Solar cell
By designing a corrosion-resistant isolation glue layer, the problem of corrosion of the isolation glue layer in the etching solution is solved, the anti-wear performance of solar cells is improved, and the use of materials is saved, and production costs are reduced.
Patent Information
- Application Number
- CN202510269638.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-07-22
AI Technical Summary
After some isolation glue layers on the market are eroded in the etching solution for a period of time, many parts are corroded, resulting in the remaining isolation glue layers not being able to provide a wear-proof function in the subsequent process of the solar cell.
An isolation glue layer is provided, with the corrosion rate from edge to center direction in the etching solution, the etching solution is 5-7% alkaline concentration, and the etching temperature is 40-45°C, and the shape and distribution of corrosion-resistant materials such as acrylate resin, isolation glue dots or strips are designed to enhance wear resistance.
The anti-wear capability of the isolation adhesive layer in the subsequent process of solar cell is improved, the use of materials is reduced, and production costs are saved.
Smart Images
Figure CN120358804A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of solar cells, and particularly to a solar cell wafer. Background Art
[0002] The isolation adhesive layer is attached to one side of the solar cell during the manufacturing process of the solar cell. The solar cell contacts with external objects through this isolation adhesive layer, which can reduce the probability of the solar cell being worn; however, some isolation adhesive layers on the market are corroded after being eroded in the etching solution for a period of time, and most parts are corroded, resulting in the remaining isolation adhesive layer not being able to provide a good anti-wear function in subsequent processes.
[0003] Therefore, there are defects in the prior art and improvements are needed. Summary of the Invention
[0004] This application provides a solar cell wafer to solve the problem that some isolation adhesive layers on the market are corroded after being eroded in the etching solution for a period of time, and most parts are corroded, resulting in the remaining isolation adhesive layer not being able to provide a good anti-wear function in subsequent processes.
[0005] In a first aspect, this application provides a solar cell wafer, including a wafer body and an isolation adhesive layer. The isolation adhesive layer is disposed on one side of the wafer body. The corrosion rate of the isolation adhesive layer from the edge to the center direction in the etching solution is less than 0.167 μg / s. The etching solution is a solution with an alkali concentration of 5-7%, and the etching temperature is 40-45°C.
[0006] Optionally, the total area of the isolation adhesive layer accounts for 10%-50% of the total area of the wafer body on the surface where it is located.
[0007] Optionally, the isolation adhesive layer includes a number of isolation adhesive points, or includes a number of isolation strips, or includes a combination of the above two.
[0008] Optionally, the shape of the isolation adhesive point is a regular cylinder, a regular cone, a regular pyramid, a regular prism, or an inverted cylinder, an inverted cone, an inverted pyramid, an inverted prism.
[0009] Optionally, when the isolation adhesive point is a prism, its aspect ratio is 3-10.
[0010] Optionally, the thickness dimension of the isolation adhesive point is 4-60 μm.
[0011] Optionally, the distance between two adjacent isolation adhesive points is 2-5 mm.
[0012] Optionally, the etching solution is sodium hydroxide solution.
[0013] Optionally, the isolation adhesive layer is disposed on an entire surface of the cell body.
[0014] Optionally, the isolation adhesive layer comprises an acrylate resin.
[0015] Optionally, the isolation adhesive layer is disposed on the light-facing surface of the cell body.
[0016] Optionally, the isolation adhesive dots protrude away from the cell body, and the protruding amplitude gradually increases from the edge to the center.
[0017] The above technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:
[0018] By providing a relatively corrosion-resistant isolation adhesive layer in the embodiments of the present application, the isolation adhesive layer can still provide a good ability to reduce scratching and wear in the subsequent processes of the solar cell, which is beneficial to improving the quality of the solar cell. At the same time, there is no need to replenish the isolation adhesive layer midway, saving the use of materials and being beneficial to saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0021] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.
[0022] Figure 1 It is a perspective view of a cell body provided by an embodiment of the present application.
[0023] Figure 2 It is a plan view of a solar cell provided by an embodiment of the present application.
[0024] Figure 3 It is a plan view of a deformed solar cell provided by an embodiment of the present application.
[0025] Figure 4 It is a plan view of another deformed solar cell provided by an embodiment of the present application.
[0026] Description of the reference numerals in the drawings:
[0027] 1. Battery cell body; 2. Isolation adhesive layer; 3. Light-facing surface; 4. Isolation adhesive dots; 5. Isolation adhesive strips. Specific embodiments
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the scope of protection of this application.
[0029] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.
[0030] For ease of description, spatially relative relationship terms may be used in the text to describe the relative positional relationship or movement of one element or feature shown in the figure relative to another element or feature. These relative relationship terms are, for example, "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", "front", "rear", etc. Such spatially relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or attitude change or movement state change, then these directional indications will also change accordingly. For example, an element described as "below other elements or features" or "beneath other elements or features" will subsequently be oriented as "above other elements or features" or "over other elements or features". Therefore, the example term "below" can include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatially relative relationship descriptors used in the text are interpreted accordingly.
[0031] To solve the technical problems in the prior art, this application provides a solar cell, which can provide a relatively corrosion-resistant isolation adhesive layer, so that the isolation adhesive layer can still provide a good anti-wear function in the subsequent processes of the solar cell, which is beneficial to improving the quality of the solar cell. At the same time, there is no need to replenish the isolation adhesive layer midway, saving the use of materials and being beneficial to saving production costs.
[0032] Figure 1-2 A solar cell provided by an embodiment of the present application includes a cell body 1 and a spacer layer 2. The spacer layer 2 is disposed on one surface of the cell body 1. In the present invention, it is disposed on the light-facing surface 3 of the cell body 1 to replace the contact between the cell body 1 and other objects, reducing the scratching and wear between the cell body 1 and other objects, such as a conveyor belt or other cells, and enhancing the anti-wear performance of the cell body 1 during the manufacturing process. This includes, but is not limited to, the case where it can also be disposed on the backlight surface of the cell body 1, which can be specifically set according to the actual situation. Among them, under the condition that the etching temperature is 40 - 45 °C, the corrosion rate of the spacer layer 2 in the etching solution from the edge to the center direction is less than 0.167 μg / s. In an embodiment of the present invention, the etching solution is a sodium hydroxide solution, specifically a solution with an alkali concentration of 5 - 7%. Specifically, it can be a solution with an alkali concentration of 5%, a solution with an alkali concentration of 6%, a solution with an alkali concentration of 7%, or a solution with an alkali concentration that is any value other than the aforementioned three in the range of 5 - 7%. Since the alkalinity is relatively strong, the corrosion rate of the spacer layer 2 is relatively low under such strong alkalinity, that is, the spacer layer 2 has strong corrosion resistance. In an embodiment of the present invention, the etching temperature is 40 - 45 °C, specifically it can be 40 °C, 41 °C, 42 °C, 43 °C, 44 °C, 45 °C, or any temperature value other than the aforementioned temperatures in the range of 40 - 45 °C. Due to process reasons, the cell body 1 needs to be immersed in the solution for a period of time. The following table shows the experimental data of the corrosion rate of the spacer layer 2 at different times and different temperatures:
[0033]
[0034]
[0035] In an embodiment of the present invention, the total area of the spacer layer 2 accounts for 10% - 50% of the total area of the cell body 1 on the surface where it is located. With a better ability to reduce the scratching and wear with external objects such as a conveyor belt, the area ratio is not too large, that is, it is not too small to provide a good ability to reduce scratching and wear, nor too large to cause material waste. Specifically, when the total area of the spacer layer 2 accounts for 35% of the total area of the cell body 1 on the surface where it is located, the effect is the best. As a specific embodiment, the spacer layer 2 can also be disposed on the entire surface of the cell body 1.
[0036] In an embodiment of the present invention, the isolation adhesive layer 2 includes a plurality of isolation adhesive dots 4, and the plurality of isolation adhesive dots 4 are uniformly distributed on the light-facing surface 3 of the battery cell body 1. By being uniformly distributed on one surface of the battery cell body 1, the ability of the battery cell body 1 to reduce scratching and wear on this surface can be effectively improved; the shape of the isolation adhesive dot 4 is preferably a regular cylindrical shape, a regular conical shape, a regular pyramid shape or a regular prism shape, including but not limited to this, and can also be an inverted cylindrical shape, an inverted conical shape, an inverted pyramid shape or an inverted prism shape, and can be specifically set according to actual needs. Please refer to Figure 3-4 , as some other embodiments, the isolation adhesive layer 2 may also only include a plurality of isolation adhesive strips 5, or include a combination of isolation adhesive dots 4 and isolation adhesive strips 5, and can be specifically set according to the actual situation, as long as it satisfies having better corrosion resistance and increasing the ability of the battery cell body 1 to reduce scratching and wear.
[0037] In an embodiment of the present invention, the isolation adhesive dot 4 protrudes away from the battery cell body 1, and the protruding amplitude gradually increases from the edge to the center. With such a structure, after the isolation adhesive dot 4 is soaked in the alkaline solution for a period of time, there is still more material remaining in the middle position due to its relatively thick thickness, so that it can still better replace the battery cell body 1 to contact other objects subsequently.
[0038] As a specific embodiment, when the isolation adhesive dot 4 is a quadrangular prism shape, its aspect ratio is 3 - 10, and the specific ratio can be 3, 4, 5, 6, 7 or any ratio other than the foregoing in 3 - 10; the distance between two adjacent isolation adhesive dots 4 is 2 - 5 mm, and the specific distance value can be 2, 3, 4, 5 or any distance value other than the foregoing in 2 - 5, and can be specifically selected according to the required wear resistance of the light-facing surface 3 of the battery cell body 1 in practice. When the distance between two adjacent isolation adhesive dots 4 is relatively close, the light-facing surface of the battery cell body 1 has better ability to reduce scratching and wear, but more isolation adhesive dots 4 need to be set; when the distance between two adjacent isolation adhesive dots 4 is relatively far, the light-facing surface 3 of the battery cell body 1 has relatively weak ability to reduce scratching and wear, but the number of isolation adhesive dots 4 set is relatively small. When the distance between two adjacent isolation adhesive dots 4 is 3 mm, the effect is the best.
[0039] In an embodiment of the present invention, the thickness dimension of the isolation adhesive dot 4 is 4 - 60 μm, and can be specifically selected according to the required wear resistance of the light-facing surface 3 of the battery cell body 1 in practice. When the isolation adhesive dot 4 is a cylinder, its diameter is 700 μm, its thickness is 20 μm, and the distance between two adjacent isolation adhesive dots 4 is 3 mm, the light-facing surface of the battery cell body 1 has better ability to reduce scratching and wear while setting a relatively small number of isolation adhesive dots 4.
[0040] In an embodiment of the present invention, the isolation adhesive layer 2 of the present invention comprises acrylate resin. Specifically, by mass percentage, it includes 65-75% acrylate resin, 7-13% isobornyl acrylate, 10-20% polyurethane acrylate, 1.5-2.5% transparent polystyrene, and 2-4% mixed initiator, where the mixed initiator is benzophenone, benzoin ether, or a mixture of both.
[0041] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.
[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.
[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.
[0044] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0045] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.
[0046] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.
[0047] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.
[0048] The above is the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.
Claims
1. A solar cell, characterized in that: It includes a battery cell body and an isolation adhesive layer. The isolation adhesive layer is disposed on one surface of the battery cell body. The corrosion rate of the isolation adhesive layer in the etching solution from the edge to the center direction is less than 0.167 μg / s. The etching solution is a solution with an alkali concentration of 5-7%. The etching temperature is 40-45 °C.
2. The solar cell according to claim 1, wherein: The total area of the isolation adhesive layer accounts for 10%-50% of the total area of the battery cell body on the surface where it is located.
3. The solar cell according to claim 1, wherein: The isolation adhesive layer includes a number of isolation adhesive points, or includes a number of isolation strips, or includes a combination of the above two.
4. The solar cell according to claim 3, characterized in that: The shape of the isolation adhesive points is a regular cylindrical shape, a regular conical shape, a regular pyramid shape, a regular prism shape, or an inverted cylindrical shape, an inverted conical shape, an inverted pyramid shape, an inverted prism shape.
5. The solar cell according to claim 4, wherein: When the isolation adhesive point is a prism shape, its aspect ratio is 3-10.
6. The solar cell according to claim 3, wherein: The thickness dimension of the isolation adhesive point is 4-60 μm.
7. The solar cell according to claim 3, wherein: The distance between two adjacent isolation adhesive points is 2-5 mm.
8. The solar cell according to claim 1, characterized in that: The etching solution is a sodium hydroxide solution.
9. The solar cell according to claim 1, wherein: The isolation adhesive layer is disposed on the entire surface of the battery cell body.
10. The solar cell according to claim 1, wherein: The isolation adhesive layer includes acrylate resin.
11. The solar cell according to claim 1, characterized in that: The isolation adhesive layer is disposed on the light-facing surface of the battery cell body.
12. The solar cell according to claim 4, characterized in that: The isolation adhesive points bulge away from the battery cell body, and the amplitude of the bulge gradually increases from the edge to the center.