Solar cell and solar module

Abstract

The utility model discloses a solar cell and a solar assembly, relates to the technical field of solar cells, and aims to solve the problem that an area between two auxiliary grids is blackened during EL test. The solar cell comprises a cell piece main body, a first surface electrode structure comprising a first end bus electrode, a second end bus electrode and a first surface collector electrode, and a second surface electrode structure comprising a third end bus electrode, a fourth end bus electrode and a second surface collector electrode. In the second end bus electrodes, the distribution density of the first surface collector electrodes is smaller than the distribution density of the first surface collector electrodes located between the two adjacent second end bus electrodes; in the third end bus electrodes, the distribution density of the second surface collector electrodes is smaller than the distribution density of the second surface collector electrodes located between every two adjacent third end bus electrodes.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a solar cell and a solar energy component. Background Art

[0002] A solar cell is a semiconductor device that can convert light energy into electrical energy. Specifically, when a solar cell is exposed to light, the semiconductor substrate included in the solar cell absorbs photons and generates electron-hole pairs. The electron-hole pairs are separated under the action of the built-in electric field of the PN junction, and are respectively led out through the emitter and back field of the solar cell, and finally collected by the electrode structure arranged on the semiconductor substrate.

[0003] The solar cell generally includes a cell body, a main grid, a fine grid and a pad. Exemplarily, the solar cell includes pads located at both ends of each main grid (referred to as end pads) and at least two auxiliary grids connected to both ends of each end pad and extending toward the edge of the cell body along a first direction, and the end pads and the at least two auxiliary grids form a harpoon structure or a U-shaped structure.

[0004] However, during the later EL test (electroluminescence) process, the area between the two auxiliary grids in the area where the above-mentioned harpoon structure or U-shaped structure is located appears black. At the same time, the fine grid in the area where the harpoon structure or U-shaped structure is located will be affected by the welding of the soldering ribbon due to the intersection with the soldering ribbon. In severe cases, it may cause damage to the fine grid and even the passivation layer. Utility Model Content

[0005] The utility model aims to provide a solar cell and a solar module, which are used to reduce the blackening of the area between two auxiliary grids and the influence of welding strip welding on the fine grids.

[0006] In order to achieve the above-mentioned purpose, in a first aspect, the utility model provides a solar cell. The solar cell comprises: a cell body. The cell body comprises a first surface and a second surface opposite to each other, and a first surface electrode structure and a second surface electrode structure formed on the first surface and the second surface respectively. Along a first direction, the cell body comprises a first edge and a second edge opposite to each other.

[0007] The first surface electrode structure includes: a first end bus electrode adjacent to the first edge and spaced along the second direction; the second direction is different from the first direction; a second end bus electrode adjacent to the second edge and spaced along the second direction; a first surface collector electrode extending along the second direction and spaced along the first direction; a first end pad located on a side of the first end bus electrode away from the first edge, and a second end pad located on a side of the second end bus electrode away from the second edge;

[0008] The second surface electrode structure includes: a third end bus electrode adjacent to the first edge and spaced apart along the second direction; a fourth end bus electrode adjacent to the second edge and spaced apart along the second direction; a second surface collector electrode extending along the second direction and spaced apart along the first direction; a third end pad located on a side of the third end bus electrode away from the first edge, and a fourth end pad located on a side of the fourth end bus electrode away from the second edge;

[0009] The first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively include two sub-bus electrodes extending along the first direction; the space between the two sub-bus electrodes of the first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively constitutes the first end bus electrode space, the second end bus electrode space, the third end bus electrode space and the fourth end bus electrode space;

[0010] Among them, in the first end bus electrode space of the first end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the first edge is equal to the distribution density of the first surface collector electrode located in the area between two adjacent first end bus electrodes; it should be noted that the above distribution density can be understood as: the number of first surface collector electrodes distributed per unit length along the first direction in the first end bus electrode space. The number of first surface collector electrodes distributed per unit length along the first direction in the area between two adjacent first end bus electrodes.

[0011] In the fourth end bus electrode space of the fourth end bus electrode, the distribution density of the second surface collector electrodes in at least a partial area adjacent to the second edge is equal to the distribution density of the second surface collector electrodes in the area between two adjacent fourth end bus electrodes; it should be noted that the above distribution density can be understood as: the number of second surface collector electrodes distributed per unit length along the first direction in the fourth end bus electrode space. The number of second surface collector electrodes distributed per unit length along the first direction in the area between two adjacent fourth end bus electrodes.

[0012] In the second end bus electrode space of the second end bus electrode, the distribution density of the first surface collector electrodes in at least a partial area adjacent to the second edge is less than the distribution density of the first surface collector electrodes in the area between two adjacent second end bus electrodes; it should be noted that the above distribution density can be understood as: the number of first surface collector electrodes distributed per unit length along the first direction in the second end bus electrode space. The number of first surface collector electrodes distributed per unit length along the first direction in the area between two adjacent second end bus electrodes.

[0013] In the third end bus electrode space of the third end bus electrode, the distribution density of the second surface collector electrodes in at least a partial area adjacent to the first edge is less than the distribution density of the second surface collector electrodes in the area between two adjacent third end bus electrodes. It should be noted that the above distribution density can be understood as: the number of second surface collector electrodes distributed per unit length along the first direction in the third end bus electrode space. The number of second surface collector electrodes distributed per unit length along the first direction in the area between two adjacent third end bus electrodes.

[0014] In summary, combined with the above description, the above distribution density can be understood as: the number of first surface collecting electrodes or the number of second surface collecting electrodes distributed per unit length along the first direction in a certain space or a certain area.

[0015] Compared with the prior art, in the solar cell provided by the utility model, according to the foregoing description, the first end bus electrode and the fourth end bus electrode can be understood as a harpoon structure or a U-shaped structure in the prior art. Furthermore, in the first end bus electrode space of the first end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the first edge is equal to the distribution density of the first surface collector electrode in the area between two adjacent first end bus electrodes. In the fourth end bus electrode space of the fourth end bus electrode, the distribution density of the second surface collector electrode in at least a partial area adjacent to the second edge is equal to the distribution density of the second surface collector electrode in the area between two adjacent fourth end bus electrodes. It should be noted that the first surface collector electrode is provided in the area between the two adjacent first end bus electrodes, and the second surface collector electrode is provided in the area between the two adjacent fourth end bus electrodes.

[0016] Since there is a first surface collector electrode in the first end bus electrode space, and there is a second surface collector electrode in the fourth end bus electrode space. That is, in the solar cell provided by the utility model, at least part of the area where the harpoon structure or the U-shaped structure is located has a fine grid. At this time, the blackening of the area between the adjacent first end bus electrode and the fourth end bus electrode can be reduced or avoided in the EL test. Furthermore, since the first surface collector electrode located in the first end bus electrode space and the second surface collector electrode located in the fourth end bus electrode space meet the above conditions, the carrier collection efficiency can be improved at this time, thereby improving the current collection capacity of the first end bus electrode and the fourth end bus electrode, and then improving the battery efficiency of the solar cell.

[0017] In one implementation, in the second end bus electrode space, a maximum distance between the first surface collector electrode and the second end pad is greater than a minimum distance between the first surface collector electrode and the second edge.

[0018] When the above technical solution is adopted, the area near the second edge in the second end bus electrode space can be effectively avoided from being damaged during welding of the welding strip. At the same time, there are enough first surface collecting electrodes in the second end bus electrode space, thereby improving the carrier collection efficiency.

[0019] In one implementation, in the third end bus electrode space, a maximum distance between the second surface collector electrode and the third end pad is greater than a minimum distance between the second surface collector electrode and the first edge.

[0020] When the above technical solution is adopted, the area near the first edge in the third end bus electrode space can be effectively avoided from being damaged during welding of the welding strip. At the same time, there are enough second surface collecting electrodes in the third end bus electrode space, thereby improving the carrier collection efficiency.

[0021] In one implementation, in the second end bus electrode space, the distribution density of the first surface collecting electrodes in at least a partial region adjacent to the second edge is greater than half the distribution density of the first surface collecting electrodes in the region between two adjacent second end bus electrodes.

[0022] When the above technical solution is adopted, the collection efficiency of carriers in the bus electrode space at the second end can be guaranteed.

[0023] In one implementation, in the third end bus electrode space, the distribution density of the second surface collecting electrodes in at least a partial region adjacent to the first edge is greater than half the distribution density of the second surface collecting electrodes in the region between two adjacent third end bus electrodes.

[0024] When the above technical solution is adopted, the collection efficiency of carriers in the third end bus electrode space can be guaranteed.

[0025] In a second aspect, the utility model further provides a solar cell. The solar cell comprises: a cell body. The cell body comprises a first surface and a second surface opposite to each other, and a first surface electrode structure and a second surface electrode structure formed on the first surface and the second surface, respectively. Along a first direction, the cell body comprises a first edge and a second edge opposite to each other, and a dividing line located between the first edge and the second edge.

[0026] The first surface electrode structure includes: a first end bus electrode adjacent to the first edge and spaced along the second direction; the second direction is different from the first direction; a second end bus electrode adjacent to the dividing line and spaced along the second direction; a first surface collector electrode extending along the second direction and spaced along the first direction; a first end pad located on a side of the first end bus electrode away from the first edge, and a second end pad located on a side of the second end bus electrode away from the dividing line;

[0027] The second surface electrode structure includes: a third end bus electrode adjacent to the first edge and spaced apart along the second direction; a fourth end bus electrode adjacent to the dividing line and spaced apart along the second direction; a second surface collector electrode extending along the second direction and spaced apart along the first direction; a third end pad located on a side of the third end bus electrode away from the first edge, and a fourth end pad located on a side of the fourth end bus electrode away from the dividing line;

[0028] The first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively include two sub-bus electrodes extending along the first direction; the space between the two sub-bus electrodes of the first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively constitutes the first end bus electrode space, the second end bus electrode space, the third end bus electrode space and the fourth end bus electrode space;

[0029] Among them, in the first end bus electrode space of the first end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the first edge is equal to the distribution density of the first surface collector electrode located in the area between two adjacent first end bus electrodes; it should be noted that the above distribution density can be understood as: the number of first surface collector electrodes distributed per unit length along the first direction in the first end bus electrode space. The number of first surface collector electrodes distributed per unit length along the first direction in the area between two adjacent first end bus electrodes.

[0030] In the fourth end bus electrode space of the fourth end bus electrode, the distribution density of the second surface collector electrodes in at least a portion of the region adjacent to the dividing line is equal to the distribution density of the second surface collector electrodes located in the region between two adjacent fourth end bus electrodes; it should be noted that the above distribution density can be understood as: the number of second surface collector electrodes distributed per unit length along the first direction in the fourth end bus electrode space. The number of second surface collector electrodes distributed per unit length along the first direction in the region between two adjacent fourth end bus electrodes.

[0031] In the second end bus electrode space of the second end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the dividing line is less than the distribution density of the first surface collector electrode in the area between two adjacent second end bus electrodes; it should be noted that the above distribution density can be understood as: the number of first surface collector electrodes distributed per unit length along the first direction in the second end bus electrode space. The number of first surface collector electrodes distributed per unit length along the first direction in the area between two adjacent second end bus electrodes.

[0032] In the third end bus electrode space of the third end bus electrode, the distribution density of the second surface collector electrodes in at least a partial area adjacent to the first edge is less than the distribution density of the second surface collector electrodes in the area between two adjacent third end bus electrodes. It should be noted that the above distribution density can be understood as: the number of second surface collector electrodes distributed per unit length along the first direction in the third end bus electrode space. The number of second surface collector electrodes distributed per unit length along the first direction in the area between two adjacent third end bus electrodes.

[0033] In summary, combined with the above description, the above distribution density can be understood as: the number of first surface collecting electrodes or the number of second surface collecting electrodes distributed per unit length along the first direction in a certain space or a certain area.

[0034] Compared with the prior art, in the solar cell provided by the utility model, according to the foregoing description, the first end bus electrode and the fourth end bus electrode can be understood as a harpoon structure or a U-shaped structure in the prior art. Furthermore, in the first end bus electrode space of the first end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the first edge is equal to the distribution density of the first surface collector electrode in the area between two adjacent first end bus electrodes. In the fourth end bus electrode space of the fourth end bus electrode, the distribution density of the second surface collector electrode in at least a partial area adjacent to the dividing line is equal to the distribution density of the second surface collector electrode in the area between two adjacent fourth end bus electrodes. It should be noted that the first surface collector electrode is provided in the area between the two adjacent first end bus electrodes, and the second surface collector electrode is provided in the area between the two adjacent fourth end bus electrodes.

[0035] Since there is a first surface collector electrode in the first end bus electrode space, and there is a second surface collector electrode in the fourth end bus electrode space. That is, in the solar cell provided by the utility model, at least part of the area where the harpoon structure or the U-shaped structure is located has a fine grid. At this time, the blackening of the area between the adjacent first end bus electrode and the fourth end bus electrode can be reduced or avoided in the EL test. Furthermore, since the first surface collector electrode located in the first end bus electrode space and the second surface collector electrode located in the fourth end bus electrode space meet the above conditions, the carrier collection efficiency can be improved at this time, thereby improving the current collection capacity of the first end bus electrode and the fourth end bus electrode, and then improving the battery efficiency of the solar cell.

[0036] In one implementation, in the second end bus electrode space, the maximum distance between the first surface collector electrode and the second end pad is greater than the minimum distance between the first surface collector electrode and the dividing line.

[0037] When the above technical solution is adopted, the area near the dividing line in the second end busbar space can be effectively avoided from being damaged during welding of the welding strip. At the same time, there are enough first surface collecting electrodes in the second end busbar space, thereby improving the carrier collection efficiency.

[0038] In one implementation, in the third end bus electrode space, a maximum distance between the second surface collector electrode and the third end pad is greater than a minimum distance between the second surface collector electrode and the first edge.

[0039] When the above technical solution is adopted, the area near the first edge in the third end bus electrode space can be effectively avoided from being damaged during welding of the welding strip. At the same time, there are enough second surface collecting electrodes in the third end bus electrode space, thereby improving the carrier collection efficiency.

[0040] In one implementation, in the second end bus electrode space, the distribution density of the first surface collecting electrodes in at least a partial region adjacent to the dividing line is greater than half the distribution density of the first surface collecting electrodes in the region between two adjacent second end bus electrodes.

[0041] When the above technical solution is adopted, the collection efficiency of carriers in the bus electrode space at the second end can be guaranteed.

[0042] In one implementation, in the third end bus electrode space, the distribution density of the second surface collecting electrodes in at least a partial region adjacent to the first edge is greater than half the distribution density of the second surface collecting electrodes in the region between two adjacent third end bus electrodes.

[0043] When the above technical solution is adopted, the collection efficiency of carriers in the third end bus electrode space can be guaranteed.

[0044] In combination with the solar cell provided in the first aspect and the second aspect, in one implementation, the second end bus electrode space includes at least one first region, a first surface collecting electrode exists in at least one first region, and the first surface collecting electrodes are uniformly distributed, and the distribution density of the first collecting electrodes in at least one first region is less than the distribution density of the first surface collecting electrodes in the region between two adjacent second end bus electrodes; and / or, the third end bus electrode space includes at least one second region, a second surface collecting electrode exists in at least one second region, and the second surface collecting electrodes are uniformly distributed, and the distribution density of the second surface collecting electrodes in at least one second region is less than the distribution density of the second surface collecting electrodes in the region between two adjacent third end bus electrodes.

[0045] In combination with the solar cell provided by the first aspect and the second aspect, in one implementation, the maximum distance between the first surface collecting electrode and the second end pad in the second end bus electrode space is smaller than the maximum distance between the second surface collecting electrode and the third end pad in the third end bus electrode space.

[0046] In a third aspect, the utility model further provides a solar module, which includes a battery string, wherein the battery string includes a plurality of conductive connectors and a plurality of solar cells as described in the first aspect arranged at intervals, and the conductive connectors connect the plurality of solar cells in series.

[0047] Among them, a plurality of spaced-apart solar cells include adjacent first and second solar cells; the conductive connector includes a first connecting segment located on a first surface of the first solar cell, a second connecting segment located on a second surface of the second solar cell, and a third connecting segment; the first connecting segment has a first end segment and a second end segment, the first end segment is welded to a first end pad of the first solar cell, and the second end segment is welded to a second end pad of the first solar cell; the second connecting segment includes a third end segment and a fourth end segment, the third end segment is welded to a third end pad of the second solar cell, and the fourth end segment is welded to a fourth end pad of the second solar cell; the second end segment and the third end segment are connected via the third connecting segment.

[0048] Compared with the prior art, in the solar module provided by the utility model, the first end section and the fourth end section are the starting point and the ending point of the conductive connector respectively, because the first end section is welded to the first end pad of the first solar cell, and the fourth end section is welded to the fourth end pad of the second solar cell. Combined with the description of the solar cell in the first aspect, it can be seen that the first surface collector electrode located in the first end busbar electrode space and the second surface collector electrode located in the fourth end busbar electrode space have a large distribution density, and the first surface collector electrode and the second surface collector electrode will not be affected by the welding of the conductive connector.

[0049] At this time, not only can the carrier collection efficiency be improved, thereby improving the current collection capacity of the first end bus electrode and the fourth end bus electrode, and thus improving the cell efficiency of the solar cell. At the same time, there is no need to worry about the damage of the first surface collector electrode and the second surface collector electrode in the first end bus space and the fourth end bus space due to the influence of the conductive connector. Therefore, the connection method provided by the embodiment of the utility model can ensure that the first surface collector electrode and the second surface collector electrode located in the first end bus electrode space and the fourth end bus electrode space and close to the first edge and the second edge are not damaged.

[0050] Furthermore, after the conductive connector is connected to the solar cell, it passes through the second end pad and the third end pad, and at this time, the conductive connector extends through the second end bus electrode space and the third end bus electrode space in its length direction. Combined with the description of the solar cell in the first aspect, it can be seen that in the second end bus electrode space of the second end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the second edge is less than the distribution density of the first surface collector electrode in the area between two adjacent second end bus electrodes. In the third end bus electrode space of the third end bus electrode, the distribution density of the second surface collector electrode in at least a partial area adjacent to the first edge is less than the distribution density of the second surface collector electrode in the area between two adjacent third end bus electrodes. It should be noted that there is a first surface collector electrode in the area between two adjacent second end bus electrodes, and there is a second surface collector electrode in the area between two adjacent third end bus electrodes.

[0051] At this time, the influence of the welding of the conductive connector on the first surface collector electrode and the second surface collector electrode in the second end bus electrode space and the third end bus electrode space can be reduced, and the number of the first surface collector electrode and the second surface collector electrode damaged can be avoided or reduced as much as possible. In particular, the first surface collector electrode and the second surface collector electrode located in the second end bus electrode space and the third end bus electrode space and close to the first edge and the second edge are subjected to greater pressure from the conductive connector after being connected to the conductive connector, and are more likely to be welded and even damage the passivation layer there. Therefore, the connection method provided by the embodiment of the utility model can ensure that the first surface collector electrode and the second surface collector electrode located in the second end bus electrode space and the third end bus electrode space are not damaged.

[0052] In the embodiment of the utility model, there is an area without the first surface collector electrode and the second surface collector electrode in the second end busbar space and the third end busbar space, that is, a blank area. In actual use, the bent portion of the conductive connector is connected to other solar cells using the blank area to reduce or avoid the occurrence of hidden cracks or fragments of the solar cell due to the elevation of the first surface collector electrode and the second surface collector electrode, and reduce the height difference between the conductive connector to be welded to the first surface of the first solar cell and the conductive connector to be welded to the second surface of the second solar cell, so as to improve the yield of the cell string and the solar module.

[0053] In one implementation, along the first direction, the end of the first end segment extends beyond the first end pad, and the distance of the extension is less than or equal to 2 cm; and / or, along the first direction, the end of the fourth end segment extends beyond the fourth end pad, and the distance of the extension is less than or equal to 2 cm.

[0054] When the above technical solution is adopted, the adverse effect of the conductive connector on the first surface collector electrode and the second surface collector electrode in the first end bus electrode space and the fourth end bus electrode space can be reduced while ensuring stable welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0056] Figure 1 This is a schematic structural diagram of the first surface of a solar cell in an embodiment of the utility model;

[0057] Figure 2 In the embodiment of the utility model Figure 1 A schematic structural diagram of the first surface electrode structure;

[0058] Figure 3 This is a schematic diagram of the structure of the second surface of the solar cell in an embodiment of the utility model;

[0059] Figure 4 In the embodiment of the utility model Figure 3 A schematic structural diagram of the second surface electrode structure;

[0060] Figure 5 This is a structural schematic diagram of another embodiment of the first surface electrode structure in the embodiment of the utility model;

[0061] Figure 6 This is a structural schematic diagram of another embodiment of the second surface electrode structure in the embodiment of the utility model;

[0062] Figure 7 It is a schematic diagram of the structure of the solar energy component in the embodiment of the utility model.

[0063] Reference numerals:

[0064] 1-cell body, 10-first surface, 11-second surface, 12-first edge, 13-second edge; 2-first surface electrode structure, 20-first end bus electrode, 21-second end bus electrode, 22-first surface collecting electrode, 23-first end pad, 24-second end pad; 3-second surface electrode structure, 30-third end bus electrode, 31-fourth end bus electrode, 32-second surface collecting electrode, 33-third end pad, 34-fourth end pad; 4-conductive connector, 40-first connecting section, 41-second connecting section, 42-third connecting section, 43-first end section, 44-second end section, 45-third end section, 46-fourth end section; 5-first solar cell, 6-second solar cell. DETAILED DESCRIPTION

[0065] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0066] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0068] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0069] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0070] In order to solve the above technical problems, in the first aspect, the present utility model provides a solar cell. Figures 1 to 4 The solar cell comprises: a cell body 1. The cell body 1 comprises a first surface 10 and a second surface 11 opposite to each other, and a first surface electrode structure 2 and a second surface electrode structure 3 respectively formed on the first surface 10 and the second surface 11. Along a first direction, the cell body 1 comprises a first edge 12 and a second edge 13 opposite to each other.

[0071] See also Figure 1 and Figure 2 The first surface electrode structure 2 includes: a first end bus electrode 20 adjacent to the first edge 12 and spaced apart along the second direction; the second direction is different from the first direction; a second end bus electrode 21 adjacent to the second edge 13 and spaced apart along the second direction; a first surface collector electrode 22 extending along the second direction and spaced apart along the first direction; a first end pad 23 located on the side of the first end bus electrode 20 away from the first edge 12, and a second end pad 24 located on the side of the second end bus electrode 21 away from the second edge 13;

[0072] See also Figure 3 and Figure 4 The second surface electrode structure 3 includes: a third end bus electrode 30 adjacent to the first edge 12 and spaced apart along the second direction; a fourth end bus electrode 31 adjacent to the second edge 13 and spaced apart along the second direction; a second surface collector electrode 32 extending along the second direction and spaced apart along the first direction; a third end pad 33 located on the side of the third end bus electrode 30 away from the first edge 12, and a fourth end pad 34 located on the side of the fourth end bus electrode 31 away from the second edge 13;

[0073] The first end bus electrode 20, the second end bus electrode 21, the third end bus electrode 30 and the fourth end bus electrode 31 respectively include two sub-bus electrodes extending along the first direction; the space between the two sub-bus electrodes of the first end bus electrode 20, the second end bus electrode 21, the third end bus electrode 30 and the fourth end bus electrode 31 respectively constitutes the first end bus electrode space, the second end bus electrode space, the third end bus electrode space and the fourth end bus electrode space;

[0074] Among them, see Figure 2 , in the first end bus electrode space of the first end bus electrode 20, the distribution density of the first surface collector electrode 22 in at least a portion of the region adjacent to the first edge 12 is equal to the distribution density of the first surface collector electrode 22 located in the region between two adjacent first end bus electrodes 20; it should be noted that the above distribution density can be understood as: the number of first surface collector electrodes distributed per unit length along the first direction in the first end bus electrode space. The number of first surface collector electrodes distributed per unit length along the first direction in the region between two adjacent first end bus electrodes.

[0075] See also Figure 4 , in the fourth end bus electrode space of the fourth end bus electrode 31, the distribution density of the second surface collector electrode 32 in at least a portion of the region adjacent to the second edge 13 is equal to the distribution density of the second surface collector electrode 32 located in the region between two adjacent fourth end bus electrodes 31; it should be noted that the above distribution density can be understood as: the number of second surface collector electrodes distributed per unit length along the first direction in the fourth end bus electrode space. The number of second surface collector electrodes distributed per unit length along the first direction in the region between two adjacent fourth end bus electrodes.

[0076] See also Figure 2, in the second end bus electrode space of the second end bus electrode 21, the distribution density of the first surface collector electrode 22 in at least a portion of the region adjacent to the second edge 13 is less than the distribution density of the first surface collector electrode 22 in the region between two adjacent second end bus electrodes 21; it should be noted that the above distribution density can be understood as: the number of first surface collector electrodes distributed per unit length along the first direction in the second end bus electrode space. The number of first surface collector electrodes distributed per unit length along the first direction in the region between two adjacent second end bus electrodes.

[0077] See also Figure 4 , in the third end bus electrode space of the third end bus electrode 30, the distribution density of the second surface collector electrode 32 in at least a portion of the region adjacent to the first edge 12 is less than the distribution density of the second surface collector electrode 32 located in the region between two adjacent third end bus electrodes 30. It should be noted that the above distribution density can be understood as: the number of second surface collector electrodes distributed per unit length along the first direction in the third end bus electrode space. The number of second surface collector electrodes distributed per unit length along the first direction in the region between two adjacent third end bus electrodes.

[0078] In summary, combined with the above description, the above distribution density can be understood as: the number of first surface collecting electrodes or the number of second surface collecting electrodes distributed per unit length along the first direction in a certain space or a certain area.

[0079] The structure and specifications of the battery cell body can be set according to actual conditions and are not specifically limited here. The first direction and the second direction can be any two directions parallel to the surface of the battery cell body and different from each other. Figure 2 and Figure 4 , the first direction A and the second direction B are orthogonal.

[0080] Exemplarily, the first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode can be a harpoon structure or a U-shaped structure in the prior art, and the first surface collecting electrode and the second surface collecting electrode can be a sub-grid or a fine grid in the prior art.

[0081] See also Figures 1 to 4In the solar cell provided by the embodiment of the utility model, according to the foregoing description, the first end bus electrode 20 and the fourth end bus electrode 31 can be understood as a harpoon structure or a U-shaped structure in the prior art. Further, in the first end bus electrode space of the first end bus electrode 20, the distribution density of the first surface collector electrode 22 in at least a partial area adjacent to the first edge 12 is equal to the distribution density of the first surface collector electrode 22 in the area between the two adjacent first end bus electrodes 20. In the fourth end bus electrode space of the fourth end bus electrode 31, the distribution density of the second surface collector electrode 32 in at least a partial area adjacent to the second edge 13 is equal to the distribution density of the second surface collector electrode 32 in the area between the two adjacent fourth end bus electrodes 31. It should be noted that the first surface collector electrode is provided in the area between the two adjacent first end bus electrodes, and the second surface collector electrode is provided in the area between the two adjacent fourth end bus electrodes. Furthermore, a first surface collector electrode is provided in a region between two adjacent second end bus electrodes, and a second surface collector electrode is provided in a region between two adjacent third end bus electrodes.

[0082] Since there is a first surface collector electrode 22 in the first end bus electrode space, and there is a second surface collector electrode 32 in the fourth end bus electrode space. That is, in the solar cell provided in the embodiment of the utility model, at least part of the area where the harpoon structure or the U-shaped structure is located has a fine grid. At this time, the blackening of the area between the adjacent first end bus electrode 20 and the fourth end bus electrode 31 can be reduced or avoided in the EL test. Furthermore, since the first surface collector electrode 22 located in the first end bus electrode space and the second surface collector electrode 32 located in the fourth end bus electrode space meet the above conditions, the carrier collection efficiency can be improved at this time, thereby improving the current collection capacity of the first end bus electrode 20 and the fourth end bus electrode 31, and then improving the battery efficiency of the solar cell.

[0083] As a possible implementation, see Figure 2 In the second end bus electrode space, the maximum distance L1 between the first surface collector electrode 22 and the second end pad 24 is greater than the minimum distance L2 between the first surface collector electrode 22 and the second edge 13 .

[0084] At this time, the area near the second edge in the second end busbar space can be effectively prevented from being damaged during welding of the welding strip. At the same time, there are enough first surface collecting electrodes in the second end busbar space, thereby improving the carrier collection efficiency.

[0085] As a possible implementation, see Figure 4In the third end bus electrode space, the maximum distance L3 between the second surface collector electrode 32 and the third end pad 33 is greater than the minimum distance L4 between the second surface collector electrode 32 and the first edge 12 .

[0086] At this time, the area near the first edge in the third end busbar space can be effectively prevented from being damaged during welding of the welding strip. At the same time, there are enough second surface collecting electrodes in the third end busbar space, thereby improving the carrier collection efficiency.

[0087] As a possible implementation, see Figure 2 and Figure 4 The maximum distance L1 between the first surface collecting electrode 22 and the second end pad 24 in the second end bus electrode space is smaller than the maximum distance L3 between the second surface collecting electrode 32 and the third end pad 33 in the third end bus electrode space.

[0088] As a possible implementation, see Figure 1 and Figure 2 In the second end bus electrode space, the distribution density of the first surface collector electrode 22 in at least a portion of the region adjacent to the second edge 13 is greater than half the distribution density of the first surface collector electrode 22 in the region between two adjacent second end bus electrodes 21. At this time, the carrier collection efficiency in the second end bus electrode space can be guaranteed.

[0089] As a possible implementation, see Figure 3 and Figure 4 In the third end bus electrode space, the distribution density of the second surface collector electrode 32 in at least a portion of the region adjacent to the first edge 12 is greater than half the distribution density of the second surface collector electrode 32 in the region between two adjacent third end bus electrodes 30. At this time, the carrier collection efficiency in the third end bus electrode space can be guaranteed.

[0090] As a possible implementation, the second end bus electrode space includes at least one first region, a first surface collecting electrode exists in at least one first region, and the first surface collecting electrodes are uniformly distributed, and the distribution density of the first collecting electrodes in at least one first region is less than the distribution density of the first surface collecting electrodes in the region between two adjacent second end bus electrodes; and / or, the third end bus electrode space includes at least one second region, a second surface collecting electrode exists in at least one second region, and the second surface collecting electrodes are uniformly distributed, and the distribution density of the second surface collecting electrodes in at least one second region is less than the distribution density of the second surface collecting electrodes in the region between two adjacent third end bus electrodes.

[0091] As another aspect of this embodiment, see Figure 5 and Figure 6 In the second end bus electrode space and the third end bus electrode space, the first surface collecting electrode and the second surface collecting electrode can be evenly distributed in the entire space, or evenly distributed in at least a part of the space and the distribution density is less than the density between the corresponding end bus electrodes. Such a design can make the best use of the carriers generated in the second end bus electrode space or the third end bus electrode space while effectively reducing the impact of welding strip welding, so that the average collection path of the carriers is shorter and the efficiency of collecting carriers is higher.

[0092] Preferably, see Figures 1 to 4 In the first end bus electrode space, the first surface collector electrodes 22 are evenly distributed in the first end bus electrode space, and all the first surface collector electrodes 22 penetrate the first end bus electrode 20. For example, 6 or 7 first surface collector electrodes all penetrate the first end bus electrode.

[0093] In the second end bus electrode space, the first surface collector electrodes 22 are evenly distributed in the second end bus electrode space, and the first surface collector electrodes 22 partially penetrate the second end bus electrode 21. At this time, there is a blank area in the second end bus electrode space that is not penetrated by the first surface collector electrodes 22, and the blank area is close to the second edge 13. For example, four first surface collector electrodes penetrate the second end bus electrode, and two or three first surface collector electrodes do not penetrate the second end bus electrode.

[0094] In the third end bus electrode space, the second surface collector electrodes 32 are evenly distributed in the third end bus electrode space, and the second surface collector electrodes 32 partially penetrate the third end bus electrode 30. At this time, there is a blank area in the third end bus electrode space that is not penetrated by the second surface collector electrodes 32, and the blank area is close to the first edge 12. For example, five second surface collector electrodes penetrate the third end bus electrode, and two or three second surface collector electrodes do not penetrate the third end bus electrode.

[0095] In the fourth end bus electrode space, the second surface collector electrodes 32 are evenly distributed in the fourth end bus electrode space, and all the second surface collector electrodes 32 penetrate the fourth end bus electrode 31. For example, 6 to 8 second surface collector electrodes all penetrate the fourth end bus electrode.

[0096] Furthermore, the solar cell is a half-cell solar cell and adopts a multi-busbar (i.e., busbar) design. In this case, the light absorption rate of the solar cell can be increased, and the internal resistance loss can be reduced, thereby improving the efficiency of the solar module made of the solar cell and ensuring the product yield and reliability.

[0097] In a second aspect, the present invention also provides a solar cell. Figure 1 The solar cell comprises: a cell body. The cell body comprises a first surface and a second surface opposite to each other, and a first surface electrode structure and a second surface electrode structure formed on the first surface and the second surface respectively. Along a first direction, the cell body comprises a first edge and a second edge opposite to each other, and a dividing line located between the first edge and the second edge.

[0098] The first surface electrode structure includes: a first end bus electrode adjacent to the first edge and spaced along the second direction; the second direction is different from the first direction; a second end bus electrode adjacent to the dividing line and spaced along the second direction; a first surface collector electrode extending along the second direction and spaced along the first direction; a first end pad located on a side of the first end bus electrode away from the first edge, and a second end pad located on a side of the second end bus electrode away from the dividing line;

[0099] The second surface electrode structure includes: a third end bus electrode adjacent to the first edge and spaced apart along the second direction; a fourth end bus electrode adjacent to the dividing line and spaced apart along the second direction; a second surface collector electrode extending along the second direction and spaced apart along the first direction; a third end pad located on a side of the third end bus electrode away from the first edge, and a fourth end pad located on a side of the fourth end bus electrode away from the dividing line;

[0100] The first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively include two sub-bus electrodes extending along the first direction; the space between the two sub-bus electrodes of the first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively constitutes the first end bus electrode space, the second end bus electrode space, the third end bus electrode space and the fourth end bus electrode space;

[0101] Among them, in the first end bus electrode space of the first end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the first edge is equal to the distribution density of the first surface collector electrode located in the area between two adjacent first end bus electrodes; it should be noted that the above distribution density can be understood as: the number of first surface collector electrodes distributed per unit length along the first direction in the first end bus electrode space. The number of first surface collector electrodes distributed per unit length along the first direction in the area between two adjacent first end bus electrodes.

[0102] In the fourth end bus electrode space of the fourth end bus electrode, the distribution density of the second surface collector electrodes in at least a portion of the region adjacent to the dividing line is equal to the distribution density of the second surface collector electrodes located in the region between two adjacent fourth end bus electrodes; it should be noted that the above distribution density can be understood as: the number of second surface collector electrodes distributed per unit length along the first direction in the fourth end bus electrode space. The number of second surface collector electrodes distributed per unit length along the first direction in the region between two adjacent fourth end bus electrodes.

[0103] In the second end bus electrode space of the second end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the dividing line is less than the distribution density of the first surface collector electrode in the area between two adjacent second end bus electrodes; it should be noted that the above distribution density can be understood as: the number of first surface collector electrodes distributed per unit length along the first direction in the second end bus electrode space. The number of first surface collector electrodes distributed per unit length along the first direction in the area between two adjacent second end bus electrodes.

[0104] In the third end bus electrode space of the third end bus electrode, the distribution density of the second surface collector electrodes in at least a partial area adjacent to the first edge is less than the distribution density of the second surface collector electrodes in the area between two adjacent third end bus electrodes. It should be noted that the above distribution density can be understood as: the number of second surface collector electrodes distributed per unit length along the first direction in the third end bus electrode space. The number of second surface collector electrodes distributed per unit length along the first direction in the area between two adjacent third end bus electrodes.

[0105] In summary, combined with the above description, the above distribution density can be understood as: the number of first surface collecting electrodes or the number of second surface collecting electrodes distributed per unit length along the first direction in a certain space or a certain area.

[0106] The structure and specifications of the battery cell body can be set according to actual conditions and are not specifically limited here. The first direction and the second direction can be any two directions parallel to the surface of the battery cell body and different from each other. Preferably, the first direction and the second direction are orthogonal.

[0107] In the solar cell provided by the embodiment of the utility model, according to the foregoing description, the first end bus electrode and the fourth end bus electrode can be understood as a harpoon structure or a U-shaped structure in the prior art. Further, in the first end bus electrode space of the first end bus electrode, the distribution density of the first surface collector electrode in at least a partial area adjacent to the first edge is equal to the distribution density of the first surface collector electrode in the area between the two adjacent first end bus electrodes. In the fourth end bus electrode space of the fourth end bus electrode, the distribution density of the second surface collector electrode in at least a partial area adjacent to the dividing line is equal to the distribution density of the second surface collector electrode in the area between the two adjacent fourth end bus electrodes. It should be noted that the above-mentioned area between the two adjacent first end bus electrodes has a first surface collector electrode, and the area between the two adjacent fourth end bus electrodes has a second surface collector electrode. Further, the area between the two adjacent second end bus electrodes has a first surface collector electrode, and the area between the two adjacent third end bus electrodes has a second surface collector electrode.

[0108] Since there is a first surface collector electrode in the first end bus electrode space, and there is a second surface collector electrode in the fourth end bus electrode space. That is, in the solar cell provided by the utility model, at least part of the area where the harpoon structure or the U-shaped structure is located has a fine grid. At this time, the blackening of the area between the adjacent first end bus electrode and the fourth end bus electrode can be reduced or avoided in the EL test. Furthermore, since the first surface collector electrode located in the first end bus electrode space and the second surface collector electrode located in the fourth end bus electrode space meet the above conditions, the carrier collection efficiency can be improved at this time, thereby improving the current collection capacity of the first end bus electrode and the fourth end bus electrode, and then improving the battery efficiency of the solar cell.

[0109] Preferably, in the first end bus electrode space, the first surface collector electrodes are evenly distributed in the first end bus electrode space, and all the first surface collector electrodes penetrate the first end bus electrode. For example, 6 or 7 first surface collector electrodes all penetrate the first end bus electrode.

[0110] In the second end bus electrode space, the first surface collector electrodes are evenly distributed in the second end bus electrode space, and the first surface collector electrodes partially penetrate the second end bus electrode. At this time, there is a blank area in the second end bus electrode space that is not penetrated by the first surface collector electrodes, and the blank area is close to the dividing line. For example, four first surface collector electrodes penetrate the second end bus electrode, and two or three first surface collector electrodes do not penetrate the second end bus electrode.

[0111] In the third end bus electrode space, the second surface collector electrodes are evenly distributed in the third end bus electrode space, and the second surface collector electrodes partially penetrate the third end bus electrode. At this time, there is a blank area in the third end bus electrode space that is not penetrated by the second surface collector electrodes, and the blank area is close to the first edge. For example, five second surface collector electrodes penetrate the third end bus electrode, and two or three second surface collector electrodes do not penetrate the third end bus electrode.

[0112] In the fourth end bus electrode space, the second surface collector electrodes are evenly distributed in the fourth end bus electrode space, and all the second surface collector electrodes penetrate the fourth end bus electrode. For example, 6 to 8 second surface collector electrodes all penetrate the fourth end bus electrode.

[0113] As a possible implementation, in the second end busbar electrode space, the maximum distance between the first surface collector electrode and the second end pad is greater than the minimum distance between the first surface collector electrode and the dividing line. The directions of the maximum distance and the minimum distance are consistent with the first direction. In this case, it is possible to effectively avoid damage to the area near the dividing line in the second end busbar electrode space during welding of the welding strip. At the same time, there are enough first surface collector electrodes in the second end busbar electrode space, thereby improving the carrier collection efficiency.

[0114] As a possible implementation, in the third end busbar electrode space, the maximum distance between the second surface collector electrode and the third end pad is greater than the minimum distance between the second surface collector electrode and the first edge. The directions of the maximum distance and the minimum distance are consistent with the first direction. In this case, it is possible to effectively avoid damage to the area near the first edge in the third end busbar electrode space during welding of the welding strip. At the same time, there are enough second surface collector electrodes in the third end busbar electrode space, thereby improving the carrier collection efficiency.

[0115] As a possible implementation, in the second end busbar space, the distribution density of the first surface collector electrode in at least a portion of the region adjacent to the dividing line is greater than half the distribution density of the first surface collector electrode in the region between two adjacent second end busbar electrodes. In this case, the carrier collection efficiency in the second end busbar space can be guaranteed.

[0116] As a possible implementation, in the third end bus electrode space, the distribution density of the second surface collector electrode in at least a portion of the region adjacent to the first edge is greater than half the distribution density of the second surface collector electrode in the region between two adjacent third end bus electrodes. In this case, the carrier collection efficiency in the third end bus electrode space can be guaranteed.

[0117] As a possible implementation, the second end bus electrode space includes at least one first region, a first surface collecting electrode exists in at least one first region, and the first surface collecting electrodes are uniformly distributed, and the distribution density of the first collecting electrodes in at least one first region is less than the distribution density of the first surface collecting electrodes in the region between two adjacent second end bus electrodes; and / or, the third end bus electrode space includes at least one second region, a second surface collecting electrode exists in at least one second region, and the second surface collecting electrodes are uniformly distributed, and the distribution density of the second surface collecting electrodes in at least one second region is less than the distribution density of the second surface collecting electrodes in the region between two adjacent third end bus electrodes.

[0118] As another aspect of this embodiment, see Figure 5 and Figure 6 In the second end bus electrode space and the third end bus electrode space, the first surface collecting electrode and the second surface collecting electrode can be evenly distributed in the entire space, or evenly distributed in at least a part of the space and the distribution density is less than the density between the corresponding end bus electrodes. Such a design can make the best use of the carriers generated in the second end bus electrode space or the third end bus electrode space while effectively reducing the impact of welding strip welding, so that the average collection path of the carriers is shorter and the efficiency of collecting carriers is higher.

[0119] As a possible implementation, the maximum distance between the first surface collector electrode and the second end pad in the second end bus electrode space is smaller than the maximum distance between the second surface collector electrode and the third end pad in the third end bus electrode space.

[0120] In a third aspect, the present invention also provides a solar panel. Figures 1 to 7 The solar module includes a battery string, which includes a plurality of conductive connectors 4 and a plurality of spaced-apart solar cells as described in the first aspect, and the conductive connectors 4 connect the plurality of solar cells in series.

[0121] Among them, a plurality of spaced-apart solar cells include adjacent first solar cells 5 and second solar cells 6; the conductive connector 4 includes a first connecting segment 40 located on the first surface of the first solar cell 5, a second connecting segment 41 located on the second surface of the second solar cell 6, and a third connecting segment 42; the first connecting segment 40 has a first end segment 43 and a second end segment 44, the first end segment 43 is welded to the first end pad 23 of the first solar cell 5, and the second end segment 44 is welded to the second end pad 24 of the first solar cell 5; the second connecting segment 41 includes a third end segment 45 and a fourth end segment 46, the third end segment 45 is welded to the third end pad 33 of the second solar cell 6, and the fourth end segment 46 is welded to the fourth end pad 34 of the second solar cell 6; the second end segment 44 and the third end segment 45 are connected via the third connecting segment 42.

[0122] The conductive connector may be a welding strip or other connector for connecting solar cells. When the conductive connector is a welding strip, the welding strip may be a welding strip with a circular, triangular or rectangular cross section. Preferably, a welding strip with a circular cross section is used. In this case, the mechanical stress at the connection of the solar cell can be dealt with, the problem of hidden cracks in high-density solar modules can be eliminated, and the reliability of the solar modules can be improved.

[0123] In the solar module provided by the embodiment of the utility model, the first end section 43 and the fourth end section 46 are the starting point and the ending point of the conductive connector 4, respectively. Since the first end section 43 is welded to the first end pad 23 of the first solar cell 5, the fourth end section 46 is welded to the fourth end pad 34 of the second solar cell 6. In combination with the description of the solar cell in the first aspect, it can be seen that the first surface collector electrode 22 located in the first end bus electrode space and the second surface collector electrode 32 located in the fourth end bus electrode space have a large distribution density, and the first surface collector electrode 22 and the second surface collector electrode 32 will not be affected by the welding of the conductive connector.

[0124] At this time, not only can the carrier collection efficiency be improved, thereby improving the current collection capacity of the first end bus electrode 20 and the fourth end bus electrode 31, and further improving the cell efficiency of the solar cell. At the same time, there is no need to worry about the damage of the first surface collector electrode and the second surface collector electrode in the first end bus space and the fourth end bus space due to the influence of the conductive connector. Therefore, the connection method provided by the embodiment of the utility model can ensure that the first surface collector electrode and the second surface collector electrode located in the first end bus electrode space and the fourth end bus electrode space and close to the first edge and the second edge are not damaged.

[0125] Further, after the conductive connector 4 is connected to the solar cell, it passes through the second end pad 24 and the third end pad 33, and at this time, the conductive connector 4 extends through the second end bus electrode space and the third end bus electrode space in its length direction. Combined with the description of the solar cell in the first aspect, it can be seen that in the second end bus electrode space of the second end bus electrode 21, the distribution density of the first surface collector electrode 22 in at least a partial area adjacent to the second edge 13 is less than the distribution density of the first surface collector electrode 22 in the area between two adjacent second end bus electrodes 21. In the third end bus electrode space of the third end bus electrode 30, the distribution density of the second surface collector electrode 32 in at least a partial area adjacent to the first edge 12 is less than the distribution density of the second surface collector electrode 32 in the area between two adjacent third end bus electrodes 30. It should be noted that there is a first surface collector electrode in the area between two adjacent second end bus electrodes, and there is a second surface collector electrode in the area between two adjacent third end bus electrodes.

[0126] At this time, the influence of the welding of the conductive connector 4 on the first surface collector electrode 22 and the second surface collector electrode 32 in the second end busbar electrode space and the third end busbar electrode space can be reduced, and the number of the first surface collector electrode 22 and the second surface collector electrode 32 damaged can be avoided or reduced as much as possible. In particular, the first surface collector electrode 22 and the second surface collector electrode 32 located in the second end busbar electrode space and the third end busbar electrode space and close to the first edge 12 and the second edge 13 are subjected to greater pressure from the conductive connector 4 after being connected to the conductive connector, and are more likely to be welded or even damage the passivation layer there. Therefore, the connection method provided by the embodiment of the utility model can ensure that the first surface collector electrode and the second surface collector electrode located in the second end busbar electrode space and the third end busbar electrode space are not damaged.

[0127] In the embodiment of the utility model, there are areas without the first surface collector electrode 22 and the second surface collector electrode 32 in the second end busbar space and the third end busbar space, that is, blank areas. In actual use, the bent portion of the conductive connector 4 is connected to other solar cells using the blank area to reduce or avoid the occurrence of hidden cracks or fragments of the solar cell due to the elevation of the first surface collector electrode 22 and the second surface collector electrode 32, and to reduce the height difference between the conductive connector 4 to be welded to the first surface 10 of the first solar cell 5 and the conductive connector 4 to be welded to the second surface 11 of the second solar cell 6, so as to improve the yield of the cell string and the solar module.

[0128] As a possible implementation, see Figure 7, along the first direction, the end of the first end segment 43 exceeds the first end pad 23, and the exceeding distance is less than or equal to 2 cm; and / or, along the first direction, the end of the fourth end segment 46 exceeds the fourth end pad 34, and the exceeding distance is less than or equal to 2 cm.

[0129] At this time, while ensuring stable welding, the adverse effects of the conductive connector on the first surface collecting electrode and the second surface collecting electrode in the first end bus bar space and the fourth end bus bar space can be reduced.

[0130] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0131] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A solar cell, characterized in that: The solar cell comprises a cell body, the cell body comprises a first surface and a second surface opposite to each other, and a first surface electrode structure and a second surface electrode structure formed on the first surface and the second surface respectively; Along the first direction, the battery sheet body includes a first edge and a second edge opposite to each other; The first surface electrode structure comprises: a first end bus electrode adjacent to the first edge and spaced along a second direction; the second direction is different from the first direction; a second end bus electrode adjacent to the second edge and spaced along the second direction; a first surface collector electrode extending along the second direction and spaced along the first direction; a first end pad located on a side of the first end bus electrode away from the first edge, and a second end pad located on a side of the second end bus electrode away from the second edge; The second surface electrode structure comprises: a third end bus electrode adjacent to the first edge and spaced apart along the second direction; a fourth end bus electrode adjacent to the second edge and spaced apart along the second direction; a second surface collector electrode extending along the second direction and spaced apart along the first direction; a third end pad located on a side of the third end bus electrode away from the first edge, and a fourth end pad located on a side of the fourth end bus electrode away from the second edge; The first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively include two sub-bus electrodes extending along the first direction; the space between the two sub-bus electrodes of the first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively constitutes a first end bus electrode space, a second end bus electrode space, a third end bus electrode space and a fourth end bus electrode space; Wherein, in the first end bus electrode space of the first end bus electrode, the distribution density of the first surface collector electrodes in at least a partial area adjacent to the first edge is equal to the distribution density of the first surface collector electrodes in the area between two adjacent first end bus electrodes; In the fourth end bus electrode space of the fourth end bus electrode, the distribution density of the second surface collector electrodes in at least a partial region adjacent to the second edge is equal to the distribution density of the second surface collector electrodes in a region between two adjacent fourth end bus electrodes; In the second end bus electrode space of the second end bus electrode, the distribution density of the first surface collector electrodes in at least a partial region adjacent to the second edge is smaller than the distribution density of the first surface collector electrodes in a region between two adjacent second end bus electrodes; In the third end bus electrode space of the third end bus electrode, the distribution density of the second surface collecting electrodes in at least a partial area adjacent to the first edge is smaller than the distribution density of the second surface collecting electrodes in the area between two adjacent third end bus electrodes.

2. The solar cell according to claim 1, characterized in that In the second end bus electrode space, the maximum distance between the first surface collecting electrode and the second end pad is greater than the minimum distance between the first surface collecting electrode and the second edge; and / or, in the third end bus electrode space, the maximum distance between the second surface collecting electrode and the third end pad is greater than the minimum distance between the second surface collecting electrode and the first edge.

3. The solar cell according to claim 1, characterized in that In the second end bus electrode space, the distribution density of the first surface collecting electrodes in at least a partial area adjacent to the second edge is greater than half of the distribution density of the first surface collecting electrodes in the area between two adjacent second end bus electrodes; and / or, in the third end bus electrode space, the distribution density of the second surface collecting electrodes in at least a partial area adjacent to the first edge is greater than half of the distribution density of the second surface collecting electrodes in the area between two adjacent third end bus electrodes.

4. A solar cell, characterized in that: The solar cell comprises a cell body, the cell body comprises a first surface and a second surface opposite to each other, and a first surface electrode structure and a second surface electrode structure formed on the first surface and the second surface respectively; Along the first direction, the battery sheet body includes an opposite first edge, a second edge, and a dividing line between the first edge and the second edge; The first surface electrode structure comprises: a first end bus electrode adjacent to the first edge and spaced along a second direction; the second direction is different from the first direction; a second end bus electrode adjacent to the dividing line and spaced along the second direction; a first surface collector electrode extending along the second direction and spaced along the first direction; a first end pad located on a side of the first end bus electrode away from the first edge, and a second end pad located on a side of the second end bus electrode away from the dividing line; The second surface electrode structure comprises: a third end bus electrode adjacent to the first edge and spaced apart along the second direction; a fourth end bus electrode adjacent to the dividing line and spaced apart along the second direction; a second surface collector electrode extending along the second direction and spaced apart along the first direction; a third end pad located on a side of the third end bus electrode away from the first edge, and a fourth end pad located on a side of the fourth end bus electrode away from the dividing line; The first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively include two sub-bus electrodes extending along the first direction; the space between the two sub-bus electrodes of the first end bus electrode, the second end bus electrode, the third end bus electrode and the fourth end bus electrode respectively constitutes a first end bus electrode space, a second end bus electrode space, a third end bus electrode space and a fourth end bus electrode space; Wherein, in the first end bus electrode space of the first end bus electrode, the distribution density of the first surface collector electrodes in at least a partial area adjacent to the first edge is equal to the distribution density of the first surface collector electrodes in the area between two adjacent first end bus electrodes; In the fourth end bus electrode space of the fourth end bus electrode, the distribution density of the second surface collector electrodes in at least a partial area adjacent to the dividing line is equal to the distribution density of the second surface collector electrodes located in the area between two adjacent fourth end bus electrodes; In the second end bus electrode space of the second end bus electrode, the distribution density of the first surface collector electrodes in at least a partial area adjacent to the dividing line is smaller than the distribution density of the first surface collector electrodes in an area between two adjacent second end bus electrodes; In the third end bus electrode space of the third end bus electrode, the distribution density of the second surface collecting electrodes in at least a partial area adjacent to the first edge is smaller than the distribution density of the second surface collecting electrodes in the area between two adjacent third end bus electrodes.

5. The solar cell according to claim 4, characterized in that: In the second end bus electrode space, the maximum distance between the first surface collecting electrode and the second end pad is greater than the minimum distance between the first surface collecting electrode and the dividing line; and / or, in the third end bus electrode space, the maximum distance between the second surface collecting electrode and the third end pad is greater than the minimum distance between the second surface collecting electrode and the first edge.

6. The solar cell according to claim 4, characterized in that: In the second end bus electrode space, the distribution density of the first surface collecting electrodes in at least a partial area adjacent to the dividing line is greater than half of the distribution density of the first surface collecting electrodes in the area between two adjacent second end bus electrodes; and / or, in the third end bus electrode space, the distribution density of the second surface collecting electrodes in at least a partial area adjacent to the first edge is greater than half of the distribution density of the second surface collecting electrodes in the area between two adjacent third end bus electrodes.

7. The solar cell according to claim 1 or 4, characterized in that: The second end bus electrode space includes at least one first area, the first surface collecting electrode exists in the at least one first area, and the first surface collecting electrodes are uniformly distributed, and the distribution density of the first collecting electrodes in the at least one first area is less than the distribution density of the first surface collecting electrodes in the area between two adjacent second end bus electrodes; and / or, the third end bus electrode space includes at least one second area, the second surface collecting electrode exists in the at least one second area, and the second surface collecting electrodes are uniformly distributed, and the distribution density of the second surface collecting electrodes in the at least one second area is less than the distribution density of the second surface collecting electrodes in the area between two adjacent third end bus electrodes.

8. The solar cell according to claim 1 or 4, characterized in that: A maximum distance between the first surface collector electrode and the second end pad in the second end bus electrode space is smaller than a maximum distance between the second surface collector electrode and the third end pad in the third end bus electrode space.

9. A solar panel, characterized in that: The solar module comprises a battery string; the battery string comprises a plurality of conductive connectors and a plurality of solar cells as claimed in any one of claims 1 to 3 arranged at intervals, the conductive connectors connecting the plurality of solar cells in series; Among them, the multiple spaced-apart solar cells include adjacent first and second solar cells; the conductive connector includes a first connecting segment located on the first surface of the first solar cell, a second connecting segment located on the second surface of the second solar cell, and a third connecting segment; the first connecting segment has a first end segment and a second end segment, the first end segment is welded to the first end pad of the first solar cell, and the second end segment is welded to the second end pad of the first solar cell; the second connecting segment includes a third end segment and a fourth end segment, the third end segment is welded to the third end pad of the second solar cell, and the fourth end segment is welded to the fourth end pad of the second solar cell; the second end segment and the third end segment are connected via the third connecting segment.

10. The solar module according to claim 9, characterized in that Along the first direction, the end of the first end segment exceeds the first end pad, and the exceeding distance is less than or equal to 2 cm; and / or, Along the first direction, the end of the fourth end segment exceeds the fourth end pad, and the exceeding distance is less than or equal to 2 cm.

Images