Metal interconnection strip, solar cell and photovoltaic module
By adding a reversible water-discolored layer to the metal interconnection strip, the problem of water vapor intrusion detection of photovoltaic modules is solved, and rapid and accurate detection and maintenance are achieved, reducing power generation losses.
Patent Information
- Application Number
- CN202421024257.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-11
AI Technical Summary
Photovoltaic modules are easily invaded by water vapor during use, and the prior art is difficult to quickly and accurately detect water vapor invasion, resulting in loss of power generation.
A metal interconnect strip is designed to include a connection area for connecting to the cell and a detection area with a reversible water-discoloration layer. When the ambient humidity changes, the color of the reversible water-distorted layer will change accordingly, making it easier to detect water vapor intrusion.
Through the color change of the reversible water-distorted layer of the metal interconnection strip, the location and degree of water vapor intrusion can be accurately judged, and timely reminded and repaired, reducing the power generation loss of photovoltaic modules.
Smart Images
Figure CN222621503U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, in particular to a metal interconnection strip, a solar cell and a photovoltaic assembly. Background Art
[0002] In the photovoltaic field, due to the low output voltage of a single solar cell, it is generally necessary to connect multiple solar cells in series and in parallel and then tightly seal them into photovoltaic modules. During the use of photovoltaic modules, water vapor will invade from all sides of the modules. If the intrusion location cannot be found in time and repaired or replaced, it will lead to the loss of overall power generation of the photovoltaic modules. In the prior art, the solution to the above problem is to conduct sampling tests in the early stage of product and material development or during mass production, and determine whether there are risks through IEC standard tests. The traditional technology has a long testing cycle, and the sampling test is random and cannot be fully monitored. Utility Model Content
[0003] Based on this, it is necessary to provide a metal interconnection strip. The metal interconnection strip of the utility model can be used to prepare photovoltaic modules, and can timely and accurately determine whether environmental water vapor invades the interior of the photovoltaic module and the degree of invasion during the use of the photovoltaic module, reduce and avoid damage to the entire photovoltaic module, and improve the service life and power generation efficiency of the photovoltaic module.
[0004] An embodiment of the present application provides a metal interconnection strip.
[0005] A metal interconnection strip comprises a connection area for connecting to a battery cell and a detection area outside the connection area, wherein the detection area has a reversible hydrochromic layer, which can change color when exposed to water, and the color of the reversible hydrochromic layer is different when the environmental humidity is different.
[0006] In some embodiments, when the detected humidity of the environment exceeds a first preset humidity value, the reversible water-discoloring layer changes from the original color to the first color;
[0007] When the detected humidity of the environment exceeds a second preset humidity value, the reversible water-discoloring layer changes from a first color to a second color, the original color, the first color and the second color are all different, and the second preset humidity value is greater than the first preset humidity value.
[0008] In some embodiments, the original color of the reversible water-chromic layer is bright red, the first color is yellow, and the second color is light yellow.
[0009] In some embodiments, the first preset humidity value is 60%. When the environmental detected humidity is greater than or equal to 60%, the reversible water-discoloring layer changes from the original color to the first color.
[0010] In some embodiments, the second preset humidity value is 90%. When the environmental detected humidity is greater than or equal to 90%, the reversible water-discoloring layer changes from the first color to the second color.
[0011] In some embodiments, the metal interconnection strip includes a metal substrate and a solder layer, the detection area on the metal substrate is coated with the reversible water-discoloring layer, and the area outside the detection area on the metal substrate is coated with the solder layer to form the connection area.
[0012] In some embodiments, the metal substrate is a copper substrate.
[0013] In some embodiments, the metal substrate is in a cylindrical or strip-shaped structure.
[0014] An embodiment of the present application also provides a solar cell.
[0015] A solar cell comprises a plurality of cell sheets and metal interconnection bars, wherein adjacent cell sheets are connected via the plurality of metal interconnection bars, wherein the metal interconnection bars are connected to corresponding positions of the corresponding cell sheets via connection regions.
[0016] An embodiment of the present application also provides a solar cell.
[0017] A photovoltaic assembly comprises the solar cell and a packaging component, wherein the solar cell is packaged by the packaging component.
[0018] The metal interconnection bar of the present application, by adding a reversible water-discoloring layer, the reversible water-discoloring layer can deepen in color according to the increase in humidity, and when the humidity exceeds a specific value, the reversible water-discoloring layer can change color. The solar cells in the photovoltaic module are connected through the above-mentioned metal interconnection bar, and the color change of the reversible water-discoloring layer can be used to identify whether there is water vapor intrusion in the photovoltaic module, and timely remind the operator to deal with it to avoid power generation losses, thereby reducing the reliability risk of the photovoltaic module. When water vapor invades the interior of the photovoltaic module, the surface of the metal interconnection bar contacts the water vapor and reacts quickly. The deeper the degree of water vapor intrusion, the higher the humidity rises, and the color of the reversible water-discoloring layer on the metal interconnection bar deepens. Therefore, when the color of the reversible water-discoloring layer on any metal interconnection bar changes, it can accurately determine the specific location and degree of water vapor intrusion without reducing the transmittance of sunlight and the power generation efficiency of the photovoltaic module, so that the operator can replace or repair the severely damaged photovoltaic module in time, reducing the impact on the overall power generation of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.
[0020] In order to more completely understand the present application and its beneficial effects, the following description will be made in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.
[0021] Figure 1 This is a schematic diagram of a metal interconnection strip according to an embodiment of the utility model;
[0022] Figure 2 This is a schematic diagram of the connection status between the metal interconnection strip and the battery cell according to an embodiment of the utility model.
[0023] Description of Reference Numerals
[0024] 10. Metal interconnection strip; 100. Metal substrate; 200. Solder layer; 20. Battery cell. DETAILED DESCRIPTION
[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0029] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0031] The embodiment of the present application provides a metal interconnection bar 10 to solve the problem in the prior art that it is inconvenient to detect water vapor intrusion into a photovoltaic module during use and the detection cycle is long. The metal interconnection bar 10 will be described below in conjunction with the accompanying drawings.
[0032] The metal interconnection strip 10 provided in the embodiment of the present application is exemplary, see Figure 1 As shown, Figure 1The schematic diagram of the structure of the metal interconnection bar 10 provided in the embodiment of the present application. The metal interconnection bar 10 of the present application can be used to detect whether water vapor has invaded the photovoltaic module and the extent of the invasion during use, so that the operator can accurately determine the specific location of the water vapor invading the photovoltaic module, and can replace or repair the seriously damaged photovoltaic module in time to reduce the impact on the overall power generation of the photovoltaic module.
[0033] In order to more clearly illustrate the structure of the metal interconnection bar 10 , the metal interconnection bar 10 will be introduced below with reference to the accompanying drawings.
[0034] For example, see Figure 1 As shown, Figure 1 The schematic diagram of the structure of the metal interconnection bar 10 provided in the embodiment of the present application.
[0035] A metal interconnection bar 10 includes a connection area for connecting to a battery cell 20 and a detection area outside the connection area. The detection area has a reversible water-discoloring layer. The reversible water-discoloring layer can change color when exposed to water, and the color of the reversible water-discoloring layer is different when the humidity of the environment is different. The metal interconnection bar 10 of the present application can be used for connecting adjacent battery cells 20.
[0036] The metal interconnection bar 10 of the present application is added with a reversible water-discoloring layer, and the color of the reversible water-discoloring layer can deepen as the humidity rises. When the humidity exceeds a specific value, the reversible water-discoloring layer can change color. Based on the color change of the reversible water-discoloring layer on the metal interconnection bar 10, it is convenient for operators to observe which one or several metal interconnection bars 10 have undergone local color changes, determine the location of water vapor intrusion in the photovoltaic module, and facilitate maintenance and replacement by operators.
[0037] In some of the embodiments, when the detected humidity of the environment exceeds a first preset humidity value, the reversible water-discoloring layer changes from an original color to a first color.
[0038] When the detected humidity of the environment exceeds a second preset humidity value, the reversible water-discoloring layer changes from the first color to the second color, the original color, the first color and the second color are all different, and the second preset humidity value is greater than the first preset humidity value.
[0039] In some embodiments, the original color of the reversibly water-chromic layer is bright red. The first color is yellow. The second color is light yellow. It is not difficult to understand that in other specific examples, the original color, the first color, and the second color can be other different colors, which can be determined according to the material of the reversibly water-chromic layer.
[0040] In some of the embodiments, the first preset humidity value is 60%. When the environmental detected humidity is greater than or equal to 60%, the reversible water-discoloring layer changes from the original color to the first color.
[0041] In some embodiments, the second preset humidity value is 90%. When the environmental detected humidity is greater than or equal to 90%, the reversible water-discoloring layer changes from the first color to the second color.
[0042] For example, in a specific example, the preparation material of the reversible water-chromic layer is an inorganic hygrochromic material, and the inorganic hygrochromic material includes cobalt salt elements.
[0043] For another example, in a specific example, the preparation material of the reversible water-chromic layer is an organic hygrochromic material. When the air humidity reaches a certain value, the structure of the organic hygrochromic material itself changes, thereby selectively changing the absorption of visible light, resulting in changes in color and hue. When the humidity returns to its original state, its color will be restored at the same time. The organic hygrochromic materials used are mainly some organic dyes, and some hygroscopic agents and sensitizers need to be added to improve the sensitivity of the color change or the color change effect. The organic hygrochromic materials involved are mainly quinone, phthalide, fluorane, and triphenylmethane organic dyes, and the hygroscopic agents are mostly chlorides or bromides of alkaline earth metals. For example, when the mass ratio is m(cresol red):m(boric acid):m(silica gel)=1:100:150, the moisture-sensitive material prepared from cresol red, boric acid and silica gel has a bright red reversible water-chromic layer when dry; when the humidity is greater than or equal to 60%, the reversible water-chromic layer turns yellow with sharp color change and bright color; when the humidity continues to increase to 90%, the reversible water-chromic layer turns light yellow; when the humidity continues to decrease to less than 60%, the reversible water-chromic layer returns to bright red.
[0044] In some embodiments, the metal interconnection bar 10 includes a metal substrate 100 and a solder layer 200. The detection area on the metal substrate 100 is coated with a reversible water-discoloring layer. The area outside the detection area on the metal substrate 100 is coated with a solder layer 200 to form a connection area. The reversible water-discoloring layer is not shown in the drawings.
[0045] In some embodiments, the metal substrate 100 is a copper substrate.
[0046] In some embodiments, the metal substrate 100 is cylindrical or strip-shaped. Figure 1 As shown, the radial cross section of the metal substrate 100 is circular. It is not difficult to understand that in other specific examples, the radial cross section of the metal substrate 100 can also be other shapes, which can be set according to actual needs.
[0047] An embodiment of the present application also provides a solar cell.
[0048] A solar cell includes a plurality of solar cells 20 and metal interconnection bars 10. Adjacent solar cells 20 are connected by a plurality of metal interconnection bars 10. Figure 2 As shown, Figure 2 Schematic diagram of the connection state of the metal interconnection bar 10 and the battery cell 20 according to an embodiment of the present invention. The metal interconnection bar 10 is connected to the corresponding position of the corresponding battery cell 20 through the connection area.
[0049] An embodiment of the present application also provides a solar cell.
[0050] A photovoltaic assembly includes a solar cell and a packaging component. The solar cell is packaged by the packaging component.
[0051] The solar cell 20 in the photovoltaic module of the present application is connected through the above-mentioned metal interconnection bar 10, and the color change of the reversible water-discoloring layer can be used to identify whether there is water vapor intrusion into the photovoltaic module, and the operating personnel can be reminded to deal with it in time to avoid power generation loss, thereby reducing the reliability risk of the photovoltaic module. When water vapor invades the interior of the photovoltaic module, the surface of the metal interconnection bar 10 contacts the water vapor and reacts quickly. The deeper the water vapor intrusion, the higher the humidity rises, and the color of the reversible water-discoloring layer on the metal interconnection bar 10 changes. Therefore, when the color of the reversible water-discoloring layer on any metal interconnection bar 10 changes, the specific location and degree of water vapor intrusion can be accurately determined without reducing the transmittance of sunlight and the power generation efficiency of the photovoltaic module, so that the operating personnel can replace or repair the severely damaged photovoltaic modules in time to reduce the impact on the overall power generation of the photovoltaic module.
[0052] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0054] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A metal interconnection strip (10), characterized in that: It comprises a connection area for connecting to a battery sheet (20) and a detection area outside the connection area, wherein the detection area has a reversible hydrochromic layer, the reversible hydrochromic layer can change color when in contact with water, and the color of the reversible hydrochromic layer is different when the humidity of the environment detected is different.
2. The metal interconnection strip (10) according to claim 1, characterized in that: When the detected humidity of the environment exceeds a first preset humidity value, the reversible water-discoloring layer changes from the original color to the first color; When the detected humidity of the environment exceeds a second preset humidity value, the reversible water-discoloring layer changes from a first color to a second color, the original color, the first color and the second color are all different, and the second preset humidity value is greater than the first preset humidity value.
3. The metal interconnection strip (10) according to claim 2, characterized in that: The original color of the reversible water-discoloring layer is bright red, the first color is yellow, and the second color is light yellow.
4. The metal interconnection strip (10) according to claim 2, characterized in that: The first preset humidity value is 60%. When the environmental detected humidity is greater than or equal to 60%, the reversible water-discoloring layer changes from the original color to the first color.
5. The metal interconnection strip (10) according to claim 2, characterized in that: The second preset humidity value is 90%. When the environmental detected humidity is greater than or equal to 90%, the reversible water-discoloring layer changes from the first color to the second color.
6. The metal interconnection strip (10) according to any one of claims 1 to 5, characterized in that: The metal interconnection strip (10) comprises a metal substrate (100) and a solder layer (200), wherein a detection area on the metal substrate (100) is coated with the reversible water-discoloring layer, and an area outside the detection area on the metal substrate (100) is coated with the solder layer (200) to form the connection area.
7. The metal interconnection strip (10) according to claim 6, characterized in that: The metal substrate (100) is a copper substrate.
8. The metal interconnection strip (10) according to claim 6, characterized in that: The metal substrate (100) is in a cylindrical or long strip structure.
9. A solar cell, characterized in that: The invention comprises a plurality of battery cells (20) and a metal interconnection bar (10) as claimed in any one of claims 1 to 8, wherein adjacent battery cells (20) are connected via the plurality of metal interconnection bars (10), wherein the metal interconnection bars (10) are connected to corresponding positions of corresponding battery cells (20) via connection regions.
10. A photovoltaic module, characterized in that: The invention comprises the solar cell as claimed in claim 9 and a packaging component, wherein the solar cell is packaged by the packaging component.