Solar cell and solar module

Abstract

To provide a solar cell capable of improving photoelectric conversion efficiency of the solar cell by decreasing a transport distance of a current and decreasing an internal loss of the solar cell, and a solar module.SOLUTION: A first finger grid 21 includes a plurality of first connection segments 211 disposed at intervals in a first direction A and second connection segments 212 connected between two adjacent first connection segments 211, and a second direction B intersects with the first direction A. The plurality of second connection segments 212 is arranged at intervals in the second direction B, and at least one first connection segments 211 is disposed between two adjacent second connection segments 212. The first connection segments 211 fire through a passivation layer covering a doped region which is formed on a substrate and are electrically connected with the doped region, and the second connection segments 212 do not fire through the passivation layer.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This application relates to the technical field of photovoltaics, and in particular to solar cells and solar modules.

[0002] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application filed with the Patent Office of the People's Republic of China on June 17, 2024, bearing application number 202410780857.3, entitled "Solar Cell and Solar Module," and to a Chinese patent application filed with the Patent Office of the People's Republic of China on June 3, 2024, bearing application number 202421258254.9, entitled "Solar Module and Solar System," and to a Chinese patent application filed with the Patent Office of the People's Republic of China on November 5, 2024, bearing application number 202411572227.3, entitled "Solar Cell and Solar Module," the entire contents of which are incorporated herein by reference. [Background technology]

[0003] A solar cell has a front surface facing sunlight and a back surface facing away from sunlight. In a back-contact solar cell, the positive and negative grid lines of the battery cell are all located on the back surface of the battery cell, preventing the positive and negative grid lines from blocking the front surface of the solar cell and improving the photoelectric conversion efficiency of the solar cell.

[0004] 1 , in the prior art, a back-contact solar cell is provided on its back surface with positive finger grids 80 and negative finger grids 81 extending in a first direction and alternately arranged in a second direction, thereby collecting current generated in the battery cell. The back surface of the battery cell is further provided with positive main grids 82 and negative main grids 83 extending in a second direction and arranged at intervals in the first direction, and the positive main grids 82 and negative main grids 83 each include solder contacts 84 alternately arranged in the second direction and connecting wires 85 connected to the solder contacts 84. Ribbons extend in the second direction and are connected to the solder contacts 84, and current is transported to the ribbons via the solder contacts 84, thereby collecting and transporting the current.

[0005] Taking the positive main grid 82 as an example, the positive finger grid 80 is connected to the solder contacts 84 of the positive main grid 82 in the region where the solder contacts 84 of the positive main grid 82 are located, and can collect the current collected by the positive finger grid 80 via the solder contacts 84 of the positive main grid 82. The negative finger grid 81 is spaced apart from the solder contacts 84 of the positive main grid 82 to prevent short-circuiting of the battery cells. The positive finger grid 80 is connected to the connection wire 85 of the positive main grid 82 in the region where the connection wire 85 of the positive main grid 82 is located, and the current collected by the positive finger grid 80 is transported to the solder contacts 84 of the positive main grid 82 via the connection wire 85 of the positive main grid 82, and then transported to the corresponding ribbon via the solder contacts 84 of the positive main grid 82, thereby collecting and transporting the current. The negative finger grid 81 is spaced apart from the connecting wire 85 of the positive main grid 82 to prevent short circuiting of the battery cells. It should be noted that the principle of the negative main grid 83 is the same as that of the positive main grid 82, so a detailed description will be omitted.

[0006] However, if the electrode is provided as described above, the distance that the current must travel will be long, increasing internal loss and affecting the photoelectric conversion efficiency of the battery cell. Summary of the Invention [Problem to be solved by the invention]

[0007] The present application discloses a solar cell and a solar module to solve or at least partially solve the problems existing in the prior art, such as long current transport distances and large internal losses, which affect the photoelectric conversion efficiency of the battery cell. [Means for solving the problem]

[0008] In order to solve the above technical problems, the present application is realized as follows:

[0009] The present application discloses a solar cell including: a battery cell body including a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; and a first pattern region provided on the passivation layer, the first pattern region having a plurality of first finger grids extending in a first direction and arranged at intervals in a second direction, each of the first finger grids including a plurality of first connection segments arranged at intervals in the first direction and a second connection segment connected between two adjacent first connection segments, the second direction intersecting the first direction, the second connection segments arranged at intervals in the second direction, at least one first connection segment provided between two adjacent second connection segments, the first connection segments electrically connected to the doped region by firing through the passivation layer, and the second connection segments not firing through the passivation layer. [Effects of the Invention]

[0010] When configured as described above, the first connection segment can collect the current generated in the battery cell body, and the second connection segment can directly collect the current collected by the first connection segment connected to the second connection segment, thereby reducing the current transport distance, reducing internal losses in the solar cell, and improving the photoelectric conversion efficiency of the solar cell. [Brief explanation of the drawings]

[0011] [Figure 1] 1 shows a schematic diagram of a partial structure of a solar cell according to the prior art. [Figure 2] 1 shows a top view of a solar cell according to one embodiment of the present application. [Figure 3] 1 shows a top view of a first pattern area according to one embodiment of the present application. [Figure 4] 1 shows a partial top view of a first pattern area according to one embodiment of the present application. [Figure 5] 1 shows a top view of a second pattern area according to one embodiment of the present application. [Figure 6] 1 shows a structural schematic diagram 1 of a solar cell described in one embodiment of the present application. [Figure 7] 2 shows a structural schematic diagram 2 of a solar cell described in one embodiment of the present application. [Figure 8] 3 shows a structural schematic diagram of a solar cell described in one embodiment of the present application. [Figure 9] 4 shows a structural schematic diagram of a solar cell described in one embodiment of the present application. [Figure 10] 1 shows a structural schematic diagram of a first connection block and the first sub-finger grid according to an embodiment of the present application; [Figure 11] 1 shows a structural schematic diagram of a first grid line pattern area according to one embodiment of the present application; [Figure 12] 12 shows a cross-sectional view taken along the line AA in FIG. [Figure 13] 13 is a partial enlarged view of a portion B in FIG. 12. [Figure 14] 1 shows a partial cross-sectional view 1 of a solar cell according to another embodiment of the present application. [Figure 15] 2 shows a partial cross-sectional view 2 of a solar cell according to another embodiment of the present application. [Figure 16] 1 shows a schematic diagram of the structure of a metal particle described in one example of the present application. [Figure 17] 9 is a partial enlarged view of a portion C in FIG. 8. [Figure 18] 18 shows a cross-sectional view of the portion DD in FIG. 17. [Figure 19] 1 shows a top view of a solar module according to one embodiment of the present application in a first pattern area. [Figure 20] 1 shows a cross-sectional view of a solar module according to one embodiment of the present application at a first pattern area. [Figure 21] 1 shows a partial top view of a solar module according to one embodiment of the present application in a first pattern area. [Figure 22] 22 shows a cross-sectional view of the solar module taken along the C1-C2 direction in FIG. 21. [Figure 23] 1 shows a partial structural schematic diagram 1 of a solar module described in one embodiment of the present application. [Figure 24] 2 shows a partial structure schematic diagram 2 of a solar module described in one embodiment of the present application. [Figure 25] 25 is a partial enlarged view of a portion E in FIG. 24. [Figure 26] 26 shows a cross-sectional view of the FF portion in FIG. 25. DETAILED DESCRIPTION OF THE INVENTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and are not all of the embodiments, and all other embodiments that can be obtained by those skilled in the art based on the embodiments of the present invention without any creative efforts fall within the scope of protection of the present invention.

[0013] It should be understood that the references to "one embodiment" or "one embodiment" throughout the specification mean that a particular feature, structure, or characteristic associated with an embodiment is included in at least one embodiment of the present invention. Thus, the references to "one embodiment" or "one embodiment" throughout the specification are not necessarily all referring to the same embodiment. However, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0014] As shown in FIGS. 2 to 5, one embodiment of the present application includes a battery cell body 10 including a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region, and a first pattern region 20 provided on the passivation layer and having a plurality of first finger grids 21 extending in a first direction A and arranged at intervals in a second direction B, each first finger grid 21 including a plurality of first connection segments 211 arranged at intervals in the first direction A and a connection between two adjacent first connection segments 211. a second direction B intersecting the first direction A, the second connection segments 212 are arranged at intervals in the second direction B, and at least one first connection segment 211 is provided between two adjacent second connection segments 212, the first connection segments 211 being electrically connected to the doped region by firing through the passivation layer, and the second connection segments 212 not being fired through the passivation layer.

[0015] As shown in FIGS. 2 to 5, the solar cell includes a battery cell body 10 and a first pattern region 20 provided on the passivation layer. Here, the battery cell body 10 is a core component of the solar cell and can convert solar energy into electrical energy. The battery cell body 10 has a front surface that is a light-receiving surface facing sunlight. The battery cell body 10 also has a back surface that is a non-light-receiving surface facing away from sunlight. In the embodiments of the present application, the first pattern region 20 may be provided on the front surface of the battery cell body 10 or on the back surface of the battery cell body 10, and the present application is not specifically limited thereto. In the following, the relevant description will be given taking as an example a case in which the first pattern region 20 is provided on the back surface of the battery cell body 10, i.e., a solar cell is a back-contact type solar cell.

[0016] It should be noted that in some embodiments, the battery cell body 10 includes a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region. A first pattern region 20 is provided on the passivation layer, and the first pattern region 20 collects and collects current generated at a corresponding position on the battery cell body 10.

[0017] 2 to 5, the first pattern region 20 is provided on the back surface of the battery cell body 10, thereby shielding the front surface of the battery cell body 10 and preventing any impact on the photoelectric conversion efficiency of the battery cell body 10. The first pattern region 20 has a plurality of first finger grids 21 extending in a first direction A and arranged at intervals in a second direction B, and the first finger grids 21 collect and collect current generated in the battery cell body 10. Here, the first pattern region 20 is the region occupied by the plurality of first finger grids 21 on the back surface of the battery cell body 10.

[0018] It should be noted that the battery cell body 10 may optionally have a rectangular structure, a square structure, or an approximately rectangular structure. Here, the approximately rectangular structure means that the rectangular battery cell has a circular chamfer or a square chamfer, and the circular chamfer or the square chamfer is directly connected to one side edge of the battery cell body 10. Of course, the battery cell body 10 may have other shapes. In the embodiments of the present application, the specific structure of the battery cell body 10 is not particularly limited. The following related description will be given taking the battery cell body 10 having a rectangular structure as an example.

[0019] It should be noted that, optionally, 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, and 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. The present application does not specifically limit this.

[0020] It should be noted that, in the embodiments of the present application, fire-through refers to the gridline metal material penetrating the passivation layer into the doped region to make electrical contact after firing, curing, or forming of the gridlines. The gridline material may have a glass component that attacks the passivation layer (e.g., an insulating material such as aluminum oxide, silicon nitride, or silicon oxide) and allows the gridline metal material to enter the doped region. Optionally, the gridline metal material can form a metal silicide or metal crystal with the material of the doped region.

[0021] As shown in FIGS. 2 to 5 , each first finger grid 21 includes a plurality of first connection segments 211 spaced apart in 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 has a strip-like structure extending in the first direction A. The first connection segment 211 is electrically connected to the doped region by firing through the passivation layer, and thus can collect current generated in the battery cell body 10. The second connection segment 212 located between two adjacent first connection segments 211 does not fire through the passivation layer, and therefore directly collects the current collected by the first connection segment 211. This reduces the current transport distance, reduces internal losses in the solar cell, and improves the photoelectric conversion efficiency of the solar cell.

[0022] Furthermore, in the solar module, the second connection segment 212 is connected to the electrical connection member 50, so that the current collected by the second connection segment 212 is transported to an external circuit via the electrical connection member 50. The second connection segment 212 and the electrical connection member 50 must be soldered together, and if the second connection segment 212 fires through the passivation layer to electrically connect to the doped region, the soldering is likely to affect the doped region, causing heat damage and reducing the current collection efficiency of the solar module.

[0023] 2 to 5, the second connection segments 212 are arranged at intervals in the second direction B, with one first connection segment 211 provided between two adjacent second connection segments 212. It can be understood that the second connection segments 212 arranged at intervals in the second direction B are first finger-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 segment 212. For example, when the second connection segments 212 arranged at intervals in the second direction B are positive electrode first finger-grids 21, the first connection segment 211 located between two adjacent second connection segments 212 is a negative electrode first finger-grid 21. In the second direction B, when a plurality of second connection segments 212 arranged at intervals are negative electrode first finger grids 21, the first connection segment 211 located between two adjacent second connection segments 212 is a positive electrode first finger grid 21.

[0024] In the embodiment of the present application, a plurality of second connection segments 212 are arranged at intervals in the second direction B, and one first connection segment 211 is provided between two adjacent second connection segments 212, thereby allowing the electrical connection member 50 to extend in the second direction B and connect to a plurality of second connection segments 212 of the same polarity, thereby contributing to collecting and transporting the current generated in the battery cell body 10.

[0025] It should be noted that the solar cell disclosed in some embodiments of the present application does not have a main grid on its surface, that is, the solar cell disclosed in the embodiments of the present application is a solar cell without a main grid. In some other embodiments, a main grid may be locally present on the surface of the solar cell, or a main grid may be provided below some electrical connection members, but a complete main grid structure may not be provided below at least some of the electrical connection members. It should be understood that the electrical connection member 50 is directly connected to the second connection segment 212 of the first finger-grid 21 to collect and transport the current collected by the first finger-grid 21.

[0026] The solar cell disclosed in the embodiments of the present application can collect current generated in the battery cell body 10 via the first connection segment 211, and the second connection segment 212 can directly collect the current collected by the first connection segment 211 connected to the second connection segment 212. This reduces the current transport distance, reduces internal losses in the solar cell, and improves the photoelectric conversion efficiency of the solar cell.

[0027] Optionally, as shown in Figures 2 to 5, in the first direction A, the length of each first connection segment 211 is greater than the length of each second connection segment 212, and / or in the second direction B, the width of each second connection segment 212 is greater than the width of each first connection segment 211.

[0028] 2 to 5, the length of each first connection segment 211 in the first direction A is made longer than the length of each second connection segment 212. This makes the first connection segments 211 longer than the second connection segments 212, allowing them to more efficiently collect the current generated in the battery cell body 10 and improve the photoelectric conversion efficiency of the solar cell.

[0029] 2 to 5, the width of each second connection segment 212 is greater than the width of each first connection segment 211 in the second direction B. This makes the connection between the second connection segment 212 and the electrical connection member 50 more reliable, and allows the current collected by the second connection segment 212 to be transported to an external circuit via the electrical connection member 50.

[0030] Optionally, in the second direction B, the polarity of the second connecting segment 212 is opposite to the polarity of the adjacent first connecting segment 211 .

[0031] As shown in FIGS. 2 to 5, the second connection segments 212 are arranged at intervals in the second direction B, with one first connection segment 211 provided between two adjacent second connection segments 212. In the second direction B, when the polarity of a second connection segment 212 is positive, the first connection segment 211 adjacent to the second connection segment 212 is negative. When the polarity of a second connection segment 212 is negative, the first connection segment 211 adjacent to the second connection segment 212 is positive. In other words, in the second direction B, the polarity of the second connection segment 212 is opposite to the polarity of the adjacent first connection segment 211.

[0032] In the second direction B, the polarity of the second connection segments 212 is opposite to the polarity of the adjacent first connection segments 211. This allows the electrical connection member 50 to extend in the second direction B and connect to multiple second connection segments 212 of the same polarity, contributing to the collection and transport of current generated in the battery cell body 10.

[0033] Optionally, as shown in Figures 2 to 5, the solar cell disclosed in the examples of the present application further includes a second pattern area 30 provided on the passivation layer and adjacent to the first pattern area 20 in the second direction B, and the second pattern area 30 has a plurality of second finger grids 31 extending in the first direction A and arranged at intervals in the second direction B, and the second pattern area 30 further has current collecting segments 32 extending in the second direction B, and a portion of the second finger grids 31 are connected to the current collecting segments 32.

[0034] 2 to 5, the second pattern region 30 is also provided in the passivation layer and is provided adjacent to the first pattern region 20 in the second direction B. The second pattern region 30 is located in a region closer to the side edge of the battery cell body 10 than the first pattern region 20.

[0035] Here, the second pattern region 30 has a plurality of second finger grids 31 extending in a first direction A and arranged at intervals in a second direction B. The second finger grids 31 are electrically connected to the doped regions by firing through the passivation layer, and can collect current generated in the battery cell body 10.

[0036] As shown in FIGS. 2 to 5, the second pattern region 30 further includes current collecting segments 32 that extend in the second direction B and do not fire through the passivation layer. The current collecting segments 32 are connected to some of the second finger grids 31 and collect the current collected by these parts of the second finger grids 31. There are also gaps between the current collecting segments 32 and other parts of the second finger grids 31, which prevents short circuits in the solar cell. In other words, the other parts of the second finger grids 31 are in a disconnected state at the positions where the current collecting segments 32 are present.

[0037] It should be noted that the second finger grid 31 includes positive electrode second finger grids and negative electrode second finger grids arranged alternately in the second direction B. In the embodiment of the present application, there are multiple current collecting segments 32, and the multiple current collecting segments 32 all extend in the second direction B and are arranged at intervals in the first direction A. When one current collecting segment 32 is connected to the positive electrode second finger grid, there is a gap between the current collecting segment 32 and the negative electrode second finger grid, i.e., the negative electrode second finger grid is in a disconnected state at the location of the current collecting segment 32. Another current collecting segment 32 adjacent to the current collecting segment 32 is connected to the negative electrode second finger grid and may have a gap between it and the positive electrode second finger grid, i.e., the positive electrode second finger grid is in a disconnected state at the location of the current collecting segment 32. In this way, the multiple current collecting segments 32 collect the current collected by the positive electrode second finger grid and the negative electrode second finger grid.

[0038] Optionally, as shown in Figures 2 and 5, the current collecting segment 32 includes a current collecting point 321 and an end line 322 connected to the current collecting point 321, the end line 322 being located at a position in the second pattern area 30 away from the first pattern area 20, and the plurality of second finger grids 31 include a plurality of third sub-finger grids 311 and a plurality of fourth sub-finger grids 312 arranged alternately in the second direction B, the plurality of third sub-finger grids 311 being connected to the current collecting point 321 and / or the end line 322, and the plurality of fourth sub-finger grids 312 having a gap between them and the current collecting point 321 or the end line 322.

[0039] 2 and 5, the current collecting segment 32 includes a current collecting point 321 and an end wire 322 connected to the current collecting point 321, and the current collecting point 321 and the end wire 322 are arranged in the second direction B. In the second direction B, the current collecting point 321 is located in a region of the second pattern region 30 close to the first pattern region 20, and the end wire 322 is located in a region of the second pattern region 30 away from the first pattern region 20.

[0040] The plurality of second finger-grids 31 include third sub-finger-grids 311 and fourth sub-finger-grids 312 alternately arranged in the second direction B. Here, the third sub-finger-grids 311 and the fourth sub-finger-grids 312 have opposite polarities. It can be understood that when the third sub-finger-grid 311 is a positive second finger-grid, the fourth sub-finger-grid 312 is a negative second finger-grid, and when the third sub-finger-grid 311 is a negative second finger-grid, the fourth sub-finger-grid 312 is a positive second finger-grid.

[0041] 2 to 5, the plurality of third sub-finger grids 311 are connected to current collection points 321 and / or edge wires 322, so that the current collected by the plurality of third sub-finger grids 311 is collected by the current collection points 321 and edge wires 322. The plurality of fourth sub-finger grids 312 have gaps between the current collection points 321 and edge wires 322, that is, the plurality of fourth sub-finger grids 312 are in a disconnected state at the positions where the current collection points 321 and edge wires 322 are present, so that a short circuit phenomenon of the solar cell is avoided.

[0042] Optionally, as shown in FIG. 5 , the plurality of second finger-grids 31 include a plurality of third sub-finger-grids 311 (which may be, for example, positive electrode second finger-grids) and a plurality of fourth sub-finger-grids 312 (which may be, for example, negative electrode second finger-grids) alternately arranged in the second direction B, and the plurality of third sub-finger-grids 311 are connected to the current collecting segments 32, and the plurality of fourth sub-finger-grids 312 have gaps between them. Between the fourth sub-finger grids 312 located on both sides of the current collecting segment 32, there are first gaps, second gaps, and third gaps arranged in a first direction A, and in a second direction B, the first gaps, second gaps, and third gaps are gradually separated from the first pattern region 20, and in 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, and d1, d2, and d3 satisfy d1>d2>d3>0 or d1>d2=d3>0.

[0043] By arranging the current collecting segments 32 as described above, the current collecting segments 32 can be made wider at the positions where they are directly and electrically connected to the electrical connection members 50, preventing excessive current from collecting. By narrowing the current collecting segments 32 that are relatively far from the positions where they are electrically connected to the electrical connection members 50, the amount of material used for the current collecting segments 32 can be reduced, the length of the second finger grids 31 can be ensured to be longer, and the photoelectric conversion efficiency of the solar cell can be further improved.

[0044] By providing the fourth sub-finger grids 312 as described above, the current generated in the battery cell body 10 can be more efficiently collected by the fourth sub-finger grids 312, improving the photoelectric conversion efficiency of the solar cell. Furthermore, the risk of short-circuiting the solar cell can be avoided.

[0045] Optionally, as shown in FIG. 5, the current collecting segment 32 includes a current collecting point 321 and an end wire 322 connected to the current collecting point 321, the end wire 322 being connected to the side of the current collecting point 321 away from the first pattern area 20, the current collecting point 321 passing through the first gap, and the end wire 322 passing through the second gap and the third gap.

[0046] 5 , the current collecting segment 32 includes a current collecting point 321 and an end wire 322 connected to the current collecting point 321, and the current collecting point 321 and the end wire 322 are arranged in the second direction B. In the second direction B, the current collecting point 321 is located on a side of the second pattern region 30 closer to the first pattern region 20, and the end wire 322 is located on a side of the second pattern region 30 farther from the first pattern region 20.

[0047] By arranging the current collecting point 321 to pass through the first gap and the end wire 322 to pass through the second and third gaps, a larger width is provided between the current collecting point 321 and a portion of the fourth sub-finger grid 312, preventing excessive current collection. Since the distance between the end wire 322 and a portion of the fourth sub-finger grid 312 is small, the amount of material used for the end wire 322 is reduced and the length of the second finger grid 31 is ensured to be longer, further improving the photoelectric conversion efficiency of the solar cell.

[0048] Optionally, as shown in Figures 19 to 22, the solar cell disclosed in the examples of the present application further includes an insulating layer 40 including a plurality of insulating strips 41 extending in a first direction A and arranged at intervals in a second direction B, each insulating strip 41 covering a portion of one first connection segment 211 located between two adjacent second connection segments 212.

[0049] 19 to 22, the insulating layer 40 includes a plurality of insulating strips 41 extending in a first direction A and arranged at intervals in a second direction B. Each insulating strip 41 may have a strip-like structure extending in the first direction A, and may have, for example, a rectangular or approximately rectangular shape, an elliptical or approximately elliptical shape, a shape narrow at both ends and wide at the middle, or any other possible shape in a plan view. In the embodiment of the present application, each insulating strip 41 is positioned between two adjacent second connection segments 212 and covers the surface of one first connection segment 211 away from the battery cell body 10. This allows the insulating strip 41 to interrupt the electrical connection between the first connection segment 211 and the electrical connection member 50, thereby avoiding a short circuit in the solar cell.

[0050] It should be noted that the insulating strip 41 has insulating properties and may have a certain degree of elasticity. For example, the insulating strip 41 is an insulating adhesive. During the manufacturing process of the solar cell, the insulating adhesive is printed by screen printing on the surface of the first connection segment 211 that is away from the battery cell body 10 so as to be located between two adjacent second connection segments 212, thereby forming a layer of insulating adhesive that covers the surface of the first connection segment 211 that is away from the battery cell body 10.

[0051] Of course, the above are only some examples of specific materials and processing methods for the insulating strip 41 and are not intended to limit the present application. For practical application, engineers can determine specific materials and processing methods for the insulating strip 41 as needed. Specifically, the insulating strip 41 may be a deposited inorganic material, such as silicon nitride or silicon oxide, or an organic material, such as a resin-based material.

[0052] Optionally, as shown in FIG. 21, in the second direction B, the distance between the side edge of the second connection segment 212 closest to the adjacent insulating strip 41 and the side edge of the adjacent insulating strip 41 closest to the second connection segment 212 is d4, and d4≧40 μm is satisfied.

[0053] 21 , in the second direction B, the distance between the side edge of a second connection segment 212 closest to an adjacent insulating strip 41 and the side edge of an adjacent insulating strip 41 closest to the second connection segment 212 is d4, and d4≧40 μm is satisfied. This prevents the insulating strip 41 from shielding the second connection segment 212, affecting the reliability of the connection between the second connection segment 212 and the electrical connection member 50 and further affecting the photoelectric conversion efficiency of the solar cell. Furthermore, providing the insulating strip 41 as described above contributes to the processing of the solar cell, improving the processing efficiency and processing yield of the solar cell.

[0054] For example, in the second direction B, the distance d4 between the side edge of the second connection segment 212 close to the adjacent insulating strip 41 and the side edge of the adjacent insulating strip 41 close to the second connection segment 212 can be 40 μm, 42 μm, 45 μm, 47 μm, 50 μm, 52 μm, 55 μm, etc.

[0055] Optionally, as shown in Figures 4 and 21, in a plane on which the battery cell body 10 is located, the first connection segment 211 has a first projection, the second connection segment 212 has a second projection, the first projection is at least partially within the second projection, in the second direction B, the distance between two adjacent first sub-finger grids 214 of the same polarity is P1, and in the first direction A, the cutting distance between two first connection segments 211 connected to the same second connection segment 212 is P2, where P2≦P1 is satisfied.

[0056] As shown in Figures 4 and 21, in the plane in which the battery cell body 10 is located, the first connection segment 211 has a first projection, and the second connection segment 212 has a second projection, and the first projection is at least partially within the second projection, ensuring that at least a portion of the first connection segment 211 is connected to the second connection segment 212, thereby allowing the second connection segment 212 to collect the current collected by the first connection segment 211.

[0057] 2, the first pattern region 20 has a plurality of first sub-finger grids 214 extending in a first direction A and arranged alternately in a second direction B. The plurality of first sub-finger grids 214 includes a plurality of positive electrode first finger grids and a plurality of negative electrode first finger grids arranged alternately in the second direction B. That is, in the second direction B, the two first finger grids adjacent to each positive electrode first finger grid are negative electrode first finger grids, and the two first finger grids adjacent to each negative electrode first finger grid are positive electrode first finger grids.

[0058] 4 and 21, the distance between two adjacent first sub finger grids 214 of the same polarity in the second direction B is P1. This distance may be the distance between two adjacent positive electrode first finger grids or the distance between two adjacent negative electrode first finger grids. In the following, the relevant description will be given taking the distance between two adjacent positive electrode first finger grids as an example.

[0059] It should be noted that for two adjacent positive electrode first finger grids, the distance in the second direction B 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 edge of one second connecting segment 212 closest to the other second connecting segment 212 and the side edge of the other second connecting segment 212 closest to the second connecting segment 212. The distance may be the distance between the midpoint of one second connecting segment 212 and the midpoint of the other second connecting segment 212 in the second direction B. When the distance is the distance between two adjacent first connecting segments 211, the specific length of the distance can be calculated with reference to the shape of the second connecting segment 212, and a detailed description thereof will be omitted here.

[0060] As shown in FIGS. 4 and 21, by making the distance P1 between two adjacent first finger grids 21 with the same polarity in the second direction B greater than or equal to the cutting distance P2 between two first connection segments 211 connected to the same second connection segment 212 in the first direction A, in the second direction B, the current generated in the regions located on both sides of each first finger grid 21 in the battery cell body 10 can be more preferably collected, improving the photoelectric conversion efficiency of the solar cell.

[0061] Furthermore, from the perspective of the collection distance, P1 in the embodiments of the present application represents the preferred collection distance in the second direction B, and P2 represents the preferred collection distance in the first direction A. By making P2 less than or equal to P1, it is ensured that the ends of the first finger grids 21 located on both sides of P2 can collect the current in the covering region of the second connection segment 212.

[0062] Optionally, in the first direction A, the length of the second connection segment 212 is P3, satisfying P2 < P3, and / or P2 > 0 mm, and 0.5 mm ≤ P1 ≤ 1.5 mm. In the embodiment of FIG. 4, by making P2 less than or equal to P1 and making P2 greater than 0 mm, for example, making P2 0.2 - 1.2 mm, the paste consumption of the first connection segment 211 can be effectively reduced, and the collection efficiency in the lateral direction (the extending direction of the first finger grid 21) and the longitudinal direction (the direction perpendicular to the extending direction of the first finger grid 21) of the carriers can be guaranteed simultaneously.

[0063] In the embodiments of the present application, in the first direction A, by making the cutting distance P2 between two first connection segments 211 connected to the same second connection segment 212 smaller than the length P3 of the second connection segment 212, at least a part of the first connection segment 211 is provided within the region where the second connection segment 212 is located. The first connection segment 211 fires through the passivation layer in the region where the second connection segment 212 is located, collecting the current generated in the corresponding doped region in the region where the second connection segment 212 is located, and further improving the photoelectric conversion efficiency of the solar cell.

[0064] In the embodiment of the present application, the cutting distance P2 between two first connection segments 211 connected to the same second connection segment 212 in the first direction A is set to 0 mm or more. For example, the cutting distance P2 between two first connection segments 211 connected to the same second connection segment 212 in the first direction A can be set to 0 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, etc.

[0065] In an embodiment of the present application, the distance P1 between two adjacent first finger grids 21 of the same polarity in the second direction B is set to be 0.5 mm or more and 1.5 mm or less. For example, the distance P1 between two adjacent first finger grids 21 of the same polarity in the second direction B can be set to 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, etc.

[0066] Of course, the above are only some examples of the specific lengths of P1 and P2 in the embodiments of the present application, and are not intended to limit the present application. In actual application, engineers can set specific lengths of P1 and P2 as needed, as long as P2≦P1 is satisfied.

[0067] As an optional example, as shown in Figures 6 to 18, the solar cell of this example has a first surface (which may be, for example, a non-light-receiving surface or a back surface) and a second surface (which may be, for example, a light-receiving surface or a front surface) arranged opposite to each other, and includes a battery cell body 10 including a substrate 11, a doped region 12, and a passivation layer 14 stacked sequentially in a direction from the second surface to the first surface, a first pattern area 20 provided on the first surface and including a first finger grid 21 including a first sub-finger grid 214 and a second sub-finger grid 215 extending in a first direction A and arranged alternately in a second direction B, and a second connection segment 212 including a plurality of first connection blocks 2121 overlapping the first sub-finger grid 214 and a plurality of second connection blocks 2122 overlapping the second sub-finger grid 22. A plurality of first connection blocks 2121 are stacked on the first sub-finger grid 214, and a plurality of second connection blocks 2122 are stacked on the second sub-finger grid 215. Here, the portions of the first sub-finger grid 214 stacked on the first connection blocks 2121 pass through the passivation layer 14 and contact the doped regions 12, so that the second direction B intersects with the first direction A. The first sub-finger grid 214 and the second sub-finger grid 215 have opposite polarities. For example, if the first sub-finger grid 214 is a positive-polarity first finger grid, the second sub-finger grid 215 is a negative-polarity first finger grid, and vice versa. The doping types of the doped regions 12 below the corresponding first sub-finger grid 214 and second sub-finger grid 215 correspond to the polarities of the corresponding first sub-finger grid 214 and second sub-finger grid 215.

[0068] It should be noted that the first sub-finger grid 214 and the second sub-finger grid 215 are continuous at the locations of the first connecting block 2121 and the second connecting block 2122 stacked therewith in the first direction A, i.e., similar to the case in the embodiment of FIG. 4 where the plurality of connecting segments 211 are not disconnected at the locations of the second connecting segments 212, i.e., P2 at the locations of the second connecting segments 212 of the plurality of connecting segments 211 is 0. Optionally, the doped region 12 may be a doped region formed by in-situ doping of the substrate 11, or may be a separate layer formed on the back surface of the substrate 11 by means of deposition or the like, such as a polycrystalline silicon layer. If the doped region 12 is a separate layer, an oxide layer 13 may further be provided between the doped region 12 and the substrate 11, and the oxide layer 13 may be silicon oxide. The passivation layer 14 may be a single-layer or multi-layer structure of at least one dielectric layer such as silicon nitride, silicon oxide, aluminum oxide, or silicon oxynitride.

[0069] In an alternative embodiment, a plurality of first connection blocks 2121 and second connection blocks 2122 are arranged in an array, aligned in rows in a first direction A and aligned in columns in a second direction B. In the first direction A, multiple rows of first connection blocks 2121 and multiple rows of second connection blocks 2122 are arranged alternately and at intervals, and in the second direction B, multiple columns of first connection blocks 2121 and multiple columns of second connection blocks 2122 are arranged alternately and at intervals.

[0070] In some embodiments, the first connecting block 2121 and the second connecting block 2122 are both made of non-fire-through paste and are conductive. For example, the first connecting block 2121 and the second connecting block 2122 can be made of non-fire-through silver paste, non-fire-through copper paste, or other conductive non-fire-through metal materials. Of course, in the embodiments of the present application, the specific materials of the first connecting block 2121 and the second connecting block 2122 are not particularly limited and can be selected by those skilled in the art according to actual needs.

[0071] Optionally, the metal material of the first connecting block 2121 and the second connecting block 2122 may be the same as the metal material of the first sub-finger grid 214 and the second sub-finger grid 215, and may both be at least one of silver and copper, for example.

[0072] In the embodiment of the present application, a plurality of first connection blocks 2121 are stacked on the first sub-finger grid 214, and the portion of the first sub-finger grid 214 stacked on the first connection block 2121 passes through the passivation layer 14 to contact the doped region 12. The first connection blocks 2121 protect the portion of the first sub-finger grid 214 stacked on the first connection block 2121, thereby reducing the degree of thermal influence on the first sub-finger grid 214 when the first electrical connection member 51 is soldered to the first sub-finger grid 214, preventing the first sub-finger grid 214 from passing through the doped region 12 to reach the substrate 11 and damaging it, and ensuring the photoelectric conversion efficiency of the solar module.

[0073] In the embodiment of the present application, the first sub-finger grid 214 can be made of a fire-through metal paste and is conductive. The first sub-finger grid 214 can fire through the passivation layer 14 to directly contact the doped region 12 to form a metal silicide. The metal silicide allows the first sub-finger grid 214 to make ohmic contact with the doped region 12 and collect current generated in the substrate 11. For example, the first sub-finger grid 214 can be made of a fire-through silver paste or a fire-through copper paste.

[0074] It should be noted that in the embodiment of the present application, a plurality of second connection blocks 2122 are stacked with the second sub-finger grid 215, and the portion of the second sub-finger grid 215 stacked with the second connection blocks 2122 can also pass through the passivation layer 14 and contact the doped region 12. The second connection blocks 2122 protect the portion of the second sub-finger grid 215 stacked with the second connection blocks 2122, thereby reducing the degree of thermal influence on the second sub-finger grid 215 when the second electrical connection member 52 is soldered to the second sub-finger grid 215, preventing the second sub-finger grid 215 from passing through the doped region 12 to reach the substrate 11 and damaging it, and ensuring the photoelectric conversion efficiency of the solar module.

[0075] In the embodiment of the present application, the second sub-finger grid 215 can also be made of a fire-through metal paste and is conductive. The second sub-finger grid 215 can fire through the passivation layer 14 to directly contact the doped region 12 and form a metal silicide. The metal silicide allows the second sub-finger grid 215 to make ohmic contact with the doped region 12 and collect current generated in the substrate 11. For example, the second sub-finger grid 215 can be made of a fire-through silver paste or a fire-through copper paste.

[0076] Optionally, the first connection block 2121 in the embodiment of the present application is provided in the passivation layer 14 without passing through the passivation layer 14 .

[0077] In the embodiment of the present application, the first connecting block 2121 is disposed on the passivation layer 14 without passing through the passivation layer 14, and the first connecting block 2121 protects the portion of the first sub-finger grid 214 stacked with the first connecting block 2121. This reduces the degree of thermal influence on the first sub-finger grid 214 when the first electrical connecting member 51 is soldered to the first sub-finger grid 214, and prevents the first sub-finger grid 214 from passing through the doped region 12 to reach the substrate 11 and damaging it, thereby ensuring the photoelectric conversion efficiency of the solar module.

[0078] It can be understood that the first connection block 2121 in the embodiment of the present application can be made of a non-fire-through metal paste.

[0079] Optionally, as shown in Figures 6 to 9, in an embodiment of the present application, in the second direction B, a plurality of first connection blocks 2121 are arranged at intervals, a plurality of second connection blocks 2122 are arranged at intervals, and the second connection blocks 2122 and the first connection blocks 2121 are arranged alternately.

[0080] 6 to 9, the first sub-finger grids 214 and the second sub-finger grids 215 in the embodiment of the present application all extend in a first direction A and are arranged alternately in a second direction B. In the second direction B, the multiple first connection blocks 2121 are spaced apart, and each first connection block 2121 is stacked with one first sub-finger grid 214. During the solar module manufacturing process, the first electrical connection member 51 extends in the second direction B and covers the multiple first connection blocks 2121, which protects the portion of the first sub-finger grid 214 stacked with the first connection block 2121 by the multiple first connection blocks 2121. This reduces the degree of thermal impact on the first sub-finger grid 214 when the first electrical connection member 51 is soldered to the first sub-finger grid 214, prevents the first sub-finger grid 214 from passing through the doped region 12 to reach the substrate 11 and damaging it, and ensures the photoelectric conversion efficiency of the solar module.

[0081] The second connection blocks 2122 are spaced apart in the second direction B, and each second connection block 2122 is stacked with one second sub-finger grid 215. During the solar module fabrication process, the second electrical connection members 52 extend in the second direction B and cover the second connection blocks 2122, thereby protecting the portions of the second sub-finger grids 215 that are stacked with the second connection blocks 2122. This reduces the degree of heat influence on the second sub-finger grids 215 when the second electrical connection members 52 are soldered to the second sub-finger grids 215, preventing the second sub-finger grids 215 from passing through the doped regions 12 and reaching the substrate 11 to damage the substrate 11, and ensuring the photoelectric conversion efficiency of the solar module.

[0082] In the solar module manufacturing process, the first electrical connecting member 51 and the second electrical connecting member 52 both extend in the second direction B and are arranged alternately in the first direction A. Therefore, in the embodiment of the present application, the second connecting block 2122 and the first connecting block 2121 are arranged alternately and offset in the second direction B, so that the first connecting block 2121 is arranged to correspond to the first electrical connecting member 51, and the second connecting block 2122 is arranged to correspond to the second electrical connecting member 52.

[0083] Optionally, as shown in FIGS. 12 and 13, the first connecting block 2121 is stacked with the first sub-finger grid 214 in the direction from the second surface to the first surface.

[0084] 12 and 13, the first connection block 2121 may be stacked on the first sub-finger-grid 214 in the direction from the second surface to the first surface. In this way, the first connection block 2121 protects the portion of the first sub-finger-grid 214 that is stacked on the first connection block 2121. This reduces the degree of thermal influence on the first sub-finger-grid 214, preventing the first sub-finger-grid 214 from passing through the doped region 12 and reaching the substrate 11 and damaging it, thereby ensuring the photoelectric conversion efficiency of the solar module.

[0085] It should be noted that in the embodiments of the present application, the second connecting block 2122 may be stacked with the second sub-finger grid 215, and in this way, the second connecting block 2122 protects the part of the second sub-finger grid 215 that is stacked with the second connecting block 2122, thereby reducing the degree of thermal influence suffered by the second sub-finger grid 215 and preventing the second sub-finger grid 215 from passing through the doped region 12 to reach the substrate 11 and damaging the substrate 11, thereby ensuring the photoelectric conversion efficiency of the solar module.

[0086] 10, it should be noted that in this embodiment, the portion stacked with the first connecting block 2121 of the first sub-finger grid 214 is continuous and not cut, i.e., P2 = 0. The portion stacked with the second connecting block 2122 of the second sub-finger grid 215 is continuous and not cut.

[0087] Optionally, as shown in Figures 14 and 15, the first sub-finger grid 214 is stacked with the first connection block 2121 in the direction from the second surface to the first surface, and the portion of the first sub-finger grid 214 stacked with the first connection block 2121 passes through the first connection block 2121 and the passivation layer 14 and contacts the doped region 12.

[0088] 14 and 15, the first sub-finger grid 214 is stacked with the first connection block 2121 in the direction from the second surface to the first surface. For example, the first sub-finger grid 214 is made of a fire-through paste, and the first connection block 2121 is made of a non-fire-through material.

[0089] During the solar module fabrication process, the first sub-finger-grid 214 can fire through the first connecting block 2121 and the passivation layer 14 to electrically connect to the doped region 12 and collect the current generated in the battery cell body 10. Furthermore, in the embodiment of the present application, by providing the first connecting block 2121 between the first sub-finger-grid 214 and the passivation layer 14, the depth of the first sub-finger-grid 214 into the doped region 12 after firing is smaller than the depth of the first sub-finger-grid 214 located directly on the passivation layer 14 after firing into the doped region 12, thereby preventing the first sub-finger-grid 214 from passing through the doped region 12 to reach the substrate 11 and damaging it, and ensuring the photoelectric conversion efficiency of the solar module.

[0090] As an optional embodiment, in the examples of the present application, the second sub-finger grid 215 may be stacked with the second connection block 2122 in the direction from the second surface to the first surface, and the portion of the second sub-finger grid 215 stacked with the second connection block 2122 passes through the second connection block 2122 and the passivation layer 14 to contact the doped region 12.

[0091] In the embodiment of the present application, the second sub-finger grid 215 is stacked with the second connection block 2122 in the direction from the second surface to the first surface. For example, the second sub-finger grid 215 is made of a fire-through paste, and the second connection block 2122 is made of a non-fire-through material.

[0092] During the solar module fabrication process, the second sub-finger-grid 215 can fire through the second connection block 2122 and the passivation layer 14 to electrically connect to the doped region 12 and collect the current generated in the battery cell body 10. Furthermore, in the embodiment of the present application, by providing the second connection block 2122 between the second sub-finger-grid 215 and the passivation layer 14, the depth of the second sub-finger-grid 215 into the doped region 12 after firing is smaller than the depth of the second sub-finger-grid 215 located directly on the passivation layer 14 after firing. This prevents the second sub-finger-grid 215 from passing through the doped region 12 to reach the substrate 11 and damaging it, thereby ensuring the photoelectric conversion efficiency of the solar module.

[0093] Optionally, the first sub-finger grid 214 in the embodiment of the present application all passes through the passivation layer 14 and is at least partially embedded in the doped region 12. The portion of the first sub-finger grid 214 stacked with the first connection block 2121 is embedded in the doped region 12 to a smaller depth than the other portions of the first sub-finger grid 214.

[0094] In the embodiment of the present application, the first sub-finger grid 214 is fabricated from a fire-through metallic material, which allows the first sub-finger grid 214 to pass through the passivation layer 14 and be at least partially embedded in the doped region 12.

[0095] In the embodiment of the present application, the depth to which the portion of the first sub-finger-grid 214 stacked on the first connection block 2121 is embedded in the doped region 12 is made smaller than the depth to which the remaining portions of the first sub-finger-grid 214 are embedded in the doped region 12, thereby preventing the portion of the first sub-finger-grid 214 stacked on the first connection block 2121 from passing through the doped region 12 and reaching the substrate 11, damaging the substrate 11 and affecting the photoelectric conversion efficiency of the solar module. In other words, by configuring it as described above, the photoelectric conversion efficiency of the solar module can be ensured.

[0096] 7 and 8, the first sub-finger grid 214 in the embodiment of the present application includes a plurality of first finger grid segments 2141 spaced apart in a first direction A, with a first cutout 2142 between two adjacent first finger grid segments 2141, and each first cutout 2142 facing one second connection block 2122 in the second direction B. The second sub-finger grid 215 includes a plurality of second finger grid segments 2151 spaced apart in the first direction A, with a second cutout 2152 between two adjacent second finger grid segments 2151, and each second cutout 2152 facing one first connection block 2121 in the second direction B.

[0097] 7 and 8, the first sub-finger-grid 214 in the embodiment of the present application includes a plurality of first finger-grid segments 2141 spaced apart in a first direction A. A first cutout 2142 is provided between two adjacent first finger-grid segments 2141, and no second connection segment 212 is provided at the position of the first cutout 2142, which is different from the embodiment of FIG. 4. Furthermore, each first cutout 2142 faces one second connection block 2122 in a second direction B. During the solar module fabrication process, the second electrical connection member 52 must be bonded to the second connection block 2122. By aligning the first cutout 2142 and the second connection block 2122 in the second direction B, it is possible to prevent the second electrical connection member 52 from connecting to the first sub-finger-grid 214 and causing a short circuit in the solar module.

[0098] 7 and 8, the second sub-finger-grid 215 in this embodiment includes a plurality of second finger-grid segments 2151 spaced apart in the first direction A. A second cutout 2152 is provided between two adjacent second finger-grid segments 2151, and no second connection segment 212 is provided at the position of the second cutout 2152, which is different from the embodiment in FIG. 4. Furthermore, each second cutout 2152 faces one first connection block 2121 in the second direction B. During the solar module fabrication process, the first electrical connection member 51 must be bonded to the first connection block 2121. By aligning the second cutout 2152 and the first connection block 2121 in the second direction B, it is possible to prevent the first electrical connection member 51 from being connected to the second sub-finger-grid 215 and causing a short circuit in the solar module.

[0099] Optionally, the length of the first connecting block 2121 and / or the second connecting block 2122 is 0.3 mm or more and 0.9 mm or less, preferably 0.3 mm or more and 0.9 mm or less, in the first direction A. The second connecting segment 212 includes the first connecting block 2121 and the second connecting block 2122, and the shapes of the first connecting block 2121 and the second connecting block 2122 refer to the second connecting segment 212.

[0100] In the embodiment of the present application, the length of the first connection block 2121 in the first direction A is set to be between 0.3 mm and 1.5 mm inclusive, which prevents the length of the first connection block 2121 in the first direction A from being greater than the width of the first electrical connection member 51, thereby preventing the first electrical connection member 51 from having too much thermal influence on the first sub-finger grid 214 and affecting the photoelectric conversion efficiency of the solar module.

[0101] Generally, the width of the first electrical connection member 51 in the first direction A is 0.15 mm or more and 0.6 mm or less. For example, the width of the first electrical connection member 51 in the first direction A is 0.15 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, etc. The length of the first connection block 2121 in the first direction A is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0102] In the embodiment of the present application, the length of the second connection block 2122 in the first direction A is 0.3 mm to 1.5 mm, preferably 0.3 mm to 0.9 mm, so as to avoid the length of the second connection block 2122 in the first direction A being greater than the width of the second electrical connection member 52, which would result in excessive thermal impact of the second electrical connection member 52 on the second sub-finger grid 215 and thus affect the photoelectric conversion efficiency of the solar module.

[0103] Generally, the width of the second electrical connection member 52 in the first direction A is 0.15 mm or more and 0.6 mm or less. For example, the width of the second electrical connection member 52 in the first direction A is 0.15 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, etc. The length of the second connection block 2122 in the first direction A is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0104] Optionally, as shown in FIGS. 5 to 9, in the second direction B, the width of the first connection block 2121 is greater than the width of the first sub-finger grid 214, and the width of the second connection block 2122 is greater than the width of the second sub-finger grid 215.

[0105] As shown in Figures 5 to 9, in an embodiment of the present application, the width of the first connecting block 2121 in the second direction B is made larger than the width of the first sub-finger grid 214, and the projection of the portion of the first sub-finger grid 214 stacked with the first connecting block 2121 onto the plane on which the first connecting block 2121 exists is positioned within the first connecting block 2121. This allows the first connecting block 2121 to protect the first sub-finger grid 214, reduce the degree of thermal influence on the first sub-finger grid 214, and prevent the first sub-finger grid 214 from passing through the doped region 12 to reach the substrate 11 and damaging the substrate 11, thereby ensuring the photoelectric conversion efficiency of the solar module.

[0106] In the embodiment of the present application, the width of the second connecting block 2122 in the second direction B is made larger than the width of the second sub-finger grid 215, and the projection of the part of the second sub-finger grid 215 stacked with the second connecting block 2122 onto the plane on which the second connecting block 2122 exists is located within the second connecting block 2122. This allows the second connecting block 2122 to protect the second sub-finger grid 215, reduce the degree of thermal influence on the second sub-finger grid 215, and prevent the second sub-finger grid 215 from passing through the doped region 12 to reach the substrate 11 and damaging it, thereby ensuring the photoelectric conversion efficiency of the solar module.

[0107] Optionally, in the second direction B, the width of the first sub-finger grid 214 and / or the second sub-finger grid 215 is 10 μm or more and 40 μm or less, and the width of the first connection block 2121 and / or the second connection block 2122 is 80 μm or more and 200 μm or less.

[0108] In an embodiment of the present application, the width of the first sub-finger grid 214 in the second direction B is between 10 μm and 40 μm, and the width of the first connection block 2121 is between 80 μm and 200 μm. For example, the width of the first sub-finger grid 214 in the second direction B is 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, etc. The width of the first connection block 2121 in the second direction B is 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm, etc.

[0109] In an embodiment of the present application, the width of the second sub-finger grid 215 in the second direction B is between 10 μm and 40 μm, and the width of the second connection block 2122 is between 80 μm and 200 μm. For example, the width of the second sub-finger grid 215 in the second direction B is 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, etc. The width of the second connection block 2122 in the second direction B is 80 μm, 110 μm, 130 μm, 150 μm, 170 μm, 180 μm, etc.

[0110] Optionally, the second connecting segment 212 is one of a silver layer, a copper layer, a silver alloy layer, and a copper alloy layer.

[0111] In the embodiments of the present application, the second connecting segments 212 are all electrically conductive and made of a non-fire-through metal paste. For example, the second connecting segments 212 can be made of a non-fire-through silver paste, a non-fire-through copper paste, a non-fire-through silver alloy paste, or a non-fire-through copper alloy paste.

[0112] Of course, the above are only some examples of specific materials for the second connecting segment 212 and are not intended to limit the scope of the present application. In actual applications, engineers can select other non-fire-through metal pastes as needed.

[0113] 11 , the doped regions 12 in the embodiment of the present application include first doped regions 121 and second doped regions 122 extending in a first direction A and alternately arranged in a second direction B, with a spacing region 123 between adjacent first doped regions 121 and second doped regions 122 in the second direction B. Each first sub-finger grid 214 is provided to correspond to one first doped region 121 and contacts the first doped region 121 through the passivation layer 14. Each second sub-finger grid 215 is provided to correspond to one second doped region 122 and contacts the second doped region 122 through the passivation layer 14.

[0114] 11 , the doped region 12 in the embodiment of the present application includes first doped regions 121 and second doped regions 122 extending in a first direction A and alternately arranged in a second direction B, with a spacing region 123 between adjacent first doped regions 121 and second doped regions 122. Here, the first doped region 121 is connected to one region of the substrate 11, and the second doped region 122 is connected to another region of the substrate 11, thereby collecting current generated in the substrate 11 via the first doped region 121 and the second doped region 122. It can be understood that the first doped region 121 and the second doped region 122 are electrodes of the substrate 11 and have opposite polarities.

[0115] Furthermore, a spacing region 123 is provided between the adjacent first doped region 121 and second doped region 122, which separates the first doped region 121 and the second doped region 122 through the spacing region 123, thereby preventing a short circuit from occurring in the solar module.

[0116] It should be noted that the first doped region 121 and the second doped region 122 together constitute the doped region 12. The first doped region 121 and the second doped region 12 may be doped regions formed in situ in the substrate 11, or may be separate layers formed in the substrate 11 by deposition or other means. Alternatively, one of the first doped region 121 and the second doped region 12 may be a doped region formed in situ in the substrate 11, and the other may be a separate layer formed in the substrate 11 by deposition or other means. When the first doped region 121 and / or the second doped region 122 are separate layers, an oxide layer 13 is present between them and the substrate 11.

[0117] 11 , in the embodiment of the present application, each first sub-finger grid 214 is provided corresponding to one first doped region 121 and can pass through the passivation layer 14 to contact the first doped region 121 and collect current in the first doped region 121. Each second sub-finger grid 215 is provided corresponding to one second doped region 122 and can pass through the passivation layer 14 to contact the second doped region 122 and collect current in the second doped region 122.

[0118] Optionally, as shown in Fig. 15 , a plurality of metal particles 213 are provided between the portion of the first sub-finger grid 214 stacked with the first connection block 2121 and the doped region 12. In the thickness direction of the solar cell, one end of the metal particles 213 is embedded in the first sub-finger grid 214 and the other end is embedded in the doped region 12. In other words, one end of the metal particles 213 is embedded in or connected to the first sub-finger grid 214 and the other end is embedded in the first doped region 121.

[0119] 15, in the solar module fabrication process, a plurality of metal particles 213 are provided between the first doped region 121 and the portion of the first sub-finger grid 214 where it is stacked with the first connecting block 2121, with one end of each metal particle 213 being embedded in or connected to the first sub-finger grid 214 and the other end being embedded in the first doped region 121. However, the metal particles 213 do not penetrate into the substrate 11 and therefore will not damage the substrate 11 or affect the photoelectric conversion efficiency of the solar module.

[0120] It should be noted that the material of the metal particles 213 in the embodiment of the present application is the same as the material of the first sub-finger grid 214. It should be understood that the material of the first sub-finger grid 214 aggregates and then embeds in the first doped region 121 to form the metal particles 213. For example, the metal particles 213 may be metal crystals. The metal particles 213 may further include the silicon material of the first doped region 121 and be formed as metal silicide. It should be noted that the metal particles in the embodiment of the present application may be connected to the first sub-finger grid 214 or may be separated from the first sub-finger grid 214.

[0121] As an optional embodiment, the second sub-finger grid 215 also has a plurality of metal particles between the portion stacked with the second connection block 2122 and the doped region 122. In the thickness direction of the solar cell, the metal particles may have one end embedded in or connected to the second sub-finger grid 215 and the other end embedded in the second doped region 122.

[0122] In the embodiment of the present application, during the solar module fabrication process, metal particles are also present between the second doped region 122 and the portion of the second sub-finger grid 215 that is stacked with the second connecting block 2122, with one end of the metal particles embedded in the second sub-finger grid 215 and the other end embedded in the second doped region 122. However, the metal particles do not penetrate into the substrate 11, and therefore will not damage the substrate 11 or affect the photoelectric conversion efficiency of the solar module.

[0123] It should be noted that the metal material of the metal particles in the embodiment of the present application is the same as the material of the second sub-finger grid 215. It should be understood that the material of the second sub-finger grid 215 is embedded in the second doped region 122 to form the metal particles. For example, the metal particles may be metal crystals. The metal particles may also include the silicon material of the second doped region 122 and be formed as metal silicide. It should be noted that the metal particles in the embodiment of the present application may be connected to the second sub-finger grid 215 or may be separated from the second sub-finger grid 215.

[0124] Optionally, as shown in Figure 16, the metal particles 213 do not penetrate the doped region 12 in the thickness direction of the solar cell, and / or at least an oxide layer 13 is interposed between the metal particles 213 and the substrate 11. In this case, the first doped region 121 may be a layer formed separately on the substrate 11, for example, a polycrystalline silicon layer.

[0125] As shown in FIG. 16, the metal particles 213 do not penetrate the doped region 12 in the thickness direction of the solar cell, which prevents the metal particles 213 from passing through the doped region 12 to reach the substrate 11, damaging the substrate 11 and affecting the photoelectric conversion efficiency of the solar module.

[0126] Alternatively, an oxide layer 13 is interposed between the metal particles 213 and the substrate 11 in the thickness direction of the solar cell. The thickness of the oxide layer 13 is 1 nm or more and 3 nm or less. For example, the thickness of the oxide layer 13 is 1 nm, 1.5 nm, 2 nm, 2.5 nm, 3 nm, etc.

[0127] 16, in the embodiment of the present application, one end of the metal particle 213 is embedded in the first sub-finger grid 214 and the other end is embedded in the first doped region 121, and an oxide layer 13 is interposed between the other end of the metal particle 213 and the substrate 11. In other words, since the other end of the metal particle 213 is separated from the substrate 11 by the oxide layer 13, the metal particle 213 will not damage the substrate 11 and the metal particle 213 will not affect the photoelectric conversion efficiency of the solar module.

[0128] Optionally, the first doped region 121 and / or the second doped region 122 has a thickness of 60 nm to 150 nm. Optionally, the first doped region 121 and / or the second doped region 122 may be a doped polysilicon layer.

[0129] Optionally, the thickness of the first doped region 121 is between 60 nm and 150 nm, for example, 60 nm, 80 nm, 100 nm, 120 nm, 140 nm, 150 nm, etc.

[0130] Optionally, the thickness of the second doped region 122 is between 60 nm and 150 nm, for example, 60 nm, 80 nm, 100 nm, 120 nm, 140 nm, 150 nm, etc.

[0131] Optionally, as shown in Figures 8, 9 and 17, the solar cell disclosed in the embodiments of the present application further includes a second pattern area 30 arranged on the first surface, adjacent to the first pattern area 20 in the second direction B, and positioned closer to the edge of the first surface, and the second pattern area 30 has a third sub-finger grid 311 and a fourth sub-finger grid 312 extending in the first direction A and arranged alternately in the second direction B, and the second pattern area 30 further has a current collecting segment 32 extending in the second direction B and connected to the third sub-finger grid 311 or the fourth sub-finger grid 312, arranged in the passivation layer and not in direct contact with the doped region 12.

[0132] 8, 9, and 17, the second pattern region 30 in the embodiment of the present application is also provided on the first surface of the battery cell body 10 and is provided adjacent to the first pattern region 20 in the second direction B. For example, in the second direction B, the second pattern region 30 is located in a region closer to the edge of the battery cell body 10 than the first pattern region 20.

[0133] In the embodiment of the present application, the second pattern region 30 has third sub-finger grids 311 and fourth sub-finger grids 312 extending in a first direction A and alternately arranged in a second direction B. The third sub-finger grids 311 and fourth sub-finger grids 312 pass through the passivation layer 14 and contact the doped region 12 to collect current generated in the battery cell body 10. Here, the third sub-finger grids 311 and fourth sub-finger grids 312 have opposite polarities.

[0134] 8, 9, and 17, the second pattern region 30 further includes current collecting segments 32 extending in the second direction B, disposed on the passivation layer 14, and not in direct contact with the doped region 12. The current collecting segments 32 are not in direct contact with the doped region 12 because the current collecting segments 32 are large in width and area, making it impossible to install a protective layer or the like over a large area in the first pattern region 20, and therefore the current collecting segments 32 must not fire through the passivation layer 14.

[0135] Here, the current collecting segment 32 is connected to the third sub-finger grid 311 and can collect the current collected by the third sub-finger grid 311. In addition, the gap between the current collecting segment 32 and the fourth sub-finger grid 312 prevents a short circuit from occurring in the solar cell. In other words, the fourth sub-finger grid 312 is in a disconnected state at the position where the current collecting segment 32 exists.

[0136] In the embodiment of the present application, there are a plurality of current collecting segments 32, and the plurality of current collecting segments 32 all extend in the second direction B and are arranged at intervals in the first direction A. When one current collecting segment 32 is connected to the third sub-finger grid 311, there is a gap between it and the fourth sub-finger grid 312. Another current collecting segment 32 adjacent to this current collecting segment 32 is connected to the fourth sub-finger grid 312, and there may be a gap between it and the third sub-finger grid 311. In this way, the current collected by the third sub-finger grid 311 and the fourth sub-finger grid 312 is collected by the plurality of current collecting segments 32.

[0137] In the embodiments of the present application, the current collecting segments 32 do not fire through the passivation layer 14, thereby protecting the third sub-finger grid 311 or the fourth sub-finger grid 312 and reducing the degree of thermal impact on the third sub-finger grid 311 or the fourth sub-finger grid 312 when the electrical connection member 50 is soldered to the third sub-finger grid 311 or the fourth sub-finger grid 312. This prevents the third sub-finger grid 311 or the fourth sub-finger grid 312 from passing through the doped region 12 to reach the substrate 11 and damaging it, thereby ensuring the photoelectric conversion efficiency of the solar module.

[0138] Optionally, as shown in Figures 8, 9 and 17, the current collecting segment 32 includes a current collecting point 321 and an end wire 322 connected to the current collecting point 321, with the end wire 322 connected to the side of the current collecting point 321 away from the first pattern region 20. The third sub-finger grid 311 is connected to the current collecting point 321 and the end wire 322, and there is a gap between the fourth sub-finger grid 312 and the current collecting point 321 and the end wire 322. The end wire 322 and the current collecting point 321 are all provided in the passivation layer 14 and do not directly contact the doped region 12.

[0139] 8, 9 and 17, the current collecting segment 32 in the embodiment of the present application includes a current collecting point 321 and an end wire 322 connected to the current collecting point 321, and the current collecting point 321 and the end wire 322 are arranged in the second direction B. In the second direction B, the current collecting point 321 is located on the side of the second pattern region 30 closer to the first pattern region 20, and the end wire 322 is located on the side of the second pattern region 30 away from the first pattern region 20.

[0140] In the embodiment of the present application, the third sub-finger grid 311 and the fourth sub-finger grid 312 both extend in the first direction A and are alternately arranged in the second direction B. The third sub-finger grid 311 and the fourth sub-finger grid 312 have opposite polarities. It can be understood that when the third sub-finger grid 311 is a positive grid line, the fourth sub-finger grid 312 is a negative grid line. When the third sub-finger grid 311 is a negative grid line, the fourth sub-finger grid 312 is a positive grid line.

[0141] 8, 9 and 17, the third sub-finger grid 311 is connected to the current collecting point 321 and / or the edge line 322, thereby collecting the current collected by the third sub-finger grid 311 via the current collecting point 321 and the edge line 322. There is a gap between the fourth sub-finger grid 312 and the current collecting point 321 and the edge line 322, which prevents a short circuit from occurring in the solar cell.

[0142] It should be noted that in the embodiment of the present application, both the edge wires 322 and the current collecting points 321 are disposed on the passivation layer 14 and do not directly contact the doped region 12, that is, neither the edge wires 322 nor the current collecting points 321 fire through the passivation layer 14. This allows the edge wires 322 and the current collecting points 321 to protect the third sub-finger-grid 311, reducing the degree of heat influence on the third sub-finger-grid 311 when the electrical connection member 50 is soldered to the third sub-finger-grid 311, preventing the third sub-finger-grid 311 from passing through the doped region 12 to reach the substrate 11 and damaging the substrate 11, thereby ensuring the photoelectric conversion efficiency of the solar module.

[0143] As shown in FIGS. 19 to 22, one embodiment of the present application includes a solar cell and an electrical connection member 50, the solar cell including a battery cell body 10 including a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region, and a first pattern region 20 provided on a first surface of the battery cell body 10 and having a plurality of first finger grids 21 extending in a first direction A and arranged at intervals in a second direction B, each first finger grid 21 including a plurality of first connection segments 211 arranged at intervals in the first direction A and a second connection segment 212 connected between two adjacent first connection segments 211. The present invention further discloses a solar module including: a second direction B intersecting the first direction A; a plurality of second connection segments 212 are arranged at intervals in the second direction B; at least one first connection segment 211 is provided between two adjacent second connection segments 212; the first connection segment 211 is electrically connected to the doped region by firing through the passivation layer; and the second connection segment 212 does not fire through the passivation layer; and the electrical connection member 50 extends in the second direction B, is electrically connected to the second connection segment 212, and is insulated from the first connection segment 211.

[0144] As shown in FIGS. 19 to 22, the embodiments of the present application disclose solar modules including solar cells, which are core components of the solar module and can convert solar energy into electrical energy.

[0145] It should be noted that the solar cells included in the solar modules disclosed in the examples of the present application are solar cells without main grids, and the solar cells without main grids have the same structure as the solar cells without main grids described in the above examples, and their beneficial effects are the same or similar, so detailed description will be omitted here.

[0146] The solar module disclosed in the embodiments of the present application further includes an electrical connection member 50 extending in the second direction B and electrically connected to the second connection segments 212 of the plurality of first finger-grids 21, thereby allowing the collected current of the second connection segments 212 of the plurality of first finger-grids 21 to be transmitted to an external circuit via the electrical connection member 50.

[0147] For example, the electrical connection member 50 can be electrically connected to the second connection segments 212 of the plurality of first finger-grids 21 by soldering the electrical connection member 50 to the second connection segments 212 of the plurality of first finger-grids 21. Of course, the above are only some examples of specific means for electrically connecting the electrical connection member 50 to the second connection segments 212 of the plurality of first finger-grids 21 and are not intended to limit the present application. In actual application, engineers can provide specific means for electrically connecting the electrical connection member 50 to the second connection segments 212 of the plurality of first finger-grids 21 as needed.

[0148] It should be noted that the electrical connection member 50 in the embodiment of the present application is insulated from the first connection segment 211. Specifically, an insulating layer 40 is provided between the electrical connection member 50 and the first connection segment 211, which separates the electrical connection member 50 from the first connection segment 211, thereby avoiding the short circuit phenomenon of the solar module.

[0149] Optionally, as shown in Figures 19 to 22, the electrical connection member 50 in the embodiments of the present application is insulated from the first connection segment 211 via an insulating layer 40, and the insulating layer 40 includes a plurality of insulating strips 41 arranged at intervals in the second direction B, and each insulating strip 41 is provided between one first connection segment 211 and the electrical connection member 50.

[0150] 19 to 22, the insulating layer 40 in the embodiment of the present application includes a plurality of insulating strips 41 arranged at intervals in the second direction B. By providing each insulating strip 41 between one first connection segment 211 and the corresponding electrical connection member 50, each insulating strip 41 separates the first connection segment 211 from the corresponding electrical connection member 50, thereby avoiding a short circuit phenomenon in the solar module due to an electrical connection between the first connection segment 211 and the electrical connection member 50.

[0151] Optionally, as shown in Figures 19 to 22, the solar module disclosed in the embodiments of the present application further includes a first bonding layer 60 including a plurality of first bonding portions 61 arranged at intervals in the second direction B, each first bonding portion 61 being located between one second connection segment 212 and the electrical connection member 50, and / or the height of the first bonding portion 61 in the thickness direction of the solar module is greater than the height of the insulating strip 41.

[0152] As shown in Figures 19 to 22, the solar module disclosed in the examples of the present application further includes a first bonding layer 60 including a plurality of first bonding portions 61, each of which is a strip-shaped structure extending in a first direction A, and the plurality of first bonding portions 61 are arranged at intervals in a second direction B.

[0153] In the embodiments of the present application, each first joint 61 is provided between one second connection segment 212 and the corresponding electrical connection member 50, thereby improving the reliability of the connection between the second connection segment 212 and the corresponding electrical connection member 50 by the first joint 61.

[0154] It should be noted that the first bonding layer 60 in the embodiment of the present application is conductive, and can be formed between the second connection segment 212 and the corresponding electrical connection member 50 by printing a metal paste on the surface of the second connection segment 212 away from the battery cell body 10 by means of screen printing. For example, the first bonding layer 60 can be a tin layer.

[0155] As shown in Figures 20 and 22, by making the height of the first joint 61 greater than the height of the insulating strip 41 in the thickness direction of the solar module, it is possible to avoid the insulating strip 41 being too high and stretching the electrical connection member 50, thereby affecting the reliability of the electrical connection between the first joint 61 and the electrical connection member 50.

[0156] Optionally, as shown in Figures 19 to 22, in the first direction A, the length of the insulating strip 41 is greater than the length of the first joint 61, and / or the length of the insulating strip 41 and the length of the first joint 61 are both greater than the width of the electrical connection member 50.

[0157] 19 to 22, in the embodiment of the present application, the length of the insulating strip 41 is made longer than the length of the second connection segment 212 in the first direction A. As a result, even if the electrical connection member 50 is misaligned, the insulating strip 41 still ensures the insulation reliability between the first finger grid of the opposite polarity and the electrical connection member 50, and can avoid the short circuit phenomenon of the solar module.

[0158] In the embodiment of the present application, the length of the insulating strip 41 and the length of the second connection segment 212 are both greater than the width of the electrical connection member 50 in the first direction A. First, by making the length of the second connection segment 212 greater than the width of the electrical connection member 50 in the first direction A, the electrical connection member 50 can be more reliably connected to the second connection segment 212, improving the reliability of the electrical connection between the electrical connection member 50 and the first finger grid 21 of the opposite polarity.

[0159] Optionally, the length of the insulating strip 41 in the first direction A is made longer than the length of the second connecting segment 212, thereby improving the insulation reliability between the first finger grid 21 of opposite polarity and the electrical connecting member 50 and avoiding the short circuit phenomenon of the solar module.

[0160] 24 , a first insulating strip 411 covers the first sub-finger grid 214, and a second insulating strip 412 covers the second sub-finger grid 215. The first electrical connection members 51 are provided alternately in the second direction B on the first connection block 2121 and the second insulating strip 412, thereby achieving electrical connection with the first sub-finger grid 214 and electrical insulation with the second sub-finger grid 215. Similarly, the second electrical connection members 215 are provided alternately in the second direction B on the second connection block 2122 and the first insulating strip 411, thereby achieving electrical connection with the second sub-finger grid 215 and electrical insulation with the first sub-finger grid 214.

[0161] Optionally, referring to FIG. 21, in the first direction A, the dimension of the portion of either end of the insulating strip 41 protruding from the second connection segment 212 is x (that is, when the center line of the second connection segment 212 (the center line extends in the second direction B) is divided into two parts, the difference between the length of one side of the insulating strip 41 and the length of one side of the second connection segment 212), satisfying 0.8d - 0.1 mm < x < 1.2d + 0.1 mm, where d represents the width of the electrical connection member 50 along the first direction A. By setting it in this way, it helps to compensate for the deviation of the joint of the electrical connection member due to device accuracy, etc., and effectively prevents short circuits caused by contact between the joint of the opposite polarity of the electrical connection member and the grid line.

[0162] Optionally, the dimension of the portion of either end of the insulating strip 41 protruding from the second connection segment 212 satisfies d - 0.1 mm ≤ x ≤ d + 0.1 mm. For an electrical connection member with a d range of 0.15 - 0.3 mm, for example, 0.38 mm < x < 0.82 mm. Optionally, the length of the insulating strip 41 along the first direction A is 1 - 3 mm.

[0163] Referring to FIG. 19, the width of the first insulating strip 411 along the second direction B is y, satisfying b + 65 μm ≤ y ≤ D - 55 μm, where b represents the width of the first sub-finger grid 214 along the second direction B, and D represents the distance between the joints (5) located on both sides of the first insulating strip 411 in the second direction B. Optionally, the widths of the second insulating strip 412 and the second sub-finger grid 215 also satisfy this relationship. Here, the dimension of the width of the insulating strip 41 along the second direction B is set to satisfy 0.2 mm ≤ y ≤ 0.6 mm.

[0164] In this embodiment, designing the width of the insulating strip 41 to the above dimension can compensate for the influence of the accuracy of the printing device (e.g., screen) used in the second direction B (e.g., the up-and-down direction in FIG. 19 ) on the first insulating strip 411 or the second insulating strip 412 relative to the corresponding covering first sub-finger grid 214 or second sub-finger grid 215 during the actual printing process of the first insulating strip 411 or the second insulating strip 412. Furthermore, according to the above dimension design, the width of the insulating strip 41 can complement the performance (e.g., tension of the insulating rubber in a liquid state) and manufacturing process (e.g., peeling from the screen) of the printing material (e.g., insulating rubber) of the insulating layer 40. Furthermore, setting the width of the insulating strip 41 as described above can also compensate for the thickness margin at the boundary near the edge of the insulating strip 41 in the second direction B, preventing the problem of the insulating layer 40 being too thin near the edge of the insulating strip 41 to effectively cover the first finger grid 21.

[0165] Optionally, the thickness of the insulating strip 41 in the third direction is z, where z≧h+18 μm, and h represents the thickness of the corresponding first finger grid 21 (especially the second connecting segment 212) of a single insulating strip 41. By setting it in this manner, it is possible to prevent the insulating strip 41 from being pierced and causing a short circuit. Here, z satisfies 20 μm≦z≦60 μm. Optionally, as shown in FIG. 22 , the height of the middle region of the insulating strip 41 in the second direction B is greater than the height of both side regions of the insulating strip 41.

[0166] 22 , in the embodiment of the present application, the height of the middle region of the insulating strip 41 in the second direction B is made higher than the height of the two side regions of the insulating strip 41. This arrangement prevents the contact area between the electrical connection member 50 and the insulating strip 41 from being too large, which would affect the reliability of the electrical connection between the electrical connection member 50 and the second connection segment 212.

[0167] Furthermore, by providing the insulating strips 41 as described above, the amount of insulating material used in the insulating strips 41 can be reduced while ensuring insulation, thereby reducing the cost of the solar module.

[0168] Optionally, as shown in FIG. 22 , the solar module disclosed in the embodiments of the present application further includes a second bonding layer 70 including a plurality of second bonding portions extending in a first direction A and arranged at intervals in a second direction B, each second bonding portion being provided between one insulating strip 41 and an electrical connection member 50, and / or each second bonding portion being provided between two first bonding portions 61 adjacent to each other in the second direction B.

[0169] As shown in Figure 22, the solar module disclosed in the examples of the present application further includes a second bonding layer 70 including a plurality of second bonding portions, each of which has a strip-like structure extending in a first direction A, and the plurality of second bonding portions are arranged at intervals in a second direction B.

[0170] In the embodiment of the present application, each second joint is provided between one insulating strip 41 and an electrical connection member 50, and is also provided between two adjacent first joints 61 in the second direction B.

[0171] Preferably, in the second direction B, each second joint 71 can be connected to two adjacent first joints 61, thereby further improving the reliability of the connection between the electrical connection member 50 and the second connection segment 212 and preventing the electrical connection member 50 from protruding and affecting the appearance of the solar module.

[0172] It should be noted that the second joint 71 in the embodiment of the present application is mainly a combination of organic matter and solder. Here, the organic matter mainly comes from the organic material in the first joint 61. The solder mainly comes from the solder attached to the electrical connection member 50 itself and other extended solder. The second joint 71 is mainly present in the gap between the electrical connection member 50 and the insulating strip 41.

[0173] Optionally, the solar cell disclosed in the embodiments of the present application further includes a second pattern area 30 provided on the first surface of the battery cell body 10, spaced apart from the first pattern area 20 in the second direction B, and having a current collecting segment 32, and the end of the electrical connection member 50 and the current collecting segment 32 have an overlapping area when projected onto the battery cell body 10.

[0174] In the embodiment of the present application, a second pattern region 30 is further provided on the rear surface of the battery cell body 10, and the solar cell having the second pattern region 30 in the embodiment of the present application has the same structure as the solar cell having the second pattern region 30 in the above embodiment, and its beneficial effects are the same or similar. Here, detailed description is omitted.

[0175] The solar module disclosed in the embodiments of the present application further includes an electrical connection member 50 extending in the second direction B. The electrical connection member 50 and the current collecting segment 32 have an overlapping area when projected onto the battery cell body 10. In other words, the electrical connection member 50 extends above the current collecting segment 32 and is connected to the current collecting segment 32, thereby transporting the current collected by the current collecting segment 32 to an external circuit.

[0176] For example, the current collecting segment 32 includes a current collecting point 321 and an end wire 322 connected to the current collecting point 321. The electrical connection member 50 can be electrically connected to the current collecting point 321, i.e., the electrical connection member 50 is disposed above the current collecting point 321 and connected to the current collecting point 321, and the electrical connection member 50 extends above the end wire 322 and is electrically connected to the end wire 322. This allows the current collected at the current collecting point 321 and the end wire 322 to be transported to an external circuit via the electrical connection member 50. This improves the current collection efficiency and the photoelectric conversion efficiency of the solar module.

[0177] Optionally, the ratio of the length of the overlapping region to the length of the current collecting segment 32 in the second direction B is greater than or equal to 0.1 and less than or equal to 0.5. In the embodiment of the present application, the ratio of the length of the overlapping region to the length of the current collecting segment 32 is greater than or equal to 0.1 and less than or equal to 0.5, which ensures the reliability of the electrical connection between the electrical connection member 50 and the current collecting segment 32, improves the current collection reliability, and enhances the photoelectric conversion efficiency of the solar module.

[0178] By way of example, the ratio of the length of the overlap region to the length of the current collecting segment 32 may be 0.1, 0.2, 0.3, 0.4, 0.5, etc.

[0179] Optionally, as shown in Figures 23 to 26, the solar module in some embodiments includes an electrical connection member 50 extending in the second direction B and joined to the second connection segment 212, and a solar cell in the above embodiment.

[0180] 23 to 26, the solar module disclosed in the embodiments of the present application includes the solar cell described in the above embodiments and an electrical connection member 50 extending in the second direction B and joined to the second connection segment 212. In this way, the second connection segment 212 protects the portion of the first sub-finger-grid 214 stacked with the second connection segment 212, and the second connection segment 212 protects the portion of the second sub-finger-grid 215 stacked with the second connection segment 212. This reduces the degree of thermal influence on the first sub-finger-grid 214 or the second sub-finger-grid 215 when the electrical connection member 50 is soldered to the first sub-finger-grid 214 or the second sub-finger-grid 215, preventing the first sub-finger-grid 214 or the second sub-finger-grid 215 from passing through the doped region 12 and reaching the substrate 11, damaging the substrate 11 and affecting the photoelectric conversion efficiency of the solar module.

[0181] It should be noted that the electrical connection member 50 is electrically conductive and can transport the current generated in the solar cell to an external circuit. For example, the electrical connection member 50 may be a ribbon, and the cross section of the ribbon may be circular, elliptical, rectangular, or approximately rectangular.

[0182] Optionally, as shown in Figures 23 to 26, the electrical connection member 50 in the embodiments of the present application includes a first electrical connection member 51 and a second electrical connection member 52, both of which extend in the second direction B and are arranged alternately in the first direction A, and the first electrical connection member 51 is joined to a first connection block 2121, and the second electrical connection member 52 is joined to a second connection block 2122.

[0183] 23 to 26, the first electrical connection members 51 and the second electrical connection members 52 in the embodiment of the present application all extend in the second direction B and are arranged alternately in the first direction A. The first electrical connection members 51 are joined to the first connection block 2121, and the first connection block 2121 protects the portion of the first sub-finger-grid 214 that is stacked with the first connection block 2121. This reduces the degree of thermal influence on the first sub-finger-grid 214 when the first electrical connection members 51 are soldered to the first sub-finger-grid 214, preventing the first sub-finger-grid 214 from passing through the doped region 12 and reaching the substrate 11, damaging the substrate 11 and affecting the photoelectric conversion efficiency of the solar module.

[0184] Furthermore, because the second electrical connection member 52 is joined to the second connection block 2122, the second connection block 2122 protects the portion of the second sub-finger-grid 215 stacked with the second connection block 2122. This reduces the degree of heat influence on the second sub-finger-grid 215 when the second electrical connection member 52 is soldered to the second sub-finger-grid 215, preventing the second sub-finger-grid 215 from passing through the doped region 12 and reaching the substrate 11, damaging the substrate 11 and affecting the photoelectric conversion efficiency of the solar module.

[0185] Optionally, as shown in Figures 23 to 26, a first insulating strip 411 is provided at the connection point between the first sub-finger grid 214 and the second electrical connection member 52, and a second insulating strip 412 is provided at the connection point between the second sub-finger grid 215 and the first electrical connection member 51.

[0186] As shown in Figures 23 to 26, in the embodiments of the present application, a first insulating strip 411 is provided at the connection point between the first sub-finger grid 214 and the second electrical connection member 52, and the first insulating strip 411 separates the first sub-finger grid 214 and the second electrical connection member 52, thereby preventing the first sub-finger grid 214 from being connected to the second electrical connection member 52 and causing a short circuit in the solar module.

[0187] In the embodiment of the present application, a second insulating strip 412 is provided at the connection point between the second sub-finger grid 215 and the first electrical connection member 51, and the second insulating strip 412 separates the second sub-finger grid 215 from the first electrical connection member 51, thereby preventing the second sub-finger grid 215 from being connected to the first electrical connection member 51 and causing a short circuit in the solar module.

[0188] Optionally, as shown in Figures 23 to 26, in the second direction B, the second insulating strip 412 is located between two adjacent first connection blocks 2121 and has a width that is less than or equal to the distance between two adjacent first connection blocks 2121, and in the second direction B, the first insulating strip 411 is located between two adjacent second connection blocks 2122 and has a width that is less than or equal to the distance between two adjacent second connection blocks 2122.

[0189] 23 to 26, in the embodiment of the present application, the second insulating strip 412 is located between two adjacent first connection blocks 2121 in the second direction B, and its width in the second direction B is equal to or less than the distance between two adjacent first connection blocks 2121. This prevents the provision of the second insulating strip 412 from affecting the reliability of the connection between the first sub-finger grid 214 and the first electrical connection member 51, and ensures the photoelectric conversion efficiency of the solar module.

[0190] In this embodiment of the present application, the first insulating strip 411 is located between two adjacent second connection blocks 2122 in the second direction B, and its width in the second direction B is equal to or less than the distance between two adjacent second connection blocks 2122. This prevents the provision of the first insulating strip 411 from affecting the reliability of the connection between the second sub-finger grid 215 and the second electrical connection member 52, and ensures the photoelectric conversion efficiency of the solar module.

[0191] Optionally, as shown in Figures 23 to 26, in the first direction A, the length of the first connection block 2121 is greater than the width of the first electrical connection member 51, and the length of the second connection block 2122 is greater than the width of the second electrical connection member 52.

[0192] As shown in Figures 23 to 26, in the embodiments of the present application, the length of the first connection block 2121 in the first direction A is made greater than the width of the first electrical connection member 51, thereby preventing contact between the first electrical connection member 51 and the first sub-finger grid 214 from causing the first electrical connection member 51 to have too great a thermal effect on the first sub-finger grid 214, which would affect the photoelectric conversion efficiency of the solar module.

[0193] In the embodiment of the present application, the length of the second connection block 2122 in the first direction A is made greater than the width of the second electrical connection member 52, thereby avoiding the contact between the second electrical connection member 52 and the second sub-finger grid 215 causing the second electrical connection member 52 to have too great a thermal impact on the second sub-finger grid 215, which would affect the photovoltaic conversion efficiency of the solar module.

[0194] It should be noted that each embodiment in this specification is described in a step-by-step manner, and each embodiment is described with a focus on the differences from other embodiments, but reference may be made to the same or similar parts between the embodiments.

[0195] While alternative embodiments of the present invention have been described, those skilled in the art will be able to make further changes and modifications to these embodiments upon grasping the basic inventive concept. Accordingly, the appended claims are intended to encompass all changes and modifications within the scope of the alternative embodiments and embodiments of the present invention.

[0196] Finally, it should be explained that, in this text, relational terms such as first and second are merely used to distinguish one entity from another and do not necessarily require or imply the existence of any such substantial relationship or ordering between those entities. Furthermore, the technical terms "comprise," "consist of," or any other variant thereof are intended to include a non-exclusive inclusion, whereby an article or device comprising a series of elements includes not only those elements but also other elements not expressly specified or elements inherent in such article or device. Unless otherwise specified, an element qualified by the phrase "comprises ..." does not exclude the presence of other identical elements in the article or device comprising the element.

[0197] The above has introduced in detail the technical solutions provided by the present invention, and the present specification uses specific examples to explain the principles and embodiments of the present invention. In addition, those skilled in the art may vary the specific embodiments and application scope based on the principles and realizations of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention. [Explanation of symbols]

[0198] 10 Battery cell body 11 Circuit Board 12 Doped Region 121 First doped region 122 second doped region 2 14 Passivation Layer 13 Oxide layer 123 Interval area 20 First pattern area 21 First Finger Grid 211 First connecting segment 212 Second connecting segment 213 Metal particles 214 1st Sub-Finger Grid 215 Second sub-finger grid 2121 First connection block 2122 Second Connection Block 2141 First Finger Grid Segment 2142 1st cutting section 2151 Second Finger Grid Segment 2152 2nd cutting section 30 Second pattern area 31 Second Finger Grid 311 3rd sub-finger grid 312 4th Sub-Finger Grid 32 current collecting segments 321 Collecting point 322 End line 40 insulating layer 41 Insulation Strip 411 First insulating strip 412 Second insulating strip 50 Electrical connection parts 51 First electrical connection member 52 Second electrical connection member 60 1st bonding layer 61 1st joint 70 Second bonding layer A 1st direction B Second direction 80 Positive Finger Grid 81 Negative electrode finger grid 82 Positive main grid 83 Negative main grid 84 Solder joints 85 connecting wire

Claims

1. a battery cell body including a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; a first pattern region disposed in the passivation layer and having a plurality of first finger grids extending in a first direction and spaced apart in a second direction; each of the first finger grids includes a plurality of first connection segments spaced apart in the first direction and a second connection segment connected between two adjacent first connection segments, the second direction intersecting the first direction; In the second direction, the second connection segments are arranged at intervals, and at least one first connection segment is provided between two adjacent second connection segments, the first connection segment is electrically connected to the doped region by firing through the passivation layer, and the second connection segment does not fire through the passivation layer; The solar cell is also characterized in that the width of each of the second connection segments is greater than the width of each of the first connection segments in the second direction.

2. 2. The solar cell according to claim 1, wherein the length of each of the first connection segments is greater than the length of each of the second connection segments in the first direction.

3. 2. The solar cell according to claim 1, wherein the polarity of the second connection segment is opposite to the polarity of the adjacent first connection segment in the second direction.

4. a second pattern region provided in the passivation layer and adjacent to the first pattern region in the second direction; the second pattern region has a plurality of second finger grids extending in the first direction and arranged at intervals in the second direction, and the second pattern region further has current collecting segments extending in the second direction; 2. The solar cell according to claim 1, wherein a portion of said second finger grid is connected to said current collecting segment.

5. the current collecting segment includes a current collecting point and an end wire connected to the current collecting point, the end wire being provided in a position of the second pattern region away from the first pattern region; 5. The solar cell of claim 4, wherein the second finger grids include a plurality of third sub-finger grids and a plurality of fourth sub-finger grids arranged alternately in the second direction, the third sub-finger grids being connected to the current collection points or the end lines, and the fourth sub-finger grids having gaps between them and the current collection points or the end lines.

6. the second finger-grids include a plurality of third sub-finger-grids and a plurality of fourth sub-finger-grids alternately arranged in the second direction, the third sub-finger-grids are connected to the current collecting segments, and the fourth sub-finger-grids have gaps between them; a first gap, a second gap, and a third gap are provided in the first direction between the fourth sub-finger grids located on both sides of the current collecting segment, and the first gap, the second gap, and the third gap are gradually spaced apart from the first pattern region in the second direction; In the first direction, the width of the first gap is d １ and the width of the second gap is d ２ and the width of the third gap is d ３ Let d １ , d ２ , d ３ Is d １ >d ２ >d ３ >0 or d １ >d ２ = d ３ 5. The solar cell according to claim 4, wherein:

7. the current collecting segment includes a current collecting point and an end wire connected to the current collecting point, the end wire being connected to a side of the current collecting point away from the first pattern area; 7. The solar cell according to claim 6, wherein the current collecting point passes through the first gap, and the end wire passes through the second gap and the third gap.

8. an insulating layer including a plurality of insulating strips extending in the first direction and spaced apart in the second direction; 4. The solar cell according to claim 3, wherein each of the insulating strips covers a portion of one of the first connection segments that is located between two adjacent second connection segments.

9. In the second direction, the distance between the side edge of the second connecting segment that is closest to the adjacent insulating strip and the side edge of the adjacent insulating strip that is closest to the second connecting segment is d ４ Let d ４ 9. The solar cell according to claim 8, wherein the thickness satisfies ≧40 μm.

10. In a plane on which the battery cell body is located, the first connection segment has a first projection, the second connection segment has a second projection, and the first projection is at least partially contained within the second projection; In the second direction, the distance between two adjacent first finger grids of the same polarity is P １ and the cut distance between two first connection segments connected to the same second connection segment in the first direction is P ２ And P ２ ≦P １ 4. The solar cell according to claim 3, wherein the following is satisfied:

11. In the first direction, the length of the second connecting segment is P ３ And P ２ <P ３ Fulfilling and / or P ２ >0 mm and 0.5 mm≦P １ 11. The solar cell of claim 10, wherein the thickness is ≦1.5 mm.

12. a solar cell and an electrical connection member; The solar cell includes a battery cell body including a substrate, a doped region formed on the substrate, and a passivation layer covering the doped region; a first pattern area provided on a first surface of the battery cell body, the first pattern area having a plurality of first finger grids extending in a first direction and arranged at intervals in a second direction; each of the first finger grids includes a plurality of first connection segments spaced apart in the first direction and a second connection segment connected between two adjacent first connection segments, the second direction intersecting the first direction; In the second direction, the second connection segments are arranged at intervals, and at least one first connection segment is provided between two adjacent second connection segments, the first connection segment is electrically connected to the doped region by firing through the passivation layer, and the second connection segment does not fire through the passivation layer; a solar cell characterized in that the width of each of the second connection segments is greater than the width of each of the first connection segments in the second direction; A solar module, characterized in that the electrical connection member extends in the second direction, is electrically connected to the second connection segment, and is insulated from the first connection segment.

13. the electrical connection member is insulated from the first connection segment via an insulating layer; 13. The solar module of claim 12, wherein the insulating layer includes a plurality of insulating strips arranged at intervals in the second direction, each insulating strip being provided between one of the first connection segments and the electrical connection member.

14. a first bonding layer including a plurality of first bonding portions arranged at intervals in the second direction; Each of the first joints is provided between one of the second connection segments and the electrical connection member, 14. A solar module according to claim 13, characterized in that the height of the first joint is greater than the height of the insulating strip in the thickness direction of the solar module.

15. In 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 joint are both greater than the width of the electrical connection member.

16. 14. The solar module according to claim 13, wherein in the second direction, the height of the middle region of the insulating strip is greater than the height of both side regions of the insulating strip.

17. a second bonding layer including a plurality of second bonding portions extending in the first direction and arranged at intervals in the second direction; Each of the second joints is provided between one of the insulating strips and the electrical connection member, And / or, the solar module according to claim 14, characterized in that each of the second joints is provided between two of the first joints that are provided adjacent to each other in the second direction.

18. The solar cell is a second pattern area provided on the first surface of the battery cell body, spaced apart from the first pattern area in the second direction, and having current collecting segments; 13. The solar module according to claim 12, wherein the end of the electrical connection member and the current collecting segment have an overlapping area when projected onto the battery cell body.

19. 19. The solar module according to claim 18, wherein the ratio of the length of the overlapping region to the length of the current collecting segment in the second direction is 0.1 or more and 0.5 or less.

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