Solar cell and photovoltaic module
By using base metals as the transport element and silver as the current collector in the solar cell, the problem of high silver consumption in the sub-busbars was solved, achieving cost reduction and efficiency improvement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2026-03-31
AI Technical Summary
In existing solar cells, the secondary grid line material is mainly silver in the front and back electrodes, which leads to high silver consumption and increases the cost of the cell.
Using base metal as the material for the transmission section and silver as the material for the current collector section, the design incorporates a transmission section and multiple current collector sections to ensure good current collection and transmission efficiency.
This reduces the silver loss of the sub-grid lines, thereby reducing the cost of solar cells, while maintaining good current collection and transmission efficiency.
Smart Images
Figure CN224069048U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic technology field especially relates to a solar cell and photovoltaic module. BACKGROUND
[0002] The current solar cell's positive and negative surfaces electrode usually constructs as the grid line structure, and the grid line structure usually includes the vice grid line, and the vice grid line can improve the electric field distribution, optimizes the flow direction of electric charge, improves the output efficiency of cell piece. In the related art, the material of the vice grid line on the positive and negative surfaces of the cell piece is usually silver to ensure the conductivity of the vice grid line. However, the silver consumption of such cell piece is high, resulting in high cost of the cell. SUMMARY
[0003] The utility model discloses a solar cell and photovoltaic module, which can reduce the silver consumption of the vice grid line and reduce the cost of the solar cell.
[0004] To achieve the above object, in a first aspect, the utility model discloses a solar cell, which comprises:
[0005] A cell body; and
[0006] A grid line structure, the grid line structure includes a plurality of vice grid lines arranged along a first direction, at least one vice grid line includes a transmission part and a plurality of current collecting parts, the current collecting part is arranged on the cell body, the current collecting part is arranged along the first direction, and a plurality of current collecting parts are arranged along a second direction, the current collecting part is configured to collect the current on the cell body, the transmission part is connected to a plurality of current collecting parts, the transmission part is arranged along the second direction, and the transmission part is configured to transmit the current of a plurality of current collecting parts.
[0007] The material of the transmission part includes base metal, and the material of the current collecting part includes silver.
[0008] The first direction, the second direction and the thickness direction of the cell body intersect with each other.
[0009] As an optional implementation, in the embodiment of the first aspect of the utility model, the current collecting part at least protrudes from one side of the transmission part in the first direction.
[0010] As an optional implementation, in the embodiment of the first aspect of the utility model, in a plurality of current collecting parts, part of the current collecting parts protrude from one side of the transmission part in the first direction, and the rest of the current collecting parts protrude from the other side of the transmission part in the first direction.
[0011] As an optional implementation, in the embodiment of the first aspect of the utility model, the transmission part has a first side and a second side on both sides in the first direction, and the current collecting part protruding from the first side and the current collecting part protruding from the second side are arranged alternately in the second direction.
[0012] As an optional implementation, in the embodiment of the first aspect of the utility model, the width of the side of the current collecting part adjacent to the transmission part in the second direction is D1, and the width of the side of the current collecting part protruding from the transmission part in the second direction is D2, satisfying D1>D2.
[0013] As an optional implementation, in the embodiment of the first aspect of the utility model, the cross section of the current collecting part perpendicular to the thickness direction of the battery body is configured as a trapezoidal or stepped shape.
[0014] As an optional implementation, in the embodiment of the first aspect of the utility model, the width D1 satisfies: D1≥50μm, and / or, D1≤70μm, and / or,
[0015] The width D2 satisfies: D2≥20μm, and / or, D2≤30μm.
[0016] As an optional implementation, in the embodiment of the first aspect of the utility model, in the first direction, the length of the current collecting part is L1, and the length L1 satisfies: L1≥30μm, and / or, L1≤50μm.
[0017] As an optional implementation, in the embodiment of the first aspect of the utility model, the current collecting part protrudes from the opposite sides of the transmission part in the first direction.
[0018] As an optional implementation, in the embodiment of the first aspect of the utility model, in the first direction, the length of the current collecting part is L2, and the length L2 satisfies: L2≥40μm, and / or, L2≤60μm.
[0019] As an optional implementation, in the embodiment of the first aspect of the utility model, in the second direction, the distance between two adjacent current collecting parts is T, and the distance T satisfies: T≥20μm, and / or, T≤30μm.
[0020] As an optional implementation, in the embodiment of the first aspect of the utility model, the grid line structure further comprises a main grid line, the main grid line is arranged on the battery body, the main grid line is arranged in extension along the first direction, and the transmission part is connected to the main grid line.
[0021] The utility model discloses a solar cell and a photovoltaic module.
[0022] Compared with the prior art, the utility model has the beneficial effects that:
[0023] The solar cell and the photovoltaic module provided by the utility model have the following advantages: the auxiliary grid line comprises a transmission part and a plurality of current collecting parts, the plurality of current collecting parts are used for collecting current on the cell body, the transmission part is used for transmitting current on the plurality of current collecting parts, meanwhile, the material of the transmission part comprises base metal, and the material of the current collecting part comprises silver; on one hand, the current collecting part has better current collecting efficiency, and the transmission part has certain current transmitting efficiency; on the other hand, the material of the transmission part comprises base metal, which can reduce silver consumption of the auxiliary grid line and reduce the cost of the solar cell. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiments will be briefly introduced as follows: obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.
[0025] Figure 1 is the structural schematic diagram of the solar cell disclosed by the first aspect of the embodiment of the application;
[0026] Figure 2 is the three-dimensional structural schematic diagram of the solar cell (only part is shown) disclosed by the first aspect of the embodiment of the application;
[0027] Figure 3 is the first structural schematic diagram of the grid line structure disclosed by the first aspect of the embodiment of the application;
[0028] Figure 4 is the second structural schematic diagram of the grid line structure disclosed by the first aspect of the embodiment of the application;
[0029] Figure 5 is the third structural schematic diagram of the grid line structure disclosed by the first aspect of the embodiment of the application;
[0030] Figure 6 is the fourth structural schematic diagram of the grid line structure disclosed by the first aspect of the embodiment of the application;
[0031] Figure 7 is the fifth structural schematic diagram of the grid line structure disclosed by the first aspect of the embodiment of the application;
[0032] Figure 8is a sixth structural schematic view of the gate line structure disclosed in the first aspect of the embodiments of the present application;
[0033] Figure 9 is a seventh structural schematic view of the gate line structure disclosed in the first aspect of the embodiments of the present application;
[0034] Figure 10 is a structural schematic view of the photovoltaic module disclosed in the second aspect of the embodiments of the present application.
[0035] Icon: 1, solar cell; 10, cell body; 11, gate line structure; 11a, main gate line; 11b, auxiliary gate line; 110, transmission part; 1100, first side; 1101, second side; 111, current collecting part;
[0036] 2, photovoltaic module;
[0037] X, first direction; Y, second direction. DETAILED DESCRIPTION
[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0039] The technical solutions of the present application will be further described below with reference to the embodiments and drawings.
[0040] Please refer to Figure 1 and Figure 2 The first aspect of the embodiments of the present application discloses a solar cell 1, which comprises a cell body 10 and a gate line structure 11. The gate line structure 11 comprises a plurality of auxiliary gate lines 11b arranged at intervals along a first direction X. At least one auxiliary gate line 11b comprises a transmission part 110 and a plurality of current collecting parts 111. The current collecting part 111 is arranged on the cell body 10. The current collecting part 111 is arranged to extend along the first direction X. The plurality of current collecting parts 111 are arranged at intervals along a second direction Y. The current collecting part 111 is configured to collect current of the cell body 10. The transmission part 110 is connected to the plurality of current collecting parts 111. The transmission part 110 is arranged to extend along the second direction Y. The transmission part 110 is configured to transmit current of the plurality of current collecting parts 111. The material of the transmission part 110 comprises a base metal. The material of the current collecting part 111 comprises silver. The first direction X and the second direction Y intersect with the thickness direction of the cell body 10.
[0041] The solar cell 1 provided in the first aspect of the embodiment of the utility model, through make the vice grid line 11b include transmission part 110 and multiple current collecting parts 111, multiple current collecting parts 111 are used to collect the current on the battery main body 10, transmission part 110 is used to transmit the current on multiple current collecting parts 111, simultaneously, also make the material of transmission part 110 include base metal, and make the material of current collecting part 111 include silver, one aspect, because the material of current collecting part 111 adopts silver, can form better ohmic contact with the battery main body 10, can make current collecting part 111 have better current collecting efficiency, and transmission part 110 only plays the role of transmitting the current on current collecting part 111, the material of transmission part 110 adopts base metal, can also guarantee that transmission part 110 has certain current transmission efficiency, satisfies the demand of solar cell 1, on the other hand, the material of transmission part 110 includes base metal, can reduce the silver consumption of vice grid line 11b, reduces the cost of solar cell 1.
[0042] Optionally, the solar cell 1 can be a TOPCon cell (Tunnel Oxide Passivated Contact solar cell), a PERC cell (Passivated Emitter and Rear Cell) or an HJT cell (Heterojunction Technology), and the specific type can be selected according to actual conditions and is not limited in the embodiment.
[0043] It can be understood that the battery main body 10 can refer to a semi-finished product structure before the solar cell 1 is printed with an electrode structure, or can refer to a semi-finished product structure in which the solar cell 1 is printed with a back electrode structure but not printed with a front electrode structure. For example, the battery main body 10 can include a silicon material, a dielectric layer, a front passivation layer and a front anti-reflection layer formed in sequence on the front surface of the silicon material, and a dielectric layer, a back passivation layer and a back anti-reflection layer formed in sequence on the back surface of the silicon material.
[0044] In the embodiment, in order to make the current collecting part 111 have better current collecting efficiency, the material of the current collecting part 111 as a whole generally adopts silver. In other embodiments, the material of the current collecting part 111 can also include silver and other metals that can form better ohmic contact with the battery main body 10.
[0045] Optionally, the transmission portion 110 can be made of base metal, for example, the transmission portion 110 can be made of copper, aluminum, iron or the like, and the material of the transmission portion 110 can also include base metal and silver, for example, the transmission portion 110 can be printed by silver-coated copper paste. The transmission portion 110 can improve the efficiency of the transmission portion 110 in transmitting current, and can also reduce the consumption of silver in the transmission portion 110 and reduce the cost of the solar cell 1.
[0046] Optionally, at least one of the plurality of sub-grid lines 11b includes the transmission portion 110 and the plurality of current collecting portions 111, which means that in the plurality of sub-grid lines 11b of the grid line structure 11, only one of the plurality of sub-grid lines 11b can include the transmission portion 110 and the plurality of current collecting portions 111, or some of the plurality of sub-grid lines 11b (for example, two, three or four of them) can include the transmission portion 110 and the plurality of current collecting portions 111, or each of the plurality of sub-grid lines 11b can include the transmission portion 110 and the plurality of current collecting portions 111.
[0047] In some embodiments, the solar cell body 10 has a front surface and a back surface opposite to each other along the thickness direction of the solar cell body 10, and the grid line structure 11 of the first aspect of the present application can be arranged on the front surface or the back surface, or both the front surface and the back surface.
[0048] Optionally, the grid line structure 11 can be a structure without a main grid line, or a structure with a main grid line, which can be selected according to actual conditions and is not limited in the present embodiment.
[0049] In some embodiments, the grid line structure 11 further includes a main grid line 11a arranged on the solar cell body 10, the main grid line 11a extends along the first direction X, and the transmission portion 110 is connected to the main grid line 11a. The main grid line 11a can serve as a current collecting portion, which is conducive to guiding the current generated by the solar cell 1 out of the solar cell 1.
[0050] Optionally, the number of main grid lines 11a can be one or more, which can be selected according to actual conditions and is not limited in the present embodiment. When the number of main grid lines 11a is more than one, the plurality of main grid lines 11a are arranged at intervals along the second direction Y, and the plurality of main grid lines 11a intersect with the plurality of sub-grid lines 11b, that is, each main grid line 11a is connected to the plurality of sub-grid lines 11b to collect the current of the sub-grid lines 11b on the main grid line 11a.
[0051] In some embodiments, the current collecting portion 111 at least protrudes from one side of the transmission portion 110 in the first direction X.
[0052] Since the grid line structure 11 is usually formed on the battery body 10 by printing (for example, screen printing or inkjet printing, etc.), after the current collecting part 111 is printed, the transmission part 110 is printed on the current collecting part 111, so as to complete the connection between the transmission part 110 and the current collecting part 111. However, during the printing of the transmission part 110, the transmission part 110 may not be in contact with the current collecting part 111 or not in good contact with the current collecting part 111 due to the offset in the first direction X, which affects the efficiency of the current transmission between the transmission part 110 and the current collecting part 111. By making the current collecting part 111 at least protrude from one side of the transmission part 110 in the first direction X, when the printing of the transmission part 110 is offset, the situation that the transmission part 110 is not in contact with the current collecting part 111 or not in good contact with the current collecting part 111 can be reduced, and the overall efficiency of the current transmission between the transmission part 110 and the plurality of current collecting parts 111 is improved.
[0053] Optionally, the current collecting part 111 at least protruding from one side of the transmission part 110 in the first direction X refers to one or more of the plurality of current collecting parts 111 of one sub-grid line 11b, that is, in the plurality of current collecting parts 111 of one sub-grid line 11b, only one current collecting part 111 can at least protrude from one side of the transmission part 110 in the first direction X, or part of the current collecting parts 111 (for example, two, three or four, etc.) can at least protrude from one side of the transmission part 110 in the first direction X, or each current collecting part 111 can at least protrude from one side of the transmission part 110 in the first direction X. In this embodiment, each current collecting part 111 at least protruding from one side of the transmission part 110 in the first direction X will be taken as an example for description.
[0054] In some embodiments, the current collecting part 111 can protrude from one side of the transmission part 110 in the first direction X, or the current collecting part 111 can protrude from both opposite sides of the transmission part 110 in the first direction X, which will be described in detail below.
[0055] The current collecting portion 111 projects from the transmission portion 110 on the first in the direction X side
[0056] Optionally, the current collecting part 111 protruding from one side of the transmission part 110 in the first direction X can include the following two cases: in the plurality of current collecting parts 111, part of the current collecting parts 111 protrude from one side of the transmission part 110 in the first direction X, and the remaining part of the current collecting parts 111 protrude from the other side of the transmission part 110 in the first direction X, or all the current collecting parts 111 protrude from the same side of the transmission part 110 in the first direction X. The following will be described by taking examples.
[0057] In the first example, part of the current collecting portions 111 protrude from one side of the transport portion 110 in the first direction X, and the rest of the current collecting portions 111 protrude from the other side of the transport portion 110 in the first direction X.
[0058] Referring to Figure 3 In some embodiments, among the plurality of current collecting portions, part of the current collecting portions 111 protrude from one side of the transport portion 110 in the first direction X, and the rest of the current collecting portions 111 protrude from the other side of the transport portion 110 in the first direction X.
[0059] In this way, on the one hand, when the printing of the transport portion 110 is offset, the probability of the current collector having better contact with the transport portion 110 can be improved, so that the transport portion 110 and the plurality of current collecting portions 111 have better transmission efficiency. On the other hand, the length of the current collecting portion 111 in the first direction X can be relatively short, the light-shielding area of the current collecting portion 111 can be reduced, the power generation efficiency of the solar cell 1 can be improved, and the total silver consumption of the current collecting portion 111 can be reduced, thereby reducing the cost of the solar cell 1.
[0060] Optionally, along the second direction Y, for the two sides of the current collecting portions 111, the current collecting portions 111 on the two sides can be correspondingly arranged (for example Figure 2 As shown, or can also be alternately arranged.
[0061] For example, as Figure 3 shown, the two sides of the transport portion 110 in the first direction X are respectively a first side 1100 and a second side 1101. Along the second direction Y, the current collecting portions 111 protruding from the first side 1100 are alternately arranged with the current collecting portions 111 protruding from the second side 1101. That is, the two adjacent current collecting portions 111 protrude from different sides of the transport portion 110 in the first direction X.
[0062] In this way, by making the two adjacent current collecting portions 111 protrude from different sides of the transport portion 110 in the first direction X, on the one hand, at least one of the two adjacent current collecting portions 111 can be in full contact with the transport portion 110 when the printing of the transport portion 110 is offset, thereby improving the probability of the current collector having better contact with the transport portion 110, so that the transport portion 110 and the plurality of current collecting portions 111 have better transmission efficiency. On the other hand, the staggered arrangement of the current collecting portions 111 can greatly reduce the light-shielding area of the current collecting portions 111, thereby better improving the power generation efficiency of the solar cell 1.
[0063] In some embodiments, the current collecting portion 111 is configured in a strip shape in a cross section perpendicular to the thickness direction of the cell body 10. That is, the width of the current collecting portion 111 on the side close to the transport portion 110 in the second direction Y is equal to the width of the current collecting portion 111 protruding from the transport portion 110 in the second direction Y.
[0064] In some embodiments, the width of the current collecting portion 111 adjacent to the side of the transmission portion 110 in the second direction Y is equal to the width of the side of the current collecting portion 111 protruding from the transmission portion 110 in the second direction Y, and both widths are D3. The width D3 satisfies D3≥ 15 μm and / or D3≤ 20 μm.
[0065] For example, the width D3 satisfies D3≥ 15 μm. In this way, the current collecting portion 111 can have a sufficient width, so that the current collecting portion 111 has a good ability to collect current.
[0066] Alternatively, for another example, the width D3 satisfies D3≤ 20 μm. In this way, the width of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0067] Alternatively, for another example, the width D3 satisfies 15 μm≤ D3≤ 20 μm. Exemplarily, the width D3 can be 15 μm, 17 μm, or 20 μm, etc.
[0068] In this way, on the one hand, the current collecting portion 111 can have a sufficient width, so that the current collecting portion 111 has a good ability to collect current, and on the other hand, the width of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0069] Since the offset of the printing of the transmission portion 110 is normally distributed, that is, the probability of a smaller offset is higher, and the probability of a larger offset is lower. Please refer to Figure 3 In some embodiments, the width of the current collecting portion 111 adjacent to the side of the transmission portion 110 in the second direction Y is D1, and the width of the side of the current collecting portion 111 protruding from the transmission portion 110 in the second direction Y is D2, and D1> D2 is satisfied. In this way, when the offset of the printing of the transmission portion 110 is small (i.e., a high-probability event), the transmission portion 110 can have a larger contact area with the current collecting portion 111, and when the offset of the printing of the transmission portion 110 is large (i.e., a low-probability event), the transmission portion 110 can also have a certain contact area with the current collecting portion 111, so that the transmission efficiency between the transmission portion 110 and the current collecting portion 111 and the light-shielding area of the current collecting portion 111 and the silver consumption are taken into account.
[0070] Optionally, the cross section of the current collecting portion 111 perpendicular to the thickness direction of the cell body 10 is configured as a trapezoidal shape (as shown in Figure 4 or a stepped shape (as shown in Figure 5 ).
[0071] In some embodiments, the width D1 satisfies D1≥ 50 μm and / or D1≤ 70 μm.
[0072] For example, the width D1 satisfies: D1≥50μm. In this way, the current collecting portion 111 can have a sufficient width, so that the current collecting portion 111 has a better ability to collect current.
[0073] Alternatively, for example, the width D1 satisfies: D1≤70μm. In this way, the width of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0074] Alternatively, for example, the width D1 satisfies: 50μm≤D1≤70μm. Exemplarily, the width D1 can be 50μm, 60μm or 70μm, etc.
[0075] In this way, on the one hand, the current collecting portion 111 can have a sufficient width, so that the current collecting portion 111 has a better ability to collect current, and on the other hand, the width of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0076] In some embodiments, the width D2 satisfies: D2≥20μm, and / or, D2≤30μm.
[0077] For example, the width D2 satisfies: D2≥20μm. In this way, the current collecting portion 111 can have a sufficient width, so that the current collecting portion 111 has a better ability to collect current.
[0078] Alternatively, for example, the width D2 satisfies: D2≤30μm. In this way, the width of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0079] Alternatively, for example, the width D2 satisfies: 20μm≤D2≤30μm. Exemplarily, the width D2 can be 20μm, 25μm or 30μm, etc.
[0080] In this way, on the one hand, the current collecting portion 111 can have a sufficient width, so that the current collecting portion 111 has a better ability to collect current, and on the other hand, the width of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0081] In some embodiments, in the first direction X, the length of the current collecting portion 111 is L1, and the length L1 satisfies: L1≥30μm, and / or, L1≤50μm.
[0082] For example, the width L1 satisfies: L1≥30μm. In this way, the current collecting portion 111 can have a sufficient length, so that the current collecting portion 111 can have a good contact with the transport portion 110 when the printing of the transport portion 110 is offset, and the transport portion 110 and the current collecting portion 111 have a good transmission efficiency, and the current collecting portion 111 has a good ability to collect current.
[0083] Alternatively, for another example, the width L1 satisfies: L1≤50μm. In this way, the length of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0084] Alternatively, for another example, the width L1 satisfies: 30μm≤L1≤50μm. For example, the width L1 can be 30μm, 40μm or 50μm, etc.
[0085] In this way, on the one hand, the current collecting portion 111 can have a sufficient length, so that the current collecting portion 111 can have a good contact with the transport portion 110 when the printing of the transport portion 110 is offset, and the transport portion 110 and the current collecting portion 111 have a good transmission efficiency, and the current collecting portion 111 has a good ability to collect current, and on the other hand, the length of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0086] In some embodiments, in the second direction Y, the distance between two current collecting portions 111 located on the same side is T, and the distance T satisfies: T≥20μm, and / or, T≤30μm.
[0087] For example, the distance T satisfies: T≥20μm. In this way, the distance between the two adjacent current collecting portions 111 can be large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0088] Alternatively, for another example, the distance T satisfies: T≤30μm. In this way, the distance between the two adjacent current collecting portions 111 can not be too large, so that the current generated by the cell body 10 can be better collected by the current collecting portion 111.
[0089] Alternatively, for another example, the distance T satisfies: 20μm≤T≤30μm. For example, the distance T can be 20μm, 25μm or 30μm, etc.
[0090] In this way, on the one hand, the distance between the two adjacent current collecting portions 111 can be large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured, and on the other hand, the distance between the two adjacent current collecting portions 111 can not be too large, so that the current generated by the cell body 10 can be better collected by the current collecting portion 111.
[0091] In the second example, all current collection sections 111 protrude from the same side of the transmission section 110 in the first direction X. This will be described in detail below.
[0092] Please see Figure 6 In some embodiments, all current collectors 111 protrude from the same side of the transmission section 110 in the first direction X. This allows the current collectors 111 to have a relatively short length in the first direction X, reducing the shading area of the current collectors 111, improving the power generation efficiency of the solar cell 1, and reducing the total silver consumption of the current collectors 111, thus lowering the cost of the solar cell 1. On the other hand, it also simplifies the process of printing the current collectors 111.
[0093] The specific design when all current collectors 111 protrude from the same side of the transmission section 110 in the first direction X can be referred to the design when some current collectors 111 protrude from one side of the transmission section 110 in the first direction X, and the remaining current collectors 111 protrude from the other side of the transmission section 110 in the first direction X, which will not be described in detail here.
[0094] The current collecting portion 111 can also project from the transmission portion 110 on both opposite sides in the X direction First direction Figure 7
[0095] Please see Figure 8 In some embodiments, each current collector 111 protrudes from two opposite sides of the transmission section 110 in the first direction X. This ensures that regardless of which side the transmission section 110 is offset towards during printing in the first direction X, the current collector 111 can maintain good contact with the transmission section 110, resulting in good transmission efficiency between the transmission section 110 and the multiple current collectors 111. Alternatively, as another example, only a portion of the multiple current collectors 111 may protrude from the two opposite sides of the transmission section 110 in the first direction X.
[0096] When using digital printing, the maximum offset of the transmission section 110 in the first direction X is typically 20μm-30μm. In some embodiments, the length of the current collector 111 in the first direction X is L2, and the length L2 satisfies: L2≥40μm, and / or, L2≤60μm.
[0097] In one example, the length L2 satisfies: L2≥40μm. In this way, regardless of which side of the first direction X the transmission section 110 is offset during printing, the current collector 111 can make full contact with the transmission section 110, resulting in better transmission efficiency between the transmission section 110 and the multiple current collectors 111.
[0098] In another example, the width L2 satisfies L2 ≤ 60 μm. In this way, the length of the current collecting portion 111 can be prevented from being too large, the light blocking area of the current collecting portion 111 can be reduced, and the power generation efficiency of the solar cell 1 can be ensured.
[0099] In still another example, the width L2 satisfies 40 μm ≤ L2 ≤ 60 μm. Exemplarily, the length L2 can be 40 μm, 50 μm, or 60 μm, etc.
[0100] In this way, on the one hand, the current collecting portion 111 can be in full contact with the transport portion 110 regardless of which side of the first direction X the transport portion 110 is offset when printed, so that the transport efficiency between the transport portion 110 and the plurality of current collecting portions 111 is better, and on the other hand, the length of the current collecting portion 111 can be prevented from being too large, the light blocking area of the current collecting portion 111 can be reduced, and the power generation efficiency of the solar cell 1 can be ensured.
[0101] In some embodiments, in the second direction Y, the distance between two current collecting portions 111 located on the same side is T, and the distance T satisfies T ≥ 20 μm, and / or T ≤ 30 μm.
[0102] For example, the distance T satisfies T ≥ 20 μm. In this way, the distance between the two adjacent current collecting portions 111 can be made larger, the light blocking area of the current collecting portion 111 can be reduced, and the power generation efficiency of the solar cell 1 can be ensured.
[0103] Alternatively, for another example, the distance T satisfies T ≤ 30 μm. In this way, the distance between the two adjacent current collecting portions 111 can be prevented from being too large, so that the current generated by the cell body 10 can be better collected by the current collecting portion 111.
[0104] Alternatively, for another example, the distance T satisfies 20 μm ≤ T ≤ 30 μm. Exemplarily, the distance T can be 20 μm, 25 μm, or 30 μm, etc.
[0105] In this way, on the one hand, the distance between the two adjacent current collecting portions 111 can be made larger, the light blocking area of the current collecting portion 111 can be reduced, and the power generation efficiency of the solar cell 1 can be ensured, and on the other hand, the distance between the two adjacent current collecting portions 111 can be prevented from being too large, so that the current generated by the cell body 10 can be better collected by the current collecting portion 111.
[0106] In some embodiments, the current collecting portion 111 is configured in a strip shape in a cross section perpendicular to the thickness direction of the cell body 10. That is, the width of the current collecting portion 111 on the side close to the transport portion 110 in the second direction Y is equal to the width of the side of the current collecting portion 111 protruding from the transport portion 110 in the second direction Y.
[0107] In some embodiments, the width of the current collecting portion 111 in the second direction Y at the side adjacent to the transfer portion 110 is equal to the width of the side of the current collecting portion 111 protruding from the transfer portion 110 in the second direction Y, and both widths are D3. The width D3 satisfies D3≥15μm and / or D3≤20μm.
[0108] In one example, the width D3 satisfies D3≥15μm. In this way, the current collecting portion 111 can have a sufficient width, so that the current collecting portion 111 has a better ability to collect current.
[0109] In another example, the width D3 satisfies D3≤20μm. In this way, the width of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0110] In yet another example, the width D3 satisfies 15μm≤D3≤20μm. For example, the width D3 can be 15μm, 17μm or 20μm, etc.
[0111] In this way, on the one hand, the current collecting portion 111 can have a sufficient width, so that the current collecting portion 111 has a better ability to collect current, and on the other hand, the width of the current collecting portion 111 can not be too large, so that the light-shielding area of the current collecting portion 111 is reduced, and the power generation efficiency of the solar cell 1 is ensured.
[0112] In other embodiments, the cross section of the current collecting portion 111 perpendicular to the thickness direction of the cell body 10 can also be configured as a trapezoidal shape (as shown in Figure 9 ) or a stepped shape (as shown in Figure 10 ), and specific designs can refer to the design of the side of the current collecting portion 111 protruding from the transfer portion 110 in the first direction X, which will not be repeated here.
[0113] Please refer to , the utility model embodiment second aspect still discloses a photovoltaic module 2, including the solar cell 1 of above-mentioned embodiment first direction X.
[0114] The photovoltaic module 2 provided in the second aspect of the embodiment of the utility model, because the photovoltaal module 2 adopts the solar cell 1 disclosed in the first aspect of the above embodiment, the solar cell 1 sets up the vice grid line 11b as the transmission part 110 and multiple current collecting parts 111, multiple current collecting parts 111 are used to collect the current on the cell main body 10, the transmission part 110 is used to transmit the current on multiple current collecting parts 111, by making the material quality of the transmission part 110 include base metal and silver, and making the material quality of the current collecting part 111 include silver, on the one hand, the current collecting part 111 can have better current collecting efficiency, and the transmission part 110 has certain current transmission efficiency, on the other hand, part of the material quality of the transmission part 110 is base metal, which can reduce the silver consumption of the vice grid line 11b, reduce the cost of the solar cell 1, and thus reduce the cost of the photovoltaic module 2.
[0115] In some embodiments, the photovoltaic module 2 includes a plurality of solar cells 1 connected in series and / or in parallel, and at least one of the solar cells 1 is the solar cell 1 of the first aspect of the embodiment.
[0116] The above has introduced the solar cell and the photovoltaic module disclosed in the embodiment of the utility model in detail, the principle and the implementation mode of the utility model have been described in this paper by applying specific examples, the above embodiment is only used to help understanding the solar cell and the photovoltaic module of the utility model and its core idea; at the same time, for the general technical personnel in the art, according to the idea of the utility model, the specific implementation mode and the application range will have the change, and the above, the content of the specification should not be understood as the limitation of the utility model.
Claims
1. A solar cell, characterized by, The solar cell comprises: a battery body; and a grid line structure comprising a plurality of sub-grid lines arranged in a first direction, at least one of the sub-grid lines comprising a transmission portion and a plurality of current collecting portions, the current collecting portions being arranged on the battery body and extending in the first direction, the current collecting portions being arranged in a second direction, the current collecting portions being configured to collect current on the battery body, the transmission portion being connected to the current collecting portions and extending in the second direction, the transmission portion being configured to transmit current of the current collecting portions; wherein the transmission portion is made of a base metal, and the current collecting portions are made of silver; the first direction, the second direction and a thickness direction of the battery body intersecting with each other. The current collecting portions at least protrude from one side of the transmission portion in the first direction.
2. The solar cell according to claim 1, characterized in that, In the plurality of current collecting portions, some of the current collecting portions protrude from one side of the transmission portion in the first direction, and the rest of the current collecting portions protrude from the other side of the transmission portion in the first direction.
3. The solar cell according to claim 2, characterized in that, 4. The solar cell according to claim 3, wherein the transmission portion has a first side and a second side in the first direction, and in the second direction, the current collecting portions protruding from the first side and the current collecting portions protruding from the second side are arranged alternately. A width of the current collecting portions adjacent to one side of the transmission portion in the second direction is D1, and a width of the current collecting portions protruding from one side of the transmission portion in the second direction is D2, and D1>D2 is satisfied.
5. The solar cell according to claim 3 or 4, characterized in that, The current collecting portions are configured as trapezoidal or stepped in a cross section perpendicular to the thickness direction of the battery body.
6. The solar cell according to claim 5, characterized in that, The width D1 satisfies D1≥50μm, and / or D1≤70μm, and / or 7. The solar cell according to claim 5, characterized in that, The width D2 satisfies D2≥20μm, and / or D2≤30μm. In the first direction, a length of the current collecting portions is L1, and L1≥30μm and / or L1≤50μm is satisfied.
8. The solar cell according to claim 3 or 4, characterized in that, Each of the current collecting portions protrudes from both opposite sides of the transmission portion in the first direction.
9. The solar cell according to claim 2, characterized in that, In the first direction, a length of the current collecting portions is L2, and L2≥40μm and / or L2≤60μm is satisfied.
10. The solar cell according to claim 9, characterized in that, In the second direction, a distance between two adjacent current collecting portions is T, and T≥20μm and / or T≤30μm is satisfied.
11. Solar cell according to any of claims 1 to 4 or 9 to 10, characterized in that The grid line structure further comprises a main grid line arranged on the battery body, the main grid line extending in the first direction, and the transmission portion being connected to the main grid line.
12. Solar cell according to any of claims 1-4 or 9-10, characterized in that, The solar cell comprises any one of claims 1-12.
13. A photovoltaic module, characterized by