Photovoltaic module

Abstract

The invention discloses a photovoltaic module, and the photovoltaic module comprises a first battery and a second battery, and the first battery and the second battery are arranged at an interval in a first direction; the plurality of electric connecting pieces are respectively connected with the first battery and the second battery, the plurality of electric connecting pieces extend in a first direction and are arranged at intervals in a second direction, and the first direction is perpendicular to the second direction; wherein the sectional area of the electric connecting piece is S, and S meets the relational expression that S is larger than or equal to 0.003 mm < 2 > and smaller than or equal to 0.2 mm < 2 >, so that resistance can be greatly reduced, light shielding can be reduced, and the photoelectric conversion efficiency of the photovoltaic module can be improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Technology

[0002] In existing technologies, the size of the solar cell, the number of grid lines on the solar cell, the number of solder strips, and the cross-sectional area of ​​the solder strips all affect the power generation of photovoltaic modules.

[0003] Among them, the main factor affecting the power generation of photovoltaic modules is the cross-sectional area of ​​the solder strip. Different solder strip cross-sectional areas can cause the cells to consume different amounts of power, and also affect the current and resistance they can carry. Therefore, selecting a suitable cross-sectional area of ​​the solder strip is extremely important for high-power photovoltaic modules, and also has a significant impact on the cost. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a photovoltaic module in which the cross-sectional area S of the electrical connectors satisfies the relationship: 0.003 mm². 2 ≤S≤0.2mm 2 This can significantly reduce resistance and reduce light shading, thereby improving the photoelectric conversion efficiency of photovoltaic modules.

[0005] A photovoltaic module according to an embodiment of the present invention includes: a first cell and a second cell, the first cell and the second cell being arranged at a distance in a first direction; a plurality of electrical connectors, the plurality of electrical connectors being respectively connected to the first cell and the second cell, the plurality of electrical connectors extending in the first direction and spaced apart in a second direction, the first direction and the second direction being perpendicular; wherein, the cross-sectional area of ​​the electrical connector is S, and S satisfies the relationship: 0.003 mm 2 ≤S≤0.2mm 2 .

[0006] Therefore, the cross-sectional area S of the electrical connector in the photovoltaic module satisfies the following relationship: 0.003mm 2 ≤S≤0.2mm 2 This can significantly reduce resistance and reduce light shading, thereby improving the photoelectric conversion efficiency of photovoltaic modules.

[0007] According to some embodiments of the present invention, both the first battery and the second battery are Topcon batteries, and S satisfies the relationship: 0.011mm 2 ≤S≤0.125mm 2 .

[0008] According to some embodiments of the present invention, the spacing between two adjacent electrical connectors is k, and k and S satisfy the relationship: 8150 × log10 (S)+16000≤k≤14100×log 10 (S)+34200, where k is in um.

[0009] According to some embodiments of the present invention, k satisfies the relationship: 2250um≤k≤13120um.

[0010] According to some embodiments of the present invention, the number of electrical connectors is 16-80.

[0011] According to some embodiments of the present invention, both the first battery and the second battery are BC batteries, and S satisfies the relationship: 0.02mm 2 ≤S≤0.2mm 2 .

[0012] According to some embodiments of the present invention, the spacing between two adjacent electrical connectors is k, and k and S satisfy the relationship: 7200 × log 10 (S)+13000≤k≤11600×log 10 (S)+29100, where k is in units of um.

[0013] According to some embodiments of the present invention, k satisfies the relationship: 2250um≤k≤13120um.

[0014] According to some embodiments of the present invention, the number of electrical connectors is 20-80.

[0015] According to some embodiments of the present invention, both the first battery and the second battery are Topcon stacked grid batteries, and S satisfies the relationship: 0.003mm 2 ≤S≤0.05mm 2 .

[0016] According to some embodiments of the present invention, the spacing between two adjacent electrical connectors is k, and k satisfies the relationship with S: 1674.5 × log 10 (S) + 4918.8 ≤ k ≤ 2404.1 × log 10 (S)+7992.7, where k is in um.

[0017] According to some embodiments of the present invention, k satisfies the relationship: 560um≤k≤2250um.

[0018] According to some embodiments of the present invention, the number of electrical connectors is 80-320.

[0019] According to some embodiments of the present invention, the cross-section of the electrical connector is an equilateral triangle.

[0020] According to some embodiments of the present invention, the first battery is provided with a plurality of first sub-grid lines, the plurality of first sub-grid lines being spaced apart in the first direction and extending in the second direction; the second battery is provided with a plurality of second sub-grid lines, the plurality of second sub-grid lines being spaced apart in the first direction and extending in the second direction; wherein, the plurality of electrical connectors are respectively connected to the plurality of first sub-grid lines and the plurality of second sub-grid lines and are arranged crosswise.

[0021] According to some embodiments of the present invention, the first battery is provided with a plurality of third sub-grid lines, the plurality of third sub-grid lines extending in the first direction and spaced apart in the second direction; the second battery is provided with a plurality of fourth sub-grid lines, the plurality of fourth sub-grid lines extending in the first direction and spaced apart in the second direction; wherein, a plurality of electrical connectors are connected to and overlapped with the plurality of third sub-grid lines in a one-to-one correspondence, and a plurality of electrical connectors are connected to and overlapped with the plurality of fourth sub-grid lines in a one-to-one correspondence.

[0022] According to some embodiments of the present invention, the photovoltaic module further includes: a front glass, the front glass being located on the front of the first battery and the second battery; a back sheet, the back sheet being located on the back of the first battery and the second battery; and an encapsulating film, the encapsulating film being located between the front of the first battery and the second battery and the front glass, and the encapsulating film also being located between the back of the first battery and the second battery and the back sheet.

[0023] According to some embodiments of the present invention, the photovoltaic module further includes: a light guide plate, one side of which is connected to the front glass, and the other side of which is connected to the adhesive film and provided with a reflective portion, the reflective portion being disposed opposite to the first battery and the second battery respectively; the reflective portion is formed with a plurality of reflective units arranged in rows, and the surface of each reflective unit is a curved surface or an arc surface.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the uniformly distributed electrical connectors of the Topcon battery according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a photovoltaic module according to an embodiment of the present invention; Figure 3This is a graph showing the relationship between the solder ribbon diameter and solder ribbon cost of the Topcon182 battery according to an embodiment of the present invention; Figure 4 This is a graph showing the relationship between the solder ribbon diameter and solder ribbon cost of the Topcon210 battery according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the uniformly distributed electrical connectors of a Topcon stacked grid cell according to another embodiment of the present invention.

[0026] Figure label: 200. Photovoltaic modules; 10. First battery; 11. First sub-grid line; 12. Second battery; 121. Second sub-grid line; 20. Electrical connectors; 40. Front glass; 50. Light guide plate; 51. Reflector; 60. Adhesive film; 70. Backing plate. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0028] The following is for reference. Figure 1 and Figure 2 A photovoltaic module 200 according to an embodiment of the present invention is described.

[0029] Reference Figure 1 and Figure 2 As shown, the photovoltaic module 200 of the first aspect embodiment of the present invention includes: a first cell 10, a second cell 12, and a plurality of electrical connectors 20. The first cell 10 and the second cell 12 are arranged at intervals in a first direction, and the plurality of electrical connectors 20 are respectively connected between the first cell 10 and the second cell 12. The plurality of electrical connectors 20 extend in the first direction and are spaced apart in a second direction. The first direction and the second direction are perpendicular. The cross-sectional area of ​​the electrical connector 20 is S, and S satisfies the relationship: 0.003 mm². 2 ≤S≤0.2mm 2 .

[0030] Specifically, the first cell 10 and the second cell 12 in the photovoltaic module 200 are electrically connected by an electrical connector 20, which can be a solder strip. The first cell 10 and the second cell 12 are arranged at intervals in a first direction, which can be the length direction of the first cell 10 or the second cell 12. Accordingly, multiple electrical connectors 20 extend in the first direction, so that the first cell 10 and the second cell 12 can be electrically connected in the first direction.

[0031] Furthermore, the multiple electrical connectors 20 are evenly spaced in a second direction, which can be the width direction of the first battery 10 or the second battery 12. The first direction and the second direction are perpendicular to each other. In this way, the multiple electrical connectors 20 can be distributed more evenly in the width direction of the first battery 10 or the width direction of the second battery 12, thereby making the current distribution more uniform.

[0032] When selecting the cross-sectional area S of the electrical connector 20, S satisfies the following relationship: 0.003mm 2 ≤S≤0.2mm 2 .

[0033] To meet the current requirements for the cross-sectional area of ​​the electrical connector 20 in the photovoltaic module 200 and the future trend of the cross-sectional area of ​​the electrical connector 20, the cross-sectional area S of the electrical connector 20 is selected within the range of 0.003 mm. 2 ≤S≤0.2mm 2 Since the cross-sectional area S of the electrical connector 20 is related to the resistance of the electrical connector 20, when the cross-sectional area S of the electrical connector 20 satisfies the above relationship, the electrical connector 20 can significantly reduce the resistance and reduce shading, thereby improving the photoelectric conversion efficiency of the photovoltaic module 200.

[0034] If the cross-sectional area of ​​electrical connector 20 is less than 0.003 mm² 2 The reduced current capacity of the electrical connector 20 leads to increased resistance. Since the cross-sectional area S of the electrical connector 20 is relatively small, this increases the number of connectors 20 required for a given photovoltaic module 200 size, causing shading and affecting the power generation efficiency of the photovoltaic module 200. Therefore, the cross-sectional area of ​​the electrical connector 20 should be no less than 0.003 mm². 2 .

[0035] When the cross-sectional area S of the electrical connector 20 is greater than 0.2 mm² 2 This would occupy a larger surface area, thus reducing the effective light-receiving area, lowering its power generation capacity, and increasing costs. Therefore, the cross-sectional area S of the electrical connector 20 should not exceed 0.2 mm². 2 .

[0036] For example, using solder ribbons with high reflectivity, such as equilateral triangular solder ribbons, can achieve the effect of both reducing resistance and reducing light shading.

[0037] Furthermore, the cross-sectional area S of the electrical connector 20 satisfies 0.02 mm². 2 ≤S≤0.1mm 2 .

[0038] When the cross-sectional area S of the electrical connector 20 is 0.02mm² 2This can further reduce the shading of the light-receiving area and maximize the preservation of the light-receiving area, thereby improving the photoelectric conversion efficiency.

[0039] Furthermore, since the power consumed and cost of the photovoltaic module 200 decrease as the cross-sectional area of ​​the electrical connector 20 decreases, a smaller value of 0.02 mm is selected for the cross-sectional area S of the electrical connector 20. 2 This can reduce costs.

[0040] When the cross-sectional area S of the electrical connector 20 is 0.1mm² 2 In this way, it can carry a larger current and further reduce the resistance, thus enabling the photovoltaic module 200 to operate in a larger power range of close to 600W and above 600W.

[0041] For example, the electrical connector 20 can be made of circular solder strip, the cross-sectional area of ​​which is... / 4, where d is the diameter of the solder strip, such as Figure 3 As shown, when using a Topcon battery with dimensions of 182mm×182mm, the Topcon182 battery uses 16 solder strips with a circular cross-sectional area. The cost of the solder strips decreases as the diameter of the solder strips decreases.

[0042] like Figure 4 As shown, when using a Topcon battery with a size of 210mm×210mm, the Topcon210 battery uses 18 solder strips with a circular cross-sectional area. The cost of the solder strips also decreases as the diameter of the solder strips decreases. Therefore, in terms of cost, using a smaller solder strip diameter can reduce the cross-sectional area of ​​the solder strips, thereby reducing the cost.

[0043] Therefore, the cross-sectional area S of the electrical connector 20 in the photovoltaic module 200 satisfies the following relationship: 0.003 mm 2 ≤S≤0.2mm 2 This can significantly reduce resistance and reduce light shading, thereby improving the photoelectric conversion efficiency of photovoltaic modules 200.

[0044] According to some embodiments of the present invention, both the first battery 10 and the second battery 12 are Topcon batteries, and S satisfies the relationship: 0.011mm 2 ≤S≤0.125mm 2 Among them, Topcon cells are tunneling oxide passivated contact cells, and the solder ribbon diameter of photovoltaic modules is generally less than 0.3mm.

[0045] If the cross-sectional area of ​​electrical connector 20 is less than 0.011 mm² 2The reduced current carrying capacity of the electrical connector 20 leads to a further increase in resistance. Furthermore, for high-power photovoltaic modules 200 approaching or exceeding 600W, a smaller cross-sectional area S increases energy loss during current transmission. Therefore, the cross-sectional area of ​​the electrical connector 20 should be no less than 0.011 mm². 2 .

[0046] When the cross-sectional area S of the electrical connector 20 is greater than 0.125 mm² 2 This would occupy a larger surface area, thus reducing the effective light-receiving area and lowering its power generation capacity. Therefore, the cross-sectional area S of the electrical connector 20 should not exceed 0.125 mm². 2 Generally, S is close to 0.1 mm. 2 At this time, the solder strip can usually be an equilateral triangular solder strip.

[0047] When the cross-sectional area S of the electrical connector 20 is 0.04 mm² 2 In this way, not only can the power consumption be reduced, but the current can also be carried, and the cost can also be reduced.

[0048] Alternatively, the cross-sectional area S of the electrical connector 20 may satisfy 0.02 mm². 2 ≤S≤0.1mm 2 .

[0049] The cross-sectional area S of the electrical connector 20 can be set to 0.02 mm. 2 This allows Topcon batteries to use a smaller cross-sectional area. Due to the high conductivity and low resistance of Topcon batteries, effective current transmission can be ensured, and resistance loss caused by the small cross-sectional area of ​​the electrical connector 20 can be reduced.

[0050] Furthermore, the cross-sectional area S of the electrical connector 20 can be set to 0.1 mm². 2 This allows Topcon batteries to have a larger cross-sectional area, which can significantly reduce resistance and thus reduce energy loss during current transmission.

[0051] According to some embodiments of the present invention, the distance between two adjacent electrical connectors 20 is k, and k and S satisfy the relationship: 8150 × log 10 (S)+16000≤k≤14100×log 10 (S)+34200, where k is in um.

[0052] Specifically, when both the first battery 10 and the second battery 12 are Topcon batteries, multiple electrical connectors 20 are respectively connected between the first battery 10 and the second battery 12.

[0053] The cross-sectional area S of the electrical connector 20 is within the range of 0.011 mm. 2 ≤S≤0.125 mm 2 The data is selected from the range of 2250um-13120um for the distance k between two adjacent electrical connectors 20, and the cross-sectional area S of multiple different electrical connectors 20 that meet the requirements of large power close to 600W and above 600W, as well as the corresponding distance k between two adjacent electrical connectors 20.

[0054] When selecting multiple different cross-sectional areas S of electrical connectors 20 with a power close to 600W and the corresponding spacing k between two adjacent electrical connectors 20, the scatter plot formed by the selected cross-sectional areas S and spacing k exhibits a logarithmic distribution. The cross-sectional areas of the selected electrical connectors 20 are all taken as logarithms with base 10. Then, linear fitting is performed on the data of the selected cross-sectional areas S and spacing k in Excel. By creating a scatter plot and adding a linear trend line in Excel, and then displaying the formula option, the linear regression equation, K = 14100 × log... 10 (S)+34200, with Log as the independent variable. 10 (S), the dependent variable is the distance k between two adjacent electrical connectors 20.

[0055] When selecting multiple different cross-sectional areas S of electrical connectors 20 that meet the requirements of a power of 600W or higher, and the spacing k between two adjacent electrical connectors 20, the resulting scatter plot exhibits a logarithmic distribution. Therefore, the cross-sectional areas of the selected electrical connectors 20 are all taken as logarithms with base 10. Then, linear fitting is performed on the data of these cross-sectional areas and spacing k in Excel. By creating a scatter plot and adding a linear trend line in Excel, and then displaying the formula option, the linear regression equation, K = 8150 × log0, can be displayed on the chart. 10 (S)+16000, with Log as the independent variable. 10 (S), the dependent variable is the distance k between two adjacent electrical connectors 20.

[0056] Thus, it can be concluded that the cross-sectional area S of the electrical connector 20 after taking the logarithm has a certain linear relationship with the distance k between two adjacent electrical connectors 20, namely 8150×log 10 (S)+16000≤k≤14100×log 10 (S)+34200, so that Topcon batteries can operate over a wide power range.

[0057] Based on the selection range of the cross-sectional area of ​​the electrical connector 20, and based on the calculation formula that the cross-sectional area S of the electrical connector 20 and the distance k between two adjacent electrical connectors 20 satisfy, the range of the distance k between two adjacent electrical connectors 20 of the Topcon battery can be limited.

[0058] Furthermore, based on the width W of the entire Topcon battery in the second direction and the distance k between two adjacent electrical connectors 20, the calculation formula W / (m+1)=k is used, where m is the number of electrical connectors 20. When a specific Topcon battery is selected, the width W of the Topcon battery in the second direction is a fixed value. Then, based on the range of the distance k between two adjacent electrical connectors 20, the range of the number of electrical connectors 20 required for the Topcon battery can be limited. Thus, based on the range of the number of electrical connectors 20, the number of electrical connectors 20 that need to be set can be selected, allowing the Topcon battery to operate within a larger power range.

[0059] The Topcon battery can determine the number of electrical connectors 20 that need to be installed based on the cross-sectional area of ​​the electrical connector 20 and the spacing between two adjacent electrical connectors 20.

[0060] For example, the power range is selected as 585W for the minimum power and 606W for the Topcon battery. The electrical connector 20 is the solder strip. A linear equation is established based on the theoretical basis that matching the cross-sectional area of ​​the solder strip with the spacing between adjacent main solder strips corresponds to the same power. The minimum power of 585W is defined as a high-power module. The maximum power of 606W is based on the fact that when the minimum number of solder strips—16—is selected for the Topcon battery, the maximum power does not exceed 606W after power calculations using different solder strip diameter combinations. To make the formula universally applicable to various adjacent solder strip spacings and numbers of solder strips, the maximum power is defined as 606W.

[0061] By selecting the cross-sectional area S of multiple electrical connectors 20 that meet the minimum power requirement of 585W and the spacing k between two adjacent electrical connectors 20, it can be concluded that the cross-sectional area S of the electrical connector 20 after taking the logarithm has a certain linear relationship with the spacing k between two adjacent electrical connectors 20, satisfying K=8150×log 10 (S)+16000.

[0062] By selecting the cross-sectional area S of multiple electrical connectors 20 that meet the maximum power of 606W and the spacing k between two adjacent electrical connectors 20, it can be concluded that the cross-sectional area S of the electrical connector 20 after taking the logarithm has a certain linear relationship with the spacing k between two adjacent electrical connectors 20, satisfying K=14100×log 10 (S)+34200.

[0063] Therefore, when the cross-sectional area of ​​the selected electrical connector 20 is S, the minimum distance between two adjacent electrical connectors 20 is 8150 × log 10 (S)+16000, the maximum distance between two adjacent electrical connectors 20 is 14100×log 10 (S)+34200, thus, the Topcon battery can operate in the power range of 585W to 606W, which is a large power.

[0064] Then, based on the maximum and minimum values ​​of the spacing between adjacent electrical connectors 20, the range of values ​​for the number of electrical connectors 20 can be calculated, and a specific number of electrical connectors 20 can be selected within the range of values ​​for the number of electrical connectors 20.

[0065] According to some embodiments of the present invention, k satisfies the relationship: 2250um≤k≤13120um.

[0066] If the distance k between two adjacent electrical connectors 20 is less than 2250 μm, the light-receiving area will be reduced, which will decrease the photoelectric conversion efficiency of the photovoltaic module 200. Therefore, the distance k between two adjacent electrical connectors 20 is set to be no less than 2250 μm.

[0067] If the spacing k between two adjacent electrical connectors 20 is greater than 13120µm, the current transmission path from the sub-gate line to the electrical connector 20 will be longer, which will also increase resistance loss and reduce current transmission efficiency. Therefore, the spacing k between two adjacent electrical connectors 20 is set to be no greater than 13120µm.

[0068] Where k satisfies the relationship: 2250um≤k≤13120um. When the spacing k between two adjacent electrical connectors 20 is selected as 7000um, not only can the light-receiving area of ​​the photovoltaic module 200 be increased, but the transmission path of current from the sub-grid to the electrical connector 20 can also be reduced, thereby reducing resistance loss and improving current transmission efficiency.

[0069] Alternatively, k satisfies the relationship: 3000um≤k≤12000um. When the spacing k between two adjacent electrical connectors 20 is set to 3000um, the current transmission path from the sub-gate to the electrical connector 20 can be further reduced, thereby further improving the current transmission efficiency.

[0070] When the spacing k between two adjacent electrical connectors 20 is set to 12000um, the light-receiving area of ​​the photovoltaic module 200 can be further increased, thereby further improving the photoelectric conversion efficiency of the photovoltaic module 200.

[0071] According to some embodiments of the present invention, the number of electrical connectors 20 is 16-80.

[0072] For Topcon182 and Topcon210 gridless batteries, when the number of electrical connectors 20 is selected in the range of 16-80, this number of electrical connectors 20 can balance the mutual influence between the resistance value and the light-shielding area of ​​the electrical connectors 20.

[0073] If the number of electrical connectors 20 is less than 16, each electrical connector 20 will need to carry more current, resulting in resistance loss in the current path and reducing current collection efficiency. Therefore, the number of electrical connectors 20 should be no less than 16.

[0074] If the number of electrical connections 20 exceeds 80, it will occupy more surface space of the photovoltaic module 200, reducing the effective light-receiving area and increasing shading losses. Furthermore, more electrical connections 20 mean the use of more metal materials (such as silver and copper), leading to increased material costs. Therefore, the number of electrical connections 20 should not exceed 80.

[0075] The number of electrical connectors 20 is 16-80. When the number of electrical connectors 20 is 16, it can not only reduce the resistance loss in the current path, but also increase the illumination area, thereby improving the power generation efficiency of the photovoltaic module 200 and reducing the cost.

[0076] Alternatively, the number of electrical connectors 20 can be 18-24. When the number of electrical connectors 20 is set to 18, the mutual influence between the resistance value and the light-shielding area of ​​the electrical connectors 20 can be further reduced.

[0077] When the number of electrical connectors 20 is set to 24, the resistance loss and the light-shielding area can be further reduced.

[0078] Furthermore, the length and width of the Topcon battery cells can be different or the same. For example, the width W and length of the Topcon battery cells can both be set to 182mm, or the width W of the Topcon battery cells can be set to 182.2mm and the length to 191.6mm, or the width W of the Topcon battery cells can be set to 182mm and the length to 210mm, or both the width W and length of the Topcon battery cells can be set to 210mm.

[0079] Example 1: Topcon182 gridless battery was selected; Electrical connector 20 is a welding strip, taking a round welding strip as an example; Welding strip diameter: 0.12mm-0.24mm; Cell length: 182mm, cell width: 182mm; Number of solar cells: 144; Number of solder strips on the front side of the solar cell: 16-80; Number of solder strips on the back side of the solar cell: 16-80; Table 1. Relationship between extreme and actual values ​​of the spacing between adjacent solder strips of Topcon182 solar cells and the cross-sectional area of ​​the solder strips:

[0080] The Topcon182 solar cell uses solder strips with diameters ranging from 0.12mm to 0.24mm, corresponding to a cross-sectional area of ​​0.011mm². 2 -0.045mm 2 The corresponding calculation formula is 8150 × log 10 (S)+16000≤k≤14100×log 10 (S)+34200 yields the maximum and minimum values ​​of the solder strip spacing. Based on these values, the range of possible solder strip numbers can be calculated. Within this range, a specific number of solder strips can be selected, ranging from 16 to 80. Furthermore, the actual spacing between any two adjacent solder strips falls within the range of the maximum and minimum solder strip spacing values. This demonstrates the validity of the calculation formula 8150×log 10 (S)+16000≤k≤14100×log 10 (S)+34200 is for Topcon182 batteries.

[0081] Example 2: Topcon210 gridless battery was selected; Electrical connector 20 is a welding strip, taking a round welding strip as an example; Welding strip diameter: 0.12mm-0.24mm; Cell length: 210mm, cell width: 210mm; Number of solar cells: 132; Number of solder strips on the front side of the solar cell: 18-80; Number of solder strips on the back side of the solar cell: 18-80. Table 2. Relationship between extreme and actual values ​​of the spacing between adjacent solder strips of Topcon210 solar cells and the cross-sectional area of ​​the solder strips:

[0082] The Topcon210 solar cell uses solder strips with a diameter of 0.12mm-0.24mm, and the corresponding cross-sectional area of ​​the solder strip ranges from 0.011mm². 2 -0.045mm 2 The corresponding calculation formula is 8150 × log 10 (S)+16000≤k≤14100×log 10 (S)+34200 yields the maximum and minimum values ​​of the solder strip spacing. Based on these values, the range of possible solder strip numbers can be calculated. Within this range, a specific number of solder strips can be selected, ranging from 18 to 80. Furthermore, the actual spacing between any two adjacent solder strips falls within the range of the maximum and minimum solder strip spacing values. This demonstrates the validity of the calculation formula 8150×log 10 (S)+16000≤k≤14100×log 10 (S)+34200 is for Topcon210 batteries.

[0083] According to some embodiments of the present invention, both the first battery 10 and the second battery 12 are BC batteries, and S satisfies the relationship: 0.02mm 2 ≤S≤0.2mm 2 Among them, BC batteries, or back contact batteries, have solder strips on the back of the battery. Increasing their diameter will not affect light shielding. A larger diameter will reduce resistance. Therefore, the lower limit of the diameter must be greater than that of TopCon batteries.

[0084] If the cross-sectional area of ​​electrical connector 20 is less than 0.02 mm² 2 The reduced current carrying capacity of the electrical connector 20 leads to a further increase in resistance. Furthermore, for high-power photovoltaic modules 200 approaching or exceeding 600W, a smaller cross-sectional area S increases energy loss during current transmission. Therefore, the cross-sectional area of ​​the electrical connector 20 should be no less than 0.02 mm². 2 .

[0085] When the cross-sectional area S of the electrical connector 20 is greater than 0.2 mm² 2This would occupy a larger surface area, thus reducing the effective light-receiving area and lowering its power generation capacity. Therefore, the cross-sectional area S of the electrical connector 20 should not exceed 0.2 mm². 2 .

[0086] When the cross-sectional area S of the electrical connector 20 is 0.1mm² 2 In this way, not only can the resistance be reduced and a larger current can be carried, but the cost can also be reduced.

[0087] Alternatively, the cross-sectional area S of the electrical connector 20 may satisfy 0.02 mm². 2 ≤S≤0.12mm 2 .

[0088] The cross-sectional area S of the electrical connector 20 can be set to 0.02 mm. 2 This increases the number of solder strips, increases the current collection capacity, and increases the number of solder strips connected in parallel, which can further reduce resistance.

[0089] Furthermore, the cross-sectional area S of the electrical connector 20 can be set to 0.12 mm. 2 This allows BC batteries to have a larger cross-sectional area, which can significantly reduce resistance and thus reduce energy loss during current transmission.

[0090] According to some embodiments of the present invention, the distance between two adjacent electrical connectors 20 is k, and k and S satisfy the relationship: 7200 × log 10 (S)+13000≤k≤11600×log 10 (S)+29100, where k is in units of um.

[0091] Among them, the cross-sectional area S of the electrical connector 20 is in the range of 0.016 mm. 2 ≤S≤0.2 mm 2 The data is selected from the range of 2250um-13120um for the distance k between two adjacent electrical connectors 20, and the cross-sectional area S of multiple different electrical connectors 20 that are close to or above 600W and the corresponding distance k between two adjacent electrical connectors 20 are selected.

[0092] When selecting the cross-sectional area S of multiple electrical connectors 20 approaching 600W and the spacing k between two adjacent electrical connectors 20, the resulting scatter plot exhibits a logarithmic distribution. The cross-sectional areas of the selected electrical connectors 20 are all taken as logarithms with base 10. Then, linear fitting is performed on the data of the logarithms of the selected electrical connectors 20 and the spacing k in Excel. By creating a scatter plot and adding a linear trend line in Excel, and then displaying the formula option, the linear regression equation, K = 11600 × log0, can be displayed on the chart. 10 (S)+29100, with Log as the independent variable. 10 (S), the dependent variable is the distance K between two adjacent electrical connectors 20.

[0093] When selecting multiple different cross-sectional areas S of electrical connectors 20 with a power rating of 600W or higher, and the corresponding distance k between two adjacent electrical connectors 20, the resulting scatter plot exhibits a logarithmic distribution. Therefore, the cross-sectional areas of the selected electrical connectors 20 are all taken as logarithms with base 10. Then, linear fitting is performed on the data of the logarithms of the selected electrical connectors 20 cross-sectional areas with base 10 and the distance k between two adjacent electrical connectors 20 in Excel. By creating a scatter plot and adding a linear trend line in Excel, and then using the formula option, the linear regression equation can be displayed on the chart: K = 7200 × log 10 (S)+13000, with Log as the independent variable. 10 (S), with the dependent variable being the distance K between adjacent weld strips.

[0094] Thus, it can be concluded that the cross-sectional area S of the electrical connector 20 after taking the logarithm has a certain linear relationship with the distance k between two adjacent electrical connectors 20, namely 7200×log 10 (S)+13000≤k≤11600×log 10 (S)+29100.

[0095] For example, a power range of 585W to 606W is selected for the BC battery, with the electrical connector 20 representing the solder strip. A linear equation is established based on the theoretical principle that matching the cross-sectional area of ​​the solder strip with the spacing between adjacent main solder strips corresponds to the same power. The minimum power of 585W is defined as a high-power module. The maximum power of 606W is based on the fact that when the minimum number of solder strips for the BC battery is selected—20—power calculations using different solder strip diameter combinations result in a maximum power close to 606W. To make the formula universally applicable to various adjacent solder strip spacings and numbers of solder strips, the maximum power is defined as 606W.

[0096] By selecting the cross-sectional area S of multiple electrical connectors 20 that meet the minimum power requirement of 585W and the spacing k between two adjacent electrical connectors 20, it can be concluded that the cross-sectional area S of the electrical connector 20 after taking the logarithm has a certain linear relationship with the spacing k between two adjacent electrical connectors 20, satisfying K=7200×log 10 (S)+13000.

[0097] By selecting data on the cross-sectional area S of multiple electrical connectors 20 that meet a maximum power of approximately 606W and the spacing k between two adjacent electrical connectors 20, it can be concluded that the logarithmic cross-sectional area S of the electrical connector 20 and the spacing k between two adjacent electrical connectors 20 have a certain linear relationship, satisfying K=11600×log 10 (S)+29100.

[0098] When the cross-sectional area of ​​the selected electrical connector 20 is S, the minimum distance between two adjacent electrical connectors 20 is 7200 × log 10 (S)+13000, the maximum distance between two adjacent electrical connectors 20 is 11600×log 10 (S)+29100. In this way, the power of the BC battery can be satisfied within the range of 585W to 606W, which is a large power.

[0099] Then, based on the maximum and minimum values ​​of the spacing between adjacent electrical connectors 20, the range of values ​​for the number of electrical connectors 20 can be calculated, and a specific number of electrical connectors 20 can be selected within the range of values ​​for the number of electrical connectors 20.

[0100] According to some embodiments of the present invention, k satisfies the relationship: 2250um≤k≤13120um.

[0101] If the distance k between two adjacent electrical connectors 20 is less than 2250 μm, the light-receiving area will be reduced, which will decrease the photoelectric conversion efficiency of the photovoltaic module 200. Therefore, the distance k between two adjacent electrical connectors 20 is set to be no less than 2250 μm.

[0102] If the spacing k between two adjacent electrical connectors 20 is greater than 13120µm, the current transmission path from the sub-gate to the electrical connector 20 will be longer, which will also increase resistance loss and reduce current transmission efficiency. Therefore, the spacing k between two adjacent electrical connectors 20 is set to be no greater than 13120µm.

[0103] Wherein, k satisfies the relationship: 2250um≤k≤13120um. When the spacing k between two adjacent electrical connectors 20 is selected as 6000um, not only can the light-receiving area of ​​the photovoltaic module 200 be increased, but the transmission path of current from the sub-grid to the electrical connector 20 will also be reduced, thereby reducing resistance loss and improving current transmission efficiency.

[0104] Alternatively, k satisfies the relationship: 4000um≤k≤9000um. When the spacing k between two adjacent electrical connectors 20 is set to 4000um, the current transmission path from the sub-gate to the electrical connector 20 can be further reduced, thereby further improving the current transmission efficiency.

[0105] When the spacing k between two adjacent electrical connectors 20 is set to 9000um, the light-receiving area of ​​the photovoltaic module 200 can be further increased, thereby further improving the photoelectric conversion efficiency of the photovoltaic module 200.

[0106] According to some embodiments of the present invention, the number of electrical connectors 20 is 20-80.

[0107] For the BC182 and BC210 gridless cells, the positive and negative electrodes are on one side. A minimum of 10 positive and negative electrodes correspond to 20 electrical connectors. Since solder ribbons are welded on the grid lines of both positive and negative electrodes, there are 20 solder ribbons for 10 positive electrodes and 10 negative electrodes. A minimum of 10 is required to reduce the resistance of the current on the surface of the cell and to reduce the resistance of the solder ribbons. The resistance of the solder ribbons needs to be calculated in parallel. If the number of electrodes is less than 10, the resistance will be too high.

[0108] If the number of electrical connectors 20 is less than 20, each of the 20 electrical connectors 20 will need to carry more current, resulting in resistance loss in the current path and reducing current collection efficiency. Therefore, the number of electrical connectors 20 should be no less than 20.

[0109] The number of positive and negative electrodes generally does not exceed 40. These 40 electrodes correspond to 80 electrical connectors 20, therefore, 80 electrical connectors 20 are not used. If the number of electrical connectors 20 exceeds 80, it would occupy more surface space of the photovoltaic module 200, reducing the effective light-receiving area and increasing shading losses. Furthermore, more electrical connectors 20 mean the use of more metal materials (such as silver and copper), leading to increased material costs. Therefore, the number of electrical connectors 20 is no more than 80.

[0110] The number of electrical connectors 20 is 20-80. When the number of electrical connectors 20 is 22, it can not only reduce the resistance loss in the current path, but also increase the illumination area, thereby improving the power generation efficiency of the photovoltaic module 200.

[0111] Alternatively, the number of electrical connectors 20 can be 24-36. When the number of electrical connectors 20 is set to 24, the illumination area can be further increased, thereby further improving the power generation efficiency of the photovoltaic module 200.

[0112] When the number of electrical connectors 20 is set to 36, the current transmission path from the sub-gate to the electrical connectors 20 can be further shortened, reducing resistance loss and thus further improving current collection efficiency.

[0113] The length and width of the BC battery cells can be the same or different. For example, the width W and length of the BC battery cells can both be set to 182mm, or the width W of the BC battery cells can be set to 182.2mm and the length to 191.6mm, or the width W of the BC battery cells can be set to 182mm and the length to 210mm, or both the width W and length of the BC battery cells can be set to 210mm.

[0114] Example 3: BC182 gridless cell was selected; Electrical connector 20 is a welding strip, taking a round welding strip as an example; Welding strip diameter: 0.16mm-0.32mm; Cell length: 182mm, cell width: 182mm; Number of half-cell solar cells: 144; Number of solder strips on the back of the solar cell: 24-80; Table 3. Relationship between extreme and actual values ​​of the spacing between adjacent solder strips of BC182 solar cells and the cross-sectional area of ​​the solder strips:

[0115] The diameter of the solder strip used with the BC182 solar cell ranges from 0.16mm to 0.32mm, and the corresponding cross-sectional area of ​​the solder strip ranges from 0.02mm². 2-0.08mm 2 The corresponding calculation formula is 7200×log 10 (S)+13000≤k≤11600×log 10 (S)+29100 yields the maximum and minimum values ​​of the solder strip spacing. Based on these values, the range of possible solder strip numbers can be calculated. Within this range, a specific number of solder strips can be selected, ranging from 20 to 80. Furthermore, the actual spacing between any two adjacent solder strips falls within the range of the maximum and minimum solder strip spacing values. This demonstrates the validity of the calculation formula 7200×log 10 (S)+13000≤k≤11600×log 10 (S)+29100 is suitable for BC182 batteries.

[0116] Example 4: BC210 gridless cell was selected; Electrical connector 20 is a welding strip, taking a round welding strip as an example; Welding strip diameter: 0.18mm-0.32mm; Cell length: 210mm, cell width: 210mm; Number of solar cells: 132; Number of solder strips on the back of the solar cell: 24-80; Table 4. Relationship between extreme and actual values ​​of the spacing between adjacent solder strips of BC210 solar cells and the cross-sectional area of ​​the solder strips:

[0117] The diameter of the solder strip used with the BC210 solar cell ranges from 0.18mm to 0.32mm, and the corresponding cross-sectional area of ​​the solder strip ranges from 0.025mm². 2 -0.08mm 2 The corresponding calculation formula is 7200×log 10 (S)+13000≤k≤11600×log 10 (S)+29100 yields the maximum and minimum values ​​of the solder strip spacing. Based on these values, the range of possible solder strip numbers can be calculated. Within this range, a specific number of solder strips can be selected, ranging from 24 to 80. Furthermore, the actual spacing between any two adjacent solder strips falls within the range of the maximum and minimum solder strip spacing values. This demonstrates the validity of the calculation formula 7200×log 10 (S)+13000≤k≤11600×log 10 (S)+29100 is suitable for BC210 batteries.

[0118] According to some embodiments of the present invention, both the first battery 10 and the second battery 12 are Topcon stacked grid batteries, and S satisfies the relationship: 0.003mm 2 ≤S≤0.05mm 2 Among them, stacked grid cells generally use small-diameter solder strips, mainly to reduce the impact of shading.

[0119] If the cross-sectional area of ​​electrical connector 20 is less than 0.003 mm² 2 The reduced current capacity of the electrical connector 20 leads to a further increase in resistance. Furthermore, for photovoltaic modules 200 with a minimum power of 600W or higher, a smaller cross-sectional area S increases energy loss during current transmission. Therefore, the cross-sectional area of ​​the electrical connector 20 should be no less than 0.003 mm². 2 .

[0120] When the cross-sectional area S of the electrical connector 20 is greater than 0.05 mm² 2 This would occupy a larger surface area, thus reducing the effective light-receiving area and lowering its power generation capacity. Therefore, the cross-sectional area S of the electrical connector 20 should not exceed 0.05 mm². 2 .

[0121] When the cross-sectional area S of the electrical connector 20 is 0.005mm² 2 In this way, not only can the power consumption be reduced, but the current can also be carried, and the cost can also be reduced.

[0122] Alternatively, the cross-sectional area S of the electrical connector 20 may satisfy 0.003 mm². 2 ≤S≤0.01mm 2 .

[0123] The cross-sectional area S of the electrical connector 20 can be set to 0.003 mm². 2 This allows Topcon stacked grid cells to use a smaller cross-sectional area, which can reduce the impact of shading.

[0124] Furthermore, the cross-sectional area S of the electrical connector 20 can be set to 0.01 mm. 2 This allows Topcon stacked grid cells to use a larger cross-sectional area, which can not only significantly reduce resistance but also reduce the impact of shading.

[0125] According to some embodiments of the present invention, the distance between two adjacent electrical connectors 20 is k, and k satisfies the relationship with S: 1674.5 × log 10 (S) + 4918.8 ≤ k ≤ 2404.1 × log 10 (S)+7992.7.

[0126] Specifically, the cross-sectional area S of the electrical connector 20 satisfies the relationship 0.003mm. 2 ≤S≤0.05mm 2 The data were selected from the range of 560um-2250um for the distance k between two adjacent electrical connectors 20. For example, as shown in Table 5, data on the cross-sectional area S of several different electrical connectors 20 that meet the requirements of a minimum power of 600W or above, and the corresponding distance k between two adjacent electrical connectors 20 were selected.

[0127] When selecting the cross-sectional area S of multiple electrical connectors 20 with a minimum power of 600W and the spacing k between their adjacent components, as shown in Table 6, the scatter plot formed by the selected cross-sectional areas S and spacing k exhibits a logarithmic distribution. Taking the logarithm of the selected cross-sectional areas S to the base 10, as shown in Table 7, allows for a linear relationship between the logarithm of the selected cross-sectional areas S to the base 10 and the spacing k between their adjacent components. This data is then linearly fitted in Excel. By creating a scatter plot and adding a linear trend line in Excel, and then displaying the formula option, the linear regression equation, K = 2404.1 × log0, can be displayed on the chart. 10 (S)+7992.7, coefficient of determination R 2 The value is 0.9674, and the independent variable is Log. 10 (S), the dependent variable is the distance k between two adjacent electrical connectors 20.

[0128] When selecting multiple different cross-sectional areas S of electrical connectors 20 with a power rating of 600W or higher, and the spacing k between two adjacent electrical connectors 20, as shown in Table 8, the scatter plot formed by the selected cross-sectional areas S of the multiple different electrical connectors 20 and the spacing k between two adjacent electrical connectors 20 exhibits a logarithmic distribution. Taking the logarithm of each of the selected different solder strip cross-sectional areas to the base 10, as shown in Table 9, and then performing linear fitting on the data of the logarithm of each of the selected different solder strip cross-sectional areas to the base 10 and the spacing k between two adjacent electrical connectors 20 in Excel, a scatter plot and a linear trend line are created in Excel. Then, by using the formula display option, the linear regression equation can be displayed on the chart, i.e., K = 1674.5 × log 10(S)+4918.8, coefficient of determination R 2 The value is 0.9853, and the independent variable is Log. 10 (S), with the dependent variable being the distance K between adjacent weld strips.

[0129] Thus, it can be concluded that the cross-sectional area S of the electrical connector 20 after taking the logarithm has a certain linear relationship with the distance k between two adjacent electrical connectors 20, namely 1674.5 × log 10 (S) + 4918.8 ≤ k ≤ 2404.1 × log 10 (S)+7992.7.

[0130] For example, a power range of 600W for the minimum power of the stacked cell and 626W for the maximum power is selected. Electrical connector 20 is the solder strip. A linear equation is established based on the theoretical basis that the cross-sectional area of ​​the solder strip matches the spacing between adjacent main solder strips, corresponding to the same power. The minimum power of 600W is selected because the stacked module is defined as a high-power module. The maximum power of 626W is based on the fact that when the Topcon182 cell uses the minimum number of solder strips—80—after power calculations using different combinations of solder strips with different side lengths, the maximum power does not exceed 626W. To make the formula universally applicable to various adjacent solder strip spacings and numbers of solder strips, the maximum power is defined as 626W. The selected data is shown in Table 5. When the cross-sectional area of ​​the selected electrical connector 20 is S, the minimum distance between two adjacent electrical connectors 20 is 1674.5 × log 10 (S)+4918.8, the maximum distance between two adjacent electrical connectors 20 is 2404.1×log 10 (S)+7992.7. In this way, the power of the Topcon182 stacked grid cell can be satisfied within the range of 600W to 626W, which is a large power.

[0131] Then, based on the maximum and minimum values ​​of the spacing between adjacent electrical connectors 20, the range of values ​​for the number of electrical connectors 20 can be calculated, and a specific number of electrical connectors 20 can be selected within the range of values ​​for the number of electrical connectors 20.

[0132] Table 5 shows the different solder strip cross-sectional areas and their corresponding adjacent solder strip spacings in Topcon stacked cells to meet different power requirements.

[0133]

[0134]

[0135]

[0136]

[0137]

[0138] Calculation of the maximum spacing between adjacent solder strips: Table 6 shows the data for six different adjacent solder strip distances and corresponding solder strip cross-sectional areas, selected from Table 5, with a minimum power of 600W and close to 600W: Table 6. Six different weld strip cross-sectional areas and their corresponding adjacent weld strip spacings.

[0139] The cross-sectional area of ​​the weld strip in each of the six groups was taken as the logarithm to the base 10, and the data obtained are shown in Table 7: Table 7 shows the different cross-sectional areas of the weld strips after taking the logarithm for six groups, and their corresponding spacing between adjacent weld strips.

[0140] Calculation of the minimum spacing between adjacent solder strips: Table 8 shows the data for twelve different adjacent solder strip distances and corresponding solder strip cross-sectional areas, with a power of approximately 626W selected from Table 5. Table 8. Twelve different weld strip cross-sectional areas and their corresponding adjacent weld strip spacings

[0141] The cross-sectional area of ​​the weld strip in each of the twelve groups was taken as the logarithm to the base 10, and the data are shown in Table 9: Table 9. Different weld strip cross-sectional areas after taking the logarithm of twelve groups and their corresponding adjacent weld strip spacings.

[0142] According to some embodiments of the present invention, k satisfies the relationship: 560um≤k≤2250um.

[0143] If the distance k between two adjacent electrical connectors 20 is less than 560µm, the light-receiving area will be reduced, which will decrease the photoelectric conversion efficiency of the photovoltaic module 200. Therefore, the distance k between two adjacent electrical connectors 20 is set to be no less than 560µm.

[0144] If the spacing k between two adjacent electrical connectors 20 is greater than 2250µm, the current transmission path from the sub-gate to the electrical connector 20 will be longer, which will also increase resistance loss and reduce current transmission efficiency. Therefore, the spacing k between two adjacent electrical connectors 20 is set to be no greater than 2250µm.

[0145] Where k satisfies the relationship: 560um≤k≤2250um. When the spacing k between two adjacent electrical connectors 20 is selected as 1130um, not only can the light-receiving area of ​​the photovoltaic module 200 be increased, but the transmission path of current from the sub-grid to the electrical connector 20 can also be reduced, thereby reducing resistance loss and improving current transmission efficiency.

[0146] Alternatively, k satisfies the relationship: 697um≤k≤2247um. When the spacing k between two adjacent electrical connectors 20 is set to 697um, the current transmission path from the sub-gate to the electrical connector 20 can be further reduced, thereby further improving the current transmission efficiency.

[0147] When the spacing k between two adjacent electrical connectors 20 is set to 2247um, the light-receiving area of ​​the photovoltaic module 200 can be further increased, thereby further improving the photoelectric conversion efficiency of the photovoltaic module 200.

[0148] According to some embodiments of the present invention, the number of electrical connectors 20 is 80-320.

[0149] In the case of stacked grid cells, since the sub-grids are located below the electrical connectors 20, the number of electrical connectors 20 is set to range from 80 to 320, which can meet the requirements for electronic transmission.

[0150] If the number of electrical connectors 20 is less than 80, each of the 80 electrical connectors 20 will need to carry more current, resulting in resistance loss in the current path and reducing current collection efficiency. Therefore, the number of electrical connectors 20 should be no less than 80.

[0151] If the number of electrical connections 20 exceeds 320, it will occupy more surface space of the photovoltaic module 200, reducing the effective light-receiving area and increasing shading losses. Furthermore, more electrical connections 20 mean the use of more metal materials (such as silver and copper), leading to increased material costs. Therefore, the number of electrical connections 20 should not exceed 320.

[0152] The number of electrical connectors 20 ranges from 80 to 320. When the number of electrical connectors 20 is 120, it can not only reduce the resistance loss in the current path, but also increase the illumination area, thereby improving the power generation efficiency of the photovoltaic module 200.

[0153] Alternatively, the number of electrical connectors 20 can be 140-260. When the number of electrical connectors 20 is set to 140, the illumination area can be further increased, thereby further improving the power generation efficiency of the photovoltaic module 200.

[0154] When the number of electrical connectors 20 is set to 260, the current transmission path from the sub-gate to the electrical connectors 20 can be further shortened, reducing resistance loss and thus further improving current collection efficiency.

[0155] According to some embodiments of the present invention, the cross-section of the electrical connector 20 is an equilateral triangle.

[0156] Among them, the cross-section of the electrical connector 20 on the front of the battery is an equilateral triangle. Compared with the cross-section of the electrical connector being circular or other traditional shapes, the equilateral triangle cross-section of the electrical connector 20 can provide higher bending strength and torsional strength with the same amount of material, and can also reduce light shading, thereby improving the efficiency of light reception.

[0157] Example 5: Topcon182 stacked grid battery was selected; Electrical connector 20 is a welding strip with a side length of 0.073mm-0.150mm; the cross-section of the welding strip is an equilateral triangle. Cell length: 182mm, cell width: 182mm; Number of solar cells: 144; Number of solder strips on the back of the solar cell: 80-320; Table 10 Relationship between extreme and actual values ​​of adjacent solder strip spacing and solder strip cross-sectional area for 182-cell stacked solar cells:

[0158] The Topcon182 stacked-grid battery string uses equilateral triangular solder strips with side lengths ranging from 0.073mm to 0.148mm. The cross-sectional area of ​​the equilateral triangular solder strips is... Here, the cross-sectional area is S, and a is the side length of the equilateral triangle solder strip. The reason for matching the side length of the solder strip with the number of solder strips is to make the total cross-sectional area of ​​the stacked grid solder strips close to that of the total cross-sectional area of ​​the solder strips in a regular Topcon182 module, so that the total volume of the solder strips remains unchanged and the price difference is not significant. Accordingly, the cross-sectional area of ​​a single solder strip ranges from 0.002 mm. 2 -0.0095mm 2 The corresponding calculation formula is: 1674.5×log 10 (S) + 4918.8 ≤ k ≤ 2404.1 × log 10(S)+7992.7, where S is the cross-sectional area of ​​the solder strip and k is the spacing between adjacent solder strips. Based on the cross-sectional area S, the maximum and minimum values ​​of the solder strip spacing can be obtained. Based on these maximum and minimum values, the range of possible solder strip numbers can be calculated. Within this range, a specific number of solder strips can be selected, ranging from 80 to 320. At this point, the actual spacing between any two adjacent solder strips in the battery string is within the range of the maximum and minimum solder strip spacing values, thus demonstrating the validity of the calculation formula 1674.5×log 10 (S) + 4918.8 ≤ k ≤ 2404.1 × log 10 (S)+7992.7 is applicable to Topcon182 stacked grid cells.

[0159] According to some embodiments of the present invention, the first battery 10 is provided with a plurality of first sub-grid lines 11, which are spaced apart in a first direction and extend in a second direction; the second battery 12 is provided with a plurality of second sub-grid lines 121, which are spaced apart in a first direction and extend in a second direction; wherein a plurality of electrical connectors 20 are respectively connected to and intersected with the plurality of first sub-grid lines 11 and the plurality of second sub-grid lines 121.

[0160] The multiple first sub-grid lines 11 are spaced apart in the first direction to ensure that the current is evenly distributed within the photovoltaic module 200, which is especially important for high-power applications as it can reduce current concentration.

[0161] Furthermore, the arrangement of multiple first sub-grid lines 11 can share the current load, reduce the resistance of individual solder joints or connections, lower the overall resistance, and reduce energy loss.

[0162] Similarly, the multiple second grid lines 121 are spaced apart in the first direction to ensure that the current is evenly distributed within the photovoltaic module 200, which is especially important for high-power applications as it can reduce current concentration.

[0163] Furthermore, multiple electrical connectors 20 are respectively connected to multiple first sub-grid lines 11 and multiple second sub-grid lines 121. The electrical connectors 20 can achieve a balanced distribution of current among different sub-grid lines, which can ensure a balanced current load in each part of the photovoltaic module 200.

[0164] Furthermore, the multiple electrical connectors 20 are arranged to cross with the multiple first sub-grid lines 11 and the multiple second sub-grid lines 121 respectively, which can ensure that the current is evenly collected from the multiple first sub-grid lines 11 and the multiple second sub-grid lines 121 onto the electrical connectors 20, which can avoid local current overload and thus further improve the current collection efficiency.

[0165] According to some embodiments of the present invention, such as Figure 5 As shown, the first battery 10 is provided with a plurality of third sub-grid lines, which extend in a first direction and are spaced apart in a second direction. The second battery 12 is provided with a plurality of fourth sub-grid lines, which extend in a first direction and are spaced apart in a second direction.

[0166] Specifically, when both the first cell 10 and the second cell 12 are Topcon stacked cells, multiple third sub-grid lines are spaced apart in the second direction, and multiple fourth sub-grid lines are spaced apart in the second direction, thereby ensuring that the current is evenly distributed within the photovoltaic module 200.

[0167] In this configuration, multiple electrical connectors 20 are connected one-to-one with multiple third sub-grid lines, and the electrical connectors 20 and the third sub-grid lines are arranged to overlap. Multiple electrical connectors 20 are also connected one-to-one with multiple fourth sub-grid lines, and the electrical connectors 20 and the fourth sub-grid lines are arranged to overlap. This further simplifies the current collection path, thereby further reducing resistance and silver consumption.

[0168] According to some embodiments of the present invention, the photovoltaic module 200 further includes: a front glass 40, a back sheet 70, and an encapsulating film 60. The front glass 40 is located on the front side of the first battery 10 and the second battery 12, the back sheet 70 is located on the back side of the first battery 10 and the second battery 12, and the encapsulating film 60 is located between the front side of the first battery 10 and the second battery 12 and the front glass, and the encapsulating film is also located between the back side of the first battery 10 and the second battery 12 and the back sheet 70.

[0169] The front glass 40 allows sunlight to pass through and illuminate the first battery 10 and the second battery 12, facilitating power generation. A backplate 70 is located on the back of the first battery 10 and the second battery 12. The backplate 70 can be made of glass or an opaque material. Furthermore, an adhesive film 60 is located between the front of the first battery 10 and the second battery 12 and the front glass, thus ensuring a more secure connection between the front glass 40 and the front of the first battery 10 and the second battery 12. The adhesive film 60 is also located between the back of the first battery 10 and the second battery 12 and the backplate 70, further strengthening the connection between the back of the first battery 10 and the second battery 12 and the backplate 70.

[0170] According to some embodiments of the present invention, such as Figure 2As shown, the photovoltaic module 200 also includes: a light guide plate 50, one side of which is connected to the front glass 40, and the other side of which is connected to the encapsulant film 60. A reflective part is provided on the other side of the light guide plate 50. The reflective part is respectively disposed opposite to the first battery 10 and the second battery 12. The reflective part forms a plurality of rows of reflective units, and the surface of each reflective unit is a curved surface or an arc surface.

[0171] Specifically, one side of the light guide plate 50 is connected to the lower surface of the front glass 40. The light guide plate 50 can be a highly transparent plastic plate. Due to the refractive index of the plastic plate, light will be refracted, causing the direction of light propagation to change. Under certain conditions, this refraction phenomenon can cause light to be reflected and focused inside the plastic plate, thereby producing a certain degree of light-gathering effect.

[0172] Furthermore, a reflective part 51 is provided on the other side of the light guide plate 50. The reflective part 51 can reflect the light focused by the light guide plate 50 to the first battery 10 and the second battery 12, which can increase the intensity of light received by the photovoltaic module 200, thereby increasing the power generation of the photovoltaic module 200.

[0173] Furthermore, the reflective part 51 is formed with multiple reflective units arranged in rows, and the surface of each reflective unit is a curved surface or an arc surface.

[0174] Specifically, the reflector 51 is designed with multiple rows of reflective units, each typically having a curved or arc-shaped surface. This design facilitates effective light reflection and concentration, thereby improving the photoelectric conversion efficiency of the photovoltaic module 200. By employing a curved or arc-shaped surface design, the reflection angle and concentration effect of the light can be better controlled, allowing the light to be more concentrated on the photovoltaic module 200, thus improving the utilization rate of light energy.

[0175] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0176] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0177] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that, include: A first battery and a second battery are arranged at intervals in a first direction; Multiple electrical connectors are provided, which are respectively connected to the first battery and the second battery. The multiple electrical connectors extend in the first direction and are spaced apart in the second direction. The first direction and the second direction are perpendicular to each other. The cross-sectional area of ​​the electrical connector is S, and S satisfies the following relationship: 0.003 mm² 2 ≤S≤0.2mm 2 .

2. The photovoltaic module according to claim 1, characterized in that, Both the first and second batteries are Topcon batteries, and S satisfies the relationship: 0.011mm 2 ≤S≤0.125mm 2 .

3. The photovoltaic module according to claim 2, characterized in that, The distance between two adjacent electrical connectors is k, and k and S satisfy the following relationship: 8150×log 10 (S)+16000≤k≤14100×log 10 (S)+34200, where k is in um.

4. The photovoltaic module according to claim 3, characterized in that, k satisfies the relation: 2250um≤k≤13120um.

5. The photovoltaic module according to claim 2, characterized in that, The number of electrical connectors is 16-80.

6. The photovoltaic module according to claim 1, characterized in that, Both the first and second batteries are BC batteries, and S satisfies the relationship: 0.02mm 2 ≤S≤0.2mm 2 .

7. The photovoltaic module according to claim 6, characterized in that, The distance between two adjacent electrical connectors is k, and k and S satisfy the following relationship: 7200×log 10 (S)+13000≤k≤11600×log 10 (S)+29100, where k is in units of um.

8. The photovoltaic module according to claim 7, characterized in that, k satisfies the relation: 2250um≤k≤13120um.

9. The photovoltaic module according to claim 6, characterized in that, The number of electrical connectors is 20-80.

10. The photovoltaic module according to claim 1, characterized in that, Both the first and second cells are Topcon stacked cells, and S satisfies the relationship: 0.003mm 2 ≤S≤0.05mm 2 .

11. The photovoltaic module according to claim 10, characterized in that, The distance between two adjacent electrical connectors is k, and k and S satisfy the following relationship: 1674.5×log 10 (S) + 4918.8 ≤ k ≤ 2404.1 × log 10 (S)+7992.7, where k is in um.

12. The photovoltaic module according to claim 11, characterized in that, k satisfies the relation: 560um≤k≤2250um.

13. The photovoltaic module according to claim 10, characterized in that, The number of electrical connectors is 80-320.

14. The photovoltaic module according to claim 10, characterized in that, The cross-section of the electrical connector is an equilateral triangle.

15. The photovoltaic module according to claim 1, characterized in that, The first battery is provided with a plurality of first sub-grid lines, which are spaced apart in the first direction and extend in the second direction; The second battery is provided with a plurality of second sub-grid lines, which are spaced apart in the first direction and extend in the second direction; The plurality of electrical connectors are respectively connected to the plurality of first sub-gate lines and the plurality of second sub-gate lines and are arranged in a cross manner.

16. The photovoltaic module according to claim 1, characterized in that, The first battery is provided with a plurality of third sub-grid lines, which extend in the first direction and are spaced apart in the second direction; The second battery is provided with a plurality of fourth sub-grid lines, which extend in the first direction and are spaced apart in the second direction; The plurality of electrical connectors are connected to and overlapped with the plurality of third sub-gate lines in a one-to-one correspondence, and the plurality of electrical connectors are connected to and overlapped with the plurality of fourth sub-gate lines in a one-to-one correspondence.

17. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes: Front glass, the front glass being located on the front of the first battery and the second battery; A backplate, the backplate being located on the back of the first battery and the second battery; An adhesive film is located between the front side of the first battery and the second battery and the front glass, and the adhesive film is also located between the back side of the first battery and the second battery and the back plate.

18. The photovoltaic module according to claim 17, characterized in that, The photovoltaic module further includes: a light guide plate, one side of which is connected to the front glass, and the other side of which is connected to the adhesive film and has a reflective portion, the reflective portion being disposed opposite to the first battery and the second battery respectively; The reflective part is formed with multiple reflective units arranged in rows, and the surface of each reflective unit is a curved surface or an arc surface.

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