Battery sheet dual glass assembly and photovoltaic system

Abstract

The application relates to photovoltaic module technology and discloses a cell double-glass module and a photovoltaic system. The cell double-glass module comprises a first transparent glass, a first encapsulating film, a cell layer, a second encapsulating film, a functional layer and a second transparent glass which are sequentially stacked along the thickness direction of the cell double-glass module. The cell layer comprises a plurality of cells which are distributed in a matrix form. The functional layer comprises a transparent substrate, a heating module and a reflecting module. The heating module and the reflecting module are attached to the transparent substrate. The heating module can heat the longitudinal area where the cells are located and the longitudinal gap of the cells respectively. The reflecting module can reflect the light irradiated to the transverse gap of the cells. The cell double-glass module not only has a rationalized heating design, effectively reduces the heating energy consumption, avoids the increase of the module thickness and weight, but also can improve the power generation efficiency.

Description

Technical Field

[0001] This invention relates to photovoltaic module technology, and more specifically, to a double-glass module with solar cells. Furthermore, this invention also relates to a photovoltaic system incorporating the double-glass module with solar cells. Background Technology

[0002] In traditional photovoltaic (PV) modules, the backsheet's permeability leads to hydrolysis of the internal EVA resin. This is particularly problematic for PV power plants located near the sea, water, or in high-humidity areas. The decomposition products from this process corrode the silver grid lines and busbars on the PV cells, causing potential-induced degradation (PID) and snail trails, thus affecting the module's lifespan. Double-glass modules effectively address the impact of water permeability on PV cell performance. Furthermore, the weather resistance and corrosion resistance of glass are significantly superior to the plastic backsheet materials used in traditional PV modules.

[0003] However, in actual use, double-glass modules are exposed to outdoor environments for extended periods, especially in colder regions with significant diurnal temperature variations. During thermal expansion and contraction, the different thermal expansion coefficients of the various materials within the photovoltaic cells can cause loosening of the internal structure over time, leading to decreased photovoltaic efficiency or even complete malfunction. Furthermore, in areas prone to extreme cold, double-glass modules are susceptible to icing, which can damage the modules and ultimately reduce their lifespan. Additionally, traditional photovoltaic modules use white plastic backsheets, which reflect transmitted light to some extent, improving efficiency. Current double-glass modules, however, use transparent sealant films on both the front and back, failing to reflect transmitted light and thus reducing overall efficiency.

[0004] To address the aforementioned problems with double-glass modules, various double-glass modules with heating functions have been developed. For example, patent CN112803889A proposes a novel bifacial double-glass module with heating function. However, in practical applications, it still has the following shortcomings: First, the double-glass module structure introduces more intermediate layers (including a fixing plate and a heat-conducting layer), increasing the thickness and weight of the double-glass module and raising the workload of later installation. Excessive intermediate layers also increase the risk of air bubbles forming in the double-glass module during the lamination process. Second, it does not improve the light loss transmitted through the gaps between the solar cells in the double-glass module. Third, there are no clear requirements for the design of heating performance. Generally, the requirements for the heating performance of double-glass modules mainly focus on heating power density and heating uniformity. Considering the application scenarios of double-glass modules, their defrosting performance requirements are not high. It is only necessary to ensure that the entire module does not freeze during use (there is no requirement for the defrosting rate), and the heating power density does not need to be designed too high. Heating uniformity is related to the heating power density of each heating area. During the heating process of each area in the double-glass module, the temperature difference of the entire module surface is controlled within a certain range by adjusting the heating power density of each area. Otherwise, it may lead to the risk of loosening of the cells inside the double-glass module. Summary of the Invention

[0005] First, the problem to be solved by the present invention is to provide a double-glass solar cell module that not only has a rational heating design to effectively reduce heating energy consumption and avoid excessive increase in module thickness and weight, but also improves power generation efficiency.

[0006] Secondly, the problem to be solved by the present invention is to provide a photovoltaic system in which the double-glass module of the photovoltaic cell not only has a rational heating design to effectively reduce heating energy consumption and avoid excessive increase in module thickness and weight, but also improves power generation efficiency.

[0007] To achieve the above objectives, a first aspect of the present invention provides a double-glass solar cell assembly, comprising a first transparent glass, a first encapsulation film, a solar cell layer, a second encapsulation film, a functional layer, and a second transparent glass, which are sequentially stacked along the thickness direction of the double-glass solar cell assembly. The solar cell layer comprises a plurality of solar cells arranged in a matrix. The functional layer comprises a transparent substrate, a heating module, and a reflection module. The heating module and the reflection module are both attached to the transparent substrate, such that the heating module can heat the longitudinal region where the solar cells are located and the longitudinal gaps between the solar cells, respectively, and the reflection module can reflect light incident on the transverse gaps of the solar cells.

[0008] Preferably, the heating module includes a first heating unit and a second heating unit, wherein the first heating unit is located in the longitudinal region on the transparent substrate corresponding to the battery cell, and the second heating unit is located in the region on the transparent substrate corresponding to the longitudinal gap of the battery cell.

[0009] More preferably, the heating power density of the first heating unit and the second heating unit are 50-150W / m², respectively. 2 The heating power density of the first heating unit is greater than or equal to the heating power density of the second heating unit.

[0010] More preferably, the first heating unit includes a plurality of first heating wires arranged at intervals, and the second heating unit includes a plurality of second heating wires arranged at intervals.

[0011] Specifically, both the first and second electric heating wires are made of metal wire. The width of the first electric heating wire is 5-20 μm and the wire spacing is 500-2000 μm. The width of the second electric heating wire is greater than or equal to 100 μm and the wire spacing is 10-50 μm.

[0012] As a preferred structural configuration, the reflective module includes multiple spaced reflective units located on the transparent substrate within regions corresponding to the lateral gaps of the solar cells.

[0013] Preferably, the reflective unit is a metal strip with a lateral width greater than 100 μm, and the lateral spacing between adjacent reflective units is less than or equal to 50 μm.

[0014] Specifically, the heating module and the reflection module are each independently disposed on the side of the transparent substrate facing the second transparent glass.

[0015] Typically, the first encapsulation film, the second encapsulation film, and the transparent substrate are made of the same material, and the thickness of the transparent substrate is 50-100 μm.

[0016] A second aspect of the present invention provides a photovoltaic system comprising the aforementioned double-glass solar cell module.

[0017] Through the above technical solution, the double-glass module provided by the present invention uses a heating module to heat the longitudinal region where the solar cells are located and the longitudinal gaps between the solar cells respectively. While meeting the heating performance requirements of the double-glass module, the power consumption caused by the heating process is reduced as much as possible. The reflection module reflects the light that shines on the transverse gaps of the solar cells, so that the photovoltaic cells can absorb and utilize the reflected light, which can improve the power generation efficiency of the entire double-glass module to a certain extent. Integrating the heating module and the reflection module into one piece through a transparent substrate can effectively avoid excessive increase in the thickness and weight of the double-glass module, making the structure of the double-glass module simple.

[0018] In a preferred embodiment of the present invention, the width of the first heating wire in the first heating unit is 5-20 μm and the line spacing is 500-2000 μm, which enables uniform heating of the area where the solar cell is located without affecting the transmission of visible light in that area. The second heating unit is set on the transparent substrate in the area corresponding to the longitudinal gap of the solar cell, and the second heating wire is a metal wire with a width of 80-120 μm and a line spacing of 10-50 μm. This allows the second heating unit to not only electrically heat the longitudinal gap of the solar cell, but also reflect the light irradiated onto the longitudinal gap of the solar cell, thereby further improving the power generation efficiency of the entire double-glass module.

[0019] Other technical features and effects of the present invention will be further described in the detailed embodiments below. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a specific embodiment of the double-glass solar cell module of the present invention;

[0021] Figure 2 This is a schematic diagram of a specific embodiment of the functional layer in this invention;

[0022] Figure 3 This is a cross-sectional schematic diagram of another specific embodiment of the functional layer in this invention.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. First transparent glass; 2. First encapsulation film

[0025] 3-layer battery, 31-cell battery

[0026] 4. Second encapsulation film; 5. Functional layer

[0027] 51 Transparent substrate 52 First heating unit

[0028] 53 Second heating unit 54 Reflection unit

[0029] 55 busbar 6 second transparent glass Detailed Implementation

[0030] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] First, it should be noted that some directional terms used in the following description to clearly illustrate the technical solution of the present invention, such as "upper," "lower," "longitudinal," and "lateral," etc., refer to the direction above the thickness direction when the double-glass solar cell module is placed horizontally. "Lower" refers to the opposite direction to "upper." When the double-glass solar cell module is placed horizontally, one arrangement direction of the arrangement matrix of the solar cells 31 is "longitudinal," and the other arrangement direction is "lateral" (the present invention will refer to...). Figure 2 (The terms "longitudinal" and "lateral" are used to describe the technical solution in detail.) The terms are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features.

[0033] The first aspect of the present invention provides a double-glass solar cell module, see [link to relevant documentation]. Figures 1 to 3 The battery cell double-glass assembly includes a first transparent glass 1, a first encapsulation film 2, a battery layer 3, a second encapsulation film 4, a functional layer 5, and a second transparent glass 6, which are stacked sequentially along the thickness direction of the battery cell double-glass assembly. The battery layer 3 includes a plurality of battery cells 31 arranged in a matrix. The functional layer 5 includes a transparent substrate 51, a heating module, and a reflection module. The heating module and the reflection module are both attached to the transparent substrate 51, so that the heating module can heat the longitudinal region where the battery cell 31 is located and the longitudinal gap of the battery cell 31 respectively, and the reflection module can reflect the light that shines on the transverse gap of the battery cell 31.

[0034] In this invention, the battery cells 31 on the battery layer 3 are arranged in a matrix according to two intersecting directions (the horizontal and vertical directions can be perpendicular or not perpendicular to each other). The heating module and the reflection module can be detachably installed with the transparent substrate 51 or integrated into the transparent substrate 51 without detachment. Preferably, the heating module and the reflection module are fabricated on the surface of the transparent substrate 51 in one step according to the pre-designed functional and orientation requirements using a "print-etch" technique to obtain the functional layer 5. The installation process of the first transparent glass 1, the first encapsulation film 2, the battery layer 3, the second encapsulation film 4, the functional layer 5, and the second transparent glass 6 can adopt conventional methods in the art, such as lamination. It should be noted that in this invention, the heating module and the reflection module are independently set up, without intersection or overlap, and there is no mutual interference between them; the vertical region where the battery cells 31 are located refers to the region on the double-glass module that extends longitudinally along the arrangement of the battery cells 31 and penetrates the double-glass module.

[0035] The double-glass module provided by the above-mentioned basic technical solution of the present invention utilizes a heating module to heat the longitudinal region where the solar cell 31 is located and the longitudinal gap of the solar cell 31, respectively, thereby achieving heating of the entire area of ​​the double-glass module. The heating of the two regions is controlled independently, which can minimize the power consumption caused by the heating process while meeting the heating performance requirements of the double-glass module. A reflection module is used to reflect the light that shines on the transverse gap of the solar cell 31, so that the photovoltaic cell can absorb and utilize the reflected light, which can improve the power generation efficiency of the entire double-glass module to a certain extent. The heating module and the reflection module are integrated into one piece through a transparent substrate 51, which makes the structure of the double-glass module simple. Compared with the ordinary double-glass module structure, the increase in thickness and weight of this double-glass module is negligible.

[0036] In this invention, the heating module is equipped with heating elements corresponding to the area where the battery cell 31 is located and the longitudinal gap of the battery cell 31. As a preferred embodiment of the heating module, the heating module includes a first heating unit 52 and a second heating unit 53. The first heating unit 52 is located on the transparent substrate 51 within the longitudinal region corresponding to the battery cell 31, and the second heating unit 53 is located on the transparent substrate 51 within the region corresponding to the longitudinal gap of the battery cell 31. The arrangement of the first heating unit 52 and the second heating unit 53 allows for the design of different heating power densities and other parameters to meet the different heating requirements of the longitudinal region corresponding to the battery cell 31 and the region corresponding to the longitudinal gap of the battery cell 31, thereby achieving a rational heating design for each region of the entire double-glass module.

[0037] In a preferred embodiment, the heating power density of the first heating unit 52 and the second heating unit 53 is 50-150 W / m², respectively. 2The heating power density of the first heating unit 52 is greater than or equal to the heating power density of the second heating unit 53. The heating power density of the first heating unit 52 and the second heating unit 53 is controlled between 50-150 W / m². 2 Within this range, primarily based on experimental research, it was found that after storing the double-glass module in an environment of -20°C for a period of time, a certain amount of water (sprayed at a rate of 0.044 g / cm³) was then applied to the module surface. 2 (Calculations were performed). After the surface iced over, the module was continuously heated with electricity. The specific time required for de-icing is shown in Table 1. Table 1 shows that when the heating power density of the double-glass module is ≥50W / m²... 2 At this time, it can melt the ice on the surface, ensuring that the module does not freeze at -20°C; in addition, considering that the power generation efficiency of most double-glass modules is currently only 100-150W / m 2 (Specifically related to light intensity), in order to minimize the heating power density of the double-glass module while meeting heating and de-icing requirements, and thus save energy consumption for heating, the heating power density of the double-glass module is controlled at 50-150W / m². 2 Within the range. Considering that the area of ​​the first heating unit 52 is larger than that of the second heating unit 53, and that there will be a certain amount of heat conduction inside the double-glass module during the heating process, in order to ensure the heating uniformity of the heating surface, it is necessary to ensure that the heating power density of the first heating unit 52 is greater than that of the second heating unit 53. This can reduce the adverse effects caused by a certain difference in the heating power density between the first heating unit 52 and the second heating unit 53.

[0038] Table 1

[0039] <![CDATA[Heating power density (W / m 2 )]]> 45 50 55 60 De-icing time (hours) cannot 3 2.7 2.5

[0040] In this invention, the first heating unit 52 and the second heating unit 53 can be configured using conventional electric heating elements or electric heating wires. Preferably, the first heating unit 52 includes multiple spaced-apart first electric heating wires distributed within the longitudinal region corresponding to the battery cell 31, and the second heating unit 53 includes multiple spaced-apart second electric heating wires distributed within the region corresponding to the longitudinal gaps of the battery cell 31. The arrangement directions of the first and second electric heating wires can be the same or different; they can be arranged along the longitudinal direction of the battery cell 31 or along the transverse direction. More preferably, both the first and second electric heating wires are spaced-apart along the transverse direction of the battery cell 31. It should be noted that the first and second electric heating wires are connected to a power supply and a switch, and busbars 55 are provided at both ends of the first and second electric heating wires for energizing them.

[0041] In this invention, the first and second heating wires can be made of metals such as iron-chromium-aluminum alloy, nickel-chromium alloy, tungsten, molybdenum, gold, silver, and copper. As a preferred embodiment of the first and second heating wires in this invention, both are metal wires; preferably, they are made of gold, silver, or copper; from a cost and performance perspective, copper wire is more preferred. In this case, the second heating wire can not only electrically heat the longitudinal gaps of the solar cell 31, but also reflect the light irradiated onto these gaps, enabling the solar cell 31 to utilize the transmitted light and further improve the power generation efficiency of the entire double-glass module.

[0042] In this invention, the design requirements for the line width and line spacing of the first heating wire in the first heating unit 52 and the second heating wire in the second heating unit 53 are mainly determined by the heating power density requirements of each region, where P in equation (1) d (Powerdesity) represents the heating power density, U represents the heating voltage applied to the corresponding heating area, R represents the resistance of the heating area (the total resistance of each heating wire connected in parallel in the heating area), and S represents the area of ​​the heating area; in equation (2), R0 represents the resistance value of each heating wire, ρ represents the resistivity of the heating wire, L represents the length of the heating wire, W represents the width of the heating wire, and H represents the thickness of the heating wire. According to the design requirements of the present invention, it is necessary to meet the following requirement: ① The heating power density of the first heating unit 52 and the second heating unit 53 should be controlled within 50-150 W / m. 2 Therefore, the specific values ​​of the line width and spacing of the electric heating wires in the first heating unit 52 and the second heating unit 53 are controlled within the respective limited ranges for the electric heating wires in the first heating unit 52 and the second heating unit 53. A suitable heating voltage is selected to ensure that the heating power density P obtained by substituting it into equations (1), (2), and (3) is within the range. d If condition ① can be satisfied simultaneously, the design requirements of this invention can be met.

[0043]

[0044]

[0045]

[0046] In a preferred embodiment of the first electric heating wire in this invention, the width of the first electric heating wire is 5-20 μm and the wire spacing is 500-2000 μm. The first electric heating wire of the first heating unit 52 is mainly used for heating the area covered by the solar cell 31 in the double-glass module. Considering that the first electric heating wire in this part should not affect the transmission of visible light, so as to reduce its impact on the power generation efficiency of the solar cell 31, it is desirable that the first electric heating wire in this area be as thin as possible. However, considering that the first electric heating wire itself is too thin, it is easy to break the wire during the production process. Therefore, the width of the first electric heating wire is controlled at 5-20 μm. At the same time, the wider the spacing between the first electric heating wires in this area, the better. However, if the spacing is too wide, it is easy to cause uneven temperature in the longitudinal area corresponding to the entire solar cell 31. In order to study the influence of the width between the first electric heating wires on the heating uniformity and visible light transmission, several sets of comparative experiments were designed under the condition that the width of the first electric heating wire is controlled at 10 μm. The specific experimental data obtained are shown in Table 2.

[0047] Table 2

[0048] Line spacing W (μm) 400 500 1000 1500 2000 2100 Transmittance T (%) 82.4％ 85.3％ 86.5％ 87.4％ 88.1％ 88.5％ Heating uniformity ΔT (°C) 0.8 1.2 2.3 3.5 4.6 8.5

[0049] In Table 2, the transmittance T represents the transmittance of the entire double-glass module obtained by testing under the condition that the solar cell 31 is not introduced, and other conditions are the same as those of a normal double-glass module. The heating uniformity ΔT is expressed as the transmittance of the entire double-glass module under the condition that the heating power density is 150W / m². 2 Under certain conditions, when the spacing between the first heating wires is less than 500μm, it has a significant impact on the transmittance of visible light; when the spacing between the first heating wires is greater than 2000μm, the temperature of the entire heating area reaches 8.5℃ (for the heating uniformity of heated glass products, it is generally desirable to control it within 5℃). Therefore, the spacing between the first heating wires should be controlled within the range of 500-2000μm.

[0050] In a preferred embodiment of the second electric heating wire in this invention, the width of the second electric heating wire is greater than or equal to 100 μm and the wire spacing is 10-50 μm. It is also ensured that the sum of the widths of all the first electric heating wires in the area corresponding to the longitudinal gap of the battery cell 31 and the sum of the wire spacings of all the first electric heating wires are less than or equal to the spacing width of the longitudinal gap of the battery cell.

[0051] For the second electric heating wire of the second heating unit 53, it is necessary to comprehensively consider its role in heating the area at the longitudinal gap between the battery cells 31 and the reflection of transmitted light in this area. By first controlling the width of the metal wire to 100μm, several sets of comparative experiments were designed, and the specific experimental data obtained are shown in Table 3.

[0052] Table 3

[0053] Line spacing W (μm) 5 10 20 30 40 50 55 Reflectance R (%) 97.1 97.0 96.5 95.9 95.5 95.1 91.2

[0054] In Table 3, the reflectivity R represents the reflectivity of the portion of the double-glass module not covered by the solar cell 31 to visible light. Table 3 clearly shows that when the width of the second heating wire is 100 μm, as the spacing between the wires increases from 5 μm to 55 μm, its reflectivity to visible light gradually decreases. When the spacing reaches 50 μm and continues to increase, the reflectivity decreases rapidly. When the spacing decreases further from 10 μm, its impact on the reflectivity to visible light is minimal. Furthermore, from a process perspective, a wider spacing of the second heating wire is easier to control. Therefore, the spacing of the second heating wire should be controlled within the range of 10-50 μm.

[0055] To further investigate the effect of the width of the second electric heating wire in the second heating unit 53 on the visible light reflection performance, the wire spacing of the second electric heating wire was controlled at 10 μm, and several sets of comparative experiments were set up. The specific experimental data obtained are shown in Table 4.

[0056] Table 4

[0057] Silk width (μm) 80 90 100 110 120 Reflectance R (%) 91.7 92.4 97.0 97.2 97.3

[0058] In Table 4, the reflectivity R represents the reflectivity of the region of the double-glass module that is not covered by the solar cell 31 to visible light. It can be clearly seen from Table 4 that when the spacing between the second heating wires is fixed at 10 μm, the reflectivity of the second heating wire decreases relatively quickly when the line width is less than 100 μm. When the line width is increased to 100 μm and then further increased, the effect on the increase in reflectivity of visible light is small. Therefore, the line width of the second heating wire should be controlled at ≥100 μm. At the same time, the sum of the line widths of all the second heating wires in this region and the sum of the spacing between all the second heating wires should be less than or equal to the spacing width of the longitudinal gap of the solar cell 31.

[0059] In this invention, the reflection module is mainly used to reflect transmitted light at the lateral gap of the battery cell 31 in the double glass module. As a preferred embodiment of the reflection module, the reflection module includes a plurality of spaced reflection units 54. The reflection units 54 are located on the transparent substrate 51 in the region corresponding to the lateral gap of the battery cell 31, while satisfying that the reflection units 54 and the heating module do not intersect with each other.

[0060] In this invention, the reflecting unit 54 can be a reflective sheet with a reflective effect. As a preferred embodiment of the reflecting unit 54, see [link to relevant documentation]. Figure 2The reflective unit 54 is made of metal strip. The design requirements for the line width and line spacing of the reflective unit 54 (metal strip) can be consistent with the line width and line spacing of the second electric heating wire in the second heating unit 53. Alternatively, the longitudinal width of the reflective unit 54 can be set to not exceed the longitudinal gap of the battery cell 31, and the lateral width can be set to not exceed the line spacing of the first electric heating wire. Preferably, the longitudinal width of the metal strip of the reflective unit 54 is directly consistent with the spacing width of the longitudinal gap of the battery cell 31, and the lateral width is set to be infinitely close to the line spacing width of the first electric heating wire. This not only increases the reflective area of ​​the reflective unit 54, but also ensures that the reflective unit 54 and the first electric heating wire do not come into contact with each other.

[0061] In a preferred embodiment, the reflective unit 54 is a metal strip with a lateral width greater than 100 μm, and the lateral spacing between adjacent reflective units 54 is less than or equal to 50 μm, so as to improve the reflection effect of the reflective unit 54 on the light at the lateral gap of the battery cell 31. The metal strip can be made of metal materials such as gold, silver, or copper. In a preferred embodiment, a metal strip made of gold, silver, or copper is used; from the perspective of cost and performance, a copper metal strip is more preferred.

[0062] In this invention, the heating module and the reflection module are located on the same side of the transparent substrate 51. Preferably, the heating module and the reflection module are each independently arranged on the side of the transparent substrate 51 facing the second transparent glass 6, ensuring that the heating module meets the de-icing requirements of the double-glass module in cold winter with minimal energy consumption, reducing the energy consumption of the double-glass module during winter use, and improving the reflection efficiency of the reflection module, thereby improving the power generation efficiency of the double-glass module.

[0063] In this invention, the first encapsulation film 2, the second encapsulation film 4, and the transparent substrate 51 are made of the same material, which can be selected from films made of polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyvinyl octene elastomer (POE), etc., and is preferably an EVA film.

[0064] In this invention, preferably, the thickness of the transparent substrate 51 is 50-100 μm to avoid excessive increase in the thickness and weight of the double-glass module.

[0065] As a relatively preferred embodiment of the double-glass solar cell module in this invention, see [link to specific embodiment]. Figure 1 and Figure 2The assembly comprises, along the thickness direction of the double-glass solar cell module, a first transparent glass 1, a first encapsulation film 2, a solar cell layer 3, a second encapsulation film 4, a functional layer 5, and a second transparent glass 6, stacked sequentially. The solar cell layer 3 includes multiple solar cells 31 arranged in a matrix. The functional layer 5 includes a transparent substrate 51, a heating module, and a reflection module. Both the heating module and the reflection module are attached to the transparent substrate 51 on the side facing the second transparent glass 6. The heating module includes a first heating unit 52 and a second heating unit 53. The first heating unit 52 is located in the longitudinal region of the transparent substrate 51 corresponding to the solar cell 31, and the second heating unit 53 is located in the region of the transparent substrate 51 corresponding to the longitudinal gap between the solar cell 31. The heating power densities of the first heating unit 52 and the second heating unit 53 are 50-150 W / m², respectively. 2 The heating power density of the first heating unit 52 is greater than or equal to the heating power density of the second heating unit 53. The first heating unit 52 includes multiple first heating wires arranged laterally at intervals, distributed in the longitudinal region corresponding to the battery cell 31. The second heating unit 53 includes multiple second heating wires arranged laterally at intervals, distributed in the region corresponding to the longitudinal gaps of the battery cell 31. Both the first and second heating wires are made of copper metal wire and are connected to the busbar 55 at both ends. The width of the first heating wire is 5-20 μm and the wire spacing is 500-2000 μm. The width of the second heating wire is greater than or equal to 100 μm and the wire spacing is... The thickness of the first heating wire is 10-50μm, and the sum of the widths of all the first heating wires in each longitudinal gap area of ​​the battery cell 31 and the sum of the line spacing of all the first heating wires are less than or equal to the spacing width of the longitudinal gap of the battery cell; the reflection module includes multiple spaced reflection units 54, which are located on the transparent substrate 51 in the area corresponding to the transverse gap of the battery cell 31. The reflection unit 54 is a copper metal strip with a transverse width greater than 100μm, and the transverse spacing of adjacent reflection units 54 is less than or equal to 50μm; the first encapsulation film 2, the second encapsulation film 4 and the transparent substrate 51 are made of EVA film, and the thickness of the transparent substrate 51 is 50-100μm.

[0066] The double-glass module provided in the above specific embodiment can energize the first and second electric heating wires through the bus 55 in cold winter to heat the longitudinal region where the battery cell 31 is located and the longitudinal gap between the battery cells 31, ensuring that the de-icing requirements of the double-glass module are met with the lowest energy consumption in cold winter, reducing the energy consumption of the double-glass module during winter use. At the same time, it can also ensure that the temperature difference of the entire surface area of ​​the double-glass module is controlled within a reasonable range during the energized heating process, improving the uniformity of the entire module heating process and reducing the potential risks to the double-glass module caused by large temperature differences. In addition, the second electric heating wire and the reflective unit 54 are located in the longitudinal and transverse gap areas between the battery cells 31, which can effectively increase the reflection of transmitted light in this area, and can improve the power generation efficiency of the entire double-glass module to a certain extent.

[0067] Based on the aforementioned double-glass solar cell module, a second aspect of the present invention provides a photovoltaic system comprising the double-glass solar cell module described in any of the above technical solutions. Therefore, it possesses at least all the beneficial effects brought about by the technical solutions of the above-described double-glass solar cell module embodiments.

[0068] As can be seen from the above description, the double-glass module provided by the present invention uses a heating module to heat the area where the solar cell 31 is located and the longitudinal gap of the solar cell 31 respectively. Under the premise of meeting the heating performance requirements of the double-glass module, the power consumption caused by the heating process is reduced as much as possible. The reflection module reflects the light that shines on the transverse gap of the solar cell 31, so that the photovoltaic cell can absorb and utilize the reflected light, which can improve the power generation efficiency of the entire double-glass module to a certain extent. Integrating the heating module and the reflection module into one piece through a transparent substrate can effectively avoid increasing the thickness and weight of the double-glass module, making the structure of the double-glass module simple.

[0069] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A double-glass solar cell module, characterized in that, The battery cell double-glass assembly includes a first transparent glass (1), a first encapsulation film (2), a battery layer (3), a second encapsulation film (4), a functional layer (5), and a second transparent glass (6) stacked sequentially along the thickness direction of the battery cell double-glass assembly. The battery layer (3) includes a plurality of battery cells (31) arranged in a matrix. The functional layer (5) includes a transparent substrate (51), a heating module, and a reflection module. The heating module and the reflection module are both attached to the transparent substrate (51), so that the heating module can heat the longitudinal region where the battery cell (31) is located and the longitudinal gap of the battery cell (31) respectively, and the reflection module can reflect the light that shines on the transverse gap of the battery cell (31). The heating module includes a first heating unit (52) and a second heating unit (53). The first heating unit (52) is located in the longitudinal region on the transparent substrate (51) corresponding to the battery cell (31), and the second heating unit (53) is located in the region on the transparent substrate (51) corresponding to the longitudinal gap of the battery cell (31). The first heating unit (52) includes multiple spaced first heating wires, and the second heating unit (53) includes multiple spaced second heating wires. Both the first heating wire and the second heating wire are made of metal wire. The width of the first heating wire is 5-20 μm and the wire spacing is 500-2000 μm. The width of the second heating wire is greater than or equal to 100 μm and the wire spacing is 10-50 μm.

2. The double-glass solar cell module according to claim 1, characterized in that, The heating power densities of the first heating unit (52) and the second heating unit (53) are 50-150 W / m², respectively. 2 The heating power density of the first heating unit (52) is greater than or equal to the heating power density of the second heating unit (53).

3. The double-glass solar cell module according to claim 1 or 2, characterized in that, The reflective module includes a plurality of spaced reflective units (54), which are located on the transparent substrate (51) in regions corresponding to the lateral gaps of the battery cell (31).

4. The double-glass solar cell module according to claim 3, characterized in that, The reflective unit (54) is a metal strip with a lateral width greater than 100 μm, and the lateral spacing between adjacent reflective units (54) is less than or equal to 50 μm.

5. The double-glass solar cell module according to claim 1 or 2, characterized in that, The heating module and the reflection module are each independently disposed on the side of the transparent substrate (51) facing the second transparent glass (6).

6. The double-glass solar cell module according to claim 1 or 2, characterized in that, The first encapsulation film (2), the second encapsulation film (4) and the transparent substrate (51) are made of the same material, and the thickness of the transparent substrate (51) is 50-100μm.

7. A photovoltaic system, characterized in that, Includes the double-glass solar cell module according to any one of claims 1 to 4.

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