Solar cell and photovoltaic module
By setting a reinforcing structure at the connection between the conductive wire and the conductive layer, the problem of easy peeling of the conductive wire is solved, a stable connection between the conductive wire and the conductive layer is achieved, battery damage and short circuits are reduced, and current transmission efficiency is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-03-17
AI Technical Summary
The bonding force between the conductive wire and the conductive layer is weak, making them easy to peel off, which can lead to damage to the battery body and short circuits.
A reinforcing structure is provided at the connection between the conductive wire and the conductive layer, including a first end reinforcing strip, a second end reinforcing strip, and a middle reinforcing strip. These reinforcing structures enhance the connection strength between the conductive wire and the conductive layer and prevent peeling.
It improves the contact effect between the conductive wire and the conductive layer, reduces damage to the battery body and short circuits, and maintains good current transmission performance.
Smart Images
Figure CN224007014U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of solar cell technology, and more particularly to a solar cell and photovoltaic module. Background Technology
[0002] In solar cells, conductive filaments are electrically connected to the cell body by bonding with a conductive layer. However, the bonding force between the conductive filaments and the conductive layer is relatively weak, and the conductive layer can easily peel off from the conductive filaments, forming easy-to-peel points. This can lead to the conductive filaments easily separating from the conductive layer, resulting in damage to the cell body and short circuits. Utility Model Content
[0003] This application discloses a solar cell and photovoltaic module that makes it less likely for the ends of the conductive layer to peel off from the conductive wires, thereby enabling the conductive wires to make better contact with the conductive layer as a whole.
[0004] To achieve the above objectives, in a first aspect, embodiments of this application disclose a solar cell, comprising:
[0005] Battery body;
[0006] A conductive layer is disposed on the surface of the battery body and is in ohmic contact with the battery body;
[0007] A conductive wire, which is stacked on the conductive layer on the side opposite to the battery body and electrically connected to the conductive layer, wherein the length direction of the conductive wire is a first direction; in the first direction, the conductive layer has a first end and a second end disposed opposite to each other, and one end of the conductive wire extends beyond the first end; and
[0008] A reinforcing structure is provided at least partially at the overlap between the first end and the conductive wire, the reinforcing structure being configured to reinforce the connection between the conductive wire and the first end.
[0009] In a possible implementation of the first aspect, at least one corner of the battery body is provided with a chamfered portion; in the first direction, the area of the battery body surface corresponding to the chamfered portion is a chamfered region; a portion of the conductive layer is disposed in the chamfered region;
[0010] The conductive wires are multiple, and the multiple conductive wires are spaced apart along a second direction, which intersects with the first direction. A portion of the conductive wires are disposed on the chamfered area, and these conductive wires are stacked on the conductive layer within the chamfered area.
[0011] In one possible implementation of the first aspect, the reinforcing structure includes a bent section disposed within the chamfered area and extending along the edge of the chamfered portion, the bent section being partially disposed at the overlap between the first end and the conductive wire.
[0012] In a possible implementation of the first aspect, the conductive layer is a conductive seed layer, and there are multiple conductive seed layers. The multiple conductive seed layers are spaced apart along the second direction, and each conductive wire is stacked on the side of each conductive seed layer away from the battery body and is electrically connected to each conductive seed layer.
[0013] The reinforcement structure includes a first end reinforcement strip, which extends along the second direction and sequentially connects to the first ends of a plurality of conductive seed layers. The first end reinforcement strip is partially disposed at the overlap between each first end and each conductive wire.
[0014] In a possible implementation of the first aspect, a portion of the conductive seed layers are disposed in the chamfered region;
[0015] In the first direction, the first end and the chamfered portion are located on the same side or different sides of the battery body;
[0016] When the first end and the chamfered portion are located on the same side of the battery body in the first direction, a portion of the first end reinforcing strip extends into the chamfered area, and the portion of the first end reinforcing strip located in the chamfered area is configured as the bent section.
[0017] In one possible implementation of the first aspect, in the first direction, the other end of the conductive wire extends beyond the second end;
[0018] The reinforcement structure includes a second end reinforcement strip, which extends along the second direction and sequentially connects to the second ends of a plurality of conductive seed layers. The second end reinforcement strip is partially disposed at the overlap between each second end and each conductive wire.
[0019] In a possible implementation of the first aspect, at the point where the first end overlaps with the conductive wire, the first end reinforcement strip is stacked on the side of the conductive wire away from the conductive layer; at the point where the first end reinforcement strip is offset from the conductive layer, the first end reinforcement strip is stacked on the battery body.
[0020] And / or, the first end reinforcement strip is a first adhesive strip;
[0021] And / or, the shortest distance between the first end reinforcement strip and the edge of the battery body is within 10 mm;
[0022] And / or, the thickness of the first end reinforcement strip is 0.01mm to 0.5mm;
[0023] And / or, the width of the first end reinforcement strip in the first direction is 0.1mm to 20mm;
[0024] And / or, at the point where the second end overlaps with the conductive wire, the second end reinforcement strip is stacked on the side of the conductive wire away from the conductive layer; at the point where the second end reinforcement strip is offset from the conductive layer, the second end reinforcement strip is stacked on the battery body.
[0025] And / or, the second end reinforcement strip is a second adhesive strip;
[0026] And / or, the shortest distance between the second end reinforcement strip and the edge of the battery body is within 10 mm;
[0027] And / or, the thickness of the second end reinforcing strip is 0.01mm to 0.5mm;
[0028] And / or, the width of the second end reinforcement strip in the first direction is 0.1mm to 20mm.
[0029] In one possible implementation of the first aspect, the reinforcement structure further includes a central reinforcement strip that extends along the second direction and connects the middle portions of the plurality of conductive seed layers.
[0030] In a possible implementation of the first aspect, at the connection between the central reinforcing strip and each of the conductive seed layers, the central reinforcing strip is stacked on the side of the conductive wire away from the conductive seed layer; at the offset point between the central reinforcing strip and the conductive seed layer, the central reinforcing strip is stacked on the battery body.
[0031] And / or, the central reinforcing strip is a third adhesive strip;
[0032] And / or, the thickness of the central reinforcing strip is 0.01mm to 0.5mm;
[0033] And / or, the width of the central reinforcing strip in the first direction is 0.1mm to 20mm.
[0034] In one possible implementation of the first aspect, at the overlap between the first end and the conductive wire, the reinforcement structure is partially overlapped on the side of the conductive wire away from the conductive layer and extends along a second direction to the surface of the battery body, the second direction intersecting the first direction.
[0035] In one possible implementation of the first aspect, in the first direction, the other end of the conductive wire extends beyond the second end, and the reinforcing structure is at least partially disposed at the overlap between the second end and the conductive wire;
[0036] And / or, the reinforcing structure is at least partially disposed at the midpoint of the conductive layer in the first direction where it overlaps with the conductive wire.
[0037] In a possible implementation of the first aspect, the conductive layer is a conductive seed layer or a conductive film layer;
[0038] And / or, when the conductive layer is a conductive seed layer, in the first direction, the shortest distance between any end of the conductive seed layer and the edge of the battery body is within 2 mm;
[0039] And / or, the cross-section of the conductive wire is triangular, rectangular, circular, semi-circular, or trapezoidal;
[0040] And / or, the battery body is square;
[0041] And / or, the battery body includes a silicon substrate and a doped layer, the doped layer being disposed on the surface of the silicon substrate, and the conductive layer being disposed on the side of the doped layer opposite to the silicon substrate and in ohmic contact with the doped layer.
[0042] Secondly, embodiments of this application disclose a photovoltaic module, including a plurality of solar cells as described in the first aspect; the conductive wires of each solar cell are connected to the conductive wires of another solar cell for electrical connection.
[0043] Compared with the prior art, the beneficial effects of this application are: by setting the reinforcement structure at least partially at the overlap between the first end and the conductive wire, the reinforcement structure is configured to reinforce the connection between the conductive wire and the first end, thereby making it difficult for the conductive wire to peel off from the first end, and thus enabling the conductive wire to make better contact with the conductive layer as a whole, which can maintain a good current transmission effect and reduce damage to the battery body and short circuit. Attached Figure Description
[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0045] Figure 1 This is a schematic diagram of the structure of a solar cell (with a conductive seed layer as the conductive layer) disclosed in an embodiment of this application;
[0046] Figure 2 for Figure 1 The AA section view shown;
[0047] Figure 3 for Figure 1 The BB cross-sectional view shown;
[0048] Figure 4 for Figure 1 The CC section view shown;
[0049] Figure 5 This is a schematic diagram of the structure of a solar cell (with a conductive film layer as the conductive layer) disclosed in an embodiment of this application;
[0050] Figure 6 for Figure 5 The DD cross-sectional view shown;
[0051] Figure 7 This is a schematic diagram of the structure of a photovoltaic module disclosed in an embodiment of this application.
[0052] Explanation of reference numerals in the attached figures:
[0053] 1. Solar cell; 11. Cell body; 111. Chamfered portion; 112. Silicon substrate; 113. Doped layer; 12. Conductive layer; 121. First end; 122. Second end; 13. Conductive filament; 14. Reinforcing structure; 141. Bending section; 142. First end reinforcing strip; 143. Second end reinforcing strip; 144. Middle reinforcing strip; 2. Busbar; Y, First direction; X, Second direction; Z, Thickness direction of cell body; A, Chamfered area. Detailed Implementation
[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0055] In this application, the terms "upper," "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0056] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0057] Furthermore, the terms "set up," "equipped with," "connected," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0058] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.
[0059] The technical solution of this utility model will be described below with reference to the embodiments and accompanying drawings.
[0060] Firstly, referring to Figure 1 and Figure 2 This application discloses a solar cell 1, which includes a cell body 11, a conductive layer 12, a conductive filament 13, and a reinforcing structure 14.
[0061] The conductive layer 12 is disposed on the surface of the battery body 11 and is in ohmic contact with the battery body 11.
[0062] The conductive wire 13 is stacked on the side of the conductive layer 12 away from the battery body 11 and is electrically connected to the conductive layer 12. The length direction of the conductive wire 13 is the first direction Y. In the first direction Y, the conductive layer 12 has a first end 121 and a second end 122 that are disposed opposite to each other, and one end of the conductive wire 13 extends beyond the first end 121.
[0063] The reinforcing structure 14 is at least partially disposed at the overlap between the first end 121 and the conductive wire 13, and the reinforcing structure 14 is configured to reinforce the connection between the conductive wire 13 and the first end 121.
[0064] In this embodiment, the conductive layer 12 of the solar cell 1 is in ohmic contact with the cell body 11. It is understood that the conductive layer 12 is configured to collect the surface current of the cell body 11. Since the conductive wire 13 is stacked on the side of the conductive layer 12 away from the cell body 11 and is electrically connected to the conductive layer 12, the current in the conductive layer 12 is longitudinally transmitted to the conductive wire 13, and the conductive wire 13 then outputs the collected current. It should be noted that the aforementioned longitudinal direction refers to the stacking direction of the conductive wire 13 and the conductive layer 12, that is, the thickness direction Z of the cell body. Conversely, the transverse direction can refer to the length or width direction of the cell body 11.
[0065] Since the conductive layer 12 is a sheet-like or patterned thin film, and its thickness direction is aligned with the thickness direction Z of the battery body, the longitudinal dimension of the conductive layer 12 is smaller than its transverse dimension. For example, the thickness of the conductive layer 12 is smaller than its length. Specifically, in some embodiments, the thickness of the conductive layer 12 is 1 μm to 10 μm, while its length can be 1 mm or more. Accordingly, when the conductive layer 12 is used for longitudinal current transmission, the current transmission path is the same size as the thickness of the conductive layer 12, resulting in a shorter current transmission path. On the other hand, since the longitudinal cross-sectional area of the conductive layer 12 is relatively large, and the resistance of a conductor is inversely proportional to its cross-sectional area, the resistance of the conductive layer 12 is also relatively low when used for longitudinal current transmission. Specifically, the longitudinal cross-section of the conductive layer 12 can refer to the plane formed by the width and length directions of the battery body 11.
[0066] Since the conductive layer 12 transmits current longitudinally, when the conductive wire 13 peels off from the conductive layer 12, the current at the peeled point may not be able to be transmitted longitudinally to the conductive wire 13. In this case, lateral transmission may occur within the conductive layer 12, meaning the current can only be transmitted laterally at the peeled point. It is understandable that because the lateral dimension of the conductive layer 12 is relatively large, the current transmission path is correspondingly long. Furthermore, because the cross-sectional area of the conductive layer 12 is relatively small, its resistance is relatively high when used for lateral transmission. In addition, when the conductive wire 13 peels off from the conductive layer 12, the movement of the conductive wire 13 on the surface of the battery body 11 may also cause damage to the battery body 11 and short circuits.
[0067] Therefore, the solar cell 1 of this application needs to minimize the peeling of the conductive wire 13 from the conductive layer 12. The inventors have discovered that when the conductive wire 13 is subjected to a peeling force, the connection point between the conductive wire 13 and the conductive layer 12 is the first to be affected, making it easier for the conductive wire 13 to peel off from the end of the conductive layer 12. Furthermore, when the end of the conductive layer 12 peels off from the end of the conductive wire 13, the peeling phenomenon may spread to other locations on the conductive layer 12, leading to an increase in the number of peeling sites. Therefore, it is necessary to minimize the peeling of the end of the conductive layer 12 from the conductive wire 13.
[0068] Based on the above analysis, the solar cell 1 has a reinforcement structure 14 at least partially disposed at the overlap between the first end 121 and the conductive wire 13. The reinforcement structure 14 is configured to reinforce the conductive wire 13 and the first end 121. By reinforcing the first end 121 and the conductive wire 13, the first end 121 is less likely to peel off from the conductive wire 13, thereby enabling the conductive wire 13 to make better contact with the conductive layer 12 as a whole. This can maintain a good current transmission effect and reduce damage to the cell body 11 and short circuits.
[0069] It should be noted that the term "reinforcement" refers to enhancing the connection strength between the conductive wire 13 and the conductive layer 12, making the bond between the conductive wire 13 and the conductive layer 12 more secure, so that the conductive wire 13 is less likely to peel off from the conductive layer 12. Correspondingly, the term "reinforcement structure 14" refers to a structure that can enhance the connection strength and bonding effect between the conductive wire 13 and the conductive layer 12. The material of the reinforcement structure 14 can be a polymer material or a metal, and the reinforcement structure 14 can be a dot-like structure, a sheet-like structure, or a strip-like structure. This application embodiment does not limit this.
[0070] The conductive wire will be explained in detail below.
[0071] For example, such as Figure 2 As shown, the cross-section of the conductive wire 13 is triangular. The base of the triangular conductive wire 13 can adhere well to the conductive layer 12. In addition, the triangular conductive wire 13 can significantly reduce the area it occupies on the surface of the battery body 11, thereby reducing the shading area. Moreover, the surface of the triangular conductive wire 13 is equivalent to multiple reflective surfaces. When light shines on the conductive wire 13, the light will be reflected to the effective light-receiving area of the battery body 11, thereby reducing the light energy loss caused by the shading of the conductive wire 13 and improving the utilization rate of sunlight by the solar cell 1.
[0072] As other examples, the cross-section of the conductive wire can also be rectangular, circular, semi-circular, or trapezoidal. These cross-sectional shapes allow the conductive wire to form good contact with the conductive layer and reflect light to the battery body to a certain extent, thereby improving light utilization.
[0073] Optionally, the conductive wire 13 can be made of metals or alloys such as copper, silver, aluminum, aluminum alloy, or copper-clad aluminum.
[0074] The battery itself will be described in detail below.
[0075] Optionally, such as Figure 1 As shown, the battery body 11 is square. The square battery bodies 11 can be closely arranged during module packaging, maximizing the use of the space of the solar panel and reducing the gaps between the battery bodies 11, thereby improving the power generation efficiency per unit area.
[0076] Of course, the shape of the battery body 11 can also be a polygon other than a circle, a semi-circle, or a square.
[0077] Optionally, such as Figures 2 to 4 As shown, the battery body 11 includes a silicon substrate 112 and a doped layer 113. The doped layer 113 is disposed on the surface of the silicon substrate 112, and a conductive layer 12 is disposed on the side of the doped layer 113 away from the silicon substrate 112 and in ohmic contact with the doped layer 113. The silicon substrate 112 can be an N-type silicon substrate or a P-type silicon substrate. The doped layer 113 can be a diffusion layer, such as a boron diffusion layer or a phosphorus diffusion layer. The doped layer 113 can also be a polycrystalline silicon layer, such as a P-type doped polycrystalline silicon layer or an N-type doped polycrystalline silicon layer. The doped layer 113 can also be an amorphous silicon layer, such as a P-type doped amorphous silicon layer or an N-type doped amorphous silicon layer.
[0078] For example, the battery type of the battery body 11 may be a passivated contact solar cell (TOPCon solar cell), a back contact solar cell (BC solar cell), a heterojunction solar cell (HJT solar cell), or an emitter and back passivated solar cell (PERC solar cell).
[0079] The reinforcement structure will be described in detail below.
[0080] In this embodiment of the application, reference is made to the return Figure 1 and Figure 2 At the overlap of the first end 121 and the conductive wire 13, the reinforcing structure 14 is partially overlapped on the side of the conductive wire 13 away from the conductive layer 12 and extends along the second direction X to the surface of the battery body 11, where the second direction X intersects with the first direction Y.
[0081] In some embodiments, the reinforcing structure 14 can be stacked on the side of the conductive wire 13 facing away from the conductive layer 12, so that the conductive wire 13 is in direct contact with the conductive layer 12 as much as possible, thereby improving the current transmission effect between the conductive wire 13 and the conductive layer 12. Other portions of the reinforcing structure 14 extend to the surface of the battery body 11, forming an effect of wrapping the conductive layer 12 and the conductive wire 13, so as to enhance its reinforcement effect on the first end 121 and the conductive wire 13.
[0082] Of course, in other embodiments, when the reinforcing structure is a conductive material, the reinforcing structure can also be layered between the conductive wire and the conductive layer, thereby achieving the connection between the conductive wire and the conductive layer while having a smaller impact on the current transmission effect. It is understood that such conductive materials are, for example, metals or conductive adhesives.
[0083] More specifically, the reinforcing structure 14 can be positioned exactly at the end of the conductive layer 12, or it can be positioned near the end of the conductive layer 12. On the other hand, one of the two directions, the second direction X and the first direction Y, is the length direction of the battery body 11, and the other is the width direction of the battery body 11; that is, the second direction X can be perpendicular to the first direction Y. The angle between the second direction X and the first direction Y can also deviate slightly from 90°, for example, the angle between the second direction X and the first direction Y can be 85°, 86°, 88°, 89°, 91°, or 92°.
[0084] In some embodiments, reference is made to Figure 1 In the first direction Y, the other end of the conductive wire 13 extends beyond the second end 122. That is, in the first direction Y, both ends of the conductive wire 13 extend beyond both ends of the conductive layer 12. This allows the conductive layer 12 to be stacked with the conductive wire 13 at various positions in the first direction Y, thereby enabling longitudinal current transmission at various positions of the conductive layer 12. Considering that the second end 122 of the conductive wire 13 is also easily peeled off from the conductive layer 12, in some embodiments, the reinforcing structure 14 can be at least partially disposed at the overlap between the second end 122 and the conductive wire 13. The reinforcing structure 14 is also configured to reinforce the second end 122 and the conductive wire 13. The reinforcing structure 14 of this application reinforces both the conductive wire 13 with the first end 121 and the second end 122, thereby enabling both ends of the conductive layer 12 to achieve a high-strength connection with the conductive wire 13, resulting in a better bonding effect between the conductive wire 13 and the conductive layer 12. For example, the reinforcing structure 14 of the second end 122 is, for example, a strip structure, a dot structure, or a whole piece structure.
[0085] Of course, this application does not rule out the possibility that the other end of the conductive wire 13 may not extend beyond the second end 122.
[0086] Considering that the middle part of the conductive layer 12 is also easily peeled off from the conductive wire 13, based on this, refer to... Figure 1 In some embodiments, the reinforcing structure 14 may also be at least partially disposed at the overlap between the conductive layer 12 and the conductive wire 13 in the first direction Y. The reinforcing structure 14 is further configured to reinforce the middle portion of the conductive layer 12 and the conductive wire 13 in the first direction Y, thereby improving the bonding effect between the conductive layer 12 and the conductive wire 13. For example, the reinforcing structure 14 in the middle of the conductive layer 12 may be an adhesive strip, adhesive dot, metal strip, or metal dot.
[0087] It should be noted that the middle part of the conductive layer 12 can be any position between the two ends of the conductive layer 12 in the first direction Y.
[0088] In some embodiments, such as Figure 1 As shown, at least one corner of the battery body 11 is provided with a chamfered portion 111. In the first direction Y, the area on the surface of the battery body 11 corresponding to the chamfered portion 111 is a chamfered region A. A portion of the conductive layer 12 is disposed in the chamfered region A. There are multiple conductive wires 13, which are spaced apart along the second direction X, which intersects the first direction Y. A portion of the conductive wires 13 are disposed on the chamfered region A, and these conductive wires 13 are stacked on the conductive layer 12 within the chamfered region A.
[0089] Specifically, the chamfer 111 can make the stress distribution on the edge of the battery body 11 more uniform, reduce stress concentration, thereby improving the mechanical strength of the battery body 11 and reducing the breakage rate during subsequent processing and use. The chamfer 111 can also prevent over-etching of the battery body 11 during the etching process, reducing leakage caused by over-etching. The dimension of the chamfer 111 in the second direction X is 0.1mm to 30mm, which is often larger than the width of the conductive wire 13. In order to improve the current collection effect, a portion of the conductive wires 13 are arranged on the chamfered region A, and these conductive wires 13 are stacked on the conductive layer 12 in the chamfered region A, thereby collecting current in the chamfered region A.
[0090] It should be noted that at least one corner of the battery body 11 is provided with a chamfered portion 111, which can be interpreted as: one or more corners of the battery body 11 are provided with a chamfered portion 111. For example, the battery body 11 is square, and both corners of the battery body 11 on the same side in the first direction Y are provided with chamfered portions 111, or all four corners of the battery body 11 are provided with chamfered portions 111. In addition, a portion of the conductive layer 12 is disposed in the chamfered region, which can be interpreted as: a portion of the multiple conductive layers 12 are disposed in the chamfered region A, or a portion of one conductive layer 12 is disposed in the chamfered region A.
[0091] Furthermore, such as Figure 1 As shown, the reinforcing structure 14 includes a bending section 141, which is disposed within the chamfered region A and extends along the edge of the chamfered portion 111. The bending section 141 is partially disposed at the overlap between the first end 121 and the conductive wire 13. The bending section 141 is configured to reinforce the conductive wire 13 located within the chamfered region A and the first end 121.
[0092] It is understood that the size of the chamfered region A in the first direction Y will vary along the edge of the chamfered portion 111, and correspondingly, the position of the first end 121 of the conductive layer 12 located in the chamfered region A will also vary along the edge of the chamfered portion 111. In this application, the conductive wire 13 located in the chamfered region A is reinforced to the first end 121 by means of a bending segment 141. Since the bending segment 141 extends along the edge of the chamfered portion 111, the bending segment 141 can fit as close as possible to the position of the first end 121, thereby improving the reinforcement effect of the conductive wire 13 and the conductive layer 12 in the chamfered region A.
[0093] It is understandable that the bending segment 141 extends along the edge of the chamfered portion 111, meaning that the shape of the bending segment 141 matches the edge shape of the chamfered portion 111. For example, when the chamfered portion is a rounded chamfer, the bending segment is an arc segment. For another example, refer to... Figure 1 When the chamfer 111 is a beveled chamfer, the bending segment 141 is a beveled line segment.
[0094] In some embodiments, such as Figure 1 As shown, the conductive layer 12 is a conductive seed layer, and there are multiple conductive seed layers. The multiple conductive seed layers are spaced apart along the second direction X. Each conductive wire 13 is stacked on the side of each conductive seed layer away from the battery body 11 and is electrically connected to each conductive seed layer.
[0095] The reinforcement structure 14 includes a first end reinforcement strip 142, which extends along the second direction X and sequentially connects to the first ends 121 of a plurality of conductive seed layers. The first end reinforcement strip 142 is partially disposed at the overlap between each first end 121 and each conductive wire 13. The first end reinforcement strip 142 is configured to reinforce each conductive wire 13 to each first end 121 respectively.
[0096] For ease of understanding, the overlap between the conductive wire 13 and the end of the conductive layer 12 is defined as the point to be reinforced. Multiple conductive wires 13 are overlapped with the ends of multiple conductive layers 12 to form multiple points to be reinforced. In this application, a first end reinforcing strip 142 extends along the second direction X and sequentially connects to the first ends 121 of multiple conductive seed layers. That is, the first end reinforcing strip 142 sequentially connects multiple points to be reinforced, thus allowing multiple points to be reinforced to be reinforced with a single first end reinforcing strip 142. This provides greater processing convenience and better reinforcement effect.
[0097] Furthermore, a portion of the conductive seed layer is disposed in the chamfered region. In the first direction Y, the first end 121 and the chamfered portion 111 are located on the same side or different sides of the battery body 11. When the first end 121 and the chamfered portion 111 are located on the same side of the battery body 11 in the first direction Y, a portion of the first end reinforcing strip 142 extends into the chamfered region. The portion of the first end reinforcing strip 142 located in the chamfered region is configured as a bent section 141, which is configured to reinforce each conductive wire 13 located in the chamfered region A to each first end 121 respectively. The bent section 141 on the first end reinforcing strip 142 facilitates precise reinforcement of the multiple first ends 121 in the chamfered region, thereby improving the bonding effect between the conductive wire 13 and the conductive layer 12 in the chamfered region A.
[0098] Understandably, when the first end reinforcing strip 142 and a chamfered portion 111 are located on the same side of the battery body 11 in the first direction Y, one end of the first end reinforcing strip 142 extends into a bent section 141 in the second direction X. When the first end reinforcing strip 142 and two chamfered portions 111 are located on the same side of the battery body 11 in the first direction Y, both ends of the first end reinforcing strip 142 extend into bent sections 141 in the second direction X. In short, the number of bent sections 141 on the first end reinforcing strip 142 matches the number of chamfered portions 111 on the battery body 11.
[0099] For more details, see [link to relevant documentation]. Figure 2 At the overlap between the first end 121 and the conductive wire 13, the first end reinforcing strip 142 is stacked on the side of the conductive wire 13 facing away from the conductive layer 12. This ensures that the conductive wire 13 is in direct contact with the conductive layer 12 as much as possible when reinforcing the conductive wire 13, resulting in better current transmission. At the offset point between the first end reinforcing strip 142 and the conductive layer 12, the first end reinforcing strip 142 is stacked on the battery body 11. In this way, the first end reinforcing strip 142 wraps the first end 121 and the conductive wire 13 around the surface of the battery body 11. By connecting to the surface of the battery body 11, the first end reinforcing strip 142 enhances its reinforcing effect on the first end 121 and the conductive wire 13.
[0100] It should be noted that, although in Figure 2 In this embodiment, the first end reinforcing strip 142 partially fills the space between the conductive wire 13 and the surface of the battery body 11. However, this is only a partial example of the embodiments of this application. In other examples of this application, the first end reinforcing strip 142 may not fill the space between the conductive wire 13 and the surface of the battery body 11; or, the first end reinforcing strip 142 may only fill a portion of the space between the conductive wire 13 and the surface of the battery body 11.
[0101] To ensure that the entire conductive layer 12 is stacked beneath the conductive wire 13, in the first direction Y, one end of the conductive wire 13 extends beyond the second end 122, meaning both ends of the conductive wire 13 extend beyond both ends of the conductive layer 12, so that current can be longitudinally transmitted to the conductive wire 13 at all locations within the conductive layer 12. However, the position corresponding to the conductive wire 13 and the second end 122 is also prone to peeling. Based on this, referring to... Figure 1 In some embodiments, the reinforcement structure 14 includes a second end reinforcement strip 143. The second end reinforcement strip 143 extends along the second direction X and sequentially connects to the second ends 122 of a plurality of conductive seed layers. The second end reinforcement strip 143 is partially disposed at the overlap between each second end 122 and each conductive wire 13. The second end reinforcement strip 143 is configured to reinforce each conductive wire 13 to each second end 122 respectively. This application uses the second end reinforcement strip 143 extending along the second direction X and sequentially connecting to the second ends 122 of a plurality of conductive seed layers, that is, the second end reinforcement strip 143 sequentially connects to a plurality of points to be reinforced. Therefore, multiple points to be reinforced can be reinforced with a single second end reinforcement strip 143, which has high processing convenience and better reinforcement effect.
[0102] Specifically, refer to Figure 3 At the overlap between the second end 122 and the conductive wire 13, the second end reinforcing strip 143 is stacked on the side of the conductive wire 13 facing away from the conductive layer 12. This ensures that the conductive wire 13 is in direct contact with the conductive layer 12 as much as possible when reinforcing the conductive wire 13, resulting in better current transmission. At the offset point between the second end reinforcing strip 143 and the conductive layer 12, the second end reinforcing strip 143 is stacked on the battery body 11. In this way, the second end reinforcing strip 143 wraps the second end 122 and the conductive wire 13 around the surface of the battery body 11. By connecting to the surface of the battery body 11, the second end reinforcing strip 143 enhances its reinforcing effect on the second end 122 and the conductive wire 13.
[0103] It should be noted that, although in Figure 3 In this embodiment, the second end reinforcing strip 143 partially fills the space between the conductive wire 13 and the surface of the battery body 11; however, this is only a partial example of the embodiments of this application. In other examples of this application, the second end reinforcing strip 143 may not fill the space between the conductive wire 13 and the surface of the battery body 11; or, the second end reinforcing strip 143 may only fill a portion of the space between the conductive wire 13 and the surface of the battery body 11.
[0104] It is understandable that when the second end and the chamfered portion are located on the same side of the battery body in the first direction, a portion of the second end reinforcing strip extends into the chamfered area, and the bent section is the portion of the second end reinforcing strip located within the chamfered area. The bent section is configured to reinforce each conductive wire located within the chamfered area to each of the second ends respectively. The effect of the bent section of the second end reinforcing strip can be referred to the above, and will not be repeated here.
[0105] Optionally, the first end reinforcing strip 142 is a first adhesive strip; the second end reinforcing strip 143 is a second adhesive strip. The adhesive strip is made of materials such as silicone, epoxy resin, or acrylic adhesive. The advantage of the adhesive strip is that it allows for reinforcement of multiple locations in a single application process, simplifying the reinforcement procedure, and it reduces the light-blocking area of the battery body 11 by using highly transparent adhesive. Adhesive application methods include: dispensing via a dispensing valve, screen printing, transfer printing, and inkjet printing.
[0106] Optionally, the shortest distance between the first end reinforcing strip 142 and / or the second end reinforcing strip 143 and the edge of the battery body 11 is within 10 mm, so that the first end reinforcing strip 142 and / or the second end reinforcing strip 143 can better correspond to the position of the end of the conductive layer 12 for reinforcement.
[0107] Optionally, the thickness of the first end reinforcing strip 142 and / or the second end reinforcing strip 143 is 0.01 mm to 0.5 mm, including any value within this thickness range, such as 0.01 mm, 0.1 mm, or 0.5 mm. When the first end reinforcing strip 142 and the second end reinforcing strip 143 meet the above-mentioned thickness range, they not only have a good reinforcement effect but also make the surface of the battery body 11 as flat as possible, which is beneficial to the subsequent encapsulation of the solar cell 1. When the first end reinforcing strip 142 and the second end reinforcing strip 143 are transparent, the first end reinforcing strip 142 and the second end reinforcing strip 143 within the above-mentioned thickness range also have high light transmittance, so as to alleviate the light-blocking problem of the first end reinforcing strip 142 and the second end reinforcing strip 143.
[0108] Optionally, the width of the first end reinforcing strip 142 and / or the second end reinforcing strip 143 in the first direction Y is 0.1mm to 20mm, including any value within this width range, such as 0.1mm, 5mm, 10mm, or 20mm. When the first end reinforcing strip 142 and / or the second end reinforcing strip 143 meet the above-mentioned width range, it has a better reinforcement effect and a smaller shading area on the surface of the battery body 11.
[0109] In some embodiments, referencing the back Figure 1The reinforcing structure 14 also includes a central reinforcing strip 144, which extends along the second direction X and connects the middle portions of multiple conductive seed layers. The central reinforcing strip 144 is configured to reinforce the middle portions of each conductive seed layer in the first direction Y with each conductive wire 13. This application uses a central reinforcing strip 144 extending along the second direction X and sequentially connecting the middle portions of multiple conductive seed layers. In other words, the central reinforcing strip 144 sequentially connects the points to be reinforced in the middle portions of multiple conductive seed layers. Therefore, a single central reinforcing strip 144 can reinforce the points to be reinforced in the middle portions of multiple conductive seed layers, offering greater processing convenience and better reinforcement effect.
[0110] Specifically, such as Figure 4 As shown, at the connection between the central reinforcing strip 144 and each conductive seed layer, the central reinforcing strip 144 is stacked on the side of the conductive wire 13 facing away from the conductive seed layer. This ensures that the conductive wire 13 is in direct contact with the conductive layer 12 as much as possible when reinforcing the conductive wire 13, resulting in better current transmission. At the offset points between the central reinforcing strip 144 and the conductive seed layer, the central reinforcing strip 144 is stacked on the battery body 11. In this way, the central reinforcing strip 144 wraps the middle part of the conductive seed layer and the conductive wire 13 on the surface of the battery body 11. By connecting to the surface of the battery body 11, the central reinforcing strip 144 enhances its reinforcing effect on the middle part of the conductive seed layer and the conductive wire 13.
[0111] It should be noted that, although in Figure 4 In this embodiment, the central reinforcing strip 144 partially fills the space between the conductive wire 13 and the surface of the battery body 11; however, this is only a partial example of the embodiments of this application. In other examples of this application, the central reinforcing strip 144 may not fill the space between the conductive wire 13 and the surface of the battery body 11; or, the central reinforcing strip 144 may only fill a portion of the space between the conductive wire 13 and the surface of the battery body 11.
[0112] Optionally, the central reinforcing strip 144 is a third adhesive strip. The advantages of the adhesive strip have been explained in detail above and will not be repeated here.
[0113] Optionally, the thickness of the central reinforcing strip 144 is 0.01 mm to 0.5 mm, including any value within this range, such as 0.01 mm, 0.1 mm, or 0.5 mm. When the central reinforcing strip 144 meets the above-mentioned thickness range, it not only has a good reinforcement effect but also makes the surface of the battery body 11 as flat as possible, which is beneficial to the subsequent encapsulation of the solar cell 1. When the central reinforcing strip 144 is transparent, the central reinforcing strip 144 within the above-mentioned thickness range also has high light transmittance, thereby reducing the light-blocking problem of the central reinforcing strip 144.
[0114] Optionally, the width of the central reinforcing strip 144 in the first direction Y is 0.1mm to 20mm, including any value within this width range, such as 0.1mm, 10mm, or 20mm. When the central reinforcing strip 144 meets the above-mentioned width range, it has a better reinforcement effect and a smaller area of obstruction on the surface of the battery body 11.
[0115] The conductive layer will be described in detail below.
[0116] Optionally, the conductive layer 12 is a conductive seed layer or a conductive film layer.
[0117] Reference Figure 1 The conductive seed layer can be a metal seed layer, which can be disposed on a local area of the surface of the battery body 11, such as a metal seed layer on a passivated contact solar cell. Furthermore, the metal seed layer can be a patterned seed layer.
[0118] Furthermore, when the conductive layer is a conductive seed layer, in the first direction Y, the shortest distance between any end of the conductive seed layer and the edge of the battery body 11 is within 2mm, so that the conductive seed layer can be as close as possible to the edge of the battery body 11, thereby better collecting the current on the surface of the battery body 11.
[0119] More in detail, such as Figure 5 and Figure 6 As shown, the conductive film layer can be a transparent metal oxide layer, such as indium tin oxide (ITO), fluorine-doped tin oxide (FTO), or aluminum-doped zinc oxide (AZO). The conductive film layer can cover the entire surface or a portion of the surface of the battery body 11, for example, a transparent metal oxide layer on a heterojunction solar cell 1. Figure 5 In the illustration, for ease of demonstration, the conductive film layer (conductive layer 12) covers a portion of the surface of the battery body 11 and its outline is represented by dashed lines. It can be understood that the conductive film layer may also cover the entire surface of the battery body 11, meaning the conductive film layer has the same shape as the surface of the battery body 11.
[0120] Secondly, such as Figure 7 As shown in the figure, this application discloses a photovoltaic module including a plurality of solar cells 1 as described in the first aspect. The conductive wire 13 of each solar cell 1 is connected to the conductive wire 13 of another solar cell 1 for electrical connection.
[0121] It should be noted that the term "electrical connection" can refer to series and / or parallel connections. For example, the positive conductive wire 13 of one solar cell 1 is connected in series with the negative conductive wire 13 of another solar cell 1 via a busbar 2, and the connection method may be welding, etc. As another example, the conductive wire 13 of one solar cell 1 is connected in parallel with the same polarity conductive wire 13 of another solar cell 1.
[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A solar cell, characterized by, The battery body comprises: a battery body; a conductive layer arranged on the surface of the battery body and in ohmic contact with the battery body; a conductive wire laminated on one side of the conductive layer away from the battery body and electrically connected with the conductive layer, the length direction of the conductive wire being the first direction; in the first direction, the conductive layer has oppositely arranged first and second ends, and one end of the conductive wire exceeds the first end; and a reinforcing structure arranged at least partially at the lamination of the first end and the conductive wire, the reinforcing structure being configured to reinforce the connection of the conductive wire and the first end.
2. The solar cell according to claim 1, characterized in that, At least one corner of the battery body is provided with a chamfered portion; in the first direction, the area of the battery body surface corresponding to the chamfered portion is a chamfered area; part of the conductive layer is arranged in the chamfered area; The conductive wire is a plurality of conductive wires, and the plurality of conductive wires are arranged in the second direction; the second direction intersects the first direction; a part of the number of conductive wires is arranged on the chamfered area, and this part of the conductive wire is laminated on the conductive layer in the chamfered area.
3. The solar cell according to claim 2, characterized in that, The reinforcing structure comprises a bending segment, the bending segment is arranged in the chamfered area, and the bending segment extends along the edge of the chamfered portion, and the bending segment is partially arranged at the lamination of the first end and the conductive wire.
4. The solar cell according to claim 3, characterized in that, The conductive layer is a conductive seed layer, and the conductive seed layer is a plurality of conductive seed layers, and the plurality of conductive seed layers are arranged in the second direction; each conductive wire is laminated on one side of each conductive seed layer away from the battery body and is electrically connected with each conductive seed layer; The reinforcing structure comprises a first end reinforcing strip, the first end reinforcing strip extends in the second direction and sequentially connects the first ends of a plurality of conductive seed layers, and the first end reinforcing strip is partially arranged at the lamination of each first end and each conductive wire.
5. The solar cell according to claim 4, characterized in that, A part of the number of conductive seed layers is arranged in the chamfered area; In the first direction, the first end and the chamfered portion are located on the same side or different sides of the battery body; When the first end and the chamfered portion are located on the same side of the battery body in the first direction, part of the first end reinforcing strip extends into the chamfered area, and the part of the first end reinforcing strip located in the chamfered area is configured as the bending segment.
6. The solar cell according to claim 4, characterized in that, In the first direction, the other end of the conductive wire exceeds the second end; The reinforcing structure comprises a second end reinforcing strip, the second end reinforcing strip extends in the second direction and sequentially connects the second ends of a plurality of conductive seed layers, and the second end reinforcing strip is partially arranged at the lamination of each second end and each conductive wire.
7. The solar cell according to claim 6, characterized in that At the lamination of the first end and the conductive wire, the first end reinforcing strip is laminated on the side of the conductive wire away from the conductive layer; at the offset of the first end reinforcing strip and the conductive layer, the first end reinforcing strip is laminated on the battery body; And / or, the first end reinforcing strip is a first adhesive strip; And / or, the shortest distance between the first end reinforcing strip and the edge of the battery body is within 10mm; And / or, the thickness of the first end reinforcing strip is 0.01mm-0.5mm; And / or, the width of the first end reinforcing strip in the first direction is 0.1mm-20mm; And / or, at the second end and the lamination of the conductive wire, the second end reinforcing strip is laminated on the side of the conductive wire away from the conductive layer; at the second end reinforcing strip and the conductive layer, the second end reinforcing strip is laminated on the battery body; And / or, the second end reinforcing strip is a second adhesive strip; And / or, the shortest distance between the second end reinforcing strip and the edge of the battery body is within 10mm; And / or, the thickness of the second end reinforcing strip is 0.01mm-0.5mm; And / or, the width of the second end reinforcing strip in the first direction is 0.1mm-20mm.
8. The solar cell according to claim 4, characterized in that, The reinforcing structure further comprises a middle reinforcing strip, which extends along the second direction and connects the middle part of the plurality of conductive seed layers.
9. The solar cell according to claim 8, characterized in that, At the connection between the middle reinforcing strip and each conductive seed layer, the middle reinforcing strip is laminated on the side of the conductive wire away from the conductive seed layer; at the middle reinforcing strip and the conductive seed layer, the middle reinforcing strip is laminated on the battery body; And / or, the middle reinforcing strip is a third adhesive strip; And / or, the thickness of the middle reinforcing strip is 0.01mm-0.5mm; And / or, the width of the middle reinforcing strip in the first direction is 0.1mm-20mm.
10. The solar cell according to claim 1, characterized in that, At the first end and the lamination of the conductive wire, the local part of the reinforcing structure is laminated on the side of the conductive wire away from the conductive layer and extends to the surface of the battery body along the second direction, which intersects the first direction.
11. The solar cell according to claim 1, characterized in that, In the first direction, the other end of the conductive wire beyond the second end, the reinforcing structure is at least partially arranged at the lamination of the second end and the conductive wire; And / or, the reinforcing structure is at least partially arranged at the lamination of the middle part of the conductive layer in the first direction and the conductive wire.
12. The solar cell according to any one of claims 1 to 3, 10 or 11, characterized in that, The conductive layer is a conductive seed layer or a conductive film layer; And / or, when the conductive layer is a conductive seed layer, in the first direction, the shortest distance between any end of the conductive seed layer and the edge of the battery body is within 2mm; And / or, the cross section of the conductive wire is triangular, rectangular, circular, semicircular or trapezoidal; And / or, the battery body is square; And / or, the battery body comprises a silicon substrate and a doped layer, the doped layer is arranged on the surface of the silicon substrate, and the conductive layer is arranged on the side of the doped layer away from the silicon substrate and in ohmic contact with the doped layer.
13. A photovoltaic module, characterized by A plurality of solar cells as claimed in any one of claims 1 to 12; the conductive wire of each solar cell is connected with the conductive wire of another solar cell to be electrically connected.