A solar cell

Abstract

This application relates to a solar cell, comprising at least two connected cells. Each cell includes: a substrate, a first surface of which has a main region and a first edge region distributed along a first direction beside the main region; a first conductive structure, including a plurality of main grid lines and a plurality of edge grid lines spaced apart along the first direction within the main region, the main grid lines and edge grid lines extending along a second direction; and a second conductive structure, including a plurality of current collector grid members spaced apart along the second direction within the first edge region, at least one current collector grid member having an extension grid member. The current collector grid member extends along the first direction and is correspondingly connected to the edge grid lines. The extension grid member extends along the first direction from one end of the current collector grid member near the main region into the main region, and the end of the extension grid member away from the current collector grid member is connected to at least one main grid line, thereby effectively improving the current collection capability of the cell.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a solar cell. Background Technology

[0002] With increasing competition in the photovoltaic industry, companies urgently need to reduce costs and increase efficiency through technological innovation. Busbar-less technology, by eliminating the main busbar, can reduce the amount of silver paste used by 20%-40%, thereby significantly reducing the production cost of solar cells.

[0003] However, since the gridless technology requires removing the main grid from the cell and connecting it directly to the solder strip through the fine grid, this welding method is prone to desoldering or poor soldering of the solder joint between the fine grid and the solder strip, thereby reducing the cell's ability to collect current. Utility Model Content

[0004] Therefore, it is necessary to provide a solar cell that addresses the problem of low current collection capability of solar cells.

[0005] A solar cell includes at least two connected cells, the cells comprising:

[0006] A substrate, wherein a first surface of the substrate has a main region and a first edge region distributed along a first direction on the side of the main region;

[0007] A first conductive structure includes a plurality of main gate lines spaced apart in the main body region along the first direction and a plurality of edge gate lines spaced apart in the first edge region along the first direction, wherein the main gate lines and the edge gate lines extend along a second direction and the first direction intersects the second direction;

[0008] The second conductive structure includes a plurality of current collector grid members spaced apart in the first edge region along the second direction, at least one of the current collector grid members having an extension grid member, the current collector grid members extending along the first direction and correspondingly connected to the edge grid line, the extension grid member extending along the first direction from one end of the current collector grid member near the main region into the main region, and the end of the extension grid member away from the current collector grid member being connected to at least one of the main grid lines.

[0009] In one embodiment, the battery cell further includes:

[0010] The welding structure includes a plurality of solder strips located on the side of the first conductive structure away from the substrate; the solder strips extend along the first direction, and in the second direction, the plurality of solder strips are arranged in a one-to-one correspondence with the plurality of current collector components.

[0011] In one embodiment, the current collector component includes a plurality of current collector lines spaced apart in the second direction; the current collector lines and the corresponding solder strips have a gap in the second direction, and the current collector lines and the corresponding solder strips are indirectly connected.

[0012] In one embodiment, the battery cell further includes:

[0013] The reinforcing structure includes a first pad component disposed between the main gate line and the solder strip; the main gate line is correspondingly connected to the solder strip through the first pad component.

[0014] In one embodiment, the first pad component includes a plurality of first reinforcing pads connected to the side of the main gate line away from the substrate;

[0015] The solder strip is connected to the extended gate component via the first reinforcing pad.

[0016] In one embodiment, it is characterized in that,

[0017] The width of the main grid line is the same as the width of the edge grid line;

[0018] The width of the current collector component is the same as the width of the extension gate component;

[0019] The width of the current collector component is greater than the width of the main grid line.

[0020] In one embodiment, the first surface of the substrate is further formed with a second edge region distributed along the second direction on the side of the main region;

[0021] The battery cell also includes:

[0022] The third conductive structure includes a connecting gate line formed in the second edge region; the connecting gate line extends along the first direction; the connecting gate line is connected to each of the edge gate lines, and one end of the connecting gate line away from the first edge region extends into the main body region and is connected to at least one of the main gate lines.

[0023] In one embodiment, the plurality of edge gate lines include a plurality of first edge gate lines and a plurality of second edge gate lines with opposite polarities; the plurality of current collector components include a plurality of first current collector components and a plurality of second current collector components with opposite polarities; the first current collector components are correspondingly connected to the first edge gate lines, and the second current collector components are correspondingly connected to the second edge gate lines.

[0024] In one embodiment, within the first edge region, a first isolation gap is formed at the position of the first edge grid line corresponding to the position of the second current collector component, and the second current collector component is formed within the corresponding first isolation gap and spaced apart from the first edge grid line; a second isolation gap is formed at the position of the second edge grid line corresponding to the position of the first current collector component, and the first current collector component is formed within the corresponding second isolation gap and spaced apart from the second edge grid line.

[0025] In one embodiment, the plurality of solder strips include a plurality of first solder strips and a plurality of second solder strips, wherein the plurality of first solder strips are configured one-to-one with a plurality of first current collector components, and the plurality of second solder strips are configured one-to-one with a plurality of second current collector components; the plurality of main grid lines include a plurality of first main grid lines and a plurality of second main grid lines with opposite polarities.

[0026] The battery cell also includes:

[0027] An insulating structure includes a first insulating pad disposed on each of the first main grid lines for isolating the first main grid lines from the second solder strip, and a second insulating pad disposed on each of the second main grid lines for isolating the second main grid lines from the first solder strip.

[0028] The aforementioned solar cell, by setting edge grid lines and a second conductive structure connected to the edge grid lines, such as a current collector, within the first edge region of the substrate, enables the edge grid lines to collect the photogenerated signal generated in the first edge region and transmit it to the connected current collector to form a current, thereby effectively improving the cell's current collection capability in the first edge region. Simultaneously, at least one current collector has an extension grid member extending from the first edge region into the main body region. This extension grid member increases the number of connection points between the first and second conductive structures. When the solar cell is subjected to external forces or temperature changes that generate stress, on the one hand, the extension grid member can disperse the stress, preventing stress concentration in the first edge region of the cell. On the other hand, the design of multiple connection points allows current transmission to continue even when some connection points fail, thereby improving the solar cell's collection capability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a solar cell in an embodiment of this application.

[0030] Figure 2 for Figure 1 A schematic diagram of the structure of the middle substrate.

[0031] Figure 3 This is a schematic diagram of the structure of a battery cell according to another embodiment of this application.

[0032] Figure 4 This is a schematic diagram of the second conductive structure according to another embodiment of this application.

[0033] Figure 5 This is a schematic diagram of the transmission path of photogenerated signals before and after desoldering in a solar cell.

[0034] Figure 6 This is a schematic diagram of the third conductive structure in another embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10 battery cells;

[0037] Substrate 100, main body region 110, first edge region 120, second edge region 130;

[0038] First conductive structure 200, main gate line 210, first main gate line 211, second main gate line 212, edge gate line 220, first edge gate line 221, first isolation gap 2211, second edge gate line 222, second isolation gap 2221;

[0039] Second conductive structure 300, current collector component 310, current collector wire 311, first current collector component 312, second current collector component 313, extension gate component 320;

[0040] Welding structure 400, welding strip 410, first welding strip 411, second welding strip 412;

[0041] Reinforcing structure 500, first pad component 510, first reinforcing pad 511, second pad component 520, second reinforcing pad 521;

[0042] Third conductive structure 600, connecting gate line 610;

[0043] Insulation structure 700, first insulating pad 710, second insulating pad 720. Detailed Implementation

[0044] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0045] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0046] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0050] Please see Figure 1 The solar cell provided in one embodiment of this application includes at least two connected solar cells 10. The connection of the at least two solar cells 10 can be in series or in parallel, and adjacent solar cells 10 can be connected by a welding structure 400.

[0051] The solar cell 10 includes a substrate 100, a first conductive structure 200, and a second conductive structure 300. A main region 110 and a first edge region 120 distributed along a first direction beside the main region 110 are formed on a first surface of the substrate 100. The first conductive structure 200 includes a plurality of main grid lines 210 spaced apart along the first direction within the main region 110 and a plurality of edge grid lines 220 spaced apart along the first direction within the first edge region 120. The main grid lines 210 and the edge grid lines 220 extend along a second direction, and the first direction intersects the second direction. The second conductive structure 300 includes a plurality of current collector gate components 310 spaced apart in the first edge region 120 along a second direction. At least one current collector gate component 310 has an extension gate component 320. The current collector gate component 310 extends along a first direction and is correspondingly connected to the edge gate line 220. The extension gate component 320 extends along the first direction from one end of the current collector gate component 310 near the main body region 110 into the main body region 110. The end of the extension gate component 320 away from the current collector gate component 310 is connected to at least one main gate line 210.

[0052] In the aforementioned solar cell, by providing an edge grid line 220 and a second conductive structure 300 connected to the edge grid line 220, such as a current collector 310, within the first edge region 120 of the substrate 100, the edge grid line 220 can collect the photogenerated signal generated in the first edge region 120 and transmit it to the connected current collector 310 to form a current, thereby effectively improving the current collection capability of the cell in the first edge region 120. Simultaneously, at least one current collector 310 has an extension grid member 320 extending from the first edge region 120 into the main body region 110. The extension grid member 320 can increase the number of connection points between the first conductive structure 200 and the second conductive structure 300. This allows the solar cell to disperse stress when subjected to external forces or temperature changes, preventing stress concentration in the first edge region 120 of the cell 10. Furthermore, the design of multiple connection points ensures that even if some connection points fail, other connection points can still transmit current, thereby improving the solar cell's collection capability.

[0053] For example, please refer to Figure 2 The substrate 100 has a first surface and a second surface, with the second surface facing away from the first surface. In this embodiment, a back-contact solar cell is used as an example; the first surface can be the back surface of the substrate 100, and the second surface can be the front surface of the substrate 100. It is understood that in some other embodiments, the first surface can also be the front surface of the substrate 100, and the second surface can be the back surface of the substrate 100. The substrate 100 has an overall rectangular plate-like structure. On the first surface of the substrate 100, a main region 110 and a first edge region 120 disposed beside the main region 110 along a first direction are formed. The first direction can be the length direction of the substrate 100 (e.g., the longitudinal direction of the substrate 100). Figure 2 (in the X direction). In specific implementation, a first edge region 120 can be set on one side of the main body region 110, or a first edge region 120 can be formed on both sides of the main body region 110. A second conductive structure 300 is set in each of the two first edge regions 120 to collect the photogenerated signal generated by the two edge regions of the battery cell 10 in the first direction and form a current, thereby improving the current collection capability of the battery cell 10.

[0054] A first conductive structure 200 is formed on a first surface of the substrate 100. The first conductive structure 200 includes a plurality of main gate lines 210 and a plurality of edge gate lines 220. The main gate lines 210 are used to collect and output photogenerated signals (such as photogenerated carriers, photogenerated current, etc.) generated in the main region 110 on the substrate 100. The edge gate lines 220 are used to collect and output photogenerated signals generated in the first edge region 120 on the substrate 100. The plurality of main gate lines 210 are spaced apart along a first direction, and the plurality of edge gate lines 220 are spaced apart along the first direction. At the position where the main region 110 and the first edge region 120 are adjacent, the main gate lines 210 and the edge gate lines 220 are also spaced apart, so that the substrate 100 can detect light signals through the gap between two main gate lines 210, ensuring the light signal detection of the solar cell 10. At the same time, the main gate lines 210 and the edge gate lines 220 extend along a second direction, which can be the width direction of the substrate 100 (e.g., the direction of width of the substrate 100). Figure 2 (Y direction in the equation), the second direction intersects the first direction, for example, the second direction can be orthogonal to the first direction.

[0055] A second conductive structure 300 is formed on the first surface of the substrate 100. The second conductive structure 300 includes a plurality of current collector gate components 310, at least one of which has an extended gate component 320. In this embodiment, each current collector gate component 310 has an extended gate component 320 to maximize current collection in the first edge region 120. It is understood that in some other embodiments, some of the current collector gate components 310 may have extended gate components 320, such as the current collector gate component 310 located in the middle having an extended gate component 320 while the current collector gate components on both sides do not have extended gate components 320, or the current collector gate component 310 at any position has an extended gate component 320 while the current collector gate component 310 at other positions does not have an extended gate component 320, in order to reduce the amount of silver paste used and save production costs.

[0056] The current collector component 310 extends along a first direction, thereby connecting with each edge grid line 220 distributed within the first edge region 120 to collect and output the photogenerated signals collected by each edge grid line 220. Multiple current collector components 310 are spaced apart along a second direction to form multiple current-collecting regions within the first edge region 120, improving the current-collecting effect within the first edge region 120.

[0057] The extension gate component 320 extends along a first direction from one end of the current collector gate component 310 near the main body region 110 into the main body region 110. Thus, the end of the extension gate component 320 away from the current collector gate component 310 can be connected to at least one main gate line 210. For example, if the extension gate component 320 is connected to two main gate lines 210, the photogenerated signals collected by each main gate line 210 can be collected and output.

[0058] In one embodiment, the battery cell 10 further includes a welding structure 400. The welding structure 400 includes a plurality of solder strips 410 located on the side of the first conductive structure 200 away from the substrate; the solder strips 410 extend along a first direction, and in a second direction, the plurality of solder strips 410 are disposed in a one-to-one correspondence with a plurality of current collector components 310.

[0059] Please see Figure 3 A welding structure 400 is disposed on the side of the first conductive structure 200 away from the substrate 100, for connection to the first conductive structure 200, to receive photogenerated signals generated by the main gate line 210 and the edge gate line 220 and output photogenerated current. For example, the welding structure 400 includes a plurality of solder strips 410 for connection to the side of the first conductive structure 200 away from the substrate 100. Specifically, the solder strips 410 extend along a first direction to connect with each main gate line 210 and each edge gate line 220 in the extending direction, facilitating the reception of photogenerated signals from corresponding areas on the main gate line 210 and the edge gate line 220. When the solder ribbon 410 is arranged in correspondence with the current collector component 310, it can be arranged in correspondence with at least one current collector component 310 in terms of quantity and position. For example, each current collector component 310 has a corresponding solder ribbon 410 to receive the photogenerated signal generated thereon. Or, a solder ribbon 410 is arranged on the side of each current collector component 310 away from the substrate 100. The solder ribbon 410 extends in a first direction to transmit the photogenerated signal collected on the current collector component 310 to the solder ribbon 410.

[0060] In an exemplary embodiment, the current collector component 310 includes a current collector line 311, and correspondingly, at least one current collector line 311 included in the current collector component 310 has a correspondingly extended extension line. The projections of the current collector line 311 and the extension line onto the plane where the solder ribbon 410 is located can be located within the solder ribbon 410. This arrangement can shorten the transmission distance of the photogenerated signal on the current collector line 311 and the extension line to the solder ribbon 410, thereby reducing the transmission loss of the photogenerated signal.

[0061] In one embodiment, the current collector component 310 includes a plurality of current collector lines 311 spaced apart in a second direction; there is a gap between the current collector lines 311 and the corresponding solder strips 410 in the second direction, and the current collector lines 311 and the corresponding solder strips 410 are indirectly connected.

[0062] Please see Figure 4 Each current collector component 310 may include two current collector lines 311 spaced apart along a second direction. Correspondingly, at least one current collector component 310 includes two current collector lines 311 with corresponding extended lines. The arrangement of multiple current collector lines 311 further increases the current collection capability of the first edge region 120. Simultaneously, with the increase in current collector lines 311, the stress in the first edge region 120 can be further dispersed, thereby ensuring the connection strength between the first conductive structure 200 and the solder strip 410. A gap exists between the current collector line 311 and the corresponding solder strip 410 in the second direction; similarly, a gap also exists between the extended line and the solder strip 410 in the second direction. In specific implementation, the solder ribbon 410 has welding areas corresponding to and connected to the main gate line 210 and the edge gate line 220. The projections of the current collector line 311 and the extension gate line on the plane of the solder ribbon 410 are located outside the welding areas of the solder ribbon 410, so that the current collector line 311 and the extension gate line are staggered from the welding areas on the solder ribbon 410 in a direction perpendicular to the plane of the substrate 100, thereby reducing the interference of the current collector line 311 and the extension gate line on the solder ribbon 410 during the welding process. The current collector line 311 is indirectly connected to the corresponding solder ribbon 410. For example, the current collector line 311 and the corresponding solder ribbon 410 can be connected through a reinforcing structure 500. Correspondingly, the extension gate line is also connected to the corresponding solder ribbon 410 through the reinforcing structure 500. In this way, the photogenerated signals on the current collector line 311 and the extension gate line can be transmitted to the solder ribbon 410 through the reinforcing structure 500.

[0063] In one embodiment, the battery cell 10 further includes a reinforcing structure 500. The reinforcing structure 500 includes a first pad component 510 disposed between the main grid line 210 and the solder strip 410; the main grid line 210 is correspondingly connected to the solder strip 410 through the first pad component 510.

[0064] Please see Figure 1 and Figure 3 A reinforcing structure 500 is disposed between the first conductive structure 200 and the welding structure 400 to increase the connection strength between the first conductive structure 200 and the welding structure 400. The reinforcing structure 500 includes a first pad component 510, which is disposed between the main gate line 210 and the corresponding solder strip 410. The first pad component 510 is used to connect the main gate line 210 and the corresponding solder strip 410, so that the photogenerated signal on the main gate line 210 can be transmitted to the corresponding solder strip 410 through the first pad component 510.

[0065] In one embodiment, the first pad component 510 includes a plurality of first reinforcing pads 511 connected to the side of the main gate line 210 away from the substrate 100; wherein the solder strip 410 is correspondingly connected to the extension gate component 320 through the first reinforcing pads 511.

[0066] The first pad component 510 includes a plurality of first reinforcing pads 511. Since the plurality of main gate lines 210 extend along a second direction and the plurality of solder ribbons 410 extend along a first direction, the projections of the main gate lines 210 and solder ribbons 410 on the plane of the substrate 100 intersect. A soldering area is formed on the solder ribbon 410 at the position corresponding to this intersection. A first reinforcing pad 511 is connected to the side of each main gate line 210 away from the substrate 100 and at the position corresponding to the soldering area. The side of the first reinforcing pad 511 away from the main gate line 210 is connected to the soldering area, allowing the photogenerated signal collected on the main gate line 210 to be transmitted to the solder ribbon 410 through the first reinforcing pad 511. Furthermore, on the main gate line 210 connected to the extension gate component 320, the first reinforcing pad 511 is also connected to the extension gate component 320, allowing the photogenerated signal collected on the extension gate component 320 to be transmitted to the solder ribbon 410 through the first reinforcing pad 511.

[0067] In an optional embodiment, the reinforcing structure 500 may further include a second pad component 520 disposed between the edge gate line 220 and the solder strip 410. The second pad component 520 is used to connect the edge gate line 220 and the corresponding solder strip 410, so that the photogenerated signal on the edge gate line 220 can be transmitted to the corresponding solder strip 410 through the second pad component 520.

[0068] The second pad component 520 includes a plurality of second reinforcing pads 521. Since the plurality of edge gate lines 220 extend along a second direction and the plurality of solder ribbons 410 extend along a first direction, the projections of the edge gate lines 220 and the solder ribbons 410 on the plane of the substrate 100 intersect. A soldering area is also formed on the solder ribbons 410 at the location corresponding to this intersection. A second reinforcing pad 521 is connected to the side of each edge gate line 220 away from the substrate 100 and at the location corresponding to the soldering area. The side of the second reinforcing pad 521 away from the edge gate line 220 is connected to the soldering area, allowing the photogenerated signal collected on the edge gate line 220 to be transmitted to the solder ribbon 410 through the second reinforcing pad 521. Furthermore, the second reinforcing pad 521 is also connected to the current collector component 310, allowing the photogenerated signal collected on the current collector component 310 to be transmitted to the solder ribbon 410 through the second reinforcing pad 521.

[0069] In one exemplary embodiment, please refer to Figure 5The current collector component 310, which has an extension gate component 320, can connect multiple edge gate lines 220 and at least one main gate line 210 in the first direction. Both the main gate line 210 and the extension gate line can be connected to the corresponding solder ribbon 410 through the first reinforcing pad 511. The edge gate line 220 and the current collector line 311 can be connected to the corresponding solder ribbon 410 through the second reinforcing pad 521. In this way, multiple connection points can be formed between the first conductive structure 200 and the second conductive structure 300 and between the first conductive structure 200, the second conductive structure 300 and the solder ribbon 410 through their respective reinforcing pads. In the first edge region 120, the photogenerated signal generated on the substrate 100 is converged by the current collector component 310 and then transmitted to the solder ribbon 410 through multiple connection points. When the connection point near the edge of the substrate 100 is desoldered due to edge stress concentration, the edge grid line 220 is disconnected from the solder ribbon 410. At this time, since there are multiple connection points, the photogenerated signal after the current collector grid component 310 is gathered can be transmitted to the solder ribbon 410 through other unfailed connection points to ensure the current collection capability of the cell 10.

[0070] In one embodiment, the width of the main gate line 210 is the same as the width of the edge gate line 220; the width of the current collector 310 is the same as the width of the extension gate member 320; and the width of the current collector 310 is greater than the width of the main gate line 210.

[0071] The width of the main gate line 210 refers to its width in the first direction, and the width of the edge gate line 220 refers to its width in the first direction. The widths of the main gate line 210 and the edge gate line 220 are the same. The width of the current collector gate component 310 can be represented by the width of the current collector gate line 311, which refers to its width in the second direction. The width of the extension gate component 320 can be represented by the width of the extension gate line, which refers to its width in the second direction. The widths of the current collector gate line 311 and the extension gate line are the same. The widths of the current collector 310 and the extension grid 320 are greater than the widths of the main grid line 210 and the edge grid line 220. On the one hand, this increases the contact area between the current collector 311 and the edge grid line 220, as well as the contact area between the extension grid line and the main grid line 210. This, in turn, increases the connection strength between the current collector 311 and the edge grid line 220, and the connection strength between the extension grid line and the main grid line 210. On the other hand, the relatively wide current collector 311 and the extension grid line can increase the amount of photogenerated signal collected, thereby improving the current collection capability of the solar cell 10.

[0072] Optionally, the widths of the main gate line 210 and the edge gate line 220 may be equal or unequal. For example, in some embodiments, the width of the edge gate line 220 may be greater than the width of the main gate line 210 to increase the ability of the edge gate line 220 to collect photogenerated signals in the edge region.

[0073] In one embodiment, the first surface of the substrate 100 is further formed with a second edge region 130 distributed along a second direction on the side of the main region 110.

[0074] Furthermore, the battery cell 10 also includes a third conductive structure 600. The third conductive structure 600 includes a connecting grid line 610 formed in the second edge region 130; the connecting grid line 610 extends along a first direction; the connecting grid line 610 is connected to each edge grid line 220, and one end of the connecting grid line 610 away from the first edge region 120 extends into the main body region 110 and is connected to at least one main grid line 210.

[0075] Please return to the reference. Figure 1 A second edge region 130 is formed on the first surface of the substrate 100. In a specific implementation, the second edge region 130 can be provided on one side of the main body region 110 along the second direction, or the second edge region 130 can be formed on both sides of the main body region 110 respectively, and a third conductive structure 600 is provided in each of the two second edge regions 130 to connect each edge gate line 220 to at least one main gate line 210 through the third conductive structure 600, so as to ensure effective collection of photogenerated signals at each point on the edge gate line 220 and the corresponding main gate line 210.

[0076] Within the second edge region 130, each edge gate line 220 and the main gate line 210 connected to the extension gate line have an extension end extending into the second edge region 130. The connecting gate line 610 extends along the first direction to connect the extension ends of each edge gate line 220 and the main gate line 210, thereby ensuring the collection of photogenerated signals at the ends of the edge gate line 220 and the extension gate line.

[0077] In other embodiments, please refer to Figure 6 Second edge regions 130 can be set on both sides of the main body region 110, and a third conductive structure 600 can be set in each of the second edge regions 130. When the third conductive structure 600 is set, the extension gate component 320 can be omitted on the current collector component 310 adjacent to the third conductive structure 600. In this way, the signal collection in the edge region can be guaranteed by the third conductive structure 600, while saving a certain amount of silver paste, so as to achieve a balance between signal collection and cost control.

[0078] In one embodiment, the plurality of edge gate lines 220 include a plurality of first edge gate lines 221 and a plurality of second edge gate lines 222 with opposite polarities; the plurality of current collector components 310 include a plurality of first current collector components 312 and a plurality of second current collector components 313 with opposite polarities; the first current collector components 312 are correspondingly connected to the first edge gate lines 221, and the second current collector components 313 are correspondingly connected to the second edge gate lines 222.

[0079] Please return to the reference. Figure 1 The first edge gate line 221 and the second edge gate line 222 have opposite polarities. When the polarity of the first edge gate line 221 is positive, the polarity of the second edge gate line 222 can be negative, and vice versa. Multiple first edge gate lines 221 and multiple second edge gate lines 222 are alternately arranged in a first direction. The plurality of current collector components 310 includes a first current collector component 312 and a plurality of current collector components 310 with opposite polarities. Each current collector component 310 can be a current collector line 311, meaning the plurality of current collector lines 311 includes a plurality of first current collector lines 311 and a plurality of second current collector lines 311. The first and second current collector lines 311 have opposite polarities; when the first current collector line 311 is positive, the second current collector line 311 can be negative, and vice versa. The plurality of first current collector lines 311 and the plurality of second current collector lines 311 are alternately arranged in a first direction. The polarities of correspondingly connected current collector lines 311 and edge lines 220 are the same.

[0080] In an optional embodiment, the plurality of main gate lines 210 include a plurality of first main gate lines 211 and a plurality of second main gate lines 212 with opposite polarities. The first main gate lines 211 and the second main gate lines 212 have opposite polarities. When the polarity of the first main gate line 211 is positive, the polarity of the second main gate line 212 can be negative, and vice versa. The plurality of first main gate lines 211 and the plurality of second main gate lines 212 are alternately arranged in a first direction. The extension gate member 320 on the current collector 310 has the same polarity as the current collector 310. Corresponding to the current collector 310, there can be a plurality of extension gate members 320, which can also include a plurality of first extension gate members 320 and a plurality of second extension gate members 320, with the first extension gate members 320 having opposite polarities. When the polarity of the first extended gate component 320 is positive, the polarity of the second extended gate component 320 can be negative; conversely, when the polarity of the first extended gate component 320 is negative, the polarity of the second extended gate component 320 can be positive. The first extended gate component 320 is connected to the first main gate line 211, and the second extended gate component 320 is connected to the second main gate line 212, and the polarities of the corresponding extended gate components 320 and the main gate line 210 are the same.

[0081] In one embodiment, within the first edge region 120, a first isolation gap 2211 is formed at the position of the first edge grid line 221 corresponding to the position of the second current collector component 313, and the second current collector component 313 is formed within the corresponding first isolation gap 2211 and spaced apart from the first edge grid line 221; a second isolation gap 2221 is formed at the position of the second edge grid line 222 corresponding to the position of the first current collector component 312, and the first current collector component 312 is formed within the corresponding second isolation gap 2221 and spaced apart from the second edge grid line 222.

[0082] Within the first edge region 120, a first current collector line 311 extends along a first direction, causing interference between the first current collector line 311 and a second edge line 222 extending along a second direction. Since the polarities of the first current collector line 311 and the second edge line 222 are opposite, each second edge line 222 is interrupted at the location of each first current collector line 311 to form a second isolation gap 2221, preventing the opposite polarities of the first current collector line 311 from contacting and short-circuiting with the second edge line 222. Similarly, the second current collector line 311 extends along the first direction, causing interference between the second current collector line 311 and the first edge line 221 extending along the second direction. Since the polarities of the second current collector line 311 and the first edge line 221 are opposite, each first edge line 221 is interrupted at the location of each second current collector line 311 to form a first isolation gap 2211, preventing the opposite polarities of the second current collector line 311 from contacting and short-circuiting with the first edge line 221.

[0083] In one embodiment, the plurality of solder strips 410 include a plurality of first solder strips 411 and a plurality of second solder strips 412, wherein the plurality of first solder strips 411 are configured in a one-to-one correspondence with a plurality of first current collector components 312, and the plurality of second solder strips 412 are configured in a one-to-one correspondence with a plurality of second current collector components 313.

[0084] Furthermore, the battery cell 10 also includes an insulating structure 700. The insulating structure 700 includes a first insulating pad 710 disposed on each of the first main grid lines 211 and used to isolate the first main grid lines 211 from the second solder ribbons 412, and a second insulating pad 720 disposed on each of the second main grid lines 212 and used to isolate the second main grid lines 212 from the first solder ribbons 411.

[0085] Please see Figure 1 and Figure 3 The first solder strip 411 and the second solder strip 412 have opposite polarities. Each first solder strip 411 is correspondingly arranged with each first current collector line 311. Within the main body region 110, the soldering area of ​​each first solder strip 411 can be connected to each first main body grid line 211 through a first reinforcing pad 511. Within the edge region, the soldering area of ​​each first solder strip 411 can be connected to each first edge grid line 221 through a second reinforcing pad 521. Each second solder strip 412 is correspondingly arranged with each second current collector line 311. Within the main body region 110, the soldering area of ​​each second solder strip 412 can be connected to each second main body grid line 212 through a first reinforcing pad 511. Within the edge region, the soldering area of ​​each second solder strip 412 can be connected to each second edge grid line 222 through a second reinforcing pad 521.

[0086] An insulating structure 700 is disposed between solder ribbons 410 and grid lines of different polarities to isolate the solder ribbons 410 and grid lines of opposite polarities, thereby preventing short circuits between the solder ribbons 410 and grid lines. The insulating structure 700 is mainly disposed in the main body area 110 and includes multiple first insulating pads 710 and multiple second insulating pads 720. Specifically, within the main body region 110, the projections of the first main grid line 211 and the second solder ribbon 412 on the plane of the substrate 100 overlap. Each first insulating pad 710 is correspondingly disposed between the first main grid line 211 and the second solder ribbon 412 at a position corresponding to the overlapping region to prevent short circuit between the first main grid line 211 and the second solder ribbon 412. Similarly, the projections of the second main grid line 212 and the first solder ribbon 411 on the plane of the substrate 100 overlap. Each second insulating pad 720 is correspondingly disposed between the second main grid line 212 and the first solder ribbon 411 at a position corresponding to the overlapping region to prevent short circuit between the second main grid line 212 and the first solder ribbon 411, thereby improving the reliability of the solar cell 10.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A solar cell, characterized by, Includes at least two connected battery cells (10), said battery cell (10) comprising: A substrate (100) has a first surface having a main region (110) and a first edge region (120) distributed along a first direction on the side of the main region (110). The first conductive structure (200) includes a plurality of main gate lines (210) spaced apart in the main body region (110) along the first direction and a plurality of edge gate lines (220) spaced apart in the first edge region (120) along the first direction, the main gate lines (210) and the edge gate lines (220) extending along a second direction, the first direction intersecting the second direction; The second conductive structure (300) includes a plurality of current collector gate components (310) spaced apart in the first edge region (120) along the second direction. At least one of the current collector gate components (310) has an extension gate component (320). The current collector gate component (310) extends along the first direction and is correspondingly connected to the edge gate line (220). The extension gate component (320) extends along the first direction from one end of the current collector gate component (310) near the main body region (110) into the main body region (110). The end of the extension gate component (320) away from the current collector gate component (310) is connected to at least one of the main gate lines (210).

2. The solar cell according to claim 1, characterized in that, The battery cell (10) also includes: The welding structure (400) includes a plurality of solder strips (410) located on the side of the first conductive structure (200) away from the substrate (100), the solder strips (410) extending along the first direction, and in the second direction, the plurality of solder strips (410) are arranged in a one-to-one correspondence with the plurality of current collector components (310).

3. The solar cell according to claim 2, characterized in that, The current collector component (310) includes a plurality of current collector lines (311) spaced apart in the second direction; there is a gap between the current collector lines (311) and the corresponding solder strips (410) in the second direction, and the current collector lines (311) are indirectly connected to the corresponding solder strips (410).

4. The solar cell of claim 2, wherein The battery cell (10) also includes: The reinforcing structure (500) includes a first pad component (510) disposed between the main gate line (210) and the solder strip (410); the main gate line (210) is correspondingly connected to the solder strip (410) through the first pad component (510).

5. The solar cell according to claim 4, characterized in that, The first pad component (510) includes a plurality of first reinforcing pads (511) connected to the side of the main gate line (210) away from the substrate (100). The solder strip (410) is connected to the extended gate component (320) via the first reinforcing pad (511).

6. The solar cell according to claim 1, characterized in that, The width of the main grid line (210) is the same as the width of the edge grid line (220); The width of the current collector component (310) is the same as the width of the extension gate component (320); The width of the current collector component (310) is greater than the width of the main grid line (210).

7. The solar cell of claim 1, wherein The first surface of the substrate (100) is further formed with a second edge region (130) distributed along the second direction on the side of the main body region (110). The battery cell (10) also includes: The third conductive structure (600) includes a connecting gate line (610) formed in the second edge region (130); the connecting gate line (610) extends along the first direction; the connecting gate line (610) is connected to each of the edge gate lines (220), and one end of the connecting gate line (610) away from the first edge region (120) extends into the main region (110) and is connected to at least one of the main gate lines (210).

8. The solar cell according to any one of claims 2 to 7, characterized in that, The plurality of edge gate lines (220) include a plurality of first edge gate lines (221) and a plurality of second edge gate lines (222) with opposite polarities; the plurality of current collector components (310) include a plurality of first current collector components (312) and a plurality of second current collector components (313) with opposite polarities; the first current collector component (312) is connected to the first edge gate line (221) and the second current collector component (313) is connected to the second edge gate line (222).

9. The solar cell according to claim 8, characterized in that, Within the first edge region (120), a first isolation gap (2211) is formed at the position of the first edge grid line (221) corresponding to the position of the second current collector component (313), and the second current collector component (313) is formed within the corresponding first isolation gap (2211) and spaced apart from the first edge grid line (221); a second isolation gap (2221) is formed at the position of the second edge grid line (222) corresponding to the position of the first current collector component (312), and the first current collector component (312) is formed within the corresponding second isolation gap (2221) and spaced apart from the second edge grid line (222).

10. The solar cell of claim 8, wherein, The plurality of solder strips (410) include a plurality of first solder strips (411) and a plurality of second solder strips (412), wherein the plurality of first solder strips (411) are configured one-to-one with the plurality of first current collector components (312), and the plurality of second solder strips (412) are configured one-to-one with the plurality of second current collector components (313); the plurality of main grid lines (210) include a plurality of first main grid lines (211) and a plurality of second main grid lines (212) with opposite polarities. The battery cell (10) also includes: The insulation structure (700) includes a first insulating pad (710) disposed on each of the first main grid lines (211) for isolating the first main grid lines (211) from the second solder strip (412) and a second insulating pad (720) disposed on each of the second main grid lines (212) for isolating the second main grid lines (212) from the first solder strip (411).

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