Figures 6 to 9As shown, the embodiment of the present application further discloses a photovoltaic module, the photovoltaic module includes a solar cell, the solar cell includes a cell body 10, the cell body 10 includes a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; a first graphic area 20, the first graphic area 20 is arranged on the first surface of the cell body 10, the first graphic area 20 has a plurality of first fine grids 21 extending along a first direction A and arranged at intervals along a second direction B, each of the first fine grids 21 includes a plurality of first connecting segments 211 arranged at intervals along the first direction A and a connecting A second connecting segment 212 connected between two adjacent first connecting segments 211, the second direction B intersects with the first direction A; along the second direction B, multiple second connecting segments 212 are arranged at intervals, and at least one first connecting segment 211 is arranged between two adjacent second connecting segments 212, wherein the first connecting segment 211 burns through the passivation layer and is electrically connected to the doping region, and the second connecting segment 212 does not burn through the passivation layer; an electrical connector 50, the electrical connector 50 extends along the second direction B, the electrical connector 50 is electrically connected to the second connecting segment 212, and the electrical connector 50 is insulated from the first connecting segment 211.

[0105] like Figures 6 to 9 As shown, an embodiment of the present application discloses a photovoltaic module, which includes a solar cell. The solar cell is a core component of the photovoltaic module and can convert solar energy into electrical energy.

[0106] It should be noted that the solar cell included in the photovoltaic assembly disclosed in the embodiment of the present application is a busbar-less solar cell, which has the same structure as the busbar-less solar cell described in the above embodiment, and has the same or similar beneficial effects, which will not be described in detail here.

[0107] The photovoltaic assembly disclosed in the embodiment of the present application also includes an electrical connector 50, which extends along the second direction B and is electrically connected to the second connection segments 212 of the plurality of first fine grids 21, so that the current collected by the second connection segments 212 of the plurality of first fine grids 21 can be transmitted to an external circuit through the electrical connector 50.

[0108] For example, the electrical connector 50 may be welded to the second connection segments 212 of the plurality of first fine grids 21, so that the electrical connector 50 is electrically connected to the second connection segments 212 of the plurality of first fine grids 21. Of course, the above are only individual examples of specific ways in which the electrical connector 50 is electrically connected to the second connection segments 212 of the plurality of first fine grids 21, and are not intended to be limitations of the present application. In actual applications, technicians may also set specific ways in which the electrical connector 50 is electrically connected to the second connection segments 212 of the plurality of first fine grids 21 as needed.

[0109] It should be noted that the electrical connector 50 in the embodiment of the present application is insulated from the first connecting section 211. Specifically, an insulating layer 40 may be provided between the electrical connector 50 and the first connecting section 211 to block the electrical connector 50 and the first connecting section 211 through the insulating layer 40 to prevent a short circuit in the photovoltaic module.

[0110] Alternatively, if Figures 6 to 9 As shown, the electrical connector 50 in the embodiment of the present application is insulated from the first connecting section 211 by the insulating layer 40; the insulating layer 40 includes a plurality of insulating strips 41 arranged at intervals along the second direction B, and each insulating strip 41 is arranged between a first connecting section 211 and the electrical connector 50.

[0111] like Figures 6 to 9 As shown, the insulating layer 40 in the embodiment of the present application includes a plurality of insulating strips 41, and the plurality of insulating strips 41 are arranged at intervals along the second direction A. Each insulating strip 31 is disposed between a first connecting section 211 and a corresponding electrical connector 50, so that each insulating strip 31 blocks the first connecting section 211 and the corresponding electrical connector 50, thereby preventing the first connecting section 211 and the electrical connector 50 from being electrically connected, thereby preventing a short circuit in the photovoltaic module.

[0112] Alternatively, if Figures 6 to 9 As shown, the photovoltaic component disclosed in the embodiment of the present application also includes a first bonding layer 60, wherein the first bonding layer 60 includes a plurality of first bonding portions 61 arranged at intervals along the second direction B, each first bonding portion 61 is arranged between a second connecting section 212 and the electrical connector 50; and / or, along the thickness direction of the photovoltaic component, the height of the first bonding portion 61 is greater than the height of the insulating strip 41.

[0113] like Figures 6 to 9 As shown, the photovoltaic component disclosed in the embodiment of the present application also includes a first bonding layer 60, which includes a plurality of first bonding portions 61, each of which is a strip structure extending along the first direction A, and the plurality of first bonding portions 61 are arranged at intervals along the second direction B.

[0114] In the embodiment of the present application, each first joint portion 61 is disposed between a second connection segment 212 and the corresponding electrical connector 50 , so as to improve the reliability of the connection between the second connection segment 212 and the corresponding electrical connector 50 through the first joint portion 61 .

[0115] It should be noted that the first bonding layer 60 in the embodiment of the present application is conductive, and metal paste can be printed on the surface of the second connecting section 212 away from the battery cell body 10 by screen printing, so as to form the first bonding layer 60 between the second connecting section 212 and the corresponding electrical connector 50. Exemplarily, the first bonding layer 60 can be a tin layer.

[0116] like Figure 7 and Fig. 9 As shown, along the thickness direction of the photovoltaic module, the height of the first joint portion 61 is set to be greater than the height of the insulating strip 41 to prevent the insulating strip 41 from being too high and supporting the electrical connector 50, thereby affecting the reliability of the electrical connection between the first joint portion 61 and the electrical connector 50.

[0117] Alternatively, if Figures 6 to 9 As shown, along the first direction A, the length of the insulating strip 41 is greater than the length of the first joining portion 61 ; and / or, the length of the insulating strip 41 and the length of the first joining portion 61 are both greater than the width of the electrical connector 50 .

[0118] like Figures 6 to 9 As shown, in the embodiment of the present application, along the first direction A, the length of the insulating strip 41 is set to be greater than the length of the first joint portion 61. In this way, when the electrical connector 50 is offset, the insulating strip 41 can still ensure the reliability of the insulation between the first connecting section 211 and the electrical connector 50, thereby preventing the photovoltaic module from short-circuiting.

[0119] In the embodiment of the present application, along the first direction A, the length of the insulating strip 41 and the length of the first joint portion 61 are both set to be greater than the width of the electrical connector 50. First, along the first direction A, the length of the first joint portion 61 is set to be greater than the width of the electrical connector 50, so that the electrical connector 50 can be more reliably connected to the first joint portion 61, thereby improving the reliability of the electrical connection between the electrical connector 50 and the first connecting section 211.

[0120] Furthermore, along the first direction A, the length of the insulating strip 41 is set to be greater than the length of the first connecting portion 61, thereby improving the reliability of insulation between the first connecting section 211 and the electrical connector 50 and avoiding short circuits in the photovoltaic module.

[0121] Alternatively, if Fig. 9 As shown, along the second direction B, the height of the middle area of ​​the insulating strip 41 is higher than the height of the areas on both sides of the insulating strip 41 .

[0122] like Fig. 9 As shown, in the embodiment of the present application, along the second direction B, the height of the middle area of ​​the insulating strip 41 is set to be higher than the height of the areas on both sides of the insulating strip 41. Through the above arrangement, it is possible to prevent the contact area between the electrical connector 50 and the insulating strip 41 from being too large, thereby affecting the reliability of the electrical connection between the electrical connector 50 and the first joint portion 61.

[0123] Furthermore, through the above arrangement, while ensuring the insulation, the amount of insulating material in the insulating strip 41 can be reduced, thereby reducing the cost of the photovoltaic module.

[0124] Alternatively, if Fig. 9 As shown, the photovoltaic component disclosed in the embodiment of the present application also includes a second bonding layer 70, wherein the second bonding layer 70 includes a plurality of second bonding portions extending along the first direction A and arranged at intervals along the second direction B, each second bonding portion is arranged between an insulating strip 41 and the electrical connector 50; and / or each second bonding portion is arranged between two first bonding portions 61 adjacently arranged along the second direction B.

[0125] like Fig. 9 As shown, the photovoltaic component disclosed in the embodiment of the present application also includes a second bonding layer 70, and the second bonding layer 70 includes a plurality of second bonding portions, each of which is a strip structure extending along the first direction A, and the plurality of second bonding portions are arranged at intervals along the second direction B.

[0126] In the embodiment of the present application, each second joining portion is disposed between an insulating strip 41 and the electrical connector 50 , and, along the second direction B, each second joining portion is disposed between two adjacent first joining portions 61 .

[0127] Preferably, along the second direction B, each second joining portion can be connected to two adjacent first joining portions 61 to further improve the reliability of the connection between the electrical connector 50 and the second connecting section 212 and prevent the electrical connector 50 from protruding and affecting the appearance of the photovoltaic module.

[0128] It should be noted that the second joint portion 71 in the embodiment of the present application is mainly a combination of organic matter and solder. Among them, the source of the organic matter is mainly the organic material in the first joint portion 61. The source of the solder is mainly the solder brought by the electrical connector 50 and other solders extending therefrom. The second joint portion 71 is more in the gap between the electrical connector 50 and the insulating strip 41.

[0129] Optionally, the solar cell disclosed in the embodiment of the present application also includes: a second graphic area 30, which is arranged on the first surface of the cell body 10 and is spaced apart from the first graphic area 20 along the second direction B, and has a collecting section 32 in the second graphic area 30; the end of the electrical connector 50 and the projection of the collecting section 32 on the cell body 10 have an overlapping area.

[0130] In the embodiment of the present application, a second graphic area 30 is further provided on the back of the cell body 10. The solar cell with the second graphic area 30 in the embodiment of the present application has the same structure as the solar cell with the second graphic area 30 in the above embodiment, and its beneficial effects are also the same or similar. No further description will be given here.

[0131] The photovoltaic assembly disclosed in the embodiment of the present application further includes an electrical connector 50, which extends along the second direction B. The electrical connector 50 and the projection of the collecting section 32 on the solar cell body 10 have an overlapping area. In other words, the electrical connector 50 extends above the collecting section 32 and is connected to the collecting section 32 to transmit the current collected by the collecting section 32 to the external circuit.

[0132] Exemplarily, the collection section 32 includes a collection point 321 and a terminal line 322 connected to the collection point 321. The electrical connector 50 can be electrically connected to the collection point 321, that is, the electrical connector 50 is disposed above the collection point 321 and connected to the collection point 321, and the electrical connector 50 extends to the top of the terminal line 322 and is electrically connected to the terminal line 322. Thus, the current collected by the collection point 321 and the terminal line 322 can be transmitted to an external circuit through the electrical connector 50, so as to improve the current collection efficiency and the photoelectric conversion efficiency of the photovoltaic module.

[0133] Optionally, along the second direction B, the ratio of the length of the overlapping area to the length of the collecting section 32 is greater than or equal to 0.1 and less than or equal to 0.5. In the embodiment of the present application, by setting the ratio of the length of the overlapping area to the length of the collecting section 32 to be greater than or equal to 0.1 and less than or equal to 0.5, the reliability of the electrical connection between the electrical connector 50 and the collecting section 32 is ensured, thereby improving the reliability of current collection and improving the photoelectric conversion efficiency of the photovoltaic module.

[0134] By way of example, the ratio of the length of the overlapping region to the length of the collecting section 32 may be set to 0.1, 0.2, 0.3, 0.4, 0.5, or the like.

[0135] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0136] Although the optional embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0137] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0138] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. At the same time, for those skilled in the art, according to the principle and implementation mode of the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A solar cell, characterized in that: The solar cell comprises: A cell body, the cell body comprising a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; a first graphic region, the first graphic region being disposed on the passivation layer, the first graphic region having a plurality of first fine grids extending along a first direction and arranged at intervals along a second direction, each of the first fine grids comprising a plurality of first connecting segments arranged at intervals along the first direction and a second connecting segment connected between two adjacent first connecting segments, the second direction intersecting the first direction; Along the second direction, a plurality of the second connecting segments are arranged at intervals, and at least one of the first connecting segments is provided between two adjacent second connecting segments, wherein the first connecting segment burns through the passivation layer and is electrically connected to the doped region, and the second connecting segment does not burn through the passivation layer; Furthermore, along the second direction, the width of the second connecting segment is greater than the width of the first connecting segment.

2. The solar cell according to claim 1, characterized in that: Along the first direction, the length of each of the first connecting segments is greater than the length of each of the second connecting segments.

3. The solar cell according to claim 1, characterized in that: Along the second direction, the polarity of the second connecting segment is opposite to the polarity of the adjacent first connecting segment.

4. The solar cell according to claim 1, characterized in that: The solar cell further comprises: a second graphic region, the second graphic region being disposed on the passivation layer and adjacent to the first graphic region along the second direction; The second graphic region has a plurality of second fine grids extending along the first direction and arranged at intervals along the second direction, and the second graphic region also has a collecting segment extending along the second direction; Part of the second fine grids is connected to the collecting segment.

5. The solar cell according to claim 4, characterized in that: The collection section includes a collection point and an end line connected to the collection point, and the end line is arranged at a position of the second graphic area away from the first graphic area; The plurality of second fine gates include a plurality of first sub-gates and a plurality of second sub-gates alternately arranged along the second direction, wherein the plurality of first sub-gates are connected to the collection point or the terminal line, and there are gaps between the plurality of second sub-gates and the collection point or the terminal line.

6. The solar cell according to claim 4, characterized in that: The plurality of second fine grids include a plurality of first sub-grids and a plurality of second sub-grids alternately arranged along the second direction, the plurality of first sub-grids are connected to the collecting segment, and there are gaps between the plurality of second sub-grids and the collecting segment; A first gap, a second gap and a third gap arranged along the first direction are provided between the second sub-gates located on both sides of the collecting segment, and along the second direction, the first gap, the second gap and the third gap gradually move away from the first graphic area; Along the first direction, the width of the first gap is d1, the width of the second gap is d2, and the width of the third gap is d3, wherein d1, d2, and d3 satisfy d1>d2>d3>0; or, satisfy d1>d2=d3>0.

7. The solar cell according to claim 6, characterized in that: The collection segment includes a collection point and an end line connected to the collection point, wherein the end line is connected to a side of the collection point away from the first graphic area; The collection point passes through the first gap, and the terminal line passes through the second gap and the third gap.

8. The solar cell according to claim 3, characterized in that: The solar cell further comprises an insulating layer, wherein: The insulating layer includes a plurality of insulating strips extending along the first direction and arranged at intervals along the second direction, each of the insulating strips covering a portion of one of the first connecting segments between two adjacent second connecting segments.

9. The solar cell according to claim 8, characterized in that: Along the second direction, a distance between a side of the second connecting section close to the adjacent insulating strip and a side of the adjacent insulating strip close to the second connecting section is d4, satisfying d4≥40 μm.

10. The solar cell according to claim 3, characterized in that: On the plane where the battery cell body is located, the first connecting segment has a first projection, the second connecting segment has a second projection, and the first projection at least partially falls within the second projection; Along the second direction, the distance between two adjacent first fine grids with the same polarity is P1, and along the first direction, the distance between two first connecting segments connected to the same second connecting segment is P2, satisfying P2≤P1.

11. The solar cell according to claim 10, characterized in that: Along the first direction, the length of the second connecting segment is P3, satisfying P2<P3; And / or, P2≥0mm, and 0.5mm≤P1≤1.5mm.

12. A photovoltaic module, characterized in that: include: A solar cell, the solar cell comprising a cell body, the cell body comprising a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; A first graphic region, the first graphic region is disposed on the first surface of the battery cell body, the first graphic region has a plurality of first fine grids extending along a first direction and arranged at intervals along a second direction, each of the first fine grids includes a plurality of first connecting segments arranged at intervals along the first direction and a second connecting segment connected between two adjacent first connecting segments, and the second direction intersects the first direction; Along the second direction, a plurality of the second connection segments are arranged at intervals, and at least one first connection segment is arranged between two adjacent second connection segments, wherein the first connection segment burns through the passivation layer and is electrically connected to the doped region, and the second connection segment does not burn through the passivation layer; Furthermore, along the second direction, the width of the second connecting section is greater than the width of the first connecting section; An electrical connector, the electrical connector extends along the second direction, the electrical connector is electrically connected to the second connecting section, and the electrical connector is insulated from the first connecting section.

13. The photovoltaic module according to claim 12, characterized in that: The electrical connector is insulated from the first connecting section by an insulating layer; The insulating layer includes a plurality of insulating strips arranged at intervals along the second direction, and each of the insulating strips is disposed between one of the first connecting sections and the electrical connector.

14. The photovoltaic module according to claim 13, characterized in that: The photovoltaic module further comprises a first bonding layer, wherein: The first bonding layer includes a plurality of first bonding portions arranged at intervals along the second direction, each of the first bonding portions being arranged between one of the second connecting sections and the electrical connector; And / or, along the thickness direction of the photovoltaic module, the height of the first joint portion is greater than the height of the insulating strip.

15. The photovoltaic module according to claim 14, characterized in that: Along the first direction, the length of the insulating strip is greater than the length of the first joint portion; And / or, the length of the insulating strip and the length of the first joining portion are both greater than the width of the electrical connector.

16. The photovoltaic module according to claim 13, characterized in that: Along the second direction, the height of the middle region of the insulating strip is higher than the height of the regions on both sides of the insulating strip.

17. The photovoltaic module according to claim 14, characterized in that: The photovoltaic module further comprises a second bonding layer, wherein: The second bonding layer comprises a plurality of second bonding portions extending along the first direction and arranged at intervals along the second direction, each of the second bonding portions being arranged between one of the insulating strips and the electrical connector; And / or, each of the second joining portions is arranged between two adjacent first joining portions along the second direction.

18. The photovoltaic module according to claim 12, characterized in that: The solar cell further comprises: A second graphic region, the second graphic region is disposed on the first surface of the battery sheet body and is spaced apart from the first graphic region along the second direction, and the second graphic region has a collecting section; The end of the electrical connector and the projection of the collecting section on the battery cell body have an overlapping area.

19. The photovoltaic module according to claim 18, characterized in that: Along the second direction, a ratio of a length of the overlapping region to a length of the collecting section is greater than or equal to 0.1 and less than or equal to 0.5.

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