Photovoltaic cell module
By setting multiple grooves in the separator layer of the photovoltaic cell module and filling them with grid lines, combined with solder ribbon connections, the problems of grid line stability and loss were solved, achieving a stable grid line structure and reducing paste loss.
Patent Information
- Application Number
- CN202422946381.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-11-29
AI Technical Summary
In the fabrication of existing photovoltaic cell modules, the stability of the grid lines is greatly affected by the extrusion pressure, and the grid line slurry loss is also significant.
Multiple grid lines are arranged in the grooves of the isolation membrane layer. The first and second grooves are respectively set in the first and second isolation membrane layers, and grid lines are filled in each groove and connected by solder strips to form a stable grid line structure.
It improves the stability of the grid lines, reduces the loss of grid line slurry, and ensures that the grid lines are not easily detached.
Smart Images
Figure CN223694238U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application mainly relates to the field of photovoltaic technology, and particularly relates to a photovoltaic cell module. BACKGROUND
[0002] At present, the main process for preparing grid lines of a photovoltaic cell module is to extrude grid line paste to the front of the photovoltaic cell, and the pressure during extrusion will affect the stability of the grid lines, and the loss of the grid line paste is large. CONTENT OF THE UTILITY MODEL
[0003] The purpose of the present application is to provide a photovoltaic cell module which has a stable grid line structure and can reduce the loss of grid line paste.
[0004] To achieve the above purpose, in a first aspect, the present application provides a photovoltaic cell module, comprising a front substrate, a first separation film layer, a crystalline silicon layer, a second separation film layer and a back substrate which are sequentially stacked from top to bottom; wherein the first separation film layer comprises a plurality of first grooves, and a first grid line is arranged in each first groove, and / or the second separation film layer comprises a plurality of second grooves, and a second grid line is arranged in each second groove.
[0005] In some embodiments, the crystalline silicon layer comprises a plurality of spaced-apart cell units, and each cell unit is provided with a solder strip.
[0006] In some embodiments, the solder strip is arranged between the first separation film layer and the second separation film layer, and connects the plurality of first grid lines and the plurality of second grid lines.
[0007] In some embodiments, the cell unit is composed of a P-doped layer and an N-doped layer.
[0008] In some embodiments, the cell unit comprises a first cell unit and a second cell unit; the P-doped layer in the first cell unit is located on the upper layer of the N-doped layer, and the P-doped layer in the second cell unit is located on the lower layer of the N-doped layer.
[0009] In some embodiments, the spacing between the first grooves is consistent with the spacing between the second grooves.
[0010] In some embodiments, the width of the first grid line is 20um-1mm, and / or the width of the second grid line is 20um-1mm.
[0011] In some embodiments, the thickness of the first grid line is 1um-100um, and / or the thickness of the second grid line is 1um-100um.
[0012] In some embodiments, the front substrate is glass, and / or the back substrate is glass.
[0013] In some embodiments, the first grid lines are made by silver paste spraying, and / or the second grid lines are made by silver paste spraying.
[0014] Compared with the prior art, the present application has the following advantages:
[0015] The present application provides a photovoltaic cell assembly, comprising a front substrate, a first isolation film layer, a crystalline silicon layer, a second isolation film layer and a back substrate which are sequentially stacked from top to bottom; wherein the first isolation film layer comprises a plurality of first grooves, and a first grid line is arranged in each first groove, and / or the second isolation film layer comprises a plurality of second grooves, and a second grid line is arranged in each second groove. The photovoltaic cell assembly can keep the first grid line and the second grid line stable in the grooves, and at the same time, the grid line paste will not easily fall off, so that the loss of the grid line paste can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0016] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this application, illustrate embodiments of the present application, and together with the description serve to explain the principles of the present application. In the drawings:
[0017] Figure 1 is a schematic diagram of a photovoltaic cell assembly 10 provided by an exemplary embodiment of the present application;
[0018] Figure 2 is a schematic diagram of a first groove 107 provided by an exemplary embodiment of the present application.
[0019] Figure 3 is a schematic diagram of a crystalline silicon layer 103 provided by an exemplary embodiment of the present application;
[0020] Figure 4 is a schematic diagram of a solder strip 111 provided by an exemplary embodiment of the present application;
[0021] Figure 5 is a schematic diagram of a cell unit 110 provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some examples or embodiments of the present application, and for those skilled in the art, the present application can also be applied to other similar scenarios without creative labor. Unless it is obvious from the language environment or otherwise stated, the same reference numbers in the drawings represent the same structure or operation.
[0023] As shown in the present application and claims, unless the context clearly indicates otherwise, the words "comprise", "comprising", "include", "including" and / or "contains", "containing" are not used as limiting, but rather as setting forth the presence of the stated steps and elements. In general the terms "include", "including" and "comprising" are used in this specification to mean "including but not limited to".
[0024] In addition, it should be noted that the use of the words "first", "second", and the like, does not imply any particular meaning, but is merely used to distinguish one element from another, unless otherwise indicated by context. In addition, although the terms used in the present application are selected from well-known and commonly used terms from the art, some of the terms mentioned in the specification of the present application can be selected by the applicant according to his or her judgment, and the detailed meanings thereof are described in the relevant parts of the description. In addition, the present application is to be understood not only by the actual terms used, but also by the meanings implied by each term.
[0025] Currently, the main process for preparing the grid lines of the photovoltaic cell assembly is screen printing. Screen printing is to extrude the grid line paste to the front of the photovoltaic cell. If the pressure is too small during extrusion, the grid line will be unstable, and the loss of the grid line paste in printing is large.
[0026] Based on the above problems, the present application provides a photovoltaic cell assembly with a stable grid line structure and capable of reducing the loss of the grid line paste. Specifically, the photovoltaic cell assembly comprises a front substrate, a first isolation film layer, a crystalline silicon layer, a second isolation film layer and a back substrate which are sequentially stacked from top to bottom; wherein the first isolation film layer comprises a plurality of first grooves, and a first grid line is arranged in each first groove, and / or the second isolation film layer comprises a plurality of second grooves, and a second grid line is arranged in each second groove.
[0027] In some embodiments, the crystalline silicon layer comprises a plurality of spaced-apart cell units, and each cell unit is provided with a solder strip.
[0028] In some embodiments, the solder strip is arranged between the first isolation film layer and the second isolation film layer, and connects the plurality of first grid lines and the plurality of second grid lines.
[0029] In some embodiments, the cell unit is composed of a P-doped layer and an N-doped layer.
[0030] In some embodiments, the cell unit comprises a first cell unit and a second cell unit; the P-doped layer in the first cell unit is located on the upper layer of the N-doped layer, and the P-doped layer in the second cell unit is located on the lower layer of the N-doped layer.
[0031] In some embodiments, there is no gap inside the groove of the first separation film layer, and / or there is no gap inside the groove of the second separation film layer.
[0032] In some embodiments, the width of the first grid line is 20 um-1 mm, and / or the width of the second grid line is 20 um-1 mm.
[0033] In some embodiments, the thickness of the first grid line is 1 um-100 um, and / or the thickness of the second grid line is 1 um-100 um.
[0034] In some embodiments, the front substrate is glass, and / or the back substrate is glass.
[0035] In some embodiments, the first grid line is made by silver paste spraying, and / or the second grid line is made by silver paste spraying.
[0036] Embodiment 1
[0037] Figure 1 is a schematic diagram of a photovoltaic cell module 10 provided by an exemplary embodiment of the present application. Referring to Figure 1 , the photovoltaic cell module 10 includes a front substrate 101, a first separation film layer 102, a crystalline silicon layer 103, a second separation film layer 104, and a back substrate 105, which are sequentially stacked from top to bottom, and a plurality of first grid lines 106 disposed in a plurality of first grooves 107 of the first separation film layer 102, and a plurality of second grid lines 108 disposed in a plurality of second grooves 109 of the second separation film layer 104.
[0038] In some embodiments, referring to Figure 2 , the x direction is the length direction of the first separation film layer 102, and the y direction is the width direction along the first separation film layer 102. In the grid line preparation, the plurality of first grooves 107 are spaced apart along the length direction of the first separation film layer 102. The grid line paste is filled into each first groove 107, so that the stable first grid line 106 can be formed.
[0039] It can be seen that the photovoltaic cell module 10, by disposing the plurality of first grid lines 106 in the grooves of the first separation film layer 102, the grid line paste in the first groove 107 is not easy to fall off, and the first grid line 106 can remain stable, thereby reducing the loss of the grid line paste.
[0040] Similarly, the length and width of the second separation film layer 102 can be consistent with the first separation film layer 101. The plurality of second grooves 109 can be spaced apart along the length direction of the second separation film layer 102. The spacing between the second grooves 109 can be consistent with the spacing between the first grooves 106. In the grid line preparation, the grid line paste is filled into each second groove 109, so that the stable second grid line 108 can be formed.
[0041] Further, referring to Figure 3 , the crystalline silicon layer 103 comprises a plurality of spaced-apart battery units 110, and each battery unit 110 is provided with a solder strip 111.
[0042] Specifically, referring to Figure 4 , the solder strip 111 is arranged between the first isolation film layer 102 and the second isolation film layer 104, and connects the plurality of first grid lines 106 and the plurality of second grid lines 107.
[0043] Further, the battery unit 110 is composed of a P-doped layer 1101 and an N-doped layer 1102. Specifically, the battery unit 110 can include a first battery unit 110a and a second battery unit 110b. Figure 4 is a schematic diagram of the battery unit 110 provided by an exemplary embodiment of the present application. Referring to Figure 5 , the P-doped layer 1101 in the first battery unit 110a is arranged on the upper layer of the N-doped layer 1102. While the N-doped layer 1102 in the second battery unit 110b is arranged on the upper layer of the P-doped layer 1101.
[0044] In some embodiments, in the photovoltaic cell assembly 10, the first battery unit and the second battery unit can be arranged alternately in the crystalline silicon layer 103, and the battery units 110 are connected together through the solder strip 111.
[0045] In some embodiments, the interval between the first grooves 107 is consistent with the interval between the second grooves 109.
[0046] Since the interval between the first grooves 107 is consistent with the interval between the second grooves 109, the first grid lines 106 on the first isolation film layer 102 and the second grid lines 108 on the second isolation film layer 104 can be arranged separately, and then the front substrate 101, the first isolation film layer 102, the crystalline silicon layer 103, the second isolation film layer 104 and the back substrate 105 are aligned and spliced in turn, thereby completing the preparation of the photovoltaic cell assembly 10.
[0047] Based on the structure of the photovoltaic cell assembly 10 described above, the first grid lines 106 can be completely filled in the first grooves 107, and the second grid lines 108 can be completely filled in the second grooves 109, so that the first grid lines 106 and the second grid lines 108 can be directly in contact with the solder strip 111 or the battery unit 110, making the structure of the photovoltaic cell assembly 10 more simple, and the first grid lines 106 and the second grid lines 108 can be kept stable.
[0048] In some embodiments, the width of the first grid lines 106 is 20um-1mm, and / or the width of the second grid lines 108 is 20um-1mm.
[0049] In some embodiments, the first grid line 106 has a thickness of 1 um-100 um, and / or the second grid line 108 has a thickness of 1 um-100 um.
[0050] In some embodiments, the front substrate 101 is glass, and / or the back substrate 105 is glass.
[0051] In some embodiments, the first grid line 106 is made by silver paste spraying, and / or the second grid line 108 is made by silver paste spraying.
[0052] Based on the above description, the photovoltaic cell module provided by the embodiments includes, from top to bottom, a front substrate, a first isolation film layer, a crystalline silicon layer, a second isolation film layer, and a back substrate, which are sequentially stacked. The first isolation film layer 102 includes a plurality of first grooves, and a first grid line is arranged in each of the first grooves. The second isolation film layer includes a plurality of second grooves, and a second grid line is arranged in each of the second grooves. The photovoltaic cell module can keep the first grid line and the second grid line stable in the grooves, and the grid line paste is not easy to fall off, so the loss of the grid line paste can be reduced.
[0053] The above description has been made to the basic concept, and it is obvious that the above application disclosure is only used as an example and does not limit the application. Although it is not explicitly stated here, those skilled in the art can make various modifications, improvements and corrections to the application. Such modifications, improvements and corrections are suggested in the application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the application.
[0054] Meanwhile, specific words are used in the application to describe the embodiments of the application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics of one or more embodiments of the application can be properly combined.
[0055] Similarly, it should be noted that, in order to simplify the description of the application and to help understand one or more embodiments, sometimes multiple features are combined into one embodiment, figure or description of it. However, this disclosure method does not mean that the features required by the application are more than the features mentioned in the claims. In fact, the features of the embodiment are less than all the features of the disclosed single embodiment.
[0056] In some embodiments, numbers that describe dimensions, quantities of ingredients, etc. are used. It should be understood that the numbers used in this description of the embodiments are intended, in some examples, to be modified by the modifier "approximately" or "about" in conformance with the numbered parameters as would be recognized by one skilled in the art to have a reasonable amount that the dimension, amount, etc. can vary. Unless otherwise indicated, "approximately" or "about" means ±20% of the value stated. Accordingly, the numerical parameters used in the specification and claims have a reasonable variability that can occur inasmuch as each numerical parameter can and typically does encompass a range of values close to the value it describes. In some embodiments, individual numerical limitations can allow for the inclusion of a specified valid number of significant figures by considering the stated number of significant figures and employing the normal rules of significant figure retention. Notwithstanding that the numerical ranges and parameters setting forth the broadest scope of the application in some embodiments are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, can contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[0057] While the application has been described with reference to the currently preferred embodiments, those skilled in the art will recognize various changes in form and equivalent substitutions of elements without departing from the spirit and scope of the application. Accordingly, the application is not to be limited as described above but is to only be limited as required by the appended claims.
Claims
1. A photovoltaic cell assembly, characterized by, The solar cell module comprises, from top to bottom, a front substrate, a first isolation film layer, a crystalline silicon layer, a second isolation film layer, and a back substrate; the first isolation film layer comprises a plurality of first grooves, and a first grid line is arranged in each of the first grooves; and / or the second isolation film layer comprises a plurality of second grooves, and a second grid line is arranged in each of the second grooves.
2. The photovoltaic cell assembly of claim 1, wherein, The crystalline silicon layer comprises a plurality of spaced-apart cell units, and each cell unit is provided with a solder strip.
3. The photovoltaic cell assembly of claim 2, wherein, The solder strip is arranged between the first isolation film layer and the second isolation film layer, and connects the plurality of first grid lines and the plurality of second grid lines.
4. The photovoltaic cell assembly of claim 2, wherein, Each cell unit is composed of a P-doped layer and an N-doped layer.
5. The photovoltaic cell assembly of claim 4, wherein, The cell units comprise first cell units and second cell units; the P-doped layer in the first cell units is located above the N-doped layer, and the P-doped layer in the second cell units is located below the N-doped layer.
6. The photovoltaic cell assembly of claim 1, wherein, The intervals between the first grooves are consistent with the intervals between the second grooves.
7. The photovoltaic cell assembly of claim 1, wherein, The width of the first grid line is 20 um-1 mm, and / or the width of the second grid line is 20 um-1 mm.
8. The photovoltaic cell module of claim 1, wherein, The thickness of the first grid line is 1 um-100 um, and / or the thickness of the second grid line is 1 um-100 um.
9. The photovoltaic cell module of claim 1, wherein, The front substrate is glass, and / or the back substrate is glass.
10. The photovoltaic cell assembly of claim 1, wherein, The first grid line is made of silver paste spraying, and / or the second grid line is made of silver paste spraying.