Battery sheet and photovoltaic module

Abstract

The utility model discloses a battery piece and photovoltaic module, battery piece includes battery piece ontology, a plurality of grid lines and a plurality of PAD point group. The end of all first grid lines is directly connected with first edge grid line, and the end of all second grid lines is directly connected with second edge grid line. The edge PAD point group is arranged at the edge of battery piece ontology along the first direction, and the edge PAD point group includes at least one edge PAD point. The edge PAD point is only electrically connected with the adjacent plurality of first grid lines or plurality of second grid lines along the first direction. According to the battery piece of the utility model, the overall power generation efficiency and current collection efficiency of battery piece are improved. At the same time, the plurality of first grid lines or plurality of second grid lines connected with the edge PAD point extend along the first direction, which improves the arrangement regularity of grid lines and helps to ensure the photoelectric conversion rate of battery piece, thereby improving the photoelectric current of battery piece.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, and in particular to a battery cell and a photovoltaic module. Background Technology

[0002] In photovoltaic (PV) modules, solar cells utilize PN junctions to absorb photon energy from sunlight, causing electrons to transition and generate photogenerated charge carriers. The grid lines (fine grids collect the charge, main grids conduct it) efficiently, completing the conversion of light energy into electrical energy—this is the core of PV module power generation. In related technologies, the grid lines near the PAD points at the edge of the cell are designed to bend and turn around, thus wasting at least a portion of the cell's area and reducing the cell's photoelectric conversion efficiency and photocurrent generation. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a solar cell that improves the regularity of the grid line arrangement, thereby ensuring the photoelectric conversion efficiency of the solar cell and increasing the photocurrent generated by the solar cell.

[0004] A battery cell according to a first aspect of the present invention includes: a battery cell body; a plurality of grid lines, wherein the plurality of grid lines are disposed on one side surface of the battery cell body, the plurality of grid lines including a plurality of first grid lines and a plurality of second grid lines, the plurality of first grid lines and the plurality of second grid lines extending along a first direction, the plurality of first grid lines and the plurality of second grid lines being staggered along a second direction, the first direction and the second direction being perpendicular, and the polarities of the first grid lines and the second grid lines being opposite; and a plurality of edge grid lines, the plurality of edge grid lines including first edge grid lines and second edge grid lines, the first edge grid lines and the second edge grid lines being respectively disposed on the battery cell body. The two sides of the cell body along the first direction, the first edge grid line and the second edge grid line both extend along the second direction, the ends of all the first grid lines are directly connected to the first edge grid line, and the ends of all the second grid lines are directly connected to the second edge grid line; a plurality of PAD point groups, the plurality of PAD point groups including edge PAD point groups, the edge PAD point groups are disposed on the edges of the cell body along the first direction, the edge PAD point groups include at least one edge PAD point, the edge PAD point is electrically connected to the adjacent plurality of first grid lines or plurality of second grid lines only along the first direction.

[0005] According to the battery cell of this embodiment, multiple first grid lines and multiple second grid lines can converge current to corresponding edge grid lines. Simultaneously, the current from these multiple first grid lines and multiple second grid lines can be converged to the edge PAD point electrically connected to them, thereby discharging the current converged by the grid lines and improving the overall power generation efficiency and current collection efficiency of the battery cell. Furthermore, the multiple first grid lines or multiple second grid lines connected to the edge PAD point extend along a first direction, improving the regularity of the grid line arrangement and helping to ensure the photoelectric conversion efficiency of the battery cell, thereby increasing the photocurrent generated by the battery cell.

[0006] According to some embodiments of the present invention, the ends of a plurality of second grid lines or a plurality of first grid lines adjacent to the edge PAD point in the second direction extend to the vicinity of the first edge grid line or the second edge grid line.

[0007] According to some embodiments of the present invention, the edge PAD point group includes a plurality of edge PAD points, which are arranged at intervals along the second direction.

[0008] According to some embodiments of the present invention, the plurality of edge PAD points are respectively located on both sides of the battery cell body along the second direction.

[0009] According to some embodiments of the present invention, the edge PAD point group includes a first edge PAD point group and a second edge PAD point group. The first edge PAD point group and the second edge PAD point group are respectively disposed on both sides of the battery cell body along the first direction. The first edge PAD point group includes at least one first edge PAD point, and the first edge PAD point is electrically connected to a plurality of adjacent first grid lines only along the first direction. The second edge PAD point group includes at least one second edge PAD point, and the second edge PAD point is electrically connected to a plurality of adjacent second grid lines only along the first direction.

[0010] According to some embodiments of this utility model, the number of the first grid line or the second grid line connected to the edge PAD point is 3 to 5.

[0011] According to some embodiments of the present invention, the first grid line or the second grid line connected to the edge PAD point and located on the side of the corresponding edge of the battery cell body adjacent to the edge PAD point along the first direction is the outer grid line, and the first grid line or the second grid line connected to the edge PAD point and located on the side of the corresponding edge of the edge PAD point away from the battery cell body along the first direction is the inner grid line, and at least one of the outer grid lines has a width in the second direction that is greater than the width of the inner grid line in the second direction.

[0012] According to some embodiments of the present invention, the first edge grid line and the second edge grid line include a first edge grid line segment and a second edge grid line segment connected to each other along the second direction. The width of the first edge grid line segment in the first direction is greater than the width of the second edge grid line segment in the first direction. The ends of the first grid line or the second grid line connected to the edge PAD point are all connected to the first edge grid line segment.

[0013] According to some embodiments of the present invention, the maximum width of the first edge grid line segment in the first direction is W1, and the maximum width of the second edge grid line segment in the first direction is W2, wherein W2 and W1 satisfy: W2 < W1 ≤ 5W2.

[0014] According to some embodiments of the present invention, W2 further satisfies: 20μm≤W2≤200μm.

[0015] According to some embodiments of the present invention, the distance between two adjacent first grid lines is D1, and the width of the edge PAD point in the second direction is W3, wherein D1 and W3 satisfy: D1≤W3≤1.5D1; and / or the distance between two adjacent second grid lines is D2, and the width of the edge PAD point in the second direction is W3, wherein D2 and W3 satisfy: D2≤W3≤1.5D2.

[0016] According to some embodiments of the present invention, the plurality of PAD point groups further include: at least one intermediate PAD point group, the intermediate PAD point group being disposed on the side of the edge PAD point group away from the battery cell body along the first direction.

[0017] According to some embodiments of the present invention, the intermediate PAD point group includes an intermediate PAD point, and the area of ​​the edge PAD point is larger than the area of ​​the intermediate PAD point.

[0018] According to some embodiments of the present invention, a plurality of PAD point groups are arranged along the first direction, and the misalignment distance of PAD points in two adjacent PAD point groups in the second direction is D3, wherein D3 satisfies: D3≤1mm.

[0019] According to some embodiments of the present invention, the battery cell further includes: a plurality of reinforcing line groups, the plurality of reinforcing line groups including an edge reinforcing line group, the edge reinforcing line group including at least one edge reinforcing line, the edge reinforcing line being electrically connected to the first grid line, the edge reinforcing line being opposite to the edge PAD point along the second direction, and the edge reinforcing line being located on the side of the edge PAD point away from the battery cell body along the second direction.

[0020] According to some embodiments of the present invention, a plurality of PAD point groups are arranged along the first direction; the length of the edge reinforcement line in the first direction is L1, the length of the edge PAD point in the first direction is L2, and the minimum distance between the PAD points of two adjacent PAD point groups in the first direction is D4, wherein L1, L2 and D4 satisfy: L1 < L2 ≤ D4.

[0021] According to some embodiments of the present invention, the minimum distance between the edge PAD point and the corresponding edge of the battery cell body along the first direction is D5, wherein L2, D5 and D4 satisfy: L2<D5≤D4.

[0022] A photovoltaic module according to a second aspect of the present invention includes: a solar cell, wherein the solar cell is the same as that described in the first aspect of the present invention; a solder strip electrically connected to the solar cell, the solder strip being electrically connected to the solar cell via a conductive connector, the conductive connector including a first conductive connector and a second conductive connector, the first conductive connector being disposed between a PAD point of a PAD point group of the solar cell and the solder strip, the second conductive connector being disposed between a reinforcing line of a reinforcing line group of the solar cell and the solder strip, the length of the first conductive connector in the first direction being L3, the length of the second conductive connector in the first direction being L4, and the width of the solder strip in the first direction being W4, wherein L4, L3, and W4 satisfy: L4≤W4≤L3.

[0023] According to some embodiments of the present invention, the length of the edge PAD point in the first direction is L2, the minimum distance between the PAD point and the corresponding edge of the battery cell body along the first direction is D5, and the minimum distance between the PAD points of two adjacent PAD point groups in the second direction is D4. Wherein, L3, L2, D4 and D5 satisfy: L2 < 2.5L3, and / or, L2 < D5 ≤ D4.

[0024] According to some embodiments of the present invention, L3 and L2 satisfy the following condition: L3 < L2.

[0025] According to some embodiments of the present invention, the width of the first conductive connector in the second direction is W5, the width of the second conductive connector in the second direction is W6, and the width of the PAD point in the second direction is W3, wherein W6, W5, and W3 satisfy: W6 < W5 < W3, W3 < 2.5W6.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a battery cell according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of a photovoltaic module according to an embodiment of the present utility model, wherein only a portion of the solder strip is shown; Figure 3 This is a partial schematic diagram of a photovoltaic module according to an embodiment of the present utility model. Figure 4 yes Figure 3 Enlarged view of part A shown in the center circle; Figure 5 yes Figure 3 Enlarged view of section B shown in the center circle; Figure 6 yes Figure 3 Enlarged view of section C, shown in the center circle; Figure 7 yes Figure 3 Enlarged view of section D shown in the middle circle.

[0028] Figure label: 100: Battery cell; 1: Cell body; 2: Grid line; 21: First grid line; 22: Second grid line; 3: Edge grid line; 31: First edge grid line; 32: Second edge grid line; 33: First edge grid line segment; 34: Second edge grid line segment; 41: Edge PAD point; 42: First edge PAD point; 43: Second edge PAD point; 44: Middle PAD point; 51: Edge reinforcement line; 52: Middle reinforcement line; 200: Welding strip; 300: Conductive connector; 301: First conductive connector; 302: Second conductive connector; 1000: Photovoltaic modules. Detailed Implementation

[0029] The following is for reference. Figures 1-7 A battery cell 100 according to a first aspect embodiment of the present invention is described.

[0030] like Figures 1-7 As shown, the battery cell 100 according to the first aspect of this utility model includes a battery cell body 1, a plurality of grid lines 2, a plurality of edge grid lines 3, and a plurality of PAD dot groups. In the description of this utility model, "a plurality of" means two or more.

[0031] Specifically, a plurality of grid lines 2 are disposed on one side surface of the battery cell body 1. The plurality of grid lines 2 include a plurality of first grid lines 21 and a plurality of second grid lines 22. The plurality of first grid lines 21 and the plurality of second grid lines 22 extend along a first direction. The plurality of first grid lines 21 and the plurality of second grid lines 22 are arranged alternately along a second direction. The first direction and the second direction are perpendicular. The polarities of the first grid lines 21 and the second grid lines 22 are opposite.

[0032] Multiple edge grid lines 3 include a first edge grid line 31 and a second edge grid line 32. The first edge grid line 31 and the second edge grid line 32 are respectively disposed on both sides of the battery cell body 1 along the first direction. The first edge grid line 31 and the second edge grid line 32 both extend along the second direction. The ends of all the first grid lines 21 are directly connected to the first edge grid line 31, and the ends of all the second grid lines 22 are directly connected to the second edge grid line 32.

[0033] Multiple edge grid lines 3 include a first edge grid line 31 and a second edge grid line 32. The first edge grid line 31 and the second edge grid line 32 are respectively disposed on both sides of the battery cell body 1 along the first direction. The first edge grid line 31 and the second edge grid line 32 both extend along the second direction. The ends of all the first grid lines 21 are directly connected to the first edge grid line 31, and the ends of all the second grid lines 22 are directly connected to the second edge grid line 32.

[0034] The plurality of PAD point groups include an edge PAD point group, which is disposed on the edge of the battery cell body 1 along a first direction. The edge PAD point group includes at least one edge PAD point 41, and the edge PAD point 41 is electrically connected to the adjacent plurality of first grid lines 21 or plurality of second grid lines 22 only along the first direction. For example, the first direction can be a left-right direction, and the second direction can be a up-down direction.

[0035] The solar cell body 1 serves as the foundation for absorbing light energy and achieving photoelectric conversion. It absorbs light energy through the first grid line 21 and the second grid line 22, generating electron-hole pairs (photogenerated carriers) to provide the material carriers for the entire power generation process. Multiple grid lines 2 are located on one side surface of the solar cell body 1, ensuring no metal obstruction on the other side surface. This maximizes light absorption efficiency, maximizes the collection of photogenerated carriers generated by the solar cell body 1, reduces losses during current transmission, and improves conductivity. Edge grid lines 3 specifically collect current generated in the edge region of the solar cell body 1, avoiding edge current waste and further improving the overall power generation efficiency of the solar cell 100. Multiple PAD groups provide multiple interface options for connecting the solar cell 100 to external circuits, facilitating flexible wiring in different component packaging scenarios. This also reduces the risk of the entire solar cell 100 failing due to a single PAD group malfunction, enhancing the application reliability and adaptability of the solar cell 100.

[0036] Specifically, refer to Figures 1-7 Multiple first grid lines 21 and multiple second grid lines 22 extend in the left-right direction and are staggered in the up-down direction. Due to the large number of first grid lines 21 and second grid lines 22, the efficiency of grid lines 2 in collecting photogenerated carriers can be effectively improved, thereby improving the current collection effect. It can also effectively shorten the current transmission path on the surface of the cell 100, thereby reducing the series resistance during current transmission and reducing resistance loss. It can also effectively improve the regularity of grid line arrangement, thereby simplifying the processing technology and improving the processing and manufacturing efficiency.

[0037] The first grid line 21 and the second grid line 22 have opposite polarities, meaning that the first grid line 21 and the second grid line 22 are respectively connected to different polarity ends of the PN junction inside the cell body 1, thus forming grid lines 2 of different polarities. The first edge grid line 31 and the second edge grid line 32 are located on both sides of the cell body 1 in the left-right direction, and the first edge grid line 31 and the second edge grid line 32 extend in the up-down direction. This is beneficial for the first edge grid line 31 and the second edge grid line 32 to collect the current generated in the edge region of the cell body 1 in the first direction, avoiding edge current waste, thereby further improving the overall power generation efficiency of the cell 100. The first edge grid line 31 is connected to the first grid line 21, and the second edge grid line 32 is connected to the second grid line 22. This facilitates the convergence of the current collected by the first grid line 21 and the second grid line 22 to the corresponding edge grid line 3, thereby improving the current collection efficiency.

[0038] Edge PAD groups are located at the edge of the cell body 1 in the first direction, serving as an interface for connecting the cell 100 to external circuits (such as solder ribbons). The current collected by the grid lines 2 is discharged through welding (such as infrared welding or laser welding). Edge PAD groups can shorten the transmission path of charge carriers in multiple grid lines 2 at the edge, avoiding uneven current distribution caused by excessive differences in the "edge-center" transmission distance.

[0039] In the edge PAD group, the edge PAD 41 is electrically connected to the adjacent first grid lines 21 or second grid lines 22 only along a first direction. Therefore, the edge PAD 41 can concentrate the current output from the multiple first grid lines 21 or second grid lines 22 connected to it, which helps to increase the current output of the edge PAD 41. Simultaneously, the multiple first grid lines 21 or second grid lines 22 connected to the edge PAD 41 extend along the first direction, improving the regularity of the grid line arrangement and helping to ensure the photoelectric conversion efficiency of the solar cell 100, thereby increasing the photogenerated flux of the solar cell 100.

[0040] Thus, multiple first grid lines 21 and multiple second grid lines 22 can collect current to the corresponding edge grid lines 3, and the current of multiple first grid lines 21 and multiple second grid lines 22 can be collected to the edge PAD point 41 electrically connected to them, thereby exporting the current collected by the grid lines 2, thereby improving the overall power generation efficiency and current collection efficiency of the solar cell 100.

[0041] According to the embodiment of the present invention, the battery cell 100 has multiple first grid lines 21 and multiple second grid lines 22 that can collect current to the corresponding edge grid lines 3. Simultaneously, the current from the multiple first grid lines 21 and multiple second grid lines 22 can be collected along the edge PAD point 41 electrically connected to them, thereby discharging the current collected by the grid lines 2 and improving the overall power generation efficiency and current collection efficiency of the battery cell 100. Furthermore, the multiple first grid lines 21 or multiple second grid lines 22 connected to the edge PAD point 41 extend along a first direction, improving the regularity of the grid line arrangement and helping to ensure the photoelectric conversion efficiency of the battery cell 100, thereby increasing the photocurrent generated by the battery cell 100.

[0042] According to some embodiments of this utility model, refer to Figures 1-6 The ends of a plurality of second grid lines 22 or a plurality of first grid lines 21 adjacent to the edge PAD point 41 in the second direction extend to a neighboring first edge grid line 31 or second edge grid line 32. Specifically, the ends of the plurality of second grid lines 22 adjacent to the edge PAD point 41 in the second direction extend to a neighboring first edge grid line 31; or, the ends of the plurality of first grid lines 21 adjacent to the edge PAD point 41 in the second direction extend to a neighboring second edge grid line 32.

[0043] The aforementioned plurality of first grid lines 21 or plurality of second grid lines 22 adjacent to the edge PAD point 41 in the second direction extend as far as possible toward the first edge grid line 31 or the second edge grid line 32, so as to improve the photoelectric conversion efficiency of the plurality of first grid lines 21 and second grid lines 22, thereby further improving the photoelectric conversion efficiency of the solar cell 100 and increasing the photogenerated flux of the solar cell 100.

[0044] According to some other embodiments of the present invention, refer to Figures 1-6 An edge PAD group comprises multiple edge PAD points 41, which are arranged at intervals along the second direction. An edge PAD group may include two, three, or five edge PAD points 41. No specific limitation is made here.

[0045] Multiple edge PAD points 41 are spaced apart along the second direction to increase the location of the current output on the solar cell 100; at the same time, the spaced positions of multiple edge PAD points 41 help to divide the large area of ​​the solar cell body 1 into multiple small areas, and the current in each area is output from the edge PAD point 41 of that area, thereby improving the photoelectric conversion efficiency of the solar cell 100.

[0046] Furthermore, referring to Figures 1-5 Multiple edge PAD points 41 are located on both sides of the cell body 1 along the second direction. The laying path of the solder ribbon 200 needs to cover the edge area of ​​the cell 100. If there are no edge PAD points 41 at the edge, the solder ribbon 200 needs to cross the edge of the cell 100 to connect to the internal PAD points, which can easily lead to friction and stress concentration between the solder ribbon 200 and the edge of the cell 100 (especially when the module expands and contracts with temperature), causing the solder ribbon 200 to fall off or the cell 100 to crack. The cell body 1 is provided with at least one edge PAD point 41 on one side of the second direction, which can ensure the reliability of the connection between the cell body 1 and the solder ribbon 200 on both sides of the second direction. Thus, the setting of edge PAD points 41 is conducive to the "physical fixation" and "electrical connection" of the solder ribbon 200 at the edge. At the same time, the edge PAD point group can distribute the stress to the edge area of ​​the cell 100, reducing the risk of "fatigue fracture" at the connection of the solder ribbon 200.

[0047] According to some other embodiments of the present invention, referring to Figures 1-6The edge PAD group includes a first edge PAD group and a second edge PAD group. The first edge PAD group and the second edge PAD group are respectively disposed on the two sides of the battery cell body 1 along the first direction. The first edge PAD group includes at least one first edge PAD point 42. The first edge PAD point 42 is electrically connected to the adjacent plurality of first grid lines 21 only along the first direction. The second edge PAD group includes at least one second edge PAD point 43. The second edge PAD point 43 is electrically connected to the adjacent plurality of second grid lines 22 only along the first direction.

[0048] At least one first edge PAD point 42 of the first edge PAD point group can concentrate and extract the current on the plurality of first grid lines 21, and at least one second edge PAD point 43 of the second edge PAD point group can concentrate and extract the current on the plurality of second grid lines 22. Thus, by positioning the current extraction points of the plurality of first grid lines 21 and the plurality of second grid lines 22 on both sides of the first direction, the mutual interference between the first edge PAD point group and the second edge PAD point group is reduced, thereby improving the power generation gain of the solar cell 100.

[0049] According to some specific embodiments of this utility model, refer to Figures 1-6 The number of first grid lines 21 or second grid lines 22 connected to the edge PAD point 41 is 3 to 5 (including endpoint values). The number of first grid lines 21 or second grid lines 22 connected to the edge PAD point 41 can be 3, 4, or 5. No specific limitation is made here. A small number of first grid lines 21 or second grid lines 22 connected to the edge PAD point 41 is insufficient to collect enough current; however, a large number of first grid lines 21 or second grid lines 22 connected to the edge PAD point 41 is wasteful of paste. Therefore, the number of first grid lines 21 and second grid lines 22 connected to the edge PAD point 41 is reasonably increased. This helps to meet the current transmission needs of the edge PAD point 41 while avoiding excessive blocking of incident light due to the small spacing between the first grid lines 21 and second grid lines 22, thus ensuring the light absorption of the solar cell 100 at the first grid lines 21 or second grid lines 22 connected to the edge PAD point 41. Furthermore, referring to Figures 1-6 The first grid line 21 or the second grid line 22 connected to the edge PAD point 41 and located on the side of the corresponding edge of the adjacent cell body 1 along the first direction is the outer grid line 2, and the first grid line 21 or the second grid line 22 connected to the edge PAD point 41 and located on the side of the corresponding edge of the edge PAD point 41 away from the cell body 1 along the first direction is the inner grid line 2. At least one outer grid line 2 has a width in the second direction that is greater than the width of the inner grid line 2 in the second direction.

[0050] Both sides of the edge PAD point 41 in the first direction are connected to a first gate line 21 or a second gate line 22. The first gate line 21 or second gate line 22 adjacent to the corresponding edge is the outer gate line 2, and the first gate line 21 or second gate line 22 farther from the corresponding edge is the inner gate line 2. For example, three outer gate lines 2 and two inner gate lines 2 are connected to the edge PAD point 41. The width of the middle outer gate line 2 in the second direction is greater than the width of the two inner gate lines 2 in the second direction. Therefore, the side of the edge PAD point 41 adjacent to the corresponding edge needs to collect current from multiple gate lines 2, making the width of at least one outer gate line 2 larger to meet the current collection needs of the edge PAD point 41.

[0051] According to some embodiments of this utility model, refer to Figures 1-6 The first edge grid line 31 and the second edge grid line 32 include a first edge grid line segment 33 and a second edge grid line segment 34 connected to each other along the second direction. The width of the first edge grid line segment 33 in the first direction is greater than the width of the second edge grid line segment 34 in the first direction. The ends of the first grid line 21 or the second grid line 22 connected to the edge PAD point 41 are all connected to the first edge grid line segment 33.

[0052] The edge PAD point 41 is opposite to the first edge grid line segment 33. Along the second direction, the multiple first grid lines 21 and multiple second grid lines 22 located at the edge PAD point 41 and the edge of the cell body 1 can only collect current through the first edge grid line segment 33. Therefore, the first edge grid line segment 33 needs a relatively wide design. The current collected by the first edge grid line segment 33 can be conducted through the edge PAD point 41 via the first grid line 21 or the second grid line 22 connected to the edge PAD point 41.

[0053] The second edge grid segment 34 is located away from the edge of the cell body 1. The second edge grid segment 34 is mainly used to prevent the current from being conducted to the adjacent same-pole grid line 2 when the single grid line 2 is poorly welded. This can reduce the width of the second edge grid segment 34, reduce the amount of paste used, and thus improve the current transmission efficiency, resistance loss and mechanical reliability of the second edge grid segment 34.

[0054] Furthermore, referring to Figure 3 and Figure 4The maximum width of the first edge grid segment 33 in the first direction is W1, and the maximum width of the second edge grid segment 34 in the first direction is W2, wherein W2 and W1 satisfy: W2 < W1 ≤ 5W2. Therefore, the widths of the first edge grid segment 33 and the second edge grid segment 34 are reasonable, which is beneficial for meeting the current transmission requirements of the first edge grid segment 33 and the second edge grid segment 34, minimizing resistance loss, and reducing the amount of paste used, thereby reducing the manufacturing cost of the solar cell 100.

[0055] Furthermore, W2 further satisfies: 20μm≤W2≤200μm. The maximum width of the second edge gate segment 34 in the first direction is reasonable, which minimizes the amount of slurry used, while also meeting the current transmission requirements of the second edge gate segment 34, reducing resistance loss, and improving the mechanical strength of the second edge gate segment 34.

[0056] According to some other embodiments of the present invention, refer to Figure 3 , Figure 6 and Figure 7 The distance between two adjacent first grid lines 21 is D1, and the width of the edge PAD point 41 in the second direction is W3, where D1 and W3 satisfy: D1≤W3≤1.5D1; and / or the distance between two adjacent second grid lines 22 is D2, and the width of the edge PAD point 41 in the second direction is W3, where D2 and W3 satisfy: D2≤W3≤1.5D2. Therefore, the width of the edge PAD point 41 in the second direction is reasonable, reducing the risk of over-welding or insufficient welding pull at the edge PAD point 41, and also helping to avoid waste of slurry used at the edge PAD point 41.

[0057] According to some other embodiments of the present invention, referring to Figures 1-3 and combined Figure 7 The plurality of PAD point groups further includes: at least one intermediate PAD point group, which is located on the side of the edge PAD point group away from the edge of the cell body 1 along the first direction. The intermediate PAD point group is located in the middle region of the cell body 1, thereby connecting the side of the edge PAD point group away from the cell body 1 along the first direction to the solder ribbon 200 via the intermediate PAD point group. This improves the connection stability between the solder ribbon 200 and the cell 100, and facilitates the discharge of current from locations away from the edge of the cell body 1 through the intermediate PAD point group.

[0058] Furthermore, referring to Figures 1-3 and combined Figure 7The intermediate PAD group includes intermediate PAD 44, and the area of ​​the edge PAD 41 is larger than that of the intermediate PAD 44. Because the edge PAD 41 at the edge of the cell body 1 experiences greater force, its larger area helps reduce the risk of the solder ribbon 200 detaching from the cell 100 during handling, thereby improving the structural stability of the cell 100 and extending its service life.

[0059] According to some other embodiments of the present invention, referring to Figures 1-3 and combined Figure 7 Multiple PAD point groups are arranged along a first direction, and the misalignment distance between PAD points in two adjacent PAD point groups in a second direction is D3, where D3 satisfies: D3≤1mm. The aforementioned PAD points can include edge PAD points 41 and middle PAD points 44. This ensures that the PAD points in two adjacent PAD point groups are as close to the same line as possible in the second direction, thereby reducing solder ribbon waste or the risk of incomplete soldering when the solder ribbon 200 is misaligned in the second direction.

[0060] In addition, refer to Figures 1-7 The solar cell 100 further includes: a plurality of reinforcing line groups, including an edge reinforcing line group, each edge reinforcing line group including at least one edge reinforcing line 51. The edge reinforcing line 51 is electrically connected to the first grid line 21 and is positioned opposite the edge PAD point 41 along a second direction. The edge reinforcing line 51 is located on the side of the edge PAD point 41 away from the edge of the solar cell body 1 along the second direction. The edge reinforcing line 51 in the edge reinforcing line group is electrically connected to the first grid line 21 to collect the current of the first grid line 21. The edge reinforcing line 51, located on the side of the edge PAD point 41 away from the edge of the solar cell body 1 along the second direction, can collect the current of the first grid line 21 at a location on the solar cell body 1 away from the edge PAD point 41, thereby improving the efficiency of current collection and transmission.

[0061] Furthermore, referring to Figures 1-3 and combined Figure 7Multiple PAD point groups are arranged along a first direction; the length of the edge reinforcement line 51 in the first direction is L1, the width of the edge PAD point 41 in the second direction is L2, and the minimum distance between the PAD points of two adjacent PAD point groups in the second direction is D4, where L1, L2, and D4 satisfy: L1 < L2 ≤ D4. The PAD point groups are used to collect current from multiple locations and play a major role in fixing the solder strip 200, therefore requiring a large area. The edge reinforcement line 51 is mainly used to collect current from the grid line 2, making its length in the first direction relatively small, which helps reduce paste waste in the edge reinforcement line 51. The larger minimum distance between the PAD points of two adjacent PAD point groups in the first direction helps to fully utilize the function of the edge PAD point 41, avoids excessive use of silver paste, and thus helps reduce the cost of the solar cell 100.

[0062] Furthermore, referring to Figures 1-3 and combined Figure 6 The minimum distance between edge PAD point 41 and the corresponding edge of the cell body 1 along the first direction is D5, where L2, D5, and D4 satisfy: L2 < D5 ≤ D4. Edge PAD point 41 facilitates the transmission of edge current by the solder strip 200 connected to the edge of the cell body 1 in the first direction. After the minimum distance between edge PAD point 41 and the corresponding edge of the cell body 1 along the first direction is reasonably limited, the distance between edge PAD point 41 and edge grid line 3 is more reasonable, which can effectively reduce the current resistance of the corresponding edge of the cell body 1.

[0063] In addition, the reinforcing line group also includes an intermediate reinforcing line group; the intermediate reinforcing line group includes a plurality of intermediate reinforcing lines 52, which are arranged between two edge PAD points 41 along the second direction.

[0064] Reference Figures 1-7 A photovoltaic module 1000 according to a second aspect embodiment of the present invention includes: a solar cell 100, the solar cell 100 being the solar cell 100 according to the first aspect embodiment of the present invention described above; and a solder ribbon 200, the solder ribbon 200 being electrically connected to the solar cell 100.

[0065] Reference Figures 2-4The welding strip 200 is electrically connected to the battery cell 100 through a conductive connector 300. The conductive connector 300 includes a first conductive connector 301 and a second conductive connector 302. The first conductive connector 301 is located between the PAD point of the PAD point group of the battery cell 100 and the welding strip 200. The second conductive connector 302 is located between the reinforcing line of the reinforcing line group of the battery cell 100 and the welding strip 200. The length of the first conductive connector 301 in the first direction is L3, the length of the second conductive connector 302 in the first direction is L4, and the width of the welding strip 200 in the first direction is W4. Wherein, L4, L3, and W4 satisfy: L4≤W4≤L3.

[0066] The portion of the second conductive connector 302 that is wider than the welding strip 200 does not serve a welding function, resulting in waste and a risk of over-welding. Therefore, L4 is relatively small. The first conductive connector 301 at point PAD plays a major role in fixing the welding strip 200 and requires a larger area to ensure tensile strength and welding effect. Therefore, L3 is relatively large.

[0067] According to the embodiment of the present utility model, the photovoltaic module 1000 is connected to the cell 100 via the solder ribbon 200, and the current collected by the cell 100 can be discharged through the solder ribbon 200, thereby achieving the effect of effective photoelectric conversion of the photovoltaic module 1000.

[0068] Furthermore, referring to Figures 2-4 , combined Figure 7 The length of edge PAD point 41 in the first direction is L2, the minimum distance between PAD point and the corresponding edge of the battery cell body 1 along the first direction is D5, and the minimum distance between PAD points of two adjacent PAD point groups in the first direction is D4. Wherein, L3, L2, D4 and D5 satisfy: L2 < 2.5L3, and / or, L2 < D5 ≤ D4.

[0069] Therefore, the width direction of the solder ribbon 200 is opposite to the length direction of the PAD point in the first direction. By setting L2 < 2.5L3, the length of the PAD point is suitable for connection with the solder ribbon 200. The width of the PAD point meets the requirement of stable connection with the solder ribbon 200 while avoiding waste of paste, thus helping to control the cost of the photovoltaic module 1000.

[0070] By limiting L2 < D5 ≤ D4, the connection between the PAD point and the solder strip 200 is ensured, while the arrangement length of the grid line 2 on the cell 100 is also ensured, thereby helping to ensure the photoelectric conversion efficiency of the photovoltaic module 1000.

[0071] According to some specific embodiments of this utility model, L3 and L2 satisfy: L3 < L2. The portion of the first conductive connector 301 whose length in the first direction is greater than that of the PAD point does not serve a welding function, resulting in waste and a risk of over-welding. Therefore, by setting the length of the first conductive connector 301 in the first direction to be less than the length of the PAD point in the first direction (L3 < L2), the function of the first conductive connector 301 is fully utilized while avoiding waste, thus reducing the cost of the photovoltaic module 1000 and improving the connection safety of the photovoltaic module 1000.

[0072] According to some other embodiments of the present invention, refer to Figures 2-4 , combined Figure 7 The width of the first conductive connector 301 in the second direction is W5, the width of the second conductive connector 302 in the second direction is W6, and the width of the PAD point in the second direction is W3. W6, W5, and W3 satisfy the following conditions: W6 < W5 < W3, W3 < 2.5W6. The width of the PAD point in the second direction is greater than the width of the edge reinforcement line 51 in the second direction. Therefore, it is reasonable to make the width of the second conductive connector 302 in the second direction smaller than the width of the first conductive connector 301 in the second direction. This facilitates the connection between the first conductive connector 301 and the solder strip 200, and the connection between the edge reinforcement line 51 and the solder strip 200. Simultaneously, by setting W6 < W5 < W3, W3 < 2.5W6, a stable connection between the first conductive connector 301 and the second conductive connector 302 and the solder strip 200 is ensured while reducing the risk of over-soldering, thereby improving the manufacturing and operational safety of the photovoltaic module 1000.

[0073] Other configurations and operations of the battery cell 100 and photovoltaic module 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0074] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0075] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0076] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiments. Various changes, modifications, substitutions, and variations can be made to these embodiments, and the scope of this utility model is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that, include: Battery cell body (1); Multiple grid lines (2) are disposed on one side surface of the battery cell body (1). The multiple grid lines (2) include multiple first grid lines (21) and multiple second grid lines (22). The multiple first grid lines (21) and multiple second grid lines (22) extend along a first direction. The multiple first grid lines (21) and multiple second grid lines (22) are arranged alternately along a second direction. The first direction and the second direction are perpendicular. The polarities of the first grid lines (21) and the second grid lines (22) are opposite. Multiple edge grid lines (3), including a first edge grid line (31) and a second edge grid line (32), the first edge grid line (31) and the second edge grid line (32) are respectively disposed on both sides of the battery cell body (1) along the first direction, the first edge grid line (31) and the second edge grid line (32) both extend along the second direction, the ends of all the first grid lines (21) are directly connected to the first edge grid line (31), and the ends of all the second grid lines (22) are directly connected to the second edge grid line (32); Multiple PAD point groups, including edge PAD point groups, the edge PAD point groups are located on the edge of the battery cell body (1) along the first direction, the edge PAD point groups include at least one edge PAD point (41), the edge PAD point (41) is electrically connected to the adjacent multiple first grid lines (21) or multiple second grid lines (22) only along the first direction.

2. The battery cell (100) according to claim 1, characterized in that, The ends of a plurality of second grid lines (22) or a plurality of first grid lines (21) adjacent to the edge PAD point (41) in the second direction extend to the adjacent first edge grid line (31) or second edge grid line (32).

3. The battery cell (100) according to claim 1, characterized in that, The edge PAD point group includes a plurality of edge PAD points (41), which are arranged at intervals along the second direction.

4. The battery cell (100) according to claim 3, characterized in that, The plurality of edge PAD points (41) are located on both sides of the battery cell body (1) along the second direction.

5. The battery cell (100) according to claim 1, characterized in that, The edge PAD point group includes a first edge PAD point group and a second edge PAD point group. The first edge PAD point group and the second edge PAD point group are respectively disposed on both sides of the battery cell body (1) along the first direction. The first edge PAD point group includes at least one first edge PAD point (42). The first edge PAD point (42) is electrically connected to a plurality of adjacent first grid lines (21) only along the first direction. The second edge PAD point group includes at least one second edge PAD point (43). The second edge PAD point (43) is electrically connected to a plurality of adjacent second grid lines (22) only along the first direction.

6. The battery cell (100) according to claim 1, characterized in that, The number of the first grid line (21) or the second grid line (22) connected to the edge PAD point (41) is 3 to 5.

7. The battery cell (100) according to claim 6, characterized in that, The first grid line (21) or the second grid line (22) connected to the edge PAD point (41) and located on the side of the corresponding edge of the battery cell body (1) along the first direction adjacent to the edge PAD point (41) is the outer grid line (2), and the first grid line (21) or the second grid line (22) connected to the edge PAD point (41) and located on the side of the corresponding edge of the edge PAD point (41) away from the battery cell body (1) along the first direction is the inner grid line (2), and at least one of the outer grid lines (2) has a width in the second direction that is greater than the width of the inner grid line (2) in the second direction.

8. The battery cell (100) according to claim 1, characterized in that, The first edge gate line (31) and the second edge gate line (32) include a first edge gate line segment (33) and a second edge gate line segment (34) connected to each other along the second direction. The width of the first edge gate line segment (33) in the first direction is greater than the width of the second edge gate line segment (34) in the first direction. The ends of the first gate line (21) or the second gate line (22) connected to the edge PAD point (41) are all connected to the first edge gate line segment (33).

9. The battery cell (100) according to claim 8, characterized in that, The maximum width of the first edge grid line segment (33) in the first direction is W1, and the maximum width of the second edge grid line segment (34) in the first direction is W2, wherein W2 and W1 satisfy: W2 < W1 ≤ 5W2.

10. The battery cell (100) according to claim 9, characterized in that, The W2 further satisfies: 20μm≤W2≤200μm.

11. The battery cell (100) according to claim 1, characterized in that, The distance between two adjacent first grid lines (21) is D1, and the width of the edge PAD point (41) in the second direction is W3, wherein D1 and W3 satisfy: D1≤W3≤1.5D1; and / or The distance between two adjacent second grid lines (22) is D2, and the width of the edge PAD point (41) in the second direction is W3, wherein D2 and W3 satisfy: D2≤W3≤1.5D2.

12. The battery cell (100) according to claim 1, characterized in that, The plurality of said PAD point groups further include: At least one intermediate PAD group is provided on the side of the edge PAD group away from the edge of the cell body (1) along the first direction.

13. The battery cell (100) according to claim 12, characterized in that, The intermediate PAD point group includes an intermediate PAD point (44), and the area of ​​the edge PAD point (41) is larger than the area of ​​the intermediate PAD point (44).

14. The battery cell (100) according to claim 1, characterized in that, Multiple PAD point groups are arranged along the first direction, and the misalignment distance of PAD points in two adjacent PAD point groups in the second direction is D3, wherein D3 satisfies: D3≤1mm.

15. The battery cell (100) according to any one of claims 1-14, characterized in that, Further includes: Multiple reinforcing line groups, including edge reinforcing line groups, each edge reinforcing line group including at least one edge reinforcing line (51), the edge reinforcing line (51) being electrically connected to the first grid line (21), the edge reinforcing line (51) being opposite to the edge PAD point (41) along the second direction, the edge reinforcing line (51) being located on the side of the edge PAD point (41) away from the edge of the cell body (1) along the second direction.

16. The battery cell (100) according to claim 15, characterized in that, Multiple groups of PAD points are arranged along the first direction; The length of the edge reinforcement line (51) in the first direction is L1, the length of the edge PAD point (41) in the first direction is L2, and the minimum distance between the PAD points of two adjacent PAD point groups in the first direction is D4, wherein L1, L2 and D4 satisfy: L1 < L2 ≤ D4.

17. The battery cell (100) according to claim 16, characterized in that, The minimum distance between the edge PAD point (41) and the corresponding edge of the battery cell body (1) along the first direction is D5, wherein L2, D5 and D4 satisfy: L2<D5≤D4.

18. A photovoltaic module (1000), characterized in that, include: A battery cell (100), wherein the battery cell (100) is the battery cell (100) according to any one of claims 1-17. A solder strip (200) is electrically connected to the battery cell (100). The solder strip (200) is electrically connected to the battery cell (100) through a conductive connector (300). The conductive connector (300) includes a first conductive connector (301) and a second conductive connector (302). The first conductive connector (301) is disposed between the PAD point of the PAD point group of the battery cell (100) and the solder strip (200). The second conductive connector (302) is disposed between the reinforcing line of the reinforcing line group of the battery cell (100) and the solder strip (200). The length of the first conductive connector (301) in the first direction is L3, the length of the second conductive connector (302) in the first direction is L4, and the width of the solder strip (200) in the first direction is W4. Wherein, L4, L3 and W4 satisfy: L4≤W4≤L3.

19. The photovoltaic module (1000) according to claim 18, characterized in that, The length of the PAD point in the first direction is L2, the minimum distance between the PAD point and the corresponding edge of the battery cell body (1) along the first direction is D5, and the minimum distance between the PAD points of two adjacent PAD point groups in the second direction is D4. Wherein, L3, L2, D4 and D5 satisfy: L2 < 2.5L3, and / or, L2 < D5 ≤ D4.

20. The photovoltaic module (1000) according to claim 19, characterized in that, The condition L3 and L2 satisfy: L3 < L2.

21. The photovoltaic module (1000) according to claim 18 or 19, characterized in that, The width of the first conductive connector (301) in the second direction is W5, the width of the second conductive connector (302) in the second direction is W6, and the width of the PAD point in the second direction is W3, wherein W6, W5 and W3 satisfy: W6 < W5 < W3, W3 < 2.5W6.

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